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Recent development in Mechanical Engineering

Recent development in Mechanical Engineering

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Recent developments in Mechanical Engineering encompass advancements in design, materials, manufacturing processes, and systems integration, driven by innovations in technology such as automation, robotics, and computational modeling. This field focuses on improving efficiency, sustainability, and functionality in mechanical systems across various applications, including aerospace, automotive, and energy sectors.
lightbulbAbout this topic
Recent developments in Mechanical Engineering encompass advancements in design, materials, manufacturing processes, and systems integration, driven by innovations in technology such as automation, robotics, and computational modeling. This field focuses on improving efficiency, sustainability, and functionality in mechanical systems across various applications, including aerospace, automotive, and energy sectors.
Effect of Mount Angle on Static and Dynamic Characteristics of Gas-Lubricated,Noncircular Journal Bearings
by reza rashidi

2025

In the case of noncircular journal bearings, as opposed to circular journal bearings, the orientation of bearing with respect to a given load direction can be a design parameter. This orientation may be defined in terms of an angle, which... more
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Design Improvisation of Electro-Mechanical Actuators for Operation at Sub Zero Temperatures
by Harshitha Nagaraj

2025, International Journal of Recent advances in Mechanical Engineering

Control surface actuators are the key systems in any flight vehicle for enabling a strict control on the flight parameters. The electromechanical actuator developed for an Unmanned aerial vehicle (UAV) is subjected to sub-zero... more
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Suspension System: Review About Components, Principal and Classification
by shailendra bohidar

2025

Vehicle suspension is used to achieve good driving stability and passenger comfort regardless of road surface. The suspension system of an automobile or a vehicle is the arrangement or a device which not provide the cushioning but also... more
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Experimental Study of Thermal Performance Enhancement of A Flat Plate Solar Air Heater Using Optical Measurement Technique
by Sunil Punjabi

2024, International Journal of Recent advances in Mechanical Engineering

Experimental test set up at laboratory scale was developed for thermal performance testing of flat plate solar air heater with artificial solar radiation intensity; 600W/m 2. A test cell of size 1m × 0.5m × 0.1m was fabricated. Three... more
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Thermal Performance Testing of a Flat Plate Solar Air Heater Using Optical Measurement Technique
by Sunil Punjabi

2024, International Journal of Recent advances in Mechanical Engineering

Experimental test set up at laboratory scale has been developed for thermal performance testing of flat plate solar air heater with simulated solar radiation intensity; 600W/m 2. A test cell of size 1m x 0.5m x 0.1m was fabricated. Three... more
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Investigation of Rotating Instability in the Last Stage of Low Pressure Turbine during Low volume flow Operation
by AJAY DHANOPIA

2024, International Journal of Recent advances in Mechanical Engineering

The rotating instability flow phenomenon is numerically studied earlier in the laststage of low pressure model steam turbine operated at very low mass flow rate. This kind of instability imposes a major risk to the mechanical integrity of... more
Such off design conditions may cause aero elastic problems mainly to the LSMBs and also putting them at a risk of damage due to windage .i.e. strongly separated flow. It has been observed that since a steam turbine may undergo variable part load operation for a considerable part of time, high dynamic stresses that are associated with the blade excitation must be avoided or at least controlled to be at below at certain level. Therefore it is necessary to investigate the flow behavior of LSMBs and corresponding aero elastic phenomena’s under low volume flow operations. This would directly help the designers in prediction of any mechanical failure and to reduce the risk. Thus this would play a major role in extending the working range and improving he flexibility of steam turbines [2].In past there were many different methods has been used to understand the unsteady aerodynamic flow phenomenon described. A computational study has beenperformed for measuring unsteady pressure measurements. International Journal of Recent advances in Mechanical Engineering (IJMECH) Vol.4, No.2, May 2015
Troyanovskii describes how the flow structure changes with reduction in span wise variation turbine at design conditions. Since the hub is a low reaction section so it is low volume flow. As the steam can no longer pass through the zone close to redirected towards experiment Lagune compressor. As we establishes itself at of reaction is 15% at the hub and 65% at the tip in the last s he tip and hence, a separation region develops behind the rotor he volume flow. The age of steam first to be affected by he root, it is blade. In his al also analyzed that under ventilation parts of the rotor blade operate as a 1 as the hub separation zone behind the rotor blade, another se even lower volumetric flows close to the casing in the axial paration zone gap between stator and rotor blade. This torus vortex moves in a circumferential direction with a considerable velocity, which is c ose to the rotational velocity of the rotor blade. The two separation zones and the centrifugal force guide the flow through the rotor blade into a diagonal direction with a major radial velocity com blade tips at the inlet of the last blade row. ponent, as shown in Figure 2. The highest temperatures are measured at the Fig. 2 Flow Field of A Low Pressure Turbine Under Low Volume Flow Operation [1].
stresses get increased sharply with 2-3 times higher than the dynamic stresses at rated conditions while operated at LVF. This increase of stress is due to the change of turbine operational mode to compressor type mode where there is drastic increase of pressure and velocity of flow in tip region of LSMB. Engelke et al. [5] showed the variation of stress in a model steam turbine close to the point where the last stage produces zero power refer fig 3. Fig. 3 Variation of Stresses with the Volume Flow.
Fig. 4 Frequency spectra of total pressure in axial gap of a last stage of a model turbine [4]
Fig. 5 Blade geometry of rotor with parameters The blade is then exported to the ANSYS WORKBENCH FLUENT for 3 D CFD Analysis. Since from previous work, it is observed that the model air behaves in a similar manner as of the actual steam turbine. So in the current study we are going to analyze the flow of air with the parameters shown in the table 1 for different mass flow rate at constant rpm and determine the changes occurred. International Journal of Recent advances in Mechanical Engineering (IJMECH) Vol.4, No.2, May 2015
Fig. 6 Meshing of the blade geometry in a rectangular box
AS we are comparing the experimental results with the computational results on model air turbine by keeping the same rotational speed of rotor as 6300 rpm and reducing the mass flow rate from 5.75 Kg/s to 1.15 Kg/s and analyze the changes that will be going to take place across the suction and pressure sides of the blade geometry. Fig7. shows the pressure distributions across the blade surface compared with the experimental data. The comparison is some what similar to the experimental results. The plot of static pressures across the surface of the blade is shown in the fig8. The static pressure plot on the surface at design mass flow rate fig (a) and reduced mass flow rate fig (b). Clearly indicates how the pressure rises due to reduce in the mass flow rate at the last stage of low pressure turbines Fig. 7 Steady pressure distribution compared to the experimental data.
International Journal of Recent advances in Mechanical Engineering (IJMECH) Vol.4, No.2, May 2015 Fig. 8 Shows the plot of static pressure at design and off design mass flow conditions
Fig. 9 Shows the 2D analysis of flow over the stator and rotor blades
Fig. 10 Complex flow pattern over the blade at 20% of design Mass flow rate. International Journal of Recent advances in Mechanical Engineering (IJMECH) Vol.4, No.2, May 2015
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Gas Foil Bearing Analysis and the Effect of Bump Foil Thickness on its Performance Characteristics Using a Non-Linear Matrix Equation Solver
by Sashindra Kakoty

2024, International Journal of Recent advances in Mechanical Engineering

Gas foil bearings (GFBs) satisfy many of the requirements noted for novel oil-free turbomachinery. However, GFBs have a limited load carrying capacity. This paper presents a numerical model in order to assess the performance... more
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Effect of Cylindrical Texture on Dynamic Characteristics of Journal Bearing
by Sashindra Kakoty

2024, International Journal of Recent advances in Mechanical Engineering

Effect of cylindrical texture on dynamic characteristics of hydrodynamic journal bearing is presented in this paper. The Reynolds equation is discretized by finite difference method and solved numerically in an iterative scheme satisfying... more
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Dynamic Characteristics and Stability of Cylindrical Textured Journal Bearing
by Sashindra Kakoty

2024, International Journal of Recent advances in Mechanical Engineering

The dynamic characteristics of cylindrical textured hydrodynamic journal bearing are presented in this paper. The Reynolds equation is solved numerically in a finite difference grid in an iterative scheme satisfying the appropriate... more
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Influence of the snubber on temperature distribution at last stage blade exit of a steam turbine during low volume flow operations
by ANTONIO MAMBRO

2024, Applied Thermal Engineering

Detailed traverse measurements on last stage blades with/without snubber. • Validation of the results for both set of rear stages via CFD. • Analysis and comparison of the results. • Detailed discussion of tip cooling mechanism for... more
Fig. 20. Detailed view of y+ contour plot around the LSMB snubber (a) suctior side (bottom half) (b) pressure side (top half).
Fig. 1. Schematic representation of Flow Reversal Phenomenon.
Fig. 2. Cross section of the model scaled steam turbine [11].
Fig. 3. Exhaust hood of the investigated model scaled steam turbine [11].
Fig. 4. (a) Cross-sectional view of the model steam turbine rear stages, (b) upstream view of plane 62, probe traverse and location marked in red.(For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
Fig. 5. Five-hole probe used for flow field measurements.
Fig. 7. Measured ventilation power for a given test case.
Fig. 6. Detailed view of the snubber geometry (67% blade span).
Fig. 9. Measured axial velocity distribution for freestanding and snubber blades on plane 62 at different circumferential locations for test case 1. The reverse flow height is about 60% of the blade span. The pressure distribution along the circumference at the LSMB outlet seems to be uniform for both sets of rear stages (Fig. 12). In fact, the difference in measured static pressure is for most of the blade span
Fig. 8. Measured average ventilation power at different test cases for the freestanding and snubber rear stages.
Fig. 10. Measured radial velocity distribution for freestanding and snubber blades on plane 62 at different circumferential locations for test case 1
Fig. 11. Measured absolute velocity distribution for freestanding and snubber blades on plane 62 at different circumferential locations for test case 1
Fig. 12. Measured static pressure distribution for freestanding and snubber blades on plane 62 at different circumferential locations for test case 1
Fig. 13. Measured total pressure distribution for freestanding and snubber blades on plane 62 at different circumferential locations for test case 1.
Fig. 14. Measured temperature distribution for freestanding and snubber blades on plane 62 for different test cases
Fig. 15. CFD model with 4 sectors (left), detailed view of the multiple mixing plane used as interface between the LSMB and diffuser (right).
Fig. 17. Sensitivity analysis on element span-wise distributed at the LSMB outlet.
Fig. 16. Grid details of last stage rotor blade.
Fig. 18. LSMB tip gap mash [11].
Fig. 19. Detailed view of the snubber mesh. 106 elements span-wise distributed, Fig. 17. The box mesh type does not lead to any significant difference in results. The automatic wall function has been used for near wall calcula- tions. This option offers a formulation which automatically switch from wall-functions to a low-RE near wall formulation as the mesh is refined. The k- w model of Wilcox (and therefore the SST turbulence model), has the advantage that an analytical expression is known for the w sublayer, which can be exploited to achieve the target. The main idea behind the present formulation is to blend the wall value for w between the The tip gap has been considered in modelling the LSMB (see Fig. 18). The exhaust box has been discretized with all the furniture, stiffening plates, pipes etc. For the snubber last stage blade, the mesh has been refined in cor- respondence of the snubber, as shown in Fig. 19.
Fig. 21. y+ contour plot for last stage blades in correspondence of the hub and tip regions (stator and runner blades).
Fig. 22. Comparison of steam turbine inlet pressure between measurements and CFD calculations for snubber LSMB
Fig. 23. Comparison of last two stages ventilation power between measurements and CFD calculations for the snubber LSMB
Fig. 24. Comparison of span-wise blade axial velocity distribution for freestanding and snubber blades on plane 62, test case1
Fig. 25. Measurements vs CFD of temperature distribution for freestanding and snubber blades on plane 62 for test case
Fig. 26. Meridional view of the axial velocity flow field for LSMB (a) with snubber (b) freestanding.
Fig. 27. Meridional view of the axial velocity flow field without blade wireframe for LSMB (a) with snubber (b) freestanding
Fig. 28. Meridional view of the radial velocity field for LSMB (a) with snubber (b) freestanding with emphasis on the magnitude of the radial velocity in corre- spondence of the reverse flow height.
Fig. 29. Meridional view of the flow field of the snubber last stage blades with and without wireframe
Fig. 30. Meridional view of the flow temperature distribution of the snubber last stage blades with and without wireframe.
Fig. 31. Meridional view of the flow field of the freestanding last stage blades with and without wireframe.
Fig. 32. Meridional view of the flow temperature distribution of the freestanding last stage blades with and without wireframe
Test cases summary. However, at the end, the absolute velocity in the active area is ra- ther similar between the two LSMB, Fig. 11. Table 1
Number of nodes used in different grid domains for the last stage only. Table 2
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Influence of the snubber on temperature distribution at last stage blade exit of a steam turbine during low volume flow operations
by ANTONIO MAMBRO

2024, Applied Thermal Engineering

Detailed traverse measurements on last stage blades with/without snubber. • Validation of the results for both set of rear stages via CFD. • Analysis and comparison of the results. • Detailed discussion of tip cooling mechanism for... more
Fig. 1. Schematic representation of Flow Reversal Phenomenon.
Fig. 2. Cross section of the model scaled steam turbine [11].
Fig. 3. Exhaust hood of the investigated model scaled steam turbine [11].
Fig. 4. (a) Cross-sectional view of the model steam turbine rear stages, (b) upstream view of plane 62, probe traverse and location marked in red.(For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
Fig. 5. Five-hole probe used for flow field measurements.
Fig. 7. Measured ventilation power for a given test case.
Fig. 6. Detailed view of the snubber geometry (67% blade span).
Fig. 9. Measured axial velocity distribution for freestanding and snubber blades on plane 62 at different circumferential locations for test case 1. The reverse flow height is about 60% of the blade span. The pressure distribution along the circumference at the LSMB outlet seems to be uniform for both sets of rear stages (Fig. 12). In fact, the difference in measured static pressure is for most of the blade span
Fig. 8. Measured average ventilation power at different test cases for the freestanding and snubber rear stages.
Fig. 10. Measured radial velocity distribution for freestanding and snubber blades on plane 62 at different circumferential locations for test case 1
Fig. 11. Measured absolute velocity distribution for freestanding and snubber blades on plane 62 at different circumferential locations for test case 1
Fig. 12. Measured static pressure distribution for freestanding and snubber blades on plane 62 at different circumferential locations for test case 1
Fig. 13. Measured total pressure distribution for freestanding and snubber blades on plane 62 at different circumferential locations for test case 1.
Fig. 14. Measured temperature distribution for freestanding and snubber blades on plane 62 for different test cases
Fig. 15. CFD model with 4 sectors (left), detailed view of the multiple mixing plane used as interface between the LSMB and diffuser (right).
Fig. 17. Sensitivity analysis on element span-wise distributed at the LSMB outlet.
Fig. 16. Grid details of last stage rotor blade.
Fig. 18. LSMB tip gap mash [11].
Fig. 19. Detailed view of the snubber mesh. 106 elements span-wise distributed, Fig. 17. The box mesh type does not lead to any significant difference in results. The automatic wall function has been used for near wall calcula- tions. This option offers a formulation which automatically switch from wall-functions to a low-RE near wall formulation as the mesh is refined. The k- w model of Wilcox (and therefore the SST turbulence model), has the advantage that an analytical expression is known for the w sublayer, which can be exploited to achieve the target. The main idea behind the present formulation is to blend the wall value for w between the The tip gap has been considered in modelling the LSMB (see Fig. 18). The exhaust box has been discretized with all the furniture, stiffening plates, pipes etc. For the snubber last stage blade, the mesh has been refined in cor- respondence of the snubber, as shown in Fig. 19.
Fig. 20. Detailed view of y+ contour plot around the LSMB snubber (a) suctior side (bottom half) (b) pressure side (top half).
Fig. 21. y+ contour plot for last stage blades in correspondence of the hub and tip regions (stator and runner blades).
Fig. 22. Comparison of steam turbine inlet pressure between measurements and CFD calculations for snubber LSMB
Fig. 23. Comparison of last two stages ventilation power between measurements and CFD calculations for the snubber LSMB
Fig. 24. Comparison of span-wise blade axial velocity distribution for freestanding and snubber blades on plane 62, test case1
Fig. 25. Measurements vs CFD of temperature distribution for freestanding and snubber blades on plane 62 for test case
Fig. 26. Meridional view of the axial velocity flow field for LSMB (a) with snubber (b) freestanding.
Fig. 27. Meridional view of the axial velocity flow field without blade wireframe for LSMB (a) with snubber (b) freestanding
Fig. 28. Meridional view of the radial velocity field for LSMB (a) with snubber (b) freestanding with emphasis on the magnitude of the radial velocity in corre- spondence of the reverse flow height.
Fig. 29. Meridional view of the flow field of the snubber last stage blades with and without wireframe
Fig. 30. Meridional view of the flow temperature distribution of the snubber last stage blades with and without wireframe.
Fig. 31. Meridional view of the flow field of the freestanding last stage blades with and without wireframe.
Fig. 32. Meridional view of the flow temperature distribution of the freestanding last stage blades with and without wireframe
Test cases summary. However, at the end, the absolute velocity in the active area is ra- ther similar between the two LSMB, Fig. 11. Table 1
Number of nodes used in different grid domains for the last stage only. Table 2
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Modeling, design and simulation of a manipulator robot
by Zouaoui SATLA

2024

The aim of this study is to learn how design and simulate a very complicated industrial robot. This study is divided into two parts: The first part of this study: creating and designing an industrial robot using SolidWorks and... more
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Modeling, design and simulation of a manipulator robot
by Zouaoui SATLA

2024

for guiding me throughout my work, for their contribution to our training and the help provided for the realization of this thesis of Masters. It is thanks to their human and scientific qualities that we have been able to continue and... more
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Effects of Viscosity Variations on Buoyancy-Driven Flow from a Horizontal Circular Cylinder Immersed in Al2O3-Water Nanofluid
by Mohammad Rafiq Habibi

2024, Iranian Journal of Chemistry & Chemical Engineering-international English Edition

The buoyancy-driven boundary-layer flow from a heated horizontal circular cylinder immersed in a water-based alumina (Al2O3) nanofluid is investigated using variable properties for nanofluid viscosity. Two different viscosity models are... more
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Thermal performance of wavy finned absorber solar air heater
by Abhishek Priyam

2024, International Journal of Heat and Technology

This paper presents an experimental investigation on the thermal performance enhancement of solar air heater having wavy fins attached below the absorber plate. Tests were conducted to cover a wide range of parameters such as mass,... more
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An over-actuated modular platform for aerial inspection and manipulation
by Roberto Naldi

2024, 2013 IEEE/RSJ International Conference on Intelligent Robots and Systems

This video shows an innovative over-actuated aerial vehicle specifically designed for tasks requiring high maneuverability such as aerial inspection of infrastructure and aerial manipulation. The main feature of the system is the fact... more
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Nanoparçacık katkılı yağlayıcı akışkanın radyal hidrostatik yatağın yük taşıma kapasitesine etkisi
by ali ozhan akyuz

2024, El-cezeri

Hydrostatic journal bearings are recommended for supporting shafts operating at high speeds and under heavy loads in the industry. In the journal bearings, lubricant viscosity decreases with increasing temperature at high rotation speeds... more
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Preliminary control design on spherically-connected multiple-quadrotor manipulator system
by hai nguyen

2024, 2015 12th International Conference on Ubiquitous Robots and Ambient Intelligence (URAI)

We introduce a new aerial manipulator system that consists of an airborne base actuated by multiple spherically-connected quadrotors and a manipulator rigidly connected to that base. We first model the dynamics of the system and show that... more
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Application of Value Stream Mapping Tool to Reduce Wastes in Bearing Industry
by Praveen Saraswat

2024, International Journal of Recent advances in Mechanical Engineering

In today's highly competitive business environment, companies require improvement in Production Lead Times, costs and customer service levels to survive. Because of this, companies have become more customers focused. The result is that... more
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Influence of Micropolar Lubrication on the Performance of 4-Pocket Capillary Compensated Conical Hybrid Journal Bearing
by Arvind Kumar Rajput

2024, Advances in Tribology

The present paper deals with a theoretical analysis of 4-pocket capillary compensated conical hybrid journal bearing system operating with micropolar lubricant. The modified Reynolds equation for a conical journal bearing system operating... more
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AMPPS_CNC in An Automated Modular Process Planning System for Rotational Part
by Prakash Khodke

2023, International Journal of Recent advances in Mechanical Engineering

The decision on sequencing of operations, tool travel and machining time calculations is done in microplanning. After a set of processes has been selected for all the features of part, the sequencing task begins by searching and analysing... more
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Cutting Parameters Optimization in Turning Operation using Taguschi Method
by Nitesh Dutt

2023, International Journal of Materials Manufacturing and Sustainable Technologies

The objective of this study is to optimise the cutting parameters in Turning Operation. For this objective Taguchi Method was used. S/N ratio, ANNOVA was used to investigate the cutting force components & Material removal rate (MRR). In... more
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Numerical Investigation of Natural Convection Heat Transferfrom Square Cylinder in an Enclosed Enclosure Filled with Nanofluids
by ghalib kahwaji

2023, International journal of recent advances in mechanical engineering

The enhancement of natural convection heat transfer using nanofluids from horizontal square cylinder placed in a square enclosure is investigated numerically. Water-based Cu is used as the working nanofluid. The investigation covered a... more
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Unsteady aerodynamics of low-pressure steam turbines operating under low volume flow conditions
by Benjamin Megerle

2023

This work was conducted during my employment at ALSTOM (Switzerland) ltd. in cooperation with the Group of Thermal Turbomachinery at the École Polytechnique Fédérale de Lausanne (EPFL) under the direction of Dr Peter Ott. First I like to... more
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Computed Torque Control of an Aerial Manipulation System with a Quadrotor and a 2-DOF Robotic Arm
by Kutluk Bilge Arikan

2023

This paper presents the control of an aerial manipulation system with a quadrotor and a 2-DOF robotic arm by using the computed torque control method. The kinematic and dynamic model of the system is obtained by modeling the quadrotor and... more
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An over-actuated modular platform for aerial inspection and manipulation
by Roberto Naldi

2023

This video shows an innovative over-actuated aerial vehicle specifically designed for tasks requiring high maneuverability such as aerial inspection of infrastructure and aerial manipulation. The main feature of the system is the fact... more
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Influence Of Process Parameters On Performance Of Wire Edm By Multi objective Genetic Algorithm
by Amber Batwara

2023, International journal of recent advances in mechanical engineering

Wire EDM machines are developed to cut any type of material which have soft to hard behavior in present era. Material must have conductive in nature for this type of machine operation like metals, alloys etc. Wire EDM machine can cut... more
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Prediction of Surface Roughness of U71Mn Steel Milling Based on RBF Neural Network
by Kevin Jenny

2023, Journal of Basic & Applied Sciences

In order to predict the surface roughness of U71Mn high manganese steel before actual milling operation, an orthogonal experiment was designed. Based on the intelligent algorithm of Radial Basis Functions (RBF) neural network, an accurate... more
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FINITE ELEMENT ANALYSIS OF GAS FOIL BEARINGS
by IRJET Journal

2023, IRJET

Micro turbomachinery demands gas comportments to be light compact and should operate at varying temperature conditions. Low heat generation disunion and lack of lubricant rotation system makes it compact dependable andeco-friendly. still... more
Figure- 3: Schematic view of extended bump strips and a typical bump foil bearing 3. FINITE ELEMENT ANALYSIS USING ANSYS 3.1 GENERATION OF MESH
3.2 APPLYING BOUNDARY CONDITIONS AND LOAD Figure-3: Applying boundary conditions and bearing load to GFB1 for pressure corresponding to 1N/mm2.
Figure-2: Optimization of auto-generated mesh.
Figure-4: Applying boundary conditions, thermal conditions and bearing load to GFB1 for pressure corresponding to 1N/mmz2 and temperature 100C.
Figure 5: Variation of total deformation. Figure 6: Variation of equivalent stress
Figure 7: Directional deformation (X-axis). Figure 8: Directional deformation (Y-axis).
Figure 16: Stiffness (N/mm) vs Temperature (oC) for GFB 1.
Figure-17: Stiffness (N/mm) vs Temperature (oC) for GFB 2.
lable-1: Parameters and dimensions of 3 gas foil bearing: to be modelled and analyzed
Table 2: Bearing load and directional deformation (along X-axis) for a varying pressure range.
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A Computational Fluid Dynamic Study on Transient Thermal Characteristics of Two-Phase Gas Metal Arc Welding Process
by Deepak D Deepak

2023, International Journal of Recent advances in Mechanical Engineering

Gas Metal Arc Welding (GMAW) is a welding process where an electrode wire is continuously fed from an automatic wire feeder through a conduit and welding gun to the base metal, where a weld pool is created. The formation of droplet and... more
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Dynamic Characteristics and Stability of Short Wave Journal Bearings
by Shivam Kumar

2023, Tribology Online

A general analysis has been done to investigate the dynamic performance and stability of short wave journal bearing. Reynolds equation is solved for unsteady-state operations. The unsteady analysis has been used to determine the rotor... more
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Numerical Study on Thermal Comfort-A Case Study Using Taguchi Method
by VIKAS SHARMA

2023, International Journal of Recent advances in Mechanical Engineering

Thermal comfort is the major factor responsible for the refinement of ventilation of an office. Installation of fans inside the room greatly affects the overall air circulation of the room. The effect of Evaporative cooling with internal... more
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Strength-based design analysis of a Para-Plow tillage tool
by Mehmet Topakci

2023, Computers and Electronics in Agriculture

In this research, experimental field tests and an advanced computer aided design and engineering (CAD and CAE) based application algorithm was developed and tested. The algorithm was put into practice through a case study on the... more
Figure 2. Key aspects of the technical and dimensional specifications of the Para-Plow tool
‘igure 8. Field Test Results-02: Draft force and experimental stress values of worst-case tillage condition
' “Dept. of Agricultural Machinery and Technology Engineering, Faculty of Agriculture, Akdeniz University, Turke) Pp & ry Sy 2Dept. of Mechatronics Engineering, Faculty of Engineering, Akdeniz University, Turkey 3Engineering Dept., Lancaster University, United Kingdom Abstract
* SG: Strain Gauge ** Operated tillage area: 675(m 2)) fable 1. Draft force and equivalent (von Mises) stress values extracted from field tests
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Comparative analysis on Performance and Emission characteristics of VCR diesel engine using Nitrogenated based Additives
by Neeraj Kumar Sharma

2023, IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE)

Demand of petroleum products are increasing every year due to urbanization, increase in vehicular density and power requirement is going up and to reduce emission produced by today's diesel engine, which in turns require a clean burning... more
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AMPPS_CNC in An Automated Modular Process Planning System for Rotational Part
by Roshan Shinde

2023, International Journal of Recent advances in Mechanical Engineering

The decision on sequencing of operations, tool travel and machining time calculations is done in microplanning. After a set of processes has been selected for all the features of part, the sequencing task begins by searching and analysing... more
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Effect of Approach Angle in Face Milling Using Tungsten Carbide Tool
by sridhar atla

2023, International Journal of Recent advances in Mechanical Engineering

The influence of Approach angle of face milling cutter is investigated by conducting experiments with different approach angles in order to evaluate the effect of approach angle on productivity. The cartridges are designed, modeled and... more
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A parametric study of convective heat transfer on LNG tankby numerical simulations
by Messaoud Guellal

2023

with precision its behavior at conditions close to the storage real conditions. The proposed method is based on the ADI method. The aim of this study is to carry out a parameter setting of the principal physical properties intervening in... more
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Influence of Micropolar Lubrication on the Performance of 4-Pocket Capillary Compensated Conical Hybrid Journal Bearing
by Arvind Kumar Rajput

2023, Advances in Tribology

The present paper deals with a theoretical analysis of 4-pocket capillary compensated conical hybrid journal bearing system operating with micropolar lubricant. The modified Reynolds equation for a conical journal bearing system operating... more
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Dynamic stability of micropolar lubricated hydrodynamic offset-halves journal bearings
by sanyam sharma

2023, Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology

The plain circular journal bearings are not found to be stable by researchers when used in high speed rotating machineries. Hence, extensive research in the study of stability characteristics of non-circular bearings or lobed bearings... more
Figure |. Geometry of offset-halves bearing. Modified Reynolds equation
With the usual assumptions considered for the fluid film, the modified Reynolds equation (6), in non- dimensional form for two-dimensional flow of micro- polar lubricant is written as'” In the above equations, / is the fluid film thickness. Parameters N and /,, indicate the micropolar fluid characteristics. As illustrated in equation (8), coupling number WN can be defined as the ratio of viscous forces of relative rotation to Newtonian viscous forces. The coupling number N couples the linear and angular momentum as given in equations (6) and (7) of the micro-rotational motion of suspended particles in micropolar lubricant. The value of N lies between 0
Figure 2. Variation of bearing load with characteristics length.
Figure 3. Variation of bearing load with characteristics length for various offset and aspect ratios
Figure 4. Variation of critical mass with characteristics length for various offset and aspect ratios.
Figure 5. Variation of whirl frequency ratio with characteristics length for various offset and aspect ratios.
Figure 6. Variation of threshold speed with characteristics length for various offset and aspect ratios
Table |. Design parameters for analysis.
Table 2. Bearing geometry and operating parameter.’
Table 3. Comparison of bearing load (W) with Chetti.?* bearing load at N*=0 is found to be in good agree- ment with Singh and Gupta.® characteristics length (/,,) for different values of the offset factors (6) and aspect ratios (A) is presented in Figure higher ment o sion in 3. It is observed that bearing sustains oad at smaller values of /,, for given values of aspect ratio (A) and offset factor (6). Higher offset factor provides higher load capacity as horizontal displace- both halves of bearings, exerts more compres- fluid film. The compression in fluid film leads to higher hydrodynamic pressure which in turn increases o hold he load capacity. In addition to above, lubricant is able the journal more tightly due to horizontal dis- placement of centers of both halves.
Table 4. Stability parameters for offset factor (0.2 and 0.4) and aspect ratio (1.6 and 2.0).
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Effect ofL/DRatio on the Performance of Two-Lobe Pressure Dam Bearing: Micropolar Lubricated
by sanyam sharma

2023, Advances in Tribology

Two-lobe pressure dam bearings are commonly used in high speed rotating machineries. Their use is considered more stable than plain cylindrical bearings. Such bearings have a dam in the upper half whereas the lower half is provided with a... more
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Comparative Study of Different Combined Cycle Power Plant Schemes
by Nikhil Dev

2023, International Journal of Recent advances in Mechanical Engineering

Combined Cycle Power Plants (CCPPs) are imperative for power generation with the capability for deciphering power shortage during peak and off peak hours. To perk up the recital of the plant, foremost locations of exergy losses are to be... more
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System Modelling and Analysis of a Cogeneration Cycle Power Plant Using Graph Theoretic Approach
by Nikhil Dev

2023, International Journal of Recent advances in Mechanical Engineering

Unit electricity generation cost from an energy resource such as coal with the help of energy conversion systems such as cogeneration cycle power plant (CGCPP) is dependent upon many of the factors such as (a) system structure which is... more
System structure modeling of cogeneration cycle power plant which is to be analysed is describec in this section. This is the working of the four of its sub-systems. These sub-systems are the integral part of the macro system and none of them is not independent. The dependency of one system on the other is due to the technology of energy conversion adopted by the power plant organisation. Cogeneration cycle power plant and its components considered for the presen analysis is shown in Figure 1. The humid air at the ambient temperature and pressure (NTP) enters the air compressor after being filtered in the air filtration system. In the filteration system dust particles are removed and humidity of the air remains unaffected. In the market different sort of filters are available for filtering different impurities. Filtered air which is comparatively pure and humidified is vawi
Figure 2. System structural graph of cogeneration cycle power plant: Air compressor system (S;), Combustion chamber system (S2), Gas turbine system (S3), Heat Recovery Steam Generator system (S4) International Journal of Recent advances in Mechanical Engineering (JMECH) Vol.4, No.2, May 2015
Figure 3. Digraph showing six attributes of Cogeneration Cycle Power Plant and their interdependencies in the system (attributes: Air compressor system (S,;), Combustion chamber system (S.), Gas turbine system (S3), Heat Recovery Steam Generator system (S4))
The diagonal elements represent the contribution of systems in cogeneration cycle power plant performance. It is known as system inheritance. It is different for different systems. The off diagonal elements represent interdependencies of each system with other systems. This form of matrix is also known as variable permanent matrix (VPM). A digraph is such a representation which is easy to convert into matrix representation. Matrix representation of a digraph gives more elaboration to digraph so that it represents itself in computational form. For a general case with n systems, in that case it will be represented as:
Figure 4. Digraph showing six attributes of Cogeneration Cycle Power Plant and their interdependencies in the system (attributes: Air compressor system (S,), Combustion chamber system (S2), Gas turbine system (S3), Heat Recovery Steam Generator system (S4)) Digraph is used to represent the factors/systems and their interdependencies in terms of nodes and edges. Sj indicates degree of dependence of j' factor/system on the i” factor/system. In the digraph Sj is represented as a directed edge from node i to node j. The digraph permits to analyse cogeneration cycle power plant performance and gives a feeling of interactions between the systems. It is to be mentioned at this point that roundel size and line length may be selected as per the convenience of the researcher. It is independent of the inheritance and interlinking evaluation. There is no such direction in literature about the angle of lines also. Digraph for the cogeneration cycle power plant discussed above is shown in Figure 4.
For the system under consideration (cogeneration cycle power plant in this case), corresponding to Figure 4, variable permanent structure matrix (T,) can be written as: 4.3. Permanent representation of system structure matrix (VPSSM) for a CCPP
The value of permanent of the above function is 125, i.e. minimum Per T, = 125. International Journal of Recent advances in Mechanical Engineering (JMECH) Vol.4, No.2, May 2015
4. DEVELOPMENT OF GRAPH THEORETIC MODEL OI! COGENERATION CYCLE POWER PLANT Table 2. Quantification of interdependencies
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Development of reliability index for combined cycle power plant using graph theoretic approach
by Nikhil Dev

2023, Ain Shams Engineering Journal

A systematic approach based on graph theory and matrix method is developed ingeniously for the evaluation of reliability index for a Combined Cycle Power Plant (CCPP). In present work CCPP system is divided into six subsystems.... more
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Statistical and Regression Analysis of Vibration of Carbon Steel Cutting Tool for Turning of EN24 Steel Using Design of Experiments
by Dr. Deepak Unune

2023, International Journal of Recent advances in Mechanical Engineering

Machining is a convoluted process in which many variables can deleterious the desired results. Among them, cutting tool vibration is the most decisive phenomenon which influences dimensional precision of the components machined,... more
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A Computational Fluid Dynamic Study on Transient Thermal Characteristics of Two-Phase Gas Metal Arc Welding Process
by D. Deepak

2023, International Journal of Recent advances in Mechanical Engineering

Gas Metal Arc Welding (GMAW) is a welding process where an electrode wire is continuously fed from an automatic wire feeder through a conduit and welding gun to the base metal, where a weld pool is created. The formation of droplet and... more
Fig.1 Physical model and parameters to be considered for geometry [11] and detaches from the electrode due to arc forces. Droplets formed are transferred to workpiece The melted droplets solidify at the workpiece and form a part of welded joint.
International Journal of Recent advances in Mechanical Engineering (IJMECH) Vol.3, No.2, May 2014 Fig.2 Axi-symmetric Meshed of domain used for Computation 2.3.Conservation of Mass: The transport equation for conservation of mass is given as
International Journal of Recent advances in Mechanical Engineering IJMECH) Vol.3, No.2, May 2014 3.2.Electric Potential and Current Density: Figure 5. shows contours of electric potential in the region between electrode and workpiece. There are two distinct regions are observed where dense electric potential contours are observed. One is around electrode with upside contour and another is at cathode with downside contour. The gradient of electrical potential is current density. Figure 6 shows contours of electric current density. The electric potential contours are denser where the current density is higher.
Fig. 5 Contours of electric potential
Fig. 6. Contours of electric current density in A/m? International Journal of Recent advances in Mechanical Engineering (IJMECH) Vol.3, No.2, May 2014
Figure 7 shows contours of temperature. As there is high amount of heat generated, the amount of temperature generated is also high. The instantaneous temperature near the electrode is near about 20000K. At start the temperature increases rapidly, as enormous heat is generated. The temperature in the system starts reducing as gases comes into the action. The inert gases cause rapid cooling of the system. Gases while flowing over the work piece carries heat away from the weld region causing reduction in temperature of weld region.
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Designing, Implementation, Evolution and Execution of An Intelligent Manufacturing System
by Pawan Sharma

2022, International Journal of Recent advances in Mechanical Engineering

This paper shows a framework of the different techniques for the design of the planning and governing components, implementation, Evolution and execution of an intelligent manufacturing system. Architecture of a modern manufacturing... more
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Gas Foil Bearing Analysis and the Effect of Bump Foil Thickness on its Performance Characteristics Using a Non-Linear Matrix Equation Solver
by T Moasunep Jamir and 
1 more
S. Kakoty

2022, International Journal of Recent advances in Mechanical Engineering

Gas foil bearings (GFBs) satisfy many of the requirements noted for novel oil-free turbomachinery. However, GFBs have a limited load carrying capacity. This paper presents a numerical model in order to assess the performance... more
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Evaluating Two-Dimensional Warranty Reserve with Accounting for Usage Intensity
by Mahmoud Hassan

2022, International Journal of Recent Advances in Mechanical Engineering

Evaluating warranty reserve fund is one of the most intricate problems undertaken by sellers. Many researchers introduced two dimensional models to build realistic models for evaluating warranty cost as a function of product age and its... more
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Comparative Analysis of Passenger Ride Comfort using Various Semi-Active Suspension Alternatives
by Dr. Devdutt Singh

2022, International Journal of Recent advances in Mechanical Engineering

In this paper, different semi-active control strategies for non-linear quarter car model equipped with controllable magneto-rheological (MR) shock absorbers and fuzzy logic controller are compared. Polynomial model is selected to... more
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Performance Prediction of a Turboshaft Engine through the use of Losses Models
by Ehsan Abbasi

2022, International Journal of Recent advances in Mechanical Engineering

The aim of present research is performance simulation of axial flow turbine by using of onedimensional modelling method. As respects the importance of modelling for performance prediction and optimization in initial designs level, in... more
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