The presented research is aimed at the derivation of a mathematical model of diesel-mechanical dr... more The presented research is aimed at the derivation of a mathematical model of diesel-mechanical drivetrain of a rail vehicle. It is derived by means of the Lagrange’s equations of the second kind. The derived mathematical model allows to understand the essential principle of the derivation of the mathematical model of the diesel-mechanical drivetrain of a rail vehicle, an application of the numerical mathematical methods for the solving the equations of motion and for evaluation of the wanted outputs quantities, such as waveforms of revolutions and torques of shafts and others.
Scientific Journal of Silesian University of Technology. Series Transport, Dec 1, 2022
The predominant goal of the research presented in this paper is the design of a manipulator for a... more The predominant goal of the research presented in this paper is the design of a manipulator for a conveyor of bulk materials based on the given requirements. This issue is an emerging topical one mainly for the reasons of increasing efficiency and speed, as well as the safety of maintenance of machines and equipment. Especially, another essential aspect is the reduction of the physical strain on operators during service operations on the conveyor of bulk materials. The introductory part of this paper attends to the materials used for the production of steel structures, their technological processing, as well as different types of joining of their components. The practical part was set out to ascertain the mass and position of the center of gravity of the load itselfthe conveyor. From
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
This paper represents a continuation of the technical solution of the mast type jib crane for han... more This paper represents a continuation of the technical solution of the mast type jib crane for handling sludge pumps. It is situated and used in building no. 900, block V2 of Jaslovské Bohunice nuclear power plant. It accounts for an optimization of the original, damaged during operation, handling equipment with manual control of lift and rotation. Inasmuch as it was established that the lifting force still belongs to the recommended range of 120 N to 160 N for comfortable operation by one worker after the modifications made to the mast type jib crane, the overload of the equipment has a negligible effect on the lifting force on a crank. Due to the fact that in the original design there was a complete absence of bearings in the rotating mechanism, it is the solution to this problem that is on the subject of the paper. The difficulties with lifting the pumps from sludge ambient, which occurred during the use of the mast jib crane, was an inspiration to modifications of the original structure. As a solution, it is proposed to cancel the original construction of the carrier inserted into the support and replace it with a fixed mast on which the jib would rotate. In this way, it would potentially increase the load capacity and thus solve the problem of lifting pumps attached to the bottom of a tank. On the other hand, it is also attainable to amplify the range of action of this crane.
Investigation of road vehicles in term of their dynamics is very important task. There are assess... more Investigation of road vehicles in term of their dynamics is very important task. There are assessed two main points of view, i.e. the driving safety and ride comfort for passenger. This article is aimed at analysis of dynamics of a single-axle trailer by means of real tests. Several driving manoeuvres have been performed and evaluated, at which, when a trailer has been towed by a passenger car. As the main output parameters, acceleration signals have been measured and recorded. The vehicle-trailer combination has been moved at several driving speeds.
Freight wagons are among the most widely used means of transporting goods by land. Such a number ... more Freight wagons are among the most widely used means of transporting goods by land. Such a number of wagons and transported material and amount of material need to meet requirements in terms of safety and reliability. A wagon bogie is a key element in the wagon running safety point of view. The Y25 bogie is a most used bogie for freight wagons in the region of the central and west Europe. As this bogie was developed several decades ago, it is interesting to evaluate its running properties according to current standards. The presented research brings results of calculation of chosen basic indicators in terms of running safety. The calculations of the freight wagon with the Y25 bogie was performed by means of a multibody model. Simulation computations were carried out for an empty and loaded wagon, which has been running in curves with various radii and at several running speeds.
Journal of Mechanical and Energy Engineering, Jan 12, 2023
The paper is a continuation of the issue of the technical solution of a mast type jib crane for h... more The paper is a continuation of the issue of the technical solution of a mast type jib crane for handling sludge pumps. It serves for the use in Building no. 900, Block V2, of the nuclear power plant Jaslovské Bohunice. It is an optimization of the original, in-service damaged handling device with manual control of lift and rotation. The overloading of the device has an insignificant effect on the lifting force on a crank handle. It was found that the lifting force permanently falls within the recommended range of 120 to 160 N for convenient operation by a single worker. Inasmuch as there is a complete absence of bearings in the slewing gear in the original design, it is the solution to this issue that is the subject of the paper. The problem of pulling out the sludge pumps, which was established in the course of using the jib crane, ingeniously provided the opportunities to further design changes on the original design. The solution offered was to scrap the original design of the carrier inserted into the support and replace it with a fixed mast on which the boom would rotate. Accordingly, it would potentially be feasible to increase the load capacity of the jib crane, and thus the issue of the sludge pumps attached to the tank bottom would be solved. Moreover, it is attainable to extend the scope of this crane in this way.
Current trends in the transportation industry prioritize competitive rivalry, compelling manufact... more Current trends in the transportation industry prioritize competitive rivalry, compelling manufacturers to prioritize concepts such as quality and reliability. These concepts are closely associated with public expectations of safety, vehicle lifespan, and trouble-free operation. However, the public must recognize that a vehicle weighing several hundred kilograms, moving at a non-zero speed, only contacts the road surface through a few points (depending on the number of wheels), each no larger than a human palm. Therefore, it is imperative to operate the vehicle in a manner that optimizes the behavior of these contact points. There are situations where drivers find themselves requiring dynamic vehicle handling, often unpredictable with a high degree of uncertainty. Rapid changes in direction become necessary in these cases. Such maneuvers can pose a significant risk of rollover for three-wheeled vehicles. Hence, the vehicle itself should contribute to increased ride safety. This paper...
22nd International Scientific Conference Engineering for Rural Development Proceedings
The paper is a continuation of the authors’ research dealing with a sensitivity study of the whee... more The paper is a continuation of the authors’ research dealing with a sensitivity study of the wheel camber variation of the experimental vehicle Alfa Romeo 156. A numerical comparison of the wheel camber change versus vertical axle position has already been performed and published for the vehicle in question. The same methodology was applied to four other selected axle types (for the purpose of comparison with each other), represented by vehicles in which these axles are actually implemented. As a result of the research, the values of the camber and the forces acting on the wheels during the simulated cornering of the vehicle were determined. Subsequently, the influence of the kinematic parameters on the dynamic response of the vehicle was evaluated. The current work of the authors focuses on experimental runs performed on the real vehicle (Alfa Romeo 156). Accordingly, the data from the experimental runs are compared with a numerical simulation of the passage of the modelled vehicle...
22nd International Scientific Conference Engineering for Rural Development Proceedings
The paper is focused on a simulation of a railway freight wagon running on a test track with the ... more The paper is focused on a simulation of a railway freight wagon running on a test track with the given parameters. The railway freight wagon is running at different speeds and with different loads, at which the simulation is analysed from the point of view of derailment safety and lateral forces acting in the wheel/rail contact and individual bogies. The load distribution on the given railway freight wagon plays an important role in terms of the investigated parameters, and therefore it is compared, how the railway freight wagon behaves on the given track depending on a particular load distribution. The dynamic model was created in the SIMULIA – SIMPACK multi-body simulation commercial software. Components of a bogie were made in three-dimensional computer-aided design software and subsequently were imported into the multi-body simulation software. The theoretical foundations of the forces acting on the bogie, such as the vertical load, slip, or lateral forces of the wheelset, are c...
MBT bikes (or mountain bikes) are widely used bikes, which serve the most often for sport purpose... more MBT bikes (or mountain bikes) are widely used bikes, which serve the most often for sport purposes. These bikes are produced in more variants and they differ by several signs. There are dimensions, weight categories, used accessories and others. Together with this, there are different technical solutions, which make them different to each other. Usually, it refers to technical solutions of suspension system of a rear wheel of also a front wheel. A rear wheel can be suspended by different systems, which lead to different characteristics are provide different riding properties. This contribution presents an overview current technical solutions of these systems.
The article is a continuation of the issue of the technical solution of the hinge for handling sl... more The article is a continuation of the issue of the technical solution of the hinge for handling sludge pumps in the Jaslovské Bohunice nuclear power plant. The main goal is the design of the electric jib rotating mechanism. It was based on the previous proposal for placing the boom consisting of a dimensional calculation of the new support column and the proposal for placing the boom on this column. The save consisted of two bonds. The upper support of the boom was solved using a rolling bearing fixed in the upper part of the column. The bottom bearing contains an axial plain bearing and a fixed gear as part of the rotating mechanism. In the next step, it is necessary to design the attachment of the selected electric motor with a planetary gearbox and a pinion for this construction. The priority in the design will be mainly to observe the axial distance of the gears, but also to consider the mounting method given by the manufacturer and the torque generated by the engine. A holder in...
The article is the next step in the ongoing research regarding the incorporation of the proposed ... more The article is the next step in the ongoing research regarding the incorporation of the proposed bulk material turnstile assembly into an existing production line serving the food industry for bagging powdered milk. The main goal of this contribution is the presentation of the structural design and related technical calculations of the screw manipulator as part of the turnstile for loose materials. The proposed mechanism will enable precise manipulation of the turnstile, especially when it is necessary to clean the pipe connected to the turnstile. Such handling is relevant nowadays due to increasing the safety of maintenance of machines and equipment and due to reducing the physical load of maintenance workers. The results prove the appropriateness of the use of the given structural design and are the basis for further research in the given area. The results will be implemented in the form of boundary conditions for the numerical analyses of the connecting elements of the frame carr...
A bridge crane is a type of crane that is designed for lifting / lowering and transferring materi... more A bridge crane is a type of crane that is designed for lifting / lowering and transferring material in the horizontal direction and is used mainly in production halls, warehouses and transship points. A part of the lifting mechanism of the bridge crane is a crane hook on which the load is suspended. Sufficient strength is required from the crane hook in order to be able to withstand high loads relatively well. The most stressed part of the crane hook is the curved inner surface. This surface is considered critical in terms of strength. The goal of this paper is to select a suitable crane hook for a single girder bridge crane with a load capacity of 500 kg and a strength analysis of the selected crane hook. Strength analysis is performed by two methods, first is based on analytical calculation and second is based on finite element method (FEM) performed in Ansys software. The comparison of the obtained total stresses from both methods is the part of the analysis. From the results of ...
A crane bridge is a dominant component of all bridge crane. It is imperative to pay attention on ... more A crane bridge is a dominant component of all bridge crane. It is imperative to pay attention on its strength features and go through a strength analysis. The introductory part of this paper points out characteristics of a bridge crane, mainly a crane bridge and materials used to produce the crane bridge, namely S235 structural steel. The paper set out the strength analysis of the main girder of a single girder bridge crane model in the means of comparing analytical and numerical solutions. The calculations take into account the load of the main beam in its centre according to the standard STN 27 0103. The bridge crane model is designed for a 500 kg load carrying capacity. The numerical solutions are represented by finite element method (FEM) analysis in Ansys software. The intention is to determine the deformation of the main girder depending on the weight of a load and a hoist, to determine the maximum deflection and resulted bending stress. Furthermore, one of the purposes is to create the precise 3D CAD model of the main girder. The 3D CAD software Catia V5 was used to design the bridge crane model. The strength analysis of the main girder of IPE 100 profile was performed by the FEM analysis using the Ansys software and by analytical calculations. The results obtained by the computing software Ansys were only slightly smaller in comparison with the analytical calculations. Results obtained by Ansys can be considered as more accurate. It can be concluded, such the designed and strength-checked main girder can be in the future put into a production.
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