Papers by Lasinta Ari Nendra Wibawa

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, Mar 25, 2024
This investigation seeks to discern the aerodynamic differentials between rockets featuring strai... more This investigation seeks to discern the aerodynamic differentials between rockets featuring straight fins and those with curved fins, focusing on the drag coefficient (cd), lift coefficient (cl), and moment coefficient (cm). Employing the computational fluid dynamics (CFD) methodology within ANSYS Fluent software, the research endeavors to provide comprehensive insights. The rockets under scrutiny share a common cylindrical body configuration, boasting a 70 mm diameter, a conical nose, and four symmetrically positioned fins along the lower body. The CFD analyses encompass subsonic Mach 0.6 and supersonic Mach 1.2 scenarios, with the angle of attack systematically varying from 0° to 25° at 5° intervals for each velocity setting. The outcomes of the simulations reveal notable trends: both cd and cl exhibit an upward trajectory, while cm experiences a decrement with escalating angles of attack and velocities. The culmination of Ansys CFD simulations for both rocket configurations unequivocally indicates superior flight performance for the straight fin rocket. This discernment is grounded in the observed amplification of drag and lift coefficients, coupled with the concomitant reduction in the moment coefficient, thus elucidating the nuanced aerodynamic distinctions between straight fin and curved fin rockets across varying flight conditions.

Internet of Things and Artificial Intelligence Journal, Feb 1, 2023
The quality of corn is essential to determine whether it is still suitable for consumption and wh... more The quality of corn is essential to determine whether it is still suitable for consumption and what type of corn it is. Corn is one type of vegetable that is indispensable for the nutritional needs of the Indonesian people today and is a mixture of other essential ingredients. Corn is rich in fiber, which is good for improving digestion and overcoming constipation, controlling blood sugar levels, maintaining heart health, overcoming depression, maintaining eye health, and preventing diverticulitis. In this research, image recognition is used to determine and detect the content of aflatoxin, one type of abnormality or disorder in corn. This affects the quality of corn, whether corn is suitable for human consumption, and what impact aflatoxin has on the human body. On testing using parameters Non-UV image, SGW Filter Image θ = 0, 90, 180, and 270, and The resulting SGW image with the number of orientations N = 4, θ = θ + pi/N, and θ = θ + 2*pi/N, The aflatoxin content in humans can cause carcinogenic or liver cancer and acute necrosis, cirrhosis, and carcinoma in the animal liver.
Lightweight optimization design of thin-walled cylindrical rocket motor tube using FEA
Nucleation and Atmospheric Aerosols, 2023

AIP Conference Proceedings, 2023
The thread joints are often used to connect a rocket tube to a cap and a rocket tube to a nozzle.... more The thread joints are often used to connect a rocket tube to a cap and a rocket tube to a nozzle. The connection of two components using a thread joint needs to be considered carefully. The joint is the part that most often fails because it is the location of the stress concentration. The study aims to examine the effect of load variations and thread types on the joint strength between the cap and rocket tube using the finite element method. The analysis was carried out with the help of the Ansys Workbench software. Loads of thread joint was varied 70, 80, 90, 100, and 110 kN. The rocket cap and tube material are Al 6061-T6. Static stress simulation results show that the thread joints both square thread and trapezoidal threads can withstand static loads of up to 100 kN because it has a safety factor of more than 1.25. The trapezoidal thread has a better safety factor than the square thread.
Zenodo (CERN European Organization for Nuclear Research), Mar 10, 2019
This study examined the effect of material selection on the strength of the main landing gear fra... more This study examined the effect of material selection on the strength of the main landing gear frame for UAV aircraft using the finite element method. Linear static analysis was carried out using Autodesk Inventor
Jurnal Mesin Nusantara
The main landing gear is one of the important components in UAV aircraft. This paper aims to anal... more The main landing gear is one of the important components in UAV aircraft. This paper aims to analyze the natural frequency of the main landing gear and determine its normal mode shape. This analysis is important so that no resonance causes damage to the main landing gear components. The main landing gear uses Aluminum 6061 material and the analysis is carried out using the finite element method with the help of Ansys Workbench software. The analysis showed that the natural main landing gear frequencies for mode 1 to mode 6 were 76.04 Hz, 85.07 Hz, 167.82 Hz, 201.92 Hz, 288.39 Hz, and 327.00 Hz, respectively. The maximum deformation of the main landing gear for mode 1 to mode 6 is 33.73 mm, 35.35 mm, 48.16 mm, 44.62 mm, 38.14 mm, and 41.51 mm, respectively.
Effect of cylinder length on the ratio of safety factor and weight of rocket motor tube using thin-walled cylinder
AIP Conference Proceedings

R.E.M. (Rekayasa Energi Manufaktur) Jurnal
The rocket motor test stand is the equipment used to test the rocket motor's performance unde... more The rocket motor test stand is the equipment used to test the rocket motor's performance under controlled conditions. This equipment is used to measure the thrust of the Dextrose rocket motor and test the ability of components such as the tube, fuel, nozzle and cap of the rocket itself. Before the Dextrose rocket flight test is carried out, it must go through this test. In this study, the variations in the thrust are 2000, 2250, 2500, 2750, and 3000 N. The rocket motor test stands used Aluminum 6063-T6 which has light density and medium strength. Numerical simulations were carried out with Ansys Workbench software using the finite element method. The results of the static stress analysis show that the greater the thrust, the greater the maximum von Mises stress and deformation. It is inversely related to the safety factor. The greater the thrust, the lower the safety factor of the rocket motor test stand. The results of the fatigue simulation show that the greater the thrust, th...
Jurnal Teknik Mesin Indonesia, 2021
Makalah ini memaparkan tentang desain rak roket portabel dan analisis tegangan statik menggunakan... more Makalah ini memaparkan tentang desain rak roket portabel dan analisis tegangan statik menggunakan simulasi numerik. Rangka rak roket portabel didesain untuk mampu membawa 5 unit roket. Pada penelitian ini, beban tiap roket divariasikan 150 kg, 175 kg, 200 kg, dan 225 kg. Material rangka rak roket portabel menggunakan Aluminium 6061-T6. Simulasi numerik dilakukan dengan bantuan perangkat lunak Autodesk Inventor Professional 2017. Hasil analisis tegangan statik menunjukkan tegangan von Mises maksimum rak roket portabel untuk variasi beban 150 kg, 175 kg, 200 kg, dan 225 kg berturut-turut adalah 96,41 MPa, 112,5 MPa, 128,54 MPa, dan 144,6 MPa. Rak roket portabel mampu menahan beban dinamik untuk beban tiap roket 200 kg karena memiliki faktor keamanan lebih dari 2.

The study examines the effect of the load on fatigue life prediction of an outdoor AC bracket usi... more The study examines the effect of the load on fatigue life prediction of an outdoor AC bracket using the finite element method. Outdoor AC bracket design uses Autodesk Inventor Professional 2017, while finite element analysis uses Ansys Workbench. The outdoor AC bracket is subjected to a load of 20, 25, 30, and 35 kg with a fully-reserved type of loading. Gerber's mean stress theory is used to predict fatigue life. The outdoor AC bracket material uses Aluminum alloy 5052. The simulation results show that the outdoor AC bracket has a minimum fatigue life for loads of 20, 25, 30, and 35 kg, respectively is 1 x 108, 1.49 x 107, 1.93 x 106, and 6.64 x 105 cycles. Whereas the safety factor for minimum fatigue life for loads of 20, 25, 30, and 35 kg is 1.65; 1.32; 1.10; and 0.58. It shows the outdoor AC bracket can withstand the fatigue life of up to a minimum of 106 cycles for loads of 20, 25, and 30 kg because it has a safety factor of more than 1. While the 35 kg load of outdoor AC ...
Makalah ini memaparkan tentang desain rak roket portabel dan analisis tegangan statik menggunakan... more Makalah ini memaparkan tentang desain rak roket portabel dan analisis tegangan statik menggunakan simulasi numerik. Rangka rak roket portabel didesain untuk mampu membawa 5 unit roket. Pada penelitian ini, beban tiap roket divariasikan 150 kg, 175 kg, 200 kg, dan 225 kg. Material rangka rak roket portabel menggunakan Aluminium 6061-T6. Simulasi numerik dilakukan dengan bantuan perangkat lunak Autodesk Inventor Professional 2017. Hasil analisis tegangan statik menunjukkan tegangan von Mises maksimum rak roket portabel untuk variasi beban 150 kg, 175 kg, 200 kg, dan 225 kg berturut-turut adalah 96,41 MPa, 112,5 MPa, 128,54 MPa, dan 144,6 MPa. Rak roket portabel mampu menahan beban dinamik untuk beban tiap roket 200 kg karena memiliki faktor keamanan lebih dari 2.
TURBULEN Jurnal Teknik Mesin, Dec 22, 2018
This study examined the design and analysis of the strength of the trash bin frame using the fini... more This study examined the design and analysis of the strength of the trash bin frame using the finite element method. The analysis was carried out using Autodesk Inventor Professional 2017. The frame material used was Aluminum 5052 with ISO 10799-2 (Square) standard with the size of 25 x 25 x 2 mm. Variable load of trash bin was 55 kg, 60 kg, 65 kg, and 70 kg. The simulation results show that a load of a trash bin with the weight of 55 kg, 60 kg, 65 kg, and 70 kg had the safety factor of 2,

Currently, the gantry crane in LAPAN Garut still uses steel material. The steel material is prote... more Currently, the gantry crane in LAPAN Garut still uses steel material. The steel material is protected using a coating to minimize the impact of corrosion. However, this method is less efficient, considering the corrosion rate in LAPAN Garut is very high because it is located on the coast of Cilauteureun. It also creates problems in terms of maintenance because it has to be done regularly and periodically repainting. In <br> addition, not all equipment is available maintenance funds every year. The objective of this paper is to design and analyze the stress of a gantry crane with a capacity of 9 tons using Aluminum 6061 material. The material used is three units of JIS G 3192 H standard frame (I-shape) with a size of 150 x 150 x 7 mm, four units of JIS G 3466 frame (square profile) with a size of 150 x 150 x 6 mm, and four units of JIS G 3466 frame (square profile) with a size of 125 x 125 x 6 mm. Finite element analysis is performed using Autodesk Inventor Professional 2017 so...

Pengaruh Variasi Tegangan dan Waktu Pelapisan pada Proses Elektroplating Baja Karbon Rendah dengan Pelapis Seng terhadap Ketebalan dan Laju Deposit
Penelitian ini bertujuan untuk mengetahui pengaruh tegangan dan waktu pelapisan terhadap ketebala... more Penelitian ini bertujuan untuk mengetahui pengaruh tegangan dan waktu pelapisan terhadap ketebalan dan laju deposit lapisan seng pada permukaan baja karbon rendah AISI 1020. Spesimen yang digunakan berbentuk plat strip dengan panjang 100 mm, lebar 30 mm, dan tebal 3 mm. Pelapisan seng dilakukan dalam larutan elektrolit dengan kandungan sodium hydroxide 525 gr/liter, zinc oxide 97,5 gr/liter, rochelle salt 9,75 gr/liter, dan aquades. Baja karbon rendah AISI 1020 berfungsi sebagai katoda dan anoda seng (Zn) sebagai anoda. Waktu pelapisan (10, 20, 30, dan 40 menit) dan tegangan katoda (2, 4, 6, dan 8 V) sebagai variabel pelapisan. Pengukuran ketebalan deposit dilakukan dengan alat coating thickness meassuring instrument dualscope MPOR sesuai dengan ASTM B 499. Hasil penelitian menunjukkan bahwa semakin lama waktu pelapisan mengakibatkan ketebalan deposit meningkat, sementara laju depositnya semakin menurun. Ketebalan deposit meningkat seiring dengan meningkatnya tegangan, kecuali pada tegangan 8 V dengan waktu pelapisan 40 menit terjadi penurunan. Kata kunci: elektroplating seng, ketebalan, laju deposit, tegangan, waktu pelapisan
Analisis Hasil Pengecoran Logam Aluminium dengan Cetakan Pasir

Effect of Fillet Radius of UAV Main Landing Gear on Static Stress and Fatigue Life using Finite Element Method
Journal of Physics: Conference Series, 2021
The landing gear is one crucial component in the UAV aircraft structure because it serves as the ... more The landing gear is one crucial component in the UAV aircraft structure because it serves as the main supporting component of aircraft load when landing and take-off. This study aims to determine the effect of the fillet radius on static stress and fatigue life of the main landing gear for UAV aircraft. Static stress and fatigue life analysis using the finite element method with Ansys Workbench software. The fillet radius is varied 120, 130, 140, and 150 mm. Predictions for fatigue life use the Gerber mean stress theory with a full-reserved type of loading. Landing gear material uses Aluminium alloy 6061. The static stress analysis shows that the higher the fillet radius, the higher the von Mises stress of the main landing gear frame. The fatigue life analysis shows that the higher the fillet radius, the lower the fatigue life of the main landing gear frame. The main landing gear frame achieves the highest fatigue life of up to 3.90 x 107 cycles at a fillet radius of 120 mm.
The landing gear is one crucial component in an Unmanned Aerial Vehicle (UAV) aircraft constructi... more The landing gear is one crucial component in an Unmanned Aerial Vehicle (UAV) aircraft construction. Landing gear serves as the main supporting component of aircraft load when landing and take off. This research aims to investigate the fatigue design life of the main landing gear on the UAV aircraft. The main landing gear frame design used Autodesk Inventor Professional 2017, while finite element analysis used Ansys Workbench software. It is subjected to a load of 1500 N with a loading fully-reserved. The prediction for fatigue life using Gerber mean stress theory. The material of the main landing gear frame is Aluminum alloy 6061. The simulation results show that the main landing gear frame has a minimum fatigue life of up to 3.5 x 10 7 cycles with a minimum safety factor of 1.43.

Desain, Pemilihan Material, Dan Faktor Keamanan Stasiun Pengisian Gawai Menggunakan Metode Elemen Hingga
Penggunaan gawai di lingkungan kerja saat ini sudah menjadi kebutuhan umum. Gawai menjadi salah s... more Penggunaan gawai di lingkungan kerja saat ini sudah menjadi kebutuhan umum. Gawai menjadi salah satu produk teknologi yang sangat penting dalam menunjang produktifitas kerja dan memudahkan komunikasi antar pegawai. Kondisi ini menyebabkan stasiun pengisian gawai menjadi media yang sangat penting untuk menjaga konektivitas antar pegawai. Penelitian ini bertujuan mendesain stasiun pengisian gawai menggunakan material Polikarbonat dan HDPE. Pemilihan kedua material tersebut didasarkan pertimbangan sifat isolator listrik yang tak dimiliki oleh material logam. Hal ini sangat penting untuk menjaga keamanan dan keselamatan dalam penggunaannya. Analisis elemen hingga dilakukan menggunakan software Autodesk Inventor Professional 2017. Variasi beban yang digunakan adalah 4 kg, 5 kg, dan 6 kg. Hasil simulasi menunjukkan material HDPE dengan variasi beban 4 kg, 5 kg, dan 6 kg memiliki faktor keamanan berturut-turut sebesar 2,65, 2,12, dan 1,77. Faktor keamanan menggunakan material Polikarbonat ...
This study examined the effect of material selection on the strength of the main landing gear fra... more This study examined the effect of material selection on the strength of the main landing gear frame for UAV aircraft using the finite element method. Linear static analysis was carried out using Autodesk Inventor Professional 2017 software. Main landing gear frame using Aluminum 5052-H38, Aluminium 5083 87 Cold Formed, Aluminium 6061, and CFRP. UAV aircraft was weighing 85 kg with a landing speed of 10 m/s and impact time of 0,5 second. The simulation results show that the landing gear frames of the lightest in a row were CFRP, Al 5083 87 Cold Formed, Al 5052-H38, and Al 6061. Materials that have the greatest safety factor were CFRP, Al 5083 87 Cold Formed, Al 6061, and Al 5052-H38.

Crane is one of the heavy equipment that is widely used in the industry. The crane functions as a... more Crane is one of the heavy equipment that is widely used in the industry. The crane functions as a tool for lifting heavy loads and moving them from one place to another vertically and horizontally. In the LAPAN Garut office, it is used for the rocket assembly process. The study investigates the design and analysis of von Mises stress of crane structure with a capacity of 10 tons using mild steel material. The investigation was carried out numerically using Autodesk Inventor Professional 2017. The simulation results showed the Crane structure had a von Mises stress, deformation, mass, and safety factor respectively 63.73 MPa; 2,173 mm; 1.508,53 kg; and 3.25.Keywords: autodesk inventor 2017; finite element method; mild steel; stress analysis; von Mises stressABSTRAKCrane merupakan salah satu alat berat yang banyak digunakan dalam suatu industri. Crane berfungsi sebagai alat untuk mengangkat beban berat dan memindahkannya dari satu tempat ke tempat lain secara vertikal maupun horisonta...
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Papers by Lasinta Ari Nendra Wibawa