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All Journal VANOS Journal of Mechanical Engineering Education Mechanical Engineering for Society and Industry Automotive Experiences

Karmiadji, Djoko Wahyu

Pancasila University, Indonesia

Author-ID : 838784

Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Articles

LOADING ANALYSIS ON ALLOY WHEELS TYPE-253 SIZE 6.5 X 15JJ BASED ON SNI 1896:2008 WITH FINITE ELEMENT METHOD Deddy Supriyatna; Basori Basori; Djoko Wahyu Karmiadji
VANOS Journal of Mechanical Engineering Education Vol 3, No 1 (2018)
Publisher : Universitas Sultan Ageng Tirtayasa

This study analyzes the loading on the model wheel-253 size 6.5 x 15JJ based on SNI 1896: 2008 with finite element method. This load analysis tested the resistance to dynamic radial fatigue on alloy wheels by using load simulation with quasi-static failure mode approach ie failure mode which is independent of time, and its resistance to failure is expressed with strength. Test wheels are said to fail if there is crack (crack) by giving the liquid penetrant. Crack conditions in the simulation can be seen from the stress and elastic strain. The equivalent elastic stress and elastic strain values that occur on the rim must be less than the Ultimate Tensile Stress (UTS) and the elastic strain at break. The properties values for Aluminum A356-T6 material for UTS of 228 N/mm2 and strain elastic fracture values obtained from a plastic material strain of 0.059 m/m.

Evaluation of Operational Loading of the Light-Rail Transit (LRT) in Capital Region, Indonesia Djoko Wahyu Karmiadji; Muchamad Gozali; Anwar Anwar; Hedi Purnomo; Muji Setiyo; Ramli Junid
Automotive Experiences Vol 3 No 3 (2020)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

In 2015, the Indonesian government issued regulations to accelerate the implementation of integrated Light-Rail Transit (LRT) in the capital region and its surroundings. In order to ensure its operational safety, experimental work is required to test components’ strength of the manufactured LRT structures. Following the JIS 7105 standard test method, the strain and deflection of the structures were measured by vertical load, compression, rotation, and three-point load support test. The critical area estimated in the railroad structure were conducted according to the finite element method, in which strain gauges are installed in areas where the stress concentration exceeds nominal pressure, namely notches, bends, and junction areas. The result shows that the maximum stress on the LRT train structure occurs at the door, where maximum compressive strain value is -1082 μe » -75.74 MPa on the left and the maximum tensile strain value is 597 μe » 41.79 MPa at the right door. The results of fatigue load analysis represent the average stress (σm) and voltage amplitude (σa) at the coordinate system located in the Søderberg triangle. Meanwhile, the camber value with the full vertical load still has a positive value of 3.03 mm, which indicates a safe limit.

Bogie Frame Structure Evaluation for Light-Rail Transit (LRT) Train: A Static Testing Djoko Wahyu Karmiadji; Budi Haryanto; Ogi Ivano; Mustasyar Perkasa; Abdul Rohman Farid
Automotive Experiences Vol 4 No 1 (2021)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

A new bogie frame of Light-Rail Transit (LRT) is having its strength of structure verified with experimental static testing according to EN 13749 standards. Static testing of bogie frame structure of LRT is performed by using a combination of seven tensile and compression loads that comprise of operational loads (normal service) and over-loads (exceptional service). Measurement parameters of bogie frame are strain and deflection values. The strain and deflection values resulted at every step of the load test were measured and monitored to further be used as analytic data. This data is then compared to the stress data of finite element analysis to check its deviation value. Testing results show the maximum stress value is 81.48 MPa on operational load, meanwhile, for exceptional load case, maximum stress is 120.96 MPa and deflection value is 1.25 mm. The maximum stress value is still below yield strength of bogie frame material S 555J2 (y=355 MPa). According to testing data, structure of bogie frame LRT fulfill as the acceptance criteria.

Verification of urban light rail transit (LRT) bogie frame structure design lifetime under variable fatigue loads Djoko Wahyu Karmiadji; Budi Haryanto; Anwar Anwar; Budi Prasetyo; Yudi Irawadi; Abdul Rohman Farid; Isach W.Z. Karmiadji; Hijaz Ahmad
Mechanical Engineering for Society and Industry Vol 2 No 1 (2022)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.6938

The bogie frame is the main structure of the train that supports the train's loads during its operation. These structures are subject to fatigue testing to ensure their design life is up to the required standards. The urban light rail transit (LRT) bogie frame used in the Greater Jakarta area is newly designed and manufactured by a commercial railway rolling stock manufacturer. The design lifetime of this newly designed bogie frame structure under various fatigue load conditions is verified experimentally by fatigue testing. Testing and evaluations were conducted following the EN 13749 standard and VDV recommendation. The fatigue test of the urban LRT bogie frame structure was carried out in the test hall of the BPPT Structural Strength Technology Center (B2TKS) using a combination of seven loadings. The bogie frame was subjected to two variable types of fatigue loads, namely driving in curves and passing points (switches), with 2,000,000 cycles, 4,000,000 cycles, and 6,000,000 cycles of fatigue loadings. The parameter measured on the bogie frame structure is the strain value during the test using a dynamic data logger. The stress values analyzed are the average stress and the stress amplitude and then plotted on the maximum and minimum stress curve. The bogie structure is inspected by the non-destructive test method in all areas of its welded joints. This inspection is carried out before and after the test to ensure whether there are cracks caused by fatigue loads. The results of the fatigue test on the bogie structure under the variable fatigue load conditions show that the maximum stress value of 91.71 MPa at 1,500,000 cycles, that occurs during the test, does not exceed the fatigue limit of the material, and there are no cracks in the structure after the test is carried out for up to 6,000,000 cycles.

Comprehensive Analysis of Minibuses Gravity Center: A Post-Production Review for Car Body Industry Djoko Wahyu Karmiadji; Muchamad Gozali; Muji Setiyo; Thirunavukkarasu Raja; Tuessi Ari Purnomo
Mechanical Engineering for Society and Industry Vol 1 No 1 (2021)
Publisher : Universitas Muhammadiyah Magelang

The center of gravity (CoG) on the minibus is one of the fundamental parameters that affect the operation of the vehicle to maintain traffic safety. CoG greatly affects vehicle maneuverability due to load transfer between the front and rear wheels, such as when turning, braking, and accelerating. Therefore, this research was conducted to evaluate the operational safety of minibusses produced by the domestic car body industry. The case study was conducted on a minibus with a capacity of 30 passengers to be used in a mining area. Investigations on CoG were carried out based on the minibus specification data, especially the dimensions and forces acting on the wheels. Minibusses as test objects were categorized in two conditions, namely without passengers and with 30 passengers. The test results are expressed in a coordinate system (x, y, z) which represents the longitudinal, lateral, and vertical distances to the center of the front wheel axle. CoG coordinate values without passengers are (2194.92; 7.11; 1327.97) mm and CoG coordinates with full passengers (30 people) are (2388.52; 13.04; 1251.72) mm. The test results show that the change in CoG at full load is not significant which indicates the minibus is safe when maneuvering under normal conditions.

Co-Authors Abdul Rohman Farid Anwar Anwar Anwar Anwar Anwar Anwar Basori Basori Budi Haryanto Budi Haryanto Budi Haryanto Budi Prasetyo Deddy Supriyatna Farid, Abdul Rohman Gozali, Muchamad Hedi Purnomo Hijaz Ahmad Isach W.Z. Karmiadji Ivano, Ogi Junid, Ramli Muchamad Gozali Muji Setiyo Mustasyar Perkasa Ogi Ivano Perkasa, Mustasyar Purnomo, Hedi Ramli Junid Thirunavukkarasu Raja Tuessi Ari Purnomo Yudi Irawadi

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