• Title/Summary/Keyword: Multi-Rigid Body Dynamics(MRBD)

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Analysis for the Driving Dynamic Characteristics of Large Scale Semi-Trailer Equipped with Swivel Axle and Hydropneumatic Suspension Unit (회전 차축 및 유기압 현가장치를 장착한 대용량 세미 트레일러의 주행 동특성 해석)

  • Ha, Taewan;Park, Jungsoo
    • Journal of the Korea Institute of Military Science and Technology
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    • v.25 no.2
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    • pp.196-209
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    • 2022
  • Driving dynamic characteristics of semi-trailer loaded with precise equipments are very important to protect them from vibration, impact or other disturbances. In this paper, in order to identify the driving dynamic characteristics of the large scale semi-trailer equipped with swivel axle and hydropneumatic suspension unit, Dynamics Modeling & Simulation(M&S) were performed using general Dynamics Analysis Program(RecurDyn V9R2). The semi-trailer was modeled as two types - one is Multi Rigid Body Dynamics(MRBD) model, and the other Rigid-Flexible Body Dynamics(RFlex) one. The natural vibration mode and frequencies of semi-trailer body, acceleration of dummy-weight, pitch, roll and yaw of dummy-weight, swivel axle and hydropneumatic suspension cylinder support structure, and acting force of hydropneumatic suspensions etc. were obtained from the M&S. Additionally frequency analysis were performed using the data of behavior obtained from above M&S. Generally the quantitative results of RFlex are larger than them of MRBD in view of magnitude of the comparable parametric values.

Driving Dynamic Characteristics of Tractor-Trailer Type Transporter for Large Scale Precision Equipment (대형 정밀장비 탑재용 트랙터-트레일러형 차량의 주행 동특성)

  • Ha, Taewan;Oh, Sanghoon
    • Journal of the Korea Institute of Military Science and Technology
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    • v.22 no.5
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    • pp.687-696
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    • 2019
  • To identify the driving dynamic characteristics of the Tractor-Trailer Type Transporter for mounting a large scale precision equipment, real vehicle driving tests on the 3 inch-bump-space-road were performed. And using general Dynamics Analysis Program - RecurDyn(V8R5), Dynamics M&S were carried out assuming the similar condition with real tests. Then the acceleration data obtained from real tests and M&S were analyzed and compared with each other in the part of root-mean-square-acceleration($g_{rms}$), peak-acceleration($g_{peak}$) and frequencies. In simple view of the $g_{rms}$ & $g_{peak}$, although the results of MRBD are more similar to ones of the real vehicle driving tests, but the results of RFlex have more information to get various useful dynamic characteristics.