• 제목/요약/키워드: MSC.ADAMS

검색결과 30건 처리시간 0.026초

Car Ride Safety and Comfort Analysis considering Low-frequency Vibration of Car Body

  • Kang, Sang-Wook
    • International Journal of Safety
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    • 제6권1호
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    • pp.7-10
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    • 2007
  • In this paper, we found that modification of the local flexibility (or local stiffness) of the 4 parts on which shock absorbers are mounted in the vehicle body has some influence the level of ride safety and comfort. Multi-body dynamic analysis considering the flexibility of the vehicle body is performed using MSC/ADAMS and MSC/NASTRAN. More concretely speaking, natural frequencies and mode shapes computed by MSC/NASTRAN are used as input data for multi-body dynamic analysis in MSC/ADAMS. It is confirmed that the ride comfort can be improved by appropriately changing the local stiffness of the vehicle body through several simulations using MSC/ADAMS.

Multibody models with flexible components for inflatable space structures

  • Petrolo, Marco;Governale, Giorgio;Catelani, Daniele;Carrera, Erasmo
    • Advances in aircraft and spacecraft science
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    • 제5권6호
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    • pp.653-669
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    • 2018
  • This work has the objective to analyze multibody mechanisms of inflatable structures for manned space applications. The focus is on the evaluation of the main characteristics of MaxFlex, a new module of MSC Adams including the effect of nonlinear flexible bodies. MaxFlex integrates the nonlinear Finite Element Analysis (FEA) of Nastran-SOL400-and the Adams multibody capabilities in one unique solver, providing an improvement concerning the concept and technology based on the co-simulation among solvers. MaxFlex converts the equations of motion of the nonlinear FEA into phase-space form and discretizes them according to the multibody system integrator framework. The numerical results deal with an inflatable manned space module having rigid components and a flexible coating made of Kevlar. This paper is a preliminary assessment of the computational capabilities of the software and does not provide realistic guidelines for the actual design of the structure. The analysis leads to some recommendations related to the main issues to consider in a nonlinear simulation including both rigid and flexible components. The results underline the importance of realistic deployment times and applied forces. Also, a proper structural modeling is necessary, but can lead to excessive computational overheads.

A Study on the Dynamic and Control Performance of New Type EPS systems with Two Magnetic Clutches

  • Boo, Kwang-Suck;Song, Jeong-Hoon;Lee, Jong-Il
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2004년도 ICCAS
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    • pp.1874-1879
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    • 2004
  • This paper validates new type electric power steering (EPS) system which is driven by a uni-direction rotational motor and two electromagnetic clutches. The assist motor of the new type EPS produces a torque for assisting the steering in only one direction and two electromagnetic clutches transmit the assist torque to the pinion gear in either left or right direction with respect to the steering rotation. In order to evaluate the static and dynamic characteristics of the new type EPS, the EPS has been modeled by using the well known customized software such as MSC.ADAMS and MSC.CarSim. The ADAMS software has been used to investigate the static characteristics of the proposed system. ADAMS, however, can not describe dynamics of a vehicle and perform the simulation under the various road conditions. Thus the dynamic characteristics of the vehicle including the EPS are analyzed very well by using the CarSim software. A sinusoidal steering input command is applied to the propose EPS system in order to evaluate the static characteristics, while the double lane changes are applied to the vehicle with the EPS in order to evaluate the dynamic performance. Through a series of simulations, we can conclude that the propose EPS shows the stable dynamic characteristics when the rotational direction is changed.

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상용차량용 판스프링의 이력특성 구현 (Hysteretic Characteristics of Leaf Springs in Commercial Vehicles)

  • 문원기;송철기
    • 한국자동차공학회논문집
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    • 제16권2호
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    • pp.99-105
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    • 2008
  • Multi-leaf springs are widely used for a major suspension component in many commercial vehicles. The modeling technique of multi-leaf springs is one of the most difficult problems in suspension modeling as the elements have complicated nonlinear characteristics such as a hysteresis behavior due to the friction. In this paper, hysteretic characteristics with the static and dynamic test are modeled and are simulated with three links and joints in MSC.ADAMS. Simulation results showed good agreements with test results. Using this methodology, it is expected that dynamic characteristics of suspension system with multi-leaf spring can be more accurately evaluated in vehicle dynamics.

4WS 차량의 안정성 제어 (Stability Control of Four-Wheel Steering Vehicles)

  • 고영은;송철기
    • 한국자동차공학회논문집
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    • 제16권3호
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    • pp.127-136
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    • 2008
  • Vehicle stability is a very important subject in vehicle design and control, because vehicle safety is closely dependent upon its dynamic stability. The control logic for four-wheel steering(4WS) systems, in which maintaining at least the specified stability region is the control objective, was constructed using the simplified vehicle model of 3 degree-of-freedoms. The improvement of vehicle stability was verified through computer simulations for the slalom and the double lane change maneuver using the multi-body dynamic model in MSC.ADAMS.

직렬 4기통 엔진의 가진력 해석 (Analysis of Exciting Forces for In-Line 4 Cylinders Engine)

  • 김진훈;이수종;이우현;김정렬
    • 동력기계공학회지
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    • 제12권1호
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    • pp.41-46
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    • 2008
  • The primary objective of this study is to truly understand exciting forces of the in-line 4 cylinders engine. Exciting forces of the engine apply a source of the vehicle NVH(Noise, Vibration, Harshness). To understand exciting forces, first was governed theoretical equations for single cylinder engine. And this theoretical equations was programming using MATLAB software. To compare theoretical analysis value, was applied MSC.ADAMS software. To determined the specification of engine(2,000cc, in-line 4) was applied ADAMS/Engine module. And this specification for engine was applied ADAMS/View and MATLAB software. The geometry model for ADAMS/View analysis was produced by the 3-D design modeling software. After imported 3-D model, each rigid body was jointed suitable. Under idle speed for engine, was analysed. The results of analysis are fairly well agreed with those of three analysis method. Using MATLAB software proposed in this study, engine exciting fores can be predicted. Also using ADAMS/Engine module and ADAMS/View software, engine exciting forces can be predicted.

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Powertrain에 의한 차량실내소음 예측을 위한 엔진 가진력 해석에 관한 연구 (Analysis of Excitation Forces for the Prediction of the Vehicle Interior Noise by the Powertrain)

  • 이주형;김성종;김태용;이상권
    • 한국소음진동공학회논문집
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    • 제16권12호
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    • pp.1244-1251
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    • 2006
  • The objective of this paper is to get excitation forces of the engine at each of the brackets for the prediction of the vehicle interior noise by the powertrain. A powertrain geometry model is produced by CATIA and its FE model is made by MSC/Patran. A vibration mode analysis and a running mode analysis are experimentally implemented. After getting a satisfied MAC value by doing a correlation about a measured mode analysis value and analyzed value through MSC/Nastran software, all components are assembled through MSC/ADAMS software which is a dynamic analysis tool. We can predict the vibration of brackets which is the last points to occur the force of the engine combustion by analyzing the combustion force produced by engine mechanism.

실차 측정 정보를 이용한 군용 차량의 다물체 동역학 모델링 및 검증 (Modeling and Verification of Multibody Dynamics Model of Military Vehicle Using Measured Data)

  • 류치영;장진석;유완석;조진우;강이석
    • 대한기계학회논문집A
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    • 제38권11호
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    • pp.1231-1237
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    • 2014
  • 군용 차량의 경우 야지 주행에 대한 성능 시험이 필수적인데 실차 시험의 경우 비용과 시간에 의한 제약을 받게 되므로, 시뮬레이션을 통한 성능 분석이 효율적이다. 본 연구에서는 상용 다물체 해석프로그램인 MSC.ADAMS 를 이용하여 차량 모델을 개발한다. 타이어 수직 강성 시험을 수행하고 FTire 모델에 반영하여 타이어 모델을 생성한다. 댐퍼의 경우 비선형 특성 시험을 통해 얻은 결과를 반영하여 댐퍼를 모델링 하였으며, 겹판 스프링은 빔 요소 모델로 차량 모델을 구성한다. 단순 장애물 통과 시험 및 파형로 통과 시험을 수행하고 가속도 응답 및 휠 하중 응답 분석을 통해 차량 모델의 신뢰성을 검증하였다.