• Title/Summary/Keyword: Vehicle suspension system

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Development and Implementation of Real Time Multibody Vehicle Dynamics Model (실시간 다물체 차량 동역학 모델 개발 및 구현)

  • O, Yeong-Seok;Kim, Seong-Su
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.25 no.5
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    • pp.834-840
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    • 2001
  • A real time multibody vehicle dynamics model has been developed and implemented using a subsystem synthesis method based on recursive formulation. To verify real time simulation capability the developed model has been applied to HMMWV(High Mobility Multipurpose Wheeled Vehicle) with steering system. For the kinematically driven steering system, the coupled front suspension-steering subsystem can be decoupled into two SLA suspension subsystems, which improves the efficiency of simulation. To investigate theoretical efficiency, operational counting method has been also employed to compare the proposed model with the conventional recursive dynamics model. Various simulations such as unsymmetric bump run, step steering(J-turn) and sine steering input test have been carried out to verify the real time feasibility of the proposed model.

An Analytical Study of Suspension Design Parameters in order to Reduce the Pitching Motion of Medium Truck (중형 트럭의 피칭 운동 저감을 위한 현가계의 설계 변수에 관한 해석적 연구)

  • 이희범;이기호;김태식;손한규;안찬우
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.3
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    • pp.154-160
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    • 1998
  • Ride quality of medium truck became a very important factor in the suspension design, to the demand of more comfortable ride of passengers. This study describes how to determine and evaluate design parameters related to the chassis suspension system with time and frequency analysis. The spring stiffness and damping force of the chassis suspension system were obtained by observing the vertical acceleration PSD. The simulation was carried out on various road profiles, which was suggested by ISO. The pitching motion of the medium size truck was observed to improve the ride quality. A computer simulated truck model was constructed using DADS, a commercial dynamic analysis software, in order to simulate the truck motions. From the analyzed process of suspension parameters, it was concluded that the spring and the shock absorbers affect the pitching of the vehicle. In order to validate the computer simulated truck model, a physical prototype was constructed and tested.

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A new method to calculate the equivalent stiffness of the suspension system of a vehicle

  • Zhao, Pinbin;Yao, Guo-Feng;Wang, Min;Wang, Xumin;Li, Jianhui
    • Structural Engineering and Mechanics
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    • v.44 no.3
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    • pp.363-378
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    • 2012
  • The stiffness of a suspension system is provided by the bushings and the stiffness of the wheel center controls the suspension's elasto-kinematic (e-k) specification. So the stiffness of the wheel center is very important, but the stiffness of the wheel center is very hard to measure. The paper give a new method that we can use the stiffness of the bushings to calculate the equivalent stiffness of the wheel center, which can quickly and widely be used in all kinds of suspension structure. This method can also be used to optimize and design the suspension system. In the example we use the method to calculate the equivalent stiffness of the wheel center which meets the symmetric and positive conditions of the stiffness matrix.

A COOPERATIVE CONTROL FOR CAR SUSPENSION AND BRAKE SYSTEMS

  • Nouillant, C.;Assadian, F.;Moreau, X.;Oustaloup, A.
    • International Journal of Automotive Technology
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    • v.3 no.4
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    • pp.147-155
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    • 2002
  • Mechatronic subsystems are more and more developed in automotive industries. To enhance the local controls performances, a cooperative control between ABS and Suspension systems is proposed. The respective controls are first designed separately with their dedicated models. Then a hybrid hierarchical architecture is developed. The advantage of this architecture is discussed through vehicle performance with simulation results.

Development of a Real-Time Vehicle Dynamic Simulation Software (실시간 차량 동역학 시뮬레이션 S/W 개발)

  • Choi, G.J.;Lee, K.H.;Yoo, Y.M.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.3 no.5
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    • pp.30-37
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    • 1995
  • In this research a real time vehicle dynamic simulation software, to be used on real time vehicle simulators, is developed using relative coordinates and suspension super-element concept. Accuracy of the software is verified through comparisons of simulation results with those of a commercial mechanical system dynamic analysis package. It is demonstrated that real time simulation on a workstation with a 15 D.O.F. vehicle model is possible.

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Design of a Disturbance Observer based Control System to Ensure Robust Stability of Quarter-Car Suspensions (1/4 차량 현가 장치의 강인 안정성을 보장하는 외란관측기 기반의 제어 시스템 설계)

  • So, Sang Gyun;Ryoo, Jung Rae;Doh, Tae-Yong
    • Journal of Institute of Control, Robotics and Systems
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    • v.22 no.12
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    • pp.995-1001
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    • 2016
  • The vehicle suspension system plays a very important part related with vehicle ride and handling. To improve the vehicle ride and handling many researches have been progressed from various damping parameter tuning techniques to the development of the electronic controlled suspension systems. In this paper, as one of the ride performance improvement a disturbance observer(DOB) based control system is applied to the quarter car vehicle model in order to show that the DOB can obtain good vibration isolation characteristics. First, the robust stability criterion for the DOB is introduced in detail, and then how DOB is applied to the 1/4 car vehicle model is represented, and finally to confirm the effectiveness of the DOB in vehicle ride performance improvement a computer simulation is carried out for various driving conditions.

New Modeling of a Suspens~on System of Macpherson Type (Macpherson형 현가시스템의 새로운 모델링)

  • 홍금식;전동섭;유완석;최재원
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.509-512
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    • 1995
  • A new modeling incorporating the role of control arm is proposed for the Macpherson type suspension system. Vertical displacement of the sprung mass and angular displacement of the control arm are selected as main control variables in the new modeling. With the same values of suspension vehicle parameters the conventional modeling and the new modeling are compared in terms of open loop characteristics.

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Overlapping Decentralized Robust EA Control Design for an Active Suspension System of a Full Car Model (전차량의 능동 현가 장치 제어를 위한 중복 분산형 견실 고유구조지정 제어기 설계)

  • 정용하;최재원;김영호
    • 제어로봇시스템학회:학술대회논문집
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    • 2000.10a
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    • pp.217-217
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    • 2000
  • A decentralized robust EA(eigensoucture assignment) controller is designed for an active suspension system of a vehicle based on a full car model with 7-degree of freedom. Using overlapping decomposition, the full car model is decentralized by two half car models. For each half car model, a robust eigenstructure assignment controller can be obtained by using optimization approach. The performance of the decentralized robust EA controller is compared with that of a conventional centralized EA controller through computer simulations.

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Sensitivity Analysis of Steering Wheel Return-ability at Low Speed

  • Cho, HyeonSeok;Lee, ByungRim;Chang, SeHyun;Park, YoungDae;Kim, MinJun;Hwang, SangWoo
    • Transactions of the Korean Society of Automotive Engineers
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    • v.25 no.2
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    • pp.167-178
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    • 2017
  • The steering wheel of a vehicle has a typical characteristic of automatically returning to its neutral state when the driver releases it. Steering returnability originated from the tire forces and kingpin moments. It is proportional to the reaction torque that is generated through the rack and column, which are dependent on suspension and steering geometry. It is also important to accurately predict and design it because steering returnability is related to steering performance. In this study, a detailed multibody dynamics model of a vehicle was designed by using ADAMS/Car and simulated for steering returnability. In addition, a tolerance analysis of the chassis system in terms of part dimension and properties has been performed in order to minimize the design parameters. The sensitivity of the selected design parameters was then analyzed via Design of Experiments(DOE). As a result, we were able to obtain the main parameters through a contribution analysis. It can be used to predict steering returnability and improve its performance, which is represented by the angle of restoration and laterality.

ANFIS Intelligence Control of a Semi-Active Suspension System (반능동 현가장치의 ANFIS 지능제어)

  • 이육형;박명관
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.11a
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    • pp.144-147
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    • 2000
  • In this paper, ANFIS intelligence control of a semi-active suspension system is investigated. The strength of the ER damper is controlled by a high voltage power supply. This paper deals with a two-degree-of-freedom suspension using the damper with ERF for a quarter vehicle system. The control law for semi-active suspensions modeled in this study is developed using passive and ANFlS control method. Computer simulation results show that the semi-active suspension with ERF damper has good performances of ride quality

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