• Title, Summary, Keyword: Semi-Active Suspension

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Experimental Study of Design for Semi - Active suspension system for Railway Vehicle with narrow gauge (협궤 차량용 준능동형 현가 시스템 설계의 시험적 연구)

  • Lee Nam-Jin;Kim Chul-Gun;Nam Hak-Gi
    • Proceedings of the KSR Conference
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    • pp.811-815
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    • 2005
  • Traditional passive suspension has limitations to meet the required specifications of high level trains, and so Active suspension system is proposed to meet the requirements with active components which could be controlled by external signal for optimized behavior of train. Active suspension is to be divided by Full active suspension and Semi-active suspension whether using the external power source or not, and though the performance of Semi-Active suspension is worse than Full one. Semi-active suspension is focused with its effectiveness per cost. Semi-Active suspension system consists of sensors, ECU (electrical control unit), and variable damper, which are to be designed to be fit for train system. And the software of ECU is to be developed for to be suited to its dynamic behavior through simulation result calculated by proven model. In this experimental study, the hardware and software of semi-active suspension system is to be realized and its performance for improvement of ride quality to be confirmed through roller rig test.

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A Study on the Application of Semi-active Suspension System to a 3-D Full Vehicle Model (전차 모델에 대한 반능동 현가장치의 적용에 대한 연구)

  • 방범석;백윤수;박영필
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.938-944
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    • 1994
  • Active damping has been shown to offer increased suspension performance in terms of vehicle isolation, suspension packaging, and road-tire contract force. Many semi-active damping strategies have been introduced to approximate the response of active damping with the modulation of passive damping parameters. This study investigates the characteristics of semi-active suspension control through the simulation of passive, skyhook active, and semi-active damping models. A quarter car model is studied with the conrolled damping replacing both passive and active damping. A new semi-active scheme is suggested to eliminate the abrupt changes in semi-active damping force. It is shown that the new strategy performs almost identically to the so called "force controlled" semi-active law without steep changes in damping force or body acceleration.eleration.

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Influence of Semi-Active Suspension on Running Safety of Vehicles

  • Liu, Hong-You;Yu, Da-Lian
    • International Journal of Railway
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    • v.2 no.4
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    • pp.147-151
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    • 2009
  • Railway vehicles equipped with semi-active suspension system can improve the ride quality of car bodies. Semi-active suspension system is usually applied onto high speed train, and therefore higher running safety requirement is proposed. The influence of semi-active suspension system on safety of vehicles running on straight line and curve line is studied, and the influences of sky hook damping coefficient and system time-delay on operation safety of cars fitted with semiactive suspension system is analyzed. The results show that the vehicles equipped with semi-active suspension system, not only the vibration of car body is decreased, it can also give little influence on running safety of cars, as a result, it will not endanger the running safety of cars.

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A Study on the Field Test Characteristics of Semi-Active Suspension System with Continuous Damping Control Damper (감쇠력 가변댐퍼를 이용한 반능동 현가장치의 실차실험 특성에 관한 연구)

  • Lee, K.H.;Lee, C.T.;Jeong, H.S.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.7 no.4
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    • pp.32-38
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    • 2010
  • A semi-active suspension is an automotive technology that controls the vertical movement of the vehicle while the car is driving. The system therefore virtually eliminates body roll and pitch variation in many driving situations including cornering, accelerating, and braking. This technology allows car manufacturers to achieve a higher degree of both ride quality and car handling by keeping the tires perpendicular to the road in corners, allowing for much higher levels of grip and control. An onboard computer detects body movement from sensors located throughout the vehicle and, using data calculated by opportune control techniques, controls the action of the suspension. Semi-active systems can change the viscous damping coefficient of the shock absorber, and do not add energy to the suspension system. Though limited in their intervention (for example, the control force can never have different direction than that of the current speed of the suspension), semi-active suspensions are less expensive to design and consume far less energy. In recent time, the research in semi-active suspensions has continued to advance with respect to their capabilities, narrowing the gap between semi-active and fully active suspension systems. In this paper we are studied the characteristics of vehicle movement during the field test with conventional and semi-active suspension system.

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Influence of Semi-active Suspension on Running Safety of Vehicles

  • Liu, Hong-You;Yu, Da-Lian
    • International Journal of Railway
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    • v.3 no.2
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    • pp.68-72
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    • 2010
  • Railway vehicles equipped with semi-active suspension system can improve the ride quality of car bodies. Semi-active suspension system is usually applied onto high speed train, and therefore higher running safety requirement is desirable. The influence of semi-active suspension system on safety of vehicles running on straight line and curve line is studied, and the influences of sky hook damping coefficient and system time-delay on operational safety of cars fitted with semiactive suspension system is analyzed. The results show that in vehicles equipped with semi-active suspension system, while the vibration of car body is decreased, the running safety of cars is not affected to any significant degree. As a result, the ride quality is much improved with negligible deterioration of the running safety of cars.

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A semi-active suspension controller adapting to road variation (노면 적응 반능동 현가장치)

  • 이동락;한기봉;이시복
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.338-344
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    • 1996
  • In this paper, a semi-active suspension adapting to road variation which also considers the frequency snesitivity of human is proposed. First, a road adapting controller composed of system identification and LQG control is designed. Using the extended least squares method, the road property is estimated by system identification as it varies, and the LQG controller considering the estimated road property and the frequency sensitivity of human is designed. Next, the semi-active suspension is made, which tracks the performance of the active suspension with the road adapting controller. Through numerical simulation, the performance of the proposed semi-active suspension is compared with that of a non-adaptive semi-active suspension with frequency-shaped performance index. As a result, we see that the road adapting semi-active suspension has better performance.

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Comparative Evaluation of Sky-Hook Controllers for a Full Car Model with Active or Semi-Active Suspension Systems (능동과 반능동 현가장치로 된 전차량 모델에 대한 스카이훅 제어기의 비교 평가)

  • Yun, Il-Jung;Im, Jae-Pil
    • Journal of Institute of Control, Robotics and Systems
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    • v.7 no.7
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    • pp.614-621
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    • 2001
  • The controllers for a full car 7-DOF model with 4 active or semi-active suspension units are designed and evaluated in this research. The control algorithms for suspension systems, such as full state feedback active, full state feedback semi-active, sky-hook active, sky-hook semi-actvie, and on-off suspension systems, are analyzed and evaluated with respect to ride comfort. The vehicle dynamic performances are expressed by response curves to a bump input, performance indices for asphalt road input, and frequency characteristic curves. Heaving, rolling, and pitching inputs are applied to the vehicle dynamic system to evaluate frequency characteristics. The simulation results show that the ride quality of the sky-hook controller approaches that the full state feedback controller more closely in semi-active suspension system than in active suspension system. For the implementation of a vehicle with sky-hook suspension control systems in this paper, 7 velocity sensors are required to measure the states.

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Modeling and Dynamic Characteristics Analysis of a Continuously Variable Damper with Reverse type Semi-active Suspension. (반능동현가장치용 리버스 무단연속가변댐퍼의 모델링 및 동특성 해석)

  • 박재필;최창림;윤영환;최병근;정용길
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.937-941
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    • 2004
  • Since semi-active suspension systems of automobile, of which suspension damper are controlled actively, exhibit high performance with light system weight, low cost and low energy consumption. From this view point, semi-active suspension systems are greatly expected to be in the mainstream of future controlled suspension systems. In this Paper, mathematical modeling and dynamic characteristics analysis of a reverse continuously variable damper and valve used for semi-active suspension systems are investigated. The mathematical model of piston with valve are proposed by IMAGINE/AMESim in the paper. To verify the mathematical model developed, the dynamic characteristics are simulated by IMAGINE/AMESim and are compared with experimental results. It was confirmed that the developed models represent well the actual system and can be used for control system design.

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Design of Semi-Active suspension system for Railway Vehicle with narrow gauge (협궤 차량용 준능동형 현가 시스템 설계)

  • Lee Nam-Jin;Kim Chul-Gun;Nam Hak-Gi
    • Proceedings of the KSR Conference
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    • pp.473-478
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    • 2005
  • Active suspension system improves ride quality with optimized suspension force, generated by electric, hydrolic or pneumatic power and controlled by micro-processor under various operation condition of train, while Semi-Active susepsion system provides optimized and controlled characteristics of suspensions such as damping coefficient without external energy. The benefits fo Semi-Active suspension are no required power source and to be made compact with lower cost. Train with narrow gauge could be more unstable than one for normal or wide gauge, and it could be more vibrated than others one by external force such as aerodynamic force and track irregularity. So, the reduced ride quality could be improved with appling with Semi-active suspension system. In this report, the Semi-Active suspension system for narrow gauge train shall be proposed and to prepare the Roller Rig test of this train, integration of system, development of control algorithm and confirmation of its performance with simulation tool would be taken.

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Semi-active and Active Vibration Control to Improve Ride Comfort in Railway Vehicle (철도차량 승차감 향상을 위한 반능동/능동 진동제어)

  • You, Wonhee;Shin, Yujeong;Hur, Hyunmoo;Park, Junhyuk
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.248-253
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    • 2013
  • The maximum speed is one of the most important performance in high speed railway vehicle. The higher the train speed is, the worse the ride comfort is, In order to solve this problem, a semi-active or active suspension can be applied to high speed railway vehicle. The variable damper with hydraulic solenoid valve is used in the semi-active suspension. But the variable damper with hydraulic solenoid valve requires tank for supplying fluid. The MR(Magneto Rheological) damper can be considered instead of hydraulic variable damper which needs additional device, i.e. reserver tank for fluid. In the case of active suspension, hydraulic actuator or electro-mechanical one is used to suppress the carbody vibration in railway vehicle. In this study the MR damper and electro-mechanical actuator was considered in secondary suspension system of high speed railway vehicle. The dynamic analysis was performed by using 10-DOF dynamic equations of railway vehicle. The performance of the semi-active suspension and active suspension system were reviewed by using MATLAB/Simulink S/W. The vibration suppression effect of semi-active and active suspension system were investigated experimentally by using 1/5-scaled railway vehicle model.

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