• Title/Summary/Keyword: Semi-active suspension

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Performance Evaluation of Control Algorithms for 1/2 Tracked Vehicle with Semi-Active Suspension System (1/2 궤도차량에 대한 반능동 현수장치 제어 알고리즘들의 성능평가)

  • 윤일중;임재필;신휘범;이진규;신민재
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.4
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    • pp.139-147
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    • 2001
  • 2 DOF half-car model with 6 semi-active suspension units is utilized to evaluate the tracked vehicle dynamic performance simulated by several suspension control algorithms. The target of this research is to improve the ride comfort to maintain operator's handling capability when the tracked vehicle travels fast on the rough road. The control algorithms for suspension systems, such as full state feedback active, full state feedback semi-active, sky-hook active, sky-hook semi-active, and on-off systems, are evaluated and analyzed in view point of ride comfort. The dynamic performances of vehicle are expressed and evaluated by vibratory characteristic evaluation curves, performance indices and frequency characteristic curves. The simulation results show that the performances of sky-hook algorithms for ride comfort nearly follow those of full state feedback algorithms and on-off algorithm is recommendatory when the vehicle runs relatively fast.

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H Control of Secondary Suspension in Railway Vehicles Equipped with a MR Damper (MR 댐퍼가 적용된 철도차량 이차현가장치의 H 제어)

  • Shin, Yu Jeong;You, Won Hee;Hur, Hyun Moo;Park, Joon Hyuk
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.10
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    • pp.1051-1059
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    • 2013
  • In general, lateral ride comfort of railway vehicle is mainly influenced by a secondary suspension placed between the bogie and carbody. Higher operating speeds of train results in increased vibration of carbody, which has a negative impact related to the ride comfort. To solve this problem, researches to replace the conventional passive suspension with (semi)active technology in the secondary suspension of a railway vehicle have been carried out. The semi-active suspension using the magneto-rheological damper is relatively simpler system and has advantage in maintenance compared to the hydraulic type semi-active damper. This study was performed to reduce lateral vibration acceleration of carbody related to ride comfort of railway vehicles with a semi-active suspension system. The numerical analysis was conducted by replacing passive lateral damper with semi-active MR damper, and robust control with the MR damper was applied to the 1/5 scaled railway vehicle model.

A Study on Performance Characteristics of Semi-Active Suspension System of Tracked Vehicle (궤도차량용 반능동 현수장치 성능특성에 관한 연구)

  • 김병운;이윤복;강이석
    • Journal of the Korea Institute of Military Science and Technology
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    • v.6 no.1
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    • pp.9-20
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    • 2003
  • In this study, the performance of a semi-active suspension system for heavy duty tracked vehicles has been investigated. To this end, continuous and on-off Sky-Hook control law have been evaluated for a 1/4 car model. Simulation results show that the semi-active suspension system has potential to improve ride quality of the vehicle. And we proposed a method for improving of variable damper performance.

Semi-active control of a vehicle suspension for the ride quality improvement (승차감 향상을 위한 자동차 현가장치의 반능동제어에 관한 연구)

  • Park, Ho.;Oh, Jae-Eung
    • 제어로봇시스템학회:학술대회논문집
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    • 1990.10a
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    • pp.783-788
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    • 1990
  • Computer simulation is carried out for passive, active, and semi-active suspension system. Each RMS and frequency response to road profile input is calculated for comparison and evaluation of the performance. The vibration analysis and active control of the quarter model of a vehicle suspension is studied in order to evaluate the alternative control laws. This paper derives an optimal closed-loop feedback law for the semi-active suspension that justifies the clipped optimal approach.

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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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Road Adaptive Skyhook Control and HILS for Semi-Active Macpherson Suspension Systems (맥퍼슨형 반능동 현가장치의 노면적응형 스카이훅 제어와 HILS)

  • 박배정;홍금식
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.1
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    • pp.34-44
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    • 2000
  • In this paper, a modified skyhook control for the semi-active Macpherson suspension system is investigated. A new model for the semi-active type suspension, which incorporates the rotational motion of the unsprung mass, is introduced and an output feedback control law using the skyhook control method is derived. The gains in the skyhook controller are adaptively adjusted by estimating the road conditions. Because two vertical acceleration sensors, one for the sprung mass and another for the unsprung mass, are used rather than using the angle sensor for the rotational motion of the control arm, the relative velocity of the rattle space is filtered using the acceleration signals. For testing the control performance, the actual damping force has been incorporated via the hardware-in-the-loop simulations. The performances of a passive damper and a semi-active damper are compared. Simulation results are provided.

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Development of Practical Semi-active Suspension Control System

  • Takahashi, Hideaki;Zhang, Feifei;Mishima, Kiyoshi;Ito, Masanori
    • 제어로봇시스템학회:학술대회논문집
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    • 2003.10a
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    • pp.278-281
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    • 2003
  • The focus of this research is to realize the function which is equivalent to the active suspension system, with controlling semi-active suspension through the attenuation of power variable damper in lower cost and smaller energy. Actually some semi-active suspension systems have been adopted, but they are not sufficient in performance. The authors intended to develop more effective and practical system and applied the optimal control technique. The results of experiments with practical suspension system showed a degree of improvement of comfortableness.

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Hydropneumatic Modeling and Dynamic Characteristic Analysis of a Heavy Truck Semi-active Cabin Air Suspension System (대형 트럭 반능동형 캐빈 공기 현가시스템의 유공압 모델링 및 동특성 해석)

  • Lee, Kwang-Heon;Jeong, Heon-Sul
    • Transactions of the Korean Society of Automotive Engineers
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    • v.19 no.2
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    • pp.57-65
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    • 2011
  • In this paper, a hydropneumatic modeling and dynamic analysis of a heavy truck semi-active cabin air suspension system is presented. Semi-active cabin air suspension system improves driver's ride comfort by controlling the damping characteristics in accordance with driving situation. So it can reduce vibration between truck frame and cabin. Semi-active cabin air suspension system is consist of air spring, leveling valve and CDC shock absorber, and full cabin system are mathematically modelled using AMESim software. Simulation results of components and full cabin system are compared with experimental data of components and test results of a cabin using 6 axis simulation table. It is found that the simulation results are in good agreements with test results, and the hydropneumatic model can be used well to predict dynamic characterics of heavy truck semi-active cabin air suspension system.

Development of a Tracked Vehicle Model for Real-time Simulation of Semi-active Suspension System (반능동 현수장치의 실시간 시뮬레이션용 궤도차량 모델 개발)

  • 손영일;이종호;송병석
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.4
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    • pp.135-143
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    • 2003
  • In this study, a real-time simulation model was developed for tracked vehicles with in-arm type semi-active hydro-pneumatic suspension unit using MATLAB S-functions. Since the vehicle model uses relative coordinates and massless link elements, the developed model has an enhanced analytic time performance. Through the comparison of simulation results with multi-body software(DADS), the vehicle model is verified. A controller using on-off skyhook control algorithm is designed with the pilot-centre]led proportional valve based on conventional damper characteristics. Exploiting the developed tracked vehicle model with other subsystem model such as a controller model, a suspension unit model, and a test road model, computer simulations are carried out. Control simulation results with the developed tracked vehicle model show that the semi-active suspension control system has a better performance than the conventional suspension system.

Performance analysis of vehicle suspension systems with negative stiffness

  • Shi, Xiang;Shi, Wei;Xing, Lanchang
    • Smart Structures and Systems
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    • v.24 no.1
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    • pp.141-155
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    • 2019
  • This work evaluates the influence of negative stiffness on the performances of various vehicle suspension systems, and proposes a re-centering negative stiffness device (NSD). The re-centering NSD consists of a passive magnetic negative stiffness spring and a positioning shaft with a re-centering function. The former produces negative stiffness control forces, and the latter prevents the amplification of static spring deflection. The numerical simulations reveal that negative stiffness can improve the ride comfort of a vehicle without affecting its road holding abilities for either passive or semi-active suspension systems. In general, the improvement degree of ride comfort increases as negative stiffness increases. For passive suspension system, negative stiffness brings in negative stiffness feature in the control forces, which is helpful for the ride comfort of a vehicle. For semi-active suspensions, negative stiffness can alleviate the impact of clipped damping in semi-active dampers, and thus the ride comfort of a vehicle can be improved.