• Title, Summary, Keyword: Sky-hook Control

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Modal Sky-Hook Dampers for Active Suspension Control (능동형 현가시스템을 위한 모드 SKY-HOOK 감쇠 제어기)

  • 곽병학;박영진
    • Transactions of the Korean Society of Automotive Engineers
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    • v.3 no.4
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    • pp.1-11
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    • 1995
  • Active suspension control for vehicles is developed to improve both ride comfort and steering stability which are in trade off relation. In this study, the modal sky-hook controller for 7 D. O. F. model is proposed to resolve the problems such as computaional power restriction and uncertainties in modeling of systems and environments. Modal sky-hook controller reduces the coupling between the modes to be controlled. The simulation result for ride comfort shows that the perform ance of the proposed controller matches that of the optimal controller. Systematic method of determining its gain is proposed. The model sky-hook controller shows the robustness to road irregularity and modeling error.

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A Study on the Performance of Car Active Suspension System by the output Feedback and Sky-hook Control Method (출력귀환과 스카이 훅 제어 방식에 의한 차량 현가 장치의 성능에 관한 연구)

  • 김재열
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.5 no.4
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    • pp.7-16
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    • 1996
  • The dynamic model of the suspension system is developed by using both sky-hook control and output feedback control techniques. based on the performance sensitivity index, Many vehicles use sky-hook control theory operated with only one sensor, due to relatively low cost and easy implementation. On the other hand, output feedback control implemented with state variables has difficulties in measuring such as tire deflection, etc.

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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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Ride Analysis of A Semi-Active Suspension Seat with Sky-Hook Control (스카이-훅 제어를 이용한 반능동 현가식 운전석의 승차감 해석)

  • Kang, T.H.;Baek, W.K.
    • Journal of Power System Engineering
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    • v.6 no.2
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    • pp.33-39
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    • 2002
  • Commercial vehicles are mostly subjected to relatively rougher ground environment than passenger vehicles. Many driver's seats of commercial vehicles have suspension system with spring and dampers. Then, impact or vibrative forces transmitted from the vehicle to the driver can be attenuated. This study deals with a ride evaluation method using sky-hook control algorithm for the suspension dampers. Vibration amplitude transmissibilities were compared between passive dampers and semi-active dampers with sky-hook control method.

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A Study on Adopting Active Suspension Control in Sky Hook System (스카이훅 시스템에의 능동 서스펜션 제어 이론 적용에 관한 연구)

  • Park Jung-Hyen;Jang Seung-Jae
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.10 no.5
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    • pp.950-955
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    • 2006
  • This paper prosed modelling and design method in suspension system sesign to analyze sky hook damper system by adopting active suspension control theory. Recent in the field of suspension system design it is general to adopt active control scheme for stiffness and damping, and connection with other vehicle stability control equipment is also intricate, it is required for control system scheme to design more robust, higher response and precision control equipment. It is hon that sky hook suspension system is better than passive spring-damper system in designing suspension equipment. We analyze location of damper in sky hook system and its motion equation then design robust control system. Numerical example is shown for validity of robust control system design in active sky hook suspension system.

Control of Semi-active Suspensions for Passenger Cars(I) (승용차용 반능동 현가시스템의 제어)

  • Jo, Yeong-Wan;Lee, Gyeong-Su
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.21 no.12
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    • pp.2179-2186
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    • 1997
  • In this paper, the performance of a semi-active suspension system for a passenger car has been investigated. Alternative semi-active suspensions control laws has been compared via simulations. The control laws investigated in this study are : sprung mass velocity feedback control law, sky-hook damping control law, and state feedback control law. Simulation results show that a semi-active suspension has potential to improve ride quality of automobiles.

Roll Characteristics Evaluation due to the Steering of a SUV with MR Dampers (MR댐퍼를 장착한 SUV의 조향으로 인한 롤 특성 평가)

  • Kang, I.P.;Baek, W.K.
    • Journal of Power System Engineering
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    • v.13 no.1
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    • pp.26-32
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    • 2009
  • This study is about roll characteristics evaluation to show the advantage of using MR(magneto-rheological) dampers for steering of a SUV(sports utility vehicle). Roll characteristics is very important to observe the roll-propensity of the SUV. ADAMS/Car program was used to simulate the basic steering motion, using 63 D.O.F. vehicle model. Sky-Hook and Ground-Hook control algorithms were used as a semi-active suspension system controller. The roll characteristics from the steering motion were compared between the simulation results from the semi-active suspension system and the passive suspension system.

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A Study on Active Suspension Robust Control with Sensor and Actuator Location (센서위치를 고려한 능동 서스펜션 강인제어에 관한 연구)

  • Park Jung-Hyen;Jang Seung-Jae
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.10 no.6
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    • pp.1147-1152
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    • 2006
  • This paper proposed modelling and design method in suspension system design to analyze sky hook damper system by adopting active robust control theory. Recent in the field of suspension system design it is general to adopt active control scheme for stiffness and damping, and connection with other vehicle stability control equipment is also intricate, it is required for control system scheme to design more robust, higher response and precision control equipment. It is known that sky hook suspension system is better than passive spring-damper system in designing suspension equipment. We analyze location of sensor and actuator in sky hook system and its motion equation, then design robust control system. Numerical example is shown for validity of robust control system design in active sky hook suspension system.

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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