• Title/Summary/Keyword: semi-active system

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Control of Semi-active Suspensions for Passenger Cars(II) (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.2187-2195
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    • 1997
  • A semi-active suspension test system was designed and built for the experimental study. Vehicle parameters were estimated through tests and a quarter-car model was validated by comparing computer simulation results and laboratory test results. Alternative semi-active suspension control laws have been tested using the test system. Modulable damper used in this study is a "reverse" damper with 42 states which is controlled by a stepper motor. Experimental results have shown that semi-active suspensions have potential to improve ride quality of automobiles.tomobiles.

Seismic Response Fuzzy Control of Adjacent Building using Semi-active MR Dampers (준능동 MR 감쇠기를 이용한 인접빌딩의 지진응답 퍼지제어)

  • Ok, Seung-Yong;Kim, Dong-Seok;Park, Kwan-Soon;Koh, Hyun-Moo
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2006.03a
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    • pp.495-502
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    • 2006
  • Seismic performance of semi-active fuzzy control algorithm to operate MR dampers for coupling adjacent building is investigated in this paper. In the proposed semi-active control technique, the fuzzy logic is used as a method to adjust input voltage to MR damper. In order to validate control performance of proposed technique, the seismic performance of the semi-active fuzzy control system is compared with that of passive control system where the input voltage to MR damper is set to display maximum damping force. The simulated results show that the semi-active fuzzy control technique effectively regulates the trade-off existing between seismic responses of two buildings subject to various earthquake excitations.

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Road-friendliness of Fuzzy Hybrid Control Strategy Based on Hardware-in-the-Loop Simulations

  • Yan, Tian Yi;Li, Qiang;Ren, Kun Ru;Wang, Yu Lin;Zhang, Lu Zou
    • Journal of Biosystems Engineering
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    • v.37 no.3
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    • pp.148-154
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    • 2012
  • Purpose: In order to improve road-friendliness of heavy vehicles, a fuzzy hybrid control strategy consisting of a hybrid control strategy and a fuzzy logic control module is proposed. The performance of the proposed strategy should be effectively evaluated using a hardware-in-the-loop (HIL) simulation model of a semi-active suspension system based on the fuzzy hybrid control strategy prior to real vehicle implementations. Methods: A hardware-in-the-loop (HIL) simulation system was synthesized by utilizing a self-developed electronic control unit (ECU), a PCI-1711 multi-functional data acquisition board as well as the previously developed quarter-car simulation model. Road-friendliness of a semi-active suspension system controlled by the proposed control strategy was simulated via the HIL system using Dynamic Load Coefficient (DLC) and Dynamic Load Stress Factor (DLSF) criteria. Results: Compared to a passive suspension, a semi-active suspension system based on the fuzzy hybrid control strategy reduced the DLC and DLSF values. Conclusions: The proposed control strategy of semi-active suspension systems can be employed to improve road-friendliness of road vehicles.

Semi-Active Control for Improving Ride Comfort in Railway Vehicle by MR Damper (MR 댐퍼를 이용한 철도차량 승차감 반능동 제어)

  • Shin, Yu-Jeong;You, Won-Hee;Jung, Heung-Chae
    • Proceedings of the KSR Conference
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    • 2011.10a
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    • pp.1929-1934
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    • 2011
  • Recently the maximum speed becomes the most important performance in high speed train. But the speed up of train will not give the passenger good riding comfort. The semi-active suspension system by using variable damper with hydraulic solenoid valve is used to solve this problem. But the variable damper with hydraulic solenoid valve requires tank for supplying fluid. In this study, the MR(Magneto Rheological) damper was considered instead of hydraulic variable damper in order to improve riding comfort. Dynamic simulation was conducted for semi-active suspension system with MR damper was made by using Matlab-Simulink S/W. According to control strategy of MR damper for improving ride comfort in railway vehicle, The riding comfort of the railway vehicle with semi-active suspension system was analyzed and compared with conventional suspension system by using the program.

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A Study on the Appication of Semi-Active Supension Units for a Combat Vehicle by Using HILS (HILS를 활용한 전투차량의 반능동 현수장치 적용에 관한 연구)

  • Kim, Chi-Ung;Kim, Moon-June;Rhee, Eun-Jun;Lee, Kyoung-Hoon;Woo, Kwan-Je
    • Journal of the Korea Institute of Military Science and Technology
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    • v.13 no.6
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    • pp.967-975
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    • 2010
  • There have been a lot of efforts on the improvement for the ride comfort and handling stability of the combat vehicles. Especially most of vehicles for military purpose have bad inertial condition and severe operating condition such as the rough road driving, and need a high mobility in the emergency status. It is necessary to apply the controlled suspension system in order to improve the vehicle mobile stability and ride comfort ability of crews. A feasibility study is performed on the application of the semi-active suspension system with a magneto-rheological controlled shock absorber for a $6{\times}6$ combat vehicle. First, the dynamic simulation model of the vehicle including the control model for the semi-active suspension system was executed. Based on this model, a hardware-in-the-loop simulation(HILS) system which has a semi-active suspension controller hardware was constructed. After full vehicle simulations were performed in virtual proving courses with this system, the semi-active suspension system was proven to give better ride comfort and handling stability in comparison with the conventional passive suspension system.

Integrated cable vibration control system using Arduino

  • Jeong, Seunghoo;Lee, Junhwa;Cho, Soojin;Sim, Sung-Han
    • Smart Structures and Systems
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    • v.23 no.6
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    • pp.695-702
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    • 2019
  • The number of cable-stayed bridges has been increasing worldwide, causing issues in maintaining the structural safety and integrity of bridges. The stay cable, one of the most critical members in cable-stayed bridges, is vulnerable to wind-induced vibrations owing to its inherent low damping capacity. Thus, vibration mitigation of stay cables has been an important issue both in academia and practice. While a semi-active control scheme shows effective vibration reduction compared to a passive control scheme, real-world applications are quite limited because it requires complicated equipment, including for data acquisition, and power supply. This study aims to develop an Arduino-based integrated cable vibration control system implementing a semi-active control algorithm. The integrated control system is built on the low-cost, low-power Arduino platform, embedding a semi-active control algorithm. A MEMS accelerometer is installed in the platform to conduct a state feedback for the semi-active control. The Linear Quadratic Gaussian control is applied to estimate a cable state and obtain a control gain, and the clipped optimal algorithm is implemented to control the damping device. This study selects the magnetorheological damper as a semi-active damping device, controlled by the proposed control system. The developed integrated system is applied to a laboratory size cable with a series of experimental studies for identifying the effect of the system on cable vibration reduction. The semi-active control embedded in the integrated system is compared with free and passive mode cases and is shown to reduce the vibration of stay-cables effectively.

Neuro-Control of Seismically Excited Structures using Semi-active MR Fluid Damper (반능동 MR 유체 감쇠기를 이용한 지진하중을 받는 구조물의 신경망제어)

  • 이헌재;정형조;오주원;이인원
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2002.10a
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    • pp.313-320
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    • 2002
  • A new semi-active control strategy for seismic response reduction using a neuro-controller and a magnetorheological (MR) fluid damper is proposed. The proposed control system consists of the improved neuro-controller and the bang-bang-type controller. The improved neuro-controller, which was developed by employing the training algorithm based on a cost function and the sensitivity evaluation algorithm replacing an emulator neural network, produces the desired active control force, and then the bang-bang-type controller causes the MR fluid damper to generate the desired control force, so long as this force is dissipative. In numerical simulation, a three-story building structure is semi-actively controlled by the trained neural network under the historical earthquake records. The simulation results show that the proposed semi-active neuro-control algorithm is quite effective to reduce seismic responses. In addition, the semi-active control system using MR fluid dampers has many attractive features, such as the bounded-input, bounded-output stability and small energy requirements. The results of this investigation, therefore, indicate that the proposed semi-active neuro-control strategy using MR fluid dampers could be effectively used for control of seismically excited structures.

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Vehicle dynamic analysis of continuously controlled semi-active suspension using hardware-in-the-loop simulation (Hardware-in-the-loop 시뮬레이션을 이용한 연속 가변식 반능동 현가 시스템의 차량 동역학적 해석)

  • 황성호;허승진;이교일
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10b
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    • pp.1107-1112
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    • 1996
  • A semi-active suspension system with continuously variable damper is greatly expected to be mainly used in the future as a high-performance suspension system due to its cost-effectiveness, light weight, and low energy consumption. To develop the suitable control logic for the semi-active suspension system, the hardware-in-the-loop simulation is performed with the experimental continuously variable damper combined with a quarter-car model. The hardware-in-the-loop simulation results are compared for passive, on/off controlled, and continuously controlled dampers in the aspects of ride comfort and driving safety, assuming each damper to be installed on a vehicle.

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LQC Control for Semi-Active Suspension Systems with Road-Adaptation (노면추정을 통한 반능동 현가시스템의 LQG 제어)

  • 손현철;홍경태;홍금식
    • Journal of Institute of Control, Robotics and Systems
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    • v.9 no.9
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    • pp.669-678
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    • 2003
  • A road-adaptive LQG control for the semi-active Macpherson strut suspension system of hydraulic type is investigated. A new control-oriented model, which incorporates the rotational motion of the unsprung mass, is used for control system design. First, based on the extended least squares estimation algorithm, a LQG controller adapting to the estimated road characteristics is designed. With computer simulations, the performance of the proposed LQC-controlled semi-active suspension is compared with that of a non-adaptive one. The results show better control performance of the proposed system over the compared one.

Performance Investigation of Variable Damping Shock Attenuation Logic (가변 감쇠를 이용한 충격제어기법의 성능분석)

  • Oh, Hyun-Ung
    • Journal of Aerospace System Engineering
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    • v.7 no.1
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    • pp.1-7
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    • 2013
  • Launch vehicles cause several shock events during their lift-off. The excessive shock loads in the several thousands of g's level can results in permanent damage to electronics, optics and other sensitive payload components. The shock can be attenuated by mounting a shock absorber. In this paper, we proposed a semi-active control logic to attenuate the shock so that the input acceleration to main instruments does not exceed the allowable maximum acceleration value. For the performance investigation, two elements model of variable damping and spring stiffness has been used and the analysis results indicate that the proposed semi-active control logic attenuates shock level better than an optimal passive and conventional semi-active on-off control system.