• 제목/요약/키워드: Vehicle suspension system

검색결과 454건 처리시간 0.025초

신경망을 이용한 현가시스템의 모델링 및 고장 진단에 관한 연구 (A Study on Modeling and Fault Diagnosis of Suspension Systems Using Neural Network)

  • 이정호;박기홍;허승진
    • 한국자동차공학회논문집
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    • 제11권1호
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    • pp.95-103
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    • 2003
  • Driving safety of a vehicle is largely influenced by the damper and the tire. Developed in this research is a fault diagnosis algorithm for the two components so that the driver can be promptly informed when fault occurs in one or both of them. To this end, the damper and the tire were modeled using the neural network from their experimental data, and fault diagnosis was made using frequency responses of the damping force and the dynamic wheel force. The algorithm was tested via experiments, and it demonstrated successful diagnostic performance under various driving conditions.

Active Control of Road-Booming-Noise with Constraint Multiple Filtered-X LMS Algorithm

  • Oh, Shi-Hwan;Kim, Hyoun-Suk;Park, Young-Jin
    • The Journal of the Acoustical Society of Korea
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    • 제19권2E호
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    • pp.3-7
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    • 2000
  • Vibration generated by the non-uniform road profile propagates though each tire and the suspension and finally generates structure born noise in the interior of the passenger vehicle. In this paper, the road-booming-noise which has strong correlation with the vibration signals measured at the suspension system was compensated. Active noise control of the road-booming-noise is rather difficult to achieve because of its non-stationary characteristics. CMFX LMS (Constraint Multiple Filtered-X Least Mean Square) algorithm, which can track non-stationary process rather well, is applied. Comprison of the proposed method and the conventional MFX LMS (Multiple Filtered-X Least Mean Square) algorithm is made through the hardware-in-the-loop simulation and the feasibility of the proposed method is demonstrated with the experiment.

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Effect of Active Suspension Unit with $H{\infty}$ Robust Controller on the Vehicle Dynamics Performances

  • Kanbolat, Ahmet;Okuyama, Yoshifumi;Takemori, Fumiaki
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1995년도 Proceedings of the Korea Automation Control Conference, 10th (KACC); Seoul, Korea; 23-25 Oct. 1995
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    • pp.356-359
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    • 1995
  • This paper uses a new method to improve the performance criterion of an active suspension car. The used control strategy is based on robust H$_{\infty}$ control theory taking into consideration the chasis flexibility. It will be shown that the modeling errors can be lumped into an unstructured uncertainty and the robust controller designed in the presence of these perturbations could maintain the stability and performance even for the controlled true system..

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개념적 관점에서 차세대고속철도차량의 현가요소 특성 분석 (Analysis of the Suspension Characteristics for Next generation High Speed Train on the View of Concept Design)

  • 박찬경;김영국;김기환
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2008년도 춘계학술대회 논문집
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    • pp.835-840
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    • 2008
  • Next Generation High Speed Train having a distributed electrical motor system has just been developing to aim the experimental maximum speed at 400km/h since August, 2007. This project is in stage of concept design and so, it needs to take some review and analysis the characteristics of suspensions on the view of concept design. A vehicle modeling is made of modified Korean High Speed Train bogie model with Vampire program and analyzed the effect on the dynamic performances according to the variation of primary and secondary suspension characteristics. The results would be useful to manage the potential risks in the next stage of basic and precision design that will be done by the manufacturing company.

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소형 초전도 부상자석의 특성 연구 (Study on the Characteristics of a Small Scale HTSC Levitation Magnet)

  • 조흥제;배덕권;이종민;고태국
    • 한국초전도ㆍ저온공학회논문지
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    • 제9권1호
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    • pp.76-81
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    • 2007
  • This paper deals with the characteristics of a small scale $high-T_c$ superconducting(HTSC) levitation system. The levitation tester. which models after electrodynamic suspension(EDS) maglev, consists of one HTSC magnet, a reaction plate, and force measuring components. Instead of moving magnet, AC current was applied to the fixed HTSC magnet. The magnet also has persistent current switch(PCS). The inductance of the magnet was 18.5 mH and total joint resistance of the magnet was $5.74{\times}10^{-7}\Omega$. AC current was applied into the HTSC magnet with various frequencies and the levitation force was calculated and measured. According to the increase of the vehicle speed, the levitation force was saturated.

가이드웨이 진동 특성이 자기부상열차 동특성에 미치는 영향 (Effects of Guideway's Vibration Characteristics on Dynamics of a Maglev Vehicle)

  • 한형석;임봉혁;이남진;허영철;권정일
    • 한국소음진동공학회논문집
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    • 제18권3호
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    • pp.299-306
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    • 2008
  • The electromagnet in Maglev vehicles controls the voltage in its winding to maintain the air gap, a clearance between the electromagnet and guideway, within an allowable deviation, with strongly interacting with the flexible guideway. Thus, the vibration characteristics of guideway plays important role in dynamics of Maglev vehicles using electromagnet as an active suspension system. The effects of the guideway's vibrational characteristics on dynamics of the Maglev vehicle UTM-01 are analyzed. The coupled equations of motion of the vehicle/guideway with 3 DOFs are derived. Eigenvalues are calculated and frequency response analysis is also performed for a clear understanding of the dynamic characteristics due to guideway vibration characteristics. To verify the results, tests of the urban Mgalev vehicle UTM-02 are carried out. It is recommended that the natural frequency of the guideway be minimized and its damping ratio in the Maglev vehicle with a 5-states feedback control law as a levitation control law.

가이드웨이 유연성이 고려된 자기부상열차 부상제어 시뮬레이션 (Levitation Control Simulation of a Maglev Vehicle Considering Guideway Flexibility)

  • 한종부;임재원;김창현;한형석;김성수
    • 한국철도학회논문집
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    • 제18권1호
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    • pp.15-24
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    • 2015
  • 상전도흡인식 자기부상열차는 전자석의 전류를 조정하여 차량과 선로 사이의 간극(공극)을 일정하게 유지한다. 이러한 능동현가장치를 사용하는 자기부상열차에 있어서는 다양한 외란에도 불구하고 부상제어기를 이용한 부상공극을 허용하는 범위 내로 유지하는 것이 핵심기술 중의 하나이다. 특히 차량과 유연한 가이드웨이 사이의 동적상호작용에 의해 발생되는 진동은 저속 및 정지상태에서 부상안정성을 방해하는 중요한 요인으로 작용한다. 본 논문에서는 가이드웨이의 유연성에도 강인한 부상제어기를 개발하기 위하여 차량과 유연 가이드웨이 사이의 연성 동역학 모델을 개발하고, 전자석 및 부상제어기도 포함시키는 통합모델링을 제안하였다. 개발된 통합동역학 모델을 이용하여 가이드웨이의 유연성을 고려한 부상공극 시뮬레이션을 수행하였다.

차량 능동 현가장치 용 수압 액추에이터에 대한 비선형 제어 (Nonlinear Control of a Hydraulic Actuator for Vehicle Active Suspensions)

  • 천종민;김석주;이종무;김춘경;권순만
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 제36회 하계학술대회 논문집 D
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    • pp.2534-2536
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    • 2005
  • In this paper, we apply sliding control law to a nonlinear electro-hydraulic suspension system. The force the actuator must track is determined by the skyhook control law and the desired force value varies according to the road situation. The road frequencies can inform us of the current road situation. Detecting the road frequencies, we use the Fourier Transform.

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판 스프링의 비선형 동특성 해석 (Finite Element Modeling and Analysis of Nonlinear Dynamic characterisics of Leaf spring)

  • 임홍재;권영일
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1996년도 춘계학술대회 논문집
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    • pp.842-846
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    • 1996
  • Leaf springs are widely used as a major suspension component in many commercial vehicles, such as buses, trucks, etc. They have a complex dynamic behavior due to the geometric nonlinear and the contact mechanism between the leaves. The interface conditions between the leaves play a significant role in the global behavior of the comfort and ride of the vehicle system. The paper concentrates on modeling leaf springs and contact frictions between the leaves using a nonlinear finite element approach. A nonlinear load-displacement hysteresis curve for the leaf spring is simulated and its results are compared with test results.

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