• Title/Summary/Keyword: Vehicle Dynamic Control System

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Performance Evaluation of 6WD Military Vehicle Featuring MR Damper (MR 댐퍼를 적용한 6WD 군용차량의 성능평가)

  • Ha, Sung-Boon;Choi, Seung-Bok;Rhee, Eun-Jun;Kang, Pil-Soon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2008.11a
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    • pp.460-465
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    • 2008
  • This paper proposes a new type of MR (magentorheological) fluid based suspension system and applies it to military vehicle for vibration control. The suspension system consists of gas spring and MR damper. The nonlinear behavior of spring characteristics is evaluated with respect to the wheel travel and damping force model due to viscosity and yield stress of MR fluid is derived. Subsequently, a military vehicle of 6WD is adopted for the integration of the MR suspension system and its nonlinear dynamic model is establishes by considering vertical, pitch and roll motion. Then, a sky-hook controller associated with semi-active actuating condition is designed to reduce the vibration. In order to demonstrate the effectiveness of the proposed MR suspension system, computer simulation is undertaken showing vibration control performance such as roll angle and pitch angle evaluated under bump and random road profiles.

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Performance Evaluation of 6WD Military Vehicle Featuring MR Damper (MR댐퍼를 적용한 6WD 군용차량의 성능평가)

  • Ha, Sung-Hoon;Choi, Seung-Bok;Rhee, Eun-Jun;Kang, Pil-Soon
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.19 no.1
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    • pp.17-23
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    • 2009
  • This paper proposes a new type of MR(magnetorheological) fluid based suspension system and applies it to military vehicle for vibration control. The suspension system consists of gas spring and MR damper. The nonlinear behavior of spring characteristics is evaluated with respect to the wheel travel and damping force model due to viscosity and yield stress of MR fluid is derived. Subsequently, a military vehicle of 6WD is adopted for the integration of the MR suspension system and its nonlinear dynamic model is established by considering vertical, pitch and roll motion. Then, a sky-hook controller associated with semi-active actuating condition is designed to reduce the imposed vibration. In order to demonstrate the effectiveness of the proposed MR suspension system, computer simulation is undertaken showing vibration control performance such as roll angle and pitch angle evaluated under bump and random road profiles.

Development of A Hybrid Type Electronic Brake System(EBS)

  • Lim, Chulki;Boo, Kwangsuck;Song, Jeonghoon;Hong, Soonyoung
    • 제어로봇시스템학회:학술대회논문집
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    • 2002.10a
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    • pp.115.1-115
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    • 2002
  • This study proposes a new conceptual Hybrid Electric Brake System (HEBS) which overcomes the problems of the conventional hydraulic brake system. The HEBS uses the contactless brake system when vehicle speed is high to obtain superior braking force by eddy current, which is induced in pole area by magnetic flux through a rotating conductive disk. On the contrary, when a vehicle speed is low, contact type brake system such as conventional hydraulic brake system makes higher braking force. HEBS transfers faster a braking intention of drivers and guarantees a safety of drivers because of vehicle dynamic superior controllability. Braking torque analysis is peformed based upon Lee. Barn\ulcornermath...

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Worst Case Scenario Generation on Vehicle Dynamic Stability and Its Application (주행 안정성을 고려한 최악 상황 시나리오 도출 및 적용)

  • Jung, Dae-Yi;Jung, Do-Hyun;Moon, Ki-Hyun;Jeong, Chang-Hyun;Noh, Ki-Han;Choi, Hyung-Jeen
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.6
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    • pp.1-9
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    • 2008
  • The current test methods are insufficient to evaluate and ensure the safety and reliability of vehicle system for all possible dynamic situation including the worst case such as rollover, spin-out and so on. Although the known NHTSA J-turn and Fish-hook steering maneuvers are applied for the vehicle performance assessment, they aren't enough to estimate other possible worst case scenarios. Therefore, it is crucial for us to verify the various worst cases including the existing severe steering maneuvers. This paper includes the procedure to search for other useful worst case based upon the existing worst case scenarios mentioned above and its application in simulation basis. The only human steering angle is selected as a design parameter here and optimized to maximize the index function to be expressed in terms of either roll angle or yaw rate. The obtained scenarios were enough to generate the worst case to meet NHTSA worst case definition (ex.2-inch wheel lift). Additionally, as an application, the worst case steering maneuver is acquired for the vehicle to operate with a simple ESP system. It has been concluded that the new procedure in this paper is adequate to create other feasible worst case scenarios for a vehicle system both with an intelligent safety control system and without it.

On the Pressurization System for a Launch Vehicle (우주발사체 가압시스템 설계)

  • Hong, Moon-Geun;Chung, Yong-Gahp;Kim, Young-Mog
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2006.11a
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    • pp.113-115
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    • 2006
  • Consulting Stout & Snell's paper[1], design approaches for the pressurization system for a launch vehicle are introduced. We have outlined the typical system requirements and a dynamic model of the pressurization system. A brief summary on the control loop design for multiple on-off valve control systems has been also presented.

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Experimental Performance Analysis and Vibration Control of Commercial Vehicle Seat Suspension System Using ER Seat Damper (ER시트댐퍼를 사용한 상용차운전석의 실험적 성능해석 및 진동제어)

    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.7 no.3
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    • pp.7-13
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    • 1998
  • This paper presents a new concept of a commercial vehicle seat suspension system. The proposed suspension system features an ER(electro-rheological)damper which can produce continuously tunable damping forces by control elecric fields. A dynamic model of the ER damper is first achieved by incorporating Bingham property of the ER fluid, followed by the formulation of governing equations of motion for the suspension system The effectiveness of the proposed ER seat suspension system is evaluated by investigating vibration with respect to sinusoidal inputs.

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A Study on the Automotive Suspension System for Energy Efficiency (에너지 절감형 자동차용 현가장치에 관한 연구)

  • 소상균
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.3
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    • pp.100-107
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    • 2001
  • The main goals of the automotive suspension systems are to isolate roadway unevenness from the tire and to improve vehicle stability. To overcome the performance limitation of the passive systems the active systems which completely replace the passive spring and damper elements with a force generating actuator has been studied. However, application of the system has been limited because it has required a significant amount of power. Recently, alternative systems which retain passive elements but include active elements have been developed to reduce the power required. Those systems are mostly focused on the control system which compresses the spring-damper directly. In this study, a new type of power efficient control system which makes the spring-damper unit slide in side way is studied. After constructing the control system including dynamic modeling and motion control, two types of alternative control systems are compared in view of power consumption and dynamic attitudes such as roll responses as well as heave responses. Also, a half car bond graph model is developed to show clearly the significant differences in performances between two control systems.

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Three-dimensional trajectory tracking for underactuated AUVs with bio-inspired velocity regulation

  • Zhou, Jiajia;Ye, Dingqi;Zhao, Junpeng;He, Dongxu
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.10 no.3
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    • pp.282-293
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    • 2018
  • This paper attempts to address the motion parameter skip problem associated with three-dimensional trajectory tracking of an underactuated Autonomous Underwater Vehicle (AUV) using backstepping-based control, due to the unsmoothness of tracking trajectory. Through kinematics concepts, a three-dimensional dynamic velocity regulation controller is derived. This controller makes use of the surge and angular velocity errors with bio-inspired models and backstepping techniques. It overcomes the frequently occurring problem of parameter skip at inflection point existing in backstepping tracking control method and increases system robustness. Moreover, the proposed method can effectively avoid the singularity problem in backstepping control of virtual velocity error. The control system is proved to be uniformly ultimately bounded using Lyapunov stability theory. Simulation results illustrate the effectiveness and efficiency of the developed controller, which can realize accurate three-dimensional trajectory tracking for an underactuated AUV with constant external disturbances.

Design, Implementation and Test of New System Software Architecture for Autonomous Underwater Robotic Vehicle, ODIN-III (시험용 자율 무인 잠수정, ODIN-III의 새로운 시스템 소프트웨어 구조의 설계와 구현 및 실험)

  • 최현택;김진현;여준구;김홍록;서일홍
    • Journal of Institute of Control, Robotics and Systems
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    • v.10 no.5
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    • pp.442-449
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    • 2004
  • As underwater robotic vehicles (URVs) become attractive for more sophisticated underwater tasks, the demand of high performance in terms of accuracy and dexterity has been increased. An autonomous underwater robotic vehicle, ODIN (Omni-Directional Intelligent Navigator) was designed and built at the Autonomous Systems Laboratory of the University of Hawaii in 1991. Since 1991, various studies were conducted on ODIN and have contributed to the advancement in underwater robotics. Its refurbished model ODIN II was based on VxWorks in VMEbus. Recently, ODIN was born again as a PC based system, ODIN III with unique features such as new vehicle system software architecture with an objective-oriented concept, a graphical user interface, and an independent and modular structure using a Dynamic Linking Library (DLL) based on the Windows operating system. ODIN III software architecture offers an ideal environment where various studies for advanced URV technology can be conducted. This paper describes software architecture of ODIN III and presents initial experimental results of fine motion control on ODIN III.

A Study on Performance Improvement of Hybrid Energy Storage System for Mild HEV (마일드 하이브리드 차량용 복합형 에너지 저장장치의 성능개선에 관한 연구)

  • Lee, Back-Haeng;Shin, Dong-Hyun;Kim, Hee-Jun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.10
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    • pp.1763-1769
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    • 2007
  • To improve the cycle-life and efficiency of an energy storage system for HEV, a dynamic control system consisted of a switch between a battery and an ultracapacitor module is proposed, which is appropriate for mild hybrid vehicle with 42V power net. The switch can be controlled based on the status of the battery and the ultracapacitor module, and a control algorithm that could largely decrease the number of high charging current peak is also implemented. Therefore the cycle life of the battery can be improved such that it is suitable for a mild hybrid vehicle with frequent engine start-stop and regenerative-braking. Also, by maximizing the use of the ultracapacitor, the system efficiency during high current charging and discharging operation is improved. Finally, this system has the effects that improves the efficiency of energy storage system and reduces the fuel consumption of a vehicle. To verify the validity of the proposed system, this paper presented cycles test results of different energy storage systems: a simple VRLA battery, hybrid energy Pack (HEP, a VRLA battery in Parallel with Ultracapacitor) and a HEP with a switch that controlled by energy management system (EMS). From the experimental result, it was proved the effectiveness of the algorithm.