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하성훈(Ha, Sung-Hoon),최승복(Choi, Seung-Bok),유원희(You, Won-Hee) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.7
This paper presents vibration control performances and stability evaluations of railway vehicle featuring controllable magnetorheological(MR) damper. The MR damper model is developed and then incorporated with the governing equations of motion of the railway vehicle which includes vehicle body, bogie and wheel-set. A cylindrical type of MR damper is devised and its damping force is evaluated by considering fluid viscosity and MR effect Design parameters are determined to achieve desired damping force level applicable to real railway vehicle. Subsequently, computer simulation of vibration control and stability analysis is performed using Matlab Simulink.
하성훈(Ha, Sung-Hoon),최승복(Choi, Seung-Bok),이은준(Rhee, Eun-Jun),강필순(Kang, Pil-Soon) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.1
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.
MR댐퍼를 이용한 철도 차량의 진동제어 및 조향성능 고찰
하성훈(Ha, Sung-Hoon),최승복(Choi, Seung-Bok),유원희(You, Won-Hee) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.5
This paper presents yaw vibration control performances of railway vehicle featuring controllable magnetorheological damper. A cylindrical type of MR damper is devised and its damping force is evaluated by considering fluid resistance and MR effect. Design parameters are determined to achieve desired damping force level. The MR damper model is then incorporated with the governing equations of motion of the railway vehicle which includes vehicle body, bogie and wheel-set. Subsequently, computer simulation of vibration control via proportional-integral-derivative(PID) controller is performed using Matlab. Various control performances are demonstrated under external excitation by creep force between wheel and rail.
접시 스프링과 MR Valve를 적용한 군용차량 현수장치의 모델링
하성훈(Ha, Sung-Hoon),최승복(Choi, Seung-Bok),이은준(Rhee, Eun-Jun),강필순(Kang, Pil-Soon) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.10
This paper presents a dynamic modeling of a military vehicle suspension featuring disc spring and MR valve. Firstly, the dynamic model of the disc spring is established with respect to the load and pressure. The nonlinear behavior of the spring is incorporated with the model. Secondly, the dynamic model of the MR valve is derived by considering the pressure drop due to the viscosity and yield stress of MR fluid. The governing characteristics of the proposed suspension system are then investigated by presenting the field-dependent pressure drop of the MR valve and spring force of the gas spring.
하성훈(Ha, Sung-Hoon),최승복(Choi, Seung-Bok),이은준(Rhee, Eun-Jun),강필순(Kang, Pil-Soon) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.1
This paper presents dynamic modeling and control analysis of a military vehicle suspension featuring MR valve structure. Firstly, the dynamic model of the suspension system which is included gas spring, MR valve and gas chamber is established with respect to the disturbance. Secondly, the friction model of the suspension system is derived by considering experiment result of the MR suspension system. And then, response characteristics of the damping force with respect to the magnetic field and friction force with the proposed friction model are provided to show the feasibility of practical application. In addition, control performance of the proposed MR suspension system is evaluated with quarter vehicle.
하성훈(Ha, Sung-Hoon),김형섭(Kim, Hyung-Seob),최승복(Choi, Seung-Bok),우제관(Woo, Je-Kwan) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.6
This paper presents optimal design of controllable magnetorheological suspension unit for a tracked vehicle. As a first step, a double-rod type MR suspension unit is designed on the basis of the Bingham model of commercially available MR fluid, and its damping characteristics are evaluated with respect to the intensity of the magnetic field. Subsequently, the governing equation of motion of the MR suspension system featuring the MR valve is established. Then, the optimization problem to find optimal geometric dimensions of the MR supension unit is formulated by considering an objective function which is related to damping torque and control energy. The first order optimization method intergrated with a commercial finite element method(FEM) software is adopted to obtain optimal solution of the system. The performance characteristics of the optimized MR susepnsion unit is then evaluated and compared with initial one.
하성훈(Ha, Sung-Hoon),성민상(Seong, Min-Sang),구오흥(Heung, Quoc-Nguyen),최승복(Choi, Seung-Bok) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.11
This paper presents an optimal design of magnetorheological(MR) damper based on analytical methodology and finite element analysis. The proposed MR damper consists of MR valve and gas chamber. The MR valve is constrained in a specific volume and the optimization problem identifies geometric dimensions of the valve structure that maximize the pressure drop of the MR valve or damping force of the MR damper. In this work, the single-coil annular MR valve structure is considered. After describing the schematic configuration and operating principle of MR valve and damper, a quasi-static model is derived based on Bingham model of MR fluid. The magnetic circuit of the valve and damper is then analyzed by applying the Kirchoff' s law and magnetic flux conservation rule. Based on the quasi-static modeling and the magnetic circuit analysis, the optimization problem of the MR valve and damper is built. The optimal solution of the optimization problem of the MR valve structure constrained in a specific volume is then obtained and compared with the solution obtained from finite element method.