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이종우(Jong-Woo Lee),성민상(Min-Sang Seong),우제관(Je-Kwan Woo),최승복(Seung-Bok Choi) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.10
This paper presents a new small-sized damper featuring magneto-rheological (MR) fluid which can be applied to vibration control system. The proposed MR damper consists of cylinder, piston, a couple of bearings, oil-seals and magnetic circuit which has two coils. In this damper, approximately 5cc of MR fluid is used. The damping force of the MR damper is designed to be followed by linear shear-mode Bingham-plastic model. In order to verify the performance of the MR damper, an experimental apparatus is established. In the experimental test, the damping force of the MR damper is measured with respect to time, displacement and velocity. In addition, the time response of MR damper is measured when 1A of step current is applied. Finally, The proposed small MR damper is applied to vibration control. In this process, a simple 1-DOF system is modeled and controlled using PID controller.
이종우(Lee, Jong-Woo),성민상(Seong, Min-Sang),우제관(Woo, Je-Kwan),최승복(Choi, Seung-Bok) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.11
This paper presents a new small-sized damper featuring magneto-rheological(MR) fluid which can be applied to vibration control system. The proposed MR damper consists of cylinder, piston, a couple of bearings, oil-seals and magnetic circuit which has two coils. In this damper, approximately 5cc of MR fluid is used. The damping force of the MR damper is designed to be followed by linear shear-mode Bingham-plastic model. In order to verify the performance of the MR damper, an experimental apparatus is established. In the experimental test, the damping force of the MR damper is measured with respect to time, displacement and velocity. In addition, the time response of MR damper is measured when 1A of step current is applied. Finally, the proposed small MR damper is applied to vibration control. In this process, a simple 1-DOF system is modeled and controlled using PID controller.
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.
Optimal Design of New Magnetorheological Mount for Diesel Engines of Ships
도쑤웬푸(Do, Xuan-Phu),박준희(Park, Joon-Hee),우제관(Woo, Jae-Kwan),최승복(Choi, Seung-Bok) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.3
This paper presents an optimal design of a magnetorheological(MR) fluid-based mount(MR mount) that can be used for to vibration control in diesel engines of ships. In this work, a mount that uses mixed-modes(squeeze mode, flow mode, and shear mode) is proposed and designed. To determine the actuating damping force of the MR mount required for efficient vibration control, the excitation force from a diesel engine is analyzed. In this analysis, a model of a V-type engine is considered. The relationship between the velocity and pressure of gas in terms of the torque acting on the piston is derived. Subsequently, by integrating the field-dependent rheological properties of commercially available MR fluid with the excitation force, the appropriate size of the MR mount is designed. In addition, to achieve the maximum actuating force under geometric constraints, design optimization is undertaken using the ANSYS parametric design language software. Through magnetic density analysis, optimal design parameters such as the bottom gap and radius of coil are determined.
Optimal Design of New MR Mount for Diesel Engine of Ship
Xuan-Phu Do(도쑤웬푸),Joon-Hee Park(박준희),Jae-Kwan Woo(우제관),Seung-Bok Choi(최승복) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.10
이 논문은 선박디젤엔진의 진동제어에 적용할 수 있는 MR 유체기반 마운트(MR 마운트)의 최적설계를 제시한다. 이 연구에서는 압착모드, 유동모드, 전단모드를 포함하는 혼합모드가 제안되었고 설계되었다. 효과적인 진동제어를 위하여 요구되는 MR 마운트의 작동 댐핑력을 결정하기 위하여 디젤엔진의 기진력이 분석되었다. 이 분석에서 V-type 엔진이 고려되었으며 피스톤의 토크에서의 속도와 가스압력간의 관계를 유도하였다. 결과적으로 상업적으로 이용 가능한 MR 유체의 장의존적 유동특성과 기진력을 통합함으로써 적절한 MR 마운트의 크기가 설계되었다. 게다가 기하학적 제한조건이 고려된 최대 구동력을 얻기 위해 ANSYS 를 이용하여 최적설계가 수행되었다. 자기밀도분석을 통해 바닥간격과 코일의 반지름과 같은 최적설계변수가 결정되었다. This paper presents an optimal design of magnetorheological (MR) fluid based mount (MR mount in short) which can be applicable to vibration control of diesel engine of ship. In this work, a mixed - mode including squeeze mode, flow mode and shear mode is proposed and designed. In order to determine actuating damping force of MR mount required for efficient vibration control, excitation force from diesel engine is analyzed. In this analysis, a model of V-type engine is considered and the relationship between velocity and pressure of gas in torque of the piston is derived. Subsequently, by integrating the field-dependent rheological properties of commercially available MR fluid with the excitation force an appropriate size of MR mount is designed. In addition, in order to achieve maximum actuating force with geometric constraints design optimization is undertaken using ANSYS software. Through the magnetic density analysis, optimal design parameters such as bottom gap and radius of coil are determined.
박영기(Park Young-Gee),하성훈(Ha Sung Hoon),우제관(Woo Jae Kwan),최승복(Choi Seung-Bok),김현(Kim-Hyun) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.4
This paper presents experimental evaluation of IRB (isolation roller bearing) seismic isolation device. From the combination of base isolation on the IRB system displacement response spectrum and acceleration response spectrum, the compressive strength and the coefficient of friction experiments. Also the IRB system is evaluated by environment test according to KS standards. Both the resonance and seismic experiments using a combination of the IRB and Natural Rubber Bearing (NRB) are performed in order to analyze the seismic isolation of the IRB system dynamic characteristics. For the given load and exciting frequency, the resonant frequency becomes lower, but the resonant magnification remains to be same. However, it is shown that when we consider the IRB only, the vibration on the table with the horizontal movement and the independent horizontal displacement due to the rolling motion of the plate and roller are significantly reduced. This result verifies that the proposed optimal design method of the IRB system is very effective.
성민상(Seong, Min-Sang),임승구(Lim, Seung-Gu),최승복(Choi, Seung-Bok),김철호(Kim, Cheol-Ho),우제관(Woo, Je-Kwan) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.11
This paper presents design and performance evaluation of magnetorheological(MR) damper for integrated isolation mount. The MR damper needs two functions for the integrated isolation mount. The one is vibration absorption and the other is isolation of vibration transmission. For vibration absorption, the MR damper requires wide damping force range. And for isolation of vibration transmission, the friction of MR damper needs to be eliminated. In order to achieve this goal, a novel type of MR damper is originally designed in this work. Subsequently, the MR damper is mathematically modeled and its damping force characteristics are evaluated. In addition, the vibration control performance of the MR damper associated with the stage mass is evaluated. From the result, this paper evaluates the performance of MR damper for integrated isolation mount.
성민상(Seong, Min-Sang),최승복(Choi, Seung-Bok),김철호(Kim, Cheol-Ho),이홍기(Lee, Hong-Ki),백재호(Baek, Jae-Ho),한현희(Han, Hyun-Hee),우제관(Woo, Je-Kwan) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.12
This paper presents experimental performance evaluation of a magnetorheological(MR) damper for integrated isolation mount for ultra-precision manufacturing system. The vibration sources of the ultra-precision manufacturing system can be classified as follows: the one is the environmental vibration from the floor and the other is the transient vibration occurred from stage moving. The transient vibration occurred from the stage moving has serious adverse effect to the process because the vibration scale is quite larger than other vibrations. Therefore in this research, a semi-active MR damper, which can control the transient vibration, is adopted. Also the stage needs to be isolated from tiny vibrations from the floor. For this purpose, a dry-frictionless MR damper is required. In order to achieve this goal, a novel type of MR damper is originally designed and manufactured in this work. Subsequently, the damping force characteristics of MR damper are evaluated by simulation and experiment. In addition, the vibration control performance of the MR damper associated with the stage mass is evaluated.