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Do Xuan Phu(도쑤웬푸),Jye Ung Chung(정제웅),Seung-Bok Choi(최승복) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
This paper presents a new design of adaptive fuzzy sliding mode control based two methodologies: H infinity control technique and sliding mode control. The sliding surface of sliding mode control is analyzed into two matrices: Hurwitz constants matrix and constant matrix. These matrices are basis for establishing the proposed control and subsequently are combined with H infinity technique method. The control from the combination of H infinity and sliding mode is reinforced by a new robustness function, which relates the previous control function and exponential function. In addition, a fuzzy logic model is integrated with the proposed algorithm to keep the advantages even in uncertain environment of the dynamic system. The proposed control is evaluated by magnetorheological (MR in short) seat damper system for vibration control. In addition, two existing controls are modified and compared with the proposed control to highlight some advantages of the proposed control scheme. It is demonstrated that from vibration control results the proposed control is much better performance than the existing two controllers.
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.
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.
박준희(Joon Hee Park),도쑤웬푸(Do Xuan Phu),구오흥(Nguyen Quoc Hung),강옥현(Ok Hyun Kang),최승복(Seung-Bok Choi) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.4
This paper presents optimal design procedures of mount based on a magnetorheological (MR) fluid to isolate the vibration in heavy diesel engine system. At first, frequency response and forcedisplacement transmissibility methods are used to get required damping force that is necessary for effective vibration isolation. From this result, a new type of high damping force engine mount is proposed and the governing equation of Bingham plastic behavior of MR fluid in flow path is mathematically derived under cylindrical coordinates. Finally, parametric design optimization featuring finite element is performed using ANSYS software to get the required damping force in MR mount system which can be used to reduce engine vibration. Damping force of the MR mount is then determined as an objective function in this analysis based on ANSYS. Furthermore, Magnetic analysis is then applied in this process.
박준희(Park, Joon Hee),도쑤웬푸(Do, Xuan Phu),구오흥(Nguyen, Quoc Hung),강옥현(Kang, Ok Hyun),최승복(Choi, Seung-Bok) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.5
This paper presents optimal design procedures of mount based on a magnetorheological(MR) fluid to isolate the vibration in heavy diesel engine system. At first, frequency response and force-displacement transmissibility methods are used to get required damping force that is necessary for effective vibration isolation. From this result, a new type of high damping force engine mount is proposed and the governing equation of Bingham plastic behavior of MR fluid in flow path is mathematically derived under cylindrical coordinates. Finally, parametric design optimization featuring finite element is performed using ANSYS software to get the required damping force in MR mount system which can be used to reduce engine vibration. Damping force of the MR mount is then determined as an objective function in this analysis based on ANSYS. Furthermore, Magnetic analysis is then applied in this process.