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정훈상,박영진 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.10
A novel concept of feedback loop design for modal test and model updating is proposed. This method uses the closed-loop natural frequency information for parameter modification to overcome the problems associated with the conventional method employing the modal sensitivity matrix. To obtain new modal information from closed-loop system, controllers should be effective in changing modal data while guaranteeing the stability of closed-loop system. But it is very hard to guarantee the stability of the closed-loop system with non-collocated sensor and actuator set. In this research, we proposed a controller called mode-decoupling controller that can change a target mode as much as the designer wants guaranteeing the stability of closed-loop system. This controller can be computed Just using measured open-loop modeshape matrix. A simulation based on time domain input/output data is performed to check the feasibility of proposed control method.
[동력전달계] 구동력 제어 시스템의 제어기 설계에 관한 연구
정훈상(Hunsang Jung),박영진(Youngjin Park) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
Excessive traction torque while starting on slippery roads and slopes causes the wheels to spin, consequently reducing the directional stability and the traction force. It may be a difficult task for normal drivers to steer under these conditions. To solve this problem, researches on the traction control system (TCS) that controls the traction torque using various vehicle pans have been conducted. But these commercial TCSs use experiential methods such as lookup table and gain-scheduling to achieve proper performance under various road and vehicle conditions. This paper proposes a novel brake torque controller .which is insensitive to the variation of vehicle mass, brake gain and road conditions. and throttle angle controller using multiple sliding mode based on the engine model. Through the hybrid use of two controllers, the suggested controller could gain traction force and directional stability.
정훈상(Jung, Hunsang),박영진(Park, Youngjin) 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.9
Parameter modification of a linear finite element model(FEM) based on modal sensitivity matrix is usually performed through an effort to match FEM modal data to experimental ones. However, there are cases where this method can't be applied successfully; lack of reliable modal data and ill-conditioning of the modal sensitivity matrix constitute such cases. In this research, a novel concept of introducing feedback loops to the conventional modal test setup is proposed. This method uses closed-loop natural frequency data for parameter modification to overcome the problems associated with the conventional method based on modal sensitivity matrix. We proposed the whole procedure of parameter modification using the closed-loop natural frequency data including the modal sensitivity modification and controller design method. Proposed controller design method is efficient in changing modes. Numerical simulation of parameter estimation based on time-domain input/output data is provided to demonstrate the estimation performance of the proposed method.
김예진,김민근,정훈상,최영진,강치중,윤태식,이현호 한국바이오칩학회 2014 BioChip Journal Vol.8 No.4
It was demonstrated that an organic devicestructure using self-assembly monolayers (SAMs) goldnanoparticles (Au NPs) formed by complementary hy-bridization between probe DNA and target DNA. Thedevice was fabricated in a form of metal-pentacene-in-sulator-silicon capacitor. Dielectric SiO2 layer was mod-ified with 3-glycidylpropyl-trimethoxysilane (GPTMS)for SAMs formation of amine terminated probe oligo-DNA. The Au NPs conjugated by thiol terminated tar-get oligo-DNA were charging elements, which werecomplementarily hybridized on the probe DNA SAMs. Capacitance versus voltage (C-V) curves exhibited flat-band voltage shifts, which demonstrated the presenceof charging effect. Charging behavior showed volatileeffect which potentially was targeted to sensor applica-tion and utilization of DNA as material for biomole-cule-based electronic device.
칼만 필터를 이용한 Drive-by-wire 시스템을 가진 자동차에 대한 고장진단
류성필(Seongpil Ryu),정훈상(Hunsang Jeong),곽병학(Byunghak kwak),박영진(Youngjin Park) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_2
Drive-by-wire systems will become popular in the near future, because of their compactness, lightweight and improved controllability. Since there would be no mechanical redundancy in the drive by wire subsystem, the reliability of the system needs to be improved by using fault diagnosis of sensors and actuators.<br/> In the paper, a Kalman filter based fault diagnosis method for the vehicle with the drive by wire system, which includes steer by wire, brake by wire and throttle by wire systems, is proposed It is shown that the proposed method is successful in fault detection and isolation for single sensor/actuator fault of the vehicle system.