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박철휴(Chulhue Park),홍성일(Seongil Hong),박현철(Hyunchul Park) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The performance of a mixed H<SUB>∞</SUB> / H₂ design with pole placement constraints based on robust vibration control for a piezo/beam system is investigated. The governing equation of motion for the piezo/beam system is derived by Hamilton’s principle. The assumed mode method is used to discretize the governing equation into a set of ordinary differential equation. A robust controller is designed by H<SUB>∞</SUB> / H₂ feedback control law that satisfies additional constraints on the closed-loop pole location in the face of model uncertainties, which are derived for a general class of convex regions of the complex plane. These constraints are expressed in terms of linear matrix inequalities (LMIs) approach for the multiobjective synthesis. The validity and applicability of this approach for vibration suppressions of SMART structural systems are discussed by damping out the multiple vibrational modes of the piezo/beam system.
박철휴(Chulhue Park),이정주(Jungju Lee),박현철(Hyunchul Park) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this paper, we investigate the influence of edge elements for the passive damping system. Especially, the performance of the passive constrained layer damping is affected by two edge elements located onto the boundaries of the constraining layer, a piezo cover sheet. The purpose of these edge elements is to increase the transmissibility of the active action. However, we found these edge elements make a reduction the performance of the passive constrained layer damping (PCLD). To verify this fact, the axialbending- shear coupled equations of motion of the passive damping with edge elements are derived through the Hamilton's principle. The equations of motion are discretized by applying the finite element method. Numerical solutions of the analytical models are presented for the cantilevered beam in order to study the performance of the passive constrained layer damping with edge elements. The obtained mathematical model is validated experimentally. The developed analytical and experimental work provide an invaluable tool for designing and predicting the performance of the passive damping method.
BLDC기반 ETC 모듈의 고정도 위치제어에 관한 연구
이상훈(SangHun Lee),박철휴(ChulHue Park) 한국자동차공학회 2008 한국자동차공학회 지부 학술대회 논문집 Vol.2008 No.11
This paper describes the high response and high precision position control of ETC control system using a BLDC motor without the hall sensor for detecting a rotor position. The proposed ETC control system, which is mainly consisted of a BLDC motor, a throttle plate, a return spring and reduction gear, has a position sensor with an analog voltage output on the throttle valve instead of BLDC motor for detecting rotor position. So the additional commutation information is necessarily needed to control the ETC module. For this, the estimation method is applied. In order to improve and obtain the resolution for the position control, it is generally needed to change the gear ratio of the ETC module or the electrical switching method etc. In this paper, the 3-phase switching between successive commutations is used instead of the 2-phase switching. Through the mentioned method, the estimation of commutation state and the high precision position control for operating the system is possible and the high response characteristics is too. The validity of the method is examined through the experimental results.
최현진(Hyunjin Choi),박철우(Chulwoo Park),박철휴(Chulhue Park),이종철(Jongcheol Lee),김종갑(Jonggab Kim),최성대(Seongdae Choi) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The most important properties of the automotive engine seal are the low friction and the abrasion resistance. In order to strengthen these properties, the two types of seal are developed and analyzed. One seal is made by mixing the PTFE and the glass fiber and the other is made by mixing the PTFE, the glass fiber and the molybdenum. The analysis of the stress and the reaction force are carried out using the shape design of seal, which is mounted on the front part of the automotive engine. We analyzed the maximum stress and the contact weight of PTFE lip part and then made the two types of PTFE seal. Finally, we evaluated the stress concentration and the abrasion resistance through the coefficient of friction and torque and endurance test.