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직렬 4기통 엔진용 밸런스 샤프트의 베어링 및 불평형 질량 위치 결정 문제
배철용(Bae, Chul-Yong),김찬중(Kim, Chan-Jung),이동원(Lee, Dong-Won),권성진(Kwon, Seong-Jin),이봉현(Lee, Bong-Hyun) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.3
Balance shaft module contributes to reduce the engine-born vibration by compensating it from a unbalance mass with opposite phase but practically, this device has some problems during the operation in a high speed owing to the considerable amount of unbalance mass that leads to the large quantity of bending deformation as well as torque fluctuation at the balance shaft. To tackle two main problems, the design strategy on balance shaft is suggested by addressing the optimal location of unbalance mass and supporting hearing based on the formulation of objective function that minimizes critical issues, both bending deformation as well as torque fluctuation. The boundary condition of balance shaft assumes to be free such that any external force or contact component is not taken into consideration in this study.
배철용(Bae, Chul-Yong),김완수(Kim, Wan-Su),김찬중(Kim, Chan-Jung),이봉현(Lee, Bong-Hyun),장운성(Jang, Woon-Sung),모유철(Mo, Yu-Chul) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.9
Currently, automotive industries improve the vehicle performance and reduce the development period of vehicle using each module part for the high quality and performance of vehicles. However each component part doesn't generate the noise and vibration problems, sometime these problems are generated on the assembly status between vehicle chassis frame and each module part. On this study, in order to analysis the dynamic characteristics of a shield door module that is a typical module part of vehicles, the acquisition and evaluation process about the vibration and noise of shield door module is developed. Also the possibility to apply to shield door module of the developed process is verified by the comparison with the dynamic characteristics between plastic and steel module plate.
자동차 부품에 대한 다축 진동내구 시험용 신호처리 방법
배철용(Bae, Chul-Yong),김찬중(Kim, Chan-Jung),이동원(Lee, Dong-Won),이봉현(Lee, Bong-Hyun),나병철(Na, Byung-Chul) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.3
Multi-axial simulation table(MAST) is widely used in motor companies as the multi-axial excitor for vibration fatigue of target component, which provides the vibrational condition as close as the vehicle test. However, the vibration fatigue performance of target component can be guaranteed with MAST system only in case the input profile covers the required severity of the target component on field test. In this paper, the signal processing for multi-axial vibration fatigue test on vehicle component is presented, from the data acquisition of the target component to the derivation of input profile. To compare the severity of vibration condition between field and proving ground, the energy principle of a equivalent damage is proposed and then, it is determined the optimal combination of special events on proving ground using a sequential searching optimal algorithm. To explain the vibration methodology clearly, seat and door component of vehicle are selected as a example.
배철용(Bae, Chul-Yong),김찬중(Kim, Chan-Jung),권성진(Kwon, Seong-Jin),이봉현(Lee, Bong-Hyun),장운성(Jang, Woon-Sung),이준우(Lee, Joon-Woo) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.11
This study presents the design improvement process for door module. Its objective evades the resonance generated at module plate due to the operation of window regulator motor. For this study, the design improvement process is composed of experimental methods having three steps. First step is modal analysis at door assembly status for acquisition of dynamic characteristics which are modal frequency and damping. Second step is a vibration experiment to get the test mode considered an efficiency of window regulator motor. Last step is a vibration measurement by the form of $6{\times}6$ array on module plate. A vibration measurement of $6{\times}6$ array form can be got to three analysis results which are a transfer path of vibration using cross correlation function, a vibration map using OA level and a contribution by frequency band using coherent output power spectrum on module plate. These results are applied to SDM(structural dynamic modification) for design improvement to get around the resonance on module plate by the excitation of window regulator motor.