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김충경,김노유 한국비파괴검사학회 2019 한국비파괴검사학회지 Vol.39 No.3
This paper describes a method for the detection of unbalanced mass in turbo-charger impellers of automobiles. This method uses vibration signals, through which the size and location of the unbalanced mass can be evaluated successfully and used to reduce any excess vibration. The continuous unbalanced distribution of the turbo-charger was assumed to be concentrated at two planes along the rotational axis in order to derive a transfer matrix for the relationship between the imbalance and its corresponding vibrations. Coefficients of the transfer matrix were determined experimentally in modal coordinates to calculate the imbalance of the turbo-charger. This was achieved by measuring the vibrations of two trial masses that were independently applied to the turbo-charger. Experimental equipment to operate turbo-charger samples and measure the imbalance vibration was designed and developed for implementation and verification of the proposed method. Unbalanced turbo-charger impellers from manufacturers were tested with this equipment to determine the magnitude and location of residual imbalance of each sample. It was found that the imbalance of turbo-charger samples was detected accurately and that the vibration of the turbo-chargers could be reduced significantly by removing the residual imbalance. 자동차 엔진용 터보챠저(turbo-charger) 임펠러의 회전 불균형(unbalance)을 측정하기 위한 모드 해석기반의 이론 모델식과 검사방법을 개발하고 생산중인 시험제품에 적용하여 불균형 질량을 성공적으로 측정하고 진동을 대폭 저감하였다. 터보챠저 임펠러의 연속적인 잔류 불균형 질량과 진동응답을 회전축상의 2개의 평면에 집중된 이산 시스템으로 모델링하고 이들간의 선형적인 동역학적 관계식을 전달행렬식으로 유도하였다. 이 전달계수 행렬을 인위적인 시험질량(trial mass)을 사용하여 모드 좌표계에서 결정하였으며, 이 값을 이용해 터보챠저 임펠러의 잔류 불균형 질량의 크기와 위치를 평가하였다. 실험적인 검증을 위해 터보 챠저 임펠러를 고속으로 회전시킬 수 있는 구동장치와 진동 계측장치를 개발하였으며 양산중인 시험용 터보차저 시험편을 대상으로 불균형 질량을 성공적으로 검사함으로서 진동을 크게 감소시킬 수 있었다.
모터 구동식 조향 장치의 전자 제어 시스템 개발에 관한 연구
이재인(Jaein Lee),선우명호(Myoungho Sunwoo),이우택(Wootaik Lee),이용국(Yongkuk Lee),우덕현(Dukhyun Woo),김충경(Chungkyong Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
Global competition of automotive market and affordable prices of electronic components become the major reason that automotive industries rpidly employ a large number of electric and electronic syseems to improve vehicle performance and to meet various regulations such as emission, fuel efficiency, and safety. Especially, the provision of a motor-driven steering column (MDSC) for luxury vehicle is getting popular for drivers' covenience. In this study, an MDSC is developed, which provides several intelligent features such as the manual operation for tilting and telescoping the steering wheel, and the save/recall operation for three different steering wheel positions. In addition, the over-current detecting circuit will protect the DC motors, and the diode circuitry for the power input will also protect the electric circuit of the ECU for reverese connection to power and ground.<br/>