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휠 제동 장치의 스퀼 소음 해석을 위한 해석 모델 구축
차정권(Cha Jung-kwon),박영일(Park Yeong-il),이동균(Lee Dong-Kyun),조동현(Cho Dong-Hun),김기남(Kim Ki-Nam),백진성(Beak Jin-Sung) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Squeal of disk brake is a noise and self excited vibration with frequency range of 1~10Khz cause by the friction force between the disk and the pad of the automobile. Passengers in a cehicle feel uncomfortable. In this paper modal analysis of wheel brake system was performed in order to prediction of squeal phenomenon. It was shown that the prediction of system instability is possible by FEM. finite element model of that brake system was made. Some parts of a real brake was selected and modeled. The normal mode analysis method performs analyses of each brake system component. Experiment of modal analysis was performed for each brake components and experimental results were compared with analytical result from FEM.
차정권(Jungkwon Cha),김기남(Ki-nam Kim),조동현(Yeong-il Park),박영일(yeong-il Park) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Squeal, a kind of self-excited vibration, is generated by the friction between the disc and the friction materials. It occurs at the ending stage of the braking process, and radiates and audible frequency range of 1 ㎑ to 10 ㎑. Squeal is generated from unstability because of the coupling between the translation and rotation of the system. This instability is caused by the follower force and follower force is normal component of the friction force. In this paper modal analysis of wheel brake system was performed in order to prediction of squeal phenomenon. It was shown that the prediction of system instability is possible by FEM.A finite element model of that brake system was made. SOme parts of a real brake was selected and modeled. The normal mode analysis method performs analyses of each brake system component. Experiment of modal analysis was performed for each brake com
차정권(Cha, Jung-Kwon),박영일(Park, Yeong-Il) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.1
Squeal, a kind of self-excited vibration, is generated by the friction between the disc and the friction materials. It occurs at the ending stage of the braking process, and radiates and audible frequency range of 1 kHz to 10 kHz. Squeal is generated from unstability because of the coupling between the translation and rotation of the system. This instability is caused by the follower force and follower force is normal component of the friction force. In this paper modal analysis of wheel brake system was performed in order to predict the squeal phenomenon. It was shown that the prediction of system instability is possible by FEM. A finite element model of that brake system was made. Some parts of a real brake was selected and modeled. Modal analysis method performs analyses of each brake system component. Experimental modal analysis was performed for each brake components and experimental results were compared with analytical results from FEM. To predict the dynamic unstability of a whole system, the complex eigenvalue analysis for assembly modeling of components confirmed by modal analysis is performed. The finite element models of the disk brake assembly have been constructed, and the squeal noise problems have been solved by complex eigenvalue analysis. The complex eigenvalue analysis results compared with real train test.
차정권(Jungkwon Cha),정상진(Sangjin Jung),최장원(Jangwon Choi),이희용(Heeyong Lee) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
This paper shows a whole noise developing procedure and items for the new developed Mid-CVT. Through the case FRF test, the robust design of the CVT was investigated. To reduce the planetary gear noise, the gear tooth-contact pattern test was performed. Through the gear tooth-contact pattern test, the new specification was developed. And all gear grinding methods are also used. Due to demands for reducing the serious abnormal chain-belt noise some special test method are developed and applied. Though the control of guiderail length and chain pitch length, chain-belt noise could be handled and reduced effectively. The whole developing process and results will offer good guides to the engineers who develop the new CVT.
차정권(Jungkwon Cha),정상진(Sangjin Jung),조명수(Myungsoo Cho),최인혁(Inhyuk Choi) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
Reduction of planetary gear noise for the automatic transmission was investigated using dynamic stiffness strengthening of the transmission case and the mounting bracket. Dynamic stiffness of case was improved by the reinforcing rib and shape change, through the FRF test, and 1’st mode frequency was also improved by the shape change of vehicle mounting bracket. After that, noise reduction was confirmed by the comparing before and after vibration and noise level of automatic transmission at the anechoic chamber and vehicle. Test results show that gear noise of transmission was improved 10dB at anechoic chamber and 8dB reduced in vehicle noise respectively.
차정권(Cha Jung-kwon),박영일(Park Yeong-il),이동균(Lee Dong-Kyun),조동현(Cho Dong-Hun) 한국철도학회 2009 한국철도학회 세미나자료 Vol.2009 No.5
Passengers in a vehicle feel uncomfortable due to squeal noise. Squeal noise, a kind of self-excited vibration, is generated by the friction force between the disc and the pad of the automobile. In this paper, modal analysis of wheel brake system was performed in order to prediction of squeal phenomenon. It was shown that the prediction of system instability is possible by FEM. Finite element model of that brake system was made. Some parts of a real brake was selected and modeled. The normal mode analysis method performs analyses of each brake system component. Experiment of modal analysis was performed for each brake components and experimental results were compared with analytical result from FEM. The complex eigenvalue analysis results compared with braking test. The analysis results show good correlation with braking test for the squeal frequency at an unstable mode.
차정권(Kwon-Jung Cha),윤일로(Il-Ro Yoon),김동활(Dong-Howal Kim),후쿠모토(Yozo Fukumoto) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5
Light Rail Vehicle(LRT) is “New Transit System” that has transportation capacity as well as physical size of vehicle is in-between bus and subway. The demand of LRT system is increasing rapidly; both domestically and internationally. Reason being is that it is more economical and eco-friendly compare to existing heavy rail vehicle. Especially, Busan Subway Line 4 K-AGT (Rubber-tired LRT) being the first of its kind to start revenue service in Korea, it is very much likely that application of its demand will continue to increase. Considering its trend, study to reduce implementation cost of LRT is being pursued in many different aspects; reducing construction cost is one that aspect. In this study, on-site application of ‘Up-Down Turnout System’ implementation research has been carried out which can replace existing ‘Left-Right Turnout System’. When safety of its type gets verified, application of this system to line which intends to use K-AGT, Shin-Lim Line and Dong-Book Line, expects to save its construction cost. This thesis paper reports ongoing research of AGT ‘Up-Down Turnout System’ development and main component design factors, fundamental principle, performance test result.