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디스크 브레이크 로터의 형상 최적화를 통한 스퀼소음 저감
심현진(Hyunjin Sim),이현영(Hyunyong Lee),조용구(Yonggoo Joe),이정윤(Jungyoun Lee),오재응(Jaeeung Oh) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
This paper deals with friction-induced vibration of disc brake system under constact friction coefficient. A linear. finite element model to represent the floating caliper disc brake system is proposed. The complex eigenvalues are used to investigate the dynamic stability and in order to verify simulations which are based on the FEM model. The comparison of experimental and analytical results shows a good agreement and the analysis indicates that mode coupling due to friction force and geometric instability is responsible for disc brake squeal. And the Front brake system reduced the squeal noise using design of experiment method (DOE). This helped to validate the FEM model and establish confidence in the simulation results. Also they may be useful during real disk brake model.
윤태건(Taekun Yun),심현진(Hyunjin Sim),이해진(Haejin Lee),이정윤(Jungyoun Lee),오재응(Jaeeung Oh) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
Since human listening is very sensitive to sound, a subjective index of a sound quality is required. Therefore, in the analysis for each situation, the sound evaluation is composed with sound quality factor. Many researchers spends their effort to make a more reliable and more accurate of sound in term of sound quality index for various system noise. In this study a reliable index is constructed and analyzed using correlation analysis, regression analysis and weighting factor for each sound quality factor. We have made the sound quality index that agrees with more than human subjective sensitivity which apply to various sound quality metrics. Also we applied a 'grade' metric to jury for sound evaluation, analyzed relation between sound quality index and sound quality grade. Then we will judge the sound quality level according to the sound quality grade scheme.