http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
임병덕(B.D.Lim),정규강(K.K.Chung),전오성(O.S.Jun),권영대(Y.D.Kwon) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
The brake noise can be generated by brake drum vidration when the brake force is exerted on the drum. Even under the condition of constant friction coefficient the brake drum and shoe are nutually affected by each other through the brake material such that the squeal noise is generated by self excitation. In this study, the equation of motion is derived by energy method for the combined system, which consists of drum, shoe and equvalent spring for the brake material. The natural frequencies and mode shapes of the system are obtained by numerical calculation and experiment. The mode shapes are also obtained experimentally through modal analysis by using transfer function method for a drum brake assembly with the braking force applied. The analytical and experimental results are compared with each other. The numerical and experimental results show that the error for the natural frequencies up to third mode is less than 5 percent. The mode shapes up to the fourth mode are in good agreement with numerical results. Measurement of the brake noise from brake dynamometer shows that there is a close relation between unstable squeal noise and the natural frequencies up to fourth mode.<br/>