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남재현(Jaehyoun Nam),강재영(Jaeyoung Kang) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Squeak noise of BSR problem is studied by using the pin-on-disk system with aluminum pin and steel disk. Noise induced by friction is measured with respect to the static loads and sliding speeds. The negative slope of frictionvelocity curve is seen when the squeak noise occurs. It is found that the static load is one of the factors influencing the sound level of squeak noise. By conducting the hammering test, the frequency of the squeak noise is shown to correspond to one of system modes, which implies that squeak phenomenon arises from the unstable system modes.
남재현(Jaehyoun Nam),강재영(Jaeyoung Kang) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Brake squeal is the noise produced by the friction between disc and pad. Mode coupling mechanism is sometimes insufficient in studying brake squeal. In this paper, the negative slope mechanism is incorporated into the finite element modeling of disc brake squeal. The instability of specific in-plane mode was found to arise from the negative slope of the friction coefficient. The squeal propensity of this mode was shown to be sensitive to the brake pressure.