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브레이크 패드 마찰재의 탄성 물성 측정을 이용한 NVH 해석
권성진(Seong-Jin Kwon),이동원(Dong-Won Lee),배철용(Chul-Yong Bae),이봉현(Bong-Hyun Lee),서병연(Byoung-Youn Seo) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The elastic properties of friction materials in brake pads are important design parameters because modulus variations may be significant in noise generation of automotive braking systems. In this paper, the elastic properties of friction materials have been investigated through the precise ultrasonic velocity measurements. By exploiting the fundamental relationship among sound speed in specific propagation directions and the elastic constants, the engineering constants, i.e. Young’s modulus, shear modulus, and Poisson’s ratio, have been determined. With the measured elastic constants and engineering constants, the vibration characteristic analysis based on finite elements method has been carried out to analyze the modal characteristics and the squeal noise characteristics of the target disc brake systes.
권성진(Seong-Jin Kwon),김문성(Mun-Sung Kim),김찬중(Chan-Jung Kim),나병철(Byung-Chul Na),김현철(Hyun-Chul Kim),이봉현(Bong-Hyun Lee),손태관(Tae-Kwan Sohn) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Although there has been substantial research on the squeal noise for the automotive brake system, robust design issues with respect to control factors equivalent to design variables in optimization, noise factors due to system uncertainties, and signal factors designed to accommodate a user-adjustable setting still need to be addressed. For the purpose, the robust optimal design applied to the disk brake system has been investigated by DOE (Design of Experiments) based Taguchi analysis with dynamic characteristics. The specific goal of this methodology is to identify a design with linear signal-response relationship, and variability minimization. The finite element models of the disk brake assembly have been constructed, and the squeal noise problems have been solved by complex eigenvalue analysis. As the practical robust optimal design, material properties of pad, disk, and backplate, thickness and geometry of pad are selected as control factors, material properties of pad and disk, and the contact stiffness have been considered as noise factors, and friction coefficient between pad and disk is chosen as a signal factor. Through the DOE based robust design, the signal-to-noise ratio and the sensitivity for each orthogonal array experiment have been analyzed. Also, it has been proved that the proposed robust optimal design is effective and adequate to reduce the brake squeal noise.