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브레이크 마찰재의 Creep Groan Noise 발생 원인과 그 개선 대책에 관한 연구
손태관(Tae-Kwan Sohn) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Creep groan is caused by the many reasons - mechanical system parameters, tribology (friction law), friction material, and etc. - but it was considered so-called Stick-Slip-Effect mainly between low-steel brake pads and disk. Usually, low-steel friction materials have a tendency to have creep groan more than non-steel friction materials because low-steel friction material contains steel fiber or wool. In order to reduce creep groan, steel fiber which is main factor of influencing creep groan was substituted for a alloyed material and measured its effect with 1/5 scale dynamometer that can measure correlation static and dynamic friction coefficient.
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초저온다습 조건에서 발생되는 자동차 브레이크 마찰재의 스퀼 노이즈 발생 원인과 그 개선 대책에 관한 연구
손태관(Tae-Kwan Sohn) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
There are many factors of the automotive brake squeal noise such as the friction coefficient, hardness, deformation characteristics of friction materials. Recently, the squeal noise occurred at normal and low temperature. especially at below -15℃, is an issue, and it is difficult to define the apparent cause and solution. It was found that the very cold-temperature noise is concerned with the material properties like the storage modulus and the friction coefficient at very low temperature and high humidity. For satisfying a customer with their claim and quality problem, we have to control the dynamic mechanical properties as well as friction coefficient, hardness, deformation characteristics in order to define the cause of the squeal. In this study we researched the relation between the storage modulus and variation of friction coefficient of the friction material and the squeal noise at low temperature by a scale tester and a vehicle test. As the result of test, the storage modulus and friction coefficient of friction material at low temperature, high humidity is a significant factor of the squeal noise.
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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.
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알루미늄 합금 디스크용 난-스틸 마찰재의 조성 및 특성연구
諸葛英淳,張相熙,孫泰寬 慶一大學校 2002 論文集 Vol.18 No.-
This paper deals with the studies on the formulation and properties of asbestos-free friction material for aluminium alloy disk. The physical properties and formulation analysis for a friction materials using various instrumental methods such as XRF, XRD, SEM & EDX system, I.C.P spectrometer, etc. were performed and discussed. The specific gravity and the hardness of the friction material were 1.75∼1.85 and HRs 20∼40, respectively. It was found that the organic Kevlar fiber and phenolic resin(novolac) are contained in the formulation as the reinforcing fiber and the matrix, respectively. Other various organic and inorganic/metallic components such as cashew dust, rubber, BaSO_4, CaCO_3, Al_2O_3, Cu, Al, Fe_2O_3, MoS_2, graphite, etc. were contained in the present friction material. The friction properties of the friction materials were tested with 1/5 scale dynamometer.
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