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열변형 및 주파수 모드분리를 고려한 디스크 브레이크 로터 설계
조준수(Joonsoo Cho),김민석(Minsock Kim),류남열(Namyeul Ryu),최상열(Sangyeol Choi),최진호(Jinho Choi),김용석(Yongsuk Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
In order to optimally design a rotor of disc brake system, various design requirements should be considered such as braking performance, durability, thermal performance, noise characteristics, etc. Especially, thermal performance is fundamental in rotor design not only for safety but also for hot judder, and insensitive design to the brake squeal noise is vital for the customer quality in modern vehicles since it is one of the top quality issues in the field. In this paper, complex eigenvalue analysis has been performed for identifying frequencies sensitive to the brake squeal noise, and coning analysis is performed for thermal deformation. Based on those CAE analyses and DOE study, this paper presents the critical design variables for the robust squeal noise performance, and also deals with the rotor design considering the thermal deformation.
Twist Axle 서스펜션을 고려한 저주파 브레이크 노이즈 해석
조준수(Joonsoo Cho),배현우(Hyunwoo Bai),김민석(Minsock Kim) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Brake moan noise has been mostly problematic with rear chassis subsystems. The moan phenomenon exhibits itself as a low frequency chassis vibration accompanied with uncomfortable noise level both inside and outside the vehicle compartment. Brake moan noise analysis has been established by self-excited friction model based on instability vibration theory. The instability chart is obtained as a result of comprehensive investigation employing twist axle type rear chassis subsystem. The objective of this paper is to investigate mechanism of generating brake moan noise in twist axle type rear chassis subsystem. The dominant suspension parameter considering reducing brake moan noise is presented with respect of verification involving durability cycles and roll steer on twist axle type rear chassis subsystem.
브레이크 소음 해석의 신뢰도 향상을 위한 패드 물성치 보정에 관한 연구
김민석(Minsock Kim),조준수(Joonsoo Cho),최진호(Jinho Choi),김용석(Yongsuk Kim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Brake squeal noise is one of the crucial design factors in the vehicle development as one of the biggest customer complaints. In order to design and develop a robust brake system for the squeal noise, automotive engineers have tried to make the best use of CAE technology for the squeal noise prediction in the proper stages of vehicle development. But it is not easy to predict the noise performances due to the difficulty of building-up the high-fidelity model as well as getting the proper material data for the analysis. Especially, the anisotropic pad material data are essential for the squeal noise simulation, but it is very hard to get the reliable data due to the inaccuracy of the measurement. Recently the ultrasonic measurement method has been commonly used to measure and calculate anisotropic pad elastic constants. Even using the data by the ultrasonic method, many eigenvalue analyses show different results from FRF (Frequency Response Function) tests. This paper presents a study on anisotropic pad elastic constants correlation for improving the fidelity of brake squeal noise analysis based on optimization technique using FRF test results as well as ultrasonic measurement results. This study is applied to complex eigenvalue analysis of a brake system while most of the previous studies deal with eigenvalue analysis of a pad component, and it shows that the analysis results are well correlated with the test results.