Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Computational Study of Automotive Drum Brake Squeal

자동차 드럼 브레이크의 스퀼 전산 해석 연구

  • Jung, Taeksu (Department of Mechanical Engineering, Graduate School, Inha University) ;
  • Cho, Chongdu (Department of Mechanical Engineering, Inha University)
  • 정택수 (인하대학교 대학원 기계공학과) ;
  • 조종두 (인하대학교 기계공학과)
  • Received : 2013.12.10
  • Accepted : 2014.06.30
  • Published : 2014.11.01
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Abstract

Automotive NVH on brake operation is mainly caused by a coupling action of vehicle speed and inter parts friction and its frequency occurs over a broad band of 0.1 kHz~10 kHz. Especially, squeal noise, being a self-excited vibration generated by friction force between drum and lining, occurs over 1 kHz and consequently dynamic instability is induced when friction energy is applied to a brake vibration system. The squeal strongly depends on nonlinear properties influenced by the material of lining, velocity of vehicle, and the dynamic properties of a brake system. The dynamic properties are considered as a main influential design factor to squeal noise, however the analysis of the properties are rarely facilitated due to arbitrariness of shape by wearing down. In this paper, we research generating tendency of squeal noise through complex eigenvalue analysis, tracking drum brake's unstable modes in accordance with the wear shape of drum and lining such as tapered and bellmouth shape, and analyze computed unstable modes by variable shapes.

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References

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