Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Numerical and Experimental Analysis for Disc Brake Squeal Induced by Caliper Mode

캘리퍼 모드에 의한 디스크 브레이크 스퀼 시험 및 해석

  • Choi, Hoil (Div. of Mechanical and Automobile Engineering, Kongju Nat'l Univ.) ;
  • Kang, Jaeyoung (Div. of Mechanical and Automobile Engineering, Kongju Nat'l Univ.) ;
  • Gil, Hojong (Div. of Mechanical and Automobile Engineering, Kongju Nat'l Univ.)
  • 최호일 (공주대학교 기계자동차공학부) ;
  • 강재영 (공주대학교 기계자동차공학부) ;
  • 길호종 (공주대학교 기계자동차공학부)
  • Received : 2014.05.28
  • Accepted : 2014.08.25
  • Published : 2014.12.01
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Abstract

This study numerically simulates brake squeal and validates it experimentally by using a lab-scaled brake dynamometer. The system frequencies of the disc brake are traced with respect to the brake pressure by using a modal test and FEM. Then, the squeal frequencies measured from the brake dynamometer are found to correspond to the brake system mode with the dominant displacement of the caliper and pad. Furthermore, a complex eigenvalue analysis conducted using the finite element model confirms that the caliper mode generating the rotational displacement of the pad becomes unstable owing to the negative friction-velocity slope.

본 논문은 차량 제동 시 발생하는 소음의 원인을 해석적으로 예측하고, 본 실험실에서 제작한 브레이크 다이나모 메터를 이용하여 실험적으로 검증하였다. 압력 변화에 따른 브레이크 시스템에 대한 주파수 응답 시험 및 유한 요소 해석(FEM)을 실시하여 캘리퍼 및 디스크의 수직 모드(Out-of-plane)의 시스템 주파수를 추적하였다. 이를 제동 시 발생한 스퀼 소음의 주파수와 비교해본 결과 스퀼 주파수는 캘리퍼 및 패드의 변위를 갖는 시스템 모드임을 확인하였다. 또한 유한 요소 해석을 이용한 복소수 고유치 해석 결과 패드의 회전변위를 발생시키는 캘리퍼 모드가 음의 마찰곡선 기울기와 연동하여 불안정하게 됨을 확인하였다.

Keywords

Acknowledgement

Supported by : 한국연구재단

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