Brake Creep Groan Noise - Vibration Mechanism and Simulation

Research output: Chapter in Book/Report/Conference proceedingConference paper


Creep Groan is an impulsive brake noise at creep velocities of the vehicle. Stick-slip between brake disc and brake pads is an important trigger of creep groan. Flexibili-ties in the axle bushings, elastic deformations of suspension parts and the wheel movements facilitate the nonlinear, periodic signature of creep groan vibrations.
Frequently, creep groan occurs around 15 - 20 Hz and 70 - 90 Hz. The mechanism at 15 - 20 Hz is classical stick-slip. At 70 - 90 Hz, the vibrations are typically in a tran-sition between stick-slip and rotational vibrations without sticking, i.e. at relative speeds between disc and pads in the same direction. In practical vehicle operation, the range of 70 - 90 Hz is the most relevant one.
The simulation by complex modal analysis (CEA), which is a well-established tool for squeal analysis, requires extensive linearisations. These appear not suitable for creep groan phenomena involving distinctive stick phases. For dynamic response analysis in time domain, both implicit and explicit computation methods can be used. However, for larger Finite Element models above some thousand elements, the explicit solution scheme shows clear advantages in terms of computation times and in view of a straightforward procedure for industrial application.
Original languageEnglish
Title of host publicationProceedings of Aachen Colloquium Automobile and Engine Technology 2019
Number of pages21
Publication statusPublished - 7 Oct 2019
Event28. Aachener Kolloquium Fahrzeug- und Motorentechnik - Aachen, Germany
Duration: 7 Oct 20199 Oct 2019


Conference28. Aachener Kolloquium Fahrzeug- und Motorentechnik

Fields of Expertise

  • Mobility & Production


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