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By now, the brake noises have been classified by using a variety of different words like judder, groan, moan, squeal, squeak, hum, etc. For simplicity, based on their frequency ranges, they can be grouped into 3 categories: judder (around 10 Hz), groan (50–150 Hz) and squeal (>1k Hz). Brake creep groan noise is generated when a brake pedal is slowly released especially in an automatic transmission car which was initially stationary. The primary reason is a stick-slip behaviour between the pads and the disc. Stick occurs when the pad and the disc move together with no relative movement between them, while Slip occurs when the brake force decreases and the wheel torque begins to catch up with the brake torque and eventually a wind up of the brake assembly causes a momentarily slip. Without further release of the brake pressure, the stick happens again and the cycle repeats. The noise and vibration due to this sustained stick-slip is called brake groan.
A Multibody quarter car model was developed using a Multibody Simulations (MBS) software with data from Volvo Cars to simulate the Brake Groan phenomenon. The model contained a detailed brakes system and the quarter car front suspension system with all the suspension components modelled flexible (deformable). The Brakes components on the other hand, e.g. Brake pads, disc, callipers, piston etc. were modelled as rigid bodies. The aim of this work was to capture the stick-slip between the disc and the pads as the brakes are slowly released and the vehicle is accelerated gradually.
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go back to reference Brennan, M.J., Shin, K.: Brake noise prediction and control. In: Crocker, M.J. (ed.) Handbook of Noise and Vibration Control. Wiley, Hoboken (2008). https://doi.org/10.1002/9780470209707. Online ISBN 9780470209707 CrossRef Brennan, M.J., Shin, K.: Brake noise prediction and control. In: Crocker, M.J. (ed.) Handbook of Noise and Vibration Control. Wiley, Hoboken (2008). https://doi.org/10.1002/9780470209707. Online ISBN 9780470209707 CrossRef
go back to reference Documentation from Simpack 2019x Documentation from Simpack 2019x
go back to reference Jung, T., Chung, S.: Research for brake creep groan noise with dynamometer. SAE Int. J. Passeng. Cars – Mech. Syst. 5(4) (2012). https://doi.org/10.4271/2012-01-1824 Jung, T., Chung, S.: Research for brake creep groan noise with dynamometer. SAE Int. J. Passeng. Cars – Mech. Syst. 5(4) (2012). https://doi.org/10.4271/2012-01-1824
- Capturing Brake Groan Using Multibody Quarter Car Model
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- Springer International Publishing