The Study of Vehicle Structural Characteristics for Creep Groan Noise

Creep-groan noise is a low frequency noise less than 1000Hz and occurs when the vehicle is moving from stop or slowly stopping while the brake is applied at low brake pressure. The vibration source causing the sound is commonly thought to result from friction force variation in stick-slip phenomenon between friction material and disc. In the past, studies have been mainly focused on stick-slip. However, systematic approach involving chassis components has been recently investigated. In this paper, using a chassis dynamometer creep groan noise was reproduced. Through vibration measurements and modal impact tests, the effects of the vehicle system on creep noise were analyzed.