Projects per year
Brake creep groan is a severely annoying noise and vibration phenomenon. Especially on the Asian market, customer feedback about creep groan is common, indicating creep groan’s impact towards the quality impression of a car. Hence, treatment of these stick–slip-related creep groan phenomena is necessary. As numerous design conflicts exist for brake and axle, a complete mitigation of the phenomenon is often not possible. A reduction of creep groan’s annoyance by changing the noise’s level and characteristics is therefore typically aspired. One approach towards this goal could include the usage of psychoacoustics: This work deals with psychoacoustic characteristics of different creep groan classes. Low-frequency groan, high-frequency groan, and transition groan classes are compared regarding loudness, sharpness, roughness, fluctuation strength, and tonality. Standard statistic methods as well as machine learning approaches are applied on signals from vehicle tests and half-axle tests. Test results depict the different characteristics of each creep groan class. By mapping the results to the subjective rating of trained test drivers, the annoyance of different classes is compared. Low-frequency groan, dominated by longitudinal axle vibrations, is found to be least annoying. This low annoyance is best depicted by the psychoacoustic parameters loudness and roughness. Presented results allow an optimization of brake system design to reduce creep groan’s annoyance, leading to higher customer satisfaction and a more goal-oriented treatment of this NVH problem.
|Journal||Automotive and Engine Technology|
|Publication status||Published - 14 Feb 2023|
- Creep groan
- Disk brakes
- Signal processing
- Subjective annoyance
Fields of Expertise
- Mobility & Production
FingerprintDive into the research topics of 'Psychoacoustic characteristics of different brake creep groan classes and their subjective noise annoyance in vehicle and half-axle tests'. Together they form a unique fingerprint.
- 1 Finished
- 1 Talk at conference or symposium
Psychoacoustic Characteristics of Different Creep Groan Phenomena and their Influence on Subjective Noise Annoyance in Vehicle Tests
Severin Huemer-Kals (Speaker), Máté Tóth (Contributor), Jurij Prezelj (Contributor), Martin Zacharczuk (Contributor), Peter Fischer (Contributor) & Karl Häsler (Contributor)15 Jul 2022
Activity: Talk or presentation › Talk at conference or symposium › Science to science