Advancements on bifurcation behavior and operational deflection shapes of disk brake creep groan

Huemer-Kals, Severin; Kappauf, Jonas; Zacharczuk, Martin; Hetzler, Hartmut; Häsler, Karl; Fischer, Peter

doi:10.1016/j.jsv.2022.116978

Cited by 7 publications

(11 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Further insights towards the bifurcation behavior and classification of different creep groan classes were recently given by Prezelj et al [13], Smith et al [15], and Huemer-Kals et al [10]. It was found that several different creep groan classes with different basic frequency or different frequency contents occur, depending on the test setup.…”

Section: Motivationmentioning

confidence: 89%

“…Creep groan vibrations are dominated by two different basic movements: a forward-backward movement of the whole axle and a rotational movement of the caliper and wheel carrier around the wheel's axis [10,14]. Mainly depending on the operating parameters brake pressure p B and vehicle speed v veh , different combinations and interactions of these movements can occur.…”

Section: Creep Groan Phenomenology and Classificationmentioning

confidence: 99%

“…Huemer-Kals et al [10] analyzed different creep groan classes and their operational deflection shapes (ODS) on a half-axle test bench. Compared to vehicle tests, HF groan was found very similar on the half-axle test bench.…”

Section: Creep Groan Phenomenology and Classificationmentioning

confidence: 99%

“…Hence, an additional number is added to the class name (e.g., LFA1 vs. LFA2 groan), describing this number of peaks per basic cycle. Table 1 summarizes the resulting half-axle classes within half-axle tests of Huemer-Kals et al [10] and mentions the according, comparable vehicle creep groan class.…”

Section: Creep Groan Phenomenology and Classificationmentioning

confidence: 99%

See 3 more Smart Citations

Psychoacoustic characteristics of different brake creep groan classes and their subjective noise annoyance in vehicle and half-axle tests

Huemer-Kals

Tóth

Prezelj

et al. 2023

Automot. Engine Technol.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Motivationmentioning

confidence: 89%

Section: Creep Groan Phenomenology and Classificationmentioning

confidence: 99%

Section: Creep Groan Phenomenology and Classificationmentioning

confidence: 99%

Section: Creep Groan Phenomenology and Classificationmentioning

confidence: 99%

See 2 more Smart Citations

Psychoacoustic characteristics of different brake creep groan classes and their subjective noise annoyance in vehicle and half-axle tests

Huemer-Kals

Tóth

Prezelj

et al. 2023

Automot. Engine Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Fluctuation strength in Fig. 12d shows a different trend: Coming from highest levels at perfect subjective rating (10), FS decreases down to ratings of 6, then increases again towards lower ratings. This could relate to the occurrence of LF and TG classes, as shown in Fig.…”

Section: Question 2: Psychoacoustic Quantities Vs Subjective Ratingmentioning

confidence: 94%

Psychoacoustic Characteristics of Different Brake Creep Groan Classes and their Subjective Noise Annoyance in Vehicle and Half-Axle Tests

Huemer-Kals

Tóth

Prezelj

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Bremsenknarzen im NVH-Entwicklungsprozess: Detektion, Klassifizierung und objektive Bewertung

et al. 2022

View full text Add to dashboard Cite

Advancements on bifurcation behavior and operational deflection shapes of disk brake creep groan

Cited by 7 publications

References 11 publications

Psychoacoustic characteristics of different brake creep groan classes and their subjective noise annoyance in vehicle and half-axle tests

Psychoacoustic characteristics of different brake creep groan classes and their subjective noise annoyance in vehicle and half-axle tests

Psychoacoustic Characteristics of Different Brake Creep Groan Classes and their Subjective Noise Annoyance in Vehicle and Half-Axle Tests

Bremsenknarzen im NVH-Entwicklungsprozess: Detektion, Klassifizierung und objektive Bewertung

Contact Info

Product

Resources

About