The Study of Vehicle Structural Characteristics for Creep Groan Noise

Yoon, Kyu Won; Lee, Jae Cheol; Cho, Sung Sun

doi:10.4271/2011-01-2363

Cited by 10 publications

(3 citation statements)

References 6 publications

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“…18-22 Hz. Depending on the system, first-order frequencies of HF front axle groan can be found in a wider range of higher values, e.g., at 45 Hz [19] or at 97 Hz [20].…”

Section: Creep Groan Phenomenology and Classificationmentioning

confidence: 99%

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.

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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.

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“…18-22 Hz. Depending on the system, first-order frequencies of HF front axle groan can be found in a wider range of higher values, e.g., at 45 Hz [19] or at 97 Hz [20].…”

Section: Creep Groan Phenomenology and Classificationmentioning

confidence: 99%

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.

View full text Add to dashboard Cite

show abstract

“…Depending on the system, 1st order frequencies of HF front axle groan can be found in a wider range of higher values, e.g. at 45 Hz (Vadari and Jackson 1999) or at 97 Hz (Yoon et al 2011).…”

Section: Motivationmentioning

confidence: 99%

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

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.

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“…In Yoon et al, creep groan noise was reproduced using a chassis dynamometer. Through vibration measurements and modal impact tests, the effects of the vehicle system on creep groan noise were analysed [10]. Jung and Chung studied brake creep groan noise using a dynamometer.…”

Section: Detecting Groan Sources In Drum Brakes Of Commercial Vehiclementioning

confidence: 99%

Detecting Groan Sources in Drum Brakes of Commercial Vehicles by TVA-FMEA: A Case Study

Karabay

Baynal

Igdeli

2013

SV-JME

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In this article, the strategy followed by an automobile company for detecting the root causes of groan complaints related to rear drum brakes in commercial vehicles is presented using data collected from the sold troubled vehicles and from new vehicles from the production line, as well as the drum-brake test rig at the laboratory. Drum brake groan is often very intense and can cause large numbers of customer complaints. During a groan noise event, vehicle structure and suspension components are excited by the brake system and result in a violent event that can be heard and felt during brake application. This paper condenses experimental studies on a low frequency drum brake groan problem that has caused high warranty costs. First, the environmental conditions causing the groan were identified and the groan was reproduced. Vehicle tests were performed both at the factory and in traffic. To conclude the planned study, TVA (Total Value Analysis) and FMEA (Failure Mode and Effects Analysis) methods were used effectively. A strategy to determine the root causes was planned and implemented systematically to eliminate the secondary and tertiary effects of brake groan problems. In order to ge to the root causes, vibration and groan measurements were executed and interpreted according to TVA and FMEA charts. The sensitivity of the lining material of the brake shoes to different environmental conditions was investigated. Finally, the groan mechanism of the drum brake system is discussed and the solution to the low frequency drum brake groan problem is evaluated in detail.

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The Study of Vehicle Structural Characteristics for Creep Groan Noise

Cited by 10 publications

References 6 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

Detecting Groan Sources in Drum Brakes of Commercial Vehicles by TVA-FMEA: A Case Study

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