Experimental Investigation of Low-Frequency Vibration Patterns in Automotive Disk Brake Systems: Utilization Study for Modal Simulation Methods

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

Abstract

Increasing demands on automotive comfort as well as diminishing vehicle noise levels draw new attention towards low-frequency vibration and noise issues of disk brake systems such as creep groan and moan. In view of this problem, the experimental investigation of relevant phenomena is within the scope of this article. The related experiments concerning two different setups have been performed at a drum driven suspension and brake test rig. Both assemblies consisted of a front axle corner including all parts of the integrated brake system. In order to gain understanding of characteristic triggering mechanisms and fundamental subsystem interactions, and moreover, to verify the suitability of modal methods for simulative evaluations of creep groan or moan, specifically elaborated Operating Deflection Shape (ODS) techniques have been applied. Via analyses of four different creep groan emergences, global stick-slip cycles between disk and pads are revealed. For two dissimilar vibrations in the typical frequency range of moan, mechanisms rather associated with dynamic instabilities are identified. Based on measurement results and further theoretical considerations, the suitability of a disk brake Complex Eigenvalue Analysis (CEA), which is a linear modal simulation method designated to efficiently evaluate disk brake squeal noise, is verified with respect to the relevant friction-induced low-frequency phenomena. Even though the disk brake CEA is inappropriate to estimate a highly non-linear behavior such as involved in all four creep groan signatures, its application for accompanying damped natural oscillations as well as for both observed moan appearances is plausible. By investigation of characteristic pad vibration patterns and speeds belonging to the disk rotation, generic parameter spaces for the utilization of modal methods on harmonic low-frequency phenomena are deduced.
Original languageEnglish
Title of host publicationSAE Technical Paper
Number of pages15
DOIs
Publication statusPublished - 13 Jun 2018
EventISNVH 2018 - 10th International Styrian Noise, Vibration & Harshness Congress - Graz, Austria
Duration: 20 Jun 201822 Jun 2018

Conference

ConferenceISNVH 2018 - 10th International Styrian Noise, Vibration & Harshness Congress
CountryAustria
CityGraz
Period20/06/1822/06/18

Fingerprint

Brakes
Creep
Front axles
Stick-slip
Acoustic noise
Friction
Experiments

Fields of Expertise

  • Mobility & Production

Cite this

Experimental Investigation of Low-Frequency Vibration Patterns in Automotive Disk Brake Systems: Utilization Study for Modal Simulation Methods. / Pürscher, Manuel; Huemer-Kals, Severin; Fischer, Peter.

SAE Technical Paper. 2018. 2018-01-1513.

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

Pürscher, M, Huemer-Kals, S & Fischer, P 2018, Experimental Investigation of Low-Frequency Vibration Patterns in Automotive Disk Brake Systems: Utilization Study for Modal Simulation Methods. in SAE Technical Paper., 2018-01-1513, ISNVH 2018 - 10th International Styrian Noise, Vibration & Harshness Congress, Graz, Austria, 20/06/18. https://doi.org/10.4271/2018-01-1513
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abstract = "Increasing demands on automotive comfort as well as diminishing vehicle noise levels draw new attention towards low-frequency vibration and noise issues of disk brake systems such as creep groan and moan. In view of this problem, the experimental investigation of relevant phenomena is within the scope of this article. The related experiments concerning two different setups have been performed at a drum driven suspension and brake test rig. Both assemblies consisted of a front axle corner including all parts of the integrated brake system. In order to gain understanding of characteristic triggering mechanisms and fundamental subsystem interactions, and moreover, to verify the suitability of modal methods for simulative evaluations of creep groan or moan, specifically elaborated Operating Deflection Shape (ODS) techniques have been applied. Via analyses of four different creep groan emergences, global stick-slip cycles between disk and pads are revealed. For two dissimilar vibrations in the typical frequency range of moan, mechanisms rather associated with dynamic instabilities are identified. Based on measurement results and further theoretical considerations, the suitability of a disk brake Complex Eigenvalue Analysis (CEA), which is a linear modal simulation method designated to efficiently evaluate disk brake squeal noise, is verified with respect to the relevant friction-induced low-frequency phenomena. Even though the disk brake CEA is inappropriate to estimate a highly non-linear behavior such as involved in all four creep groan signatures, its application for accompanying damped natural oscillations as well as for both observed moan appearances is plausible. By investigation of characteristic pad vibration patterns and speeds belonging to the disk rotation, generic parameter spaces for the utilization of modal methods on harmonic low-frequency phenomena are deduced.",
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