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Automotive Brake Noise and Vibration Standard Nomenclature

Brake NVH Standards Committee
  • Ground Vehicle Standard
  • J2786_201712
  • Current
Published 2017-12-20 by SAE International in United States
This document defines various vehicular noises and vibrations that are attributed to being created by the foundation brake components of the vehicle, particularly on passenger cars and light trucks. These definitions cover both disc and drum brakes. The frequency ranges from near zero Hz (tactile sensations) all the way up to 17 kHz, or the upper limit of normal hearing. These noises and vibrations may either directly radiate off the brake system or provide the excitation energy that causes other vehicle components to react.
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Automotive Vehicle Brake Squeal Test Recommend Practice

Brake NVH Standards Committee
  • Ground Vehicle Standard
  • J2625_201707
  • Current
Published 2017-07-24 by SAE International in United States
This procedure is applicable to squeal type noise occurrences for passenger car and light truck type vehicles that are used under conventional operating conditions. For the purposes of this test procedure, squeal is defined as occurring between 900 and 18 000 Hz.
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Brake Insulator Damping Measurement Procedure

Brake NVH Standards Committee
  • Ground Vehicle Standard
  • J3001_201604
  • Current
Published 2016-04-20 by SAE International in United States
This procedure is applicable to modes from 500 and 13,000 Hz. The parameters measured with this procedure are defined as the damping factor, ξ for first nine vibration modes of the beam. The measurement will be done in free-free conditions and with temperature.
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Disc and Drum Brake Dynamometer Squeal Noise Test Procedure

Brake NVH Standards Committee
  • Ground Vehicle Standard
  • J2521_201304
  • Current
Published 2013-04-11 by SAE International in United States
The SAE J2521 procedure is applicable to high frequency squeal noise occurrences for on-road passenger car and light trucks below 4,540 kg of GVWR. The procedure incorporates high temperature and low temperature test matrixes, but does not fully account for the effects of the environment on brake squeal. Much research is currently underway in this area and can potentially be incorporated in future revisions. For the purposes of this test procedure, squeal is defined as peak noise levels equal to or above 70 dB(A) between 1.25 kHz and 16 kHz for tests using a full suspension corners or full axle assemblies, or between 2 kHz and 16 kHz for brakes not using a full suspension corner. Before using this Recommended Practice for chassis dynamometer testing, review in detail the specifics related to at least (a) instrumentation including in-cabin microphones, (b) threshold levels for noise detection, (c) temperature control priority between front and rear axles, (d) vehicle loading and load distribution, (e) cooling air and environmental conditioning, and (f) detailed nomenclature and labeling of channels and…
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Friction Material Elastic Constants Determination through FRF Measurements and Optimization

Brake NVH Standards Committee
  • Ground Vehicle Standard
  • J3013_201210
  • Current
Published 2012-10-09 by SAE International in United States
This SAE Standard specifies necessary procedures and control parameters in estimating anisotropic elastic constants of friction material based on pad assembly FRF measurements and optimization. It is intended to provide a set of elastic constants as inputs to brake NVH simulation, with the objective of ensuring pad assembly vibration correlation between simulation and measurements.
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Automotive Disc Brake Pad Natural Frequency and Damping Test

Brake NVH Standards Committee
  • Ground Vehicle Standard
  • J2598_201207
  • Current
Published 2012-07-16 by SAE International in United States
This procedure is applicable to brake pad modes between 500 Hz. and 16 kHz. The parameters measured with this procedure are defined as the first three natural frequencies, fn (n=1, 2, 3), and the corresponding loss factors, η.
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Verification of Brake Rotor Modal Frequencies

Brake NVH Standards Committee
  • Ground Vehicle Standard
  • J2933_201103
  • Current
Published 2011-03-01 by SAE International in United States
Provide description of standard test methods, analysis methods, and reporting methods for measuring the resonant modes of automotive disc brake rotors and drums for purpose of design and production verification of these components.
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Brake Insulator Damping Measurement Procedure

Brake NVH Standards Committee
  • Ground Vehicle Standard
  • J3001_201102
  • Historical
Published 2011-02-04 by SAE International in United States
This procedure is applicable to modes between 1500 and 15 000 Hz. The parameters measured with this procedure are defined as the damping factor, ξ for first three bending modes of the beam. The procedure will focus on bending modes only.
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Automotive Brake Noise and Vibration Standard Nomenclature

Brake NVH Standards Committee
  • Ground Vehicle Standard
  • J2786_200910
  • Historical
Published 2009-10-02 by SAE International in United States
This document defines various vehicular noises and vibrations that are attributed to being created by the foundation brake components of the vehicle, particularly on passenger cars and light trucks. These definitions cover both disc and drum brakes. The frequency ranges from near zero Hz (tactile sensations) all the way up to 17 kHz, or the upper limit of normal hearing. These noises and vibrations may either directly radiate off the brake system or provide the excitation energy that causes other vehicle components to react.
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Automotive Vehicle Brake Squeal Test Recommend Practice

Brake NVH Standards Committee
  • Ground Vehicle Standard
  • J2625_200802
  • Historical
Published 2008-02-15 by SAE International in United States
This procedure is applicable to squeal type noise occurrences for passenger car and light truck type vehicles that are used under conventional operating conditions. For the purposes of this test procedure, squeal is defined as occurring between 900 and 18 000 Hz.
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