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Disc and Drum Brake Dynamometer Low-Frequency Noise Test Procedure
- Ground Vehicle Standard
- J3002_202101
- Issued
Downloadable datasets available
Annotation ability available
Sector:
Issuing Committee:
Language:
English
Scope
This test procedure outlines the necessary test equipment (test fixture, dynamometer, data acquisition system, etc.) and test sequence required to test for low-frequency brake noise (200 Hz to 1.25 kHz) on a brake noise dynamometer. It is intended to complement SAE J2521, which focuses on high-frequency brake squeal. This RP applies to passenger cars and light trucks with a gross vehicle weight rating below 4536 kg. Before using this RP for heavier vehicles, consult and agree with the test requestor and the testing facility.
Rationale
The development of this SAE Recommended Practice (RP) was based on a vehicle with known low-frequency noise from field and chassis dynamometer testing. The main test sequence reflected on this RP was able to reproduce on an inertia dynamometer the dominant frequencies measured on the vehicle. During the development of this RP, fixture design and fingerprinting for frequency response, along with the actual test sequence and the data analysis, proved to be the three main elements to allow the measurement and detection of noisy brake events below 1 kHz.
Recommended Content
Topic
Data Sets - Support Documents
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Table 1 | Fixture levels and components required | |
Table 2 | Speeds and times for speed profile SP2 at constant pressure | |
Table 3 | Speeds and times for speed profile SP10 at constant pressure | |
Table 4 | Test sequence |
Issuing Committee
The Brake NVH Standards Committee of the Foundaiton Brake Steering Committee develops and reviews information reports, recommended practices and standards related to brake NVH testing in the laboratory and in vehicles. Included are passenger car and light truck transportation.
Reference
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