Brake NVH, Measurement, and Testing
Duration: 1 Day
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Hotel & Travel Information
Brake noise, vibration, and harshness (NVH) has been a persistent problem for the automobile manufacturers and their suppliers, with warranty claims for brake noise and vibration issues totaling more than $100 million per year for each manufacturer. The measurement of brake noise has evolved from trial and error to a precise process over the last decade. This seminar provides a concise summary of current measurement techniques and a disciplined means to classify brake noise. Examples of standard measurements and results, as well as standard procedures for such measurements, will be described. Attendees will have the opportunity to observe demonstrations in an actual brake dynamometer laboratory. The information provided will serve as an excellent foundation for understanding and resolving brake NVH issues.
Learning Objectives
By attending this seminar, you will be able to:
- Describe the components of a NVH brake test dynamometer
- Configure and perform vehicle brake NVH tests combining performance and NVH measurements to define the conditions at which noise occurs
- Utilize SAE J2521, the only international standard for brake NVH evaluation
- Interpret basic noise and vibration data in the time and frequency domain
- Implement strategies to reduce brake NVH
Who Should Attend
The information in this course is relevant to a wide audience, from the brake test technician who seeks to understand more about NVH and brake NVH testing, to the experienced brake NVH engineer who wishes to know more about the details of the tests performed and the meaning of the results. Brake development and brake component engineers who are not familiar with brake NVH testing will also find the course beneficial. Management level personnel with brake test and evaluation responsibilities will also find this course useful in understanding the scope and importance of the test processes.
Prerequisites
Participants should have a basic familiarity with brake hardware and basic terminology.
Topical Outline
- Basic Noise and Vibration
- Definition of noise and vibration
- Basic terminology
- Spectral analysis
- Modal analysis
- Sound radiation
- Sound propagation in air and structures
- Basic Noise Characteristics
- Different types of brake noise
- Why do brakes make noise?
- Source, path, and receiver description
- Basic considerations in treating noise issues
- Basic Dynamometer Testing
- Test set-up
- SAE J2521
- Data analysis and reporting
- On-Road Brake Testing
- Basic instrumentation
- Capturing source and response data
- Data analysis and reporting
- Brake NVH Investigations (Presentations and Demos)
- Pad damping measurements
- Sound quality
- Identifying sources of noise problems
- Future Trends in Brake NVH Measurements
- Chassis dynamometers
- Combined noise and vibration measurements
- Multiple input system models
Instructor(s): James Thompson
Dr. James K. Thompson is currently the Great Lakes Region Manager at Brüel & Kjaer. He was previously the Executive Director of NVH, Sales, and Marketing at Link Engineering Company where much of his work focused on vehicle braking system noise and vibration. Dr. Thompson's experience also includes positions as General Manager for Engineering Services for Automated Analysis Corporation, Chief Engineer for Acoustics and Engineering Mechanics for Goodyear Tire and Rubber Company, and faculty member of mechanical engineering at Louisiana State University.
Dr. Thompson currently serves as the INCE-USA Vice President for Publications, Chairman of the SAE Brake NVH Standards Committee and Vice Chairman of the 2009 Noise and Vibration Conference. He has over 30 publications and regularly chairs sessions at the SAE Brake Colloquium, the SAE Noise and Vibration Conference, and the IMechE Braking Conference. Dr. Thompson received his B.S. and M.S. in Mechanical Engineering from Virginia Polytechnic Institute and State University and his Ph.D in Mechanical Engineering from Purdue University.
Fees: $725
; SAE Members: $653
.7 CEUs
For additional information, contact SAE Customer Service at 1-877-606-7323 (724/776-4970 outside the U.S. and Canada) or at CustomerService@sae.org.
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