Analysis Methods for Improving NVH Behavior of Porsche High Performance Disc Brakes - Visualization of Noise Emission 2003-01-3322
Vibration analysis of squealing brake systems under actual running conditions is a common tool for getting familiar to deflection shapes and to give straight forward hints, where and how a given system of brake and chassis might be sensitive to design evolutions.
These experimental approaches -typically using accelerometers, laser-interferometry or the like- give detailed information about vibrational behavior of the structure.
In contrast to this, an acoustical method as the so-called „acoustic camera” gives additional information by detecting noise sources.
As can be seen from comparisons of vibrational and acoustical methods, there is not a simple connection between structure deflection and actual emission of noise.
Examples are shown, what the acoustical method gives as extra information and where its limitations are.
Additional benefit is expected from artificial excitation rather than running conditions, which is discussed.