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Absolute Displacement Measurements of a Disc Brake During Self-Generated Noise
Published October 22, 2006 by Society of Automotive Engineers of Japan in Japan
The measurement of in-plane vibration of a noisy disc brake is both difficult to measure and difficult to verify. In the past there has been a reluctance by researchers to accept the contribution of a displacement parallel to the surface of the object, or in-plane displacement, to noise generation. In addition to measuring absolute displacement it has been difficult to isolate the in-plane and out-of-plane components of displacement using either noncontact or conventional displacement measurement techniques. However within the last few years techniques have been developed to allow absolute displacement to be measured. Such systems are now commercially available but validation of these systems remains vague. In parallel with these commercial systems the technique of classical holographic interferometry has been extended to allow examination of both out-of-plane and in-plane displacement of a brake disc during noise. This paper outlines the development and the validation of this system on a disc brake system generating noise.