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8 September 1994 Experiences with scanning laser vibrometry in automotive industries
Bernd Junge
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Proceedings Volume 2358, First International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1994) https://doi.org/10.1117/12.185348
Event: Vibration Measurements by Laser Techniques: First International Conference, 1994, Ancona, Italy
Abstract
For nearly ten years Volkswagen has been applying scanning laser vibrometry for analyzing vibrations and structure-born noise of auto parts, like engines, auxiliaries, gearboxes, and the whole body as well. Compared with holographic interferometry the scanning vibrometry offers the great advantage of measuring operation mode shapes. Operating modes or 'real motions' are unharmonic motions, consisting of more than one frequency component. By applying an FFT- algorithm it is possible to analyze the frequency spectrum of the vibrating structure. This measurement of multiple mode shapes is obtained by only one scanning process, a very time saving procedure. In this paper we present (1) applications of this technique in automotive development, (2) a detailed description of the measurement procedure, (3) a discussion of advantages and disadvantages, and a (4) comparison of specific features of commercially available vibrometers and our own prototype, called SOVAS.
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Bernd Junge "Experiences with scanning laser vibrometry in automotive industries", Proc. SPIE 2358, First International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (8 September 1994); https://doi.org/10.1117/12.185348
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KEYWORDS
Vibrometry
Holographic interferometry
Prototyping
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