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TRANSMISSION NOISE REDUCTION USING HOLOGRAPHIC SOURCE IDENTIFICATION AND CONSTRAINED LAYER DAMPING
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English
Abstract
As the noise of various vehicle components is reduced, transmission noise will become more apparent. Most transmission noise is generated by vibration of the transmission housing caused in turn by meshing of gear teeth. To effectively reduce airborne noise eminating from the housing, the critical areas of the housing that act as speakers must be identified.
A photographic technique using laser light, called Double-Pulsed Holography, has been adapted for this purpose. A five-step test program has been successfully completed and has resulted in a quieter prototype through use of constrained layer damping materials at critical points on the transmission housing. Thus, it is expected that holography will be a very useful tool in locating housing areas which are the source of airborne noise.
Authors
Citation
Hera, R., "TRANSMISSION NOISE REDUCTION USING HOLOGRAPHIC SOURCE IDENTIFICATION AND CONSTRAINED LAYER DAMPING," SAE Technical Paper 790363, 1979, https://doi.org/10.4271/790363.Also In
References
- Hickling Robert “Regulation and Control of Ground Vehicle Noise” G.M. Research Laboratory Report Fluid Dynamics Research Department Warren, Michigan November 1977
- Staadt Richard L. “Truck Noise Control” The Twentieth L. Ray Buckendale Lecture, presented at the SAE Automotive Engineering Congress and Exposition Detroit,Michigan February 1974
- Rudny D. F. “Meeting European Noise Regulations for Rubber-Tired Front End Loaders” Paper 760599 presented at SAE West Coast Meeting San Francisco, California August 1976
- Palmer W. E. Fuehrer R. R. “Noise Control in Planetary Transmissions” Paper 770561 presented at SAE Earthmoving Industry Conference Central Illinois Section Peoria, Illinois April 1977
- Evensen D. A. Aprahamean R. Overoye K. R. “Pulsed Differential Holographic Measurements of Vibration Modes of High-Temperature Panels” NASA Contractor Report NASA CR-2028 National Aeronautics and Space Administration Washington, D. C. June 1972
- Felske A. Happe A. “Vibration Analysis by Double-Pulsed Laser Holography” Paper 770030 presented at the SAE International Automotive Engineering Congress and Exposition Detroit, Michigan February 1977