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Reduction of Automobile Booming Noise Using Engine Mountings That Have an Auxiliary Vibrating System
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English
Abstract
This paper presents a new concept concerning engine mountings that can reduce engine booming noise by utilizing an additional vector. Booming noise in passenger cars, particularly those with a four-cylinder engine, is caused by exciting forces such as the second harmonic of engine intertial force.
We have found that exciting forces transmitted from the engine to the body structure through the engine mountings are reduced by adding another vector which cancels out these exciting forces. This new vector can be obtained by using a mass-controlled region of a vibrating system possessing either a single degree or two degrees of freedom. When this optimally designed mechanism is adopted on a small passenger car, booming noise can be significantly reduced.
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Authors
Citation
Sakamoto, H., Yazaki, K., and Fukushima, M., "Reduction of Automobile Booming Noise Using Engine Mountings That Have an Auxiliary Vibrating System," SAE Technical Paper 810399, 1981, https://doi.org/10.4271/810399.Also In
References
- Hiroaki Morimura “Booming Noise Experimental Analysis,” “Measurement and Analysis” - symposium regarding automotive vibration noise held by Japan Society of Automotive Engineering March 1979
- Suzuki Y. et al “Reduction of Interior Car Noise by Using Vector Method,” FISITA ’78 1447
- Hartmut Bathelt Dirk Bösenberg “Neue Untersuchungsmethoden in der Karos-serieakustik” ATZ 78 1976
- Tsukasa Yoshizawa “Design of Rubber Insulators and Selection of Materials” Japan Association of Rubber Industries Bulletin 49