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The Mechanical Impedance of Damped Vibrating Systems

Published online by Cambridge University Press:  08 February 2017

R. G. Manley
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Extract

The concept of “mechanical impedance,” a quantity equivalent to Biot's Dynamic Modulus (reference i), has been utilised since 1939 by the de Havilland Aircraft Company as a standard method of treatment of vibration problems inengine airscrew systems, the method being applied principally to torsionalvibrations. In this work the effect of damping forces was neglected, on theassumption that the resonant frequencies of a system are not affected appreciablyby such forces so long as they remain of small magnitude.

The desire to justify this assumption by theoretical reasoning, and to evolve a method of attack for problems in which the damping forces are too large to be neglected, led to the application of the concept of mechanical impedance to damped systems.

Type
Research Article
Information
The Aeronautical Journal , Volume 45 , Issue 371 , November 1941 , pp. 342 - 348
Copyright
Copyright © Royal Aeronautical Society 1941

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References

1. Biot, M. A. “Coupled. Oscillations of Aircraft Engine—Propeller Systems.” Journal of Aeronautical Sciences, Vol. 7, No. 9, July, 1940.Google Scholar
2. Den, Hartog. “Mechanical Vibrations,” 2nd Edition, Chapter II.Google Scholar