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Critical Torsional Oscillations of a Rotating Accelerated Shaft

Biot, M. (1932) Critical Torsional Oscillations of a Rotating Accelerated Shaft. Proceedings of the National Academy of Sciences of the United States of America, 18 (12). pp. 682-689. ISSN 0027-8424. http://resolver.caltech.edu/CaltechAUTHORS:BIOpnas32

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Abstract

We assume that the forces applied to the shaft have a variable part which is a moment of constant amplitude M(x) per unit length, distributed along the shaft, and varying with a frequency proportional to the angular velocity. From the solution corresponding to the harmonic steady state vibration, we deduce, by using Heaviside's expansion, the motion due to a sudden application of the moment M(x). This enables us to compute the effect of the moment when applied with a linearly increasing frequency. In this analysis the damping will be neglected. In case of a viscous damping the linear character of the equations is not affected and the same method might be used. We did not carry this calculation for two reasons: 1. The exact result will be in general complicated, and involve viscous friction coefficients which will not be very accurately known. Besides, the effect of friction might be roughly taken into account by considering the steady state solution. 2. In most cases the damping is not viscous but due to the hysteresis or internal friction of the material. This is proved by the experimental fact that the energy absorbed in the vibration of elastic bodies is proportional to the frequency and not to its square. This effect might be taken roughly into account by energetic considerations.


Item Type:Article
Additional Information:Copyright © 1932 by the National Academy of Sciences. Communicated October 17, 1932. Presented at the National Applied Mechanics Meeting, New Haven, June 23-25, 1932.
Record Number:CaltechAUTHORS:BIOpnas32
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:BIOpnas32
Alternative URL:http://www.pnas.org/content/vol18/issue12/
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10380
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:01 May 2008
Last Modified:14 Nov 2014 19:20

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