Cable and Damper Vibration Studies

Citation

Pipes, Louis Albert (1936) Cable and Damper Vibration Studies. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/sqk6-y791. https://resolver.caltech.edu/CaltechTHESIS:11122024-164018432

Abstract

The increase in the diameter of the cables used in overhead transmission lines has focused the attention of the Electrical Engineering profession on the mechanical vibrations which are set up in these lines by the action of the wind. These vibrations have been the important cause of failures in many cases

A study of the literature of the subject shows the very haphazard state in which the theory of these vibrations finds itself. It is the purpose of this paper to correlate some of the observed phenomena by a mathematical analysis and hence to place the subject on a more scientific basis.

The thesis concerns itself with an analysis based on certain simplifying assumptions which are well substantiated in practical cases. The analysis comprises the following topics:

1. Imperfect flexibility of conductor.

2. Travelling waves.

3. Damped Vibrations.

4. Forced Oscillations.

5. An Analysis of a Simplified Vibration Damper.

6. The Effect of Movable Extremities.

7. Reflection from a Damper.

8. An analysis of Preswerk's Vibrationless Cable.

The results of the analyses of the various topics discussed are tabulated throughout the body of the paper and the derivation of the equations is carried out in the appendix.

Thesis Files