THE TMB 40,000-POUND, THREE-MASS VIBRATION GENERATOR, ITS DESCRIPTION AND OPERATION,
Abstract
The 40,000-lb, three-mass vibration generator is designed to excite vibrations in large structures. Forces up to 40,000 lb in any direction perpendicular to the axis of rotation and moments up to 120,000 ft-lb can be generated over a frequency range from 0.6 to 20 cps. This report describes the mechanical and electrical parts of the generator and the principle of operation. Forces and moments are varied by adjusting the eccentricity of three rotating masses and changing the speed of rotation. A special adapter indicates the instant of applied peak force or moment. The force and moment output of the vibration generator is large enough to excite ship hull frequencies. It is, therefore, a useful tool for the determination of hull natural frequencies, mode shapes, hull damping, and impedances. It can also be used for vibration surveys of any large structure such as radar mounts and foundations. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1963
- Accession Number
- AD0428521
Entities
People
- Richard L. Price