RESPONSE OF SYSTEMS TO RANDOM EXCITATION - A REVIEW
Abstract
The dynamic environments to which weapon-vehicle systems are subjected include steady state harmonic excitation, shock and random excitation. These occur as a result of external stimuli such as atmospherically borne disturbances (wind, wake acoustic noise, rotor tip vortex loading) and through various weapon-vehicle interactions. The report summarizes the probability techniques necessary for and their application to the development of analytic methods for obtaining the response of linear elastic structures to certain classes of random excitation. This random vibration response analysis employs the normal modes of a lumped parameter representation of a complex system. The random forcing functions at each node (in terms of expected value and power spectral density) are transformed to a set of modal forcing functions. Then the response of each mode to a random forcing function can be obtained using the modal transfer functions. Finally the modal responses are transformed back to the physical plane. The results are the statistical expected values (mean, root mean square, power spectral density) of the displacements, velocities and accelerations of the physical system.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1970
- Accession Number
- AD0700703
Entities
People
- W. F. Ames
Organizations
- University of Iowa