Multi-Mode Random Response Analysis Procedure
Abstract
A frequency domain procedure for solving large-scale, multi-mode, multi-force, random vibration problems is described. The study was motivated by the need to perform transonic buffet load analyses for the Delta II/Global Positioning System (GPS) vehicle, for which wind-tunnel tests had been performed to collect fluctuating pressure data. The procedure can be applied to random response problems which are described by a general set of parameters. These include random support-excitation (base-shake) problems typical of component test situations. The main features of the procedure and the corresponding computer program, when compared to traditional procedures, are that, by taking advantage of modern computational capabilities, information such as frequency- dependent power spectral densities and cross-power densities can be used. To establish confidence in the implementation of the procedure, results from test problems were compared to values obtained by directly integrating the equations of motion in the time domain. These test problems, one of which was the Delta II/GPS, also demonstrate the feasibility of performing a buffet loads analysis in the time domain. Keywords: Buffeting, Launch vehicle loads, Random vibration, Spacecraft loads.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1990
- Accession Number
- ADA230457
Entities
People
- Alvar M. Kabe
- Peter Broussinos
Organizations
- The Aerospace Corporation