Finite Element Formulations for Coupled Fluid/Structure Eigenvalue Analysis
Abstract
This report summarizes recent work directed toward the development of an effective finite element-based eigensolution capability for coupled fluid/ structure interaction problems in which fluid compressibility is included. Solution of these coupled problems is essential in the evaluation of structural acoustic transmission characteristics and enclosure acoustics. The methods are also of direct relevance to the acoustic radiation problem as well as other forms of time domain analysis. A comprehensive review is made of the four general methods most compatible with existing finite element analysis capability. Several example applications of the different methods are presented to highlight practical considerations. Of the formulations reviewed, a three- field system appears to have the most potential as a general purpose approach, although considerable effort is required in the development of a suitable eigensolver for the system of choice. The report also discusses a number of methods of incorporating concentrated damping in finite element models of acoustic domains. Keywords: Eigenvalues; Natural frequency; Coupling interaction; Vibration; Structural response. Canada.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1989
- Accession Number
- ADA220793
Entities
People
- Thomas A. Vernon
Organizations
- Defence Research and Development Canada