Advanced DAA Methods for Shock Response Analysis
Abstract
Doubly asymptotic approximations (DAA's) are approximate contact- surface relations for the dynamic interaction between a body and an adjacent medium. In this report, first- and second-order DAA's are formulated for an internal acoustic domain, and a first-order DAA is formulated and implemented in boundary-element form for a semi-infinite elastic domain. The new DAA's constitute extensions of DAA's previously formulated and implemented for external acoustic and infinite elastic domains. The accuracy of the internal DAA's is evaluated by comparing DAA and exact solutions for a canonical problem, namely, the excitation of a fluid-filled spherical shell submerged in an infinite acoustic medium by a plane step-wave; in this evaluation, the second- order DAA exhibits satisfactory accuracy. A preliminary evaluation of the first- order DAA for a semi-infinite elastic medium is conducted by comparing boundary- element DAA results with results in the literature for a suddenly pressurized spherical cavity; marginal accuracy is observed. Underwater Shock, Ground Shock, Acoustics, Medium-Structure Interaction. Elasto-Dynamics,
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1992
- Accession Number
- ADA252696
Entities
People
- Brett A. Lewis
- Peizhen Zhang
- Thomas L. Geers
Organizations
- University of Colorado Boulder