Accession Number : ADA186140

Title :   Wave Propagation Experiments on 22-Bay Lattice.

Descriptive Note : Technical rept. 1 Sep 85-1 Jun 87,

Corporate Author : WEA CAMBRIDGE MA

Personal Author(s) : Williams, James H , Jr ; Zhang, Jia J

PDF Url : ADA186140

Report Date : 01 Jun 1987

Pagination or Media Count : 37

Abstract : Wave propagation characteristics of large space structures (LSS) affect their performance, integrity and the ability to nondestructively assess their integrity. In this study, wave propagation characteristics of an aluminum 22-bay planar lattice structure are determined experimentally. Two ultrasonic piezoceramic longitudinal transducers are mounted at various locations on the structure. Wave measurements are obtained by injecting an impulsive load via the transmitting transducer and recording the response via the receiving transducer. The waves injected into the structure are longitudinal waves, transverse to the surface, although a complex stress distribution which may be described by directivity functions is actually realized. The impulsive loading signal has a broad frequency spectrum containing frequencies greater than 0.5MHz.

Descriptors :   *IMPULSE LOADING, *SPACECRAFT, *TRANSDUCERS, *WAVE PROPAGATION, *WAVES, DISTRIBUTION, FREQUENCY, MEASUREMENT, POSITION(LOCATION), SIGNALS, STRESSES, SURFACES, TRANSVERSE

Subject Categories : Unmanned Spacecraft
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE