Accession Number : ADA329708

Title :   On-Line Impact Identification of Composite Structures Using Built-In Piezoelectrics

Descriptive Note : Final rept. 15 Jan 94-14 Jan 97

Corporate Author : STANFORD UNIV CA DEPT OF AERONAUTICS AND ASTRONAUTICS

Personal Author(s) : Chang, Fu-Kuo ; Tracy, Michael J.

PDF Url : ADA329708

Report Date : 18 JUN 1997

Pagination or Media Count : 108

Abstract : A method is introduced to identify an unknown impact on a composite plate. The identification includes the impact location and force time history. A distributed piezoelectric sensor array measures the plate response to the impact. An optimization technique solves the identification problem. The technique identifies the impact by comparing the calculated model response to the measured response. The identification method was implemented in the computer code IDIMPACT. To verify the identification system, many impacts were distributed on a 36-inch by 30-inch composite plate with a distributed surface-mounted piezoelectric sensors. The code proved to be a reliable and accurate identification system. The average error in the reported impact was .56 inch, and the average error in the energy of the force reconstruction was 15%.

Descriptors :   *IMPACT, *IDENTIFICATION SYSTEMS, *PIEZOELECTRIC GAGES, COMPUTER PROGRAMMING, ACCURACY, COMPOSITE STRUCTURES, PLATES, ONLINE SYSTEMS.

Subject Categories : Test Facilities, Equipment and Methods
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE