Integration of pulsed-laser ESPI with spatial domain modal analysis

Article type: Research Article

Authors: Auweraer, H. Van der | Steinbichler, H. | Haberstok, C. | Freymann, R. | Storer, D.

Affiliations: LMS International, Interleuvenlaan 68, B-3001 Leuven, Belgium | Labor dr. Steinbichler, Neubeuern, Germany | BMW AG, München, Germany | Centro Ricerche Fiat, Orbassano (TO), Italy

Note: [] Corresponding author. Tel.: +32 16 384 200; Fax: +32 16 384 350; E-mail: herman.vanderauweraer@lms.be

Abstract: The present paper discusses the various critical elements of a modal testing system based on pulsed-laser holographic ESPI measurements. Such system allows making very high spatial resolution measurements on panel-like structures at frequencies that are of relevance for the vibro-acoustic behavior. Next to the optical parts, the integration with the modal analysis procedure, including the integration of geometry and response information, is reviewed. The ESPI based Image-domain frequency response functions are accumulated frequency by frequency. Special attention is paid to the modal parameter extraction of the large DOF number data, for which a special data reduction scheme was developed. The approach has been applied to several case studies related to car panels. The research was conducted in the context of the Brite/Euram project SALOME and the EUREKA project HOLOMODAL.

Journal: Shock and Vibration, vol. 9, no. 1-2, pp. 29-42, 2002