Transducer inertia and stinger stiffness effects on FRF measurements

Kenneth G. McConnell, Paolo Cappa

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In order to study methods for measuring complete driving point FRF characteristics for forces and moments, it was necessary to evaluate which test technique had the best chances of success. Impulse testing has consistency problems with input magnitudes as well as mixing windows for signal processing. The chirp has excellent signal to noise ratios and generally superior coherence when compared to random testing. It was found that stinger resonance's within the test frequency range and latter outside the test frequency range caused measurement complications for the test structure's highest natural frequent. These complications were effectively predicted using the transducer's inertial properties, the stinger's stiffness properties, and the structure's linear and angular driving point FRF characteristics (as determined from impulse tests) when stinger resonance effects were removed from the chirp data.

Original languageEnglish
Title of host publicationProceedings of the International Modal Analysis Conference - IMAC
Editors Anon
Number of pages5
Publication statusPublished - 1999
EventProceedings of the 1999 17th International Modal Analysis Conference, IMAC. Part 1 (of 2) - Kissimmee, FL, USA
Duration: Feb 8 1999Feb 11 1999


OtherProceedings of the 1999 17th International Modal Analysis Conference, IMAC. Part 1 (of 2)
CityKissimmee, FL, USA

ASJC Scopus subject areas

  • Engineering(all)


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