Transducer inertia and stinger stiffness effects on FRF measurements

Kenneth G. McConnell; Paolo Cappa

Transducer inertia and stinger stiffness effects on FRF measurements

Kenneth G. McConnell, Paolo Cappa

Ospedale Pediatrico Bambino Gesu

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

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 language	English
Title of host publication	Proceedings of the International Modal Analysis Conference - IMAC
Editors	Anon
Publisher	SEM
Pages	137-141
Number of pages	5
Volume	1
Publication status	Published - 1999
Event	Proceedings of the 1999 17th International Modal Analysis Conference, IMAC. Part 1 (of 2) - Kissimmee, FL, USA Duration: Feb 8 1999 → Feb 11 1999

Other

Other	Proceedings of the 1999 17th International Modal Analysis Conference, IMAC. Part 1 (of 2)
City	Kissimmee, FL, USA
Period	2/8/99 → 2/11/99

ASJC Scopus subject areas

Engineering(all)

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abstract = "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.",

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AU - McConnell, Kenneth G.

AU - Cappa, Paolo

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AB - 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.

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BT - Proceedings of the International Modal Analysis Conference - IMAC

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T2 - Proceedings of the 1999 17th International Modal Analysis Conference, IMAC. Part 1 (of 2)

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