Transducer inertia and stinger stiffness effects on FRF measurements

K. G. McConnell, P. Cappa

Research output: Contribution to journalArticlepeer-review


In order to study methods for measuring complete driving point frequency response function (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 and direction as well as mixing windows for signal processing. The chirp has excellent signal-to-noise ratios and generally superior coherence when compared to both random and impulse testing. It was found that stinger resonances within the test frequency range and later outside the test frequency range caused measurement complications for certain test structure natural frequencies. 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
Pages (from-to)625-636
Number of pages12
JournalMechanical Systems and Signal Processing
Issue number4
Publication statusPublished - Jul 2000

ASJC Scopus subject areas

  • Signal Processing
  • Mechanical Engineering


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