Estimation of the auto frequency response function at unexcited points using dummy masses

Naoki Hosoya, Shinji Yaginuma, Hiroshi Onodera, Takuya Yoshimura

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

If structures with complex shapes have space limitations, vibration tests using an exciter or impact hammer for the excitation are difficult. Although measuring the auto frequency response function at an unexcited point may not be practical via a vibration test, it can be obtained by assuming that the inertia acting on a dummy mass is an external force on the target structure upon exciting a different excitation point. We propose a method to estimate the auto frequency response functions at unexcited points by attaching a small mass (dummy mass), which is comparable to the accelerometer mass. The validity of the proposed method is demonstrated by comparing the auto frequency response functions estimated at unexcited points in a beam structure to those obtained from numerical simulations. We also consider random measurement errors by finite element analysis and vibration tests, but not bias errors. Additionally, the applicability of the proposed method is demonstrated by applying it to estimate the auto frequency response function of the lower arm in a car suspension.

Original languageEnglish
Pages (from-to)14-27
Number of pages14
JournalJournal of Sound and Vibration
Volume337
DOIs
Publication statusPublished - 2015 Feb 17

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ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Acoustics and Ultrasonics
  • Mechanical Engineering

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