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An experimental study was conducted to characterize the modal response of a test article having closely spaced modes using a scanning laser vibrometer. Single-reference excitation techniques were shown to lack the requisite information to reliably characterize closely spaced modes. Conventional shaker excitation was also shown to alter the underlying dynamics of the test article. Multireference automatic impact hammers were demonstrated to be a reliable means to provide noncontact excitation, which provided ample information to characterize the closely spaced modes of the test article. The tests further showed that by exciting the structure with two impact hammers in each data frame, it is possible to greatly reduce the overall test time associated with the serial nature of measuring response locations with a scanning laser vibrometer.

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Noncontact Modal Testing of Structures with Closely Spaced Modes Using Multireference Impact Testing and Scanning Laser Vibrometry

  • 会议论文

  • 发表日期：

    2025年

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  • Benjamin L. Martins,
  • Joseph M. Jaeckels

摘要

An experimental study was conducted to characterize the modal response of a test article having closely spaced modes using a scanning laser vibrometer. Single-reference excitation techniques were shown to lack the requisite information to reliably characterize closely spaced modes. Conventional shaker excitation was also shown to alter the underlying dynamics of the test article. Multireference automatic impact hammers were demonstrated to be a reliable means to provide noncontact excitation, which provided ample information to characterize the closely spaced modes of the test article. The tests further showed that by exciting the structure with two impact hammers in each data frame, it is possible to greatly reduce the overall test time associated with the serial nature of measuring response locations with a scanning laser vibrometer.