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Published in:
2024 | OriginalPaper | Chapter
Calculation of Mass-Normalized Modes for Frequency Response Functions Using Acceleration Degrees of Freedom as References
Authors : Kevin Napolitano, Peter Kerrian
Published in: Topics in Modal Analysis & Parameter Identification, Vol. 9
Publisher: Springer Nature Switzerland
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Abstract
Modal parameter estimation involves solving for mode shapes, damping, and natural frequency. Modal mass can be estimated if drive point acceleration over force (A/F) frequency response functions (FRFs) are available. This paper shows that force over acceleration (F/A) drive point FRFs are also required to calculate modal mass for FRFs with acceleration as references. In practice, F/A FRFs can be obtained either by using drive point accelerations as references or from modal survey tests performed alongside force-limited vibration qualification tests, where force links measure the interface forces. The process will be demonstrated on FRFs from both a simple, lumped-parameter system and on FRF data from test articles.
