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Frequency Domain Structural Analysis Of A Product Having Frequency-Dependent Material Property

  • US 20150308936A1
  • Filed: 04/29/2014
  • Published: 10/29/2015
  • Est. Priority Date: 04/29/2014
  • Status: Abandoned Application
First Claim
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1. A method of conducting frequency-domain structural analysis of a product made of at least in-part frequency-dependent material comprising:

  • receiving, in a computer system having one or more application modules installed thereon, a finite element analysis (FEA) model representing the product subjected to external harmonic excitations, the one or more application modules being configured for a modified mode-superposition technique in frequency-domain structural analysis and the external harmonic excitations being defined in a range of external excitation frequencies;

    partitioning, by the one or more application modules, the range of frequencies into N frequency bands based on a predefined criterion, wherein N is a whole number greater than one;

    designating, by the one or more application modules, a representative frequency for material property calculations and an eigensolution frequency range for upper and lower limits of subsequent eigensolution in each of the N frequency bands;

    extracting, by the one or more application modules, N sets of natural vibration frequencies and associated mode shapes by performing N eigensolutions in respective N frequency bands, each eigensolution using the FEA model with material properties calculated from the corresponding representative frequency and using the upper and lower limits of the corresponding eigensolution frequency range of said each of the N frequency bands; and

    obtaining, by the one or more application modules, steady-state dynamic (SSD) responses of the product via the modified mode-superposition technique that selects and uses corresponding set of the N sets of natural vibration frequencies and mode shapes dependent upon which one of the N frequency bands each of the external harmonic excitations is located.

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