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Impact on Test by Various Multiaxis Excitation

by James F. Cory, Jr., Structural Dynamics Research Corp, Milford, OH, USA,
John R. Hendricks, Structural Dynamics Research Corp, Milford, OH, USA,
William M. Rusen, Structural Dynamics Research Corp, Milford, OH, USA,
David P. Rettig, Structural Dynamics Research Corp, Milford, OH, USA,



Document Type: Proceeding Paper

Part of: Seismic Experience Data?Nuclear and Other Plants

Abstract:

The purpose of this paper is to provide input guidelines in evaluating various types of multiaxis excitation on fragility level testing of electronic devices. There are many variables that must be considered in establishing fragility test programs. This paper is limited to the discussion of three types of multiaxis excitations. This evaluation consists of dependent biaxial tests, independent biaxial tests and triaxial tests. The test inputs were generated by independent random noise sources with a Gaussian distribution. The test sample was a two bay electrical cabinet. Accelerometers were mounted on the outside upper corner and at mid-height inside the cabinet. The problem of fragility testing becomes more complex as the response spectra increases. As the floor level base acceleration axial input increases, the resonance frequencies change throughout the cabinet and the corresponding values of damping were changed (reduction or amplification of energy) due to structural non-linearities.

Subject Headings: Triaxial tests | Excitation (physics) | Electronic equipment | Dynamic structural analysis | Biaxial strength | Response spectra | Impact tests

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