Development of Analytical Methods Applicable to Test Data
Final technical rept.
BOSTON UNIV MA DEPT OF AEROSPACE AND MECHANICAL ENGINEERING
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In a variety of situations, an undesired shock excitation is applied to a master structure that supports shock sensitive equipment. Often, one wishes to design and test a master structure that transmits the least amount of shock energy to the attached equipment. In scaled testing of new designs, a major task is to design and construct equipment emulators - inexpensive mechanical systems which approximately mimic the dynamic behavior of the actual full-scale equipment as seen by the master structure. In this report, the fundamental issues relating to equipment emulation are identified and design guidelines are proposed based on current NAVSEA vibration and shock qualification standards. Furthermore, a new method is presented for assessing the fidelity of equipment emulators and for interpreting test data taken in the presence of imperfect emulators. The proposed approach uses easily obtainable frequency domain impedance descriptions of the master structure and actual equipment at the attachment points. The ideas are illustrated by application to the emulation of commercial-grade electronic cabinets.