Utilization of Taped Random Spectra for Vibration Testing.
Final rept. Sep 77-Dec 78,
GRUMMAN AEROSPACE CORP BETHPAGE NY
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Random vibration, a test screen found to be extremely effective for disclosing workmanship problems in various equipment, is also extremely expensive to generate. A technique is conceived for economically producing random vibration utilizing an audio tape deck as a signal source. The concept was proven feasible on a production basis. This study was undertaken to refine the technique, establish its validity for universal application and prepare a step-by-step procedure for its implementation. A series of laboratory tests was conducted on various electronic units to evaluate variations in hardware and determine what impact this could have on the overall approach. In addition, tests were also performed on basic test equipment and tape decks to establish any inherent performance limitations, assess the potential effect on the technique, and develop the compensating factors necessary to mitigate these problems. The results obtained indicate that while some variations were apparent between items of generically identical manufacture and certain test equipment idiosyncrasies existed, compensating factors could be developed to account for these differences. Utilization of the required factors in the construction of a synthetic random tape permitted the generation of random vibration on actual hardware within acceptable tolerances. A detailed procedure was prepared delineating the steps required to construct a synthetic random tape and to employ this type to conduct random vibration acceptance tests.
- Electrical and Electronic Equipment
- Test Facilities, Equipment and Methods