Methodology for defining shock tests based on shock response spectra and temporal moments

摘要

Defining acceptable tolerances for a shock test has always been a problem due in large part to the use of Shock Response Spectra (SRS) as the sole description of the shock. While SRS do contain a wealth of information if one knows what to look for, it is commonly accepted that different agencies can generate vastly different time domain test inputs whose SRS all satisfy the test requirements within a stated tolerance band. At an even more basic level, the laboratory test specifications often fail to resemble the field environment even though the SRS appear to be similar. A concise means of bounding the time domain inputs would be of great benefit in reducing the variation in the resulting shock tests. This paper describes a methodology that uses temporal moments to improve the repeatability of shock test specifications.