Effect of Measurement-System Phase Response on Shock-Spectrum Computation

摘要

One of the standard methods for characterizing mechanical shock is by means of the shock spectrum. The principal application of the shock spectrum in aerospace technology is to permit component shock test specifications to be generated, independent of specific time histories. Inattention to the dynamics of the instrumentation system used to measure mechanical shock can result in distorted test data. Erroneous component test specifications will originate from shock spectra calculations based on these distorted data. Measurement system design is frequently based upon amplitude response considerations with phase response ignored. In structural testing, nonlinear phase response in measurement systems results in distorted transient data being recorded for analysis with resultant error in the computed shock spectra. Design guidelines are provided to preclude these errors from occurring. (ERA citation 08:002718)