DEFINING RESONANT PLATE SHOCK TEST SPECIFICATIONS IN THE TIME DOMAIN

摘要

Resonant plate testing, commonly used for simulating high‐energy pyroshock events in the laboratory, istraditionally defined by a shock response spectrum. This test definition methodology is uniquely differentfrom almost all other shock test methodologies. Most shock test methods are defined in terms of physicalproperties such as drop height, velocity change, impact velocity, charge standoff, pulse duration, orsimilar. In contrast, the shock response spectrum definition for a resonant plate test allows for a widerange of test inputs due to the non‐unique nature of the spectrum transformation. This paper investigatesthe feasibility of defining resonant plate test specifications in terms of temporal parameters rather thanspectral parameters. The paper presents a comparison of two methods to evaluate potential testtolerance ranges. The paper also presents a case for the importance of controlling shock duration as ameans of limiting fatigue damage in the unit under test. Examples are presented comparing peakacceleration and rainflow analysis, showing that the non‐uniqueness of the shock response spectra canlead to substantially different strain results in the unit under test.