Validation of the Transient Finite Energy Shock Predictor to NASA’s ShockSat Test

Shock loading is defined as a sudden and intense application of a force to a structure. The shock force is characterized by its high magnitude and short duration, resulting in a rapid change in the structure’s strain and stress state that can cause damage. Accurate prediction of the dynamic response due to shock loading has been a NASA and industry priority for the last several decades. Shock environments are defined in terms of an absolute acceleration shock response spectrum specification. The Transient Finite Energy Shock Predictor constructs a forcing function, a finite energy quantity, that can reproduce this shock response spectrum specification at the drive point. Transfer accelerance frequency response functions are then utilized to propagate this forcing function to all desired output locations. The method utilizes three domains—frequency, time, and the shock spectrum domains—with core calculations utilizing impedance methods to preserve phasing. The method offers flexibility to operate with either model-derived or test-derived accelerances. The Transient Finite Energy Shock Predictor has been validated using NASA’s ShockSat test. Both the model- and test-based variations are exercised. All comparisons show excellent agreement. The Transient Finite Energy Shock Predictor delivers a rigorously validated, phase-accurate, and energy-consistent method to predict shock environments with confidence across both model-based and test-based workflows.