Electron Induced Discharge Modeling, Testing, and Analysis for SCATHA. Volume II. Comparison of Internal Coupling Produced by Two EID Simulation Techniques

摘要

A combined analytical and experimental program has been carried out to understand, simulate, and model the effects produced by the coupling of space electron induced electrostatic discharges (EID) into satellite structures. The program had five main tasks: to develop a worst case model for EID defined as a current source and to incorporate it into an SGEMP code for coupling analyses; to construct and electrically test a scale model (SCATSAT) of the P78-2 (SCATHA) spacecraft; to make a comparison between test results and model prediction; and to specify a strawman set of electrical test procedures for simulating the response of spacecraft to ESD for incorporation into a Spacecraft Charging Military Standard; to compare the internal response of the SCATSAT to two techniques simulating different aspects of the discharge, the arc itself and the blowoff electrons. The work carried out under the first four tasks is discussed in Volume I of this report. A high fidelity physical electromagnetic model of the SCATHA P78-2 space vehicle has been tested for internal responses to two techniques simulating different aspects of an electrostatic discharge, the arc itself and blowoff of charged particles. The responses measured on the model were compared to responses measured on the P78-2 for a Mil-Std 1541 arc injection to test the models fidelity, with reasonable agreement resulting. The model responses show that simulation of charge blowoff produces larger internal responses per ampere of drive than does a simple arc simulation, except when the arc is coupled directly to the measurement point. (Author)