Validating the new equivalent static design method of spacecraft structures in random vibration by test

摘要

Random vibration is one of dynamic environments of spacecraft during launch. In engineering, design load was usually equivalent static load based on 3σ acceleration. A new equivalent static load based on 3σ strain or stress was presented by the writer. To validate the new equivalent static design method, random vibration test was designed including test article and test specification, and signal processing was in time domain; static test was designed to compare static yield strength and dynamic yield strength, and dynamic yield strength was 50% -80% higher than static yield strength; measured data in time domain was analyzed, and the equivalent static design of 3σ strain based on first passage model can be used to spacecraft structure design. And it will decrease the mass of spacecraft structure obviously.