Compressed Mesh Washer Isolators Using the Pseudoelasticity of SMA for Pyroshock Attenuation

Abstract

Pyroshock can cause malfunctions of electric components of launch vehicles or satellites, resulting in a catastrophic flight failure. This study introduces a new compressed mesh washer pyroshock isolator using the pseudoelasticity of Ni-Ti alloy wire. The compressed mesh washer isolators were manufactured and tested to evaluate their pyroshock isolation performances. For comparison purposes, shape memory alloy compressed mesh washer isolator was also manufactured. The variations in the dynamic characteristic of the compressed mesh washer isolators due to precompressive displacements were also studied. The results showed that the natural frequency and the isolation capacity can be adjusted by controlling the precompressive displacement of the compressed mesh washer isolator. These characteristics can be used for a smart isolation system that utilizes the adjustable dynamic characteristics of the compressed mesh washer isolators.