Micro-jitter attenuation of spaceborne cooler by using a blade-type hyperelastic shape memory alloy passive isolator

摘要

Highlights?This study suggested a novel blade-type passive vibration isolator that exploits the full potential of the superelastic behavior of the shape memory alloy (SMA).?The proposed isolator can provide a low stiffness in on-orbit condition, thus outstanding micro-jitter isolation capability can be expected.?The superelasticity of the SMA helps the isolator to attain the structural safety under launch vibrations.?The basic characteristics of the isolator were investigated through rotational static loading test and free-vibration test at various temperature conditions.?The effectiveness of the isolator in attenuating the micro-jitter induced by cooler operations was evaluated through micro-jitter measurement tests.AbstractIn this study, the primary design objective is to develop a passive isolator that can guarantee structural safety of the cooler assembly in a launch vibration environment without a launch locking mechanism, while effectively isolating the cooler-induced micro-jitter during the on-orbit operation of the cooler. To achieve the design objective, we focused on the utilization of characteristics of the hyperelastic shape memory effects. The major advantage of the isolator is that the micro-jitter isolation performance is much less sensitive to the aligned position of the isolator in comparison with the conventional isolator. Moreover, implementation of an additional 0gcompensation device during a satellite level on-ground test, such asa jitter measurement test, is not required. In this study, the basic characteristics of the isolator were measured using the torque test and free vibration test. The micro-jitter attenuation capability and position sensitivity of the proposed isolator design were validated by the micro-jitter measurement test.]]>