板状形状記憶合金の座屈を用いたパッシブ防振装置に関する研究

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  • Study on a Passive Vibration Isolator for Vertical Direction Using Post-buckled Shape Memory Alloy Beam

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<p>In this report, static restoring force of a post-buckled Titanium–Nickel-based shape memory alloy plate is experimentally investigated and dynamic property of a passive vibration isolator for vertical direction using post-buckled shape memory alloy is investigated. From the static restoring force measurement test, we newly detected that Ti-Ni-base shape memory alloy plate reveals a negative tangent stiffness in a certain deflection range in post-buckled state as well as hysteresis behaviour. Also, the restoring force and the tangent stiffness varies depending on the temperature of the shape memory alloy. By applying these characteristics to a vibration isolator for vertical direction, it is expected that high performance isolator would be realized. That is, by combining post-buckled shape memory alloy plate with a general linear spring, of which spring constant is tuned so that the negative stiffness of the shape memory alloy plate would be just canceled, quasi-zero stiffness would be realized. Finally in this report, we propose the conceptual design of an isolator using post-buckled shape memory alloy and the isolation performance is experimentally investigated.</p>

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