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Dynamic Behavior and Stiffness Tuning in Solenoid Based Ni-Mn-Ga Transducers

机译：螺线管型Ni-Mn-Ga换能器的动态行为和刚度调整

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Ferromagnetic shape memory nickel-manganese-gallium (Ni-Mn-Ga) has shown tremendous promise as an actuator material due to its large strain and high bandwidth. However, current Ni-Mn-Ga devices are electromagnet based as this configuration allows for an externally applied force perpendicular to the applied field, and are therefore bulky, energy inefficient, and narrowband. We investigate the dynamic response of Ni-Mn-Ga driven by a solenoid transducer in which the magnetic field is aligned collinearly with the loading stress. The work fo-cusses on the quasistatic and dynamic testing of a Ni_(50)Mn_(28.7)Ga_(21.3) sample which is believed to have an internal stress field which plays the role of the restoring force necessary for reversible strains. This sample is shown to exhibit reversible compressive strains of-0.41% with no external forces applied. Several experimental apparatus are used in order to verify these results. The measurements demonstrate a 231% change in stiffness with applied dc magnetic fields.
机译：铁磁形状记忆镍锰镓（Ni-Mn-Ga）由于其大应变和高带宽而显示出作为致动器材料的巨大希望。然而，当前的Ni-Mn-Ga器件是基于电磁体的，因为这种配置允许垂直于所施加场的外部施加力，因此体积大，能量效率低且窄带。我们研究了螺线管换能器驱动的Ni-Mn-Ga的动态响应，其中磁场与加载应力共线排列。该工作着重于对Ni_（50）Mn_（28.7）Ga_（21.3）样品的准静态和动态测试，该样品被认为具有内部应力场，该应力场起着可逆应变所需的恢复力的作用。该样品显示出未施加外力的可逆压缩应变为-0.41％。为了验证这些结果，使用了几种实验设备。测量结果表明，施加直流磁场后，刚度变化了231％。

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