Active Modal Coupling of a Nitinol Langevin Transducer
Active Modal Coupling of a Nitinol Langevin Transducer
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DOI：
10.1109/ius51837.2023.10306433
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发表时间：
2023-09
期刊：
影响因子：
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通讯作者：
Yuchen Liu;Mahshid Hafezi;A. Feeney
中科院分区：
文献类型：
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作者：
Yuchen Liu;Mahshid Hafezi;A. Feeney
朗之万换能器被广泛用于功率超声应用。它的基本结构包括一个前质量块、一个后质量块、锆钛酸铅环、电极和一个预加载螺栓。最近的研究Langevin超声致动器集中在模态耦合，如利用弯曲-弯曲耦合模式和弯曲-弯曲耦合模式来产生复杂的输出运动。然而，一个挑战是，通常由于组装和加工不一致，在要耦合的模式之间通常存在显著的频率差异。因此，主动模态耦合的方法，提出了克服这一点，使用形状记忆合金镍钛诺。镍钛诺的弹性模量取决于温度，这意味着Langevin传感器的关键部件的动力学可以通过适度的温度变化来主动控制。在这项研究中，镍钛合金朗之万传感器的制造，其温度依赖的动态特性进行了研究。在大约100°C的足够宽的温度范围内，研究了两个面外模式的谐振频率附近的导纳、电导和磁阻频率。结果表明，镍钛诺的相变可用于促进包括该材料的朗之万换能器中的主动模态耦合。
The Langevin transducer is widely adopted for power ultrasonic applications. Its basic configuration consists of a front mass, a back mass, lead zirconate titanate rings, electrodes, and a preloading bolt. Recent research of Langevin ultrasonic actuators is focused on modal coupling, such as utilising a bending-bending coupled mode and a longitudinal-bending coupled mode to generate complex output motions. However, one challenge is that there are often notable frequency differences between the modes to be coupled, normally due to assembly and machining inconsistencies. Therefore, an active modal coupling method is proposed to overcome this, using the shape memory alloy Nitinol. The elastic modulus of Nitinol is temperature dependent, which means that the dynamics of key parts of the Langevin transducer can be actively controlled by modest variations in temperature. In this study, a Nitinol Langevin transducer is manufactured, and its temperature-dependent dynamic properties studied. Admittance, conductance, and susceptance frequencies near the resonance frequency of two out-of-plane modes were investigated over a sufficiently wide temperature range around 100°C. The results show that the phase transformation of Nitinol can be used to promote active modal coupling in a Langevin transducer comprising this material.