Free Response and Musical Pitch of Shape Memory Alloy Wires Under Voltage Loading
| Autor: | Wu Jituo, Jing-Han Guan, Yong-Chen Pei, Ci-Lin Yan |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | IEEE Transactions on Industrial Electronics. 69:5009-5017 |
| ISSN: | 1557-9948 0278-0046 |
| Popis: | An experimental setup, on which the shape memory effect is based, is developed to measure the free response frequency and musical pitches of SMA wires. In this paper, the voltage, force, and sound signals of SMA wires are determined simultaneously under two kinds of experiments, constant temperature uniaxial tensile tests and fixed-length thermal cycle tests. Based on constitutive equations and thermodynamic equations, an empirical formula for the driving voltage and the steady-state stress of SMA wires is proposed, and the undetermined coefficients at radii of 0.050 mm and 0.070 mm are determined by experiments. The musical pitches of SMA wires under a constant voltage are obtained by combining the empirical formula with the string vibration equation. The theoretical results are compared with the actual musical pitches measured by the sound signals, and the two have a high degree of coincidence. Just for an SMA wire with a radius of 0.070 mm, the free response frequency range reaches 640 Hz to 1120 Hz, which covers 6 whole musical tones in total. Thus the SMA wire can be used as a string to play simple music. |
| Databáze: | OpenAIRE |
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