The driving characteristics of SMA actuators mainly include the range, force and speed of the actuator, and these driving characteristics are determined by the alloy composition and use conditions. The alloy composition and service conditions affect the stress, strain and phase transformation speed of the SMA wire during the phase transformation, and affect the driving characteristics of the SMA wire. Using the shape memory alloy seat drive element with one-way shape memory effect, two-way drive can be realized under the action of bias force. The driving characteristics of alloy wires under the action of different constant loads and bias springs with different stiffness, including the influence laws of driving displacement, driving force and response time.
The paper is intended to overcome the disadvantages of traditional shape memory alloy (SMA) actuator, such as complex structure, the high requirements of installation position and slow response speed. Using the one-way shape memory effect of shape memory alloy wire, a biased two-way flexible actuator with external flexible support was designed. The theoretical feasibility of the design is verified by the establishment of the model and theoretical analysis of the actuator. On the basis of theoretical analysis, experimental verification was carried out, and compared with the theoretical analysis results, the driving characteristics of the actuator were obtained, and the practical feasibility of the actuator was verified.
Aiming at the problems of vibration and noise in automobile design, a study on the use of shape memory alloys (SMA) to suppress the vibration of thin-walled car bodies is proposed. Using SMA to suppress the vibration of the thin-walled structure, an experimental model was designed, and the finite element analysis software was used to perform modal analysis on the thin-walled structure. A number of different SMA layouts were set up, and the layout of the vibration experiment was determined through simulation analysis. form. A vibration experiment test platform was designed and built. Based on the results of modal analysis, multiple sets of thin-walled structure vibration experiments were conducted under different conditions, and the change data of the displacement, velocity and acceleration of the thin-walled structure before and after the use of SMA under external excitation was obtained. . The research results show that the amplitude, speed, and acceleration of the thin-walled plate structure with SMA are reduced by about 50%-70% after the temperature load is applied; the suppression effect is positively correlated with the number of SMA wires used.
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