Abstract:To realize the recovery function of the fuze safety system state and meet the needs of the global safety control of the fuze, a duplex piezoelectric drive is proposed for application in electromechanical safety systems. Firstly, the bipedal piezoelectric drive was referred to and the structure design of the duplex piezoelectric drive was carried out according to the design requirements, and the working mechanism was analyzed. Subsequently, the structure of the designed duplex piezoelectric driver was optimized, and the motion trajectory equation of the driving foot was given based on the optimization results, which ensures that the driving foot forms an elliptical-like motion trajectory. Then, an experimental platform was built to test and analyze the drive characteristics of the duplex piezoelectric drive prototype. The optimal working frequency was determined, and the relationship curve between the round-trip motion speed and the excitation voltage peak-peak of the duplex piezoelectric driver was obtained. Finally, in consideration of the high impact working environment of the fuze, the anti-high overload measures of the duplex piezoelectric driver were proposed, and the anti-high impact overload test of the piezoelectric driver was carried out. The results showed that the motion speed of the piezoelectric driver is positively correlated with the peak-to-peak excitation voltage, and the movement speed of the piezoelectric driver exhibits the optimal motion speed under the action of the excitation voltage with a frequency of 130 Hz. The duplex piezoelectric drive was able to work properly under the shock load of 20 kg, which verifies the effectiveness of the anti-high overload measures. Furthermore, the feasibility of the duplexed piezoelectric drive in achieving the recovery funtion of the fuze safety state was further verified.