关键词: 兵器科学与技术, 引信, 气流致声, 压电发电机, 激振力

Abstract: In order to meet the requirements of airflow-induced vibration of small piezoelectric generator for fuze, and solve the critical issue of stable excitation force, the key is to effectively control the sensitive parameters of generator structure. The influence of related structural parameters of airflow-induced excitation device on excitation force is analyzed through simulating flow test. The test result shows that the amplitudes of excitation force corresponding to different resonator lengths increase approximately linearly with the airflow velocity, and the longer the length of resonator is, the smaller the slope is, and vice versa. The space between nozzle and resonator and the ring gaps have the complex effects on the amplitude of excitation force , and too big or too small gap would make the amplitude smaller or even no waveform formed. The length of resonator is the main factor impacting on the frequency of excitation force, and the frequency decreases with the increase in the resonator length, presenting an inverse relationship. The space between nozzle and resonator and the ring gaps have less effects on the frequency of excitation force. Therefore, for high airflow velocity, the stable excitation force with high amplitude and frequency can be obtained by short resonator. In addition, reasonable space and ring gaps are also important for ensuring bigger amplitude of excitation force. The resulting sensitive parameter values of sound excitation device can be used as references for engineering design. Key

Key words: ordnancescienceandtechnology, fuze, airflow-inducedsound, piezoelectricgenerator, excitationforce