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将一种直线型压电驱动器作为解除保险的作功元件用在机电式引信安全系统中,实现炮口保险距离的可控。对压电精密驱动器运动机理进行了分析,并给出其在引信安全系统中的作用方式。理论分析了引信在勤务处理和发射过程中的典型环境力对压电驱动器构件的影响,并采用AVEX冲击试验台对压电驱动器进行冲击试验。研究结果表明:压电驱动器可承受勤务处理中15.25m高度落向钢板的冲击惯性力的作用;能够抵抗弹丸转速为15000r/min下的离心力而使动子运动到位;可承受1.5×104g的后坐冲击加速度。研究结果为压电精密驱动器在引信安全系统中的使用提供了理论依据,同时该方案为炮口保险距离的可控性提供了新思路。 相似文献
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提出了利用压电谐振机理实现超低频振动传感器的实用方法,通过对压电谐振式传感器机理分析研究,得出可测超低频范围可以在0~3Hz.对该超低频振动传感器的具体电路、工作原理以及模拟结果进行了系统的分析与阐述. 相似文献
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压电陶瓷能将弹药发射环境中的机械能转换为电能,压电电源就是基于此特性为引信供电的环境能源。提出一种压电发电建模方法,利用其对引信压电电源的发电特性进行了理论研究。共包括两个步骤:利用总能量求偏导法推导出并联压电叠堆产生的电压、电荷及电能公式;将压电结构发电模型等效为电路形式,利用电路知识分析得到压电电源的电能输出表达式。然后利用MATLAB软件进行了数值仿真分析,最后以所得理论模型为指导、以最大化提高发电量为目的进行压电电源的设计。 相似文献
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以x切割薄片石英晶片为压电元件,构造了三明治结构的压电应力传感器。在SHPB实验装置上,对一维应力条件下薄片石英应力传感器的动态压电系数进行了标定,得到了传感器的压电系数为2.58±0.03pC/N。将该传感器作为压杆式应力计的工作元件,成功测量了片炸药爆炸传入杆中的应力波。 相似文献
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为测量灌封热冲击下引信内温度场变化,讨论利用阵列式传感器进行引信内腔不同层面关键点温度场信号采集;设计了信号调理、转换电路;采用Labview构建的软件系统进行信号数据的处理和显示.提出了基于虚拟仪器的模拟环境测试方法.研究和用户试验结果表明,该系统满足引信内空间多路温度场采集、存储与处理需求,达到较高的测试精度要求. 相似文献
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压电陶瓷元件因疲劳破坏而失效是造成高频发射换能器损坏的重要原因之一。以一款高频换能器为例分析了换能器功率疲劳现象和压电陶瓷功率疲劳机理;针对高频换能器水中阻抗与空气中阻抗比较接近的特点,设计了空气中大功率发射以加速复现功率疲劳的实验方法,制作了实验样机;实验较好地复现了电导值下降、发送电压响应下降的功率疲劳故障现象,验证了发射功率是换能器功率疲劳的主要因素。当发射功率较大时,散热环境是诱发功率疲劳的重要因素。为避免换能器产生功率疲劳,必须重视发射功率、工作环境和散热情况;发射功率越大对工作环境散热要求越高。 相似文献
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Piezoelectric transducers have effectively been used for force measurement due to their inherently large stiffness. The primary transduction parameter of piezoelectric transducer is voltage which is used mostly for dynamic and sometimes for quasi-static force measurement. Other parameters of piezoelectric transducers such as resonant frequency, electrical impedance, etc. have also been used for force measurement. In the present work, precision measurement of conductance of a radial mode piezo-resonator has been carried out under different static loading and the resultant change in resonant conductance of the resonator have been evaluated as a function of loading force. This method based on resonant conductance measurement can prove to be effective in measuring forces between two interfaces which is an important requirement in many scientific and technical problems. 相似文献
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Tang SC Clement GT 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》2008,55(2):359-367
The aim of this study is to evaluate the feasibility of using harmonic cancellation for a therapeutic ultrasound transducer excited by a switched-mode power converter without an additional output filter. A switching waveform without the third harmonic was created by cascading two switched-mode power inverter modules at which their output waveforms were pi/3 phase shifted from each other. A PSPICE simulation model for the power converter output stage was developed. The simulated results were in good agreement with the measurement. The waveform and harmonic contents of the acoustic pressure generated by a 1-MHz, self-focused piezoelectric transducer with and without harmonic cancellation have been evaluated. Measured results indicated that the acoustic third harmonicto- fundamental ratio at the focus was small (-48 dB) with harmonic cancellation, compared to that without harmonic cancellation (-20 dB). The measured acoustic levels of the fifth harmonic for both cases with and without harmonic cancellation also were small (-46 dB) compared to the fundamental. This study shows that it is viable to drive a piezoelectric ultrasound transducer using a switched-mode power converter without the requirement of an additional output filter in many high-intensity focused ultrasound (HIFU) applications. 相似文献
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Comparison of barrel-stave sonar transducer simulations between a coupled FE-BEM and ATILA 总被引:1,自引:0,他引:1
Soon Suck Jarng 《IEEE sensors journal》2003,3(4):439-446
An acoustic analysis of a barrel-stave sonar transducer has been performed using a coupled finite element-boundary element method developed by the author. The dynamics of the piezoelectric flextensional sonar transducer is modeled in three dimensions and is analyzed with external electrical excitation conditions. Different results are available such as steady-state displacement modes, underwater directivity patterns, resonant frequencies, and transmitting voltage responses. The results of this analysis were then compared and found to be in good agreement to the same analysis performed using ATILA. 相似文献
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压电圆管换能器是水声领域中广泛应用的换能器之一,它一般采用压电圆管的径向振动模态。利用压电圆管的径向振动模态和高阶振动模态来实现圆管的宽带发射性能。采用有限元方法对圆管换能器进行了分析,利用ANSYS软件建立圆管换能器的有限元模型,并对其进行结构优化。最终所制作换能器的径向谐振频率为47.5kHz,其工作带宽为40~80kHz,发送电压响应起伏不超过±4dB,最大发送电压响应为150dB。研究结果表明:所采用的有限元法计算结果与测试结果吻合较好,换能器实现了高频、宽带、水平无指向性的发射性能。 相似文献
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Wei-Tsai ChangYing-Chung Chen Re-Ching LinChien-Chuan Cheng Kuo-Sheng KaoBing-Rung Wu Yu-Chang Huang 《Thin solid films》2011,519(15):4687-4693
This study investigates the feasibility of a high-performance ZnO piezoelectric transducer for wind-power generation applications. The piezoelectric transducer is constructed of a Cu/ZnO/ITO/PET structure. Closely examining the ITO/PET substrate by a nano indenter reveals a low Young's modulus of 6.62 Gpa for specific deflections. The ZnO piezoelectric film of 965 nm is deposited on ITO/PET substrate using a RF magnetron sputtering system at room temperature. A copper layer is attached to the ZnO/ITO/PET structure to construct piezoelectric transducers. Both scanning electron microscopy and X-ray diffraction indicate that, among the favorable characteristic of the ZnO piezoelectric film include a rigid surface structure and a high c-axis preferred orientation. According to cantilever vibration theory, a transducer with a cantilever length of 9.9 mm and vibration area of 1.5 cm2 is designed for natural wind. An appropriate mass loading of 0.57 g on the cantilever is critical for increasing the vibration amplitude and promoting the generated power of a piezoelectric transducer. Finally, an open circuit voltage of 1.87 V for the ZnO piezoelectric transducer at a vibration frequency of 100 Hz is obtained by an oscilloscope. After rectifying and filtering, the output power of the generator exhibits an available benefit of 0.07 μW/cm2 with the load resistance of 5 MΩ. 相似文献
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将结构拓扑优化引入压电分流振动抑制中,以压电元件的分布面积为设计变量,压电元件产生的电荷最大化为优化目标,对压电元件的拓扑进行了优化以获得最佳抑振效果。针对悬臂梁结构,得到了对不同的结构模态进行抑制时的压电元件最优拓扑构型。建立了带有压电分流阻尼系统的悬臂梁振动控制实验模型,将压电元件拓扑优化后的压电分流阻尼系统应用于悬臂梁多阶弯曲模态的振动响应抑制实验,并对比分析了带最优拓扑和非优拓扑压电元件的悬臂梁压电分流阻尼抑振效果。结果表明,对压电元件进行拓扑优化可以明显提高压电分流阻尼系统的抑振效果。 相似文献
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A high sensitivity hydrostatic piezoelectric transducer based ontransverse piezoelectric mode honeycomb ceramic composites 总被引:1,自引:0,他引:1
Zhang Q.M. Wang H. Zhao J. Fielding J.T. Jr. Newnham R.E. Cross L.E. 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》1996,43(1):36-43
A new piezoelectric composite transducer based on the ceramic honeycomb structure is introduced. The transducer is operated in the transverse piezoelectric (TP) d31 mode. The ceramic honeycomb configuration enables one to fabricate a TP honeycomb transducer by either embedding a honeycomb ceramic skeleton into a soft polymer matrix to form a composite or by blocking the openings of the honeycomb cells with thin layers of epoxy to form an end-capped honeycomb structure. With the unique honeycomb configuration and TP operation mode, the piezoelectric d33 response of the ceramic is nearly eliminated and the piezoelectric responses from the three orthogonal directions add together when the transducer is subjected to a hydrostatic pressure. As a result, the transducer exhibits exceptionally high hydrostatic piezoelectric response 相似文献