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对由两个半波长夹心式压电陶瓷换能器级联而成的双激励全波长压电陶瓷超声换能器进行了研究,给出了这种换能器优值的相关参量表达式,通过数值计算分析了该换能器的结构和材料参数对其特性的影响。研究结果表明,当两组压电陶瓷堆分别位于各自所在半波长换能器的位移节点,或者在压电陶瓷片数量确定情况下两组压电陶瓷堆的片数相同时,换能器均能得到最大的优值;在相当大的范围内增加压电陶瓷片的数量,换能器的优值稍有降低,但力因子迅速增大;金属块材料对换能器的优值影响甚微。可见双激励全波长换能器能在不明显降低换能器综合性能的情况下有效增加压电陶瓷的体积,因而可大幅提高换能器的功率容量和负载能力,更适用于大功率重负载的场合。
The double-excitation full-wavelength piezoelectric ceramic ultrasonic transducer cascaded by two half-wavelength sandwich piezoelectric ceramic transducers was studied, and the related parametric expression of the excellent value of the transducer was given. The influence of the structure and material parameters of the transducer on its characteristics was analyzed by numerical calculation. The results show that when the two piezoelectric ceramic stacks are respectively located at the displacement nodes of the half-wavelength transducer where they are located or when the number of the two piezoelectric ceramic stacks is the same when the number of the piezoelectric ceramic sheets is determined, Can get the maximum merit; in a considerable range to increase the number of piezoelectric ceramics, the transducer value slightly lower, but the force factor increases rapidly; metal block material on the excellent value of the transducer is very micro. It can be seen that double-excitation full-wavelength transducer can effectively increase the volume of piezoelectric ceramic without significantly reducing the overall performance of the transducer, thereby greatly improving the power capacity and load capacity of the transducer and is more suitable for high-power heavy-load The occasion