Influence of piezoceramic stack location on internal losses of Langevin transducer

Piezoceramic stack location is an important optimization design object of Langevin transducer, and many researches on this topic have been done but there are no consistent conclusions. In this paper, mechanical loss and dielectric loss of piezoceramic are mainly considered, and the relation between these two kinds of losses and the piezoceramic stack location is analyzed under the circumstances of constant output amplitude. Moreover, by introducing the load coefficient, the influence of the piezoceramic stack location on internal losses of Langevin transducer is discussed under different load conditions. The results show the piezoceramic stack corresponds to a best location for different loads, and at this time the internal losses of Langevin transducer is the smallest. The best location is gradually close to the displacement node of the transducer as the load increases. Thus it can be seen that the optimal design of piezoceramic stack location is closely related to the actual load, and the inconsistent conclusions about the problem by far stem from these analyses only to specific loads.