Research On Optimal Design Of Actuating Performance Based On Annular Dielectric Elastomer Interdigital Transducer

Interdigital transducer (IDT), it is widely used in structural health monitoring of large-scale projects, due to its excellent designability. However, for the implementation of structural health monitoring of large-scale complex projects, the existing conventional piezoelectric transducers have some shortcomings, such as poor flexibility, poor mechanical and electrical performance, while the flexible transducer based on polyvinylidene fluoride (PVDF) is difficult to achieve efficient actuating performance. Based on the multi-physical coupling theory, the electrode width, electrode spacing, substrate size and other parameters of IDT was optimized by piezoelectric module. The orientation and the interval of IDT was determined, so as to realize the excellent electromechanical conversion efficiency. Firstly, the annular Dielectric Elastomer Interdigital Transducer (DE-IDT) model with different electrode width, electrode spacing, substrate thickness and substrate size is constructed. Under the piezoelectric plate, the strain of different electrode width, electrode spacing, substrate thickness and substrate size is analyzed. According to the strain, the piezoelectric effect is judged, and the optimal size of DE-IDT is obtained on the basis. The azimuth and distance of DE-IDT are simulated to obtain the optimal actuating distance. The circular DE-IDT has good omnidirectional characteristics and the optimal electrode width, electrode spacing, substrate thickness and substrate size are determined.