Research On Electromechanical Conversion Efficiency Of Dielectric Elastomer Generators

Dielectric elastomer generators(DEG) is a type of generator, which is composed of a new functional material. It is suitable for small scale and micro electromechanical systems and so on. In the course of practical research, because DEG is influenced by many factors,such as the dielectric elastomer material resistance loss, flexible electrode loss, mechanical loss, power generation cycle methods, reducing the electromechanical conversion efficiency.Based on the principle of mechanical and electrical conversion of DEG and basic power generation cycle method, the absolute energy collection, relative energy collection and conversion efficiency evaluation formula of three dimensions for evaluating the efficiency of power generation, and then expand the study on factors influencing efficiency, and recycling method of combinatorial optimization, nonlinear electromechanical conversion method was optimized. By energy calculation and analysis of the power cycle the energy harvesting and dielectric loss and mechanical loss, finding DEG electromechanical conversion efficiency and material DE resistance loss, flexible electrode loss, mechanical loss is directly related.According to the different characteristics of the three cycle modes, using the combination of constant electric field and constant charge, the switching point of the combined cycle is analyzed to realize the optimal energy conversion cycle and reduce the energy loss. Establishment of the DEG model, using Matlab / Simulink software simulation results show that: tensile force and capacitance with the tensile ratio was positively linearly proportional to the change, the effect of mechanical and electrical conversion efficiency;constant charge recycling can achieve the minimum loss, choosing constant cyclic electric field can achieve maximum absolute collecting energy; constant charge and constant electric field cycling combination selection, with ?t(t3,t'3)/T=0.15 cyclic switching point, and compared to constant electric field cycle,the under the power generation efficiency of combinative one improve nearly 2 times.Research on traditional electromechanical conversion method and nonlinear electromechanical conversion method of DEG, establishing the theoretical model and the change trend of MATLAB / Simulink software simulation of DEG at both ends of the output voltage and power, and calculating the conversion of electrical energy. Simulation results show that: under the same conditions, compared with the traditional electromechanical conversion methods, the use of nonlinear electromechanical conversion method, the amplitude of DEG at both ends of the voltage significantly increased, power and energy can be increased by 3.41 times.To build a DEG power generation experiment platform, analyze the effect of DE material resistance value and cyclic mode on electromechanical conversion efficiency. Theexperimental results show that the flexible electroder esistance of DEG by toner mesh,quantity, and silica gel, silicone oil ratio effect. Toner mesh increases, the resistance value decreases at the beginning and then increases, increase the number of toner, the resistance value becomes smaller and the electrode dry, resistance value is small, dry degree of electrode need determination is made according to the actual applications. Under the same conditions,the theoretical calculation of the absolute collection energy for constant cyclic electric field WE> constant charge recycling WQ> constant voltage cycle WV. And due to the loss factor exists in the actual environment, and lead to a cycle of the actual energy value is lower than the theoretical value. For electromechanical conversion efficiency relationship, constangt charge cycle ?Q> combination cycle ?QE> constant electric field ?E, the experimental and simulation results consistent.