| Dielectric elastomer(DE)is an electro active polymer(EAPs),which has high energy density(1.5J/g),large dielectric constant and small elastic modulus,and does not depend on excitation frequency.It is very suitable for low frequency and large deformation applications.The energy harvesting device of the dielectric elastomer has a unique advantage in collecting wind energy,tidal energy,and human motion energy.In this paper,an energy harvesting system based on dielectric elastomer is designed.Firstly,the dielectric elastomer energy exchange element is simulated and analyzed with the COMSOL simulation software,and the constitutive model of the material is Neo-Hookean.The electric field and potential distribution of dielectric and its surrounding dielectric are analyzed.The results show that the electric field in the air field near the dielectric edge of the dielectric elastomer is high,but with the increase of distance,the intensity of the electric field in the air domain attenuates rapidly.When the bias voltage is small,the Maxwell stress tensor is very small and can be ignored.In addition,a steady state simulation solution is proposed for the constant charge cycle of energy collection of energy exchange elements.We got the result which suggests how the voltage,deformation and size of the dielectric elastomer effects the energy gain.Obviously,under the condition of constant bias voltage,The change rate of surface area has the greatest influence on the energy gain.The higher the bias voltage is,the more upwards the curve is.If the area change rate is constant,the influence of bias voltage on energy gain is approximately linear in the range of low voltage bias,but with the increase of bias voltage,the influence of the bias voltage on the energy gain is gradually increasing.The influence of the size of the energy exchange element on the energy collection is basically linear.According to the theoretical analysis results,the vibration micro energy harvesting system based on the dielectric elastomer has been designed.In this paper,silicon rubber is chosen as the production material of the film,and the 9mm*9mm*0.5mm film is made.The energy exchange unit bracket is made by 3D printer.According to the characteristics of power output based on energy exchange elements,we designed the data acquisition and uploading module based on Arduino and SIM900 A and the buck convertor based on XD308 H.Due to the fact that the current dielectric elastomer energy collector is short of actual operation data,in order to monitor the current running state of the system,a client/server architecture monitoring software based on Node.js is designed.The software system is efficient and Lightweight.At the end of this paper,the parts of the whole system are tested,and the parts of the system are running normally.The test results show that the influence of bias voltage and stretching degree on energy gain is similar to that of simulation.However,due to the energy loss,the output peak voltage is much smaller than the theoretical simulation results. |
