| As human culture and technology have progressed,environmental challenges have become increasingly serious,and people are increasingly aware of the importance of reducing carbon emissions for long-term development.Traditional electromagnetic generators have a high energy collection efficiency when collecting high-frequency mechanical energy,but the efficiency of collecting low-frequency mechanical energy,such as breeze,wave,human and animal kinetic energy,which is abundant in the environment,needs to be improved.The dielectric elastomer generator is lightweight,inexpensive,and easy to construct,with natural benefits in collecting low-frequency mechanical energy.The external high voltage power supply and its significant distortion determine the output performance of classic dielectric elastomer generators.However,due to the considerable energy loss in applying bias voltage and decreasing voltage through transformer,the application of dielectric elastomer generator is restricted by the amount of transformer equipment.Self-priming circuits are being used in current research to tackle this problem.Although the current research-based self-priming circuit can simplify the structure of a dielectric elastomer generator and enhance energy collection efficiency to some level,it requires numerous mechanical cycles to produce a single high voltage direct current.Furthermore,when dielectric elastomer membranes suffer severe deformation changes,they are prone to micro-cracks in their interior,reducing their lifetime.Under the situation of large deformation,this phenomena immediately stops the dielectric elastomer generator from operating continuously.If the dielectric elastomer film is reduced in deformation,the resulting electrical energy will be greatly reduced,and even the voltage of the film can not be increased through multiple mechanical cycles by driving the self-priming circuit.The mechanism of energy collecting is examined in depth in this thesis,and the circuit layout of the dielectric elastomer generator is improved to obtain a dielectric elastomer generator with high output performance and high stability.The maximum amount of transferred charge of DEG is 15.86 m C/m~2per cycle,the energy density is as high as120.59 m J/g,and it can maintain this ability for at least 105 days.A forest fire alarm module for dielectric elastomer generator power supply is designed to provide examples for subsequent applications.The main research contents are as follows:1.Reduce the form variable of the de film to maximize DEG durability,compare the features of multi-stage self bias circuits,and choose the dielectric elastomer generator self bias circuit order that is best for small shape variable deg.This article chooses the second-order self bias circuit,which can adapt to a wider range of applications,based on the voltage rise concept and self bias circuit experiments.2.Improve the system output power by optimizing the structure of the second-order self-priming circuit.The merits and disadvantages of second-order self-priming circuit models with various capacitance configurations are investigated.The electrical performance of dielectric elastomer generators with varying capacitance ratios under the same dielectric elastomer film deformation is compared to validate the second-order self-offset circuit energy output model.The effect of deformation of a dielectric elastomer membrane on power generation is also investigated.3.The improved dielectric elastomer generator is put through a realistic durability test to ensure that it can be used.Controlling the dielectric elastomer’s form change and establishing a trade-off between power generation and durability optimizes the structure of the dielectric elastomer generator and its energy collection circuit.The system’s stability and energy collecting trials are carried out to ensure that it can be used in a practical setting.Finally,a wireless sensor network application example for forest fire protection is provided to support distributed sensors for passivity. |
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