| Traditional oscillating water column wave energy generating device utilizes turbine generator to generate electricity.Working long hours in the wet environment at the seaside,the device has a short lifespan and is difficult to maintain,and also difficult to meet the needs of the wireless sensor network for persistent and stable power.This paper proposes a model based on dielectric elastomer material oscillatory water column wave energy generation device composed of wave energy acquisition part and power generation part.The device model power generation section uses a dielectric elastomer generator instead of traditional air turbine generator,because the dielectric elastomer material has the advantage of being directly coupled to the energy source.Therefore the device improves the life of the device on the basis of simplifying the traditional device.Based on potential flow theory,the dynamic model of the oscillating water column and the air chamber pressure was established to calculate the pressure of thatdevice.The pressure was driven by the dielectric elastomer film to verify the correctness of the theoretical calculation of the film deformation.In this paper,finite element analysis of the top structure of the air chamber,the simulation results are in good agreement with the calculation results.According to this theoretical analysis model,the parameters of the dielectric elastomer film are determined,solve the relationship between the amount of power generation and the amount of power generated in one cycle of the device as a function of parameters.According to the fluid velocity potential and dispersion equation,the pressure of each point is solved,and the pressure at the front wall of the air chamber is analyzed.Determine the equation of motion of the oscillating water column in the air chamber and the theoretical calculation formula of the pressure in the air chamber.The formula shows that the incident wave factor has a greater influence on the pressure at the opening of the air chamber and the pressure in the air chamber.Take C0=1.37e9Pa m2,take ?=1.4,water depth HB=8m.Assume the front wall of the device has a draft depth of 3m,air chamber width is 12m.Also,the influence of wave length and amplitude on the pressure in the air chamber is discussed,but also the size of the device and the water depth at the device placement have a great influence on the air chamber collection efficiency of the device.Similarly,C0=1.37e9Pa·m2,?=1.4,assume the period of the wave is 10s,frequency is 0.785,wave number 0.09686,amplitude is 1m.Discuss the influence of water depth at the placement of the device and the size of the air chamber on the pressure in the air chamber.The interaction model of air chamber pressure and dielectric elastomer film was established to analyze the deformation characteristics of the dielectric elastomer film.In this paper,the relationship between the film shape variables of dielectric elastomers and the parameters is studied and the theoretical analysis results are verified by finite element analysis.Finally,according to the parameters of the dielectric elastomer film with the maximum shape variable,By Comparing the energy output of three energy harvesting cycles of a constant electric field and a constant voltage,it is found that the highest output can be obtained under a constant electric field,established uniform deformation model of dielectric elastomer film,and calculated the energy generated by one cycle of the device according to the determined optimal parameters as 10.5kJ.The theoretical modeling of the dielectric elastomer thin film generating device is driven by the oscillating water column,and the air chamber can be converted into pressure in the air chamber,pressure drives dielectric elastomer film to produce energy.The numerical simulation wave can be converted to electric energy,also it provides a theoretical basis for the design of continuous power supply devices for islands and offshore platforms. |
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