| With the fast development of science and technology,due to the large amount of energy used,energy shortage and environmental pollution have become increasingly serious.At present,energy conservation and emission reduction is a hot issue in improving the environment conditions.So far,most of the noise control technologies can only meet the requirements of emission reduction.Therefore,the use of energy conversion technology is a more feasible way to turn the noise into treasure,and it has a great significance for improving the environment conditions and emission reduction.With the rapid development of circuit and energy storage technology,piezoelectric material,noise power generation technology can play an important role in noise pollution control.Noise power generation technology has the advantages of environmental protection,convenience,safety,and has become a research focus in the field of noise pollution control.The relevant literature on the noise power generation technology at home and abroad is investigated by the dissertation.Due to certain confining factors,noise power generation device designed by researchers collects noise energy inefficiently in the environment.In order to improve energy collection efficiency,noise energy collected by the noise power generation device is designed.The mathematical model and MATLAB simulation analysis of the reflector,the mathematical model and finite element analysis of the piezoelectric ceramics,structural design,circuit design and experimental test are focused on the noise power generation device.In this paper,the main contents are mainly included:(1)Based on Kirchhoff diffraction integral and the theory of acoustic focus,a transient analytical solution for the reflected pressure wave is solved.Then the DR algorithm proposed by the paper is introduced to calculate the convolutional Kirchhoff formula,and a 3D numerical solution of the reflected pressure wave is obtained consequently.The theoretical basis is provided for the analysis of the acoustic focus effect on the reflector.Finally,the influence of depth-to-focal-distance ratio of a parabolic reflector on the acoustic focus effect is analyzed,and the structure of the reflector is designed.(2)Based on the theory of piezoelectric generation,the characteristics of piezoelectric ceramics are studied.The types and performance parameters of piezoelectric material are analyzed.For noise power generation device provides the basis for performance analysis.The mathematical model of piezoelectric ceramics is constructed,and its vibration characteristics are analyzed,differential equations are established,and it is laid the foundation for finite element analysis of piezoelectric ceramics in the next step.(3)The finite element software ANSYS is used for simulation analysis of piezoelectric ceramics,the influence of piezoelectric ceramics structural parameters on its output voltage and natural frequency is analyzed.Then the noise frequency of noise power generation device applied in the environment(road traffic)is analyzed.Based on the above analysis results,the structure and natural frequency design of the noise power generation device are finally carried out.(4)In order to evaluate the power generation capacity of the noise power generation device,the calculation formulas for its output voltage and output power are derived,and the design of energy storage circuit and charging control circuit is completed.(5)The experimental platform for power generation performance of the noise power generation device is built,then the power generation performance of the device is tested.The experimental results show the output power of the noise power generation device with reflector is significantly higher than the output power of the device without reflector,and the reflector could converge efficiently on the noise energy in the environment. |
