Model And Simulation Analysis Of Self-Powered System For Bus Application

The rapid development of science and technology and economic globalization have made people's living standards continue to rise.At the same time,people's pursuit of quality of life is constantly increasing,and environmental awareness is becoming more and more intense.More and more people choose public transportation to travel in this green way.As China's investment in building urban rail transit increases,the demand for rail transit vehicles also increases year by year.The number of urban public transport operations in China will also increase.Constantly maintain the momentum of sustained growth.It is estimated that by 2021,the number of city bus operations in China will approach 560,000.Such a huge amount of public transportation will certainly consume a large amount of non-renewable energy.In order to solve this problem,it is very necessary to study a miniature self-powered power generation system.In recent years,due to advances in processing technology,micro-electro-mechanical systems have been correspondingly developed,making it possible for miniature self-powered power generation systems.At present,the research on power generation methods of self-powered systems can be divided into three aspects: electromagnetic power generation,piezoelectric power generation,and electrostatic power generation.Due to the limitations of microfabrication technology,electrostatic generators are often the first choice for miniature self-powered systems.This paper mainly studies the micro-vibration electret power generation system.The influence of the edge effect on the output power is mainly studied from three parts.The first part focuses on the two-dimensional mapping of the miniature vibrating electret generator model.First,the existing kinetic energy collection device was improved,and a three-dimensional model of a miniature vibration electret generator was established.Because it is necessary to study the effect of the edge effect on the output power,it is necessary to turn the three-dimensional model into a convenient two-dimensional model.The three-dimensional model needs to be mapped using the complex function Schwartz-Cristopher mapping,and the three-dimensional power generation model is transformed into a two-dimensional power generation model.The second part mainly studies the electric energy conversion model of micro-vibration electret power generation device.First,the two-dimensional model studied in the first part needs to be calculated.Because the 2D model cannot be represented by an elementary function,the 2D model needs to be transformed.In this part,the first type elliptic integral and the second type elliptic integral are used to convert the two-dimensional model,and the converted two-dimensional model is calculated.Finally,the micro-vibration electret generator is considered to consider the edge effect.The mathematical model below.The third part is mainly to simulate the output power model of the micro-vibration electret generator proposed in the second part,and then simulate the output power without consideration of the edge effect,compare and analyze the two,analyze and study.Ignore the critical point of the edge effect.In the process of research,the simulation environment was first set up,namely the software Ansoft Maxwell and MATLAB.Secondly,the test parameters were selected and set,and the results were simulated and analyzed according to the experimental model and parameter settings.From the comparison of output power and the analysis of the resulting errors,we finally obtained the condition that the edge effect can be ignored,that is,the ratio of h/g is greater than 28.724.