Simulation Study Of Output Characteristics Of The Thermoacoustic Engine Based On Linear Servo System

Thermoacoustic power generation technology is a new type of technology for power generation, which can convert low grade heat sources, such as solar energy, industrial waste heat etc., into electrical energy. By applying thermoacoustic engine driving linear generator, thermoacoustic electricity generator converts heat source into acoustic power and electrical energy, step by step. Throughout the whole conversion process, there is not any moving mechanical part except for the linear generator. Though thermoacoustic power generation technology has a very bright application prospect, thermoelectric conversion efficiency is still very low for the reason that thermoacoustic engine does not match the linear generator. It is one of the effective ways of improving the efficiency to carry out a theoretical research on the matching performance between thermoacoustic engine and linear generator. While, in order to verify that the theory of matching performance is scientific and feasible, different kinds of thermoacoustic engines have to be produced, which will meet with significant technical difficulty and increased costs.To solve the problem, the thesis does significant research on the output characteristic of the thermoacoustic engine, and applies modern control theory to linear servo system to achieve the objective of simulating the output characteristic of the thermoacoustic engine. Specific researches as follows:Firstly, expound the necessity of simulating the thermoacoustic engine by liner servo system. On the base of mathematical modeling, the thesis analyzes the matching performance between thermoacoustic engine and linear generator, and does theoretical research on the frequency output characteristic and load matching characteristic of the thermoacoustic engine.Then, design plug-in repetitive controller and PDFF controller to improve the accuracy and swiftness of the linear servo system in the process of stimulation. Output characteristic of the thermoacoustic machine is simulated by the designed linear servo system. Simulation outcomes show that the designed linear servo system can simulate the frequency–displacement characteristic and load–displacement characteristic of different thermoacoustic engines.At last, build a linear servo system experiment platform with the core of DSP to verify the controller. Experiments show that the linear servo system based on plug-in repetitive controll can achieve the objective of simulating the output characteristic of the thermoacoustic engine and provide an experiment platform for the research on thermoacoustic power generation technology.