Micro-thruster Optimization Design Based On Piezoelectric Transformer

Since conventional micro-thrusters have rushed low, heavy, complex structure and other reasons, it is difficult to meet the development needs of nano-satellites. Based on MEMS technology of micro-propulsion system, the main research is to design optimized the micro-thruster structure on the basis of piezoelectric transformer in this paper. Because of the piezoelectric transformer with small size, light weight, boost ratio, long life, non-flammable, non-electromagnetic pollution, etc.. For these advantages, optimization design for the structure of micro-thrusters can realize the control of propulsion accurately, system reliability improved, and then it can develop into a nano-satellite propulsion system with high efficiency, high precision, low power consumption, compact structure. The main contents are as follows:Firstly, build micro-thruster theoretical model based on piezoelectric transformer. A disc-shaped and monolayer micro-thruster can be built with the material of LiNbO3. Then building mathematical model, this include that the mathematical formula is derived for some core parameters of micro thruster, such as step-up ratio, power, frequency, etc.Secondly in-depth analysis was carried out on the micro-thruster based on the finite element simulation of COMSOL. Set up micro-thrusters finite element model and carry on the simulation analysis. Then in combination with the results of MATLAB simulation analysis, the influence of various parameters on the micro-thruster can be understood deeply in the pieces of step-up ratio, power and load resistance, etc. And then optimize the micro-thruster parameter and design its structural.Thirdly, factory customize different sizes of piezoelectric ceramics, which can process into different input size and different output size of the micro-thruster. Then build the test platform for micro-thruster performance test. It can verify theoretical analysis and simulation results of previous chapter, and test the different micro-thruster performance, such as the output voltage, pressure ratio, efficiency, load resistance parameters. In the end compare the results and conclude the optimal micro-thrusters.