The Structure Design And Experimental Analysis For Piezoelectric Electro-pneumatic Convertor

Piezoelectric electro-pneumatic converter is used to accomplish the conversion between the electrical signal and the pneumatic signal. It is an indispensable signal-converting instrument in an automated system. There are three stages of it, which are the machinery type, electron type and intellectual type, while the electricization and intelligence are becoming the trend of it.The subject has finished the performance optimization of piezoelectric electro-pneumatic convenor, expounded the implementation method, parameters collocation and the key technology for the convertor.I/P convertor unit is the kernel of the piezoelectric electro-pneumatic convertor. Here it is the piezoelectric compound disk. The request to it is reacting sensitively, performing steadily. On the basis of the design of the convertor, the displacement model of the it has been derived out according to the energy method in the little flexibility bending of the thin shell and the vibration method to the piezoelectric vibrator. And also the main factors for the compound disk bending displacement have been got. Studied through the experiments, the exactness of the piezo-bimorph bending displacement model has been successfully proved.Through the orthogonal experiment method, the collocation of the three main parameters (the piezoelectric ceramic's diameter, thickness and the copper electrode's thickness) of piezoelectric compound disk is got. Also, the driving voltage has been reduced greatly. Many performance parameters of the convertor have been improved. In the mean time, the experiment method and the implementation method have been optimized. The relationships of the air p'ressure-voltage and displacement- voltage have been received both in theory and in experiment.On the basis of the optimization of the static parameters, the dynamic performance of converter have has also been optimized. According to the ANSYS finite element analysis and experiment, the influencing tendency of the three main factors has been got, along with the best parameters collocation.By trading off the static and the dynamic characteristics synthetically, the best parameters collocation has been gained. It has improved the performance of the piezoelectric electro-pneumatic convertor greatly, and laid a solid foundation for the future experiment and production.