Based On Giant Magnetostrictive Membrane Voice Sensor Used In Detecting Fault Of Engine

Our country has rare earth reserves about 65000kt,which is recognized the world's largest rare earth storage state based on 23%of the total storage capacity around the world,with the rapid development of the rare earth industry,our country undertakes the 90%the world's rare earth supply.Rare earth has lots of merits,often used in military industry machinery,petrochemical industry,glass ceramic,microcomputer electron and so on.As a branch of rare earth material,with the development of the rare earth industry,many well-known colleges,universities,research institutes and high-tech business research on giant magnetostrictive material and manufacturing applications.Giant magnetostrictive material(GMM)has lots of advantages of high curie temperature,strong power density and fast response speed,so widely used in the micro-pump,brake and design of sensors.This article is based on Villari effect,aimed at application requirements of 1.6L electronic controal fuel oil injection engine to make structural improvement and come up with a new construction of voice sensor based on GMM.Designed the giant magnetostrictive membrane voice sensor could solve the question of complicated and overloaded fault inspection ways.Firstly,made systematical description of performance requirements of the giant magnetostrictive membrane voice sensors and confirmed the working process,then theoretic analysis is conducted based on the Villari effect,which verified feasibility of designing sensor based on GMM by theory.Secondly,uesd COMSOL Multiphysics conducted many physical field coupling analysis because of the giant magnetostrictive membrane voice sensor refer to many physical fields,then verified the rationality of giant magnetostrictive membrane by simulation and analyzed the four layers systematicly:respectively sound wave signal is transformed into pressure which applied on the giant magnetostrictive membrane,pressure make the deformation of membrane,deformation makes the membrane that internal magnetic domain change to generate nduced magnetic field,produced induced current in induced coil.Then made giant magnetostrictive membrane simulation curve to describe strain due to the human ear perception of voice frequency range from 20 to 20000 Hz.Finally,designed a giant magnetostrictive membrane voice sensors to detect malfunction of the engine aim at the parameters of 1.6L electronic-controlled fuel injection engine.Used finite element analysis of the designed structure statics analysis,modal analysis and random vibration analysis to verify the sensor in the high pressure and strong vibration conditions could work normally.The analytic results show that the designed sensor can satisfy the conditions of use.