| As Made in China 2025 has clearly stated China's development direction of intellectualized and wireless manufacturing industry,a large number of wireless sensors have been gradually introduced into the pneumatic system and replaced ordinary sensors.However,wireless sensors applied in pneumatic system is mainly powered by the secondary battery.The frequent replacement of a quantity of secondary batteries causes serious problems such as environmental pollution and wastage of human resources.Based on the background mentioned above,this thesis proposes a piezoelectric energy converter applied in pneumatic system.This converter is designed to be installed on both sides of the air cylinder inlet and exhaust pipe to convert the gas pressure energy in the pneumatic system into electrical energy which will be stored in the secondary battery.In this way,the converter can effectively prolong the service life of the secondary battery and make it continuously power the sensors.Firstly,the mathematical model of piezoelectric bimorph under gas pressure is established.Through theoretical analysis and comparison,the constraint form of piezoelectric structure in the converter chamber is determined,and the optimal shape and arrangement of piezoelectric plates are obtained.The main parameters influencing power output and their influencing laws are proposed,which provides guidance for performance analysis through simulation.Secondly,on the basis of theoretical analysis and combined with the practical application environment of the converter,the structure is improved to solve the sealing problem.As for the irregular shape,the complex structure,which is inconvenient to be analyzed theoretically by formula,needs to be further studied by simulation.In this paper,the key parameters of substrate,piezoelectric plate,diaphragm are analyzed and improved by simulation,and the influence law of relevant parameters on power generation performance is obtained.Combining the theoretical part with the simulation part,the method of selecting substrate parameters such as thickness and material under different working conditions is proposed.This paper compares the output power of the improved sector piezoelectric structure with that of the circular piezoelectric structure,and verified the power generation performance of the improved structure.In order to avoid the influence of piezoelectric energy converter on the normal operation of pneumatic system,the influence of piezoelectric energy converter and related pipes on pneumatic system is analyzed.Firstly,the maximum number of converter chamber on both sides of the cylinder are determined by air consumption index.Further,the simulation model of pneumatic system was built.According to the actual situation,three typical working conditions of handling,lifting and clamping were selected for research.Then,the working conditions of the system under the three working conditions were analyzed.Finally,the influence of piezoelectric energy converter and related pipes on the response speed of pneumatic system under three typical working conditions is explored,and it is uniformly converted into the increase of load rate for comparison. |
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