Pneumatic Position Monitoring Method And Experimental Study Based On Triboelectric Principle

With the rapid development of the automation industry,sensing technology is also constantly improving and innovating.Pneumatic technology is a very important means to realize mechanical automation.Cylinder is the most important actuator in pneumatic system,so it is necessary to monitor the running state of cylinder.Effective cylinder monitoring can improve the efficiency and flexibility of the pneumatic system,and help to diagnose and prevent cylinder failures,thereby reducing maintenance costs and downtime.Especially in booming industrial informatization,promoting the development of cylinder positioning technology can help the realization of intelligent pneumatic technology.Therefore,based on coupling the principle of friction electrification and electrostatic induction,a triboelectric cylinder position sensor is developed to monitor the running state of the cylinder in real time.According to the characteristics of its electrical signal,a signal conditioning circuit is designed and a hardware module is developed.Combined with the practical application requirements of the pneumatic system,an integrated pneumatic position monitoring system is built.Firstly,the basic principle of triboelectric nanogenerator is introduced,and the physical mechanism of generating electrical signals is explained.The working principle of the independent layer triboelectric nanogenerator is described and the basic physical model is constructed,and the characteristics of its output electrical signal are explained.Combined with the basic dynamic theory and the physical model of the freestanding triboelectric nanogenerator,the influence of the operating state of the cylinder on the output performance is analyzed,and the output law of the electrical signal is further explained.In addition,the structural design and simulation analysis of the triboelectric cylinder position sensor are carried out.According to the actual application requirements of the pneumatic system,the structural parameters of the sensor are determined and the prototype is processed and assembled.The finite element analysis simulation software is used to analyze the potential distribution of the sensing unit at different positions.The rationality of the structural design and size parameters of the sensing unit is verified,which provides support for the subsequent experimental test and clarifies the detection principle of the sensor.The experimental test system is built to study the basic output performance,load characteristics and durability of the triboelectric cylinder position sensor under different test conditions,and the basic characteristics of the sensor are analyzed and verified.Furthermore,the displacement measurement performance and velocity measurement performance of the sensor are analyzed,and the accuracy of the displacement measurement is evaluated by a commercial grating ruler.The results show that the sensor is accurate and reliable.Finally,according to the signal characteristics of the triboelectric sensor,a signal conditioning circuit with impedance matching and analog-to-digital conversion functions is designed and the circuit simulation analysis and functional testing are carried out.An integrated hardware module with real-time wireless transmission function is developed.Combined with the application requirements of the pneumatic system,an integrated pneumatic position monitoring system is built to realize the real-time monitoring of the cylinder running state.In this study,a new method for detecting the position of cylinder piston is proposed.The performance of triboelectric cylinder position sensor is systematically studied by basic theoretical analysis,simulation verification and experimental research,which further promotes the application of triboelectric sensor in pneumatic industry and automation industry.Future research work includes improving the life of the triboelectric cylinder position sensor and packaging the integrated pneumatic position monitoring system to adapt to different usage scenarios.