Dynamic Simulation And Optimization Design Of Cylinder Type Force Measuring Sensor

The pump is widely used in various industries of modern society, and it is one of themost commonly used mechanical device. Its performance often play a decisive role. Pumpshaft is the key to judge the overall performance of pump performance, the axial force andradial force are the main factors influencing the spindle performance. For real-timemonitoring of the axial force and radial force, can be developed for the pump impeller andthe force balance device to provide accurate parameters. It can provide a reliable basis forevaluation of the water pump working status, so as to effectively improve the overallperformance of pump. Therefore, the research on accurate measurement of the axial forceand the radial force is extremely necessary, and has great realistic meaning and academicvalue.This paper introduces the mainly causes of pump axial force and radial force, and thedevelopment status, purpose and significance of the test. According to the pump shaftstructure and the characteristics of force, based on the principle of force transducer design acylinder elastic element. The elastic element is fixed between the pump shaft, and the elasticelement rotates together with the water pump when the water pump runs, so as to obtain theactual stress condition of pump shaft. The simulation model of the cylinder elastic element isestablished based on ANSYS finite element simulation software. When static simulationapplying external force to imitate the pump working status, establish a value path to extractthe axial strain, radial strain and so on, and provide a theoretical basis and reference for thesticking position of strain gauge. The four-arm full bridge connection is determined whenmeasure the axial force and the radial force with no mutual interference. Considering theelastic element driven in ratation motor, static simulation can not completely simulate thedynamic situation. Therefore, in order to more realistically simulate the dynamicperformance of the mechanism, the dynamic simulation is carried on by using modalanalysis method to get the natural frequency of the elastic element. The speed conditions areadded to dynamic simulation, the results were compared with the strain value of staticsimulation. Multiple groups of elastic element data are compared to optimize the design ofthe geometrical structure parameters. With comprehensive displacement as the mainrestriction index, try to improve the sensitivity and natural frequency. The inner diameter thickness and the change of length are adjusted, and compared from many aspects finally tofind the optimal design of the structure. The design make the force transducer with optimalperformance, and the results of the analysis will provide the basis for design andmanufacture of elastic element.The strain gauges paste on the elastic element according to the specified location,pressure is applied to component with different value. The strain gauge is used to measurethe strain value which output from1/4bridge, and compared with the simulation results. Theleast square method is used to the actual measured value for a straight line fitting processing.The lines have good linearity and analyze the causes of error.