Research And Realization Of Three-dimensional Dynamic Exciting Force Testing Technology Of Rotating Shaft System

The dynamic exciting force generated by the interaction of pumps,fans and other rotating machinery with the medium during operation is the key inducement for the vibration and noise of the rotating shaft system.The traditional research method of dynamic load of rotating shaft system is mainly based on theoretical numerical simulation,and the experimental method is mainly based on the test of the vibration force of the stationary fixed support of the shaft system,which lacks the necessary means of dynamic load test.At the same time,most of the multidimensional force sensors used for dynamic testing only do static calibration instead of dynamic calibration.Therefore,this paper starts from the research of three-dimensional force sensor,researches the measurement technology of three-dimensional dynamic excitation force of rotating shaft system,and realizes the measurement of dynamic load of rotating shaft system.The types and characteristics of the existing multi-dimensional force sensors are analyzed,and a strain-type cross-beam three-dimensional force sensor that can be used in a narrow working environment is designed.Through simulation software,the sensor is analyzed for structural statics,and the structure improvement and parameter optimization of the existing cross beam sensor with poor Z-direction measurement accuracy and coupling characteristics are carried out,and the structural self-decoupling performance of the Z-direction test is realized and optimized at the same time.The placement of the strain gauges is verified,and the feasibility and rationality of the dynamic excitation force measurement are verified.The design and construction of the static calibration experimental device of the three-dimensional force sensor was carried out,and the accurate static calibration of the three-dimensional force sensor was realized.The static decoupling equation of the sensor is determined by coupling error modeling and least square fitting method,which improves the sensor’s comprehensive static measurement accuracy.The dynamic test performance of the three-dimensional force sensor is studied,the dynamic calibration experiment of the strain-type three-dimensional force sensor is explored,and the accurate dynamic performance test of the sensor designed in this paper is carried out through the negative step response experiment.According to the dynamic calibration experimental data,the ARX model based on system identification is modeled,and the accuracy of the three dimensions of the model is higher than 98%.Then the model signal is dynamically compensated,the negative step response overshoot of the three dimensions of the sensor is reduced from 70%～90% to 1%～3%,and the adjustment time is reduced from 13ms～19ms to less than 1ms,which improves the sensor.Dynamic test performance.An experimental platform for dynamic excitation force testing of the rotating shaft system was built.The amplitude and phase of the dynamic load were controllable by using standard weights and rolling bearing loading.The actual test capability of the sensor system and the feasibility of the experimental plan were carried out.verification.