Data acquisition and processing method for high-speed dynamic balancing of rotors

For the presence of characteristics including high speed, excessive vibration and phase fluctuations in the process of rotor high-speed dynamic balancing, a method of data acquisition and processing for high-speed dynamic balancing was proposed. Based on multithreading technology, the rotational speed signal was accurately measured and vibration signals were synchronously collected. Both the transient state and steady state could be quickly switched to each other according to the variation?of rotational speed, which can reduce switching time, facilitate operation and improve testing efficiency. Using the pulse signal of rotational speed as a benchmark, vibration signals were divided into several integral periods. Interpolation was conducted towards the sampling points per period and balance records were averaged multiple times in order to solve the unstable problems of amplitude and phase when speed fluctuated. A rotor model for experiments is established, and dynamic characteristics of the rotor are calculated and tested. The results suggest that the relative error between calculated and measured values of the first critical speed is less than 1%, and the relative error of unbalance response does not exceed 10%. Thus the simulating calculation is consistent with the testing outcome. In addition, the algorithms of phase processing improve the accuracy and stability of phase measurement. The data acquisition and processing system has practical significance of engineering application for rotor dynamic balancing.