FPGAbased control method for rotor vibration signal's full cycle and equal phase sampling

LIANG Wenjun1,2, YANG Shixi1,2, WEI Yimin1,2
（1. Institute of Modern Manufacturing Engineering, Zhejiang University, Hangzhou 310027, China;
2. State Key Laboratory of Liquid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China）

Abstract: In order to improve the accuracy of spectrum analysis, its better to sample the vibration signals in the way of full cycle and equal phase. So an FPGAbased control method to realize the sampling was proposed. The key phase multifrequency signal was used as the trigger signal of A/D conversion. The key phase multifrequency circuit was realized in the FPGA chip using inner logic cells, a module for predicting the period of rotor using linear interpolation algorithm was added to the circuit, to improve the circuits accuracy. According to the result of research: the key phase multifrequency circuit of this design could achieve the expected function, and it has the advantages of high integration and wide multifrequency ranges and so on, which can be widely appllied to the field of sampling control of rotor vibration signal in the way of full cycle and equal phase.
Key words: control technology; condition monitoring; full cycle; multifrequency; linear interpolation algorithm