基于FPGA的转子振动信号整周期等相位采样控制方法

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

为了提高频谱分析的精度,要求对振动信号进行整周期等相位采样。因此,提出了一种基于FPGA的整周期等相位的采样控制方法。该方法将键相倍频信号作为A/D转换的触发信号,键相倍频电路利用FPGA芯片内部逻辑器件实现,电路中加入了周期线性插值预估模块,以提高键相倍频的精度。研究结果表明:该方法设计的键相倍频电路能实现预定功能,且具有集成度高、倍频范围广等优点,可以广泛应用于转子振动信号的整周期等相位采样控制。

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.