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首页> 外文会议>First international symposium on instrumentation science and technology(ISIST'99) >An accurate method to obtain magnitude and phase of rotor unbalance signal
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An accurate method to obtain magnitude and phase of rotor unbalance signal

机译：一种获取转子不平衡信号幅值和相位的精确方法

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摘要

It is very improtant to balance rotor in-situ for gas turbines and power engines. Rotor balancing is usually carried out through vibration phase and magnitude of rotors. Normally vibration phase and magnitude are obtained from FFT of the vibration picked at bearing supports. Because leakage, aliasing and grid leaking exist in FFT, the precision of phase and magnitude especially vibration phase is not high enough which will decline balancing efectiveness. This paper presents a practical method to obtain vibration phase and magnitude accurately in-situ. By FFT theory, if sampling by an integer factor via rotary speed while taking balance, leakage, aliasing and grid leak will not exist in FFT calculation and accurate phase and magnitude can be obtained. Tracking sampling via rotor rotary speed satisfies the demand of sampling by an integer factor. To generate tracking pulses, PLL )Phase Lock Loop) technique is used to track the change of rotary speed. If rotary speed dose not change very swiftly, the precision of phase and magnitude could be quite high inspite of rotary speed waving. Beside theoretical analysis, experimental results and comparison between free sampling and tracking sampling are also given.
机译：平衡燃气涡轮机和动力发动机的转子非常重要。转子平衡通常通过转子的振动相位和大小来实现。通常，振动相位和幅度是从轴承支座上选取的振动的FFT获得的。由于FFT中存在泄漏，混叠和网格泄漏，因此相位和幅度（尤其是振动相位）的精度不够高，这会降低平衡效果。本文提出了一种实用的方法来精确地原位获得振动相位和幅度。根据FFT理论，如果在获得平衡的同时通过转速以整数倍进行采样，则FFT计算中将不存在泄漏，混叠和电网泄漏，并且可以获得准确的相位和幅度。通过转子转速跟踪采样可以满足整数倍采样的需求。为了产生跟踪脉冲，使用PLL（锁相环）技术跟踪旋转速度的变化。如果转速变化不快，尽管有转速波动，但相位和幅度的精度可能会很高。除了理论分析，还给出了实验结果以及自由采样和跟踪采样之间的比较。

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