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An accurate instantaneous angular speed estimation method based on a dual detector setup

机译：基于双探测器设置的精确瞬时角速度估计方法

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摘要

Instantaneous angular speed (IAS), or 'true IAS', is an inherent signature directly related to the mechanical dynamics of rotor systems and has been employed extensively in different rotating machines. Due to various uncertainties, such as manufacturing error or the inaccurate installation of encoders, the acquired IAS signals often contains significant contents of 'false IAS' which can mask the small variations of IAS, lead to low accuracy and consequently affect the understanding of the dynamic behaviour of a rotor system. This study proposes a dual detector method to minimize the influence of encoder errors and hence obtain more accurate IAS estimation. Through theoretical study, it is proved that the false IAS induced by encoder errors from the two detectors have the same amplitudes but with a phase difference, whereas the true IAS components from the two detectors are identical. On this basis, an algorithm is developed firstly to acquire the encoder errors through a phase alignment operation and then estimate the true IAS after removing the estimated encoder errors. The proposed method is evaluated by both numerical simulations and experimental studies. The results show that the proposed method can more significantly suppress the encoder errors associated with encoder eccentricities in comparison with conventional reference methods, thereby yielding an accurate true IAS from the measurement. The proposed method can be particularly effective when the encoder has very low accuracy, allowing a more cost-effective IAS monitoring system to be achieved.
机译：瞬时角速度（IAS）或“真实IAS”是与转子系统的机械动力学直接相关的固有特征，已广泛用于不同的旋转机械中。由于各种不确定性，例如制造错误或编码器安装不正确，所获取的IAS信号通常包含大量“假IAS”内容，这些内容可能掩盖IAS的细微变化，导致精度较低，从而影响对动态特性的理解。转子系统的行为。这项研究提出了一种双检测器方法，以最小化编码器错误的影响，从而获得更准确的IAS估计。通过理论研究，证明了两个探测器的编码器误差引起的虚假IAS具有相同的幅度，但具有相位差，而两个探测器的真实IAS分量相同。在此基础上，首先开发了一种算法，该算法通过相位对准操作获取编码器误差，然后在去除估计的编码器误差之后估计真实的IAS。通过数值模拟和实验研究对提出的方法进行了评估。结果表明，与常规参考方法相比，该方法可以更有效地抑制与编码器偏心率相关的编码器误差，从而从测量中得出准确的真实IAS。当编码器具有非常低的精度时，所提出的方法可能特别有效，从而可以实现更具成本效益的IAS监视系统。

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