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首页> 外文期刊>Mechanical systems and signal processing >A New Method For The Estimation Of The Instantaneous Speed Relative Fluctuation In A Vibration Signal Based On The Short Time Scale Transform
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A New Method For The Estimation Of The Instantaneous Speed Relative Fluctuation In A Vibration Signal Based On The Short Time Scale Transform

机译：基于短时标变换的振动信号瞬时速度相对波动估计新方法

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摘要

In this paper we propose an original method for the estimation of the instantaneou speed relative fluctuation (ISRF) in a vibration signal measured on a system submitted t relatively heavy load and speed fluctuations and without speed measurement available Our approach is based on the estimation of an instantaneous time-scaling factor along the vibration signal, related to the instantaneous relative speed gap from time t = 0. 1 extends a previous work related to the estimation of the relative speed gap between two stationary signals via the Scale transform. In a non-stationary situation the method is performed between segments of the signal, which we coin the short time scale transform In order to adjust the optimal length of the segments we propose an optimisatior scheme based on the Kurtosis maximisation of the amplitude spectrum of the angulai resampled signal using the estimated ISRF. Contrary to conventional methods based or the instantaneous frequency estimation of one spectral component, the proposec method for ISRF estimation does not depend on the choice of one particular component The algorithm is relatively simple to implement and has a reasonable computation cost However, it is not advised to use it in the case of very large speed variations such as during a speed-up. The method is then applied to the vibration measurements of two different planetary gearboxes used in the mining industry, first one with available speeo measurement for validation, and second one with advanced wear of the planetary stage and without speed information. In this latter case the estimated ISRF is used in order to establish a diagnosis of the system.
机译：在本文中，我们提出了一种估计振动信号的瞬时速度相对波动（ISRF）的原始方法，该系统在负载和速度波动较大且没有可用速度测量的系统上进行测量。沿振动信号的瞬时时间比例因子，与从时间t = 0开始的瞬时相对速度差距有关。1扩展了先前的工作，该工作与通过Scale变换估算两个固定信号之间的相对速度差距有关。在非平稳情况下，该方法在信号的各段之间执行，我们采用了短时标变换。为了调整段的最佳长度，我们提出了一种基于峰度最大化的峰度最大化的优化方案。使用估算的ISRF对安古拉进行了重新采样。与基于常规方法或一个频谱分量的瞬时频率估计相反，提议的ISRF估计方法不依赖于一个特定分量的选择。该算法实现起来相对简单，并且具有合理的计算成本，但是不建议这样做。在速度变化非常大的情况下（例如在加速过程中）使用它。然后将该方法应用于采矿业中使用的两个不同行星齿轮箱的振动测量，第一个具有可用的立体测量以进行验证，第二个具有行星齿轮架的高级磨损且没有速度信息。在后一种情况下，使用估计的ISRF来建立系统的诊断。

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