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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part C. Journal of mechanical engineering science >Extraction of the instantaneous speed fluctuation based on normal time-frequency transform for hydraulic system
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Extraction of the instantaneous speed fluctuation based on normal time-frequency transform for hydraulic system

机译：基于液压系统正常时频变换的瞬时速度波动提取

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摘要

The instantaneous speed fluctuation is the most direct manifestation of system dynamics behavior, which reflects the running status of the hydraulic system. It is crucial to mine the information contained in instantaneous speed fluctuation and extract them accurately. This paper first introduces the instantaneous speed measurement of the hydraulic system, and it is found that the instantaneous speed signal with an equal angle sampling is a harmonic signal. Next, causes of instantaneous speed fluctuation for hydraulic system are derived by kinetics analysis, where the working mechanism of the axial piston motor and the inevitable misalignment of the shafts are concerned. Then the normal time-frequency transform and the inaction method are introduced, and its high accuracy for harmonic signal extraction in additive noise is verified by comparing with the wavelet packet method with simulation analysis. Finally, the validity of the cause analysis and the extraction method are verified by experiments under different working conditions. The experimental results show that the frequencies of the instantaneous speed fluctuation components can be displayed automatically by normal time-frequency transform spectrum and their waveforms can be extracted accurately by the inaction method. It is also found that the change of the rotating speed and torque can be presented by the variety of the magnitude of the instantaneous speed fluctuation components at the 7th order and the 14th order, respectively. Cause analysis and accurate extraction of the instantaneous speed fluctuation will provide theoretical support and data support for the performance evaluation, state monitoring, and fault diagnosis of the hydraulic system.
机译：瞬时速度波动是系统动力学行为最直接的表现，这反映了液压系统的运行状态。对瞬时速度波动中包含的信息来说至关重要，并准确提取它们。本文首先介绍了液压系统的瞬时速度测量，并且发现具有相等角度采样的瞬时速度信号是谐波信号。接下来，通过动力学分析导出液压系统瞬时速度波动的原因，其中轴向活塞电动机的工作机构和轴的不可避免的未对准。然后介绍了正常的时频变换和无所作用方法，并通过与模拟分析的小波分组方法进行比较来验证加性噪声中的谐波信号提取的高精度。最后，通过在不同工作条件下的实验验证了原因分析和提取方法的有效性。实验结果表明，瞬时速度波动分量的频率可以通过正常的时频变换谱自动显示，并且可以通过无所作的方法精确提取它们的波形。还发现，旋转速度和扭矩的变化可以分别在第7阶和第14阶处的瞬时速度波动分量的各种幅度呈现。原因分析和准确提取瞬时速度波动将为液压系统的性能评估，状态监测和故障诊断提供理论支持和数据支持。

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