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离散全矢谱校正方法及工程应用研究
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摘要
全矢谱技术是大型旋转设备故障诊断分析领域发展起来的一项新技术,它提高了设备诊断的准确性和工程实用性。传统的单通道振动信号分析方法已经不能满足工程实际中故障特征提取和故障分析要求,全矢谱充分利用双通道同源信息融合技术,快速、稳健、准确地获得振动信号所包含的全部有用信息。
     频谱校正的意义是提高频谱分析的精度。针对现有频谱校正技术只针对单源信号和同源的各单通道信号的频谱进行校正的研究现状,提出针对双通道融合矢量信号的全矢谱进行校正的方法。详细介绍内插法、能量重心法、FFT+FT法和相位差校正法的原理、方法及实现过程。分析和比较信号在三种不同窗函数条件下的内插法和三种不同相位差法的频谱校正结果。提出融合矢量信号的全矢谱和汉宁窗的内插法、连续等长的两段信号的相位差法相结合的校正法。
     研究并实现了全矢谱和汉宁窗的内插法、连续等长的两段信号的相位差法相结合的校正法。两种方法的原理都是将针对单通道传统FFT分析方法的校正理论应用到全矢谱中,精确求得非同步整周期采集的双通道融合矢量信号的全矢谱参数。详细论述了基于全矢谱的内插法和相位差校正法的实现过程。仿真研究和工程应用表明,基于全矢谱的内插法和相位差校正的分析方法能够在频率分辨率不足的情况下得到准确的振动参数,提高了频谱分析的精度。
     结合目前密集频谱校正的研究现状,客观分析了密集频谱对频谱分析精度的影响,分析将全矢谱技术和密集频谱校正方法相结合在故障诊断分析中的必要性。提出了复解析带通滤波器的选带细化方法和全矢谱相结合的分析方法,详细介绍了原理、算法步骤和实现过程,并进行了仿真试验。结果表明这种全矢谱细化有很好的实时性、准确性,从而提高频谱分析技术在密集频谱领域中的应用性。
Full vector spectrum is a novel technology which is developed from fault diagnosis and analysis of large rotating equipment enhances the precision of diagnosis and boost up the engineering practicability of the technology. The traditional vibration signal analysis based on single channel has not already been able to meet the need of fault signature abstraction and fault analysis in practical engineering. Full vector spectrum makes full use of fusion information using the source from two channels to get the fast, robust and accurate access to all the useful information that the vibration signals contain.
     Correction of spectrum is to improve the accuracy of spectral analysis. In the view of the existing spectrum correction technology only for single source signal or the single channel signal of the same source, the correction methods for vector spectrum of fusion vector signals generated by two channels is proposed. The principle, methods and the realization process of the interpolation correction, the energy center of gravity correction, the FFT+FT spectrum zoom and several spectrum correction based on phase difference are introduced in detail. The correction of spectrum of signals with three different window functions is analyzed and compared as well as the results of three spectrum correction based on phase difference. The combination of full vector spectrum and interpolation method with Hanning window and its combination with phase difference correction of two consecutive signals are proposed.
     The combination of full vector spectrum based on interpolation method with Hanning window and its combination with phase difference correction of two consecutive signals is researched and implemented. The principle of the two methods is that correction theory of traditional analysis method based on FFT is applied on the full vector spectrum, the accurate value of the full vector spectrum parameter of double channels'fusion vector signal which is not sampled in the way of synchronous integrated period. The implementing process of interpolation method and phase difference correction based on full vector spectrum is introduced in detail. Simulation results and Engineering Application demonstrate that interpolation method and phase difference correction based on the full vector spectrum can achieve the vibration parameters accurately under the condition of low frequency resolution and improve the applicability of spectrum technology.
     Combined with the present research situation of intensive spectrum and objectively analyzing the impact of intensive spectrum on the accuracy of spectrum to propose the necessity of the combination of intensive spectrum correction method and full vector spectrum in fault diagnosis. The full vector spectrum combined with selected band zoom method, using multiple analytical band-pass filter is proposed. The principle, algorithm and implementing process are introduced in detail, simulation is carried out. The results show that the zoom vector spectrum implemented by this method has high accuracy and good real-time performance, thereby improving the applicability of spectrum analysis technique in intensive spectrum environment.
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