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一引言大型信号处理系统和模态分析系统都具备三维谱图或振型动画显示功能。近年来,国内许多单位在配有模数转换器A/D的小型机或微型机上开发了信号处理和模态分析的软件,使得在不具备专用信号处理系统的情况下,利用目前已较普及的微型机或小型机也可以进行信号处理和模态分析工作。本文旨在介绍三维谱图、空间曲面的二维制图以及振型的动画显示原理。根据这些原理,可以方便地编制实用程序从而使得所开发的软件分析系统具备形象的图形输出功能。二三维谱图在转子动力学试验的特征分析中广泛使用转速谱图、时间谱图等三维谱图。图1是用PDP11/34计算机驱动HP7221A绘图仪绘制的某大型电站汽轮发电机基础的时间谱图。它的横坐标为频率,纵坐标上绘出了六十根谱线,每一根谱线代表一个时刻进行FFT分析的功率谱。 FFT
I. INTRODUCTION Large signal processing systems and modal analysis systems have three-dimensional spectral or vibration mode animation display. In recent years, many domestic units have developed software for signal processing and modal analysis on minicomputers equipped with analog-to-digital converter A / D, making it possible to make use of the more popular signal processing systems The minicomputers or minicomputers also perform signal processing and modal analysis. The purpose of this paper is to introduce the three-dimensional spectrogram, the two-dimensional mapping of the space surface and the animated display principle of mode shapes. According to these principles, the utility program can be easily compiled so that the developed software analysis system has the image output function. 2D and 3D spectrographs Three-dimensional spectra such as speed spectrum and time spectrum are widely used in the characterization of rotor dynamics test. Figure 1 is a time chart of a large-scale power station turbine generator plotted on a PDP11 / 34 computer-driven HP7221A plotter. Its abscissa is the frequency, plotted on the ordinate sixty spectral lines, each spectral line represents a time FFT analysis of the power spectrum. FFT