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扭振计算通常采用的是线性集中参数模型(轴盘系统),这种模型只是在低频范围的分析才是正确的.此外,轴系分布质量的聚缩常常凭工程人员的直观而决定的,同一轴系可离散成不同的轴盘扭振系统.这些都是这种模型的局限性.为适应更高精度分析的需要,就必须改善计算模型.在线性集中参数模型的基础上,将那些分布质量特性比较突出的轴段作为连续体耒处理,而不进行质量的聚缩,形成一个间有分布质量轴段的扭振分析模型. 运用H_o1_(zer)型传递矩阵法对此模型编制了电算程序.算例充分说明:采用间有分布质量轴段的扭振计算模型能有效地克服集中参数模型由于不合理的聚缩质量方式所带来的局限性.这种局限性不仅会影响低结点振型的频率和振型的准确性,而且会出现丢失低结点振型的情况(如三结点振型).
The torsional vibration calculation usually takes the form of a linear concentration parameter model (axis-plate system) which is correct only in the low-frequency range. In addition, the quality of the shaft mass distribution is often determined intuitively by engineers, The same shaft system can be discretized into different torsional vibration system of the shaft, these are the limitations of this model.In order to meet the need of more accurate analysis, we must improve the calculation model.Based on the linear centralized parameter model, The torsional vibration model with the axis with distributed quality features is treated as a continuum,, without mass polycondensation to form a torsional vibration analysis model with distributed mass axial sections.The H_o1_ (zer) Computer program.The example fully shows that the torsional vibration model with distributed mass shaft section can effectively overcome the limitations of centralized parameter model due to unreasonable polycondensation quality mode.This limitation not only affects The frequency of the low node mode and the accuracy of the mode shape, and the case of losing the low node mode (such as the triple node mode) may occur.