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本文通过分析和程序计算,作出一跨至三跨弹支粱固有频率特性曲线,阐明振型演变规律,并得出对于多跨梁从低阶到高阶每N个模态振型有一个固有频率相等的点,而且这些点所对应的刚度比与跨数无关.应用该曲线可准确、方便地求出相应于各种振型的弹支梁的固有频率.还提出考虑支承参与振动质量的固有频率的简便算法.
In this paper, the natural frequency characteristics of a three-span elastic bracing beam are obtained by analysis and calculation. The evolution law of mode shapes is clarified. It is found that there is an inherent characteristic for multi-span beams from N-mode to N-mode. And the stiffness ratio corresponding to these points is independent of the span number.Using this curve, the natural frequencies of the elastic support beams corresponding to various vibration modes can be obtained exactly and conveniently.It is also proposed that considering the support participation in the vibrational quality Simple method of natural frequency.