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运用能量法的原理，提出了近似计算连续梁基本频率和三维任意走向复杂管道系统３个低阶重要振型及频率的方法，并用算例比较了本文方法与精确方法的计算结果．
Based on the principle of energy method, a method of approximate calculation of fundamental frequency of continuous beam and three low-order important vibration modes and frequencies of arbitrary complicated pipelines in three dimensions is proposed. The computational results of this method and the exact method are compared with examples.