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中文摘要：
对采用ANSYS有限元软件计算U形管固有频率的方法进行了详细的介绍，并将计算结果同实验数据和工程常用简化方法进行了比较，得出了如下结论：有限元计算方法更为精确；Moretti-Nguyen三跨简支子系统计算方法与TEMA方法同有限元计算方法相差较大，全系统的方法同有限元计算最为接近；当R/l较小时，端跨长度变化对U形管固有频率可能产生很大影响，在一定的参数范围内可近似地按多跨直管对U形管进行近似。
英文摘要：
In this paper, the finite element calculation method for natural frequency of U-tube using ANSYS software was introduced in detail. The results were compared with that from experiments and that from simplified method which is commonly used in engineering. The conclusions were as follow： the finite element method is more accurate than simplified methods; there are significant differences between the results from Moretti-Nguyen＇s three-span subsystem method or TEMA＇s method and that from finite element method, and the results from full system method shows most identical to that from finite element method; the changes in ends length may cause significant influence on natural frequency when the parameter R/I is relatively small, and U-tube system can be calculate approximately by using multi-span straight tube system within some parameter scope.
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