非常规换热器换热管固有频率的计算

针对非常规换热器在现代工业使用中存在振动损坏的问题，本文结合某厂的一台冷凝器，对单根换热管进行了 模态分析与谐响应分析，同时还对其管束进行了全面的模态分析。结合GB151-1999和大型有限元软件ANSYS，分析了 换热管数量对换热管束固有频率的影响，并对壁厚、最大跨距、管径和节径比4个因素进行了研究。计算结果表明，此算 例中的冷凝器是合格的，对于实际使用中出现振动损坏的问题，在以后的模态分析计算中应当考虑到实际流体作用的 影响。

Calculation of Non-Conventional Heat Exchanger Tubes Natural Frequency

Aiming at the vibration damage problem of unconventional heat exchanges in modern industry and with the example of a factory, the modal analysis and harmonic response analysis were done on the single heat exchange tube, at the meantime. the comprehensive modal analysis was performed on the condenser tube bundles. Combined GB151-1999 and ANSYS soft. this paper analyzed the influence of heat exchange tube number on natural frequency, and studied the wall thickness, maximum span, pipe diameter and lay ratio. The calculation results show that the condenser is qualified. In order to solve the problem of vibration damage in practice. the influence of actual fluid action force is needed to be considered.