管壳式换热器的振动特性分析及模态试验

Vibration characteristics analysis and modal experiment of shell and tube heat exchanger

针对某一型号管壳式换热器管程入口和出口处容易损坏的问题,采用有限元模态分析和试验模态分析相结合的方法,对其动态特性进行了分析。研究结果表明其固有频率在180 Hz以上,避开了流体诱导振动产生的激振频率,但需加强其管程入口和出口处的刚度和壳体螺栓连接部位的连接强度。有限元模态分析方法可为其他类型管壳式换热器的动态特性快速评价和可靠性优化设计提供参考。

Aiming at the entrance and exit of one type of shell and tube heat exchanger are easily damaged. With the eombination of finite element model analysis and experimental model analysis, the dynamic, characteristics of the heat exchanger were analyzed. The results indicate that its natural frequency is above 180 Hz which avoids the excitation frequency produced by flow-induced vi- bration, but the stiffness of tube entrance and exit and the connection position strength between shell and bolt need to be strength- en. The finite element modal analysis method is verified by experiments which eould provide references for rapid evaluation of dy- namic characteristics on other types of shell and tube heat exchanger and reliability optimization design.