结合部等效参数在往复式压缩机管线振动分析中的应用

为了解决大型往复式压缩机机组及管线振动问题,建立有效的数值计算模型,将基于等效参数的动力修改技术与基于有限元的管线振动特性分析方法相结合,提出利用结合部等效参数修正有限元模型的方法,通过将管道与附件结合部作为弹性约束处理,并进行等效刚度优化,从而还原工程现场真实振动模型。以真实模型为基础进行模态分析,结合现场实测数据,找出管线振动原因,再次利用等效参数识别技术提出改造方案,改造后管线避开了原共振频率,减振幅度达到95.4%。该方法对于所建工程现场数值模型的有效性具有重要指导意义。

Application of Equivalent Parameters of Joints in Vibration Control of a Reciprocating Compressor Pipeline

In order to solve the problem of vibration in large reciprocating compressor unit and pipeline, the effective of numerical calculation model is set up.A method of using equivalent parameters in joints to modify finite element model was proposed．With it，the pipeline vibration characteristic analysis method based on finite element was combined with the dynamic modification technology based on equivalent parameter. Restore the real vibration model about engineering field through handling the joint part of pipeline and accessories as elastic constraint and calculating the best equivalent stiffness，identified the reasons of the pipeline vibration based on modal analysis of the real model combine with the field measured data. Then using the technology about equivalent parameter identification to putting forward retrofit scheme，the pipeline avoided resonance frequency after transforming and vibration amplitude was down to 95.4%. The introduction of the method to establish the effective of the numerical model for field engineering has important guiding significance.