干线石油管道振动的ANSYS分析

Vibration Analysis for Piping Connected with Reciprocating Compressor by Using ANSYS

针对常见的管道振动情况,通过分析得出其主要原因是管系结构固有频率与激发主频率相近而造成共振。管道系统振动的原因主要有两方面:介质对管道系统产生的振动力,即激发信号,如分支节点部位产生的振动力;对激发信号的响应,其响应除了和激发信号的波形有关外,还和管道系统本身的特征,即系统的刚度、质量及其配置等情况有关。通过理论计算得到泵的激发主频率,再利用ANSYS分析软件对管系进行模态分析,得到系统的低阶固有频率和振型。计算表明,激发主频率与低阶固有频率相近。在不改变管系主要特征和管道结构的基础上,给出了简单易行的减振措施,具有重要的指导意义。

With respect to the vibration that commonly occurs in compressor piping,an analysis is carried out in this paper.The main cause is probably that the inherent frequency of the piping system is close to the excitation frequency so as to form resonance.By theoretical calculation,the former eight frequencies excited from the compressor were obtained.Then,by using ANSYS,the modal analysis for the inherent frequency of the piping system was carried out,from which the low inherent frequency and vibration modals of the system were also obtained.Based on the analysis,the fact that the inherent frequency of the piping system falls into the resonance area has been verified.Finally,a feasible method to reduce this vibration on the basis of keeping the major character is presented,which can be of significance to practical engineering.