Vibration Characteristic Analysis Of High Power Reciprocating Compressor

High power reciprocating compressor is a kind of commonly used power machinery,which is widely used in petrochemical industry.In the process of operation,the machine under complex conditions prone to severe vibration,especially with the increase of gas pressure,compressor power,vibration is more intense,shock and vibration on the body also becomes more and more serious,so in the design stage must be on its vibration characteristics were analyzed,in order to ensure the adequate strength and stiffness.In view of this,based on the high power reciprocating compressor as the research object,the vibration characteristics and dynamic response were studied,in order to find out the vibration mechanism,vibration reduction work and then take targeted measures,establish a complete analysis of compressor vibration characteristics and control methods,to provide reference for the design and vibration of high power compressor.First of all,the establishment of 3D model of compressor's Solidworks,and the influence on the calculation results of small features smaller is simplified,and then the basic theory of finite element method based on the finite element model is established,the modal analysis of the high power reciprocating compressor crankcase and engine,the compressor crankcase free modal frequency and vibration type,the constrained modal frequency and vibration mode,and according to the modal graph extraction analysis characteristics of the various modes,to provide reference and direction for the vibration control.Secondly,according to the vibration of API618 and other related compressor testing standards,combined with the structure characteristics of the compressor,make test plan is appropriate,The experimental modal test of the whole machine is carried out by using the single point zone excitation method to obtain the experimental modal information of the whole machine,The finite element modal and experimental modal are compared and analyzed,the results show that there are some errors between the two,but are within 10%,within acceptable limits.Then,by analyzing the stress on the operating conditions,determine the load boundary condition of compressor,the same for transient response analysis with the finite element method,the transient response analysis for vibration intensity of each key point,the vibration intensity and the extraction of quasi standard requirement compared to that of the compressor vibration shall conform to the state vibration of the compressor standard GB7777,The measured results are compared with the measured results,and the results show that the errors of the simulation and the measured results are within 25%,individual data error is relatively large.Finally,according to the analysis results of finite element modal analysis and transient response,On the basis of reference to vibration control measures of power machinery,a method of modifying local structure is put forward to reduce vibration intensity,then the same analysis method is used to simulate the modified compressor model,the results show that the vibration of the compressor vibration control measures taken after the effective control.