Research On Vibration Transfer Characteristics Of Floating Platform Compressor

As land oil and gas resources are gradually exhausted,countries also turn to the deep sea,which is rich in oil and gas resources.The deep sea environment is complicated and changeable.The compressor unit of the floating platform will be subjected to strong external environmental load during the development of oil and gas resources.The compressor and related equipment of the floating platform are usually integrated on a skid.The equipment layout on the skid will be more compact and the energy transmission of vibration will be greater.The natural frequency of some equipment on the compressor skid of the floating platform is low.For example,the gas transmission pipeline will produce large vibration when excited by the deep-sea environment,the unit itself and the surrounding adjacent units.Excessive vibration for a long time will cause fatigue fracture of the connection,lead to the leakage of flammable and explosive high-pressure gas,cause safety accidents and endanger the life and safety of platform personnel.Therefore,it is especially crucial to study the vibration characteristics of floating platform compressor to ensure the safety and stability when the unit operates.In this paper,the finite element simulation analysis and modal parameter identification of an offshore platform compressor unit are carried out.The main work is as follows:(1)Based on Timoshenko beam theory,a set of dynamic analysis software of pipeline is independently developed,which has the ability of modeling high-dimensional mass and stiffness matrix,and has the functions of dynamic analysis such as modal solution and harmonic response analysis.Through the graphical user interface development tool Py Qt5 and three-dimensional kernel Open Cas Cade,the human-computer interaction interface is developed for the software,which provides a friendly interactive experience for the pre-processing part such as the model establishment of the pipeline system and the post-processing part of the solution result display.(2)The modal parameters of the floating platform compressor unit are solved by finite element simulation.The parts with low natural frequency and the vibration sensitive points that may resonate with the compressor are analyzed.At the same time,the influence law of the flexible support structure of the floating platform on the modal solution results of the compressor unit is analyzed.(3)According to the results of finite element analysis,the vibration measurement is carried out for the point where the pipeline on the machine skid may be vibration sensitive.The measured response signals are identified by stochastic subspace method.The modal parameters are picked up through clustering.The identification results provide a theoretical basis for the vibration reduction and suppression of the pipeline.(4)A set of data acquisition and modal parameter identification software is developed based on Python.The transmission of response signal in the data acquisition part is realized through TCP / IP protocol,and the functions of data storage,waveform display and data backtracking of response signal are developed.The modal parameter identification part is based on stochastic subspace method.The whole process from data acquisition to modal parameter identification can be easily completed by software.