Study On The Vibration Absorption Characteristics Of Space Pipeline Dynamic Vibration Absorber

Pipeline system has a wide range of applications in military,scientific research and People’s Daily life.It is mainly used to transfer mass flow,momentum flow or energy flow.The fluid-structure coupling effect is easy to occur in the working process of the pipeline system,resulting in strong vibration and noise,which will have a serious impact on the safety of the equipment connected to the pipeline system and the comfort of the surrounding environment,and even cause huge losses.Research on vibration characteristics of space piping system can provide some theoretical support and scheme for vibration and noise reduction of piping system.In view of the vibration and noise reduction of pipeline system,a large number of researchers have put forward a variety of vibration reduction methods and analyzed the research.This is of great significance to the improvement of the country’s comprehensive strength,the sustainable development of society and the comprehensive utilization of resources.In this paper,based on the knowledge of analytical mechanics and vibration mechanics,the vibration and noise reduction of the pipeline system is studied.The three-dimensional coupling vibration dynamic equation of the pipeline system is established,the numerical calculation and simulation calculation of the pipeline dynamic vibration absorber system and the experimental verification of the pipeline dynamic vibration absorber are carried out.Specific research contents are as follows:First of all,the simplification of piping system,and based on the theory of vibration mechanics elastomer vibration to establish a single straight tube space continuum transfer matrix,and then according to the relationship of displacement and force to establish lumped mass transfer matrix,the elastic supporting space branch transfer matrix and transfer matrix,arbitrary Angle along three axes rotational coordinate transformation matrix.These transfer matrices were splice and multiplied according to the actual pipeline model and the inherent characteristics of the pipeline system were solved by combining the boundary conditions at both ends of the pipeline.The forced response of piping system is obtained by direct solution method.Secondly,the dynamic vibration absorber is simplified into a mass-spring-damping structure and introduced into the pipeline system,and the kinetic energy,potential energy and generalized force of the pipeline system with the dynamic vibration absorber are substituted into the second type of Lagrange equation to reduce the vibration.The correctness of the derivation of the theoretical formula is proved by comparing the theoretical calculation with the finite element calculation of several simple examples.Finally,the theoretical model of complex pipeline is established to calculate the response of different positions of different vibration absorbers under different excitation forces.The test bench of the pipeline system was built,and the modal test and response test of the complex pipeline test bench were carried out without and with the vibration absorber.By comparing the theoretical calculation results with the experimental results,the correctness and feasibility of the theoretical method in this paper are proved again.