Vibration Reduction Characteristics Of Pipeline System Based On Particle Collision Damping Technology

Pipeline system consist of pipeline bodies,joints,and support clamps,and are connected to pumps,valves,actuators,etc.They are widely utilized in fields,including aerospace,marine vessels,and the petrochemical industry for the transportation of fluid mass flow,energy flow,and momentum flow.Besides,the structural form of the pipeline system is intricate and the working environment is harsh.Under the stimulation of the foundation and pump source,it is probably easier to generate excessive vibration,which can result in pipeline system problems such as pipe collision,fatigue wear,and rupture leakage.Furthermore,the traditional vibration reduction methods for pipeline system mainly include clamp support vibration reduction,laying viscoelastic damping materials on the pipe surface,and installing tuned mass dampers on the pipeline body.Poor lowfrequency vibration reduction effect,limited installation position,easy deformation,aging,and failure of damping materials are their shortcomings.However,they have good suppression effects on the high-frequency vibration of the pipeline.The primary mechanism for energy dissipation in particle damping technology is collision and friction between particles,as well as between particles and container walls.It benefits from a broad temperature range,a broad frequency range,radiation resistance,and high dependability.Currently,domestic and foreign scholars have obtained some research results regarding the mechanism of particle collision damping vibration reduction,and yet there is relatively little research on the vibration reduction of pipeline system.Hence,this paper introduces particle collision damping technology into the pipeline system and uses a combination of simulation analysis,numerical calculation,and experimental testing for the purpose of analyzing the impact of particle collision damping parameters on the energy dissipation characteristics of the damper structure.Moreover,the mechanical parameter identification method for particle collision damping is proposed,and the experimental validation of particle collision damping damper vibration suppression in the pipeline system is accomplished.And the main research content of this article is as follows:(1)The contact mechanics models between particles and between particles and container walls have been developed,and the mechanism of energy dissipation by particle collision damping has been uncovered.In accordance with the design requirements and structural characteristics of the pipeline system,pipeline particle collision damping damper were designed using two materials and three unit structures.Besides,the discrete element software EDEM was adopted to analyze the effects of material and structure,external excitation,as well as other parameters of the particle collision damping damper regarding the energy dissipation characteristics of the particle collision damping system.(2)A method for the mechanical parameters identification of particle collision damping dampers was proposed,and hammer testing was used to determine the equivalent stiffness and damping coefficient of particle collision damping dampers with varying filling rates.A pipeline system dynamics model that accounts for particle collision damping has been developed,and the accuracy of equivalent stiffness has been validated by comparing experimental results and numerical calculations.Furthermore,the Newmark stepwise integration method was utilized to calculate the vibration response of the pipeline prior to and subsequent to the additional particle collision damping damper.And the accuracy of the damping coefficient was verified through comparative experimental testing and numerical calculation.(3)A pipeline vibration reduction test system with particle collision damping has been established,and the vibration reduction effect has been experimentally verified and completed.The vibration reduction effect of particle collision damping dampers comprised of two materials and two unit structures on pipeline system under fundamental harmonic excitation and random excitation was compared.A particle collision damping damper was further designed for petrochemical pipeline,and experiments have demonstrated the efficacy of vibration reduction in pipeline.This paper designs a particle collision damping damper for pipeline system,indicates the influence of damper parameters on the energy dissipation characteristics of particle collision damping,identifies the mechanical parameters of particle collision damping damper,and completes experimental verification of the effectiveness of pipeline system vibration reduction.The work of this paper can provide technical references for the vibration suppression of pipeline system.