Dynamic Analysis And Optimization Of Anti-vibration And Vibration Reduction Of High-speed 300-pipe Winch

Large-diameter steel wire rope is an indispensable key component in the fields of bridges,ships and vehicles,and its performance directly determines the reliability and safety of largescale engineering equipment,and the performance of steel wire rope largely depends on the dynamic performance of its twisting equipment.As the main equipment of wire rope twisting,the mechanical vibration of high-speed pipe winch will lead to uneven stress on each wire rope during its operation,which will further affect the performance of the whole wire rope,such as tension and fatigue strength.Therefore,reducing the vibration of pipe winch is of great significance to improve its operation stability,improve the performance and life of wire rope.Therefore,this paper will take the high-speed 300-pipe winch as the research object.Based on the finite element theory and optimization method,the dynamic simulation analysis of the key components of the pipe winch,such as the cylinder,the base and the big bearing,is carried out.Combining with the structural characteristics of the key components,different optimization methods are used to optimize the dynamic characteristics,and the optimization effect is further clarified through the whole machine simulation,so as to improve the antivibration and vibration reduction performance of the whole machine of the high-speed pipe winch.Firstly,the three-dimensional model of the structure is established by using the known structural design parameters of the real pipe winch,the causes of the vibration of the pipe winch are analyzed,the main excitation sources of the vibration of the pipe winch are clarified,a two-degree-of-freedom vibration system is established,and the steady-state solution is carried out.Based on this,the corresponding anti-vibration and vibration reduction strategies are put forward,that is,increasing the natural frequency of the structure,improving the structural stiffness,reducing the mass,etc.,to achieve system anti-vibration,reducing the amplitude to achieve active vibration reduction,and consuming vibration energy to achieve passive vibration reduction.Secondly,the dynamic response characteristics of the pipe winch cylinder are studied by modal harmonic response analysis,and the influence of the number of openings on its vibration characteristics is explored.On this basis,the optimization of cylinder response surface based on Kriging is carried out.The design variables are screened by sensitivity analysis,and the optimal scheme of structural size and material parameters is obtained by combining with multi-objective genetic algorithm.The results show that compared with the original three-hole cylinder,the first two natural frequencies of the optimized cylinder are increased by 189% and 359.7% respectively,and its mass is reduced by 39%,which realizes the structural vibration resistance improvement and lightweight design of the cylinder.Then,the simulation analysis of the vibration characteristics of the pipe winch base is carried out to clarify the vibration characteristics of the base and its vibration response under the harmonic excitation of the cylinder.Based on the variable density topology optimization method,the natural frequency of the base is increased by more than 60% by adding side ribs,and the stiffness and strength are increased by 93.3% and 82.6% respectively.Based on the simulation results of optimized side ribs,the particle dampers are designed and arranged reasonably.The influence of particle parameters on the vibration energy loss of the base is explored through discrete element simulation,and the particle parameters with the largest vibration energy consumption are obtained,thus realizing the composite anti-vibration and vibration reduction optimization of the pipe winch base.Afterwards,through the dynamic simulation analysis of the big bearing,the vibration response of the big bearing under the simple harmonic excitation of the cylinder is clear.On this basis,the dynamic stiffness of bearing is calculated,and the influence of excitation frequency and bearing parameters on dynamic stiffness is analyzed.At the same time,in order to reduce the influence of bearing thermal deformation on vibration,the bearing thermalmechanical coupling simulation is carried out to analyze the influence of thermal load on bearing deformation.In order to reduce the bearing temperature,the influence of working speed and bearing parameters on the working temperature is explored.Finally,in order to improve the dynamic stiffness of the bearing and reduce the working temperature of the bearing,the optimization scheme is obtained: the working speed is as small as possible and the number of rolling elements is as large as possible,and the rolling elements are made of Si3N4 ceramics.Finally,in order to verify and further clarify the optimization effect of the key components mentioned above,the dynamic simulation analysis of the whole pipe winch before and after optimization is carried out.Through comparative analysis,it is found that the natural frequency of the whole pipe winch after optimization has been significantly improved,and the vibration displacement at the resonance frequency of the original pipe winch has been greatly reduced,thus realizing the optimization of the whole machine’s anti-vibration and vibration reduction,making it run more stably at high speed,and further promoting the reliable improvement of the performance and life of the wire rope.