Noise Prediction And Study Of Rail Conveyor Based On Nonlinear Coupling Dynamics

With the development of our country’s industry,the requirements for industrial transportation are getting higher and higher.For the consideration of the cost of conveyor engineering,operating costs,and on-site installation,the traditional conveyor is transformed into a rail conveyor,which is in contrast with the traditional conveyor.In comparison,the noise on both sides of the run-time route increased significantly.Conveyors as a means of transport,the environment is not the same,some of the road sections will be close to people’s living area,the vibration noise generated during the operation will have a serious impact on people’s lives,so it is necessary to noise on the rail conveyor Conduct research and forecasting for later optimization.The direct cause of the noise generated by the conveyor is the structural characteristics of the wheel-rail system.Therefore,this paper first analyzes the vibration characteristics of the conveyor wheel-rail system,establishes the finite element model,uses the software to perform modal analysis on the wheels of the trolley,and the vibration of the truss rail system.In the characteristic analysis,the concept of admittance is introduced,and the admittance characteristics of the conveyor wheel-rail system are analyzed by analytical method.Based on the above.the vibration and noise of the conveyor wheel-rail is predicted,and the field test and prediction results are compared and analyzed.The following is the main research content of this article:First,the modal analysis of the wheel of the trolley is performed to obtain the natural frequency of the wheel of the trolley.Due to the symmetrical structure of the wheel,the symmetry of the formation characteristics is also present.When the modality is low-order,it is mainly represented by the torsion and vibration of the rim.As the order increases,the tread begins to undergo bending deformation.When the modal reaches 10th order,The wheel rim begins to become a complex nonlinear warping deformation.The differential equations of the wheel-rail relationship are analyzed by the numerical method,and the wheel-rail relationship is analyzed.The relationship between the force of the wheel rail and the time at different speeds is obtained,so as to compare with the later experimental data.The admittance concept was introduced.The velocity admittance of the truss structure was used as the evaluation standard to analyze the structural vibration.The velocity admittance amplitude of the truss was deduced by the dynamic compliance method.The velocity admittance of the truss was analyzed by software and the truss at the model origin was obtained.And the velocity admittance curve which changes with frequency at the crossover point,the velocity admittance of the two points with the increase of the frequency,the admittance at the crossing point is obviously larger than the origin,which shows that the truss vibration is mainly caused by the interaction between the wheel and the rail.The influence of the truss and track parameters on the vibration characteristics of the system is analyzed,including the stiffness of the track fasteners and the effect of the track materials on system vibration and noise radiation.Through the field test method,the vibration and noise of the conveyor wheel rail under four typical positions were obtained.The data acquisition device was used to obtain the wheel and rail vibration and noise data,and the data was compared and analyzed in the software.Based on the basic theory of noise,based on the analysis of the vibration characteristics of the wheel-rail system and trusses,the noise of the conveyor wheel-rail is predicted.The prediction results are as follows:Analyze the characteristics of wheel-rail at different operating speeds,taking speeds of 1m/s,1.5m/s,and 2m/s respectively.As the running speed of the conveyor increases,the wheel noise,track noise,and wheel-rail noise at each frequency increase.The increase in wheel-rail noise will increase correspondingly.At the same speed,the noise sound pressure level will tend to be constant with the increase of frequency.This prediction result is compared with the results of the fourth chapter field test to verify the correctness of the model.The impact of track fastener stiffness on vibration and noise is mainly concentrated on low frequency,and the stiffness parameter at high frequency has almost no effect on noise.The track material mainly studies two kinds of materials.The existing materials for wheel and rail use are gray cast iron.We studied the noise in order to reduce noise.Polymer materials are used as wheel and rail manufacturing materials.The predicted results show that polymer materials play a significant role in wheel and rail noise reduction.Due to workload constraints,we only replaced some of the polymer wheels for field testing.The test results also verified The feasibility of the model.