Study On Vibration Modeling Of Aerial Ropeway Operation

With the wide application of engineering ropeway in various engineering fields,the research on dynamics and control of engineering cable has attracted very much research attention.The suspension system of aerial ropeway is one of the most complex systems,and its research involves much complexity,challenges and engineering practicality.Vibration and stability analysis is a basic problem in the research of suspension dynamics,which plays an important role in the development of mobile devices.Firstly,being used the maximum span substitution method,considered the relationship between saddle and horizontal tension under the load bearing channeling shift.Simplified the multi span cableway model into a single span cableway and studied the statics and dynamics respectively.It is shown that the maximum span replacement method is feasible in the study of multi span cableway.In the study of multi span cable dynamics,The movable bearing with the support boom is regarded as the equivalent model of the vibration mechanics at the end of the suspension.Secondly,The overhead skidding single span cableway with full suspension reinforcement is used as an example.Based on the theory of string vibration,The free vibration due to instantaneous elastic energy release during suspension in the automatic unloading situation is analyzed.The establishment of the suspension vibration equation in automatic unloading specified location,The natural frequency,period and other characteristic parameters,the main vibration and the transverse free vibration response of the cable under unloading condition are analyzed.Then,be discussed the lifting mechanism of overhead cableway lifting,in the lifting process of crane,the structural dynamic characteristics are complex,The operation process of lifting heavy objects into two typical working conditions of the overhead skidding single span cableway with full suspension reinforcement are analyzed,The vibration mechanics model of the hoisting process is established respectively,and the equation is established and solved by Lagrange method,then the vibration characteristics of the hoisting process are analyzed.Being used Euler beam model under the influence of axial force on bearing cable,through the establishment of the dynamic vibration control equation of suspension cable under concentrated load,used Newmark method to solve the equation,the influence of the speed of the carriage on the vibration displacement and the maximum tension of the cable is obtained,and combined with the engineering case numerical simulation.The simulation results show that the maximum displacement and the maximum tension of the cable are obtained when the carriage passes through the midspan.Comparison of the time history of vertical displacement of bearing cable and lifting load under the concentrated load at a distance of different displacement and different running speeds.Finally,Being overall considered the influence factors of the suspension movement under the support of the suspension,a model is proposed to realize the establishment of the modal equation of the suspension bridge,and discussed to introduce axial force in order to achieve the purpose of suppressing multi modal vibration of suspension cable under support transition,it is lay the foundation for the future research of suspension dynamics under the support transition.