Time-varying Element Model Of Hoist Rope For High Speed Elevator And Its Application In Vibration Damping Design

With the acceleration of the process of urban modernization,the demand for high-speed elevators is also increasing.Meanwhile,higher requirements for the stability and comfort of elevator operation are put forward.In this paper,the time-varying characteristics of tractive ropes of high-speed elevator are studied.A time-varying unit model.of tractive ropes is established according to time-varying characteristics.Transient responses of tractive ropes are solved by precise integration,and the factors influencing vibration of tractive system are analyzed.A method of vibration damping of the traction system based on the time-varying element model of the traction rope is proposed.The optimization design system for the traction system of high speed elevator is developed and applied to the research and development process of KLK2 type high speed elevator.The first chapter summarizes the research status of vibration analysis and vibration reduction technology for high-speed elevator,and the research status of key technology of high-speed elevator traction system design,and gives the research background and significance of this paper.The research content of the paper is clarified,and the organizational structure of the paper is introduced.In the second chapter,the basic structure of the high speed elevator and the traction system are studied.The space hyperbolic structure of the traction rope is established.The time-varying characteristics of variable stiffness,variable damping and variable mass of the traction rope are studied.Using the energy representation of the traction system and combining the Lagrange function,the vibration equation of the traction rope system is established,and the time-varying element model of the towing rope of the high speed elevator is established.Taking the high speed elevator for example,the vibration analysis process of the traction rope of the elevator is established.In the third chapter,the precise integration method for the time-varying element model of the towing rope of the high speed elevator is proposed.The polynomial curve is used to fit the whole motion process of the high speed elevator.Taking the high-speed elevator as an example,the influence of tractive system parameters,such as drag rope density,elastic modulus of tractive rope,stiffness of side rope spring,car side rope spring stiffness,tension mechanism damping and tension mechanism stiffness,on the vibration of traction system is determined.The fourth chapter studies the evaluation index of high speed elevator vibration,considering the time-varying characteristics of the traction rope,the establishment of the damping optimization design parameters of high-speed traction elevator system,as the target function of the optimization to high speed elevator horizontal vibration acceleration and vertical vibration acceleration,construct the evaluation index system to meet a vibration reduction performance of the multi-objective optimization model of multi degree of freedom.The artificial fish swarm algorithm based on variable step length adaptive algorithm is used to solve the multi-objective optimization model and determine the optimal solution.The fifth chapter is based on the time-varying characteristic analysis method of traction rope,the establishment and solution method of traction rope time-varying unit model and the damping design method of traction system,which is applied in the design of traction system of high speed elevator.The sixth chapter summarizes the main research results of the paper,and looks forward to the shortcomings of the research.