Stability Analysis And Design Optimization For The High-speed Elevator Car Dynamics Parameters

With the development of the height and speed of the elevator, a series of stability problems occur, like transient aerodynamic force changes, aerodynamic noise, vibration of the tractor and life car which are caused by high-speed elevator. In this paper we discussed the factors of the elevator stability, including the transient air pressure change of the count weight and car airflow shroud, different flexible parameters of the elevator drive system flexible parameters and different cars elastic element stiffness. Furthermore, a preferred method of the high-speed elevator stability parameters based on coupling spreading orthogonal algorithm is proposed.The main contents of the dissertation are as follows:In the first chapter, make a brief look of the elevator technology development and introduce the current research situation of the high speed elevator aerodynamic characteristics and vibration plus the relevant parameters optimization methods. In addition set the assessment parameters of the high-speed elevator stability. In the end, the background, major content and framework of the research are presented.In the second chapter, research the complex aerodynamic changes of the high-speed elevator in the hoistway and propose the influence that the elevator car-block system caused to the elevator stability.Then focus on the transient air force (lateral lift force and aerodynamic drag force) change that the different lateral spacing between the car and counterweight caused, design a streamlined shroud and analyze the impact of its relevant parameters on the transient aerodynamic force to analyze the elevator stability and then provide the basis for the elevator stability parameter optimization.In the third chapter, study the effects that the high-speed elevator drive system vibration caused to stability of high-speed elevators and propose the influence that flexible parameters of the elevator drive system caused to the elevator stability. Take relevant theoretical analysis and simulation of the elevator drive system’s vibration characteristics to tell impacts that relevant vibration factors caused on the elevator stability. Then simulate different rope equivalent stiffness and traction rubber equivalent stiffness to see the frequency response, acceleration and displacement analysis they taking. Obtain the influence they take to the elevator stability.In the fourth chapter, study the effect that the high-speed elevator car system vibration caused to stability of high-speed elevators and propose the influence that elastic element parameters of the elevator drive system caused to the elevator stability. Establish vertical and horizontal vibration dynamical model and do the related modal analysis to reach corresponding modes and through the vibration frequency response analysis to get appropriate vertical resonance frequency. Combine with factors that lead to vertical and horizontal vibration and adjust the elastic element stiffness of the elevator car system (the different elevator car bottom equivalent stiffness coefficients, the wheel frame Idler stiffness) to get the impact of the elastic element stiffness of the elevator car system taking to the elevator stability.In the fifth chapter, in order to improve the elevator stability, propose a preferred method of elevator stability parameters based on coupling spreading orthogonal algorithm. Taking advantage of orthogonal test in solving Single-objective optimization problem, proposing spreading orthogonal algorithm based on the strength of the coupling between the high-speed elevator car dynamics parameters, offspring with niche evolution in order to achieve optimized muti-stability -objective. Take the series KLK2 of high-speed elevators for example and optimize High-speed elevator stability model.In the sixth chapter, the further research is put forward after summarizing all the content and achievements of the dissertation.