Aerodynamic Optimization Design Of Single-shaft Multi-car High Speed Elevator In Multiple Operation Conditions And Its Application

In modern cities,with the increasing demand for the vertical transportation system for high-rise and super high-rise buildings,the single-shaft multi-car elevators have been widely used.However,a series of aerodynamic problems,such as aerodynamic drag,aerodynamic noise and low frequency vibration,will cause great impact on elevator ride comfort and safety when elevator operates at high speed.In this thesis,analysis of aerodynamic characteristics of single-shaft multi-car high speed elevator in multiple operation conditions,structural design of key aerodynamic components,optimization of aerodynamic parameters was intensive studied.Aerodynamic optimization design of single-shaft multi-car high speed elevator in multiple operation conditions was put forward,which was applied in the design and development of KLK2 high speed elevator.The main contents of this dissertation were summarized as follows:In the first chapter,the present statuses of aerodynamic characteristics of single-shaft multi-car high speed elevator were summarized.The present researches of multi-car elevator system,aerodynamic performance and aerodynamic optimization were discussed.The shortcomings of the existing methods were pointed out.The main contents and the organization framework of this dissertation were presented.In the second chapter,the analysis method of aerodynamic characteristics of single-shaft multi-car high speed elevator in multiple operation conditions was proposed.The numerical model for the aerodynamic characteristics of single-shaft multi-car high speed elevator based on the RANS is established.The aerodynamic characteristics of single-shaft multi-car high speed elevator in three operating conditions:one car meets another car or counter-weight in opposite direction and one car exceeds another car was analyzed.The influence of the operating speed and distance between moving components on the aerodynamic performance was obtained.The air flow in the elevator shaft was analyzed based on the control volume method.The mathematical model of the piston wind was established.The formation mechanism of aerodynamic problems was revealed.In the third chapter,the design method of the key aerodynamic components of single-shaft multi-car high speed elevator based on TRIZ theory was proposed.A good streamlined ellipsoidal cylindrical airflow shroud and a set of shaft vents were designed based on TRIZ theory.The aerodynamic performance of shrouds and vents has been verified through simulation.The influence of airflow shroud parameters on aerodynamic drag and influence of air vent parameters on airflow distribution were analyzed.In the fourth chapter,the optimization method of aerodynamic parameters of single-shaft multi-car high speed elevator based on multi-objective game was proposed.Firstly,the aerodynamic multi-objective optimization model for single-shaft multi-car high speed elevator was constructed.A GEP approximate model was established based on Latin hypercube design.The approximate model was solved by the cooperative competitive equilibrium game optimization design method.The aerodynamic performance was improved.The aerodynamic optimization of KLK2 single-shaft multi-car high speed elevator was studied as an example to verify the feasibility of the optimization method.In the fifth chapter,functional modules of aerodynamic characteristics optimization system of high speed elevator was developed combined with the enterprise project,which was applied to the aerodynamic optimization design of Kangli KLK2 single-shaft Multi-car high speed elevator.The validity of the method and system was verified.In the sixth chapter the research contents of the whole dissertation were summarized,and the further research direction was prospected.