With the rapid development of modern cities and population,high-rise / super high-rise buildings are emerging day by day,and the demand for high-speed/ super high-speed and large distance elevators is becoming more and more prominent.However,due to the constraints of urban land resources,building space area and other conditions,the design of elevator hoistway usually presents a narrow and relatively closed environment.When the elevator runs at highspeed/super high-speed in this environment,it is bound to strongly disturb the complex hoistway airflow around the car.At the same time,the violent change of hoistway air flow and the elevator with slight horizontal vibration are coupled,so that the horizontal vibration amplitude of the elevator is continuously amplified.In addition,the high-speed/super high-speed elevator also has the stage of instantaneous intersection between counterweight and car during operation,which further has a serious impact on the hoistway flow field around the car,and will also react on the car surface and produce a strong disturbance,which seriously threatens the stability and safety of elevator operation and makes passengers feel great discomfort.Therefore,accurately exploring the hoistway airflow-car gas-solid coupling horizontal vibration response and aerodynamic characteristics of high-speed/super high-speed elevator in the real service environment has great theoretical and engineering practical value for the research of vibration reduction control strategy,optimization of shaft structure,installation and manufacturing of high-speed/super high-speed elevator,and makes up for the deficiency of the research on airflow-car gas-solid coupling horizontal vibration in the elevator field to a great extent.Firstly,considering the characteristics of hoistway airflow induced by high-speed/super high-speed elevator and the structural composition of car system,based on computational fluid dynamics and nonlinear transient dynamics theory,the control equation of hoistway flow field and the general form transient dynamics of car horizontal vibration were analyzed;Through the unidirectional coupling and bidirectional coupling analysis methods,combined with the establishment of the random excitation model of guide rail irregularity,a three-dimensional finite element calculation model of hoistway airflow-car gas-solid coupling suitable for elevator operation characteristics was constructed,so as to explore the horizontal vibration characteristics of high-speed and super high-speed elevator hoistway airflow-car gas-solidcoupling,which laid a model foundation for the follow-up study of hoistway airflow car gassolid coupling.Secondly,considering the real-time bidirectional interaction coupling between the hoistway air flow and the car in the real environment,on the basis of establishing the threedimensional calculation model of hoistway flow field,combining the car gas-solid coupling three-dimensional finite element calculation model,the coupling module of the System Coupling system was used to complete the independent cyclic iterative calculation and data exchange of the hoistway airflow field domain and the car solid domain,a three-dimensional numerical calculation model of bidirectional gas-solid coupling vibration of hoistway airflow and car was constructed and verified by real elevator experiment;Based on this model,the aerodynamic load and horizontal vibration acceleration of the car under the unidirectional and bidirectional coupling of hoistway airflow and car at different operating speeds were solved.At the same time,the influence degree of the two coupling methods on the horizontal vibration response of the car was compared and analyzed,and the influence law of the change of car vibration attitude on the fluctuation of aerodynamic load under the bidirectional coupling was studied.It provided some theoretical support for the research and development of the optimal damping device of high-speed / super high-speed elevator.Then,considering the hoistway airflow-car gas-solid coupling existing in the instantaneous“encounter” intersection of high-speed/super high-speed elevator counterweight-car,based on the dynamic paving grid technology,a three-dimensional calculation model of hoistway flow field in the process of counterweight-car intersection was constructed,and the transient law of“shear” aerodynamic load in the instantaneous intersection of super high-speed elevator counterweight car was explored.Combined with the three-dimensional finite element calculation model of hoistway airflow-car gas-solid coupling,based on the unidirectional coupling analysis method,the equivalent aerodynamic load calculated in the calculation domain of hoistway flow field was transferred to the car,and a three-dimensional numerical calculation model of hoistway air flow car one-way gas-solid coupling suitable for the operation characteristics of counterweight-car instantaneous intersection was constructed.The correctness of the model is verified by real elevator experiments;The horizontal vibration responses of the car under the action of no air disturbance(only wheel rail random contact excitation),gas-solid coupling in the stage of no intersection(single car operation)and gas-solid coupling in the instantaneous intersection of counterweight and car based on different opposite intersection speeds were further compared and analyzed,so as to improve the gas-solid coupling horizontal vibration model of high-speed/super high-speed elevator.Finally,combined with the above research on the gas-solid coupling vibration characteristics of hoistway airflow and car at different operating speeds,based on the verified horizontal vibration calculation models of hoistway airflow and car bidirectional gas-solid coupling and counterweight car instantaneous intersection gas-solid coupling,taking the car load,counter weight car transverse spacing and counterweight-car coincidence degree(the ratio of counterweight width to car width)as the main key parameters,the gas-solid coupling horizontal vibration characteristics and aerodynamic load variation law of high-speed/super high-speed elevator under the operating conditions corresponding to the sensitivity of the three key parameters were explored respectively,which provided an important theoretical reference for practical engineers and technicians for elevator installation and design. |