Due to the influencing factors, such as irregularity of guide, piston wind excitation in the hoistway, and uncertain swinging of hoisting rope during the operation of high-speed traction elevator, car will produce dramatic horizontal vibration. With the purpose of suppressing this vibration effectively, the active car shock absorber is designed with linear motor, and a five-degrees-of-freedom space vibration model of the car is established and, subsequently, its state space equation is derived. For the uncertainty external excitation in the car system, the back propagation neural network proportional–integral–derivative controller with linear prediction model is designed for the intelligent active control of the vibration of the car, and simulation analysis is carried out with MATLAB/Simulink. The result shows that the active shock absorber designed in this study can effectively suppress the horizontal vibration of high-speed elevator car, better than traditional proportional–integral–derivative controller. This study has opened up a new idea of high-speed elevator vibration damping method, and is of important referential significance for the field of active control of car vibration.

To accurately explore the horizontal vibration response and aerodynamic load variation law of high-speed elevator with gas-solid interaction coupling in real environment, a mathematical and a three-dimensional calculation model of the coupling vibration of the shaft airflow and car body were established based on the arbitrary Lagrange-Euler method and the finite volume method. Additionally, the rationality of the coupling calculation model was verified by taking the working condition of 7 m/s as the test object. Then, the aerodynamic load and the horizontal vibration acceleration of the car body for different speed conditions were solved using unidirectional and bidirectional fluid-structure coupling numerical simulation methods, and the influences of the two coupling methods on the horizontal vibration response of the car body were compared and analyzed. The results showed that the aerodynamic load on the car body fluctuated greatly due to its horizontal vibration under the bidirectional coupling effect, and the peak value of the fluctuation was proportional to the second power of the running speed. When the running speed was greater than 7 m/s, the influence of the bidirectional coupling on the horizontal vibration of the car body became more prominent. The typical digital characteristics of the vibration acceleration increased by 129.70%–226.84%, and the maximum amplitude of the low-frequency vibration of the car body increased significantly. This study provides an effective method for the analysis of the gas-solid coupling characteristics of a high-speed elevator, and it provides theoretical guidance for the development of an optimal vibration damper for a high-speed elevator.

In this study, the compensating ropes and tension device on elevator vibration, as well as the car and hoisting ropes between the top of the car and traction wheel in a high-speed traction elevator lift system, were considered a system to analyze the effect of traction force. In addition, the vertical vibration of the system was used as the research object. The influence of hoisting ropes quality was measured, and a time-varying dynamic model with variable mass, damping, and stiffness for the car–hoisting rope system was constructed from the perspective of time-varying structural mechanics. Simultaneously, the ideal running state of the elevator, which is fitted by using the quintic polynomial, was utilized as input motion parameter. Then, a case study was conducted by using the fine integral method for the vertical vibration dynamic model of the car–hoisting rope system. Finally, the nonlinear vertical vibration response of the car–hoisting rope system during the operation of high-speed traction elevator was obtained. Results indicated that the influence of traction force, compensating ropes, and tension device on the vibration of the car–hoisting rope system when the elevator is in the upward process is greater than when the elevator is in the downward process. In addition, the low quality of the elevator car leads to the production of strong longitudinal vibration. The linear density of the hoisting ropes has a slight effect on the longitudinal vibration of elevator.

The strong flow field in a hoistway will cause a significant piston effect during the operation of high-speed/ultra-high-speed elevator. Thus, studying the airflow in the hoistway and the reasonable opening of ventilation holes is important. First, a three-dimensional geometric model of the ventilation holes (VHs) and elevator car was established. Based on this model, a multi-region dynamic layering method was proposed. The movement of the unsteady airflow in hoistways with different numbers of VHs and the interaction between the VHs were then analyzed. The correctness of the numerical simulation method was verified by comparing the results of the simulation, experiments and theoretical calculations. Finally, the influence of the number, location and cross-sectional area of the VHs on the airflow movement was analyzed, and the optimal opening positions of one and two pairs of VHs were discussed. The results showed that the variations of the number, location and cross-sectional area of the VHs had a significant influence on the airflow movement. According to the quantitative analysis of the ventilation efficiency, the optimal positions of one and two pairs of VHs were located in the middle of the hoistway and the upper and lower sides of the middle position, respectively.

Purpose: This paper aims to guide the implementation of noise reduction measures in hoistway and reduce the aerodynamic noise generated by elevator operation, this paper aims to propose an aerodynamic noise analysis method that can solve the flow field in hoistway. Design/methodology/approach: A turbulence-acoustic model solving the flow field in a hoistway and a numerical wind hoistway model of the ultra-high-speed elevator were established by using large eddy simulation (LES) and Curle acoustic theory. Findings: The characteristics of pulsating flow field and aerodynamic noise around ultra-high-speed elevator are analyzed. The asymmetric characteristics of the flow field could be observed using the turbulent kinetic energy and the instantaneous vortexes in the wind hoistway model. Vortex shedding, air flow separation and recombination around the car were the key factors for aerodynamic noise generation. The sound pressure level was approximately linear to the logarithm of car speed. The increase of car deflection angle in a certain range would reduce the peak frequency of wake noise and increase the sound pressure level (SPL) value. Originality/value: This paper provides important guidance for researches studying the aerodynamic noise in the hoistway and the technical personnel that look for the reduction measures, which greatly improves the shortcomings in the numerical simulation of the aerodynamic noise of the hoistway.

In this paper, for studying the influence of the randomness of structural parameters of high-speed elevator lifting system (HELS) caused by manufacturing error and installation error, a continuous time-varying model of HELS was constructed, considering the compensation rope mass and the tension of the tensioning system. The Galerkin weighted residual method is employed to transform the partial differential equation with infinite degrees of freedom (DOF) into the ordinary differential equation. The five-order polynomial is used to fit the actual operation state curve of elevator, and input as operation parameters. The precise integration method of time-varying model of HELS is proposed. The determination part and the random part response expression of the longitudinal dynamic response of HELS are derived by the random perturbation method. Using the precise integration method, the sensitivity of random parameters is determined by solving the random part response expression of time-varying model of HELS, and the digital characteristics of the acceleration response are analyzed. It is found that the line density of the hoisting wire rope has the maximum sensitivity on longitudinal vibration velocity response, displacement response and acceleration response, and the sensitivity of the elastic modulus of the wire rope is smallest.