Time-varying characteristics of guide roller-rail contact stiffness of super high-speed elevator under aerodynamic load

Qin, Guangjiu; Yang, Zhe

doi:10.1007/s40430-021-03190-3

Cited by 8 publications

(4 citation statements)

References 17 publications

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“…The wheel-rail contact stiffness of the elevator changed under the action of the pneumatic load induced by the car motion, and its change trend was the same as the change trend for the horizontal pneumatic force. (Qin and Yang, 2021) Therefore, it was necessary to optimize the operation for the random displacement excitation of the rail obtained from the car body's running speed and the horizontal pneumatic force of the shaft. Based on the approximate expression of the roller elastic deformation (Puttock and Thwaite, 1969) as shown in equation ( 4), the car's running speed and the horizontal aerodynamic force of the shaft fluid in each time step were unquantified according to the idea of discretization.…”

Section: Numerical Fluid Modelmentioning

confidence: 99%

Analysis of the horizontal vibration response under gas–solid coupling throughout the entire high-speed elevator operating process

Shi

Zhang

et al. 2022

Journal of Vibration and Control

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High-speed elevator cars affected by external excitations exhibit complex horizontal vibration responses during their entire operating processes. To accurately explore the horizontal vibration response of a car and the response differences between the operating processes, a gas–solid coupling model for the entire high-speed elevator operating process was developed based on the finite volume method, Lagrange’s theorem, and the external excitations obtained from dynamic mesh technology and the time-variant guideway excitation simulation method. The differences in the car’s horizontal vibration acceleration and the effect of the fluid load disturbance during different high-speed elevator operating processes were analyzed by considering the different operating characteristics of the car during its acceleration–uniform speed–deceleration process. The feasibility of the model and modeling method were verified by testing an actual 7 m/s high-speed elevator. The results showed that the horizontal vibration acceleration of the car reached its maximum value during the uniform speed process, and the shaft fluid pressure load had the most significant effect on the horizontal vibration response of the car during the deceleration process.

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Section: Numerical Fluid Modelmentioning

confidence: 99%

Analysis of the horizontal vibration response under gas–solid coupling throughout the entire high-speed elevator operating process

Shi

Zhang

et al. 2022

Journal of Vibration and Control

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“…Wang et al [28] developed a dynamic coupling model for double-pantograph-catenary systems, validated with field tests, revealing the impact of speed, span, and wind on contact force fluctuations. Qin and Yang [29] created a 17-DOF model to analyze the time-varying characteristics of guide roller-rail contact stiffness in super high-speed elevators, showing significant influence on horizontal vibration. Song et al [30] evaluated crosswind effects on pantograph-catenary interaction, finding acceptable performance at 20 m/s crosswind, but safety issues at 30 m/s, emphasizing the importance of aerodynamic forces.…”

Section: Introductionmentioning

confidence: 99%

Flow-Induced Vibration Analysis by Simulating a High-Speed Train Pantograph

Wang,

Sun,

Liu

et al. 2024

Applied Sciences

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This paper investigates the aerodynamic behavior and dynamic characteristics of high-speed train pantographs under various operating conditions using advanced aerodynamic simulations and dynamic analyses. The simulations show significant fluctuations in aerodynamic loads during tunnel entry and exit, heavily influenced by train speed and pantograph position (raised/lowered). Modal simulations reveal distinct low-frequency vibrations in pantographs, significantly impacted by external aerodynamic forces. Importantly, the lowered position exposes the pantograph to upward aerodynamic forces, leading to increased bow-net contact force and off-line rate, ultimately compromising current collection stability. Both maximum contact force and off-line rate further increase with higher train speeds. To improve pantograph design, the paper proposes adjustments to the airbag’s equivalent spring stiffness and the bow head’s density. These modifications aim to mitigate contact force and enhance the stability and reliability of pantographs at high speeds. This research offers theoretical and practical insights, aiding in the design, optimization, and refinement of future pantograph systems.

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“…The aerodynamic loads also fall under the study of the piston effect, and the relevant scholars began to focus on the aerodynamic characteristics of the single car (without counterweight) of the ultrahigh-speed elevator and achieved certain research results in this field. Yang et al 11,12 established a full-size model of the elevator and hoistway using the CFD three-dimensional numerical simulation method and analyzed the effects of different running speeds and the distance between the lateral outer wall and hoistway wall on the car's aerodynamic characteristics. Jing et al 13 established a universal multiparameter model of the ultra-high-speed elevator, conducted a threedimensional numerical simulation of incompressible fluid in the hoistway, and analyzed the influence of different hoistway structures and vent parameters on the aerodynamic force and hoistway pressure.…”

Section: Introductionmentioning

confidence: 99%

Study on the aerodynamic characteristics and ventilation effects of ultra-high-speed elevator car-counterweight system under the influence of multiple parameters

Zeng,

He,

Zhang

et al. 2024

Physics of Fluids

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When the ultra-high-speed elevator car-counterweight system runs opposite each other, significant piston effects are caused, seriously affecting the elevator operation's stability. In order to explore the aerodynamic characteristics of the whole operation process of a car-counterweight system under multi-parameters, this study first establishes a three-dimensional transient model of the car-counterweight system and a multi-region dynamic layering numerical simulation method based on this model is proposed. Then, the actual elevator experiment validates the correctness of the model and the method. Finally, the influence rules of key parameters on the car's aerodynamic characteristics and ventilation effect are analyzed, and the car's aerodynamic characteristics at intersection time are analyzed emphatically. The results show that with the increase in the blocking ratio, the pressure drag and viscous drag have similar change trends at each stage, but the influence of pressure drag is more significant. The air displacement ratio increases by 34.1%, 75.8%, and 117.3%, respectively. With the increase in the hoistway height, the air displacement ratio decreases by 0.9%, 2.4%, and 2.9%, respectively. The spacing significantly affects the car's aerodynamic characteristics at the intersection time. The drag peak increases by 6.8%, 13.6%, and 20.5% and the lift peak by 21.2%, 47.8%, and 82.5%, respectively.

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Time-varying characteristics of guide roller-rail contact stiffness of super high-speed elevator under aerodynamic load

Cited by 8 publications

References 17 publications

Analysis of the horizontal vibration response under gas–solid coupling throughout the entire high-speed elevator operating process

Analysis of the horizontal vibration response under gas–solid coupling throughout the entire high-speed elevator operating process

Flow-Induced Vibration Analysis by Simulating a High-Speed Train Pantograph

Study on the aerodynamic characteristics and ventilation effects of ultra-high-speed elevator car-counterweight system under the influence of multiple parameters

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