Aerodynamic Shape Optimization Design of the Air Rectification Cover for Super High-Speed Elevator

Zhang, Ruijun; Zhang, Hao; Yang, Zhe

doi:10.1142/s0219455423500025

Cited by 5 publications

(1 citation statement)

References 16 publications

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“…This paper refers to the work of Zhang et al [24] ,Figure 3 shows the parameterization modeling of the guide vanes is done using the two-dimensional elliptic curve method, and six design parameters h1, h2, t1, t2, e, and d shown in Table 1 are selected to define the shape of the guide vanes. The resulting three-dimensional model of the elevator guide vanes is shown in Figure 4.…”

Section: Parametric Modeling Of Flow Guide Devicementioning

confidence: 99%

Multi-objective optimization design of high-speed elevator car based on aerodynamic characteristic surrogate model

Su,

Li,

Jiang

et al. 2024

Fourth International Conference on Mechanical Engineering, Intelligent Manufacturing, and Automation Technology (MEMAT 2023)

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With the increase of elevator operating speed, it is greatly affected by air disturbance, which leads to the increase of elevator cost and energy consumption, and has a huge impact on the safety, reliability and comfort of elevator operation. To improve the aerodynamic characteristics of the cabin flow field, this paper parameterizes the flow guide hoods with a structure similar to an ellipse, selecting eight design parameters. Taking the aerodynamic drag coefficient and the yawing moment coefficient as the optimization objectives, four surrogate models were constructed by using the optimal Latin hypercube design sample points and the prediction accuracy was compared. Finally, the EBF surrogate model with higher fitting accuracy was selected, and combined with the NSGA-II optimization algorithm to carry out multi-objective optimization of the flow guide hood, obtaining a series of Pareto solutions, and finally comparing and analyzing the aerodynamic performance of the flow guide hood before and after optimization. Finally, on the basis of the optimized flow guide hood, the aerodynamic characteristics of the cabin under actual operating conditions were analyzed. The results show that the installation of the flow guide hood can reduce the drag coefficient of the cabin; within a certain range, increasing the total height of the flow guide hood, the vertex offset and the inertia of the flow guide hood in the X direction can improve the aerodynamic performance of the ultra-high speed elevator system. The running scenarios such as start acceleration, smooth running, deceleration and stop will affect the aerodynamic performance of the cabin, and this study provides a reference for the optimization design of the flow guide hood and the operating conditions of the elevator.

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Section: Parametric Modeling Of Flow Guide Devicementioning

confidence: 99%

Multi-objective optimization design of high-speed elevator car based on aerodynamic characteristic surrogate model

Su,

Li,

Jiang

et al. 2024

Fourth International Conference on Mechanical Engineering, Intelligent Manufacturing, and Automation Technology (MEMAT 2023)

View full text Add to dashboard Cite

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Analysis of the aerodynamic characteristics of the entire operation process of an ultra-high-speed elevator under the influence of high blockage ratio, hoistway, and car height parameters

2023

Physics of Fluids

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Ultra-high-speed elevators are affected by various factors during operation, resulting in complex airflow disturbances and significant piston effects. To explore the aerodynamic characteristics and ventilation effects of the car at different stages of operation under multiple parameters, this paper first establishes a multi-parameter numerical model for the elevator system and verifies the numerical model through elevator experiments, and then analyzed the general variation characteristics of the pneumatic load during the car's acceleration, constant speed, and deceleration phases. On this basis, the influence of blockage ratio, hoistway and car height, and operating acceleration on multiple types of aerodynamic loads and hoistway ventilation was studied, with a special analysis of the viscous drag and pressure drag of the car. The results show that increasing the blockage ratio significantly increases the ventilation of the hoistway, with an increase in 1 and 0.7 factors in the acceleration and constant velocity stages, respectively. In the deceleration stage, the drag changes the most, with an increase in 3.1 factors, which hinders the ventilation of the hoistway. Meanwhile, the average lateral lift increased by 0.6 factors and the fluctuation increased, exacerbating the lateral vibration of the car. Viscous drag and pressure drag exhibit similar trends at each stage, but pressure drag is much higher than viscous drag. The height of the hoistway has a significant impact on the total drag of the car by increasing the pressure drag. In contrast, car height has the most significant effect on lateral lift and viscous drag.

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Research on the unsteady flow field and aerodynamic noise characteristics in the circular space of ultra-high-speed elevators

He,

Yang,

Zhang

et al. 2024

Physics of Fluids

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Due to the non-streamlined blunt body shape of the elevator car, intense aerodynamic loads and noise are generated in the annular space when the elevator operates at high speed in a narrow hoistway. This article uses large-eddy simulation and Curle acoustic theory to establish a numerical model of the wellbore flow field under different guiding shapes of the elevator car. First, the mechanism of action between the flow guide shape, vortex characteristics, and aerodynamic load was studied, and the influence of operating speed on aerodynamic load under different flow guide shapes was analyzed. Second, the distribution and spectral characteristics of noise in the annular space under different flow guide shapes were studied from the near field and far field scales. Finally, it can be concluded that increasing the guide surface can significantly reduce the pressure difference between the upper and lower parts of the car, weakening the separation of the tail airflow. The number of guide surfaces, installation position, and vertex offset significantly impact drag and lateral force, with the optimal reduction of 34.65% and 57.6%, respectively. The maximum sound source intensity of near-field noise is mainly concentrated at the arc transition in the upper part of the annular space, and the frequency is mainly concentrated in the range of 500–1000 Hz. The sound pressure level is linearly related to the logarithm of the longitudinal distance, and the noise attenuation speed becomes faster with the increase in the number of guiding surfaces.

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Aerodynamic Shape Optimization Design of the Air Rectification Cover for Super High-Speed Elevator

Cited by 5 publications

References 16 publications

Multi-objective optimization design of high-speed elevator car based on aerodynamic characteristic surrogate model

Multi-objective optimization design of high-speed elevator car based on aerodynamic characteristic surrogate model

Analysis of the aerodynamic characteristics of the entire operation process of an ultra-high-speed elevator under the influence of high blockage ratio, hoistway, and car height parameters

Research on the unsteady flow field and aerodynamic noise characteristics in the circular space of ultra-high-speed elevators

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