Prediction Model and Experimental Study on Braking Distance under Emergency Braking with Heavy Load of Escalator

Li, Zhongxing; Xu, Peng; Peng, Qifeng; Huang, Guojian; Liu, Yingjie

doi:10.1155/2020/7141237

Cited by 6 publications

(6 citation statements)

References 18 publications

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“…Equation (2) shows the total kinetic energy of the system represented by Fig. 1, as the sum of the kinetic energies of the suspension systems, right and left, and the kinetic energy of the elevator cabin [12].…”

Section: Mathematical Modelmentioning

confidence: 99%

“…In [11][12][13][14][15][16], studies are presented that revealed that vibration during the elevator emergency braking process directly affects the performance of the elevator traction system, thus affecting the safety, reliability, and comfort of passengers. In [17], results are presented that demonstrate that the vertical vibrations of the elevator traction system are maximized during the braking operation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Active Control System Applied to Vibration Level Control in High-Speed Elevators

Gonçalves

Balthazar

Oliveira

et al. 2022

IJRCS

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This work presents an active control system applied to vibration level reduction in high-performance vertical transport, aiming at improving the passengers’ comfort in high-speed elevators. The control system design includes the use of a Proportional Integral Derivative (PID) control. Three strategies were proposed in order to achieve a 90% reduction in the vibration amplitudes: (I) the consecutive reduction of 90% of the displacements, (II) the consecutive reduction of 90% of the velocity, and (III) the consecutive reduction of 90% of the acceleration. The presentation of these three proposals allows their application for the use of different sensors. The performance of each strategy was evaluated through mathematical modeling and numerical simulations of a vertical transport with 4 degrees of freedom, submitted to excitations arising from rail deformations. Vibration and comfort levels in the cabin were numerically analyzed, taking into account ISO 2631 and BS 6841 standards for elevator lateral acceleration level and comfort level felt by passengers. Numerical simulations showed that the force required to reduce the vibration levels is practically the same for the three proposed strategies. However, strategy (III) – the successive reduction of 90% of acceleration – proved to be more efficient at improving passengers’ comfort level when compared to the other two strategies.

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Section: Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Active Control System Applied to Vibration Level Control in High-Speed Elevators

Gonçalves

Balthazar

Oliveira

et al. 2022

IJRCS

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“…References [5][6][7][8][9] studied the braking distance of escalators. Jiang et al 5 designed a wireless monitoring system,which can replace the backward manual measurement method for braking distance.…”

Section: State-of-the-art Researchmentioning

confidence: 99%

“…Liu 8 analyzed the calculation of the escalator braking distance by its established calculation formulas, which can provide theoretical basis for reference. Li et al 9 studied the relationship between the braking distance and the load of escalator, realized the prediction of the braking distance with little load. Reference [10][11][12][13][14] studied the braking performance.…”

Section: State-of-the-art Researchmentioning

confidence: 99%

Research on measuring device and quantifiable risk assessment method based on FMEA of escalator brake

Wang

Feng

et al. 2021

Advances in Mechanical Engineering

Self Cite

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To improve the accuracy of braking distance measurement and reduce the impact of human factors on brake risk assessment of escalators, a non-contact braking distance measuring device based on infrared ranging principle is designed. Futher, a quantifiable risk assessment method of brake based on failure mode and effects analysis (FMEA) is propose in this paper. Characteristics and trends of distance changes during emergency braking process of the escalator are theoretically analyzed. To extract, process, and recognize the distance change signals, and finally to realize accurate measurement of the braking distance, a high-speed infrared distance measurement technology is used. Influencing factors of the escalator brake performance are studied. The risk analysis method based on FMEA is used to analyze its failure mode, failure mechanism, and consequences of the failure. A risk index assessment system is constructed and quantified. The test results show that the measurement error of the device designed is 1.6%, which is 1/6 of the traditional measurement method. The repeated measurement error of the device is 1.4%, which is 1/7 of the traditional measurement method. Application results show that the quantifiable risk assessment method quantifies and assigns the risk level according to the weight, which effectively avoids the inconsistent results caused by human bias. The evaluation results are more scientific and reliable.

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“…Modern hardware for information processing and control solution implementation is considered in 15 – 17 . These studies focused on tracking moving objects, posturing people, and predicting emergency braking on escalators.…”

Section: Introductionmentioning

confidence: 99%

Intelligent escalator passenger safety management

Osipov

Zhukova

Subbotin

et al. 2022

Sci Rep

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This article addresses an approach to intelligent safety control of passengers on escalators. The aim is to improve the accuracy of detecting threatening situations on escalators in the subway to make decisions to prevent threats and eliminate the consequences. The novelty of the approach lies in the complex processing of information from three types of sources (video, audio, sensors) using machine learning methods and recurrent neural networks with controlled elements. The conditions and indicators of safety assurance efficiency are clarified. New methods and algorithms for managing the safety of passengers on escalators are proposed. The architecture of a promising safety software system is developed, and implementation of its components for cloud and fog computing environments is provided. Modeling results confirm the capabilities and advantages of the proposed technological solutions for enhancing the safety of escalator passengers, efficiency of control decision making, and system usability. Due to the proposed solutions, it has become possible to increase the speed of identifying situations 3.5 times and increase the accuracy of their determination by 26%. The efficiency of decision making has increased by almost 30%.

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Prediction Model and Experimental Study on Braking Distance under Emergency Braking with Heavy Load of Escalator

Cited by 6 publications

References 18 publications

Active Control System Applied to Vibration Level Control in High-Speed Elevators

Active Control System Applied to Vibration Level Control in High-Speed Elevators

Research on measuring device and quantifiable risk assessment method based on FMEA of escalator brake

Intelligent escalator passenger safety management

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