Computer Modeling of Dynamic Processes of Passenger Elevators at Casual External Influence

Khazanovich, G.S.; Otrokov, A.V.; Aprishrin, D.S.

doi:10.1109/fareastcon.2018.8602877

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…В качестве альтернативы прямому использованию показателей надежности для определения требуемой периодичности ТО в настоящей работе принята гипотеза о взаимосвязи нормативных ресурсных показателей отдельных узлов и всей установки с вероятностными характеристиками режимов и условиями эксплуатации. Авторы интегрировали эту информацию с анализом экспериментальных данных и адекватных им результатов ИМ [3,4]. Такой подход позволил определить характеристики нагрузочных режимов и условий эксплуатации лифтов, а также разработать методы и программы ИМ 9 для их воспроизведения.…”

Section: рис 1 структурная схема аналитического решения задачи устано...unclassified

“…Для пассажирских лифтов устанавливаемая периодичность технического обслуживания (ТО) не зависит от условий и режимов эксплуатации. Она определяется нормативными документами 1,2 и руководствами по эксплуатации 3 , принимается одинаковой для всех лифтов и не зависит от этажности дома, плотности заселения, параметров лифтовой установки (грузоподъемность, скорость), а также текущего технического состояния объекта.…”

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“…-регулярные наблюдения -для эксплуатируемых машин [2]; -ИМ -для проектируемых лифтовых установок [3,4]. В зависимости от сочетания значений указанных случайных показателей изменяются темпы износа оборудования, частота и тяжесть отказов.…”

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Substantiation of Passenger Elevators Maintenance Intervals Based on Studies of Modes and Conditions of Their Operation

Apryshkin

Khazanovich

Otrokov

2022

jour

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Introduction. Maintenance is one of the factors of elevator systems safe operation. In regulatory documents, the influence of the loading mode of elevators on the frequency of maintenance is not taken into account and is assumed to be the same for objects operating in disparate conditions. This suggests the need to determine rational intervals between maintenance to ensure safe and economically feasible operation of the equipment in question. The work objective is to substantiate the required maintenance frequency of passenger elevators based on comprehensive assessments of their technical condition.Materials and Methods. The domestic and foreign experience of choosing the maintenance frequency of elevator units is considered. The paper evaluates the possibilities of substantiating the required maintenance intervals on the basis of established comprehensive assessments of technical condition, taking into account the conditions and operating modes. Since the problem has no direct analytical solution, an alternative approach is proposed. It is based on the hypothesis of the interrelation between the regulatory resource characteristics of assemblies and the modes and conditions of their operation. The authors obtained the necessary indicators through measurements in high-rise apartment buildings in Rostov-on-Don, experiments and adequate simulation modelling.Results. A structural and logical model has been developed to solve this problem. It consists of procedures that can be described in detail and clarified. A method for adjusting the maintenance frequency of elevators is proposed and tested. The standards of the system resource in terms of time and number of work cycles for the control time are summarized and tabulated. In this light, the gearbox, electric motor, brake, door drive and elevator ropes in 9-storey buildings are described at a cabin speed of ≤ 1 m/s. For example, the paper provides the calculated normative indicators:Kmcp норм — coefficient of net machine time (NMT);ncp норм — specific number of switching-on of the main drive and the doorAccording to the calculation results, Kmcp норм for the electric motor is 0.228; ncp норм for the brake is 1.065 per NMT minute. To assess the overall load level, the resulting technical condition of the elevator and its main components, a single generalized indicator is proposed — the load index WΣ. It is calculated as the sum of coefficients reflecting the relative level of load on the elevator assembly. It is established that as the resource is being depleted, while maintaining the value of time and power indicators, the estimated maintenance frequency will decrease. The recommended change threshold is 15–20 %.Discussion and Conclusion. The developed methodology for assessing the technical condition of the elevator unit allows us to develop a complex index by which we can judge the need to revise the regulatory intervals of the elevator unit assemblies. The proposed procedures are applicable to existing, installed and designed elevators. Simulation modeling in a specially developed computer program determines the main indicators of the technical condition of the power units of the elevator: the coefficient of net machine time, switching-on specific number, the power load and the share of the expired service life. Simulation modelling also takes into account the parameters of the building: population density and random external and internal influences. The method of adjusting the maintenance frequency allows you to quickly plan and optimize the costs of operating elevator equipment without losing the level of reliability and safety.

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Section: рис 1 структурная схема аналитического решения задачи устано...unclassified

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Substantiation of Passenger Elevators Maintenance Intervals Based on Studies of Modes and Conditions of Their Operation

Apryshkin

Khazanovich

Otrokov

2022

jour

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“…But the sliding characteristics of the wire rope are not considered. Khazanovich et al [17] established the dynamic equations for starting, steady-state motion, and braking phases of a system composed of traction machine, steel rope, carriage, and counterweights and calculated the equivalent load of the elevator power unit. Accordingly, a basis was provided to analyze the elevator electrical response, but no comparative analysis has yet been performed in this regard.…”

Section: Introductionmentioning

confidence: 99%

Experiment Research on Emergency Stop Vibrations of Key Components in the Friction Vertical Lifting System

Peng

et al. 2022

Shock and Vibration

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In order to analyze emergency stop vibration of the friction vertical lifting system under different loads, a loading experiment was carried out, and the longitudinal vibration characteristics of the carriage, frame, and steel rope were measured during the emergency braking process of an elevator. Accordingly, it is found that the load mass does not affect the peak deceleration value of the car frame and the wire rope during downwards emergency stop. Then, vertical vibration is explored using the time-varying vibration analysis theory. The obtained results show that when analyzing the vibration of objects on both sides of the traction wheel, the deceleration of the wire rope on both sides of the traction wheel are not equal, and the influence of the pressure change during the traction-wheel friction should be considered in calculations. This article may provide a reference to calculate the steel rope tension of the elevator and mine hoist.

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“…Zhu et al [ 10 ] explored the dynamic characteristics of hoist rope as well as the free vibration and forced vibration characteristics of the car. Khazanovich et al [ 11 ] established the dynamic equations of a system composed of traction machine, hoist rope, car, and counterweight under starting, steady-state motion, and braking conditions, and proposed a relation for calculating the equivalent load of the elevator power unit. Esteban et al [ 12 ] proposed a dynamic model for calculating the dynamic variation in acceleration of the elevator under normal operation, and compared the simulation results with the experimental results.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Vibration Monitoring Data of Flexible Suspension Lifting Structure Based on Time-Varying Theory

Peng

Yuan

et al. 2020

Sensors

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An elevator is a typical flexible lifting machine. In order to monitor the vibration of elevator structure, the vibration characteristics of an elevator with a traction ratio of 1:1 has been tested experimentally. Sensors were arranged on the platform frame, car roof, and hoist rope to test the vibrations of the elevator in both ascending and descending conditions. The transverse, longitudinal, and coupled transverse-longitudinal vibrations were compared and analyzed. Further, the short-time Fourier transform (STFT) method was used to examine the power spectral density (PSD) of the test results, and the main frequency distribution and influencing factors of the vibration of elevator components were investigated. The results revealed that the transverse and longitudinal vibrations of the platform frame were low-frequency vibrations, which was attributed to the elastic interaction between the platform frame and the car frame. The form and amplitude of longitudinal vibration of the car frame were basically consistent with those of the platform frame, but PSD of the transverse vibration had an obvious peak in the high-frequency region. The transverse and longitudinal vibration frequencies of the hoist rope were higher. Furthermore, the peak PSD value of transverse vibration of the hoist rope was 421 times larger than that of the car frame, so a small disturbance at the end of the rope could lead to a huge disturbance in the center of the rope. Overall, this study provides useful insights on designing an elevator monitoring sensor and relevant data processing.

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Computer Modeling of Dynamic Processes of Passenger Elevators at Casual External Influence

Cited by 4 publications

References 3 publications

Substantiation of Passenger Elevators Maintenance Intervals Based on Studies of Modes and Conditions of Their Operation

Substantiation of Passenger Elevators Maintenance Intervals Based on Studies of Modes and Conditions of Their Operation

Experiment Research on Emergency Stop Vibrations of Key Components in the Friction Vertical Lifting System

Analysis of Vibration Monitoring Data of Flexible Suspension Lifting Structure Based on Time-Varying Theory

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