A Vibration-Related Design Parameter Optimization Method for High-Speed Elevator Horizontal Vibration Reduction

Aiming at the inconsistency between the vibration of the car and the car frame in the actual operation of a high-speed elevator and the horizontal vibration caused by the roughness excitation of the guide rail, this study designs a gas–liquid active guide shoe and establishes a horizontal vibration model of the 8-DOF high-speed elevator car system separated from the car and the car frame. Then, the correctness of the model is verified by experiments. Based on this, a fuzzy neural network intelligent vibration reduction controller based on the Mamdani model is designed and simulated by MATLAB. The results show that the root mean square value, mean value, and maximum value of vibration acceleration are reduced by more than 55% after using the fuzzy neural network control method, and the suppression effect is better than that of BP neural network control. Therefore, the intelligent vibration absorption controller designed by this research institute can effectively suppress the horizontal vibration of high-speed elevators.

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“…The determination coefficient R 2 is used to test the accuracy of the model. Its calculation equation [28,29] is:…”

Section: Model Goodness Of Fitmentioning

confidence: 99%

Intelligent control of horizontal vibration of high-speed elevator based on gas–liquid active guide shoes

Zhang

Cao

et al. 2021

Mechanics & Industry

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“…Under external excitations, the movement of the system inevitably produces vibrations. These external excitations include the traction force provided by the traction machine, the braking force produced by the brake, the impact force caused by the irregularity of the guide rail, and the air resistance force generated during the operation [ 13 , 14 , 15 ]. When the elevator structure is considered as a unified dynamic system, its physical characteristics mainly include mass, stiffness, and damping.…”

Section: Vibration Characteristics Of Traction Systemmentioning

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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“…The acceleration monitoring aiming at mechanical equipment vibration state is the most important means of predictive maintenance. By which, many faults including train engine failure, [1] elevator out of control, [2] lathe wear, [3] and so on [4] can be premonitored. At present, there are various acceleration sensors on the market.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Levitation Type Double Helix Self‐Powered Acceleration Sensor Based on ZnO‐RTV Film

Han

et al. 2021

Adv Materials Technologies

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In recent years, TENG has been greatly developed due to its low cost and simple production method. [8] After many scholars' research, a variety of new self-powered sensors have been developed based on TENG. [9] For example, auditory sensor, [10] gas sensor, [11] tactile sensor, [12] acceleration sensor, [13] angle sensor, [14] mechanical sensor, [15] and so on. Dai, Wang, Yi, Jiang, Li, and You [16] developed an acceleration sensor for testing the external impact force, the sensor has a large range (1.76 × 10 5 m s −2 ), but its sensitivity is low (17.64 mv (m s −2 ) −1 ). Pang, Li, Chen, Han, Zhang, and Wang [17] used polytetrafluoroethylene (PTFE) and aluminum electrodes to design a selfpowered acceleration sensor, the sensor has excellent stability, but its application is relatively single, and it is only suitable for detecting mechanical vibration. Xiang, Liu, Hao, Wang, Che, and Zhou [18] designed a flexible acceleration sensor, the sensor has high impact resistance, but its energy harvesting performance is low. The maximum open-circuit voltage (V oc ) of this sensor is only 8 mV. In addition, some self-powered acceleration sensors are relatively large in size and not suitable for installation or carrying, which limits the development of TENG-based sensors.To this end, a magnetic levitation type double helix self-powered acceleration sensor (MDHAS) is designed. The sensor's frame is composed of two double helix bases and two neodymium iron boron permanent magnets, forming a magnetic suspension double helix structure. This structure can amplify weak vibration signals, making the sensor more sensitive to external vibrations. The room temperature vulcanized silicone rubber (RTV) film doped with a certain proportion of ZnO and conductive tape is chosen as the friction material. The electrical performance of TENG can be improved by doping ZnO, thereby improving the performance of the sensor. The traditional acceleration sensor is composed of masses, dampers, elastic components, sensitive components, and adjustment circuits. In this design, the large magnet at the top of the double helix is used as the mass. The elastic force of the double helix structure and the repulsive force between the magnets act as a damper and an elastic element at the same time. The ZnO-RTV film and the conductive tape are used as sensitive components, and the output of TENG can be used to characterize acceleration. The MDHAS can not only measure the vertical vibration Traditional accelerometers rely on batteries to provide energy, and the massive use of batteries caused great pressure on the natural environment. In this paper, a self-powered acceleration sensor is designed. To more easily harvest weak vibration signals and effectively improve the sensitivity, this sensor is built on a magnetic levitation type double helix structure and ZnO-doped triboelectric film. Experiments indicated that the open-circuit voltage and short circuit current of the triboelectric nanogenerator (TENG) doped with ZnO are increased by 2.51 times and 2.07 ti...

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A Vibration-Related Design Parameter Optimization Method for High-Speed Elevator Horizontal Vibration Reduction

Cited by 25 publications

References 41 publications

Intelligent control of horizontal vibration of high-speed elevator based on gas–liquid active guide shoes

Intelligent control of horizontal vibration of high-speed elevator based on gas–liquid active guide shoes

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

Magnetic Levitation Type Double Helix Self‐Powered Acceleration Sensor Based on ZnO‐RTV Film

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