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Dynamic behavior of bridge-erecting machine subjected to moving mass suspended by wire ropes

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Applied Mathematics and Mechanics(English Edition) 2016年第6期37卷 741-748页

作者： Shaopu YANG Xueqian FANG Jianchao ZHANG Dujuan WANG School of Mechanical Engineering Shijiazhuang Tiedao University China Railway Engineering Equipment Group Co. Ltd.

The dynamic behavior of a bridge-erecting machine, carrying a moving mass suspended by a wire rope, is investigated. The bridge-erecting machine is modelled by a simply supported uniform beam, and a massless equivalent ＂spring-damper＂ system with an effective spring constant and an effective damping coefficient is used to model the moving mass suspended by the wire rope. The suddenly applied load is represented by a unitary Dirac Delta function. With the expansion method, a simple closed-form solution for the equation of motion with the replaced spring-damper-mass system is formulated. The characters of the rope are included in the derivation of the differential equation of motion for the system. The numerical examples show that the effects of the damping coefficient and the spring constant of the rope on the deflection have significant variations with the loading frequency. The effects of the damping coefficient and the spring constant under different beam lengths are also examined. The obtained results validate the presented approach, and provide significant references in the design process of bridgeerecting machines.

关键词： bridge-erecting machine wire rope dynamic behavior equivalent "spring-damper" system

Distribution of wire deformation within strands of wire ropes

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Journal of China University of Mining and Technology 2008年第3期18卷 475-478页

作者： MA Jun GE Shi-rong ZHANG De-kun Mechanical and Electrical Engineering Institute Xuzhou Normal University Xuzhou Jiangsu 221116 China School of Materials Science and Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221116 China

Using ANSYS software, we developed a modeling program for several kinds of wire ropes with metal cores and built a geometric model for the 6×19 IWS wire rope. Through proper grid partitioning, a finite element model for calculating the deforma-tion of wire rope was obtained. Completely constraining one end of the wire rope and applying an axial force to the other end, we established the boundary conditions for solving the model. In addition, we numerically simulated the stress and deformation of the wire, obtaining the deformation distribution of each wire within the wire rope under different laying directions. At the end, a tensile test of the 6×19 IWS wire rope was carried out and the results of simulation and experiment compared.

关键词： wire rope model deformation finite element

Theoretical and Experimental Study on Tension–Torsion Coupling Vibration for Time-Varying Elevator Traction System

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Acta Mechanica Solida Sinica 2023年第6期36卷 899-913页

作者： Peng Xu Qifeng Peng Fusong Jin Jianghong Xue Hong Yuan MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction EngineeringJinan UniversityGuangzhou 51063China University of Health and Rehabilitation Sciences Qingdao 266071China School of Architectural Engineering Guangzhou Institute of Science and TechnologyGuangzhou 510540China Qingdao Xinghua Intelligent Equipment Co. Ltd.Qingdao 266114China

Elevators used in ultra-high buildings are prone to vibrating due to their ultra-long traction ropes,which significantly affects the comfort and safety of high-speed ***,vibration of the elevator has always been a topic of research *** paper presents a theoretical model for analyzing the tension–torsion coupling vibration of the time-varying elevator traction *** constitutive relations with the tension–torsion coupling effect of the wire rope are reduced by analyzing the deformation mechanism of the spiral winding wire *** on Hamilton’s principle,the equations of motion and corresponding boundary conditions for the tension–torsion coupling vibration of the elevator traction system are *** Galerkin method is employed to account for the influence of nonlinear boundary conditions and to transform the equations of motion into discrete ones with variable coefficients of time,which are solved using the Newmark-β*** accuracy of the proposed model is justified by the good agreement between theoretical predictions and experimental results,following which,the influence of the operation status and structural parameters of the elevator traction system on its vibration performance is discussed in detail.

关键词： Elevator traction system wire rope Tension–torsion vibration Time-varying

Feature Extraction and Quantitative Inspection for Broken wires in wire ropes Based B-Wavelet and WNN

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维普期刊数据库

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Feature Extraction and Quantitative Inspection for Broken Wi...

Research on Novel Linear Driving and Metamorphic Characteristics for Slider-actuated Parallel (Hybrid) Mechanism

第二届仪器科学与技术国际学术研讨会

作者： Zhang Donglai Xu Dianguo Dept. of Electronic Engineering Harbin Institute of Technology China

＜正＞ A data compression （at a ration of 1:4） method based on linear B-wavelet decomposition is proposed for wire rope signals without professional coding. This method saves the natural information of signals and reduces the high frequency noise of signals. WNN has been selected for the quantitative inspection of broken wires. WNN models and weights study algorithms suitable for quantitative inspection of broken wires are discussed as well. The input layer of WNN is the inner product of feature vector and wavelet using wavelet nonlinearity. The experiment results show that the WNN model displays a much higher level of generalization, shorter compution time and accurate inspection in comparison with BP-Network.

关键词： Data compression Feature extraction B-Wavelet Wavelet neural network(WNN) wire rope broken wire NDT

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International Journal of Plant Engineering and Management 2013年第2期18卷 87-95页

作者： DENG Jia-ming QIN Xian SHEN Hui-ping ZHAO Hai-bing LI Ju YANG Ting-li College of Mechanical Engineer Changzhou University

This paper presents a novel one-axis linear-drive control system, in which wire rope is wound orderly around drum by servo motor drive and drays the working slider for a long linear reciprocating motion. PKM with this control system is metamorphic and can achieve great feed forces, accelerations and transverse speeds, high accuracy and low cost. The metamorphic characteristics are studied, including the metamorphic condition, con- tents, process as well as procedures. The kinematics computation model is established and analyzed.

关键词： parallel kinematic mechanism ( PKM ) hybrid kinematic mechanism ( HKM ) linear-drive control system wire rope