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

doi:10.1007/s10483-016-2087-6

Applied Mathematics and Mechanics (English Edition) ›› 2016, Vol. 37 ›› Issue (6): 741-748.doi: https://doi.org/10.1007/s10483-016-2087-6

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

Shaopu YANG¹, Xueqian FANG¹, Jianchao ZHANG¹, Dujuan WANG²

1. School of Mechanical Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;
2. China Railway Engineering Equipment Group Co., Ltd., Zhengzhou 453000, China

Received:2015-10-20 Revised:2015-11-27 Online:2016-06-01 Published:2016-06-01
Contact: Xueqian FANG E-mail:stduxfang@yeah.net
Supported by:
Project supported by the National Natural Science Foundation of China (No. 11472179)

Abstract

Abstract:

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.

Key words: wire rope, dynamic behavior, bridge-erecting machine, equivalent “springdamper&rdquo, system

2010 MSC Number:

74H45

Shaopu YANG, Xueqian FANG, Jianchao ZHANG, Dujuan WANG. Dynamic behavior of bridge-erecting machine subjected to moving mass suspended by wire ropes. Applied Mathematics and Mechanics (English Edition), 2016, 37(6): 741-748.

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

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