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Research Papers

Experimental Investigation of Friction and Slip at the Traction Interface of Rope and Sheave

[+] Author and Article Information
Xiaolong Ma, Yalu Pan

School of Mechanical Engineering,
Shanghai Jiao Tong University,
800 Dong-chuan Road,
Shanghai 200240, China

Xi Shi

School of Mechanical Engineering,
Shanghai Jiao Tong University,
800 Dong-chuan Road,
Shanghai 200240, China
e-mail: xishi@sjtu.edu.cn

1Corresponding author.

Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received October 1, 2017; final manuscript received October 19, 2017; published online November 20, 2017. Editor: Yonggang Huang.

J. Appl. Mech 85(1), 011006 (Nov 20, 2017) (8 pages) Paper No: JAM-17-1548; doi: 10.1115/1.4038328 History: Received October 01, 2017; Revised October 19, 2017

In this paper, an exclusive testing rig was built to experimentally investigate the friction and slip at elevator traction interface under different traction conditions. The experimental results indicated that slipping occurs at both ends of contact arc first and then expands to the middle region gradually until the full slip along the sheave occurs. In addition, the full slip occurs earlier under lower rope pretension. Meanwhile, by setting similar boundary and loading conditions as in the experiments, the finite element analysis was performed. The simulation results agree with the experiments very well but reveal more details about traction behavior.

Copyright © 2018 by ASME
Topics: Friction , Pulleys , Ropes , Traction
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References

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Figures

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Fig. 1

Geometry and notation for contact forces at rope–sheave interaction

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Fig. 2

Schematic of the whole test rig

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Fig. 3

Assembly of traction system: 1—rope, 2—traction sheave, 3—fork frame, and 4—rope fixture

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Fig. 4

Structure of slippage measuring equipment

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Fig. 5

Calculation of slippage (a) mark points and (b) geometrical relationship of mark points

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Fig. 6

The mesh model of assemble

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Fig. 7

Image sequences of mark points in different regions: (a) head region, (b) mid region, and (c) end region

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Fig. 8

Experimental observation of slippage development in different regions

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Fig. 9

Loading steps and boundary conditions

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Fig. 10

Numerical prediction of slippage development in three different regions

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Fig. 11

Instantaneous rope-end force behavior under two different preloads

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Fig. 12

Slippage development of head region under different pretension forces

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Fig. 13

Instantaneous speeds of drive motor and loading motor with a preload of (a) 3500 N and (b) 1800 N

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Fig. 14

Rope-end forces under two different preloads

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Fig. 15

Rope-end force with two different preload in two different regions

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