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research-article

Slipping dynamics of slender-beam payloads during lay-down operations

[+] Author and Article Information
Shenghai Wang

Department of Marine Engineering, Dalian Maritime University, Dalian, China, 116026
shenghai_wang@outlook.com

Al Ferri

School of Mechanical Engineering, Georgia Tech, Atlanta, GA 30332-0405
al.ferri@me.gatech.edu

William Singhose

School of Mechanical Engineering, Georgia Tech, Atlanta, GA 30332-0405
singhose@gatech.edu

1Corresponding author.

ASME doi:10.1115/1.4039154 History: Received January 05, 2017; Revised December 14, 2017

Abstract

When laying down a long slender beam from a near-vertical orientation, to a horizontal position on a flat surface, the payload may slip and move suddenly in unintended and unpredictable ways. This occurs during crane operations when the movements of overhead trolley and lowering of the hoist cable are not properly coordinated. The payload's unintended sliding can potentially cause damage and injure people. This paper presents static and dynamic analysis of slender-beam payload lay-down operations, aiming to establish a structured method to predict the safe conditions for lay-down operations. Also, a new method to measure friction coefficient of surface-to-line contact is proposed. Laydown experiments are carried out to verify the theoretical predictions.

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