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RESEARCH PAPERS

Stability Analysis of Lifting Rigs—Part 1: Necessary and Sufficient Conditions

[+] Author and Article Information
R. W. Longman, F. Freudenstein

Columbia University, New York, N. Y.

J. Eng. Ind 97(2), 532-536 (May 01, 1975) (5 pages) doi:10.1115/1.3438616 History: Received June 04, 1974; Online July 15, 2010

Abstract

When heavy equipment is moved by cranes or derricks—for example, in the course of manufacturing, assembly, or installation—the rigging or hitch used should be stable, i.e., it should not dump the load in the course of its motion. A general criterion is derived which is necessary and sufficient for Liapunov stability or asymptotic stability of a hitch. The relationship between asymptotic stability and stability under persistent disturbances is discussed, and an analytical expression for the system margin of stability is obtained.

Copyright © 1975 by ASME
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