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Date of Publication:2015-01-01

Journal:工程力学

Affiliation of Author(s):海洋科学与技术学院

Volume:32

Issue:7

Page Number:210-218

ISSN No.:1000-4750

Abstract:A majority of lifting machineries contain the mechanisms for positioning
   heavy weights. These additional mechanisms constrain the locations of
   boom structures after deformation under loads, which can be considered
   as generalized applied forces related to structure and mechanism
   displacements. Boom structures are divided into several substructures
   along the longitudinal direction, and internal displacements of each
   substructure are reduced to the displacements of its left and right
   ends. Based on the Co-rotational method, an embedded coordinate system
   is defined, and a set of generalized nodal internal forces for
   substructure elements are formulated. Taking main and sub-boom
   structures of crawler cranes for an example and considering that the
   boom structures are constrained and controlled by derricking mechanisms,
   the additional nodal external forces and their derivatives on the
   substructure element nodes are obtained. At last, a numerical example of
   sub-boom working conditions for a kind of crawler crane is presented, in
   which the displacements of boom structures and mechanisms under
   different load conditions are obtained. The numerical example proves the
   validity and rationality of the analytical procedure.

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