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1
Content available Stability assessment as a criterion of stabilization of the movement trajectory of mobile crane working elements
Kacalak W., Budniak Z., Majewski M.
International Journal of Applied Mechanics and Engineering
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2018
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Vol. 23, no. 1
65--77
EN
The article presents a stability assessment method of the mobile crane handling system based on the safety indicator values that were accepted as the trajectory optimization criterion. With the use of the mathematical model built and the model built in the integrated CAD/CAE environment, analyses were conducted of the displacements of the mass centre of the crane system, reactions of the outrigger system, stabilizing and overturning torques that act on the crane as well as the safety indicator values for the given movement trajectories of the crane working elements.
2
Content available Crane stability assessment method in the operating cycle
Kacalak W., Budniak Z., Majewski M.
Transport Problems
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2017
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T. 12, z. 4
141--151
EN
The article presents stability assessment of the mobile crane handling system based on the developed method with the use of the mathematical model built and the model built in the integrated CAD/CAE environment. The model proposed consists of the main crane assemblies coupled together: the truck with outrigger system and the base, the slewing column, the inner and outer arms, the six-member telescopic boom, the hook with lifting sling and the transported load. Analyses were conducted of the displacements of the mass centre of the crane system, reactions of the outrigger system, stabilizing and overturning torques that act on the crane as well as the safety indicator values for the given movement trajectories of the crane working elements.
3
Content available Lifting capacity enhancement of a crawler crane by improving stability
Shaikh A. A., Kumar D D.
Journal of Theoretical and Applied Mechanics
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2016
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Vol. 54 nr 1
219--227
EN
The lifting capacity of a crawler crane is limited by its stability and structural strength. This paper analyzes the stability factor by calculating tipping loads at various load radii for a particular boom length. It shows that the tipping load decreases with an increase in the load radius. A new structural frame is proposed to extend out the superstructure counterweight of the crane. With such a proposed arrangement, it is shown that the lifting capacity of the crane, limited by stability, increases. Static structural analysis of the proposed structural frame is performed using ANSYS workbench software.
4
Content available Asymmetric Lifting Capabilities for Different Container Dimensions
Lee T. H., Cheng T. S.
International Journal of Occupational Safety and Ergonomics
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2011
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Vol. 17, No. 2
187--193
EN
This study recruited 14 young male participants to examine human 4-h maximum acceptable weight of lifting (MAWL) and maximum weight of lifting (MWL) for different modes of asymmetric lifting and containers. The results showed that asymmetric lifting with trunk rotation decreased MAWL and MWL by 9.1 and 17.3%, respectively, and asymmetric lifting with body turn decreased MAWL and MWL by 6.1%, when compared with the symmetric lifting. The decreasing effects of container width and MAWL and MWL were greater than those of container length. Participants selected MAWL of ~33–37% of their MWL capability.
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