"U.S. Army members undergo high biomechanical stresses, when performing tough manual material handling (MMH) tasks such as the assembly of a Medium Girder Bridge (MGB). High biomechanical stresses often lead to various musculoskeletal disorders in the people undertaking these tasks. The bridge components are extremely heavy and are designed to be carried using simple tools not manually.
A study was done by Kotian and Davis applying in 2005 applying Human Factors Engineering and Mechanical Engineering methodologies to MGBs Mechanical assists were designed to reduce injury caused by manual material handling of bridge components. The approach for the current research involved phases of Finite Element Analysis (FEA) on most critical parts of the crane followed by fabrication of a crane based on the outcome of the FEA results.
This thesis research involved design calculations, testing of each and every component of the crane using FEA analysis, and optimizing the design wherever needed. For this, the most critical structural areas were identified, and FEA analysis was done on those components. The results revealed that the design was safe with an overall factor of safety above 5, except for a few areas such as the holes for the clevis pins on leg beams where the tearing of the material was observed with the initial design. A few design changes were done to avoid the tearing of the material. The crane was fabricated with the final design calculations, and field testing was done. The results revealed no tearing of any material or breaking of any pins in the assembly of a Medium Girder Bridge"--Abstract, page iii.
Flanigan, V. J.
Mechanical and Aerospace Engineering
M.S. in Mechanical Engineering
U.S. Army Research Laboratory
University of Missouri--Rolla
ix, 48 pages
© 2006 Tilak Inturi, All rights reserved.
Thesis - Restricted Access
Machine design -- Mathematical models
Machine design -- Testing
Materials handling -- Equipment and supplies
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Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://merlin.lib.umsystem.edu/record=b5848101~S5
Inturi, Tilak, "Testing and analysis of mechanical assists for medium girder bridge" (2006). Masters Theses. 5879.
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