Analysis by Finite Element Method to Redesign a Jointed-Telescopic Crane for Elevation of Personnel
This study presents a numerical assessment of a crane for elevation of personnel by finite element analysis, validated with experimental data from constituent components of the crane. The original design of the crane consists of a jointed section of coplanar arms and a telescopic section of collinear arms. As a reference, the standard ANSI/SIA 92.2 was used to determine maximum loads and the consequent effects on the constituent components of the crane. This standard is suitable for crane designs distributed and commercialized in Mexico. The proposed numerical analysis is carried out through a finite element analysis, which is based on the assembly method of kinematic pairs, taking into account dynamic loads and their resulting reaction at each element. The mechanical performance of each component is assessed with the minimal security factor parameter. However, in those components where the minimum security factor was insufficiently in accordance with the standard, a variety of modifications to redesign a given component was proposed. Subsequently, a detailed structural analysis on the proposed redesign was carried out, in which higher security factors were obtained in comparison to the original design. Finally, the numerical results of the proposed redesign were validated through experimental measurements of strain, using strain gauges attached on a crane prototype, which was manufactured according to the proposed redesigned model.
Keywordscrane for elevation of personnel finite element analysis structural redesign assembly method by kinematic pairs analysis with dynamic loads
The authors want to express their gratitude to: Dr. Hector Plasencia Mora, Executive Director of Guanajuato Techno-Park; Dr. Miguel Torres Cisneros, lecturer of University of Guanajuato; Mario Villegas Urquidi, CEO of Tecnica Hidraulica del Bajio S.A de C.V, and the Council of Science and Technology of Guanajuato (CONCYTEG) for all the support given to this project. A special mention must be given to Leonel Esquivel Villegas, bachelor student of mechanical engineering of the University of Guanajuato for his technical support provided during the experimental tests.
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