MINING EQUIPMENT
Original Paper
UDK 622.673.2 © E.G. Kassikhina*, D.Yu. Sirota, 2024
ISSN 0041-5790 (Print) • ISSN 2412-8333 (Online) • Ugol’ – Russian Coal Journal, 2024, № 4, pp. 92-97
DOI: http://dx.doi.org/10.18796/0041-5790-2024-4-92-97
Title
PARAMETER OPTIMIZATION OF THE JIB CROSS-SECTIONFOR THE MULTI-PURPOSE STEEL HEAD FRAMES
Authors
E.G. Kassikhina*, D.Yu. Sirota
T.F. Gorbachev Kuzbass State Technical University, Kemerovo, 650000, Russian Federation, e-mail kalena-07@mail.ru
Authors Information
Kassikhina E.G., PhD (Engineering), Associate Professor of the Departament of Physical processes and construction geotechnology of subsurface development, T.F. Gorbachev Kuzbass State Technical University, Kemerovo, 650000, Russian Federation, e-mail kalena-07@mail.ru
Sirota D.U., PhD (Engineering), Associate Professor of the Departament of Physical processes and construction geotechnology of subsurface development, T.F. Gorbachev Kuzbass State Technical University, Kemerovo, 650000, Russian Federation
Abstract
The existing calculations of the structural elements of steel headframes include the calculation of the headframe, which is reduced to the determination of internal forces with subsequent checks for limit states by analogy with beams of constant cross section. Since bending moments usually vary unevenly along the length of the jib, selecting its cross section according to the largest bending moment, an excess supply of material is obtained in all sections of the jib, except for the one that corresponds to the maximum value of the moment. This approach does not make it possible to obtain a design with a minimum material consumption, since the cross section is constant along the entire length of the jib and is designed for maximum efforts characteristic of only a small area.
To obtain a rational cross section of the jib, it is necessary to strive to ensure that, if possible, the largest volume of material works at stresses equal to or close to the allowable ones. In the proposed jib with a section variable in height, efficiency is achieved by optimizing its dimensions in accordance with the diagrams of internal forces. To calculate such structures, the method of splitting the entire element into smaller rod elements of constant stiffness is used. Most of the software packages for structural analysis do not have the possibility of automated input for such sections. It is necessary to justify the choice of various options for design solutions for the formation of a block of input parameters for automated calculation for jibs of variable cross section.
The scientific significance of the proposed technical solution lies in the fact that a space of mutually influencing design variables has been formed in relation to the problem of minimizing the weight of the multifunctional pile driver jib structure. A formula is obtained for determining the set of pairs of optimal values of independent design variables, applicable for the formation of a block of input parameters for automated calculation of jibs of variable cross section.
The practical significance lies in the implementation of a simplified search for the optimal parameters of the jib cross section by visual analysis of the obtained graphs, which makes it possible to obtain a variety of acceptable alternative designs within the established design criteria.The main stimulus for the study of the jib was the calculation of significant characteristics for a variety of combinations of section parameters in order to minimize its weight. The results of the study are used to assess the adequacy of design alternatives and their relative merits based on established design criteria.
Keywords
Steel angle headframe, multifunctional steel angle headframe, jib variable cross-section height.
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For citation
Kassikhina E.G., Sirota D.Yu. Parameteroptimization of the jib cross-section for the multi-purpose steel head frames. Ugol’. 2024;(4):92-97. (In Russ.). DOI: 10.18796/0041-5790-2024-4-92-97.
Paper info
Received November 22, 2023
Reviewed February 28, 2024
Accepted March 26, 2024
