Displacements in Mechanical Systems Due to Random Inputs in a Mine Hoist Installation
state of stress in the conveyance’s load-bearing elements due to real loads acting both during the normal duty cycles and under the emergency conditions.
Real loads acting upon the load bearing elements of the conveyance were determined following the analysis of displacements of selected points of the conveyance’s structure. For the purpose of calculation procedure, the conveyance is substituted by a triple mass model whose dynamic motion equations are based on an assumption that horizontal displacements of the skip mass are induced by random irregularities and misalignments of guiding strings. These equations are solved analytically, yielding the spectral densities of displacements of selected masses. Thus derived formulas and their graphical representations allow for selecting the system’s parameters such that the displacements of the selected model points should not exceed the admissible levels set forth in relevant mining regulations.
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Mining regulations: Regulation of the Council of Ministers of 30 April 2004 on the approval of products for use in mining plants (Journal of Laws No. 99, item 1003, 2005, No. 80, item 695, 2005, and No. 249, item 1853, 2007, item 1.2 Lifting vessels).