Abstract
In order that the ultimate state methods can be applied in dimensioning of the load-bearing elements in a conveyance it is required that their design loads should be determined during their normal duty cycle and under the emergency braking conditions. This study aims to verify the predicted loading conditions obtained by theoretical analyses through experiments on a real object. Prior to the actual experimental procedure, limited to measurements of stress acting in the loadbearing cables in the conveyance, the system parameters have been identified. Special attention was given to parameters of roller guides and random irregularities of the guiding strings, which give rise to horizontal displacements of the conveyance and generate the conveyance- shaft steelwork interaction forces.
Highlights
With the assumption made that horizontal displacements of lumped masses are induced by random irregularities and misalignments of the guide strings[1, 2], the analysis of the skip’s dynamic behaviour in normal operating conditions would yield the spectral densities of interaction forces between modelled masses as well as variances of the force amplitudes
The adequacy of the theoretical analyses of system dynamics and of fatigue endurance aspects has been verified through experiments on a real object [4, 5], involving stress and strain measurements in cables
The analysis of measurement results reveals a major discrepancy between predicted data and experimental results
Summary
With the assumption made that horizontal displacements of lumped masses are induced by random irregularities and misalignments of the guide strings[1, 2], the analysis of the skip’s dynamic behaviour in normal operating conditions (at fixed hoisting velocity V0=const) would yield the spectral densities of interaction forces between modelled masses as well as variances of the force amplitudes. Obtained values of forces acting upon the cable cross-sections allowed the maximal stress levels acting upon a single cable to be determined [3]. In order to find the cause of such major discrepancy of results, the Authors first identified the real parameters of roller guides and examined the actual irregularities of the guiding strings
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