INFLUENCE DYNAMIC LOADS ON THE STRENGTH AND DURABILITY OF THE ELEVATOR INSTALLATION ROPES
Abstract
Dynamic processes in the lift car are described by a system of park differential equations of the second order, taking into account the longitudinal and torsional vibrations of the hoisting ropes and longitudinal oscillations of counterbalancing ropes. It was found that the main influence on the dynamic forces in elastic elements of the elevator installation in the start-up mode is particularly made by external force action, in particular, the mechanical characteristics of engine starting. The dynamic braking force in the cables reaches the maximum value in the first period of the safety braking process, i.e., up to the drive pulley stop. As the result of the numerical study data on the values of the largest longitudinal and torsional deformations and tension in ropes are obtained.Keywords: dynamic forces, longitudinal-torsional deformation, normal tension, strength, the rope durability.
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