A methodology for calculating limit deceleration of flexible hoisting system: A case study of mine hoist

Abstract

Mine hoist is a typical flexible lifting system. Due to the cable flexibility, the system is prone to severe shocks and even slippage during emergency braking. To establish a safe emergency braking operation for mine hoist, retarded velocity should be less than the limit deceleration value. The simplified mathematical model shows that the system dynamic response along the longitudinal axis of the wire rope (longitudinal dynamics) is a typical second-order underdamped one. Due to the inherent characteristics of the flexible lifting system, the longitudinal dynamic response under slippage condition exhibits the following characteristics: the response curve deviates from the input signal, that is, the retarded velocities of cable and pulley at their contact points are no longer equal. Based on this finding, deceleration deviation coefficient is defined to normalize the longitudinal response curves, which can help us to determine the extent to which the output signal deviates from the input one; and the sudden increase in the deceleration deviation coefficient is considered as an indicator of rope slippage during emergency braking. The proposed scheme is verified and evaluated by means of simulation model. Subsequent results indicate that the limit deceleration valves obtained by the proposed approach have the same trend and magnitude as those obtained by conventional one, which illustrates that the proposed methodology is feasible. The advantage of the proposed approach is that the solution for each set of operating parameter is unique and certain. As for the conventional approach, the solution is not unique because of the introduction of safety factor, which will cause some trouble to the user. In subsequent work, a test bench will be set up to verify and optimize the proposed scheme.

Neural adaptive braking control for single rope winding hoisting systems with disturbance compensation

“…Furthermore, the traditional PI and traditional backstepping (BT) controller are chosen as the comparative experiments to illustrate the advantage of the developed controller in this paper. Referring to the braking performance requirements of the JKMD 3.25 × 4 II mine hoist in Huang et al 37 two performance requirements for braking control on the simulation test rig are summarised. The first one is that the tension of wire rope shall not exceed 1250 N , and another one is that the peak acceleration shall not exceed 0 . 25 m / s 2 during braking with lifting load 100 kg and desired deceleration 0 . 1 m / s 2 .…”

Investigation of Dynamic Load in Superdeep Mine Hoisting Systems Induced by Drum Winding

“…He [9] has also studied the longitudinal rope dynamics in a friction hoisting system and its coupling effect with friction transmission and concluded that the tension fluctuates obviously, and the dynamic tension regime expands with the friction coefficient increase. Huang et al [10] have simplified the longitudinal vibration model of a mine hoisting as a second-order underdamped system and obtained its dynamic response in the slipping and unslippage state for a safe emergency barking operation. Wu and Kou [11] have established the longitudinal-transverse model of mine friction hoist by using of Hamilton's principle, and the modified Galerkin's method has been used to discretize partial differential Equations.…”