Influence of Uneven Braking of Running Wheels on Stress–Strain State of Crane Metal Structure

Streltsov, S. V.; Ryzhikov, V. A.

doi:10.1007/978-3-319-95630-5_221

Cited by 1 publication

(1 citation statement)

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“…Vöth [31] proposed a new emergency braking scheme for a coal handling gantry hoist to prevent high loads from appearing on the drive chains of the hoist, which was equipped with an additional safety brake on the rope drum. Streltsov et al [32] investigated the stress-strain state of the steel frame of a gantry crane under the horizontal constrained forces of rails caused by the difference of the braking torques of the brakes located on the two sides of the gantry crane when braking.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Dynamic Analysis of Lifting Mechanism of an Electric Overhead Crane during Emergency Braking

Niu

Ouyang

2020

Applied Sciences

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Mechanical brakes are essential for electric cranes when emergency braking occurs. This paper presents, for the first-time, a dynamic response analysis of emergency braking events of electrical cranes that has modelled crane components as flexible and rigid bodies. Based on the Hamilton principle, a nonlinear and non-smooth dynamic model is derived from a modified Lagrangian function and the virtual work of non-conservative forces. The dynamic responses of a 32-ton overhead travelling crane during the emergency braking process of its lifting mechanism with two service brakes determined by simulating realistic operations. The numerical results show that the loads acting on components of the crane during the braking process depend on the braking capacity and the action time of the mechanical brakes, as well as the magnitude and the initial position of the payload. When a dual-brake scheme of the lifting mechanism is adopted, the maximum load of the high-speed links and the maximum thermal power of the mechanical brake appear in the emergency braking process when one of the two brakes fails to work. In addition, it is found to be a false belief that the lower the initial speed, the lower the maximum loads acting on components of cranes become during the braking process.

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Section: Introductionmentioning

confidence: 99%