Kinetic Behavior And Protection Research Of Rail-Mounted Crane Under Strong Wind

The sliding of the whole machine often occurs under the crane is attacked by the strong wind,which might contributes to the overturning of the crane.Regarding to present research focusing on the introduction and improvement of various anti-skid devices instead of studying the correlation between sliding factors and crane overturning,this paper takes the quayside container crane(quay crane)as the research object,establishes its wind-resistance vibration response model,analyzes its dynamic response structure and determines the key role of the sliding factor in the crane wind disaster accident by theoretical analysis,numerical simulation and finite element simulation.The research results are reflected in the following aspects.(1)Firstly,based on the analysis of the structural feature of the quay crane and the working characteristics of windbreak ropes,the dynamic model of the crane protected by the wind break is established.Then,referring to the actual wind-resistance criteria of the port crane,the eleven working conditions of quay crane under the wind-resistance condition of the port crane are discussed,and its corresponding modified wind-resistance prevention mechanisms were established.Finally,the simulation method of wind load and the analysis model of wheel-rail friction are determined by theoretical comparison and analysis.(2)Based on the mechanism model of quay crane,the numerical simulation and finite element analysis on the dynamic behavior of the crane were carried out.The results from the theoretical calculation of the mechanism model and the finite element simulation calculation of Abaqus are remarkable consistency,which shows the wind-resistance mechanism model accurate and reliable in analyzing the dynamic response of the quay crane moving along the rail.In addition,the dynamics of the rest operating conditions are analyzed respectively in accordance with the modified model.After comparing the results of various operating conditions,it is found that the sliding of the whole machine will greatly affect the vibration response of the quay crane and the larger the sliding displacement,the more severe the vibration,which is basically independent of wind loading and other wind protection devices.(3)The influence of the key external parameters on the safety of the wind-resistance device is analyzed,and the sensitivity of the parameter is described by the tornado diagram method.Above analysis results illustrate that the larger the diameter of the cable,the closer the sliding of the whole machine,the greater the friction factor,the safer the cable is,and the force of the cable is most sensitive to the change of the sliding displacement of the whole machine.(4)A new self-locking and anti-skid device for limiting the sliding movement of a rail-mounted crane is proposed and its mechanical model is established.Meanwhile,its structure characteristics and working principle are introduced.By the numerical simulation of anti-sliding performance of the device,the results show that the sliding of the crane is effectively suppressed,and the stress of the wind-proof cable is also significantly reduced under the protection of this new anti-skid device.