Wind Load Dynamics Analysis And Structural Improvement Of Cable Lifting Conveyor

With the intensification of serious pollution problems caused by power generation on board ships,the conversion of the original coal-fired power supply to the port cable power supply after the ship docked has become a global trend,which has led to a sharp increase in the demand for shoreline cable lifting conveyors.Because the frequency of windy weather in the port is much higher than that in the inland,the accidents caused by the wind in the port machinery are endless every year.Therefore,it is of great significance to carry out wind load dynamics analysis and structural improvement for the cable lifting conveyor.In this paper,the following research work is carried out on the device with structural wind engineering and some theoretical knowledge of fluid mechanics:(1)Using 3D software to draw a 3D model of the cable lifting device lifting frame structure and then enter the workbench to draw the flow field model,properly simplify and process the model and mesh in the workbench for subsequent analysis.So prepared(2)Establish a fluid-solid coupling system in the workbench,design different working conditions under four stable wind speed conditions,and compare and analyze the influence of stable wind speed on the structure.The results show that the maximum wind pressure appears in the inner side of the third layer and on the windward side of the ear plate,and the maximum wind pressure in the lateral wind direction appears on the third windward surface and the fourth layer constraint;the structure is vertical.The effect of the transverse wind that changes irregularly in the direction of wind speed;the maximum wind speed in the non-working state has a greater impact on the structure.(3)In order to judge the accuracy of the software analysis,the theoretical formula and the experimental two methods are used to verify separately.The wind load calculation method provided by the crane design manual is compared with the wind load calculated by the software.The results of the two are similar and the value calculated by the manual is slightly larger;the measured stress value is compared with the software calculated stress value.The results are not very different.This proves that the software analysis results are accurate.(4)Using the workbench to carry out the modal analysis of the lifting frame structure,and obtain the sixth-order mode and corresponding frequency of the lifting frame to understand the vibration characteristics of the structure;design several dynamic wind conditions to analyze the dynamics of the lifting frame.The effect of wind action.The analysis shows that the wind load change period of any wind direction is the same as the wind speed change period and the amplitude is only related to the wind speed amplitude.The wind with the frequency below 1 Hz has little effect on the structure.(5)Optimize the material of the lifting frame by the above analysis,and analyze and improve the wind load of a part of the conveying device by the above method.The improved device is subject to reduced wind loads and improved transport efficiency.