Static And Dynamic Finite Element Analysis For The Structure Of M02-type Portal Crane

As the throughput of port cargo has been increasing gradually, portal cranes amajor machinery play more and more inportant role in the port handling andtransportation.The structures of portal crane belongs to large machiney. If the incidents occur, itwill affect the normal operation of the port seriously and harm to staff. In order toguarantee the safety and orderly conduct of the port and protect the safety of staff, wemust first ensure that the cranes can work safely, normally and stably. Therefore, inorder to eliminate hidden dangers, avoid risk factors and guide the safe and efficientoperation of cranes, it is necessary to put up static and dynamic finite elementanalysis for the structure of the portal crane to find the dangerous location of cranes,and determine the natural frequency of the crane, and so on. The10-ton M02-typeportal crane was analysed in this paper. The aspects of the study will state as follow:The structure of the crane was simplified scientifically and reasonably. Wechoose shell element and beam elements to establish the whole model of the portalcrane. Through the analysis of the structure and specific work condition of the crane,the most dangerous working conditions are found. Based on the actual workingcondition, boundary conditions and load conditions of the model are determined. Andthen, using finite element analysis method to calculate the static performance of cranemodel, the distribution and deformation ruler of crane structure are given. At the sametime, the dynamic analysis was done on the whole three-dimensional model ofM02-type portal crane, that is, modal calculation. The natural frequencies of themodel were calculated and each stage of model shapes were found, which can avoidthe resonance phenomenon of the portal crane in the work.Combining with on-site testing results, as well as finite element analysis resultsof the whole portal crane, we select some major force components such as thebearings on the man-like shelf, the supports of crane jib of the engine room and thebase of the running gear. Respectively, we establish finite element analysis models for each of these components to study their strength and stiffness under maximum load,and then analyse their stress-strain state.According to fatigue theory, the fatigue S-N curves of materials is given. And wefind out the danger place of the global and local of the portal crane based on theglobal and local static and dynamic analysis of the portal crane. Then we study theworking performance of the portal crane, determine the stress variation of dangerplace under different working conditions, and make a fatigue strength calculation ofthe portal crane.A strain measurement is then carried out on the key points of the portal crane.The stress value of the key point is calculated. And comparing the testing results withthe calculation results of FEM, we verify the reliability of modeling and computing ofFEM..