Research On Design Of Combined-boom For All Terrain Crane Based On Large Deflection On The Tower Jib Condition

All-terrain crane is widely used in the energy, chemicals, rescue, docks and other places, especially in some of the higher altitude and larger job coverage area,the main arm condition can not meet the loading need,but the advantages of all-terrain crane on the tower jib conditions can work well in this occasion. Because of large displacment, it’s very necessary to use nonlinear finite element.Lifting weight is a sign of the measure of crane’s lifting performance, and lifting performance table is delivered with all-terrain crane as important technical documents.The boom’s strength has a great influence on lifting performance, therefore it is particularly important for the calculation of the lifting performance based on the boom’s stress.Front stay bar and rear stay bar are poles used for supporting other structures is designed to meet the the luffing requirements,which is essential in the starting-arm process,hanging upload process,the tower jib luffing process.The geometrical parameter has impact on boom’s and other structure’s strength,so it’s very important to research about the designing of front stay bar and rear stay bar.In this paper,1200t all-terrain crane is the object for research,focus on the lifting performance calculation based on strength and the influence which the designing of stay bar has on the force performance of boom. The main contents of the paper are as follows:(1) The principle of all terrain crane and the constitution of vary working conditions are realized.The finite element model of all terrain crane is established on the tower jib condition according to the structure characteristic of all terrain crane and the forced conditions on the tower jib condition.(2) The basic flow of nonlinear finite element is analyzed,and establish the function module to realize the assembling of stiffness matrix,overall load assembling coordinate matrix transform,unit rod ends resistance calculation and other function. Newton iteration method is applied for the iterative solution of the nonlinear beam element,thus attains the calculation of nonlinear nodal force and deformation,and compare with ANSYS to guarantee the correctness. (3)The interation algorithm and the working radius which are used in the process of lifting performance calculation are researched.at last,we get the lifting performance table based on nonlinear strength.(4) In order to carry out rod’s lengfth design,the arm strength and the key hinge point stress is judged.The studies have shown that the the strut geometrical parameters has greater impact on boom strength. Meanwhile The result of this paper is applied to the practical project that’s1200t all terrain crane,and provide someguide for the design of strut,this method has common significance.