Research On Structural Optimization And Mechanical Property Of New Type Crossing Frame

With the rapid development of social economy and the acceleration of power grid construction,overhead transmission lines across roads,railways,existing transmission lines and other facilities are increasing.In the new transmission line stringing construction,it is necessary to set up the crossing frame to ensure the normal operation of the crossed facilities and the safety of the overhead transmission line construction.For the traditional crossing structures such as scaffold type and holding pole type,their mechanization degree is low,which requires a lot of manpower and material resources,and it is difficult to meet the construction requirements at this stage.Because of these shortcomings of the traditional crossing frame,it is urgent to develop a new type of crossing frame with fast mobility and high safety.Two new types of movable and unfolded lattice crossing structures are proposed.According to the different force forms of the boom,they are called guyed crossing and hydraulic crossing respectively.Compared with the traditional crossing structure,the new crossing structures have higher mobility and safety,and are more convenient and fast to set up.According to the design requirements of the crossing frame,the structural forms of two new types of crossing frames are preliminarily designed,and the sections of each component of the crossing frames are preliminarily selected by finite element method.ANSYS finite element software is used to carry out the mechanical analysis of the two new crossing structures,and the numerical results show that the mechanical properties of the structure basically meet the design requirements.In order to reduce the mass of the new crossing structure and make the structure more reasonable.The firefly optimization algorithm and penalty function method are used to optimize the size of two new structures,with the minimum mass as the optimization objective,the cross-section size as the design variable,and the allowable strength and stiffness as the constraint conditions.The optimization results show that the masses of the two new structures are significantly reduced,the section sizes are more reasonable,and the relevant mechanical properties meet the design requirements.The size optimization results show that the firefly optimization algorithm is effective in the lightweight design of the crossing structure,and the optimization method can provide reference for engineering designers in lightweight design and section selection of crossing structure.