Research And Implementation Of Load Distribution Method

Aircraft’s structural analysis need to load inertial loads and aerodynamic loads. Theexisting finite element softwares affords comprehensive processing methods to solve thegeneral inertial loads, but the inertial loads caused by non-structure masses are neglected.Also, it difficult to load the non-uniform loads, like aerodynamic loads, on the model directly.There is one feasible approach—to convert inertial loads and aerodynamic loads to finiteelement nodal loads before loading. The contents of this paper is as follows：The load distribution calculation algorithm based on the principle of minimumdeformation energy is studied to find out the reasons why the calculation results are differentby using different aerodynamic loads distribution situation; in the calculation, the method ofLagrange Multiplier Method is employed to assume the curved surfaces to be planar, Then,practicable method is suggested to calculate the inertial loads;The data format in Fluent exported INP file is studied to find out the method of how toget nodes coordinates and nodes loads; the format of the the INP file generated by Abaqus isanalyzed, to find out how to get nodes information from the selected collection of nodes andhow to load loads in the INP file; the formats of rpt*file and bdf file generated by Patran isstudied to generated to find out the method of how to get nodals information;Further, based on the above research, the load distribution calculation program isdeveloped with the help of C#in Visual Studio2008environment; This newly developedprogram could loads inertial loads and aerodynamic loads to the models built in thecommercial softwares Abaqus and Ptran;Finally, the two examples, the example of the structure of the mass distributioncharacteristics calculation and the Fluent calculation results loads to the Abaqus finite elementmodel, shows the algorithm’s accuracy and effectiveness of the program.In short, the algorithm, and the program developed in this paper show that loads can beloaded automatically, which improves the efficiency of analyzing structures and make up the shortcomings of commercial software for not being able to consider the non-uniform loads.