Topology Optimization For Plane Frame Of Fuselages

Stiffened panel under uniform pressure is widely used in aviation, aerospace and navigation. The optimum combination of stiffened panels’ mechanical performances, including both stiffness and strength properties, can be obtained by conducting the topology optimization design. As a result, the material utilization rate is improved and the economic cost is reduced. But the multiple design variables and the complicated relations between them make it an urgent task to solve the rapid optimization of engineering design problem.This paper reviews the structure optimization design method as well as its development course. In order to solve the topology optimization problem of the equidistance and unequidistance stiffened panels under uniform pressure, two two-level layout optimization design methods are respectively developed. And the effectiveness of two methods are verified by conducting three optimization examples.But previous parametric modeling of numerical optimization methods commonly takes a lot of time and the later optimization process needs much computational expense. So a engineering method for topology optimization of stiffened panel under uniform pressure is proposed based on the path of force transfer. This engineering method firstly apply engineering approximate approach to get the bending moment distribution of four edges simply supported rectangular substrate under uniform pressure. The number of the horizontal and vertical rods is then determined according to the bending moment distribution and the carrying capacity of a given rod. Finally, the thickness of the substrate is determined based on the layout of the rod. The method can quickly obtain a good optimization result by calculating a few simple expressions, which apply to the engineering design. Two optimization examples are completed by the engineering method and compared with the results of the equidistance stiffened panels’ two-level layout optimization design. The results show that the engineering method is not only simple and feasible, but also has a good optimization effect.