Structure Optimization Method Of The Float-tile

The application of the float-tile in combustion chamber is important for aero-engine to improve it's performance. In foreign countries, the float-tile has been successfully applied in some advanced engines. However, in our country, it is absorbing more and more attentions. But, there are many difficulties in it's design technology because of the complex of float-tiles and the severe working environment. This paper studies the design method of float-tile by using the multi-object structural optimization method of GA-FEM, which combines Genetic Algorithm and Finite Element Method. The research work in this paper is mainly included the following: (1) Two methods, AGA-FEM and PGA-FEM, are used to optimize the poles' positions on the flat structure, which is a simple model of the float-tile. The study indicates that PGA-FEM has the better performance. This paper also studies the relationship between the convergent efficiency and the illumine conditions of the simple model, the relationship of the objective function and the results of the optimization design. (2) Considering complexity of the float-tile structures and the working environment, an optimization tactic is put forward. The tactic is achieved by adding the variable and the complex conditions step by step. The optimization of the poles' topology positions is the first step based on the poles' number. Based on the results of the first step, the poles' area is optimized. Accordingly, the thickness of the float-tile is optimized based on the above results. Using the tactic in optimization can reduce the difficulties, improve the efficiency and make the process more easy to be controlled. The tactic is proved to be efficiency by the study of the float-tile's optimization. (3) The method of GA-FEM is carried out on the base of the ANSYS software and VC++ program language. The program, with powerful analysis capability, is easy to transplant.