Fuel rod shape optimization method based on Bezier curve

Abstract

The invention provides a fuel rod shape optimization method based on a Bezier curve. The method comprises the following steps: 1, building an x-y coordinate system through employing a central point ofa cross section of a fuel rod as an origin of coordinates, carrying out the shape optimization of a quarter of the outer contour of the fuel rod in a first quadrant, and setting a target function; 2,fitting a quarter of the outer contour of the fuel rod by adopting a quadratic Bezier curve to obtain three Bezier curves and seven control point coordinates, and taking the seven control point coordinates as design variables; 3, formulating constraint conditions according to the original size data of the outer contour of the quarter of the fuel rod; 4, calculating the perimeter of the outer contour of the quarter of the fuel rod and the area defined in the first quadrant; and step 5, according to the objective function, the design variable and the constraint condition, writing an optimization program in Matlab, then performing operation to obtain an optimization result of the outer contour of the quarter of the fuel rod, and drawing according to the optimization result of the outer contour of the quarter of the fuel rod to obtain the optimized overall outer contour of the fuel rod.

Description

technical field [0001] The invention relates to a shape optimization method, in particular to a fuel rod shape optimization method based on a Bézier curve. Background technique [0002] Structural optimization design is based on the optimization theory in mathematics, using computers as means, according to the performance goals pursued by the design, establishes the objective function, and seeks the optimal design scheme under various given constraints, including size Optimization, shape optimization and topology optimization. [0003] In the industrial field, in order to improve the combustion efficiency, the fuel rod is required to have a larger external area under a certain volume, so it is necessary to optimize the structure of the fuel rod. However, in the prior art, when optimizing the structure of the fuel rod, it is necessary to Take a number of discrete points, and then set the optimization direction for the coordinates of each point. The optimization accuracy depe...

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Problems solved by technology

[0003] In the industrial field, in order to improve the combustion efficiency, the fuel rod is required to have a larger external area under a certain volume, so it is necessary to optimize the structure of the fuel rod. However, in the prior art, when optimizing the structure of the fuel rod, it is necessary to Take a number of discrete points, and then set the optimization direction for the coordinates of each point. The optimization accuracy depends on the number of discrete points, but the increase in design variables will lead to cumbersome workload and low optimization efficiency. Discrete, it is impossible to guarantee the precise expression of the curve outline of the fuel rod during optimization

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