Engineering discrete variable based two-variable multi-circular arc special-shaped hole balance design method and model

Abstract

The present invention discloses an engineering discrete variable based two-variable multi-circular arc special-shaped hole balance design method and model. The method comprises: firstly, establishing a standard alternative pool for each design variable according to arc radius standard series defined by international standards, to store arc radius standard values; secondly, performing rounding on original continuous variables by using a self-defined conversion function; thirdly, performing control on design space of discrete variable combination by using a boundary verification module, and performing deletion on cross-boundary parameters; and finally, performing optimization iteration, and before optimization, performing sequential numbering on discrete design points by size. In the optimization iteration, when a new design point is selected, a new design point number is selected through number calculation, and then a new design point is determined according to a mapping relationship between the numbers of the discrete design points and actual design points. According to the method, the two-variable special-shaped hole profile design radius meets an industrial manufacturing standard, and the design of a connecting unit of a high-pressure turbine plate of an aircraft engine meets an equal-strength principle, thereby improving design efficiency.

Description

technical field [0001] The invention belongs to the structural optimization design of turbine rotor components of aero-engines, and in particular relates to a contour shape optimization design method and model of special-shaped bolt holes of turbine discs. Background technique [0002] The bolt holes on the front mounting edge of the high-pressure turbine disk of the aero-engine mainly adopt a circular hole structure. Working in a high-pressure and high-temperature environment for a long time, stress concentration is prone to occur on the edge of the circular hole, resulting in cracks at the edge of the hole, which seriously affects the use of the turbine disk and even the entire engine. life. [0003] Aiming at this problem, the bolt hole on the turbine disk was improved into a special-shaped hole structure for the first time in the CFM56-Ⅲ engine. A research team of Nanjing University of Aeronautics and Astronautics made a lot of research on the profile structure character...

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Problems solved by technology

[0004] 1. The profile of the special-shaped hole obtained from the design is too dependent on the value range of the set design variable, which is not conducive to engineering design

[0005] 2. It is difficult to obtain a stable design point, and it is difficult to quickly converge to the optimal solution when designing with the original method, which takes a long time

[0006] 3. The original design method is optimized for continuous variables, and the optimal radius size obtained does not meet the actual industrial processing standards, which brings difficulties to actual processing and testing

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