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

A discrete variable, balanced design technology, applied in computing, special data processing applications, instruments, etc., can solve problems such as the optimal radius size does not meet the processing standards, the contour of the special-shaped hole is too large, and it is difficult to obtain stable design points. , to achieve the effect of suppressing excessive dependence on the value boundary of variables, reducing the total amount of computation, and improving design efficiency

Active Publication Date: 2015-11-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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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

Method used

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

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Embodiment Construction

[0042] The present invention will be further described below in combination with specific embodiments.

[0043] 1. Implementation method of discretization of design variables

[0044] 1) Discretization of the initial population: firstly, according to the arc radius standard series stipulated by the national standard, a standard candidate pool for each design variable is established to store the standard value of the arc radius; Variables are rounded. The principle is: the standard value of the arc radius series that is greater than the initial value and closest to it. It is guaranteed that each design variable sample is a discrete value randomly generated in the radius standard sequence pool.

[0045] The mathematical model of the custom conversion function is:

[0046] x t =min{X s |X s ≥X i}

[0047] Among them, X t Indicates the discrete design variable value after rounding, X s Indicates the standard value in the standard candidate pool, X i Represents a randoml...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 郭海丁韩佳欣孙青平陈秋任张超
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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