Structural Design Method of Irregular-shaped Hole in Wheel Disc Based on Hyperelliptic Curve
A super elliptic curve and structural design technology, applied in design optimization/simulation, geometric CAD, special data processing applications, etc., can solve the problems of increasing structural weight, etc., to achieve less design variables, small changes in outline dimensions, and good design robustness Effect
Active Publication Date: 2020-05-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
Traditional measures such as chamfering the edge of the hole, polishing, and increasing the weight of the structure cannot fundamentally solve the problem
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[0027] The present invention will be further described below in conjunction with accompanying drawing.
[0028] The present invention will be further described below in combination with specific embodiments.
[0029] First, define the curve equation of the superelliptic shaped hole.
[0030] In the present invention, the following hyperelliptic curve equation is adopted to improve the structure of the roulette holes:
[0031]
[0032] Among them, a and b are the semi-axis values of the hyperelliptic curve, m and n are indices, and their values are different, and the shape of the superelliptic special-shaped hole is different. In this invention, m is taken, and n>2. At this time, the contour of the special-shaped hole is between the square hole Between the hole and the round hole, it is more in line with the actual design requirements of the wheel hole structure.
[0033] According to equation (2), finite element analysis software is used to model the hyperellipse para...
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The invention provides a hyperelliptic curve-based design method for a special-shaped hole structure of a wheel disc, and aims to solve the problem of hole-edge stress concentration of an existing wheel disc hole structure, improve the practicality of a design result and simplify a design process of the special-shaped hole structure. According to the technical scheme, a hyperelliptic curve is adopted for improving the wheel disc hole structure; a multi-objective optimization model of a hyperelliptic special-shaped hole is built, and the contour of the hyperelliptic special-shaped hole is enabled to meet two optimization objectives at the same time: 1) the hole-edge stress level is reduced to a set level; and 2) the hole shape change is as small as possible to meet a force transmission requirement; the model can be optimized to obtain optimal design; the maximum hole-edge stress of the hyperelliptic hole obtained by optimization can be reduced by 10-20% according to the demand of a designer, and the difference between the contour shapes of the special-shaped hole and a previous round hole is relatively small, so that original assembling requirements can be met and reliable force transmission can be ensured; and in addition, relatively few design variables are needed, so that a mathematical model of the contour of the special-shaped hole is concise.
Description
technical field [0001] The invention relates to the field of hole structure optimization design of aero-engine turbine rotor components, in particular to a method for designing a special-shaped hole structure of a wheel disk based on a hyperelliptic curve. Background technique [0002] The working environment of aeroengine turbine rotor parts is harsh, and the bolt holes, vent holes and other hole structures on the web plate of the wheel disc often cause cracks at the edge of the hole due to stress concentration, which becomes an important reason for the failure of the wheel disc. Traditional measures such as chamfering the edge of the hole, polishing, and increasing the weight of the structure cannot fundamentally solve the problem. Contents of the invention [0003] In order to solve the problems of the prior art, the present invention provides a method for designing a special-shaped hole structure of a roulette based on a hyperelliptic curve, which reduces the stress at...
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IPC IPC(8): G06F30/23G06F30/17
CPCG06F30/17G06F30/23
Inventor 郭海丁韩佳欣殷良伟王佳
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS