Search

CN-122020885-A - Bolt hole design method and system

CN122020885ACN 122020885 ACN122020885 ACN 122020885ACN-122020885-A

Abstract

The invention discloses a bolt hole design method and a system, which belong to the technical field of aeroengines and comprise bolt hole structure definition and bolt hole structure parameter optimization, wherein the bolt hole structure definition comprises the steps of describing a bolt hole contour structure by adopting spline curves with at least two sections connected end to end, setting each section of spline curve and control points to meet preset geometric constraint conditions, and the bolt hole structure parameter optimization comprises the steps of taking spline curve control parameters as design variables and at least one engineering performance index of the bolt holes as an optimization target, establishing a parameter optimization model, adjusting the design variables through the parameter optimization model to obtain the bolt hole structure parameters meeting the engineering performance index, designing a bolt hole structure with arbitrary curvature and continuous and smooth curves, and ensuring that the bolt hole structure obtains required curvature at a specific position under different conditions.

Inventors

  • LUO FENG
  • WEN CHANGLONG
  • ZHENG YANBING
  • LIU SIFAN
  • LI JIAQIANG
  • LI WEIGANG
  • Jia Hanhan
  • WANG BIN
  • DENG WANGQUN
  • LI WEI
  • MI DONG
  • LI JIAN
  • QIAN ZHENGMING
  • HU TINGXUN
  • ZHANG WEIFENG
  • ZHANG LIZHANG

Assignees

  • 中国航发湖南动力机械研究所

Dates

Publication Date
20260512
Application Date
20260113

Claims (10)

  1. 1. A bolt hole design method, comprising: Bolt hole structure definition and bolt hole structure parameter optimization: wherein the bolt hole structure definition includes: Describing a bolt hole contour structure by adopting spline curves with at least two even sections connected end to end; Setting each section of spline curve and control points to meet preset geometric constraint conditions; wherein bolt hole structural parameter optimizes, includes: Using spline curve control parameters as design variables and at least one engineering performance index of the bolt holes as an optimization target, and establishing a parameter optimization model; And adjusting design variables through a parameter optimization model to obtain bolt hole structure parameters meeting engineering performance indexes.
  2. 2. The method of bolt hole design according to claim 1, wherein the spline curve is a non-uniform rational B-spline curve.
  3. 3. The method of claim 2, wherein the setting of each spline curve and control point satisfies a predetermined geometric constraint condition, comprising: The control points of each section of spline curve are odd numbers, and the middle control point is positioned on the radial symmetry axis of the bolt hole; The control points of each spline curve are symmetrically distributed about the radial symmetry axis; The spline curves at two adjacent ends are controlled to be collinear at the connecting point; And a gap which is not smaller than the radius of the bolt shaft is arranged between the bolt hole profile described by the spline curve and the bolt shaft.
  4. 4. A method of bolt hole design according to claim 3, wherein the bolt hole profile is described by at least two end-to-end spline curves, comprising: and establishing a coordinate system by taking the center of the bolt shaft as a coordinate origin, wherein the two sample curves are respectively an upper part curve distributed in the first quadrant and the second quadrant and a lower part curve distributed in the third quadrant and the fourth quadrant, and the connection point of the two sample curves and the control point of the adjacent position are on the same straight line.
  5. 5. The method of designing a bolt hole according to claim 1, wherein the engineering performance index includes at least one of a maximum equivalent stress, a maximum circumferential stress, a maximum principal stress, a maximum radial displacement of a baffle plate, and a bolt pressing area of a bolt hole edge.
  6. 6. The bolt hole design method according to claim 1, wherein the parameter optimization model comprises an optimization mathematical model and an optimization physical model, and parameter optimization is performed based on the optimization mathematical model and the optimization physical model.
  7. 7. The method for designing the bolt hole according to claim 6, wherein the optimized mathematical model takes the maximum equivalent stress of the bolt hole edge as an optimized target and takes the maximum circumferential stress, the maximum principal stress, the maximum radial displacement and the bolt pressing area as constraint conditions.
  8. 8. The method of bolt hole design according to claim 6, wherein optimizing the physical model comprises creating a parameterized model of the part containing the bolt holes; and simulating the parameterized model of the part.
  9. 9. The method of designing a bolt hole according to claim 8, wherein the constraint conditions of maximum circumferential stress, maximum principal stress, maximum radial displacement, and bolt pressing area include: The maximum circumferential stress is not greater than an axial stress limit value, the maximum principal stress is not greater than a principal stress limit value, and the maximum radial displacement is not greater than a radial displacement limit value; The bolt compression area is not smaller than the compression area limiting value.
  10. 10. A bolt hole design system, comprising: The structure description module is configured to describe the bolt hole contour structure by adopting spline curves with at least two sections, even sections connected end to end, wherein the setting of each section of spline curve and control points meets the preset geometric constraint condition; The parameter optimization module is configured to take spline curve control parameters as design variables and at least one engineering performance index of the bolt holes as an optimization target, establish a parameter optimization model, and adjust the design variables through the parameter optimization model to obtain bolt hole structure parameters meeting the engineering performance index.

Description

Bolt hole design method and system Technical Field The invention belongs to the technical field of aeroengines, and particularly relates to a bolt hole design method and a bolt hole design system. Background The conventional bolt hole design generally adopts a conventional curve to describe the bolt hole structure and adopts an empirical adjustment parameter mode to obtain the structure which finally meets the engineering requirements, but the design method is definite in description mode, the empirical adjustment parameter mode is time-consuming and labor-consuming, and the bolt hole structure which meets the engineering requirements can not be designed. The existing bolt hole design method usually adopts curve description structures such as circles, straight lines and circular arcs, multiple sections of circular arcs, ellipses, superellipses and the like, and then obtains structures meeting engineering requirements according to empirically-adjusted curve definition parameters, for example, the circle definition parameters are circle centers and radiuses, if the bolt hole structure is described by circles, the curvature of the structure at any position is a fixed value when the radiuses are fixed, the mode of combining the multiple sections of circular arcs or straight lines and the circular arcs can improve the fixed curvature phenomenon to a certain extent, but the fixed curvature is still designed in the bolt hole position range, and the ellipses and superellipses have fixed maximum curvature and minimum curvature positions and fixed variation trend, so that the hole structure cannot be ensured to obtain the required curvature at the specific position under any condition. The structure of the bolt hole is determined no matter how the curve definition parameters are adjusted, the design is carried out under the condition of determining the curve structure, and the structure meeting the engineering requirement is difficult to design when the hole structure of the high-speed rotating machine is designed. The invention provides a bolt hole design method, which can design a continuously variable curvature bolt hole structure, thereby not only increasing the freedom degree of the design of the hole structure, but also enabling the designed hole structure to meet engineering requirements. Disclosure of Invention In order to solve the problems, the invention provides a bolt hole design method, which comprises the following steps of bolt hole structure definition and bolt hole structure parameter optimization: wherein the bolt hole structure definition includes: Describing a bolt hole contour structure by adopting spline curves with at least two even sections connected end to end; Setting each section of spline curve and control points to meet preset geometric constraint conditions; wherein bolt hole structural parameter optimizes, includes: Using spline curve control parameters as design variables and at least one engineering performance index of the bolt holes as an optimization target, and establishing a parameter optimization model; And adjusting design variables through a parameter optimization model to obtain bolt hole structure parameters meeting engineering performance indexes. Further, the spline curve is a non-uniform rational B-spline curve. Further, setting each section of spline curve and control points meets preset geometric constraint conditions, including: The control points of each section of spline curve are odd numbers, and the middle control point is positioned on the radial symmetry axis of the bolt hole; The control points of each spline curve are symmetrically distributed about the radial symmetry axis; The spline curves at two adjacent ends are controlled to be collinear at the connecting point; And a gap which is not smaller than the radius of the bolt shaft is arranged between the bolt hole profile described by the spline curve and the bolt shaft. Further, describing a bolt hole contour structure by adopting at least two sections of spline curves connected end to end, including: and establishing a coordinate system by taking the center of the bolt shaft as a coordinate origin, wherein the two sample curves are respectively an upper part curve distributed in the first quadrant and the second quadrant and a lower part curve distributed in the third quadrant and the fourth quadrant, and the connection point of the two sample curves and the control point of the adjacent position are on the same straight line. Further, the engineering performance index comprises at least one of the following items, namely the maximum equivalent stress of the hole edge of the bolt hole, the maximum circumferential stress, the maximum main stress, the maximum radial displacement of the baffle plate and the compression area of the bolt. Further, the parameter optimization model comprises an optimization mathematical model and an optimization physical model, and parameter optimization is carried out based on the