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Mechanical part circular bead structure shape optimization method

A technology of mechanical parts and optimization methods, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as poor practicability

Active Publication Date: 2015-01-07
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the shortcomings of poor practicability of the existing methods for optimizing the shape of rounded corners of mechanical parts, the present invention provides a method for optimizing the shape of rounded corners of mechanical parts

Method used

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  • Mechanical part circular bead structure shape optimization method
  • Mechanical part circular bead structure shape optimization method
  • Mechanical part circular bead structure shape optimization method

Examples

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Embodiment 1

[0064] Embodiment 1: Optimizing the shape of the shoulder fillet structure in Document 1. The shaft is a structure of revolution, so only the meridian plane of the shaft can be considered. In order to simplify the calculation, the model is analyzed using the axisymmetric analysis method. In this embodiment, double-arc curves are used to optimize the shape of the shoulder fillet structure. Unless otherwise specified, the unit of length in this embodiment is mm, and the unit of angle is rad. For the sake of brevity, the text will not mark them one by one.

[0065] (a) According to the overall structural size of the shaft, in order to facilitate the use of the axisymmetric analysis method, the symmetric axis of the shaft must be consistent with the y-axis of the global Cartesian coordinate system, and the global Cartesian coordinate system x is established accordingly 0 Oy 0 , select the starting point P of the double arc 1 0 and endpoint P 2 0 , P 1 0 and P 2 0 In the ...

Embodiment 2

[0102] Embodiment 2: Optimizing the shape of the rounded corner structure of the flat plate with rounded corners in Document 2. Due to the symmetry of the flat plate structure with rounded corners, in order to simplify the calculation, a quarter of the structure is taken for analysis, and the shape optimization design of the rounded corner structure is carried out using double arc curves. Unless otherwise specified, the unit of length in this embodiment is mm, and the unit of angle is rad. For the sake of brevity, the text will not mark them one by one.

[0103] (a) According to the overall structure size of the flat plate with rounded corners, take a quarter model of the lower left corner of the structure for analysis, and establish a global Cartesian coordinate system x 0 Oy 0 , select the starting point P of the double arc 1 0 and endpoint P 2 0 , P 1 0 and P 2 0 In the global Cartesian coordinate system x 0 Oy 0 The coordinates in ( ...

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Abstract

The invention discloses a mechanical part circular bead structure shape optimization method which is used for solving the technical field that the existing mechanical part circular bead structure shape optimization method is poor in practical. According to the technical scheme, a global rectangular coordinate system is constructed according to the integral structural size of a mechanical part; drawing a multi-arc curve according to starting points and terminal points of double arcs under the global rectangular coordinate system, obtained connecting points, coordinates of a center of a circle and semi-diameter information of the sections of arcs; enabling the drawn double-arc curve to be served as a circular bead curve; selecting coordinate components of coordinates of the starting points and the terminal points of the double arcs and angels of anticlockwise rotation of chord vectors of the double arcs to be coincided with a common tangent of the double arcs to be served as optimization design variable; performing finite element modeling, analysis and sensitivity solution and obtaining an optimized double-arc curve type circular bead structure. The mechanical part circular bead structure shape optimization method can effectively optimize the circular bead structure of the mechanical part, improve the structural performances of the mechanical part and is beneficial to numerical control machining and strong in engineering practicability.

Description

technical field [0001] The invention relates to a method for optimizing the shape of a mechanical part, in particular to a method for optimizing the shape of a rounded corner structure of a mechanical part. Background technique [0002] In the manufacturing fields of aerospace, ships, automobiles, etc., due to the needs of installation, positioning, bearing, weight reduction and even aesthetics, many mechanical parts are designed with rounded corner structures, and the rounded corner structure will cause stress concentration and reduce the use of parts life. In the traditional design method, considering the feasibility of cutting, the shape of the rounded structure is usually designed with a single quarter arc curve. Although this design method reduces the degree of stress concentration to a certain extent, it is blind Large, often can not achieve the desired effect. [0003] Document 1 "Shi X, Mukherjee S. Shape optimization in three-dimensional linear elasticity by the b...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 牛草张卫红蔡守宇刘虎
Owner NORTHWESTERN POLYTECHNICAL UNIV
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