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A Fast and Accurate Calculation Method for the Section and Mass Properties of a Rotating Body

A technology of quality attributes and calculation methods, which is applied in complex mathematical operations, geometric CAD, special data processing applications, etc., and can solve problems such as loss of solution accuracy and slow solution speed.

Active Publication Date: 2020-04-28
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of slow solution speed and loss of solution accuracy in the process of solving the cross section and mass attributes of a rotary body, and provide a fast and accurate calculation method for the cross section and mass attributes of a rotary body,

Method used

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  • A Fast and Accurate Calculation Method for the Section and Mass Properties of a Rotating Body
  • A Fast and Accurate Calculation Method for the Section and Mass Properties of a Rotating Body
  • A Fast and Accurate Calculation Method for the Section and Mass Properties of a Rotating Body

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Embodiment Construction

[0085] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0086] see figure 1 , the fast and accurate calculation method for the section and mass properties of the rotary body of the present invention includes the following steps:

[0087] Step 1: Preprocess the CAD drawings of the section of the rotating body;

[0088] like figure 2 As shown, the specific method of step 1 is as follows:

[0089] Make the axis of the revolving body coincide with the x-coordinate axis (it can also coincide with other axes, all formulas in the present invention are completed with reference to the coincidence of the axis and the x-coordinate axis), and the scale of the drawing is scaled to 1:1. Section lines, dimensions, annotations, axes, etc., delete the part of the section in the third and fourth quadrants. And then generate DXF format file;

[0090] Step 2: Import and parse the CAD drawing file in DXF format to obtain the data of line...

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Abstract

The invention discloses a method for rapidly and precisely calculating the section and the mass attribute of a revolving body. By means of the method, attribute parameters of the revolving body, suchas the sectional area, the mass, the gravity centre axial position, the polar rotational inertia and the diameter rotational inertia, are calculated rapidly and accurately according to information ofthe revolving body, such as the sectional view and the material density. According to the method, after the CAD drawing of the pre-processed section of the revolving body is imported, starting pointsof various line segments on the section boundary are sequentially extracted in the counter-clockwise direction; a section boundary node coordinate set is obtained; and thus, various attribute parameters are calculated according to a formula obtained by derivation. According to the method in the invention, the two-dimensional surface integral and the three-dimensional volume integral of the revolving body can be converted into one-dimensional line integrals; the integral difficulty due to the irregular shape of the revolving body and the like can be avoided; calculation is relatively rapid; furthermore, only section boundary information is needed; precision loss of pixelated subdivision is avoided; and calculation is relatively precise.

Description

technical field [0001] The invention belongs to the technical field of digital mechanical design, and relates to a fast and accurate calculation method for the section and mass properties of a rotary body. Background technique [0002] Rotordynamics calculation of machine tool spindles, aero-engines and other mechanical products is a key link in the design and analysis process. In the calculation, it is necessary to input the attribute parameters such as the mass, the axial position of the center of gravity, the polar moment of inertia, and the diameter moment of inertia of each rotating body part. At present, the main CAD software integration method is used to solve these parameters, that is, firstly, the revolving body is divided into tiny regular shapes, and then the tiny shapes are calculated separately and then accumulated and superimposed. This method often involves the solution of two-dimensional and three-dimensional volume fractions. The calculation results in a hu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/17G06F17/16
CPCG06F17/16G06F30/17
Inventor 裴世源孙岩辉洪军郭俊康苗强南凯刚
Owner XI AN JIAOTONG UNIV
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