Device and method for providing allowable assignment range of multiple parameters in computer aided design system

A computer-aided and design system technology, applied in calculation, calculation model, design optimization/simulation, etc., can solve problems such as difficulty in the effective range of multi-parameter assignment, high-dimensional space difficult for users to understand and use, and incomplete allowable range of parameter assignment. , to achieve the effect of being easy to understand and use, easy for users to understand, and ensuring completeness

Active Publication Date: 2021-12-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical applications, the complexity of most products will far exceed the back cover of the desktop computer case, so it is more difficult to obtain the effective assignment range of multiple parameters
Therefore, the problem of the allowable assignment range of multiple parameters has not been effectively resolved
For a large number of geometric constraint systems that cannot be decomposed into triangular subproblems, this type of constructive method cannot be applied
[0022] 2. Secondly, when it is necessary to calculate the allowable assignment range of multiple parameters in a two-dimensional model, this type of method will ignore some constraints, resulting in the incomplete allowable assignment range of the calculated parameters, so it is not suitable for solving the allowable range of multi-parameters. Assignment range
[0031] (2) This high-dimensional space is difficult to be directly understood and used by users
[0034] 1) All existing commercial CAD systems can provide mature geometric constraint solving functions; however, none of the commercial CAD systems can provide the user with the allowable value range of the parameter when editing the parameter
[0035] 2) A considerable amount of research has been accumulat

Method used

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  • Device and method for providing allowable assignment range of multiple parameters in computer aided design system
  • Device and method for providing allowable assignment range of multiple parameters in computer aided design system
  • Device and method for providing allowable assignment range of multiple parameters in computer aided design system

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0124] Example 1

[0125] According to an embodiment of the present invention, a device for providing multi-parametric allowed to provide a range of allowed assignment ranges is provided in a computer aided design system.

[0126] Image 6 It is a schematic diagram of an apparatus according to an embodiment of the present invention. like Image 6 As shown, the apparatus includes: acquisition unit 102, a first input unit 104, a first creation unit 106, a second input unit 108, and a second creating unit 110.

[0127] The acquisition unit 102 is used to acquire a two-dimensional model from a computer auxiliary design system, wherein the two-dimensional model comprises a plurality of geometric body and a plurality of two-dimensional geometric constraints of the geometric body, wherein the geometry has coordinate variables, two-dimensional geometric constraints. Has a dimensional parameter.

[0128] In this embodiment, according to Image 6 The device shown for providing multi-parametr...

Example

[0138] Example 1

[0139] Figure 7 A simple two-dimensional model is shown, which consists of multiple geometries, including three points P1, P2, P3, and dimensional parameters of distance constraints related to these three points. , and . Selected by the user, will and As the size parameters to be modified, and will As a fixed dimensional parameter. Among them, the algebraic equation group of the geometric constraint system is represented as follows:

[0140]

[0141] Among them, variables and The coordinates of P1, P2 and P3 are respectively, respectively. because For fixed size parameters, will Get into the algebraic equation, get:

[0142]

[0143] As an example rather than the limit, in order to ensure the integrity of the multi-parameter editing calculation parameter range, the constraint parameters will be modified Representation as the equality constraint function, as follows:

[0144]

[0145] To the two equity constraints, the Lagrangian multiplier is ...

Example

[0162] Example 2

[0163] Figure 9 A geometric constraint system consisting of three points P1, P2, and P3, wherein the three distance constraint parameters are D. 1 , D 2 And D 3 O represent the origin of the coordinate system. Point P1 is a known fixed point, the coordinate is (30, 0), and the direction of the P1 to P2 is in the X-axis direction, so that the Y coordinate value of point P2 is fixed to 0; and ,as well as D 1 It is the only way to modify the constraint parameters. Thus, the equation constraint function of the geometric constraint system in this example may be represented as follows:

[0164]

[0165] In the present embodiment, specifically, the first creating unit 106 solves the obtained final value domain interval based on each of the equation constraint functions corresponding to the size parameter to be modified, and separates the final value domain interval as the corresponding to the size parameters. Allow the assignment range, including the following st...

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Abstract

A device for providing an allowable assignment range of multiple parameters in a computer aided design system and a method thereof. The device comprises: an acquisition unit, which acquires a two-dimensional model from a computer-aided design system; a first input unit which is determined by a user to divide the size parameters of the two-dimensional geometric constraint in the acquisition unit into a fixed size parameter set and a to-be-modified size parameter set; a first creating unit which is used for calculating an allowable assignment range of each size parameter to be modified and displaying the allowable assignment range to a user; a second input unit which is used for selecting, editing and updating any size parameter to be modified by a user; a second creating unit which is used for updating the coordinate variables of the geometric body according to the parameter values of the size parameters of all the current geometric constraints, wherein the first creating unit is used for constructing a corresponding equality constraint function for each size parameter to be modified and solving to obtain a final value domain interval, and the final value domain interval is respectively used as an allowable assignment range of the corresponding size parameter to be modified.

Description

technical field [0001] The present invention mainly relates to the field of computer-aided design, in particular to a device and a method for providing an allowable value assignment range of multiple parameters in a computer-aided design system. Background technique [0002] Computer-aided design is a digital method that first creates corresponding 2D drawings and 3D models for products through computer-aided design software before actually producing real products. With computer-aided design software, users can simulate and modify designs, opening the door to rapid introduction of innovative and differentiated products. The development of computer-aided design software has roughly gone through several stages, including wireframe modeling design, curve surface modeling design, solid modeling design, and parametric design. Among them, the wireframe modeling design can only express the basic geometric information of the parts, but cannot effectively express the topological rel...

Claims

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Application Information

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IPC IPC(8): G06F30/25G06F17/11G06N3/00G06F111/04
CPCG06F30/25G06F17/11G06N3/006G06F2111/04
Inventor 汤志鸿高曙明邹强
Owner ZHEJIANG UNIV
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