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Digital flexible cable design method

A flexible cable and design method technology, applied in the field of virtual assembly, can solve the problems of inconsistent cable design length and spatial form, low efficiency, and failure to consider the large deformation characteristics of cable mechanics, and achieve the effect of improving the quality of cable design

Active Publication Date: 2020-06-19
DALIAN MARITIME UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its complex and large deformation mechanical properties, the layout optimization design of cables has always been a challenging issue.
The layout optimization design of early cables is to verify the design results by simulating the assembly process on the physical prototype. This test method is inefficient and heavily relies on manual experience.
With the development of computer-aided design technology and product digital prototype technology, it has become a common method for designers to use 3D CAD software to design cable wiring in a virtual environment, but the principle of these software is to fit the cable through the spline curve method. The geometric shape of the cable does not take into account the large mechanical deformation characteristics of the cable, resulting in the design length and spatial shape of the cable being inconsistent with the actual situation, thus affecting the quality of product design

Method used

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Embodiment 1

[0060] As shown in Figure 2, the present invention provides a cable digital modeling and calculation method, which can calculate the geometric shape of the cable under complex space constraints. Taking a certain copper cable as an example, select its physical parameters, and the The shape simulation analysis of the cable under different constraint conditions considering its own weight is carried out. Use the mathematical modeling platform AMPL to model the established optimization model based on different constraints, use the interior point method solver IPOPT to solve the established mathematical model, solve the Euler parameters of the cable section, and calculate the cable through the Euler parameters The position of the centerline and the bending torsion are processed by Matlab image analysis tool.

Embodiment 2

[0062] Such as image 3 As shown, the present invention provides a digital design method for flexible cables, including a method for quickly obtaining cable length, a cable static modeling technology, and a cable curved surface display method. Cable designers can use this cable digital wiring design method to determine the cable design scheme of the product, combine the product digital model and electrical schematic diagram, clarify the material usage and wiring relationship of the cable, and finally determine the cable wiring position based on the wiring specification. According to the routing position of a certain cable, the method can automatically give the preliminary routing length of the cable, and can quickly calculate the path of the cable in the background, and display the routing result of the cable in three dimensions. Cable designers can detect whether the cable interferes with rigid structural parts or other cables through the three-dimensional scene environment, ...

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Abstract

The invention discloses a digital flexible cable design method, which comprises the following steps of: determining a cable wiring and binding fixing position, taking the cable wiring and binding fixing position as a discrete input point in cable length design, and sequentially constructing a spline curve equation between adjacent discrete points; estimating the wiring length of the flexible cable, and integrating each curve segment along the arc length to obtain the length of the segment; taking the obtained cable wiring length and the cable cross section radius, elasticity modulus, Poisson'sratio and density information obtained according to the cable model as input parameters; a Cosserat elastic rod theory is adopted to carry out cable static modeling; determining cable spatial geometry, optimal modeling is carried out on the obtained cable statics model according to different space constraint conditions, a spline curve fitting method is adopted to construct a cable center line through discrete points according to obtained cable discrete input points, a curved surface is generated on a first point of the cable center line in the mode that a cross section scans along a path, andtherefore the smooth cable curved surface is rendered.

Description

technical field [0001] The invention relates to the technical field of virtual assembly, in particular to a digital design method for flexible cables. Background technique [0002] With the development of electromechanical products toward automation and mechatronics, the proportion of cables as the medium for power signal transmission in electromechanical products is increasing. The quality of cable layout will directly affect the service life and reliability of products. However, due to its complex and large deformation mechanical properties, the layout optimization design of cables has always been a challenging topic. The layout optimization design of early cables is to verify the design results by simulating the assembly process on the physical prototype. This test method is inefficient and relies heavily on manual experience. With the development of computer-aided design technology and product digital prototype technology, it has become a common method for designers to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/39G06F113/16G06F119/14
CPCY02E60/00
Inventor 度红望王泽怡吕昊熊伟王海涛孙长乐
Owner DALIAN MARITIME UNIVERSITY