Loop Simulation System for Knitted Fabric Stitch Positioning
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Solution Overview
Problem
Existing loop simulation methods rely heavily on empirical rules, making it difficult to accurately simulate three-dimensional structures like bulging and curling in knitted fabrics, particularly in patterns such as pin tuck, and struggle to represent the complex geometry of knitted fabrics effectively.
Innovation Solution
A method and apparatus that determine the position of each stitch in a knitted fabric by calculating deviations in tension, distortion angles, and bending angles about the course and wale axes, allowing for realistic simulation of three-dimensional structures by shifting stitch positions based on these calculated values, thereby reducing reliance on empirical rules and improving geometric accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If empirical rules are used to determine stitch positions, then the calculation process is simple, but the simulation accuracy of three-dimensional structures is poor
Solution Approach 1:
The patent transforms the stitch position determination from empirical rules to a systematic parameter-based approach. It defines five specific parameters (tension, distortion angle, bending angle about course axis, bending angle about wale axis, and stitch position) that collectively describe the three-dimensional state of each stitch. By changing from qualitative empirical judgment to quantitative parameter calculation, the system achieves both computational feasibility and high simulation accuracy for complex knitted fabric structures.
Solution Approach 2:
The patent replaces the mechanical/empirical rule-based system with a mathematical model. Instead of relying on experience-based rules to determine stitch positions, the system uses calculated parameters derived from geometric relationships and physical principles. This substitution allows for precise, repeatable, and automated determination of stitch positions that accurately represent three-dimensional knitted fabric structures.
2Manufacturing precision
If detailed geometric parameters are calculated for each stitch, then the simulation realism is improved, but the calculation load increases
Solution Approach 1:
The patent segments the complex problem of three-dimensional stitch positioning into five independent but interrelated parameters. Each parameter (tension, distortion angle, bending angles, position) addresses a specific aspect of stitch behavior. This segmentation allows the calculation to be performed systematically for each parameter rather than attempting to solve the entire complex geometry problem at once, reducing the computational burden while maintaining overall simulation realism.
Solution Approach 2:
The patent applies different calculation approaches to different aspects of stitch positioning. Each of the five parameters is determined based on its specific local requirements - for example, tension relates to distance from adjacent stitches, while bending angles relate to orientation relative to course and wale directions. This localized parameter determination allows efficient calculation by addressing each geometric aspect with the most appropriate method rather than using a single complex formula for all aspects.
3Ease of operation
If empirical rules are used, then the method is easy to implement, but it cannot simulate bulging patterns like pin tuck
Solution Approach 1:
The patent creates a universal parameter system that can handle multiple knitted fabric patterns and three-dimensional structures through the same five parameters. Whether simulating pin tuck patterns with bulging effects, curling edges, or flat fabrics, the system uses the same tension, distortion angle, bending angle, and position parameters. This multi-functional approach eliminates the need for different empirical rules for different patterns while maintaining ease of implementation through systematic calculation.
Data Source
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AI summary
Shift of each stitch in a fabric is repeated and converged to eliminate the difference between distances to surrounding stitches and a default value, the deviation of an angle formed by a line connecting the right/left stitches and a line connecting the upper/lower stitches from 90°, the difference of an angle formed by the right/left stitches formed