Sewing Analysis System Stiffness Modeling
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Solution Overview
Problem
Conventional sewing simulation methods fail to accurately represent the change in stiffness of cloth around a stitching line due to seam allowance folding and do not allow for flexible adjustment of stitching pitch without compromising analysis accuracy.
Innovation Solution
A sewing analysis system that includes a sewing instruction unit for providing alignment positions, seam allowance widths, and stitching pitch instructions, a cloth mesh creation unit, a temporary stitching line creation unit, a beam element creation unit, a spring element connection unit, and a seam allowance folding setting unit to model the sewing process, allowing for independent handling of stitching lines and cloth meshes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the paper pattern is divided into very small polygonal elements for conventional sewing simulation, then the accuracy of cloth analysis is improved, but the stitching pitch cannot be changed and the seam allowance folding effect cannot be represented
Solution Approach 1:
The invention divides the cloth into mesh elements and the stitching line into discrete beam elements spaced at a specified pitch. This segmentation allows the stitching pitch to be independently adjusted without changing the cloth mesh density, resolving the contradiction between analysis accuracy and stitching pitch flexibility. The beam elements are distributed along the stitching line at user-defined intervals, enabling versatile pitch adjustment while maintaining accurate cloth representation.
Solution Approach 2:
The invention extracts the seam allowance region from the cloth mesh and applies folding loads specifically to this extracted region. By separating the seam allowance handling from the general cloth analysis, the system can accurately represent the folding effect and stiffness change without compromising the overall mesh accuracy or stitching pitch flexibility.
2Device complexity
If seam allowance folding is not taken into consideration in conventional sewing simulation, then the simulation process is simpler, but the change in stiffness of cloth around stitching line cannot be represented and wrinkles cannot be appropriately represented
Solution Approach 1:
The invention applies folding loads to the seam allowance region before the actual sewing simulation is executed. This preliminary action pre-establishes the folded configuration and associated stiffness changes, allowing the main simulation to proceed without complex real-time folding calculations while still achieving accurate stiffness representation and wrinkle prediction.
Solution Approach 2:
The invention applies different mechanical properties and loading conditions specifically to the seam allowance region compared to the rest of the cloth. By making the stiffness and boundary conditions local to the folded seam area, the system accurately captures the localized stiffness change without requiring the entire simulation model to be overly complex.
3Measurement precision
If the stitching pitch depends on the number of divisions into very small elements, then the cloth mesh accuracy is maintained, but the stitching pitch cannot be changed independently
Solution Approach 1:
The invention segments the stitching line into independent beam elements that are placed at user-specified pitch intervals, separate from the cloth mesh divisions. This independent segmentation allows the stitching pitch to be adjusted freely without affecting the cloth mesh accuracy, as the beam elements simply sample the existing mesh at the desired spacing.
Solution Approach 2:
The invention makes the stitching pitch a dynamic, user-adjustable parameter rather than a fixed value determined by mesh density. The system allows the stitching pitch to be changed independently of the mesh configuration, enabling flexible operation while maintaining accurate cloth analysis through the underlying mesh structure.
Data Source
AI summary
A sewing analysis system includes: a sewing instruction unit, providing an instruction on an alignment position of a stitching line, seam allowance widths, and a stitching pitch; a cloth mesh creation unit, creating cloth meshes; a temporary stitching line creation unit, creating a temporary stitching line; a beam element creation unit, creating a beam element on the temporary stitching line; a spring element connection unit, connecting the beam elements of first paper pattern outer shape data and second paper pattern outer shape data by spring elements; a spring element connection unit, connecting the beam elements and the cloth meshes; and a seam allowance folding setting unit, folding seam allowances by applying loads in opposite directions respectively to the stitching lines and to peripheral edges on sides of the stitching lines of the first paper pattern outer shape data and second paper pattern outer shape data.