Triangle Weld Joint for Inflatable Structure Panel Pillowing
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Solution Overview
Problem
Conventional T-welds in inflatable structures cause 'pillowing' of panel walls, resulting in an undulating external surface due to inadequate prevention of outward bowing when inflated, and uneven distribution of material stress.
Innovation Solution
The 'triangle weld' joint, formed by a folded center strip and side strips fused to the panel walls, distributes stress more evenly and flattens the exterior surface by using a triangular configuration that expands under air pressure, connecting internal spars and baffles securely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional T-weld is used to connect internal spars and baffles to panel walls, then the connection strength is improved, but the panel wall surface becomes undulating and pillowed
Solution Approach 1:
The invention transitions from a two-dimensional T-weld configuration to a three-dimensional triangular wedge configuration. The triangular wedge has depth and volume, allowing it to span the gap between spars and maintain panel flatness while providing structural support. This dimensional change enables the joint to function both structurally and aesthetically.
Solution Approach 2:
The triangular wedge is formed by folding and heat-sealing fabric strips into a curved, three-dimensional shape rather than a flat T-junction. This curvature allows the material to conform to the panel wall surface while maintaining structural integrity, preventing the pillowing effect caused by rigid flat T-welds.
2Stability of the object's composition
If a conventional T-weld is used to connect internal spars and baffles, then the structural integrity is improved, but the material stress distribution becomes uneven
Solution Approach 1:
The triangular wedge is constructed from multiple folded and heat-sealed strips of fabric that work together to distribute loads. The segmented structure of overlapping strips and heat-sealed joints creates multiple load paths,分散ing stress throughout the joint rather than concentrating it at a single T-junction point.
3Reliability
If internal spars and baffles are sewn or heat fused to wall panels using T-welds, then the connection reliability is improved, but the external surface aesthetics deteriorate
Solution Approach 1:
The triangular wedge acts as an intermediary element between the internal spars and the external panel wall surface. It provides a structural connection point while its three-dimensional form and surface treatment allow it to blend with the surrounding panel, hiding the joint from external view and maintaining aesthetic appearance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The triangle weld reduces panel wall 'pillowing' and achieves a flatter exterior surface while evenly distributing material stress, enhancing structural integrity and aesthetics in inflatable structures.
Implementation Method 1
The fabric strips are heat sealed together in a triangular configuration
Implementation Method 2
When inflated, the internal air pressure within the structure expands the center strip and spaces the side sections away from the middle section
Data Source
AI summary
A material joint connecting an internal spar or baffle to panel walls of inflatable structures. The material joint is formed by a folded center strip and a pair of side strips. The side edges of the center strip are folded to form an initial “T-shaped” cross-section having a middle section, two side sections formed by a first bend, and two overlapping end sections formed by a second bend. The middle section is fused directly to the facing surface of the panel wall and the overlapping end sections are fused together to extend perpendicularly from the middle section. The end strips overlap the center strip with part of the end strips fused to the side sections of the center strip and part fused directly to the panel wall. The spar or baffle is connected to the fused overlapping end sections of the center strip. Under the internal air pressure of the inflated structure, the side sections bow and arc under tension from the connected spar or baffle and the middle section acts as a “bridge” to lift and flatten the exterior surface of the panel wall across its width.