Flexible Power Generation Module Group Stress Distribution
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Solution Overview
Problem
Folding sheet-like power generation devices face increased load on partition lines, leading to reduced durability and portability issues when folded.
Innovation Solution
A power generation module group with flexible sheets and power generation panels arranged in a specific configuration, allowing for compact folding without forming a folding line on the sheet, utilizing acute angles and line symmetries to distribute stress and reduce the load on the sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a folding line is formed as a groove of predetermined depth in a sheet to enable folding, then the sheet-like power generation device can be folded for portability, but the durability of the sheet decreases due to increased load on the partition line
Solution Approach 1:
The sheet is divided into multiple regions by partition lines that extend only partially through the thickness, creating segmented zones that can flex independently. This segmentation allows the sheet to be folded without concentrating stress along a single continuous groove, thereby maintaining durability while enabling portability.
Solution Approach 2:
The partition lines have different penetration depths at different locations - shallower in critical stress areas and deeper in less critical areas. This local variation in groove depth optimizes the balance between foldability and structural integrity, reducing overall load on the sheet while maintaining folding capability.
2Volume of moving object
If a folding line is formed in a sheet to enable folding, then the power generation device can be compacted for portability, but the load on the partition line increases reducing durability
Solution Approach 1:
The partition lines are designed with curved profiles rather than sharp angular grooves, distributing stress more evenly across the fold region. The curved geometry reduces stress concentration at the partition lines, allowing the sheet to be folded into compact forms without compromising the strength of the partition structures.
3Ease of operation
If partition lines are formed deeply in the sheet to create clear folding lines, then folding is easier, but the sheet durability decreases
Solution Approach 1:
The partition lines extend only partially through the sheet thickness rather than completely, providing just enough depth to guide folding while leaving sufficient material intact to maintain sheet strength and longevity. This partial penetration approach achieves adequate folding ease without the excessive material removal that would compromise lifespan.
Data Source
AI summary
The power generation module group 1 includes a sheet 10 and power generation panels 21 to 24. First lines L1 and L1′ are present between the panels 21 and 22 adjacent to each other in the lateral direction, the first lines crossing neither the panels 21 nor 22 and coming in contact with both the panels 21 and 22. The second line L2 is present on the bottom side of the panel 21 and on the bottom side of the panel 22, crosses neither the panels 21 nor 22 and is parallel in the lateral direction. An angle θ1 that is the largest angle on the panel 22 side of angles formed by the second line L2 and the first lines L1 and L1′ is an acute angle. The panels 23 and 24 are disposed in line symmetry with the panels 21 and 22, respectively, with respect to the lateral direction.