Evacuated Tube Section with Skeletal Framework for Buckling Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing evacuated tube transport systems face challenges in producing large-diameter tubes that are lightweight, resistant to buckling, and can be easily transported and assembled, due to the high material requirements and structural limitations of conventional steel tubes.
Innovation Solution
A tube section design comprising a skeletal framework of longitudinal stringers and circumferential sections with curved skin sections mounted in tension, allowing for efficient use of materials and resistance to external pressure, enabling easier assembly and transportation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional steel plate or strip is used to produce large-diameter tubes, then sufficient strength and buckling resistance are achieved, but the tube weight increases significantly and material handling becomes cumbersome
Solution Approach 1:
The tube structure is segmented into a skeletal framework consisting of longitudinal stringers and circumferential rings, with skin panels filling the spaces between. This segmentation allows the structure to achieve required strength through the framework while using thinner, lighter skin panels, reducing overall weight compared to solid steel plate construction.
Solution Approach 2:
The tube employs a composite structure combining the skeletal framework (longitudinal stringers and circumferential rings) with skin panels. This composite approach allows optimization of each component's thickness and material properties, achieving sufficient structural strength with reduced overall material usage and weight.
2Reliability
If tube wall thickness is increased to 30 mm for large-diameter tubes, then buckling resistance and pressure withstand capability are improved, but manufacturing complexity and assembly difficulty increase
Solution Approach 1:
Instead of using a single thick wall, the structure segments the load-bearing function into the skeletal framework (stringers and rings) which provides buckling resistance, while the skin panels provide enclosure. This allows thinner individual components that are easier to manufacture and handle.
Solution Approach 2:
The circumferential rings and longitudinal stringers create a curved, ribbed structure that inherently resists buckling through geometric stability. The curvature and rigid framework provide structural integrity without requiring excessive wall thickness, improving manufacturability.
3Stress or pressure
If large-diameter tubes are produced with sufficient thickness for structural integrity, then pressure differential resistance is improved, but transportation and on-site assembly become impractical
Solution Approach 1:
The tube is divided into modular segments (framework components and skin panels) that can be transported separately and assembled on-site. This segmentation reduces individual component size and weight for transportation while maintaining overall structural integrity when assembled.
Solution Approach 2:
The skin panels use thin-walled construction that is flexible enough for easy handling and transportation but, when assembled within the rigid skeletal framework, provides sufficient pressure differential resistance for the evacuated tube application.
4Stability of the object's composition
If solid steel plate construction is used for large-diameter tubes, then structural stability is achieved, but material usage and cost increase significantly
Solution Approach 1:
The structure segments the load-bearing function into the skeletal framework which provides structural stability through its rigid geometry, while the skin panels provide enclosure with minimal material. This eliminates the need for excessive solid steel plate while maintaining stability.
Solution Approach 2:
The composite structure of framework plus skin panels optimizes material usage by assigning different functions to different components: the framework provides structural stability and buckling resistance, while the thin skin panels provide atmospheric pressure containment with minimal material.
Data Source
AI summary
A tube section for constructing a tube for underpressure applications with an incircle having a diameter of at least 2 m and to an evacuated tube transport system tube produced therefrom.