Tension Support Tube Deflection Control
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Solution Overview
Problem
Magnetic levitation transportation systems with vacuum tubes experience tube deflections due to vehicle travel, causing passenger discomfort, and existing solutions like increasing tube strength or reducing support column spacing are costly or inefficient.
Innovation Solution
A transportation system using tension supports that couple the tube to the ground, exerting tension forces to reduce deflections, with a tension control unit adjusting tension based on vehicle position and weight, and incorporating a vacuum channel to minimize aerodynamic drag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the tube diameter is increased to reduce deflections, then the bending moment of inertia is increased and deflections are reduced, but the weight of the tube increases and cost increases
Solution Approach 1:
The tube is pre-stressed with tension cables before the vehicle arrives. This preliminary action creates an initial tensile force in the tube that counteracts the downward deflection caused by the vehicle's weight, reducing the need for excessive tube thickness or weight
Solution Approach 2:
The patent changes the stress state of the tube from purely compressive (when supported only by columns) to a combination of compressive and tensile stresses by applying pre-tension. This parameter change allows the tube to better resist deflection without increasing its weight
2Device complexity
If support columns are spaced farther apart to reduce the number of supports, then system cost is reduced, but tube deflections increase significantly
Solution Approach 1:
Tension cables are installed and pre-stressed between support columns before the tube is fully supported by the columns. This preliminary tensioning creates a stiffened structure that can span longer distances without excessive deflection, allowing fewer support columns to be used
Solution Approach 2:
The system creates a composite structure combining the tube, tension cables, and support columns. The tension cables act as a tensile reinforcement that works together with the compressive tube to create a more efficient load-bearing system capable of longer spans
3Stability of the object's composition
If tubes are placed below ground through tunneling to eliminate support columns, then deflections are eliminated, but construction cost increases substantially
Solution Approach 1:
Instead of placing tubes below ground to eliminate support needs, the patent inverts the approach by placing tubes above ground and using tension cables to eliminate the need for frequent support columns. This achieves the deflection reduction goal while avoiding expensive tunneling
Solution Approach 2:
The patent extracts the support function from traditional compression-based support columns and replaces it with tension-based cable supports. This extraction allows for longer spans and reduced construction cost while maintaining deflection control
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 system effectively reduces tube deflections while maintaining efficiency and cost-effectiveness by using lighter and smaller tension supports, and a vacuum channel to enhance vehicle speed and operational efficiency.
Implementation Method 1
The tension support(s) exerts tension force into the tube. The tension force exerted into the tube reduces deflection of the tube when the vehicle travels through the interior channel
Implementation Method 2
a vacuum channel to enhance vehicle speed and operational efficiency
Implementation Method 3
the vacuum tube reduces aerodynamic drag
Data Source
AI summary
A transportation system includes a tube defining an interior channel. A vehicle is configured to travel through the interior channel. At least one tension support couples the tube to ground. The tension support(s) exerts tension force into the tube. The tension force exerted into the tube reduces deflection of the tube when the vehicle travels through the interior channel over the tension support(s).