Tie-Down Strap Fairing for Vortex-Induced Vibration Reduction
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Solution Overview
Problem
Cargo straps used to secure loads in open vehicles are prone to degradation due to vortex-induced vibration caused by wind, leading to reduced lifespan and potential cargo displacement, with existing solutions mainly focused on marine environments and lacking applicability to land vehicles.
Innovation Solution
A fairing with a V-shaped frontal geometry is designed to be removably positioned around the strap, streamlining air flow and reducing drag, thereby minimizing vortex-induced vibration and strap degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cargo is transported openly in a vehicle using straps, then cargo securing is achieved, but the straps experience vortex-induced vibration from wind causing degradation and reduced lifespan
Solution Approach 1:
A fairing is introduced as an intermediary aerodynamic structure that wraps around the strap. This fairing mediates the interaction between the strap and wind flow, streamlining the air flow and eliminating vortex formation. The fairing protects the strap from direct wind exposure while maintaining the strap's cargo-securing function.
Solution Approach 2:
The fairing employs a curved, streamlined geometry with a rounded leading edge and tapered trailing edge. This curved design allows air flow to smoothly follow the contour of the fairing, preventing flow separation and vortex generation that would otherwise occur around a straight strap, thereby reducing vibration and drag.
2Device complexity
If traditional strap design is used, then simplicity is maintained, but drag and vibration increase leading to faster degradation
Solution Approach 1:
The fairing uses a streamlined curved shape with a rounded leading edge and tapered trailing edge that allows smooth air flow attachment. This aerodynamic contour minimizes flow separation and vortex formation, significantly reducing drag and vibration forces acting on the strap system.
Solution Approach 2:
The fairing is constructed as a thin-walled aerodynamic shell that can be made from flexible materials such as fabric, plastic, or metal. This thin-shell structure provides the necessary aerodynamic protection while maintaining low weight and minimal impact on the overall strap system complexity.
3Device complexity
If straps are exposed to wind without protection, then no additional components are needed, but strap lifespan is reduced due to continuous vibration and degradation
Solution Approach 1:
The fairing serves as a protective intermediary between the wind environment and the strap. By wrapping around the strap, it shields the strap from direct aerodynamic loading, vortex-induced vibration, and environmental exposure, thereby extending the strap's service life without requiring fundamental changes to the strap itself.
Solution Approach 2:
The streamlined curved geometry of the fairing enables smooth air flow transition around the strap, preventing turbulent flow and vortex shedding that cause vibration and fatigue. This aerodynamic shaping significantly reduces the mechanical stresses on the strap, extending its operational lifespan.
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 fairing effectively reduces strap vibration and degradation, extending the useful life of cargo securing straps and preventing cargo displacement, while also avoiding fines associated with frayed straps.
Implementation Method 1
degradation of the straps due to the effects of the impingement of air on the straps... degradation of elongated securement or connection members by vortex-induced vibration caused by fluid flow
Implementation Method 2
the flow of air is streamlined around the strap... provides for fluid (air) particle separation in a smooth transition in front of the strap, thereby reducing drag
Data Source
AI summary
Embodiments of a fairing of the present invention generally include a pair of fins that intersect at a first closed end thereof forming a V-shaped/pointed frontal geometry and are connectable at a second end thereof via a fin connection assembly, wherein the fairing is adapted and configured to be engaged about at least a portion of a tie-down strap that is securing a cargo object to a cargo support structure, wherein the first closed end is directionally oriented such that air flow resulting from transportation of the cargo object impinges thereupon, and wherein the first closed end geometry is adapted and configured to shield the tie-down strap from excessive vibration during transportation of the cargo object. Embodiments of a method of using embodiments of fairings of the present invention are also provided.