Tow Cable Termination With Universal Joint Articulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tow cable terminations fail to sustain tensile loads and prevent catastrophic failure during high-speed towing, especially in unstable decoy conditions or high 'G' maneuvers, due to limited articulation and inability to manage lateral forces, restricting the flight envelope of aircraft.
Innovation Solution
A tow cable termination system featuring a closed eye bolt and U-bolt arrangement with high articulation capabilities up to ±90 degrees, allowing for the transmission of tensile loads without lateral forces, and incorporating a cable barrel with resin potting and low friction coatings for dynamic stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid cable termination is used to sustain tensile loads, then the cable can transmit loads effectively, but the termination cannot accommodate large angular deviations (±90 degrees) without transmitting lateral forces that cause cable flexure and failure
Solution Approach 1:
The cable termination is divided into separate functional segments: a rigid load-bearing component that sustains tensile forces and a flexible articulation mechanism (universal joint) that accommodates angular deviations. This segmentation allows each part to specialize in its function without compromising the other.
Solution Approach 2:
A universal joint acts as an intermediary element between the rigid cable termination and the towed object. This intermediary component absorbs and accommodates lateral forces and angular deviations, preventing them from being transmitted to the cable while allowing the rigid termination to maintain its load-bearing capability.
2Adaptability or versatility
If a flexible cable termination with high articulation capability is used to accommodate ±90 degree angular deviations, then the cable can move freely, but it becomes unable to sustain high tensile loads without failing
Solution Approach 1:
The system separates the articulation function from the load-bearing function. The universal joint provides the flexible articulation capability for large angular deviations, while the rigid cable termination structure maintains the strength required to sustain high tensile loads.
Solution Approach 2:
The universal joint serves as a mediator that handles lateral forces and angular movements, protecting the cable and termination from these destabilizing forces while allowing the rigid components to focus on sustaining tensile loads effectively.
3Strength
If the cable termination is designed with limited articulation (±30 degrees) to maintain structural integrity, then the termination can sustain tensile loads, but the cable must flex near the tip which leads to catastrophic failure
Solution Approach 1:
The universal joint acts as a protective intermediary that absorbs lateral forces and angular deviations before they can reach the cable. This prevents the cable from experiencing flexure and fatigue near its termination point, thereby preventing catastrophic failure and extending cable life.
Solution Approach 2:
The universal joint provides beforehand cushioning by accommodating lateral forces and angular movements in advance, preventing these forces from being transmitted to the cable and causing fatigue damage that would lead to failure.
4Reliability
If a complex cable termination system is used to achieve high articulation and sustain tensile loads, then the cable can operate in high vortex environments, but the device complexity increases
Solution Approach 1:
The cable termination incorporates a universal joint that provides dynamic adaptability, allowing the structure to automatically adjust to varying angular deviations and lateral forces encountered in high vortex environments. This dynamic capability is achieved through a relatively simple mechanical joint rather than a complex active control system.
Solution Approach 2:
The universal joint serves as a passive intermediary mechanism that handles the complexity of accommodating large angular deviations and lateral forces, allowing the rest of the cable termination to remain relatively simple while still achieving reliable operation in high vortex environments.
Data Source
AI summary
A specialist tow cable termination for sustaining the tensile load when an object is towed at high speeds at the end of an cable behind an aircraft, the termination comprises a closed eye bolt attached to the cable and a U-bolt looped through the eye bolt attached to the object. The arrangement allows significant pivoting bending stresses to the tow cable.