Cable Packaging Fairings for Autonomous Strumming Mitigation
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Solution Overview
Problem
Controlling the shape of a vertical line array in the presence of a cross flow current in liquid is challenging, leading to cable strumming that negatively impacts acoustic performance, and existing mitigation methods increase deployment complexity and risk.
Innovation Solution
A low SWAP solution for deploying acoustic line arrays with strumming mitigation by packaging cables with tabs that ensure reliable, autonomous deployment in any orientation, using thermoplastic sheets and pegs to form fairings that mitigate strumming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional methods are used to maintain vertical line array in cross flow current by increasing tension with large float and terminal weight, then the vertical line array stability is improved, but cable strumming is introduced and exacerbated which deteriorates acoustic function
Solution Approach 1:
The cable is segmented into multiple sections with fairings attached at intervals along its length. Each fairing acts as an independent strumming mitigation element, dividing the continuous cable into functional segments that collectively reduce strumming without requiring excessive tension
Solution Approach 2:
Fairings serve as intermediary elements between the cable and the cross flow current. These fairings intercept the flow and reduce direct interaction between the current and the cable, thereby mitigating strumming while maintaining array stability without needing large floats or weights
2Object-generated harmful factors
If treatments are applied to cable to mitigate strumming by adding mass or altering cross section, then strumming mitigation is achieved, but deployment complexity increases and deployment failure risk increases
Solution Approach 1:
Fairings are pre-attached to the cable during manufacturing in a controlled environment. This preliminary action ensures proper positioning and secure attachment without requiring complex deployment procedures or special handling during field deployment
Solution Approach 2:
The fairings are designed as simple, lightweight structures that can be easily manufactured and attached. They function as disposable or single-use elements that provide strumming mitigation without adding significant complexity to the overall system or deployment process
3Object-generated harmful factors
If tabs are added to vertical line array to reduce strumming, then strumming mitigation is achieved, but packaging cable for autonomous deployment becomes challenging and unreliable
Solution Approach 1:
The fairings are designed to nest within each other or collapse into a compact configuration during packaging. This nesting allows multiple fairings to be stored in a small space on the cable without preventing autonomous deployment
Solution Approach 2:
The fairings transition from a compact, packaged state to an extended, operational state during deployment. This dynamic transformation allows the fairings to be stored efficiently during transport and then automatically deployed to their functional positions when needed
Data Source
AI summary
A cable package for a line array and a method thereof including a first sheet of material, a cable wound in a serpentine shape, where a portion of the cable contacts the first sheet of material, and a second sheet of material attached to the cable and areas of the first sheet of material not occupied by the cable, wherein areas of the second sheet of material attached to the first sheet of material not occupied by the cable comprises scoring lines to enable separation under tension to form a plurality of strumming mitigation fairings, and wherein the cable with scoring lines in the areas of the second sheet of material attached to the first sheet of material not occupied by the cable is folded onto itself.