Non-conductive Tether Cable for Lightning-Resistant Aerostats
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Solution Overview
Problem
Tethered aerial vehicles face challenges in maintaining continuous operations due to the attraction of atmospheric discharges, as existing protection systems, such as copper layers in cables, are heavy and impractical for larger aerostats, limiting their use in weather conditions prone to lightning.
Innovation Solution
A non-conductive tethering cable with a mechanical support fiber and gas tube, optionally including fiber optics, that uses hydrogen or helium for lifting and power generation via an on-board fuel cell, reducing the risk of attracting atmospheric discharges and enabling prolonged operations without the need for frequent ground supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a copper protection layer is added to the cable to protect against lightning, then the protection effectiveness is improved, but the cable weight increases significantly
Solution Approach 1:
The patent changes the electrical conductivity parameter of the cable by using non-conductive materials (polymer insulation, plastic coating) instead of conductive copper layers. This parameter change eliminates lightning attraction while maintaining protection through electrical isolation, resolving the contradiction between protection effectiveness and weight.
Solution Approach 2:
The patent extracts the copper protection layer from the cable structure and replaces it with non-conductive materials. This extraction removes the harmful conductive property that attracts lightning while keeping the cable lightweight, directly addressing the weight-protection contradiction.
2Object-affected harmful factors
If a non-conductive cable is used to prevent lightning attraction, then the risk of atmospheric discharges is reduced, but the electrical power transmission capability is lost
Solution Approach 1:
The patent segments the cable functions by separating power transmission (via fuel cell on board) from data communication (via fiber optics). This segmentation allows the cable to be non-conductive for lightning protection while power and data needs are met through alternative means carried within the cable structure.
Solution Approach 2:
The aerostat carries its own power generation system (fuel cell) onboard, making it self-sufficient for electrical power needs. This self-service approach eliminates the requirement for conductive power transmission through the cable, allowing the use of non-conductive materials for lightning protection.
3Reliability
If a heavy copper cable is used for lightning protection, then the protection system is more effective, but the aerostat lift capacity is reduced
Solution Approach 1:
The patent changes the material composition parameter of the protection system from heavy conductive copper to lightweight non-conductive polymers. This parameter change maintains protection effectiveness through electrical isolation while dramatically reducing the weight burden on the aerostat, preserving lift capacity.
4Loss of information
If fiber optics are included in the cable for data transmission, then the communication capability is improved, but the cable complexity increases
Solution Approach 1:
The patent makes the cable multi-functional by integrating mechanical support, gas transport, power delivery, data communication, and lightning protection into a single unified structure. The non-conductive cable with integrated fiber optics and fuel cell delivers multiple functions simultaneously, reducing overall system complexity despite the advanced capabilities provided.
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 solution allows for continuous operations of tethered aerial vehicles for months or years, reduces the risk of lightning attraction, and provides a sustainable and lightweight power source, enabling extended telecommunications and monitoring capabilities.
Implementation Method 1
electrical energy self-generating means by fuel cell (10) for powering its on-board electronics
Implementation Method 2
the gas being carried from the ground to the balloon through a pneumatic tube
Implementation Method 3
a synthetic fiber for mechanical support (13), preferably of Vectran polyester fiber, with mechanical strength functionality
Implementation Method 4
a non-conductive tethering cable with a mechanical support fiber and gas tube... that uses hydrogen or helium for lifting and power generation via an on-board fuel cell, reducing the risk of attracting atmospheric discharges
Data Source
AI summary
A tethered aerial system includes an on-board fuel cell for powering on-board electronics and a tether cable which is less conductive than air. The tether cable includes a pipe for carrying a flow of gas to the fuel cell and/or maintain the gas level in a lighter-than-air platform, so that the tethered aerial system can remain operational for an extended period of time. The system is particularly applicable for maintaining communication links in remote areas, agriculture and applications in the IoT (Internet of Things), event coverage, interactive marketing, for post-disaster situations in rural areas and at mining sites or construction sites in remote environments. The system also is immune to rays.