Space Tether Intermediate Nodes for Maneuverability
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Solution Overview
Problem
Traditional space tethers are inflexible, unstable, and dependent on external momentum and energy sources, limiting their maneuverability and reliability in space applications.
Innovation Solution
The introduction of intermediate nodes along the tether that can move and propel themselves along the tether, using sensors, processors, and actuators to control their movement and enhance the tether's maneuverability, stability, and durability, allowing for advanced docking maneuvers and orbit changes without distorting the tether material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional tethers are used with fixed end nodes, then the structure is simple, but the maneuverability and adaptability are limited
Solution Approach 1:
The tether is divided into multiple segments by introducing intermediate nodes along its length. These nodes can independently move along the tether, allowing different sections to perform different functions. This segmentation enables complex maneuvers while maintaining a relatively simple overall tether structure.
Solution Approach 2:
The intermediate nodes are designed to be dynamically movable along the tether rather than fixed. This dynamic configuration allows the tether system to adapt its structure in real-time to perform various maneuvers, changing from a static to a dynamic system that can respond to different operational requirements.
2Reliability
If traditional spinning tethers are used, then momentum exchange can occur, but the system is unstable and dependent on external momentum sources
Solution Approach 1:
The intermediate nodes are equipped with their own propulsion systems that can generate momentum independently. This allows the tether system to be self-sufficient, generating its own momentum without relying on external sources or ground-based momentum injection, thereby improving reliability and stability.
Solution Approach 2:
The system can dynamically change parameters such as the position and velocity of intermediate nodes to maintain stability. By adjusting these parameters in real-time, the tether can compensate for disturbances and maintain stable operation without external intervention.
3Adaptability or versatility
If intermediate nodes are added to improve maneuverability, then operational reliability increases, but the device complexity increases
Solution Approach 1:
Each intermediate node is designed as a multi-functional unit that can perform multiple operations: propulsion, momentum exchange, payload transfer, and stabilization. This universality means that while multiple nodes are added, each node consolidates several functions that would otherwise require separate systems, thereby limiting the increase in overall complexity.
4Adaptability or versatility
If traveling nodes are used instead of fixed nodes, then the tether can perform advanced maneuvers, but the control system complexity increases
Solution Approach 1:
The control system incorporates feedback mechanisms where sensors on the traveling nodes continuously monitor position, velocity, and tether tension. This real-time feedback allows the control system to make adjustments based on actual system state, enabling precise docking maneuvers while managing complexity through intelligent control rather than purely mechanical complexity.
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
This solution increases the tether's operational reliability and durability, enabling more versatile space maneuvers, such as changing orbits and reducing perturbations, while maintaining the energy and momentum transfer efficiency of traditional tethers without propellant loss.
Implementation Method 1
a means for propelling the intermediate node along the tether
Implementation Method 2
Spinning tethers that change the velocity and orbit of payloads have been called 'momentum exchange tethers' or 'bolos' in the literature. Spinning tethers create tension within the tether through the centripetal force of the spin.
Data Source
AI summary
Methods and systems related to space systems and more specifically to tethers for space maneuverability and replated applications are disclosed herein. Specific embodiments disclosed herein improve traditional space tethers by increasing the functionality of the tether, improving the stability of the tether, and enhancing the operational reliability and durability of the tethers. A disclosed method to execute a maneuver for a tether system comprises: obtaining sensor data using a sensor; calculating, using the sensor data, a required command for an actuator to execute the maneuver; and executing the required command to execute the maneuver to traverse an intermediate node along a tether using the actuator. The center of mass of the tether system is thereby altered and the maneuver is executed.