Movable Vane Solar Sail for Orbital Maneuvers
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Solution Overview
Problem
Conventional solar sails are limited to providing propulsion due to their static configuration and large inertial moments, making them unsuitable for navigation in space.
Innovation Solution
A solar sail design featuring a bus with separate movable vanes, each with a reflective surface, allowing for controlled orientation and navigation through solar radiation pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the sail is made with large surface area to maximize photon momentum transfer, then propulsion efficiency is improved, but the inertial moment increases making navigation difficult
Solution Approach 1:
The solar sail is divided into multiple independent quadrants (typically four) that can be controlled separately. Each quadrant has its own actuation system that can adjust the sail's shape and orientation independently, allowing navigation control without requiring the entire large sail to be maneuvered as a single rigid body.
Solution Approach 2:
The sail transitions from a static configuration to a dynamic one with movable quadrants that can change shape and orientation in real-time. This dynamic capability allows the sail to adjust its effective area and center of pressure, enabling navigation control despite the large overall surface area.
2Weight of moving object
If control componentry is reduced to minimize weight, then launch cost is reduced, but navigation capability is lost
Solution Approach 1:
The movable quadrant mechanism serves multiple functions: it provides navigation control by adjusting sail orientation, optimizes propulsion efficiency by adjusting sail shape, and enables both attitude control and trajectory management. This multi-functionality reduces the need for separate dedicated navigation components.
Solution Approach 2:
The sail structure itself provides the navigation capability through its movable quadrants, eliminating the need for separate heavy navigation systems. The sail's own shape and orientation adjustments serve dual purposes of propulsion and navigation.
3Ease of manufacture
If the sail configuration is made static to simplify structure, then manufacturing is easier, but navigation capability is eliminated
Solution Approach 1:
The sail is segmented into multiple quadrants that can be manufactured as separate, identical modules using standardized processes. This segmentation simplifies manufacturing while enabling dynamic reconfiguration for navigation.
Solution Approach 2:
The sail incorporates movable joints and actuators that allow each quadrant to change position and orientation. This dynamic capability is integrated into the manufacturing design, allowing the structure to transition from static to dynamic functionality without overly complicating the manufacturing process.
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
Enables precise navigation and control of the solar sail's trajectory, allowing for orbital maneuvers and interplanetary applications with improved efficiency and reduced mass.
Implementation Method 1
uses solar radiation pressure to propel a sail in space
Implementation Method 2
the photons are specularly reflected, resulting in a transfer of momentum double that of a normally incident incoming photon
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
A solar sail includes a bus and a plurality of separate movable vanes coupled to the bus. Each movable vane includes a reflective surface for generating solar radiation pressure and propel the solar sail in space. Each vane may be movable relative to the bus in a fully deployed configuration such that an amount of thrust generated by solar radiation pressure on each vane is controllable.