Low-Gravity Simulator With Counterweight Boom for 3D Motion
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Solution Overview
Problem
Existing methods for simulating low gravity environments are limited in duration, dimensionality, and accessibility, particularly for space exploration, and are costly, making them inaccessible to new space agencies and research universities.
Innovation Solution
A low gravity simulator comprising a vertically extending support column with a rotatable boom, a carriage, a cable, a counterweight, and a force control system, allowing for three-dimensional movement and precise control of simulated gravity through a force feedback sensor and boom positioning units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing low gravity simulation methods (wire suspension, POGO, water tanks) are used, then some aspect of low gravity simulation is achieved, but the simulation is limited in dimensionality (2D or restricted motion) and duration
Solution Approach 1:
The simulator is divided into independent functional modules: a support structure with multiple cables, individual motors for each cable, and separate control systems. This segmentation allows each cable to be controlled independently to provide forces in multiple directions, enabling three-dimensional motion while maintaining system flexibility and ease of operation for extended periods
Solution Approach 2:
The cable suspension system serves multiple functions simultaneously: it provides structural support, generates simulated gravity forces, enables three-dimensional motion control, and allows for variable gravity levels. The same system can simulate different celestial body gravities by adjusting cable tensions, making it universally applicable for testing various space exploration scenarios
2Reliability
If sophisticated reduced-gravity simulators like POGO are used, then dynamic motion simulation is improved, but high inertial loads are exerted on the test subject and the supporting frame obstructs the working area
Solution Approach 1:
The system uses counterweights attached to the cables to balance the weight of the test subject and equipment. By positioning counterweights along the cable paths, the system offsets gravitational forces, reducing inertial loads on the supporting frame and minimizing obstruction of the working area while maintaining accurate motion simulation
Solution Approach 2:
The simulator transitions from two-dimensional wire suspension to a three-dimensional cable system with multiple degrees of freedom. By adding vertical cable components and enabling motion in all three spatial dimensions, the system accurately simulates planetary gravity environments while expanding the usable working area above the support structure
3Measurement precision
If cable-based suspension systems like ARGOS are used, then active tracking of motion is achieved, but the system is limited to a small rectangular area and the supporting frame obstructs the working area
Solution Approach 1:
The system employs dynamic cable length adjustment and active motor control to adapt to the test subject's motion in real-time. Sensors continuously monitor position and orientation, and the control system dynamically adjusts cable tensions and lengths to maintain accurate tracking throughout a larger three-dimensional workspace, eliminating the fixed rectangular limitation of previous systems
Solution Approach 2:
The cable system acts as an intermediary between the support structure and the test subject, transmitting forces while allowing flexible motion. This intermediary approach enables precise force application and motion tracking without requiring rigid supporting frames that would obstruct the working area, as cables can be routed through the space above the test area
4Reliability
If existing low gravity simulation facilities are accessed, then testing can be performed, but the cost is extremely high making it inaccessible to new space agencies and research universities
Solution Approach 1:
The system uses commercially available components such as standard motors, cables, sensors, and control electronics that can be readily manufactured and replaced at low cost. This approach eliminates the need for expensive specialized equipment, making the simulator accessible to new space agencies and research universities with limited budgets while maintaining reliable testing capability
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 accurate, three-dimensional simulation of low gravity environments, providing cost-effective and accessible testing for space rovers, accommodating dynamic movements and external disturbances, and maintaining a consistent simulated gravity field.
Implementation Method 1
the support column comprises an air bearing; a boom, wherein the boom is mounted to the support column
Data Source
AI summary
A low gravity simulator configured to place an object under a simulated low gravity force is disclosed. The low gravity simulator comprises: a substantially vertically extending support column, wherein the support column comprises an air bearing; a boom, wherein the boom is mounted to the support column, and wherein the boom is rotatable about a vertical axis; a carriage, the carriage translatably mounted on the boom so that the carriage is, in use, movable backwards and forwards along the boom; a cable supported by the carriage and connectable at one end, in use, to the object; and a counterweight attached to the cable at an opposing end to apply a biasing force to the cable. The counterweight is restrained by the support column and the air bearing is configured to facilitate the motion of the counterweight with respect to the support column.