Low Gravity Simulator With Counterweight Force Control 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
1Reliability
If existing reduced-gravity simulators (POGO, ARGOS) are used, then simulation capability is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The patent employs a counterweight system where a mass is suspended by cables to generate an upward force that opposes gravitational force on the test subject. This counterweight mechanism directly reduces the apparent weight of the subject, simulating low-gravity conditions without requiring complex active control systems or expensive infrastructure like POGO or ARGOS.
Solution Approach 2:
The patent creates a simplified复制 (copy) of the gravitational effect experienced in space by using a counterweight system that replicates the weight reduction phenomenon. Instead of recreating the actual microgravity environment of space, it copies the essential characteristic (reduced weight) using a much simpler mechanical system.
2Reliability
If existing reduced-gravity simulators are used, then simulation capability is achieved, but accessibility decreases due to high cost
Solution Approach 1:
The patent replaces expensive, complex simulator infrastructure with a simple, inexpensive counterweight system using basic mechanical components (cables, pulleys, masses). This dramatically reduces the cost barrier, making the system accessible to universities and smaller research organizations that cannot afford million-dollar facilities like POGO or ARGOS.
3Adaptability or versatility
If cable-based suspension systems are used, then three-dimensional movement is enabled, but motion accuracy decreases due to cable elasticity and friction
Solution Approach 1:
The patent incorporates sensors (encoders, force sensors) that continuously monitor the position and force in the cable system. This feedback is fed to a control system that actively compensates for cable elasticity and friction, maintaining high motion accuracy despite the inherent imperfections of flexible cable-based suspension.
Solution Approach 2:
The patent uses active control to dynamically adjust system parameters (cable tension, boom angle) to compensate for non-ideal behavior. By continuously monitoring and adjusting these parameters, the system maintains high precision motion control despite using flexible cables instead of rigid rods.
4Reliability
If parabolic flight is used, then weightlessness is achieved, but duration is limited to seconds
Solution Approach 1:
Instead of relying on brief parabolic flight maneuvers that provide weightlessness for only seconds, the patent uses a stationary counterweight system that can maintain reduced-gravity conditions continuously. The counterweight can be positioned and held in place to provide sustained simulation time limited only by the physical constraints of the facility, not by flight duration.
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; the air bearing is configured to facilitate the motion of the counterweight with respect to the support column
Implementation Method 2
a counterweight attached to the cable at an opposing end to apply a biasing force to the cable
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.