Control Moment Gyroscope for Stable Legged Robot Balance
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Solution Overview
Problem
Existing gyroscopically stabilized legged robots are complex and costly, requiring sophisticated motion sensing and control systems to maintain balance, which is not suitable for lower-end tasks or environments where simplicity and cost-effectiveness are necessary.
Innovation Solution
A simplified gyroscopically stabilized legged robot design that incorporates a control moment gyroscope with a tilting mechanism to generate gyroscopic reaction torques, allowing for improved orientation control independently of leg locomotion movements, and utilizing a gyroscope controller to manage these torques based on detected angular orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reaction wheel-based control is used to transfer angular momentum to correct balance, then balance control is achieved, but the achievable speed is limited and saturation occurs at maximum speed
Solution Approach 1:
The patent changes the fundamental parameter of angular momentum storage from reaction wheels to a gyroscopic rotor, enabling continuous operation without saturation. The gyroscopic rotor maintains constant spin speed while providing balance control through precession, avoiding the speed limitations and saturation issues of reaction wheels.
2Power
If increasing the mass of the flywheel is done to allow greater momentum transfer, then momentum transfer capability is improved, but added weight must be carried
Solution Approach 1:
The patent changes from increasing mass to utilizing gyroscopic precession mechanics. The control moment gyroscope generates torque through precession of a spinning rotor, where the torque magnitude depends on the rotor's spin speed and precession rate, not on increasing the rotor's mass. This provides unlimited momentum transfer capability without adding weight.
3Reliability
If gyroscope precession is used to achieve balancing in coronal and sagittal planes, then stabilization is achieved, but the gait and precession must be tightly synchronized with restrictive constraints
Solution Approach 1:
The patent extracts the balance control function from the legged locomotion system by introducing an independent control moment gyroscope. The CMG provides stabilization independently of the gait cycle, eliminating the need for tight synchronization between gait and precession. The gyroscope controller operates separately from the leg motion controller, simplifying the overall system control architecture.
4Speed
If sophisticated motion sensing and control combined with capable actuators are used, then fast application of balance forces is achieved, but cost and complexity increase significantly
Solution Approach 1:
The patent replaces complex mechanical balance control systems with a gyroscopic stabilization system. Instead of using sophisticated actuators and control algorithms to modulate ground contact forces, the system uses a control moment gyroscope that provides passive-like stabilization through gyroscopic effects, dramatically reducing complexity while maintaining fast response.
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 enables stable and efficient legged locomotion with improved orientation control, reducing the need for complex and costly actuation systems, while maintaining the ability to navigate challenging terrain.
Implementation Method 1
a tilting mechanism for supporting the rotor relative to the robot, the tilting mechanism being configured to rotate the rotor spin axis about two gyroscope rotation axes to thereby generate respective gyroscopic reaction torques
Implementation Method 2
the tilting mechanism being configured to rotate the rotor spin axis about two gyroscope rotation axes
Implementation Method 3
an orientation sensor for detecting an angular orientation of the body
Data Source
AI summary
A gyroscopically stabilised legged robot including: a body; a number of legs coupled to the body and configured for providing legged locomotion of the robot across a surface in use; an orientation sensor for detecting an angular orientation of the body; a control moment gyroscope mounted on the robot, the control moment gyroscope including a rotor that spins around a rotor spin axis in use, and a tilting mechanism for supporting the rotor relative to the robot, the tilting mechanism being configured to rotate the rotor spin axis about two gyroscope rotation axes to thereby generate respective gyroscopic reaction torques; and a gyroscope controller configured to control operation of the tilting mechanism based at least in part on the detected angular orientation of the body, such that gyroscopic reaction torques are generated to at least partially stabilise the angular orientation of the body during the legged locomotion of the robot.