Spherical Vehicle Simulator for Unbounded Rotational Dynamics
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Solution Overview
Problem
Current motion simulators, such as those using hexapod platforms, are limited in simulating large rotational motions like uncommanded roll, pitch, and yaw, which are nonlinear phenomena, leading to inadequate training and understanding of vehicle dynamics, resulting in accidents and crashes.
Innovation Solution
A motorized spherical vehicle suspended inside a spherical shell with air bearing supports, providing infinite rotational freedom and active control of roll, pitch, and yaw movements, allowing for fully nonlinear rotational dynamic simulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hexapod platform is used for motion simulation, then six-degree-of-freedom motion is provided, but roll, pitch, and yaw are limited in small ranges
Solution Approach 1:
The patent employs a spherical vehicle suspended within a spherical shell, allowing rotational motion about any axis passing through the center. This spherical geometry inherently provides unlimited rotational freedom (infinite degrees of rotational freedom) compared to the limited range of hexapod platforms, while maintaining a relatively simple suspension structure using air bearing supports.
2Measurement precision
If linearization approximation is used for flight dynamics, then computational simplicity is achieved, but accuracy deteriorates for large rotational motions
Solution Approach 1:
The patent replaces the traditional linearized mathematical model with a nonlinear dynamics model that accurately captures large rotational motions. The spherical vehicle platform, combined with nonlinear flight dynamics equations, enables accurate simulation of uncommanded roll, pitch, and yaw without relying on small-angle approximations, thereby improving simulation fidelity for extreme maneuvers.
3Reliability
If passive motion simulation is used, then device simplicity is maintained, but training effectiveness for uncommanded motions is insufficient
Solution Approach 1:
The patent implements an active control system that uses feedback from motion sensors and flight dynamics models to generate realistic uncommanded roll, pitch, and yaw motions. The control system processes pilot inputs and environmental conditions to produce authentic nonlinear rotational responses, significantly enhancing training effectiveness for handling extreme maneuvers while maintaining manageable system 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
Enables realistic simulation of nonlinear vehicle dynamics, improving training for pilots and designers, and providing a test bed for calibrating simulators and analyzing new vehicle designs, effectively addressing the limitations of existing simulators.
Implementation Method 1
A motorized spherical vehicle suspended inside a spherical shell by a plurality of air bearing supports
Data Source
AI summary
A vehicle nonlinear dynamics experimental simulation device, such as flight simulator, including a motorized spherical vehicle suspended inside a spherical shell which has a smooth inner surface. The spherical vehicle is supported by a plurality of spiky legs with bearing assemblies. The spherical shell is supported by three controllable translational motion platforms. Simulating apparatuses for a pilot cabin is mounted inside the spherical vehicle. The spherical vehicle has driving, restoring, and damping capabilities in roll, pitch, and yaw directions and is capable of unbounded rotation in any directions. The spherical vehicle provides an experimental model to simulate a vehicle's rotational dynamics.