Simulator Motion Filter for Accurate Tilt Coordination
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Solution Overview
Problem
Current simulator control algorithms, such as the classic wash-out filter, struggle to accurately represent medium-frequency translational acceleration components, leading to simulator sickness and inefficiencies in simulating various flight conditions.
Innovation Solution
A method that calculates the apparent plumb line difference between the simulator cabin and the aircraft, using high-pass filtering to compensate for perceptual errors, allowing for precise control of translational and rotational movements within the simulator, ensuring that the simulator's movements align with the aircraft's movements without exceeding perception thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the simulator platform is tilted to represent low-frequency translational acceleration, then the apparent weight vector changes correctly, but the simulator cabin rotation may exceed the perception threshold causing simulator sickness
Solution Approach 1:
The patent applies dynamics by making the filter characteristics adaptive rather than fixed. The washout filter dynamically adjusts its cutoff frequency and transfer function based on the current flight condition and maneuver type. This allows the system to optimize the division between direct acceleration representation and tilt coordination in real-time, ensuring accurate low-frequency acceleration representation while keeping cabin rotations below perception thresholds.
Solution Approach 2:
The patent changes parameters by modifying the filter characteristics (cutoff frequency, transfer function) according to different flight conditions. Instead of using fixed filter parameters, the system adapts these parameters based on the simulated aircraft's state, allowing optimal performance across various maneuvers while preventing simulator sickness.
2Adaptability or versatility
If the classic washout filter is used to convert acceleration signals to target actuator states, then high-frequency and low-frequency components can be represented, but medium-frequency translational acceleration components cannot be accurately represented
Solution Approach 1:
The patent makes the filter characteristics dynamic and adaptive to different flight conditions. By continuously adjusting the filter transfer function based on the current maneuver type and aircraft state, the system can accurately represent medium-frequency acceleration components that would otherwise be poorly handled by fixed filter characteristics.
Solution Approach 2:
The patent implements feedback by continuously monitoring the simulated aircraft's flight state and using this information to adjust the filter characteristics. This closed-loop approach ensures that the filter adapts to maintain accurate acceleration representation across all frequency ranges, particularly improving medium-frequency performance.
3Measurement precision
If the filter is adapted to different flight conditions, then the washout filter can be optimized for specific maneuvers, but it only delivers mediocre results for other flight conditions
Solution Approach 1:
The patent creates a universal filter solution that works across all flight conditions by making the filter characteristics adaptive. Rather than requiring separate optimized filters for different maneuvers, the single adaptive filter automatically adjusts its parameters to provide optimal performance for any given flight condition, achieving both specialization and universality.
Solution Approach 2:
The patent applies dynamics by enabling the filter to automatically adapt its characteristics in real-time based on the current flight condition. This dynamic adaptation allows the filter to maintain optimal performance across diverse maneuvers without requiring manual reconfiguration or multiple specialized filters.
Data Source
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AI summary
The present invention relates to a filter for controlling a simulator for the representation of movements of a simulated vehicle, the rotational and translational control commands required to control the simulator being calculated from a difference between the angle of rotation and the apparent vertical angle, taking into account a physiological rotation rate limitation.