Simulator Cabin Pitch Control for Vertical Axis Acceleration
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Solution Overview
Problem
Current simulator technologies cannot accurately simulate low-frequency translational accelerations in the vertical axis of a vehicle, leading to simulation errors and potential simulator sickness, as they rely on tilting mechanisms that are perceptible and limited to longitudinal and lateral axes, unable to represent load factors effectively during maneuvers like curvilinear flight or flare-out.
Innovation Solution
The method involves calculating a pitch-attitude angle for the simulator cabin based on vertical axis forces, allowing the cabin to be rotated about the transverse axis to simulate low-frequency load factors, while high-frequency components are handled through translational motion, using a combination of low-pass and high-pass filters to generate appropriate control commands and maintain perception within physiological limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the simulator cabin is tilted to represent low-frequency translational acceleration in the longitudinal and transverse axes, then the apparent-weight vector changes to simulate acceleration forces, but the rotation of the simulator cabin becomes perceptible to the driver, causing simulator sickness
Solution Approach 1:
The patent segments the acceleration signal into high-frequency and low-frequency components using filter arrangements. High-frequency components are reproduced by translational motion of the simulator cabin, while low-frequency components are reproduced by adjusting the pitch attitude angle, allowing each frequency range to be handled by the most appropriate motion type without causing perceptible rotations
Solution Approach 2:
The patent dynamically adjusts the pitch attitude angle of the simulator cabin based on the low-frequency acceleration components. By continuously modifying the pitch attitude within physiological perception thresholds, the system maintains accurate simulation of vertical axis accelerations without causing perceptible cabin rotations that would lead to simulator sickness
2Measurement precision
If the simulator uses translational motion to reproduce vertical axis accelerations, then load factors can be simulated, but the motion platform requires excessive travel distance and becomes impractical for prolonged accelerations
Solution Approach 1:
The patent dynamically adjusts the pitch attitude angle of the simulator cabin based on the low-frequency acceleration components. By continuously modifying the pitch attitude within physiological perception thresholds, the system maintains accurate simulation of vertical axis accelerations without causing perceptible cabin rotations that would lead to simulator sickness
Solution Approach 2:
The patent transitions from using purely translational motion in the vertical axis to using rotational motion (pitch attitude adjustment) to simulate vertical axis accelerations. This dimensional change allows the simulator to reproduce load factors by tilting the cabin within physiological thresholds, eliminating the need for excessive vertical travel distance while maintaining simulation accuracy
3Object-affected harmful factors
If the simulator cabin rotation is kept below the perception threshold to avoid simulator sickness, then the driver does not perceive the rotation, but the simulation accuracy for vertical axis accelerations is reduced
Solution Approach 1:
The patent segments the acceleration signal into high-frequency and low-frequency components using filter arrangements. High-frequency components are reproduced by translational motion of the simulator cabin, while low-frequency components are reproduced by adjusting the pitch attitude angle, allowing each frequency range to be handled by the most appropriate motion type without causing perceptible rotations
Solution Approach 2:
The patent changes the parameter used to simulate vertical axis accelerations from translational displacement to pitch attitude angle. By adjusting the pitch attitude within physiological perception thresholds (typically less than 0.5 degrees), the system maintains simulation accuracy while keeping rotations imperceptible to the driver, thus avoiding simulator sickness
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
This approach enables the simulation of low-frequency load factors in the vertical axis without causing simulator sickness, by subtly adjusting the cabin's pitch attitude and limiting rotations to avoid perception, thereby enhancing the realism of vehicle maneuvers like curvilinear flight.
Implementation Method 1
a low-pass filter for extracting, from the acceleration signal, the low-frequency acceleration components
Implementation Method 2
a high-pass filter for extracting, from the acceleration signal, the high-frequency acceleration components
Implementation Method 3
the low-frequency components of the translational acceleration in the longitudinal axis and in the transverse axis, on the other hand, are represented by the tilting of the simulator cabin in relation to the perpendicular to the Earth (angle between the normal axis and the perpendicular to the Earth), as a result of which the apparent-weight vector in the cabin changes
Data Source
AI summary
The invention relates to a process for controlling a simulator, wherein acceleration forces along the vertical axis of the vehicle are to be simulated by tilting the simulator booth.