Dynamic Tactile Feedback for Aircraft Turbulence Masking
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Solution Overview
Problem
Aircraft turbulence masks tactile feedback signals from stick shaker devices, leading to delayed pilot response during imminent flight issues.
Innovation Solution
A system that uses an accelerometer to process turbulence data and dynamically adjust tactile feedback characteristics, ensuring the feedback signal has a high signal-to-noise ratio by differing from turbulence-induced vibrations, and can be adjusted based on pilot physiology and received via a control yoke, seat, or networked across multiple aircraft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed frequency tactile feedback signal is provided through the stick shaker, then the warning system is simple and reliable, but the signal can be masked by turbulence-induced vibrations causing delayed pilot response
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed-frequency stick shaker to a variable-frequency tactile feedback system. The turbulence processing unit continuously monitors accelerometer data and dynamically adjusts the feedback frequency in real-time to avoid masking by turbulence. This dynamic adaptation ensures the warning signal remains effective under varying flight conditions.
Solution Approach 2:
The system changes the frequency parameter of the tactile feedback signal based on detected turbulence characteristics. When turbulence is detected, the system modifies the feedback frequency to differ from the turbulence frequency, ensuring the pilot can distinguish the warning signal from natural vibrations. This parameter adjustment resolves the masking problem while maintaining signal effectiveness.
2Reliability
If the tactile feedback frequency is adjusted to differ from turbulence frequency, then the signal-to-noise ratio improves, but the system complexity increases due to additional processing requirements
Solution Approach 1:
The system achieves multi-functionality by having the turbulence processing unit serve multiple purposes: it monitors flight conditions, analyzes accelerometer data, determines turbulence characteristics, and controls the tactile feedback generator. This consolidates multiple functions into a single integrated unit, improving signal-to-noise ratio while limiting the increase in overall system complexity.
Solution Approach 2:
The system employs self-service through automatic turbulence detection and adaptive feedback adjustment. The accelerometer continuously monitors vibrations, and the processing unit automatically determines when turbulence masking occurs and adjusts the feedback frequency accordingly, without requiring manual pilot intervention or complex external systems.
3Adaptability or versatility
If real-time turbulence monitoring is implemented, then the tactile feedback can be optimized for current conditions, but the response time and system resource usage increase
Solution Approach 1:
The system applies preliminary action by continuously monitoring turbulence conditions in advance of when a warning may be needed. The accelerometer and processing unit are always active, analyzing flight conditions so that when a stall warning becomes necessary, the system can immediately provide optimized tactile feedback without delay for turbulence assessment.
Solution Approach 2:
The system uses feedback by continuously monitoring accelerometer data and using this information to adjust the tactile feedback characteristics. This closed-loop approach ensures the warning signal adapts to current turbulence conditions while maintaining minimal delay through efficient real-time processing of the feedback signal.
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
Enhances pilot situational awareness and response time by providing distinct tactile feedback that overrides cockpit vibrations, even in turbulent conditions, and allows predictive turbulence evaluation across multiple aircraft.
Implementation Method 1
An accelerometer is positioned within the vehicle. A turbulence processing unit is coupled to receive accelerometer data from the accelerometer.
Implementation Method 2
A tactile feedback generator is coupled to provide a controllable tactile feedback signal to an operator of a vehicle upon receipt of an activation signal.
Data Source
AI summary
A system and method is disclosed for providing dynamic tactile feedback. A tactile feedback generator is mounted in each vehicle in a group of vehicles and is coupled to provide a controllable tactile feedback signal to an operator of each vehicle in the group of vehicles upon receipt of an activation signal. A tactile feedback control device is mounted in each vehicle in the group of vehicles and is coupled to the tactile feedback generator for selectively providing an activation signal and a tactile feedback characteristic signal thereto. An accelerometer is positioned within each vehicle in the group of vehicles. A turbulence processing unit is coupled to receive accelerometer data from each accelerometer. The turbulence processing unit processes the accelerometer data to identify characteristics of a current level of turbulence-induced vibration, and, based thereon, selects and provides updated tactile feedback characteristics to each tactile feedback control device.