Aircraft Galley Trolley Motion Detection via Ultrasonic Doppler Shift
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Solution Overview
Problem
Conventional locks for aircraft galley carts and cabinets do not provide real-time monitoring of trolley movement during flight, posing a hazard due to turbulence and failing to meet FAA regulations for secure locking.
Innovation Solution
A system comprising a motion sensor with an ultrasonic transmitter and receiver, connected to a controller that alerts users via an output device when unsecured trolley movement is detected, using Doppler shift analysis to monitor trolley motion within the galley bay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional locks are used for galley carts and cabinets, then the locking function is provided, but real-time monitoring of trolley movement is not available
Solution Approach 1:
The patent replaces conventional mechanical locks with an ultrasonic monitoring system that uses acoustic waves to detect trolley movement. The ultrasonic transmitter and receiver detect Doppler shifts in the reflected waves to determine whether a trolley is securely locked, providing real-time information without complex mechanical sensors.
Solution Approach 2:
The patent introduces ultrasonic waves as an intermediary to detect trolley movement. The waves serve as a mediator between the monitoring system and the trolley, allowing indirect detection of movement through Doppler shift analysis without requiring direct physical contact or complex mechanical linkages.
2Reliability
If no motion monitoring is implemented, then device complexity is low, but safety hazards exist during flight turbulence
Solution Approach 1:
The patent implements a feedback system where the ultrasonic receiver continuously monitors the reflected waves from the trolley, detects Doppler shifts indicating movement, and provides real-time feedback to alert crew members. This feedback mechanism enhances reliability by immediately detecting unsecured trolleys during flight turbulence.
Solution Approach 2:
The monitoring system is self-monitoring in that it automatically detects trolley movement through ultrasonic wave analysis without requiring manual inspection. The system serves itself by using the environment (air in the galley) as the medium for wave propagation and detection.
3Productivity
If manual inspection of trolleys is performed, then equipment cost is low, but real-time detection of unsecured trolleys is not achieved
Solution Approach 1:
The patent enables continuous monitoring of trolley securement status through constant ultrasonic wave transmission and reception. Unlike manual inspection which is intermittent, the ultrasonic system provides uninterrupted real-time detection of trolley movement, significantly improving monitoring efficiency and safety.
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 the securement of galley trolleys by providing real-time monitoring and alerting crew members of unsecured trolleys, ensuring compliance with FAA regulations and minimizing damage during turbulence.
Implementation Method 1
The motion sensor can include an ultrasonic transmitter and an ultrasonic receiver, where the transmitter can be configured to interrogate a surface with ultrasonic waves and the receiver can be configured to receive a return of ultrasonic waves
Implementation Method 2
The controller can be connected to the receiver and configured to receive a signal from the ultrasonic receiver and to monitor the return of ultrasonic waves for a Doppler shift indicative of unsecured trolley movement
Data Source
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AI summary
A system for securement of galley trolleys in aircraft comprises a motion sensor (104) mounted to monitor a trolley in a trolley bay; a controller (110) connected to the motion sensor (104), and an output device (112) operatively connected to the controller (110). The controller (110) is configured to receive a signal from the motion sensor (104) to detect unsecured motion of a trolley in the trolley bay and the output device (112) is configured to alert a user upon detection of unsecured motion of a trolley in the trolley bay. A method for securement of galley trolleys in aircraft includes monitoring a trolley in a trolley bay of an aircraft for motion and alerting a user upon unsecure motion of the trolley.