Electromechanical Braking Roller Speed Control
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Solution Overview
Problem
Aircraft cargo systems lack an efficient and automated mechanism to control the speed of unit load devices (ULDs) during loading and unloading, relying on manual intervention or passive braking rollers that are not adaptive to varying ULD speeds.
Innovation Solution
An automatic electromechanical braking roller system comprising a power drive unit with a sensor to detect ULD speed and a controller that sends a braking signal to an electromechanical braking roller (EBR) to either allow free rotation or apply braking, depending on the ULD's speed relative to a threshold, ensuring controlled speed management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual intervention or passive braking rollers are used to control ULD speed, then the system structure remains simple, but the system lacks adaptability to varying ULD speeds and cannot provide efficient automated speed control
Solution Approach 1:
The patent replaces passive mechanical braking rollers with an electromechanical braking roller that incorporates a Hall-effect sensor and electromagnetic actuator. This substitution enables automated speed detection and adaptive braking control, allowing the system to respond dynamically to varying ULD speeds while maintaining a relatively compact structure suitable for aircraft cargo hold floors.
Solution Approach 2:
The system enables self-service operation by automatically detecting ULD speed through the Hall-effect sensor and triggering the electromagnetic actuator to apply braking force when speed exceeds the threshold. This eliminates the need for manual intervention while providing adaptive speed control, resolving the contradiction between automation and structural simplicity.
2Productivity
If automated speed control is implemented using sensors and controllers, then efficient and adaptive speed control is achieved, but the device complexity increases
Solution Approach 1:
The patent replaces complex manual control systems with a streamlined electromechanical system comprising a Hall-effect sensor, controller, and electromagnetic actuator integrated into the braking roller. This substitution achieves efficient automated speed control with minimal components, improving productivity while controlling device complexity.
Solution Approach 2:
The electromechanical braking roller serves multiple functions: it acts as a support roller during normal operation and automatically activates as a brake when ULD speed exceeds the threshold. This multi-functionality reduces the need for separate components, achieving efficient speed control without proportionally increasing device complexity.
3Shape
If electromagnetic actuators and brake stacks are integrated into the braking roller, then compact and robust design is achieved, but the manufacturing complexity increases
Solution Approach 1:
The patent employs a nested structure where the electromagnetic actuator and brake stack are integrated within the braking roller assembly. The actuator is positioned to directly engage the brake stack, creating a compact unit that fits within the constraints of aircraft cargo hold floors while minimizing the number of separate manufacturing steps.
Solution Approach 2:
The patent merges the electromagnetic actuator, brake stack, and roller support structure into a single integrated electromechanical braking roller unit. This consolidation achieves compactness suitable for aircraft applications while simplifying manufacturing by reducing the number of separate components that require assembly.
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
The system provides adaptive and efficient speed control of ULDs, enhancing safety and operational efficiency by automatically adjusting braking based on ULD speed, reducing the risk of accidents and improving cargo handling processes.
Implementation Method 1
the sensor comprises a Hall-effect sensor. the sensor detects the ULD speed via the disk. the sensor is configured to detect the rotational velocity of the disk via the magnet
Implementation Method 2
an electromagnetic actuator disposed around the inner shaft. In response to receiving the braking signal from the controller, the EBR is energized
Implementation Method 3
a brake stack disposed around the inner shaft. the brake stack comprises a first brake disk, a second brake disk, and a skew roller disposed the first brake disk and the second brake disk
Data Source
AI summary
An automatic electromechanical braking roller system includes a power drive unit (PDU) comprising a sensor configured to detect a speed of a unit load device (ULD), a controller configured to receive a speed signal corresponding to a speed of the ULD from the sensor, and an electromechanical braking roller (EBR) spaced apart from the PDU and configured to receive a braking signal from the controller in response to the speed of the ULD being greater than a threshold value. In response to the speed of the ULD being less than the threshold value, the EBR is configured to rotate freely about an axis in a first state. In response to the speed of the ULD being greater than the threshold value, the EBR is configured to reduce the speed of the ULD in a second state.