Pallet Skew Correction with Paired Drive Units and Infrared Feedback
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Solution Overview
Problem
Conventional aircraft cargo systems face challenges in correcting pallet skew during loading, leading to potential load shifts and impacts due to uneven translation of heavy pallets within the cargo compartment.
Innovation Solution
A cargo handling system with paired power drive units (PDUs) and infrared sensors, controlled by a controller, dynamically engages and disengages drive and brake rollers to correct pallet skew by adjusting the propulsion and braking of PDUs based on sensor feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional cargo systems use motor driven rollers to transport pallets, then cargo can be moved within the aircraft cargo compartment, but pallet skew occurs during loading leading to load shifts and impacts
Solution Approach 1:
The system uses infrared sensors to detect the position of pallet edges and provides feedback to the controller. The controller continuously monitors sensor signals and adjusts the operation of paired power drive units based on this feedback, enabling real-time correction of pallet skew and maintaining proper alignment during transport.
Solution Approach 2:
The system dynamically adjusts the operation of individual power drive units during the loading process. Based on infrared sensor detection, the controller can engage or disengage specific drive rollers on either side of the pallet, creating asymmetric propulsion forces that actively correct skew and maintain dynamic alignment stability throughout cargo movement.
2Reliability
If paired power drive units are used with infrared sensors and dynamic engagement control, then pallet skew is corrected and alignment is maintained, but the system complexity increases
Solution Approach 1:
The cargo handling system is divided into multiple independent paired power drive units distributed along the loading path. Each pair consists of left and right drive rollers that can be independently controlled. This segmentation allows localized correction of skew at different positions without requiring complex centralized mechanical linkages.
Solution Approach 2:
The system replaces complex mechanical alignment mechanisms with an electronic control system using infrared sensors and a controller. Instead of mechanical linkages or physical guides, the invention uses optical detection and electronic signal processing to sense pallet position and control drive unit engagement, simplifying the overall system architecture while improving precision.
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
Effectively reduces pallet skew and minimizes load shifts and impacts by aligning pallets with the cargo compartment, enhancing safety and stability during loading and unloading processes.
Implementation Method 1
Each power drive unit in the set of first power drive units is paired with a power drive in the set of second power drive units. The cargo handling system further includes a controller. The controller is configured to send a command to engage the drive roller of each of the set of first power drive units to drive a cargo in a first direction and, responsive to receiving a first signal from the infrared sensor from a first power drive unit in the set of second power drive units
Data Source
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AI summary
A cargo handling system is provided. The cargo handling system includes a set of first power drive units (210a-210e), a set of second power drive units (212a-212e), and a controller. Each of the set of first power drive units (210a-210e) and the set of second power drive units (212a-212e) includes a drive roller, a motor configured to rotate the drive roller; and an infrared sensor. The controller is configured to send a command to engage the drive roller of each of the set of first power drive units (210a-210e) to drive a cargo in a first direction and, responsive to receiving a first signal from the infrared sensor from a first power drive unit in the set of second power drive units (212a-212e), send a command to disengage a drive roller of a paired first power drive unit in the set of first power drive units (210a-210e).