Reconfigurable Cargo Restraint Assembly for Variable ULD Sizes
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Solution Overview
Problem
Existing aircraft cargo handling systems lack flexibility in accommodating cargo of different sizes, particularly in the lateral direction, requiring additional fixed hardware and increasing weight and complexity.
Innovation Solution
A cargo restraint assembly comprising a center portion with extendable longitudinal and lateral restraints, shear pins, and a locking mechanism, allowing removably coupling to a cargo deck to restrain ULDs in multiple configurations, including a grid pattern for varying sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed side guides and retractable guides are used to provide restraint, then cargo restraint function is achieved, but system weight and complexity increase
Solution Approach 1:
The restraint system is divided into modular restraint assemblies, each comprising a center portion with multiple restraints extending in different directions. Each assembly can be independently configured and installed, allowing the system to be segmented into functional units that can be selectively deployed based on cargo requirements.
Solution Approach 2:
The restraint assemblies are designed with multi-directional restraints (first longitudinal, first lateral, second longitudinal, second lateral) that can accommodate various cargo configurations. The same assembly type can restrain cargo in different orientations and positions, eliminating the need for multiple specialized restraint systems.
2Adaptability or versatility
If additional fixed hardware is added to accommodate cargo of different width, then adaptability to different cargo sizes is improved, but system weight and complexity increase
Solution Approach 1:
The restraint assemblies are designed to be movable and reconfigurable rather than fixed. The assemblies can be repositioned along the cargo hold and reconfigured to accommodate different cargo dimensions, allowing the system to adapt dynamically to varying cargo requirements without adding permanent hardware.
Solution Approach 2:
The system accommodates different cargo sizes by changing the position and configuration parameters of the restraint assemblies rather than by physical modification. The assemblies can be adjusted to different locations and orientations to match various cargo dimensions, achieving adaptability through parameter variation.
3Reliability
If retractable restraints are used to handle X and Z directions, then longitudinal and vertical restraint is achieved, but system complexity increases
Solution Approach 1:
Multiple restraint functions are merged into a single integrated assembly. The center portion combines first longitudinal restraint, first lateral restraint, second longitudinal restraint, and second lateral restraint into one unified structure, eliminating the need for separate retractable mechanisms for each direction.
Solution Approach 2:
The restraint assembly provides multi-directional restraint capabilities (X, Y, and Z directions) through its integrated structure. The same assembly simultaneously handles longitudinal, lateral, and vertical restraint functions, reducing the need for multiple specialized mechanisms.
Data Source
AI summary
A cargo restraint system comprises a plurality of cargo restraint assemblies. Each cargo restraint assembly in the plurality of cargo restraint assemblies may be removably coupled to a cargo deck in various configurations. The plurality of cargo restraint assemblies may be reconfigurable based on a size of a plurality of unit load devices (ULDs) to be loaded and restrained. Each cargo restraint assembly may restrain four or fewer corners of respective ULDs simultaneously.