Dissociated Landing Gear Casing for Volume Reduction
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Solution Overview
Problem
Existing aircraft landing gear compartments are bulky and massive due to the need to withstand ground forces and pressurization, with prior art designs using reinforcement frames that extend fuselage elements and result in increased volume and mass.
Innovation Solution
A landing gear compartment design featuring a frame to secure and absorb ground forces, combined with an envelope structure to manage pressurization forces, utilizing a trellis structure with side members and polygons to distribute loads efficiently, eliminating the need for additional hangers and maintaining a reduced volume and mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcement frames extending fuselage elements are used to withstand ground forces and pressurization, then structural strength is improved, but the volume and mass of the landing gear compartment increase
Solution Approach 1:
The invention divides the structural system into two separate components: a frame structure dedicated to withstanding ground forces and an envelope structure dedicated to withstanding pressurization forces. This segmentation allows each component to be optimized for its specific function, preventing the need for an oversized combined structure and thereby reducing the overall volume of the landing gear compartment while maintaining structural strength.
Solution Approach 2:
The frame structure is specifically designed with side members and polygons to efficiently resist ground forces, while the envelope structure is designed to contain and distribute pressurization forces. This local optimization of structural properties for different force types allows the compartment to achieve necessary strength without excessive volume.
2Strength
If reinforcement frames extending fuselage elements are used to withstand ground forces and pressurization, then structural strength is improved, but the mass of the landing gear compartment increases
Solution Approach 1:
By separating the frame structure for ground forces and the envelope structure for pressurization forces, each component can be minimized in mass while performing its specific function. This avoids the need for a massive combined structure, thereby reducing the overall mass of the landing gear compartment while maintaining the required structural strength.
Solution Approach 2:
The frame structure uses side members and polygons optimized for ground force resistance, while the envelope structure is optimized for pressurization containment. This localized optimization allows each component to achieve necessary strength with minimal mass, reducing the total mass of the compartment.
3Volume of stationary object
If a dissociated structure with frame and envelope is used, then the volume and mass are reduced, but the structural complexity increases
Solution Approach 1:
While segmentation into frame and envelope structures requires coordinating two components, it eliminates the need for complex extensions of fuselage frames. The frame structure uses standardized side members and polygons, and the envelope structure is a self-contained pressure-resistant shell, resulting in overall simplified structural complexity despite the dissociated architecture.
Data Source
Figure 1~7
Figure 2A~2B
Figure 3~4
AI summary
The invention relates to a reduced-volume casing for a landing gear comprising a chassis (2, 3, 4, 5) for fixing and taking up loads, to which said landing gear is exposed and an envelop-type structure (6) arranged on the chassis for taking up pressurisation forces. Said chassis can comprise, in particular, a frame (2, 3, 4, 5) which is event to the output opening of the landing gear and is provided with beams (3, 3', 5) used for receiving means for maintaining the fastening bearings (10, 11) of the gear and also comprising polygons (7, 8, 9) which are used for receiving the fastening bearings of the gear manoeuvring strut and are fixed to the beams, wherein said beams and polygons form a lattice structure.