Cabin Air Compressor Bracket Curvature and Stiffener Design
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Solution Overview
Problem
Aircraft environmental control systems face challenges in providing robust, compact, and lightweight components that can withstand harsh environmental conditions such as varying temperatures, pressures, and vibrations while maintaining efficient air conditioning and temperature control.
Innovation Solution
A cross-support bracket for cabin air compressors is designed with specific aperture configurations, a stiffener portion, and a curved region, along with a method of installation that includes coupling the bracket to support structures using fasteners and nut plates, ensuring secure and stable assembly within the aircraft's ECS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the cross-support bracket uses a compact and lightweight design, then the weight and space requirements are improved, but the structural integrity and strength to withstand harsh environmental conditions deteriorate
Solution Approach 1:
The cross-support bracket incorporates curved regions with specific radius ratios (9.06-10.19) instead of straight angles, distributing stress more effectively throughout the structure. This curvature allows the bracket to maintain strength while using less material, directly resolving the contradiction between weight reduction and structural integrity.
Solution Approach 2:
The bracket features a stiffener portion positioned at the curved region where stress concentration occurs. This localized reinforcement provides additional strength precisely where needed without adding unnecessary weight to the entire structure, allowing the bracket to be lightweight overall while maintaining structural integrity at critical points.
2Reliability
If the cross-support bracket is designed to withstand harsh environmental conditions including vibrations and temperature variations, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The curved regions with optimized radius ratios provide inherent stress distribution that improves reliability under vibrations and temperature variations. This geometric feature alone enhances reliability without requiring additional complex components, systems, or assemblies.
Solution Approach 2:
The stiffener portion is strategically placed only at the curved region where stress concentration occurs during vibration and temperature cycling. This localized approach improves reliability at the critical stress point without adding complexity to the entire bracket structure.
3Ease of manufacture
If the cross-support bracket uses a standardized aperture configuration, then the ease of manufacture is improved, but the adaptability to different mounting positions deteriorates
Solution Approach 1:
The aperture configuration serves multiple functions: standardization for ease of manufacture, positioning for the curved region geometry, and adaptability for different mounting locations. The apertures are arranged to work with the curved region's radius ratio while providing flexible mounting options, achieving universality that satisfies all three requirements simultaneously.
Data Source
AI summary
A cross-support bracket for a cabin air compressor assembly includes a mating portion having a first group of apertures at a first end and a second group of apertures at a second end. A reference line is defined between a lowermost primary aperture of the first group of apertures and a lowermost primary aperture of the second group of apertures. A stiffener portion is formed along a lower edge of the mating portion. A curved region is formed in the mating portion between a first and second upper edge of the mating portion. The curved region includes a first curved portion, a substantially straight portion, and a second curved portion. A ratio of a radius of the first and second curved portions of the curved region to a length from the substantially straight portion to the reference line is between 9.06 and 10.19.