Aft Cascade Ring Composite Design for Thrust Reverser Actuation
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Solution Overview
Problem
Current thrust reverser systems for aircraft propulsion face challenges in efficiently supporting and actuating the cascade arrays, particularly in the aft cascade ring, which requires a robust and lightweight design to manage the airflow and thrust reversal effectively.
Innovation Solution
The aft cascade ring is designed with a composite material comprising fibers and thermoplastic, featuring a 'U'-shaped cross-section formed by coupling two 'L'-shaped ring portions with aligned lugs and actuator pathways, providing structural support and actuation for the cascade arrays, and can be formed using compression molding or stamping techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a robust design is used to support cascade arrays, then structural integrity is improved, but weight increases
Solution Approach 1:
The aft cascade ring is constructed using composite materials consisting of fiber reinforcement (such as carbon fiber or glass fiber) embedded in a thermoplastic matrix. This composite structure provides high strength-to-weight ratio, achieving the required structural integrity to support cascade arrays while minimizing weight. The fiber reinforcement carries the primary structural loads, while the thermoplastic matrix binds the fibers together and provides corrosion resistance.
Solution Approach 2:
The aft cascade ring is divided into multiple segments or sections that can be manufactured separately and then assembled together. This segmentation allows for optimized structural design in each section, enabling the use of lighter materials and reduced material thickness while maintaining overall structural integrity. The segmented approach also facilitates easier manufacturing and assembly of the composite structure.
2Weight of moving object
If lightweight materials are used, then weight is reduced, but structural integrity deteriorates
Solution Approach 1:
The aft cascade ring utilizes composite materials with fiber reinforcement (such as carbon fiber or glass fiber) embedded in a thermoplastic matrix. This composite structure provides high strength-to-weight ratio, achieving the required structural integrity to support cascade arrays while minimizing weight. The fiber reinforcement carries the primary structural loads, while the thermoplastic matrix binds the fibers together and provides corrosion resistance.
Solution Approach 2:
Different sections of the aft cascade ring are designed with varying material properties and thicknesses based on local structural requirements. Areas subjected to higher stresses receive enhanced reinforcement, while lower-stress areas use lighter material configurations. This local optimization ensures sufficient structural integrity where needed while minimizing weight overall.
3Ease of operation
If complex actuator pathways are implemented, then actuation efficiency is improved, but device complexity increases
Solution Approach 1:
The actuator pathways are integrated directly into the aft cascade ring structure itself, merging the actuation function with the structural component. This integration eliminates the need for separate actuator mounting brackets, guides, or support structures, thereby improving actuation efficiency while reducing overall device complexity. The composite material allows for built-in actuator channels and pathways to be molded as part of the ring structure.
Solution Approach 2:
The aft cascade ring structure serves multiple functions simultaneously: it provides structural support for cascade arrays, contains integrated actuator pathways for thrust reverser operation, and incorporates airflow redirection features. This multi-functionality reduces the number of separate components needed, simplifying the overall device while maintaining efficient actuation capability.
4Strength
If more material is used, then structural integrity is improved, but material usage increases
Solution Approach 1:
The aft cascade ring is constructed using composite materials consisting of fiber reinforcement (such as carbon fiber or glass fiber) embedded in a thermoplastic matrix. This composite structure provides high strength-to-weight ratio, achieving the required structural integrity to support cascade arrays while minimizing weight. The fiber reinforcement carries the primary structural loads, while the thermoplastic matrix binds the fibers together and provides corrosion resistance.
Solution Approach 2:
Different sections of the aft cascade ring are designed with varying material properties and thicknesses based on local structural requirements. Areas subjected to higher stresses receive enhanced reinforcement, while lower-stress areas use lighter material configurations. This local optimization ensures sufficient structural integrity where needed while minimizing material usage overall.
Data Source
AI summary
An aft cascade ring includes a first ring portion having a first arc shape and defining a first portion first lug. The aft cascade ring further includes a second ring portion having a second arc shape and defining a second portion first lug, the second ring portion being coupled to the first ring portion such that the first portion first lug and the second portion first lug are aligned.