Collapsible Drag Link for Thrust Reverser Blocker Doors
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Solution Overview
Problem
The existing thrust reverser systems face challenges in connecting drag links to translating sleeves and stationary bodies, which respond differently to structural flight loads, and the drag links create aerodynamic drag, decrementing aircraft performance.
Innovation Solution
A thrust reverser system with a drag link comprising multiple segments, where each segment is coupled via torsional springs, allowing for efficient deployment and stowage of blocker doors, and the drag link is connected to an outer fixed structure and the blocker door, minimizing aerodynamic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a drag link is used to connect the translating sleeve and blocker door, then the blocker door can be pulled inward to redirect airflow for reverse thrust, but the drag link creates aerodynamic drag and structural load challenges
Solution Approach 1:
The drag link is divided into multiple collapsible segments that can compress along the airflow direction during deployment, reducing the protruding width and aerodynamic drag while maintaining the functional connection between the translating sleeve and blocker door
Solution Approach 2:
The drag link transitions from a rigid structure to a dynamically collapsible structure that changes its configuration based on operational state, compressing during deployment to minimize drag and expanding during retraction to maintain connection functionality
2Strength
If a rigid drag link is used to connect the translating sleeve and blocker door, then the connection is structurally strong, but it cannot accommodate different responses to structural flight loads
Solution Approach 1:
The drag link is segmented into multiple sections connected by joints that allow relative movement, enabling each segment to independently respond to structural loads while maintaining overall connection integrity
Solution Approach 2:
The drag link's structural parameters (width, height, orientation) change dynamically during compression and extension, allowing it to adapt its mechanical properties in response to varying flight loads while maintaining connection strength
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
The system effectively deploys and stows the blocker doors with reduced aerodynamic drag, improving aircraft performance by managing structural loads and airflow efficiently.
Implementation Method 1
the first segment and the second segment may be coupled via first torsional spring. the second segment and the third segment may be coupled via a second torsional spring
Data Source
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AI summary
A thrust reverser system of a nacelle is provided. The thrust reverser system may include a pressure shell (243), a blocker door (220), and a drag link (400). The blocker door (220) may be pivotably coupled to the pressure shell (243). The drag link (400) may include a first segment (410) pivotably coupled to a second segment (430) and a third segment (450) pivotably coupled to the second segment (430) and the blocker door (220).