Telescoping Payload Extension Mechanism for Aircraft Drag Reduction
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Solution Overview
Problem
Aircraft systems face challenges in efficiently extending and retracting internally stored payloads without affecting aerodynamic performance and ensuring consistent load reaction and orientation.
Innovation Solution
A telescoping mechanism with forward and aft tracks attached to the aircraft's payload bay walls, a first stage for initial translation, and a second stage for further extension, along with a payload actuator system to move the rack between retracted and extended positions, maintaining payload orientation and load consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a telescoping mechanism with multiple stages is used for payload extension, then the payload can be extended further while minimizing drag, but the device complexity increases
Solution Approach 1:
The payload extension system is divided into multiple telescoping stages (first stage, second stage, etc.), where each stage can extend independently. This segmentation allows the payload to achieve greater extension distances while maintaining a compact retracted profile, thereby minimizing drag during flight while providing sufficient extension capability when needed.
Solution Approach 2:
The telescoping mechanism employs a nested structure where the second stage is contained within the first stage, and subsequent stages are nested within previous ones. This nesting approach allows all extension components to be stored within the payload bay when retracted, minimizing the cross-sectional area and drag during flight, while enabling progressive extension when required.
2Length of moving object
If a telescoping mechanism with multiple stages is used for payload extension, then the payload can be extended further, but the manufacturing complexity increases
Solution Approach 1:
The extension mechanism is segmented into multiple independent stages, each with its own actuation system and structural components. This segmentation allows each stage to be manufactured and tested separately, simplifying the overall manufacturing process despite the increased total extension length. Each stage can be produced using standardized procedures and then assembled into the complete telescoping system.
3Ease of operation
If a payload actuator system is used to move the rack between positions, then the payload extension and retraction can be controlled, but the device complexity increases
Solution Approach 1:
The actuator system is designed to perform multiple functions: it can extend the payload forward, retract it to the bay, and potentially control intermediate positions. By using a multi-functional actuator design that can handle both extension and retraction operations, the system reduces the need for separate actuators for each direction, thereby managing complexity while maintaining ease of operation.
Data Source
AI summary
A system is described and includes a rack for carrying payload disposed in a payload bay; and a payload extension assembly for affecting linear translation of the rack between a first position in which the rack is fully retracted within the payload bay and a second position in which the payload extension assembly is fully extended and the rack is supported outside the payload bay. The payload extension assembly comprises forward and aft tracks respectively attached to forward and aft walls of the payload bay; a first stage for providing linear translation of the rack relative to the forward and aft tracks; and a second stage for providing linear translation of the rack relative to the first stage. The system further comprises a payload actuator system for selectively causing the rack extension assembly to move the rack between the first and second positions.