Pneumatic Fastening for Aircraft Paneling
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Solution Overview
Problem
Conventional latching mechanisms for aircraft panels require torqueing fasteners, leading to wear, loosening, and potential hazards, while also compromising aerodynamic and low observable characteristics, and creating debris issues during installation and removal.
Innovation Solution
A pneumatic fastening mechanism using translatable panel engagement mechanisms that adjust between locking and releasing configurations in response to fluid pressure changes, allowing panels to be elevated and separated without surface contact, ensuring flush installation and minimizing surface irregularities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fasteners (screws) are used to attach panels, then the panel can be securely fastened to the aircraft surface, but the fasteners require torqueing which causes wear, loosening, and creates hazardous debris during installation and removal
Solution Approach 1:
The patent replaces the conventional mechanical screw fastening system with a pneumatic latching mechanism. The latching mechanism uses pneumatic pressure to engage and disengage panel receptacles from support member protrusions, eliminating the need for screws and associated torqueing operations. This substitution eliminates fastener wear, loosening, and debris generation while maintaining secure panel attachment.
Solution Approach 2:
The patent implements a pneumatic latching mechanism that uses compressed air or gas pressure to control the engagement and disengagement of panel fasteners. The pneumatic system acts on the latching mechanism to translate pressure changes into mechanical movement, enabling tool-free installation and removal of panels while maintaining secure attachment during operation.
2Reliability
If conventional fasteners are used to attach panels, then the panel can be securely fastened, but the fasteners create surface irregularities that compromise aerodynamic characteristics and low observable properties
Solution Approach 1:
The patent replaces protruding mechanical fasteners with a flush-mounted pneumatic latching mechanism. The receptacles and protrusions are designed to be substantially flush with the panel and support member surfaces respectively, eliminating the need for visible fasteners on the exterior surface. This maintains the aerodynamic cleanliness and low observable characteristics of the aircraft surface.
3Reliability
If conventional fasteners are used to attach panels, then the panel can be securely fastened, but the fasteners preload the panels into undesirable levels causing structural issues
Solution Approach 1:
The patent replaces the torqueing operation required by conventional fasteners with a pneumatic latching mechanism that applies controlled engagement force. The pneumatic system can be designed to apply appropriate engagement forces without creating excessive preload or stress concentrations in the panel structure, thereby avoiding structural issues while maintaining secure attachment.
4Reliability
If conventional fasteners are used to attach panels, then the panel can be securely fastened, but the fasteners create hazardous conditions by falling into the aircraft interior during installation or removal
Solution Approach 1:
The patent replaces removable screw fasteners with a pneumatic latching mechanism that eliminates the risk of fasteners falling into the aircraft interior. The pneumatic system allows for tool-free installation and removal operations, and the latching mechanism is designed to remain attached to the panel or support member during the transition, preventing hazardous debris from entering the aircraft interior.
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
Enables easy and safe removal and installation of aircraft panels without fasteners, maintaining aerodynamic and low observable characteristics, while providing airtight and watertight sealing and reducing noise and debris risks.
Implementation Method 1
The panel engagement mechanisms are translatable from a first locking configuration to a second releasing configuration, in response to changes in fluid pressure communicated to the panel engagement mechanisms
Data Source
AI summary
A pneumatic fastening mechanism is provided for fastening an aircraft surface panel to an aircraft panel support member. The panel includes a plurality of receptacles extending from the panel lower surface. The panel support member includes a corresponding plurality of panel engagement mechanisms, disposed on the support member lower surface, and translatable through the support member to engage the receptacles. The panel engagement mechanisms are extendable from a first position, wherein the panel abuts and is engaged to the panel support member, to second position wherein the panel is elevated above the panel support member upper surface where the panel may be unlocked and separated from the panel engagement mechanism. The panel engagement mechanism is operative to elevate and release the panel in response to changes in fluid pressure communicated to the panel engagement mechanisms.