Aircraft Nacelle Visor Mounting With Centering and Spring Tensioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing aircraft visor attachment systems are bulky and complex, making mounting and adjustment difficult.
Innovation Solution
A pylon and nacelle assembly with a visor featuring two centering systems and two tensioning systems, where each tensioning system includes a threaded rod, a spring element, and an arresting mechanism, and each centering system comprises a fitting with a bore and a shaft, reducing bulk and simplifying attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional attachment means are used for the visor, then the visor can be securely attached, but the attachment means become bulky and complex
Solution Approach 1:
The attachment system is divided into separate functional modules: centering systems with shafts and bores for positioning, and tensioning systems with threaded rods and spring elements for securing. This segmentation allows each component to perform its specific function efficiently without the bulk and complexity of conventional integrated attachment means.
2Reliability
If conventional attachment means are used for the visor, then the visor can be securely attached, but mounting and adjustment become difficult
Solution Approach 1:
The centering systems are designed with shafts and bores that automatically align the visor during mounting, performing the centering action preliminarily before the tensioning systems are fully engaged. This preliminary centering action simplifies the subsequent tightening process and makes adjustment easier.
Solution Approach 2:
The tensioning systems incorporate spring elements that provide dynamic adjustment capability, allowing the attachment force to be automatically adjusted based on the visor's positioning and aerodynamic forces, thereby facilitating easier mounting and adjustment operations.
3Volume of stationary object
If the tensioning systems use threaded rods with spring elements, then the bulk of attachment means is reduced, but the mechanism becomes more intricate
Solution Approach 1:
The spring elements function as flexible components that provide tensioning force while occupying minimal space. These elastic elements replace bulky rigid tensioning mechanisms, reducing the overall volume of the attachment means while maintaining the necessary tensioning capability through their flexible deformation.
4Manufacturing precision
If the centering systems use shafts and bores, then precise positioning is achieved, but the attachment means become more complex
Solution Approach 1:
The centering systems use simple geometric copying between the shaft and bore shapes to achieve precise positioning. The cylindrical shaft fits into the corresponding cylindrical bore, creating a straightforward geometric relationship that ensures accurate alignment without requiring complex positioning mechanisms or sophisticated control systems.
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 solution reduces the bulk of attachment means, making mounting and adjustment easier while providing secure attachment of the visor, with the tensioning systems countering suction forces and centering systems ensuring precise positioning.
Implementation Method 1
a spring element, and an arresting means, wherein the first fitting has an engagement wall through which an orifice passes
Implementation Method 2
a threaded rod, a first end of which is mounted articulated on the second fitting
Data Source
AI summary
An assembly of a pylon and of a nacelle of an aircraft, wherein the nacelle has a structure, a visor, two centering systems and two tensioning systems. Each tensioning system comprises a first fitting, which is attached to the structure and has an engagement wall through which an orifice passes, a second fitting, which is attached to the visor, a threaded rod that is articulated on the second fitting and passes through the orifice, a spring element fitted on the threaded rod against the opposite face of the engagement wall from the second fitting, and an arresting means that blocks the spring element. Each centering system comprises a first fitting, which is attached to the structure and has a bore, and a second fitting, which is attached to the visor and bears a shaft that is accommodated in the bore.