Aircraft Vacuum Waste System Lightweight Assembly
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Solution Overview
Problem
Conventional vacuum waste systems in aircraft are heavy, increasing aircraft weight and fuel consumption, and are prone to tampering due to tool-free removal of toilet bowls.
Innovation Solution
A lightweight vacuum waste system comprising a base assembly and a toilet bowl assembly with a secure mounting mechanism using a tool-operated fastener, featuring a lattice-type frame structure and bayonet mounts for secure attachment to a base plate, reducing weight and preventing unauthorized removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional frame structure is used to support the toilet bowl at standard height, then the toilet bowl is securely mounted, but the aircraft weight increases significantly
Solution Approach 1:
The mounting structure is divided into separate components: a base plate that attaches to the aircraft structure, and a base assembly that attaches to the base plate. This segmentation allows each component to be optimized independently for strength and weight, reducing overall weight while maintaining mounting security.
Solution Approach 2:
The base plate and base assembly utilize composite construction with lightweight materials that provide high strength-to-weight ratio. The lattice-type frame structure in the base assembly uses optimized material distribution to achieve maximum structural integrity with minimum weight.
2Ease of operation
If the toilet bowl is designed for tool-free removal, then ease of maintenance is improved, but the system becomes prone to tampering
Solution Approach 1:
The mounting mechanism transitions from a static fixed connection to a dynamic tool-operated fastening system. The fasteners can be quickly engaged and disengaged with appropriate tools, providing secure mounting during operation while allowing controlled access for authorized maintenance.
Solution Approach 2:
Different security levels are applied to different parts of the mounting system. The base assembly uses tool-operated fasteners for secure attachment, while the toilet bowl interface maintains ease of access. This localized differentiation of security and accessibility properties resolves the contradiction between anti-tampering and maintenance ease.
3Weight of moving object
If a lightweight base assembly is used, then aircraft weight is reduced, but structural strength may be compromised
Solution Approach 1:
The base assembly is segmented into a lattice-type frame structure that distributes loads efficiently throughout the structure. This segmentation allows weight reduction in non-critical areas while maintaining strength in load-bearing regions, achieving optimal strength-to-weight ratio.
Solution Approach 2:
The structural parameters of the base assembly are optimized through lattice design and material selection. The frame structure uses varying member thicknesses and configurations to provide maximum strength with minimum weight, changing the physical parameters of the structure to resolve the weight-strength contradiction.
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 minimizes weight impact on aircraft fuel efficiency and enhances security by requiring tools for assembly and disassembly, thereby reducing fuel costs and preventing tampering.
Implementation Method 1
When the flush valve opens, the contents of the toilet bowl are removed by differential pressure to the waste tank because the air pressure in the line under vacuum is lower than ambient air pressure in a toilet bowl
Implementation Method 2
The toilet bowl assembly can have a downwardly extending members that engage in a sliding manner with horizontally extending members at the top of the base assembly to thus secure the toilet bowl assembly to the base assembly
Data Source
AI summary
A vacuum waste system for use in a vehicle, such as a aircraft. The vacuum waste system includes a lightweight base assembly and a lightweight toilet bowl assembly mounted to the top of the base assembly. The toilet bowl assembly has downwardly extending members that engage in a sliding manner with horizontally extending members at the top of the base assembly to thus secure the toilet bowl assembly to the base assembly. A fastener, such as a nut and bolt assembly, can be coupled to the toilet bowl assembly and base assembly using a tool to thus secure the toilet bowl assembly to the base assembly.