Aeronautic Engine Housing Metallisation for Electrical Conductivity
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Solution Overview
Problem
Gas turbine engine fan retention housings made of composite materials face challenges in conducting electricity effectively, leading to potential damage from electromagnetic interference and temperature increases due to inadequate electrical power evacuation, limiting their use in aggressive electromagnetic environments and high temperatures.
Innovation Solution
A housing made of electrically insulating composite material with a fibrous reinforcement densified by a polymer matrix, incorporating an electrically conductive connection path connected to metal pieces via flanges, which includes metal-metal contacts and ground braids to distribute loads and intensities, ensuring proper electrical conduction and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a housing made of composite material (fibrous reinforcement densified by polymer matrix) is used, then weight is reduced and manufacturing flexibility is improved, but electrical conductivity deteriorates and temperature resistance is limited
Solution Approach 1:
The patent applies composite materials by combining the polymer matrix composite housing with metallic connection flanges and conductive paths. The housing itself remains composite for weight reduction, while metal components are strategically integrated to provide the necessary electrical conductivity and electromagnetic interference shielding, resolving the contradiction between lightweight composite construction and electrical functionality
2Ease of manufacture
If composite material with polymer matrix is used, then ease of manufacture is improved, but temperature resistance deteriorates due to limited use temperature under one hundred degrees
Solution Approach 1:
The patent resolves the temperature limitation by creating a hybrid structure where the composite housing provides ease of manufacture and weight reduction, while metallic components (flanges, connection paths) provide high-temperature resistance and structural stability at elevated temperatures, allowing the system to operate beyond the polymer matrix temperature limit
3Adaptability or versatility
If electrical equipment is installed in the housing, then functionality is improved, but susceptibility to electromagnetic interference and lightning strikes increases due to inadequate electrical power evacuation
Solution Approach 1:
The patent introduces metallic connection flanges and conductive paths as intermediary elements between the composite housing and external grounding systems. These intermediaries provide dedicated electrical conduction pathways that safely evacuate electromagnetic energy and lightning strikes away from sensitive electrical equipment, preventing direct coupling of harmful electromagnetic effects to the equipment
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 enables the fan retention housing to function nominally in severe electromagnetic environments and high temperatures, preventing damage to electrical equipment and maintaining structural integrity by effectively distributing electrical loads and intensities, while being simple to produce at a moderate cost.
Implementation Method 1
an electrically conductive connection path, where the housing is made of electrically insulating material and comprises at least one first connecting flange, adapted to fix the housing to the first metal piece, the connection path being connected to the first metal piece by means of said first connecting flange
Implementation Method 2
when electrical energy cannot be evacuated, it causes a substantial rise in temperature of the housing by joule effect
Data Source
AI summary
The invention relates to an aeronautic engine (1), comprising:a housing (10), made of electrically insulating material,a first metal piece (2, 3), andelectrical equipment (30), fixed to the housing (10) and connected to the first metal piece (2, 3) by means of an electrically conductive connection path (16, 18) and a first connecting flange (12, 14) of the housing (10).