Gooseneck Hinge Vibration Damping in Aircraft Turbojet Cowl
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Solution Overview
Problem
The gooseneck fittings in bypass turbojet engines vibrate when the mobile cowl is in the closed position, disrupting airflow and posing maintenance challenges.
Innovation Solution
Incorporating anti-vibration means, such as a spring leaf bent into an L-shape with one end fixed to the structure and the other end resting against the gooseneck fitting, to prevent vibration by exerting pressure when the mobile cowl is closed, and a protective pad to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gooseneck fittings are used to allow the mobile cowl to rotate while maintaining airflow, then the airflow along the secondary flow path is improved, but the gooseneck fittings vibrate when the mobile cowl is in the closed position
Solution Approach 1:
The patent applies beforehand cushioning by introducing anti-vibration means (such as dampers or shock-absorbing elements) that are pre-installed on the gooseneck fittings. These means are designed to absorb vibrations before they propagate through the structure, thereby preventing the harmful effects of vibration while maintaining the rotational functionality of the mobile cowl and stable airflow along the secondary flow path.
2Ease of operation
If the mobile cowl is designed to rotate via hinges for maintenance access, then ease of operation is improved, but the hinges may generate vibration when closed
Solution Approach 1:
The patent applies beforehand cushioning by incorporating anti-vibration means into the hinge assembly before the vibration problem occurs. These pre-installed dampers or shock-absorbing elements are designed to mitigate vibrations generated when the mobile cowl is closed, allowing the hinge to maintain its rotational functionality for maintenance access while preventing harmful vibrations during operation.
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 anti-vibration means effectively prevent gooseneck fitting vibration, ensuring uninterrupted airflow and facilitating maintenance by stabilizing the hinges during the closed position.
Implementation Method 1
the bypass turbojet engine comprises anti-vibration means which are configured to exert pressure against the gooseneck fitting when the mobile cowl is in the closed position
Implementation Method 2
The presence of the anti-vibration means prevents the gooseneck fitting from vibrating when the mobile cowl is in the closed position
Data Source
AI summary
A bypass turbojet engine comprising a fixed structure, a central core and a cowl comprising a fixed part and a mobile cowl mounted with the ability to rotate on the fixed structure between a closed position and an open position via hinges with gooseneck fitting. At least one hinge with gooseneck fitting comprises a gooseneck fitting having one end mounted in articulated manner on the mobile cowl and one end mounted in an articulated manner on the fixed structure, the bypass turbojet engine comprises anti-vibration means which are configured to exert pressure against the gooseneck fitting when the mobile cowl is in the closed position.