Turbine Engine Mounting Beam With Shear Fasteners
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Solution Overview
Problem
Existing turbine engine mounting assemblies to pylons require large diameter fasteners to handle tension loads, increasing weight and cost due to the need for structures to carry these loads out of the plane, which is inefficient.
Innovation Solution
The assembly employs a combination of radial tension and shear fasteners, with shear pins and a webbed shear-resistant beam to distribute loads, reducing the need for large diameter fasteners and minimizing weight and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If large diameter fasteners are used to handle tension loads, then the structural strength is improved, but the weight and cost of the mounting assembly increase significantly
Solution Approach 1:
The fastening system is segmented into two distinct types of fasteners: tension fasteners (first fasteners) and shear fasteners (second fasteners). This segmentation allows each type of fastener to be optimized for its specific loading condition, enabling the use of smaller, lighter fasteners overall while maintaining the required structural strength.
Solution Approach 2:
The invention introduces a new dimension to the fastening system by adding shear fasteners that act in a different orientation and loading mode (shear vs. tension). This dimensional addition to the fastening approach allows the system to handle loads more efficiently without requiring oversized tension fasteners.
2Strength
If large diameter fasteners are used to accommodate tension loads, then the load-bearing capacity is improved, but the manufacturing cost increases
Solution Approach 1:
By segmenting the fastening function into tension and shear components, each fastener type can be manufactured to precise specifications appropriate for its loading condition. This avoids the need to manufacture expensive, oversized fasteners and allows for more economical, specialized fastener production.
Solution Approach 2:
The invention changes the parameters of the fastening system by specifying different fastener types with different geometric and material parameters optimized for their respective loading modes. This parameter optimization reduces manufacturing costs while maintaining load-bearing capacity.
3Stability of the object's composition
If structures are designed to carry tension loads out of the plane, then the structural integrity is improved, but the weight and complexity increase significantly
Solution Approach 1:
The structural system is segmented into components that handle tension loads (mounting beam fitting, pylon) and components that handle shear loads (mounting beam flange, shear fasteners). This segmentation eliminates the need for heavy out-of-plane structures by allowing in-plane shear fasteners to carry the appropriate loads.
Solution Approach 2:
Instead of using out-of-plane structures to carry tension loads, the invention inverts the approach by using in-plane shear fasteners to carry shear loads and separate tension fasteners to carry tension loads directly, eliminating the need for heavy out-of-plane structural elements.
Data Source
Figure 1
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AI summary
An assembly for mounting a turbine engine to a pylon includes a mounting beam, a plurality of fasteners, a first mounting linkage and a second mounting linkage. The mounting beam includes a mount beam fitting that extends axially between a first mount beam end and a second mount beam end, and a mount beam flange that extends radially out from the mount beam fitting at the first mount beam end. A first fastener aperture extends radially through the mount beam fitting, and a second fastener aperture extends axially through the mount beam flange. The fasteners connect the mounting beam to the pylon. A first of the fasteners is mated with the first fastener aperture, and a second of the fasteners is mated with the second fastener aperture. The first mounting linkage connects the first mount beam end to a first engine attachment. The second mounting linkage connects the second mount beam end to second engine attachments.