Segmented Structural Links for Fan Disk Vibration Control
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Solution Overview
Problem
Gas turbine engine fan sections experience vibrational modes during operation, which can lead to reduced operational life due to higher thermal loads and pressure ratios in next-generation turbofan engines.
Innovation Solution
The implementation of segmented structural links distributed symmetrically around the circumference of the fan disk, coupled between J-flanges and scalloped flanges, to resist vibrationally induced bending loads by transmitting loads between flanges and increasing the stiffness of the fan disk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If segmented structural links are added to increase fan disk stiffness, then vibrational resistance improves, but device complexity increases
Solution Approach 1:
The structural link is divided into multiple segments (first link segment, second link segment, third link segment) that are distributed around the circumference of the fan disk. Each segment connects to the fan disk at different locations and provides localized stiffness enhancement while allowing modular assembly and reducing overall structural complexity
Solution Approach 2:
The segmented structural links are positioned at specific locations around the fan disk circumference where they provide targeted stiffness enhancement. The links have varying geometries (different link lengths, orientations, and connection configurations) optimized for local vibrational modes rather than uniform reinforcement throughout the entire structure
2Reliability
If segmented structural links are used to resist vibrations, then operational life extends, but manufacturing complexity increases
Solution Approach 1:
The structural link system is segmented into multiple independent components that can be manufactured separately using standard fabrication processes and then assembled around the fan disk. This segmentation enables modular manufacturing, quality control of individual components, and simplified replacement or maintenance of specific segments without affecting the entire structure
Solution Approach 2:
The segmented structural links serve multiple functions: they provide stiffness enhancement, resist vibrational loads, and can be designed with standardized connection interfaces that facilitate assembly and disassembly. The same basic link geometry can be used in different configurations (different numbers of segments, different orientations) to address various vibrational modes
Data Source
Figure 1
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Figure 3A
AI summary
A segmented structural link (302; 402) may comprise a base portion (304; 404) having a first face, a tail portion (408), and a distal end having a second face. The tail portion (408) may extend at an angle relative to the first face. The tail portion (408) may comprise a first bend (406) and may further comprise a second bend (410). The base portion (304; 404) may comprise at least one of a captured nut (321; 420), a nut plate, or a self-clinching nut. A gas turbine engine with such a segmented structural link and a method of tuning a vibrational response of a fan disc are also provided.