Fan Blade Root Damper for Turbine Engine 1P Vibration
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Solution Overview
Problem
Unducted gas turbine engines experience significant 1P cyclic vibrations and loading due to misalignment of the incident air stream with the longitudinal centerline axis, leading to cyclic stresses, fatigue, and potential structural damage.
Innovation Solution
Incorporation of a damper system, specifically a spring-mass damper system, to mitigate these vibrations by damping the 1P loading at the fan blade root, reducing the transmission of cyclic forces to the fan disk and other engine components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a damper system is added to reduce 1P cyclic vibrations, then engine durability and reliability are improved, but device complexity increases
Solution Approach 1:
A damper assembly is introduced as an intermediary component between the fan blade root and the fan disk. This damper includes a damper hub, damper blades, and a spring-mass system that mediates the vibrational forces, absorbing 1P cyclic vibrations before they reach the fan disk and other engine components, thereby improving reliability while managing the added complexity through a modular design
2Strength
If damper components are made larger to handle 1P loading, then strength and durability are improved, but weight and cost increase
Solution Approach 1:
The damper design utilizes spring-mass elements with optimized stiffness and mass parameters to absorb 1P vibrations. By carefully selecting the spring constant and mass values, the damper achieves sufficient strength to handle vibrational loads while maintaining a compact, lightweight design. The spring-mass system allows the damper to be smaller and lighter than a purely rigid structural solution would require
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 damper system effectively reduces 1P loading and cyclic vibrations, enhancing engine durability, allowing for smaller, less expensive components and potentially longer maintenance intervals, while improving overall engine performance and reducing operational costs.
Implementation Method 1
a damper positioned radially between the fan blade root and the fan disk, damping the 1P vibrations
Implementation Method 2
Incorporation of a damper system, specifically a spring-mass damper system, to mitigate these vibrations
Data Source
AI summary
A turbine engine experiences 1P vibrations. The turbine engine includes a turbo-engine, a compressor for compressing air, and a combustor for combusting fuel and the compressed air to generate combustion gases. A turbine receives the combustion gases and drives a fan assembly. The fan assembly includes a fan disk and a fan blade with a fan blade centerline axis. The fan blade is subjected to 1P loading, generating the 1P vibrations. A fan blade root fixed to the fan blade and connected to the fan disk, is aligned with the fan blade centerline axis, and conducts the 1P vibrations. A damper positioned radially between the fan blade root and the fan disk damps the 1P vibrations.