Rotor Blade Control Cuff Manufacturing Automation
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Solution Overview
Problem
The manufacturing of control cuffs for hinge- and bearingless rotor blades is labor-intensive and costly, particularly due to the use of short reinforcing fibers and labor-intensive prepreg hand layup methods, which can weaken the cuffs and require additional stiffener layers for stiffness.
Innovation Solution
A method involving the automated manufacturing of a stiffener member using fiber winding, 3D printing, or 3D milling, which is then bonded to an outer shell using an adhesive, reducing material usage and costs, and eliminating the need for uni-directional fiber layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If labor-intensive prepreg hand layup methods with short reinforcing fibers are used, then manufacturing flexibility is achieved, but manufacturing costs increase and cuff strength decreases
Solution Approach 1:
The control cuff is divided into two distinct components: an outer shell made by automated processes and a separate stiffener member made by automated fiber winding. This segmentation allows each component to be optimized independently - the outer shell provides the basic structure while the stiffener member provides targeted reinforcement, eliminating the need for labor-intensive hand layup of entire cuffs while maintaining or improving strength.
Solution Approach 2:
The invention uses composite construction by combining the outer shell with a stiffener member made from fiber-reinforced material. The stiffener member comprises a matrix material with reinforcing fibers embedded therein, creating a composite structure that provides both strength and stiffness. This composite approach allows automated manufacturing while achieving the mechanical properties previously requiring manual labor.
2Productivity
If automated fiber winding is used for stiffener member, then manufacturing costs decrease and productivity increases, but structural complexity increases
Solution Approach 1:
By segmenting the control cuff into an outer shell and a stiffener member, the invention enables automated fiber winding of the stiffener member independently. This segmentation simplifies the manufacturing process for each component while allowing the use of advanced automated techniques for the stiffener, thereby increasing productivity without requiring the entire cuff structure to be complex.
Solution Approach 2:
The stiffener member is designed to provide localized reinforcement at specific positions on the control cuff where strength is most needed. This local quality approach allows automated fiber winding to target specific areas rather than requiring uniform reinforcement throughout the entire cuff, reducing material usage and simplifying the overall structure while maintaining necessary strength characteristics.
3Strength
If control cuffs are positioned at high radial distance to maintain axial length, then structural integrity is maintained, but aerodynamic drag increases
Solution Approach 1:
The outer shell is designed as a thin-walled structure that can maintain structural integrity while having reduced axial length. The shell configuration, combined with the stiffener member, provides the necessary strength to position the control cuff at a lower radial distance without compromising structural integrity, thereby reducing aerodynamic drag.
Solution Approach 2:
The composite construction of the stiffener member with fiber-reinforced material provides high strength-to-weight ratio and high stiffness-to-weight ratio, enabling the control cuff to maintain structural integrity with reduced dimensions. This allows the cuff to be positioned closer to the rotor shaft, reducing its radial distance and minimizing aerodynamic drag while maintaining necessary structural strength.
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
This approach reduces manufacturing costs and maintains the required stiffness of the control cuffs, minimizing aerodynamic drag while avoiding potential weakening from fiber orientation issues.
Implementation Method 1
bonding the stiffener member to the outer shell
Data Source
AI summary
A method of manufacturing a control cuff for a rotor blade of a hinge and bearingless rotor. The method comprises at least the steps of: manufacturing an outer shell, manufacturing a stiffener member by means of an automated process, inserting the stiffener member into the outer shell, and bonding the stiffener member to the outer shell.