Multi-Material Ducted Rotor Blade Tip Extension for Tight Clearance
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Solution Overview
Problem
Designing rotor blade extensions for ducted rotor systems that improve certain aspects like power efficiency and noise without disrupting others is challenging due to manufacturing and operational tolerances that make it difficult to maintain a constant tight clearance distance between rotor blades and the rotor duct.
Innovation Solution
Implementing a multi-material rotor blade tip extension with a structural inboard portion and compliant outboard portion, using materials like composite and elastomer, to provide a fixed extended length and flexibility, minimizing clearance distance and absorbing unintended contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rigid rotor blade tip extension is used to maintain a fixed clearance distance, then the clearance distance is constant, but the extension is susceptible to damage from unintended contacts
Solution Approach 1:
The patent changes the physical state and mechanical properties of the tip extension material from rigid to compliant, allowing it to deform elastically under load. This parameter change enables the extension to maintain its shape and clearance distance under normal operation while absorbing impact energy from unintended contacts through elastic deformation, thereby resolving the contradiction between maintaining precise clearance and resisting damage.
Solution Approach 2:
The patent employs composite material construction for the tip extension, combining materials with different properties to achieve both dimensional stability and impact resistance. The composite structure allows the extension to maintain its geometric integrity and clearance distance while the compliant material components absorb impact forces, simultaneously satisfying both the precision clearance requirement and the damage resistance requirement.
2Reliability
If the rotor blade tip extension is made compliant to absorb unintended contacts, then damage resistance is improved, but the clearance distance becomes variable
Solution Approach 1:
The patent utilizes the elastic properties of compliant materials, which allow the material to deform under stress and return to its original shape when the stress is removed. This elastic parameter enables the tip extension to absorb impact energy from unintended contacts while maintaining its overall geometry and clearance distance, resolving the apparent contradiction between compliance and precision.
3Reliability
If a multi-material tip extension is used to provide both structural integrity and flexibility, then both clearance maintenance and damage absorption are improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the tip extension into distinct material zones or layers, with each zone fabricated from a different material optimized for its specific function. This segmentation allows the use of rigid materials in areas requiring structural support and compliant materials in areas requiring impact absorption, while the modular nature of segmented construction simplifies the manufacturing process compared to creating a fully integrated multi-material component.
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
Enhances ducted rotor system effectiveness by maintaining optimal clearance and reducing damage from unintended contacts, while being cost-effective and easily manufacturable.
Implementation Method 1
a multi-material tip extension with a structural inboard portion and compliant outboard portion, using materials like composite and elastomer, to provide a fixed extended length and flexibility, minimizing clearance distance and absorbing unintended contacts
Data Source
AI summary
A rotor system is provided in one example embodiment and may include a rotor duct; at least one rotor blade, wherein the at least one rotor blade comprises a tip end; and a multi-material tip extension affixed at the tip end of the at least one rotor blade, wherein the multi-material tip extension comprises an inboard portion fabricated from a first material and an outboard portion fabricated from a second material, wherein the second material is different than the first material.