Stirling Dynamics

C L A R e T : C o n t r o l a n d A l l e v i a t i o n o f L o a d s i n A d v a n c e d

R e g i o n a l T u r b o - F a n C o n f i g u r a t i o n s

S i m o n H a n c o c k ( S t i r l i n g D y n a m i c s ) , N a o m i A l l e n ( A R A ) , J o n a t h a n C o o p e r ( L i v e r p o o l U n i v e r s i t y )

D e c e m b e r 8 t h 2 0 1 1

Clean Sky

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What is Clean Sky?

• Funded by the European Commission• Less stringent rules than FP7• No restriction on number of partners or nationalities

• Aim• Develop more fuel-efficient, less noisy aircraft

• Themes• Green Rotorcraft• Regional Aircraft• Eco-Design• Engines• Smart Fixed-Wing• Green Operations

Clean Sky Aims

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• Develop and mature new technologies for regional aircraft in the field of advanced aerodynamics, advanced materials and structures, onboard all electric systems and avionics architectures, to satisfy Regional aviation Clean Sky target reduction with respect to 2000 reference technologies.

• Integration of these technologies in advanced regional aircraft configurations with new power-plants

• Advanced technologies will be validate through a mix of ground and flight tests

Clean Sky Technology Development

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• Advanced composite (multifunctional Layers/Multilayer with thermoplastic layers, metal meshes, enhanced damping layers).

• Advanced metallic structures based on laser welded lighter aluminium alloys.

• Structural Health Monitoring based on advanced sensors (Optical, acoustic and wireless).

• High Lift Devices, Main & Nose Landing Gears for noise reduction.

• Active Load Control, Load Alleviation and Laminar Flow for highly-efficient aerodynamics

• Electrical and electronic technologies for energy management solution

• New avionics architectures and functionalities for missions and trajectory optimization

Green Regional Aircraft

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JTI-CS-2010-5-GRA-02-014

Wing loads control/alleviation system design for advanced regional Turbo-Fan A/C configuration

Tasks

• LC&A wing devices aerodynamic sizing• Device concepts feasibility and development• Device Parametric Analysis

Current Status

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• Project team of Liverpool University, ARA and Stirling Dynamics• Bid submitted December 2010• Project awarded January 2011

• Technical inputs to project• Awaiting completion of preceding project, AWAHL project to

provide baseline wing design (mid Nov)• Some background development on devices completed at

Liverpool University

• Project due to start in December

Extension upon State of the Art

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• Development of a novel adaptive winglet /wingtip concept based upon chiral structures that combines a drag minimization capability with the capacity to provide passive gust loads alleviation

• Parametric design and capability assessment of the device for use on a full scale advanced regional turbo-fan aircraft, including design of the required structure and actuators

• Critical assessment of the total system requirements for the device. I.e. assess power and weight requirements vs. drag and loads alleviation (and hence weight loss) gains.

Wing-t ip Device

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Aims

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• The CLAReT project will develop a novel winglet device that is able to facilitate optimal cant angle and twist throughout the flight envelope whilst also providing an improved passive gust Loads Control and Alleviation (LC&A) capability. Specifically, the aims are to:• Perform a multi-fidelity CFD based aerodynamic design of an

innovative Loads Control & Alleviation wing device• Undertake a preliminary lay-out definition of respective structure

and actuation system for the device• Perform a parametric analysis of the device performance and

settings for a transonic wing configuration (cruise M=0.78) with engine–nacelle under wing installation for a future Turbo Fan Aircraft configuration

Object ives

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• Definition of a baseline wing model with associated FE and CFD mesh

• Definition of a baseline LC&A winglet device configuration following consideration of the design requirements

• Preliminary aerodynamic sizing of the winglet device making use of CFD analysis

• Definition of the structures and systems related to the winglet device leading to a structural design and actuator design

• Parametric evaluation of the deployed concept and evaluation compared to the baseline wing

• Parametric evaluation of the concept used in combination with conventional control actuators

Chiral Structures

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• Current work at Liverpool investigating chiral structures to control wingtip deflections

• Much larger elements• Application of torque to create deflections• 3D Chiral Structures?• Position of chiral elements?

Systems Integrat ion Aspects

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• What are the practical implications of installing such a device on an aircraft?• Need to consider

• Operating conditions• Level of automation/pilot interaction

• Major design decisions• Location• Interaction with other systems• Cost / benefit indices (Cost / Drag reduction / Weight / Risk)• Assessment of cost / benefit relative to design inputs

• Other considerations are• Manufacturing processes required• Impacts to structures and structural repair processes• Certification requirements• Reliability & Maintainability• Failure mitigation & Safety

© 2011 Stirling Dynamics13

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