In order to understand the e ect of small scale forcing on turbulent o ws and its implications on control, an experimental investigation is made into the forcing of the inertial scales in the wall region of a turbulent boundary layer. A wall-mounted resonant actuator is used to produce a local vortical structure in the streamwise direction which is convected downstream by the boundary layer ow. The frequency associated with this structure is governed by the resonant frequency of the device and falls in the range of the inertial scales at the Reynolds number of the experiment Re 1200. Single and multiple point measurements have been made to determine mean and uctuating statistics as well as dual-point correlations. These data can be used to infer changes in the structure of the near wall region of the boundary layer that are due to the actuator forcing and subsequently, to construct transfer functions between the actuator and the uid necessary for active control.
If you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation. AbstractPurpose -This paper seeks to focus on material combinations for flexible matrix composites (FMCs) and the production methods thereof. These materials enable a high flexibility in one direction while being very stiff in the other. Design/methodology/approach -Tested were rubber, silicone and thermoplastic elastomer matrices with carbon fibers using different production methods. These tests focused on the impregnation of the fibers with the different matrices and the orthotropy of the produced materials. Findings -In the paper, a production capability for large quantities of easy to use off-the-shelf material was developed. The produced material handles similar to prepreg material known from "classical" composite materials. Test specimens were manufactured and characterized for mechanical properties using tensile tests. Originality/value -These FMC materials are envisaged for a new pneumatic actuation system for an aircraft's droop nose to replace the electro-mechanical system designed in the SADE and SmartLED projects. Combining a tube-like geometry and a variable fiber-angle lay-up enables a wide range of deformation possibilities (large design freedom of movement behaviour).
Since more than 10 years EADS Innovation Works, which is the corporate research centre of EADS (European Aeronautic Defence and Space Company), is investigating smart materials and adaptive structures for aircraft in cooperation with EADS business units. Focus of research efforts are adaptive systems for shape control, noise reduction and vibration control of both fixed and rotary wing aircraft as well as for lift optimisation of fixed wing aircraft.Two outstanding adaptive systems which have been pushed ahead in cooperation with Airbus Germany and Eurocopter Germany are adaptive servo flaps for helicopter rotor blades and innovative high lift devices for fixed wing aircraft which both were tested in flight for the first time representing world premieres. In this paper various examples of adaptive systems are presented which were developed and realized by EADS in recent years.
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