1limited
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St John's Innovation Centre, Cowley Road CB4 0WS
Cambridge
Royaume-Uni
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Quelques documents de 1limited
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High performance piesoelectric array devices for digital loudspeakers and steered array antennas (PADS)
PADS Sujets :
Environmental Protection, Economic Aspects, Safety, Industrial Manufacture, Innovation, Technology Transfer
Type de contrat :
Cost-sharing contracts
Participants :
UNIVERSITY OF BIRMINGHAM UNITED KINGDOM
UNIVERSITY OF BIRMINGHAM
THE IRC IN MATERIALS FOR HIGH PERFORMANCE APPLICATION PO Box 363 Elms Road North Campus B15 2TT UNITED KINGDOM
UNIVERSITY OF ERLANGEN-NUREMBERG DEUTSCHLAND
UNIVERSITY OF ERLANGEN-NUREMBERG
INSTITUT FÜR WERKSTOFFWISSENSCHAFTEN LEHRSTUHL FÜR GLAS UND KERAMIK Martensstr. 5 91058 DEUTSCHLAND
1...LIMITED UNITED KINGDOM
1...LIMITED
St John's Innovation Centre, Cowley Road CB4 0WS UNITED KINGDOM
INSTITUT POUR LE DÉVELOPPEMENT DE LA SCIENCE, L'EDUCATION ET LA TECHNOLOGIE FRANCE
INSTITUT POUR LE DÉVELOPPEMENT DE LA SCIENCE, L'EDUCATION ET LA TECHNOLOGIE
LABORATOIRE ONDES ET ACOUSTIQUE Rue Vauquelin 10 75231 FRANCE
HAIKUTECH HOLDING B.V. NEDERLAND
HAIKUTECH HOLDING B.V.
Dorpstraat 100A 6274 NN NEDERLAND
UNIVERSITY OF MANCHESTER INSTITUTE OF SCIENCE AND TECHNOLOGY UNITED KINGDOM
UNIVERSITY OF MANCHESTER INSTITUTE OF SCIENCE AND TECHNOLOGY
DEPARTMENT OF MECHANICAL, AEROSPACE AND MANUFACTURING ENGINEERING APPLIED MECHANICS DIVISION Sackville Street M60 1QD UNITED KINGDOM
BOOKHAM TECHNOLOGY United Kingdom
BOOKHAM TECHNOLOGY
90 Milton Park OX14 4RY United Kingdom
No existing technology can produce linear-actuators which are long-travel, low cost, small-size, high-efficiency and high-speed. Arrays of such devices would enable Digital-Loudspeakers (DLS) and low-cost Low-Earth-Orbit satellite-traking Phased-Array-Antennas(PAA), which would provide consumers with improved sound quality and communications. We will develop a novel long-travel actuator based on a piezoelectric ceramic helix, a gas-filled rolling bearing an a light-weight piston. The objectives are to fabricate these materials and devices; to design, analyse, fabricate and test arrays of actuators; and to develop feasibility prototypes of the DLS and the PAA. This will also involve developments in digital-signal-processing electronics and software, and a new type of sound-absorbing structure based on aerogels. The results will include new ceramic processing routes, the novel actuator, and a protoype DLS and PAA. The materials and devices will have other potential applications.
Hide achievements
1.Two high displacement piezoelectric transducers were developed in the project: -an audio transducer using a Helimorph(r) piezo actuator; -an optical shutter using an S-morph stack piezo actuator. The Helimorph(r) actuator is a coiled-coil piezoelectric bender and the S-morph Stack a split-bender-stack; both are compact and capable of several mm of displacement, equivalent to over 100% strain in a selected dimension. 2. Piezoelectric manufacturing processes were developed to produce the actuators by a number of routes: -Bi-layer, multi-turn and tapered Helimorph(r) devices by Viscous Plastic Processing -Multi-layer Helimorph(r) devices by Tape Casting; -S-morph Stacks from Solufil and tape cast tapes. 3. Wide range piezoelectric loudspeakers were demonstrated, operating from 120 Hz to 20 kHz. 4. A Digital Loudspeaker comprising an array of 42 piezoelectric transducers was demonstrated. Conventional drive produced acceptable sound; novel Unary drive delivered both greater output (higher SPL) and a smoother frequency response, although accompanied by significant noise. 4. An optical shutter incorporating a piezoelectric actuator was demonstrated. 5. A high performance sound absorber with exceptional attenuation down to low frequencies (100 Hz) was demonstrated.
Source :
cordis
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