New PDF release: Adaptronics and Smart Structures: Basics, Materials, Design,

By Dr. Craig A. Rogers (auth.), Prof. Dr.-Ing. habil. H. Janocha (eds.)

ISBN-10: 3662038196

ISBN-13: 9783662038192

ISBN-10: 3662038218

ISBN-13: 9783662038215

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Additional info for Adaptronics and Smart Structures: Basics, Materials, Design, and Applications

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3 What are They Made of? 23 tively produced. Experimentalvalidationof this principle was achieved with a proof- of-concept demonstrator,HAHDIS Mk 1, and frequency response curves were obtainedover the range 0- 30 Hz (Fig. 3). Another displacement amplificationprinciple that has shown remarkable results for angularmotion is the LARIS (Large- AmplitudeRotary InducedStrain) concept [10]. 9 • '5 c. HVeU 2 0 0 +-----~----~----~----+---~ 0 b 10 20 30 40 50 Forcing Frequency (Hz) Fig. 2,4. Experimentaltesting of the LARIS concept: (a) the LARIS Mk 2 proofof- concept demonstrator;(b) frequency-response curves up to 50 Hz [11] The warping- torsion coupling of an open- tube structure is utilized to transformand amplify the small axial displacementproducedby the inducedstrainactuatorand to obtain a sizable angulardeflection at the device output The LARIS Mk 2 proof- of-concept demonstrator [11] showed almost flat response up to 50Hz (Fig.

Hydraulic lines Solid-state hydraulic drive Rotary hydraulic actuator 12' PZTstack1 Adjustment screw b PZTstack2 Input block Diaphragm Containing vessel Hydraulic cfrcuits Fig. 2. The HAHDIS Mk 2 solid-state actuator: (a) proposed implementation for actuating a rotor blade active tab; (b) internal construction showing the two hydraulic chambers and the piezoelectric stacks [9] Magnetostrictive actuator materials are similar to piezoelectric materials, but respond to magnetic, rather than electric, fields.

The pyroelectric effect, which allows piezoelectric polymers to sense temperature,also limits their use to lower temperatureranges. Piezoelectric composite materials have been developed to overcome the brittlenessof piezoelectric ceramics and the temperaturelimitationsof piezoelectric polymers. Flexible composite sensors containing piezoelectric ceramic rods in a polymer-basedmatrix [17] have been widely used in hydrophones and medical ultrasonictransducers,giving improvedsensitivity and mechanical performanceover the original piezoelectric ceramics.

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Adaptronics and Smart Structures: Basics, Materials, Design, and Applications by Dr. Craig A. Rogers (auth.), Prof. Dr.-Ing. habil. H. Janocha (eds.)


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