Miniaturised acoustofluidic tactile haptic actuator

Akther, A, Oliveira Almeida Camara Castro, J, Shaegh, S, Rezk, A and Yeo, L 2019, 'Miniaturised acoustofluidic tactile haptic actuator', Soft Matter, vol. 15, no. 20, pp. 4146-4152.


Document type: Journal Article
Collection: Journal Articles

Title Miniaturised acoustofluidic tactile haptic actuator
Author(s) Akther, A
Oliveira Almeida Camara Castro, J
Shaegh, S
Rezk, A
Yeo, L
Year 2019
Journal name Soft Matter
Volume number 15
Issue number 20
Start page 4146
End page 4152
Total pages 7
Publisher The Royal Society of Chemistry
Abstract Tactile haptic feedback is an important consideration in the design of advanced human-machine interfaces, particularly in an age of increasing reliance on automation and artificial intelligence. In this work,we show that the typical nanometer-order surface displacement amplitudes of piezoelectric transducers-which are too small to be detectable by the human touch, and constitute a significant constraint in their use for tactile haptic surface actuation-can be circumvented by coupling the vibration into a liquid to drive the deflection of a thermoplastic membrane. In particular, transmission of the sound energy from the standing wave vibration generated along a piezoelectric transducer into a microfluidic chamber atop which the membrane is attached is observed to amplify the mechanical vibration signalling through both the acoustic radiation pressure and the viscous normal stress acting on the membrane-the latter arising due to the acoustic streaming generated as the sound wave propagates through the liquid-to produce 100 mm-order static deflections of the membrane, upon which approximately 0.5 mm dynamic vibrations at frequencies around 1 kHz are superimposed; both these static and dynamic responses are within the perception range for human finger sensation. The large static deformation, the relatively fast response time, and the ability to incorporate a dynamic vibrotactile response together with the small size and potential for integration of the device into large scale arrays make this mechanism well suited for driving actuation in devices which require tactile haptic responses.
Subject Chemical Engineering Design
Keyword(s) Acoustic radiators
Acoustic wave propagation
Atmospheric pressure
Haptic interfaces
Piezoelectric transducers
Piezoelectricity
Transducers
DOI - identifier 10.1039/c9sm00479c
Copyright notice © The Royal Society of Chemistry 2019
ISSN 1744-6848
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