Power Optimization of Ultrasonic Friction-Modulation Tactile Interfaces

Author

Wiertlewski, Michael ; Colgate, J. Edward

Author_Institution

Dept. of Mech. Eng., Northwestern Univ., Evanston, IL, USA

Volume

8

Issue

1

fYear

2015

fDate

Jan.-March 1 2015

Firstpage

43

Lastpage

53

Abstract

Ultrasonic friction-modulation devices provide rich tactile sensation on flat surfaces and have the potential to restore tangibility to touchscreen. To date, their adoption into consumer electronics has been in part limited by relatively high power consumption, incompatible with the requirements of battery-powered devices. This paper introduces a method that optimizes the energy efficiency and performance of this class of devices. It considers optimal energy transfer to the impedance provided by the finger interacting with the surface. Constitutive equations are determined from the mode shape of the interface and the piezoelectric coupling of the actuator. The optimization procedure employs a lumped parameter model to simplify the treatment of the problem. Examples and an experimental study show the evolution of the optimal design as a function of the impedance of the finger.

Keywords

consumer electronics; energy conservation; haptic interfaces; human computer interaction; lumped parameter networks; optimisation; piezoelectric actuators; touch sensitive screens; actuator; constitutive equations; consumer electronics; energy efficiency optimization; finger interaction; lumped parameter model; mode shape; optimal design evolution; optimal energy transfer; performance optimization; piezoelectric coupling; power optimization; tactile sensation; touchscreen; ultrasonic friction-modulation tactile interface; Acoustics; Actuators; Friction; Glass; Impedance; Shape; Ultrasonic; haptics; surface haptics; tactile interface; variable friction;

fLanguage

English

Journal_Title

Haptics, IEEE Transactions on

Publisher

ieee

ISSN

1939-1412

Type

jour

DOI

10.1109/TOH.2014.2362518

Filename

6919307