A nonlinear rheological model for the ultrasonically induced squeeze film effect in variable friction haptic displays

A squeeze film induced by ultrasonic vibration between two solid surfaces in contact can dramatically reduce the friction between them. This phenomenon, so-called the squeeze film effect, has been utilized in variable friction tactile displays for texture rendering purposes. Such tactile displays ca...

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Bibliographic Details
Published in:Korea-Australia rheology journal 2017, 29(3), , pp.219-228
Main Author: Son, Kwon Joong
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Complex Fluids and Microfluidics
Contact pressure
Coulomb friction
Displays
Food Science
Materials Science
Mechanical Engineering
Optimal control
Polymer Sciences
Rheological properties
Rheology
Sliding
Soft and Granular Matter
Solid surfaces
Stability
Tactile
Ultrasonic testing
Ultrasonic vibration
공학일반
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Summary:A squeeze film induced by ultrasonic vibration between two solid surfaces in contact can dramatically reduce the friction between them. This phenomenon, so-called the squeeze film effect, has been utilized in variable friction tactile displays for texture rendering purposes. Such tactile displays can provoke a haptic sensation to a finger pad in a controllable way. A real-time adjustment of the coefficient of lateral friction between the human finger pad and the tactile display can be accomplished by modulating the vibration amplitude of the tactile panel. Therefore, driving a reliable friction model is a key step towards designing and controlling tactile displays utilizing the squeeze film effect. This paper derives a modified Herschel- Bulkley rheological model to express the lateral friction exerted on a human fingertip via an air squeeze film as a function of the operating parameters such as the driving voltage amplitude, the finger sliding speed, and the contact pressure. In contrast to the conventional Coulomb friction model, such a rheology model can account for the sliding velocity dependence. This modeling work may contribute to the optimal control of the ultrasonic variable friction tactile displays.
ISSN:1226-119X
2093-7660
DOI:10.1007/s13367-017-0023-1