Frequency response of human skin in vivo to mechanical stimulation
Name
48839050-MIT.pdf
Description
Full printable version
Size
2.99 MB
Format
Adobe PDF
Checksum (MD5)
8af0ac4eb5637a39069f39cbd0cbde99
Author(s)
Diller, Timothy Thomas, 1974-
Advisor(s)
Mandayam A. Srinivasan.
Date Issued
2001
Publisher
Massachusetts Institute of Technology
Abstract
The frequency-dependent response of human skin was measured, in vivo, to mechanical stimulation at a scale useful in the development of tactile displays. Sinusoidal vibration stimuli of varying frequencies and amplitudes were applied with a flat-ended 0.5 mm diameter cylindrical probe under two conditions: it was either glued to the skin or not. Both normal and tangential stimlui were applied to the skin surface in the glued case and only normal stimuli were applied in the nonglued case. The stimuli were applied to live human subjects at four body sites: the finger pad, wrist, forearm, and forehead. The force displacement response was measured and used to calculate mechanical impedance, power absorption and duty factor (an estimate of the fraction of time that the stimulator is in contact with the skin). Results showed the mechanical impedance generally increasing in magnitude with frequency and higher in magnitude for tangential stimulation than for normal stimulation. Power absorption linearly increased with frequency, and duty factor decreased with increasing frequency and amplitude. The measured properties varied widely between body sites and subjects. A mathematical model previously developed to calculate bulk and shear moduli from normal and tangential impedance data was tested against data at the four body sites. However, because the model assumed isotropy and semi-infinite thickness of the stimulated tissue, data taken did not fit the model well, especially at the finger tip.
Description
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001.
Includes bibliographical references (p. 49-51).
Subjects
Mechanical Engineering.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.
Persistent DSpace Link
