A simple-shear rheometer for linear viscoelastic characterization of vocal fold tissues at phonatory frequencies

Roger W. Chan, Maritza L. Rodriguez

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

Previous studies reporting the linear viscoelastic shear properties of the human vocal fold cover or mucosa have been based on torsional rheometry, with measurements limited to low audio frequencies, up to around 80 Hz. This paper describes the design and validation of a custom-built, controlled-strain, linear, simple-shear rheometer system capable of direct empirical measurements of viscoelastic shear properties at phonatory frequencies. A tissue specimen was subjected to simple shear between two parallel, rigid acrylic plates, with a linear motor creating a translational sinusoidal displacement of the specimen via the upper plate, and the lower plate transmitting the harmonic shear force resulting from the viscoelastic response of the specimen. The displacement of the specimen was measured by a linear variable differential transformer whereas the shear force was detected by a piezoelectric transducer. The frequency response characteristics of these system components were assessed by vibration experiments with accelerometers. Measurements of the viscoelastic shear moduli (G′ and G″) of a standard ANSI S2.21 polyurethane material and those of human vocal fold cover specimens were made, along with estimation of the system signal and noise levels. Preliminary results showed that the rheometer can provide valid and reliable rheometric data of vocal fold lamina propria specimens at frequencies of up to around 250 Hz, well into the phonatory range.

Original languageEnglish (US)
Pages (from-to)1207-1219
Number of pages13
JournalJournal of the Acoustical Society of America
Volume124
Issue number2
DOIs
StatePublished - 2008

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rheometers
shear
shear properties
audio frequencies
piezoelectric transducers
accelerometers
transformers
frequency response
Fold
low frequencies
harmonics
vibration

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

Cite this

A simple-shear rheometer for linear viscoelastic characterization of vocal fold tissues at phonatory frequencies. / Chan, Roger W.; Rodriguez, Maritza L.

In: Journal of the Acoustical Society of America, Vol. 124, No. 2, 2008, p. 1207-1219.

Research output: Contribution to journalArticle

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