Jorge C. Lucero

10-18-2000, 10:29 PM

Hi:

I am working on computer simulations of the vibration of the human vocal

folds. For the simulations, each vocal fold is modelled as two coupled

mass-damper-stiffness system (two-mass model, Ishizaka and Flanagan,

1972). This model assumes a linear damping proportional to the fold

velocity ( with a term rv, where r is the damping coefficient and v the

fold velocity). However, I have noted that I get better results if I

replace this linear term by a nonlinear one of the form r(1+k|x|)v (or

also r(1+kx^2)v), where k is a coefficient and x is the fold displacement.

Now, this is only an observation from computer simulations, so I wonder if

there is some experimental evidence on tisue biomechanics which might

provide some support for using this kind of nonlinear damping. I have

checked the literature I have without success; so, could anyone help me

with some references (if available) or suggestions?

Thanks in advance,

Jorge

--

Jorge C. Lucero

Department of Mathematics

University of Brasilia

lucero@mat.unb.br

http://www.mat.unb.br/~lucero/

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I am working on computer simulations of the vibration of the human vocal

folds. For the simulations, each vocal fold is modelled as two coupled

mass-damper-stiffness system (two-mass model, Ishizaka and Flanagan,

1972). This model assumes a linear damping proportional to the fold

velocity ( with a term rv, where r is the damping coefficient and v the

fold velocity). However, I have noted that I get better results if I

replace this linear term by a nonlinear one of the form r(1+k|x|)v (or

also r(1+kx^2)v), where k is a coefficient and x is the fold displacement.

Now, this is only an observation from computer simulations, so I wonder if

there is some experimental evidence on tisue biomechanics which might

provide some support for using this kind of nonlinear damping. I have

checked the literature I have without success; so, could anyone help me

with some references (if available) or suggestions?

Thanks in advance,

Jorge

--

Jorge C. Lucero

Department of Mathematics

University of Brasilia

lucero@mat.unb.br

http://www.mat.unb.br/~lucero/

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To unsubscribe send SIGNOFF BIOMCH-L to LISTSERV@nic.surfnet.nl

For information and archives: http://isb.ri.ccf.org/biomch-l

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