Analysis of parameter estimation possibilities of the thermal contact resistance
using the laser flash method with two-layer specimens
Balázs Czél,
Keith A. Woodbury and Jonathan W. Woolley
In Draft
Volume TBD, Issue TBD, 2012
ABSTRACT
The paper presents a curve-fitting-based
calculation of the thermal contact resistance and other parameters from laser
flash measurements considering a two-layer specimen (aluminum substrate and stainless
steel film). Sensitivity analysis of different cases was used to examine the
sensitivities of the unknown parameters: thermal contact resistance, absorbed
energy, specific heat of the film, and thermal conductivity of the film. A
nonlinear curve-fitting method was applied to perform the estimation of the
unknown parameters using simulated measurements generated by the solution of
the direct problem. An extensive analysis was performed to examine which
parameters might be estimated simultaneously with the contact resistance for
different noise levels of the simulated measurement. It was concluded that in
the noiseless case all four unknown parameters can be estimated simultaneously
with high accuracy. The noise has a significant effect on the accuracy of the
parameter estimation, but, even when a reasonable noise level is present, it is
still possible to accurately estimate one or two parameters together with the
thermal contact resistance.
