TY - JOUR

T1 - A nonlinear inverse problem in estimating the heat flux of the disc in a disc brake system

AU - Yang, Yu Ching

AU - Chen, Wen Lih

N1 - Funding Information:
This work was supported by the National Science Council, Taiwan, Republic of China , under the grant numbers NSC 98-2221-E-168-035 and NSC 98-2221-E-168-034 .

PY - 2011/10

Y1 - 2011/10

N2 - In this study, an inverse algorithm based on the conjugate gradient method and the discrepancy principle is applied to estimate the unknown space- and time-dependent heat flux of the disc in a disc brake system from the knowledge of temperature measurements taken within the disc. In the direct problem, the specific heat and thermal conductivity are functions of temperature; hence this is a nonlinear inverse problem. The temperature data obtained from the direct problem are used to simulate the temperature measurements, and the effect of the errors in these measurements upon the precision of the estimated results is also considered. Results show that an excellent estimation on the space- and time-dependent heat flux can be obtained for the test cases considered in this study. The current methodology can be also applied to the prediction of heat flux in the pads, and then the heat partition coefficient between the disc and the pad in a brake system can be calculated.

AB - In this study, an inverse algorithm based on the conjugate gradient method and the discrepancy principle is applied to estimate the unknown space- and time-dependent heat flux of the disc in a disc brake system from the knowledge of temperature measurements taken within the disc. In the direct problem, the specific heat and thermal conductivity are functions of temperature; hence this is a nonlinear inverse problem. The temperature data obtained from the direct problem are used to simulate the temperature measurements, and the effect of the errors in these measurements upon the precision of the estimated results is also considered. Results show that an excellent estimation on the space- and time-dependent heat flux can be obtained for the test cases considered in this study. The current methodology can be also applied to the prediction of heat flux in the pads, and then the heat partition coefficient between the disc and the pad in a brake system can be calculated.

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U2 - 10.1016/j.applthermaleng.2011.04.008

DO - 10.1016/j.applthermaleng.2011.04.008

M3 - Article

AN - SCOPUS:79960900400

VL - 31

SP - 2439

EP - 2448

JO - Journal of Heat Recovery Systems

JF - Journal of Heat Recovery Systems

SN - 1359-4311

IS - 14-15

ER -