Study on dynamic characteristics evaluation method of the cascade thermocouple system

被引：0

作者：

Yang Z. ^{[1
]}

Gu Z. ^{[1
]}

Zeng X. ^{[1
]}

Liang J. ^{[1
]}

Zhang W. ^{[1
]}

机构：

[1] Facility Design and Instrumentation Institute of China Aerodynamics Research and Development Center, Mianyang

来源：

Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | 2020年 / 41卷 / 11期

关键词：

Cascade system; Regularization method; Thermocouple; Time constant;

D O I：

10.19650/j.cnki.cjsi.J2006903

中图分类号：

学科分类号：

摘要：

To realize the precise evaluation of dynamic characteristics of the thermocouple in the circumstance of lacking the prior knowledge of excitation temperature signal, an evaluation method for the time constant of the temperature measurement system is proposed, which utilizes three thermocouples with different wire diameters. Based on the Tikhonov regularization method, the mathematical model can be identified and the time constant can be calculated. For the cascade system with a consistent thermocouple wire diameter, an optimized regularization method with the singular value decomposition is proposed. The ill-conditioned estimation can be avoided, which is due to the collinearity of the thermocouple information matrix. In this way, the validity of the proposed method is extended effectively. It is verified by the numerical simulation in the perspective of theory. Experiments are implemented with a gas temperature dynamic calibration equipment. Compared with the total least square Tikhonov regularization algorithm and the least squares algorithm, experimental results show that the identification precision of the optimized regularization method of the time constant estimation with the singular value decomposition is improved 75% and 3.5 times at least. The validity of the proposed method is verified. © 2020, Science Press. All right reserved.

引用

页码：74 / 81

页数：7

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