KEYWORDS: Data modeling, Temperature metrology, Signal processing, Thermal modeling, Infrared radiation, Error analysis, Covariance, Control systems, Thermography, Temperature sensors
Aiming at the problem that excessive temperature of brake disc may cause traffic accidents due to thermal decay, thermocouples are used to measure the instantaneous temperature of vehicle brake during braking, and the accurate instantaneous temperature after interference is obtained through analysis and processing. The heating model and cooling model are established based on the heat conduction principle with friction instantaneous temperature as the parameter, and the final brake temperature monitoring model is obtained. By bench test, the maximum relative error between the predicted result and the test data is 9.3%, which shows that the model is accurate and feasible.
Precision ceramic bonded structural parts have an irreplaceable position in the aerospace business and are widely used in various industries due to their various advantages, but at the same time, the uneven thickness of the adhesive layer will affect the quality of ceramic adhesive structural par. In this paper, terahertz time-domain spectroscopy is used for nondestructive detection of the adhesive layer inside the sample, and the thickness information is reconstructed from the experimental data using an autoregressive spectral extrapolation method based on improved covariance, and the difference in the time of flight of the echoes on the upper and lower surfaces of the adhesive layer is used to find the thickness of the adhesive layer. This paper analyzes the thickness of the adhesive layer of 0.5mm and 1mm respectively, and finally gets the error rate of 7.2% and 6.3%. This error rate is basically in line with the quality of the product and provides reliable technical support for the aerospace business.
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