Thermal Contact Analysis Using Identification Method

Abstract

The system identification method is one of the most important topics in engineering. An interesting application of this method is to investigate the heat transfer from the exhaust valve, especially the valve burning at high temperatures. This study consists of experimental and analytical work. During experimentation, two co-axial rods were used to transfer heat at their contact surfaces. Using the measured temperatures at different locations on the rods and the analytical method, the temperature distribution of the rods and the heat transfer coefficient of the contact surface were calculated. Using the above calculated temperatures at both sides of the contact surface and applying the system identification method, the temperature transfer function was estimated. Using the transfer function, a computational model was created. The results were compared to previous research work. An experimental apparatus, including an analog to digital board, was designed and set up for the experiment.

Applying artificial neural networks (ANN) to the estimation of thermal contact conductance in the exhaust valve of internal combustion engine

“…So far, a suitable model hasn't presented for predicting heat transfer coefficient, calculation heat transfer rate at the periodic contact and finally predicting temperature exhaust valve. Moreover use of electrical and control systems to improve engine performance requires estimation of parameters such as heat transfer rate between the exhaust valve and seat, contact heat transfer coefficient and valve temperature [9]. We need to provide an appropriate model for estimation such parameters to achieve this important goal.…”

Steady‐state estimation of thermal contact conductance between sliding disk and stationary cylinder with similar/dissimilar materials under the isothermally heated boundary condition

“…They have a much lower thermal conductivity compared with metallic contacting surfaces. So, there is a thermal contact resistance (TCR) [5][6][7][8][9][10][11][12][13][14][15] that is the inverse of the TCC. The TCR plays a key role when the safety and lifetime of a system should be secured with effective thermal management.…”