基于表面测温的复杂模型传热边界条件识别

Identification of Complex Model Thermal Boundary Conditions Based on Exterior Temperature Measurement

将有限元分析软件求解复杂模型温度场的优势与多元函数优化算法寻优的优势相结合,提出一种基于表面测点反演求解三维复杂模型稳态温度场时所需的传热边界条件的可行性方案,即只需要若干点温度实测值便可实现多个边界条件的同时反演。以某高功率密度柴油机气缸盖底面对流换热系数识别为例,根据本文的方法得到以下计算结果:当温度测量误差小于0.5℃时,计算得到的边界条件值最大相对误差不超过2%。该结果验证了本方法的可行性。

Combining the advantages of the finite element software in temperature field analyzing with the multivariate function optimization arithmetic, a feasibility method based on the exterior temperature was proposed to get the thermal boundary conditions, which was required in temperature field analyzing. Thethermal boundary conditions can be obtained only by some temperature measurement values. Taking the identification of the convection heat transfer coefficient of a high power density diesel engine cylinder head as an example, the calculation result shows that when the temperature measurement error was less than 0.5＊C, the maximum relative error was less than 2% It is shnwn that the new met.hnd was feasible