非线性传热系统的自适应预测模型

Adaptive Prediction Model for Nonlinear Heat Transfer System

针对非线性传热系统,提出了一种估算温度的多模型自适应方案。首先,在系统的运行范围内,将非线性传热系统划分为若干个线性化子空间;其次,基于阶跃响应函数模型建立与各子空间对应的温度线性预测子模型;最后,根据各个预测子模型与实际传热系统的瞬时匹配程度,对预测子模型集进行加权综合,获得非线性传热系统的全局性预测模型。文中以移动热源传热系统为例验证了上述方案的有效性。

A multiple model adaptive scheme for the temperature estimation of nonlinear heat transfer system is proposed.Firstly,the nonlinear heat transfer system is divided into several linear subspaces within the operating range of the system.Secondly,based on the step response function model,a linear temperature prediction sub-model corresponding to each subspace is established.Finally,according to the instantaneous matching degree between each prediction sub-model and the actual heat transfer system,the prediction sub-models are weighted and synthesized,and the global prediction model of the nonlinear heat transfer system is obtained.The effectiveness of the scheme is verified by the heat transfer system with moving heat source.