Research on temperature uniformity of SiC heating by multi microwave source combination based on topology reconstruction

In response to the problem of uneven temperature distribution caused by the formation of cold and hot spots during microwave heating, this paper proposes a variable power heating strategy for multi microwave source groups under topology reconstruction. Firstly, based on algebraic graph theory, a communication topology structure between microwave source agents is constructed, and a control framework for multi-agent systems under topology reconstruction is designed. Secondly, based on this framework, an event-triggered topology reconstruction algorithm is introduced to achieve consistency transformation of the microwave source communication topology structure, and to reconstruct the connection methods between different groups and coordinate the adjustment of the input power values. Finally, a numerical calculation model combining integer and continuous variables was established using the finite element method, and validated by heating SiC medium and a general heating model. Compared with the traditional universal heating model, the temperature uniformity index of the proposed strategy is improved by 12.2% -33.0% in the horizontal direction and 30.0% -53.9% in the vertical direction, proving that the proposed method can effectively improve the uniformity of temperature distribution.针对微波加热过程中因冷热斑点形成导致的温度分布不均问题，本文针对拓扑重构下的多微波源群组提出了变功率加热策略。首先，基于代数图论（algebraic graph theory），构建微波源智能体（microwave source agents）间的通信拓扑结构，并设计了拓扑重构下的多智能体系统（multi-agent systems）控制框架。其次，基于该框架引入事件触发拓扑重构算法，实现微波源通信拓扑结构的一致性变换，重构不同群组间的连接方式并协同调整输入功率值。最后，采用有限元法（finite element method）建立了融合整数与连续变量的数值计算模型，并通过碳化硅（SiC）介质加热实验与通用加热模型开展验证。与传统通用加热模型相比，本文所提策略的温度均匀性指标在水平方向提升了12.2%~33.0%，垂直方向提升了30.0%~53.9%，证明所提方法可有效改善温度分布的均匀性。