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在网络带宽受限的网络控制系统中,设计了一个基于一维输入输出映射关系的模糊逻辑调节器,对控制系统的带宽进行动态管理。通过调整该模糊逻辑调节器中的非线性偏移因子可以进一步改善系统的控制性能和带宽需求。同时利用线性矩阵不等式及资源受限条件来确定带宽动态分配的上下界来保证系统的稳定性。另外,定义了多回路归一化控制质量和归一化带宽需求度性能衡量指标来评价网络控制系统的全局性能。在此评价方法下,提出的模糊带宽管理方法和采用固定带宽分配方法进行仿真比较。结果表明模糊带宽管理方法相对于固定带宽分配方法而言在提高系统控制性能的同时也节省了网络带宽。
In the network control system with limited network bandwidth, a fuzzy logic regulator based on one-dimensional input-output mapping is designed to dynamically manage the bandwidth of the control system. The system’s control performance and bandwidth requirements can be further improved by adjusting the nonlinear offset factor in the fuzzy logic regulator. At the same time, the upper and lower bounds of dynamic allocation of bandwidth are determined by using linear matrix inequalities and resource constrained conditions to ensure system stability. In addition, the multi-loop normalized control quality and normalized bandwidth demand-degree performance metrics are defined to evaluate the global performance of the network control system. Under this evaluation method, the proposed fuzzy bandwidth management method is compared with the fixed bandwidth allocation method. The results show that fuzzy bandwidth management method can save network bandwidth while improving system control performance compared with fixed bandwidth allocation method.