基于网络的切换系统采样数据控制与事件触发控制

In recent years, with the development and application of network, networked control system design has become a research hot topic. Sampled-data control and event-triggered control problems of networked switched systems (NSSs) are investigated in this project. For sampled-data control problems, sampled-data control models with variable sampling intervals and multi-rate sampling periods are established respectively. The new models can be used to deal with network- induced delay, packet dropouts and disorder. By considering switching features and characteristics of network, network-based asynchronous sampled-data controllers and time-driven switching signals are designed. The impacts of switching and network on system performance are analyzed, and the relations among sampling period, network-induced delay, packet dropouts and switching signals are studied as well. For event-triggered control problems, a novel mode-dependent integral event-triggering condition is proposed, which can be used to improve the disadvantages of existing conditions. Based on this new event-triggering condition, a new event-triggered control system model is constructed, which can be utilized to deal with network-induced delay and packet dropouts. Moreover, this model can also be used to tackle the issue of packet disorder which cannot be addressed by using input-delay approach. The relations among event-triggering condition, switching rules and system performance are investigated. Finally, simulations are provided to illustrate the validity and correctness of the results obtained in this project, and a unified framework is formed to deal with the issues of sampled-data control and event-triggered control problems of NSSs.

近年来，随着网络的发展与应用，基于网络的控制系统设计已成为研究的热点。本项目针对网络切换系统，研究采样数据控制和事件触发控制问题。针对切换系统采样数据控制问题，分别建立变周期采样和多频率采样数据控制模型，新模型能够同时处理网络时延、数据包丢失和乱序问题。考虑切换的本质和网络的特性，设计基于网络的异步采样数据控制器和基于时间驱动的切换信号，深入分析切换和网络对系统性能的影响，以及采样周期、网络时延、丢包和切换信号之间的关系。针对切换系统事件触发控制问题，设计新的模态依赖积分型事件触发条件，改进现有事件触发条件的不足。在此基础上，建立新的事件触发控制模型，该模型不但能够处理网络时延和丢包，还能处理输入时滞法模型不能处理的数据包乱序的情况。深入分析事件触发条件、切换规则以及系统性能之间的关系。最后，通过仿真验证所得结果的正确性和有效性，形成完整的网络切换系统采样数据控制和事件触发控制理论体系。

本项目针对存在网络连接的切换系统，研究其相关控制问题。主要包括采样控制和事件触发控制，同时考虑了网络中存在的丢包、时延、量化等问题。由于网络丢包、时延的存在，可能会导致控制器和系统模态的不匹配，因此分别研究了同步切换和异步切换控制问题。此外，还考虑了采用无线网络的通讯问题。由于无线网络的存在，使得系统易于受到恶意的攻击，因此研究了相关的攻防关键问题，主要包括最优攻击设计、攻击检测器设计和安全控制器设计。最后，通过无人机的实例验证了理论的正确性和可行性。