This paper deals with control system design and implementation problems encountered in multiple robot systems. The methodology developed is depicted by a set of coordination mechanisms using hierarchical net structure...This paper deals with control system design and implementation problems encountered in multiple robot systems. The methodology developed is depicted by a set of coordination mechanisms using hierarchical net structures and their accompanying rules. With the net models, the hierarchical and distributed control system is designed for an assembly task. Synchronization commands allow coordination of the movements of the robots. The net models make concurrency of the movements of the robots transparent to users. The net based machine controller executes robot motion control through the communication with the external robot controller using the command/response concept. Sensory signals indicating the change of state of robots are used to trigger or initiate tasks. Simultaneous movement of the robots is obtained by creating different background threads running in parallel under Windows OS. The multilevel hierarchical control system can be consistently constructed using net models.展开更多
目前离散事件触发通信机制DETCS(Periodic time-triggered communication scheme)下NCS(Networked control system)理论研究结果的验证仍限于单机下的Matlab仿真,尚无真实网络环境的引入;而传统基于周期时间触发通信机制的NCS实验平台,...目前离散事件触发通信机制DETCS(Periodic time-triggered communication scheme)下NCS(Networked control system)理论研究结果的验证仍限于单机下的Matlab仿真,尚无真实网络环境的引入;而传统基于周期时间触发通信机制的NCS实验平台,又缺少受控制需求驱动事件触发条件的约束。针对此问题,开发了DETCS下的虚拟NCS实验平台。该平台以校园局域网为通信媒介,采用OPC通信协议,结合西门子S7-300PLC,首先实现了分离于2台PC机上的被控对象和控制器的通信;其次将离散事件触发条件引入被控对象输出端,借助Matlab OPC工具箱提供的OPC技术及软件组态方法实现了真实网络环境下基于DETCS的虚拟NCS平台的搭建。实验平台测试及结果分析表明,DETCS的引入兼顾了NCS的控制性能和网络资源的节约,所搭建的平台能够为DETCS下的NCS理论研究提供有效的工程可用性验证平台。展开更多
基于离散事件触发通讯机制,研究了在稀疏数据传输情形下非线性网络化控制系统(Nonlinear Networked Control System,NNCS)的满意容错控制问题。基于事件触发稀疏数据传输背景建立了带执行器饱和约束的闭环故障系统模型;利用提出的安全...基于离散事件触发通讯机制,研究了在稀疏数据传输情形下非线性网络化控制系统(Nonlinear Networked Control System,NNCS)的满意容错控制问题。基于事件触发稀疏数据传输背景建立了带执行器饱和约束的闭环故障系统模型;利用提出的安全度定义和Lyapunov稳定性理论,推证出使NNCS具有广义H_∞/H_2性能和α-安全度的容错收缩不变集充分条件和相应的协同设计方法;通过仿真算例验证了理论方法在协同设计方面的可行性和节约网络资源方面的有效性,并提出了实际应用中应遵循的折中类定性原则。展开更多
文摘This paper deals with control system design and implementation problems encountered in multiple robot systems. The methodology developed is depicted by a set of coordination mechanisms using hierarchical net structures and their accompanying rules. With the net models, the hierarchical and distributed control system is designed for an assembly task. Synchronization commands allow coordination of the movements of the robots. The net models make concurrency of the movements of the robots transparent to users. The net based machine controller executes robot motion control through the communication with the external robot controller using the command/response concept. Sensory signals indicating the change of state of robots are used to trigger or initiate tasks. Simultaneous movement of the robots is obtained by creating different background threads running in parallel under Windows OS. The multilevel hierarchical control system can be consistently constructed using net models.
文摘目前离散事件触发通信机制DETCS(Periodic time-triggered communication scheme)下NCS(Networked control system)理论研究结果的验证仍限于单机下的Matlab仿真,尚无真实网络环境的引入;而传统基于周期时间触发通信机制的NCS实验平台,又缺少受控制需求驱动事件触发条件的约束。针对此问题,开发了DETCS下的虚拟NCS实验平台。该平台以校园局域网为通信媒介,采用OPC通信协议,结合西门子S7-300PLC,首先实现了分离于2台PC机上的被控对象和控制器的通信;其次将离散事件触发条件引入被控对象输出端,借助Matlab OPC工具箱提供的OPC技术及软件组态方法实现了真实网络环境下基于DETCS的虚拟NCS平台的搭建。实验平台测试及结果分析表明,DETCS的引入兼顾了NCS的控制性能和网络资源的节约,所搭建的平台能够为DETCS下的NCS理论研究提供有效的工程可用性验证平台。
文摘基于离散事件触发通讯机制,研究了在稀疏数据传输情形下非线性网络化控制系统(Nonlinear Networked Control System,NNCS)的满意容错控制问题。基于事件触发稀疏数据传输背景建立了带执行器饱和约束的闭环故障系统模型;利用提出的安全度定义和Lyapunov稳定性理论,推证出使NNCS具有广义H_∞/H_2性能和α-安全度的容错收缩不变集充分条件和相应的协同设计方法;通过仿真算例验证了理论方法在协同设计方面的可行性和节约网络资源方面的有效性,并提出了实际应用中应遵循的折中类定性原则。
