In this paper,a fault tolerant control with the consideration of actuator fault for a networked control system （NCS） with packet loss is addressed.The NCS with data packet loss can be described as a switched system ...In this paper,a fault tolerant control with the consideration of actuator fault for a networked control system （NCS） with packet loss is addressed.The NCS with data packet loss can be described as a switched system model.Packet loss dependent Lyapunov function is used and a fault tolerant controller is proposed respectively for arbitrary packet loss process and Markovian packet loss process.Considering a controlled plant with external energy-bounded disturbance,a robust H ∞ fault tolerant controller is designed for the NCS.These results are also expanded to the NCS with packet loss and networked-induced delay.Numerical examples are given to illustrate the effectiveness of the proposed design method.展开更多
专用短程通信(Dedicated Short Range Communication,DSRC)是车联网的主要技术之一,针对DSRC测试评价的需求,在封闭测试场环境下构建了多个典型车联网应用场景。制定了详细的测试方案,以丢包率(PacketLoss Rate,PLR)和时延(Delay,DE)为...专用短程通信(Dedicated Short Range Communication,DSRC)是车联网的主要技术之一,针对DSRC测试评价的需求,在封闭测试场环境下构建了多个典型车联网应用场景。制定了详细的测试方案,以丢包率(PacketLoss Rate,PLR)和时延(Delay,DE)为评价指标,测试分析了速度、距离、遮蔽物等因素对DSRC通信性能的影响。测试结果表明,通信距离和遮蔽物是造成DSRC通信性能下降的主要因素。展开更多
This paper is concerned with controller design of net- worked control systems （NCSs） with both network-induced delay and arbitrary packet dropout. By using a packet-loss-dependent Lyapunov function, sufficient condi...This paper is concerned with controller design of net- worked control systems （NCSs） with both network-induced delay and arbitrary packet dropout. By using a packet-loss-dependent Lyapunov function, sufficient conditions for state/output feedback stabilization and corresponding control laws are derived via a switched system approach. Different from the existing results, the proposed stabilizing controllers design is dependent on the packet loss occurring in the last two transmission intervals due to the network-induced delay. The cone complementary lineara- tion （CCL） methodology is used to solve the non-convex feasibility problem by formulating it into an optimization problem subject to linear matrix inequality （LMI） constraints. Numerical examples and simulations are worked out to demonstrate the effectiveness and validity of the proposed techniques.展开更多
针对目前IP电话语音质量难以准确评价及测量的情况,研究了一种基于E-Model的VoIP(voice over internet protocol)语音质量的测量模型。该模型考虑了IP网络中大多数的网络损伤因素,并能容易地计算出不同丢包率、不同的延迟和抖动所对应的...针对目前IP电话语音质量难以准确评价及测量的情况,研究了一种基于E-Model的VoIP(voice over internet protocol)语音质量的测量模型。该模型考虑了IP网络中大多数的网络损伤因素,并能容易地计算出不同丢包率、不同的延迟和抖动所对应的MOS(mean opinion score)值。测试出IP电话在网络中质量变化情况,有利于IP网络中资源的调整和VoIP质量的提高。展开更多
基金supported by National Natural Science Foundation of China (No. 60874052)
文摘In this paper,a fault tolerant control with the consideration of actuator fault for a networked control system （NCS） with packet loss is addressed.The NCS with data packet loss can be described as a switched system model.Packet loss dependent Lyapunov function is used and a fault tolerant controller is proposed respectively for arbitrary packet loss process and Markovian packet loss process.Considering a controlled plant with external energy-bounded disturbance,a robust H ∞ fault tolerant controller is designed for the NCS.These results are also expanded to the NCS with packet loss and networked-induced delay.Numerical examples are given to illustrate the effectiveness of the proposed design method.
文摘专用短程通信(Dedicated Short Range Communication,DSRC)是车联网的主要技术之一,针对DSRC测试评价的需求,在封闭测试场环境下构建了多个典型车联网应用场景。制定了详细的测试方案,以丢包率(PacketLoss Rate,PLR)和时延(Delay,DE)为评价指标,测试分析了速度、距离、遮蔽物等因素对DSRC通信性能的影响。测试结果表明,通信距离和遮蔽物是造成DSRC通信性能下降的主要因素。
基金supported by the National Natural Science Foundation of China (6093400761174059)+1 种基金the Program for New Century Excellent Talents (NCET-08-0359)the Shanghai RisingStar Tracking Program (11QH1401300)
文摘This paper is concerned with controller design of net- worked control systems （NCSs） with both network-induced delay and arbitrary packet dropout. By using a packet-loss-dependent Lyapunov function, sufficient conditions for state/output feedback stabilization and corresponding control laws are derived via a switched system approach. Different from the existing results, the proposed stabilizing controllers design is dependent on the packet loss occurring in the last two transmission intervals due to the network-induced delay. The cone complementary lineara- tion （CCL） methodology is used to solve the non-convex feasibility problem by formulating it into an optimization problem subject to linear matrix inequality （LMI） constraints. Numerical examples and simulations are worked out to demonstrate the effectiveness and validity of the proposed techniques.
文摘针对目前IP电话语音质量难以准确评价及测量的情况,研究了一种基于E-Model的VoIP(voice over internet protocol)语音质量的测量模型。该模型考虑了IP网络中大多数的网络损伤因素,并能容易地计算出不同丢包率、不同的延迟和抖动所对应的MOS(mean opinion score)值。测试出IP电话在网络中质量变化情况,有利于IP网络中资源的调整和VoIP质量的提高。
