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计算机工程 ›› 2009, Vol. 35 ›› Issue (19): 129-131,. doi: 10.3969/j.issn.1000-3428.2009.19.043

• 网络与通信 • 上一篇    下一篇

基于等分采样的网络控制系统鲁棒故障检测

张 捷,薄煜明   

  1. (南京理工大学自动化学院,南京 210094)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-10-05 发布日期:2009-10-05

Robust Fault Detection of Network Control System Based on Equally Divided Sampling

ZHANG Jie, BO Yu-ming   

  1. (Institute of Automation, Nanjing University of Science and Technology, Nanjing 210094)
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-10-05 Published:2009-10-05

摘要: 考虑一类具有未知干扰的时延网络控制系统,对其进行故障检测。通过提高控制器端的采样频率,等分传感器采样周期,将网络时延近似看成控制器端采样周期的整数倍。建立基于离散切换系统的鲁棒H∞故障观测器,将观测器稳定条件归结为一个线性矩阵不等式。通过求解具有线性矩阵不等式约束的最小化问题,对故障检测阈值进行选取,从而增强检测的鲁棒性和灵敏度。仿真示例验证了该方法的有效性。

关键词: 网络控制系统, 故障检测, 鲁棒性, 故障观测器

Abstract: Considering a class of networked control systems with time delays and unknown interferences, the fault detection is carried out when the output delays are present. By increasing sampling frequency in controller and equally dividing the sampling period of the sensor, the time delays can be approximate to several times the sampling frequence of the controller. On this basis, the robust H∞ fault observer is constructed based on discrete switching systems, and a linear matrix inquality gives the stability condition of this observer. The fault detection threshold is selected with solving the minimization problem involving a linear matrix inequality constraint. In this way, the robustness and sensitivity of fault detection is enhanced. An illustrative example is given to demonstrate the effectiveness of the proposed method.

Key words: network control system, fault detection, robustness, fault observer

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