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This paper studies fault detection problem of linear continuous-time periodic systems. At first, an optimal periodic observer-based residual generator is derived for the case of no model uncertainty, which achieves the best compromise between the sensitivity to faults and the robustness to unknown disturbances. Then, in order to deal with model uncertainty, a post-filter is introduced which provides...
In this paper, problems related to the design of fault detection filters (FDF) for dynamic systems with unknown inputs are studied. Core of our study is to consider the design problems under two different residual evaluation functions, the i?2-norm and the peak amplitude of the residual signals. The background of this study is the fault detection strategy of using multi-residual evaluation functions,...
The fault detection problems of multirate-output sampled-data (MROSD) systems and MROSD systems with time delays are investigated. The main advantage of the approaches presented in this paper is that they can take into consideration the intersample behavior of such systems. The basic idea is to observe the dynamics of the system at fast sampling instants and then downsample the discrete-time outputs...
This paper presents a novel energy-based watermarking scheme (EBW). The aim of EBW is to make the watermark survive video compression and collusion. After carefully analyzing the effect of the video compression on different type regions of video, two properties of the video coding are explored. According to these two properties, the watermark is deliberately embedded into the video to improve the...
Parity space approach and H2 approach are two important fault detection approaches. This paper studies the relationship between these two approaches, which reveals frequency domain characteristics of the optimal solution of the parity space approach on the one side and provides a numerical solution of the H2-optimal design of residual generators on the other side.
This paper deals with fault detection problems in sampled-data (SD) systems. A tool is first introduced for the analysis of intersample behavior of SD systems in the frequency domain from the viewpoint of fault detection and isolation. Based on it, a direct design approach of fault detection systems for SD systems is proposed, and further the problem of full decoupling from unknown disturbances is...
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