Guo Zhong Wang

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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,(More)
Artificial ground freezing (AGF) method has been widely used in various kinds of municipal engineering projects. But existing formulas for calculation of the temperature field of artificially frozen soil walls are limited because they are all based on the conditions of the plane. Analytical solution of three-dimensional steady state temperature field of(More)
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