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The problem of sampled-data state reconstruction in linear time invariant systems is considered. A new full order observer structure that can generate intersample state estimation is introduced. The observer synthesis is carried out using the H∞ framework and is shown to have some important advantages over the classical lifting technique that has been used to study similar problems. A simulation example illustrates the application of the proposed design in the fast rate fault detection problem. [ABSTRACT FROM AUTHOR]

The objective of life-extending control (LEC), also known as damage-mitigating control, is to design a controller to achieve a good tradeoff between structural durability and dynamic performance in a system. This task involves both damage dynamics modelling and LEC design. The authors propose a new hierarchical LEC structure and apply it to a typical boiler system. There are two damage models in this structure: Model I is for on-line LEC, Model II is for on-line life prediction of the critical components of the system. Finally, an optimal LEC scheme is proposed and simulation results show that the designed LEC substantially reduces the accumulated damage with a minimum loss of dynamic performance. [ABSTRACT FROM AUTHOR]