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This paper reports a robust sensing method using nonlinear micromechanical resonators for applications such as resonant mass and thermal radiation sensors. Resonators show stochastic response by applying noise, in which resonators show two vibration states, i.e. large vibration amplitude state and small vibration amplitude state. Single resonator acts as a bistable element, and from responses of the...
This paper compares estimation performance of two optimal disturbance observers which estimate more than one unknown and unmeasurable disturbances acting on a linear time-invariant system. Both observers are designed in O'Reilly's framework, but they are constructed in a slightly different manner. The one is constructed so that maximum estimation errors are minimized in the sense of Pareto optimality...
A frequency-domain characterization of the solution to a modified LQ problem, which have been formulated and solved by the present authors, is discussed. In the modified LQ problem the optimal state feedback law is supposed to be determined in terms of minimum covariance matrix of the state vector. Without costing the control power, the problem is made well-posed by assuming state observation noise...
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