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Sliding mode methods have been historically studied because of their strong robustness properties with regard to a certain class of uncertainty, achieved by employing nonlinear control/injection signals to force the system trajectories to attain in finite time a motion along a surface in the state-space. This paper will consider how these ideas can be exploited for fault detection (specifically fault signal estimation) and subsequently fault tolerant control. It will also describe applications of these ideas to aerospace systems, including piloted flight simulator results associated with the GARTEUR AG16 Action Group on Fault Tolerant Control. The results demonstrate a successful real-time implementation of the proposed fault tolerant control scheme on a motion flight simulator configured to represent the post-failure EL-AL aircraft.
Content available remote Sterowanie ślizgowe - odporna metoda regulacji obiektów dynamicznych
Przedstawiony niżej tekst - w przystępny sposób - opisuje najważniejsze zagadnienia sterowania o zmiennej strukturze z ruchem ślizgowym. Przedstawia podstawowe pojęcia dotyczące tej problematyki, wskazuje istotne zalety omawianej metody regulacji oraz wzmiankuje najbardziej aktualne problemy badawcze w tym zakresie.
This paper presents - in a tutorial manner - principles of variable structure control systems with sliding modes. It presents basic notions relevant to the field of variable structure systems, shows principal advantages of the sliding mode control and makes an attempt to point out some current research trends in the field.
Content available remote High-gain feedback and sliding modes in infinite dimensional systems
This paper focuses on the connection between sliding motions and low frequency modes of high-gain feedback systems in an infinite dimensional framework. We study a particular class of abstract control systems in a Hilbert space setting and analyse their high-gain behaviour through singular perturbations. We show that the "slow" motion derived from the reduced model approximates the evolution of the closed loop after a fast transient. Moreover we prove a relation between this slow component of the high-gain feedback system and sliding motions, in the spirit, of the analogous result in the finite dimensional setting by Young, Kokotovic and Utkin (Young et al., 1977).
The strong demand for low emissions from spark ignition engines alongside the introduction of microcomputers in cars has increased the attention paid to fuel injection control. Initially, controllers were in feedforward configuration and look-up tables were employed. Later feedback configurations emerged. We use a combined approach. A feedforward controller is used based on simple equations and coarse approximations. A sliding mode feedback controller is added to achieve the desired performance. Nonlinear simulation results demonstrate the efficacy of the approach.
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