3,664 research outputs found
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Ireland in the atlantic world: Migration and cultural Transfer
This volume offers fresh perspectives on the political, military, religious, social, cultural, intellectual, economic, and environmental history of early modern Ireland and situates these discussions in global and comparative contexts
MIMO nonlinear PID predictive controller
A class of nonlinear generalised predictive controllers (NGPC) is derived for multi-input multi-output (MIMO) nonlinear systems with offset or steady-state response error. The MIMO composite controller consists of an optimal NGPC and a nonlinear disturbance observer. The design of the nonlinear disturbance observer to estimate the offset is particularly simple, as is the associated proof of overall nonlinear closed-loop system stability. Moreover, the transient error response of the disturbance observer can be arbitrarily specified by simple design parameters. Very satisfactory performance of the proposed MIMO nonlinear predictive controller is demonstrated for a three-link nonlinear robotic manipulator example
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Southern California Beach Processes Study - Torrey Pines Beach Nourishment Study 3rd Quarterly Report to California Resources Agency and California Department of Boating and Waterways
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Southern California Beach Processes Study - Torrey Pines Beach Nourishment Study 7th Quarterly Report
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Seasonal predictability of the winter North Atlantic Oscillation from a jet stream perspective
The winter North Atlantic Oscillation (NAO) has varied on interannual and decadal
timescales over the last century, associated with variations in the speed and latitude of the eddy-driven jet
stream. This paper uses hindcasts from two operational seasonal forecast systems (the European Centre for
Medium-range Weather Forecasts's seasonal forecast system, and the U.K. Met Office global seasonal
forecast system) and a century-long atmosphere-only experiment (using the European Centre for
Medium-range Weather Forecasts's Integrated Forecasting System model) to relate seasonal prediction
skill in the NAO to these aspects of jet variability. This shows that the NAO skill realized so far arises from
interannual variations in the jet, largely associated with its latitude rather than speed. There likely remains
further potential for predictability on longer, decadal timescales. In the small sample of models analyzed
here, improved representation of the structure of jet variability does not translate to enhanced seasonal
forecast skill
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