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control-oriented-models
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Control oriented modeling of a radial turbine for a turbocharged gasoline engine
, Article Proceedings of the American Control Conference ; Article number 6580648 , 2013 , Pages 5207-5212 ; ISSN: 07431619 ; ISBN: 9781479901777 ; Shahbakhti, M ; Alasty, A ; Vossoughi, G. R ; Sharif University of Technology
Abstract
This paper presents a control oriented model for predicting turbine major variables in a turbocharged spark ignition engine. The turbine is simulated as a two-nozzle chamber where the pressure ratio over the two nozzles is not the same. A convex nonlinear estimation algorithm is formulated to determine the relation between these pressure ratios. The new model is experimentally validated with transient and steady state data collected from a 1.7 liter gasoline engine. The results show the new model can predict the turbine mass flow with an average error of 1.4%. In addition, the application of the turbine model is illustrated for the design of a nonlinear observer to estimate the turbocharger...
A study on vertical motions of high-speed planing boats with automatically controlled stern interceptors in calm water and head waves
, Article Ships and Offshore Structures ; Volume 10, Issue 3 , 2015 , Pages 335-348 ; 17445302 (ISSN) ; Seif, M. S ; Abbaspoor, M ; Sharif University of Technology
Abstract
The controllable flaps and interceptors in planing crafts not only may reduce the resistance, but also could be designed to make a boat run at or near optimum attitude in various environments, which results in a reduction in both resistance and vertical motion in waves. Planing vessels suffer from porpoising instability and violent vertical motion at high forward speeds. The controllable flaps and interceptors can be used to control and reduce the vertical motion of planing crafts. In the present study, the impact of controlled interceptors on a planing craft seakeeping quality is investigated through application of experimental and theoretical methods. In the experimental part of the study,...