Assessing Validity of the Dead Zone Model to Characterize Transport of Contaminants in the River Wkra

2011 ◽  
pp. 235-245 ◽  
Author(s):  
Magdalena M. Mrokowska ◽  
Marzena Osuch
Keyword(s):  
Dead Zone ◽  
Zone Model ◽  
The Dead

Improved Pole-placement Control with Feed-forward Dead Zone Compensation for Position Tracking of Electro-Pneumatic Actuator System Improved Pole-placement Control with Feed-forward Dead Zone Compensation for Position Tracking of Electro-Pneumatic Actuato

2021 ◽  
Vol 20 (2) ◽  
pp. 25-32
Author(s):  
Noorhazirah Sunar ◽  
Mohd Fua’ad Rahmat ◽  
Ahmad ‘Athif Mohd Fauzi ◽  
Zool Hilmi Ismail ◽  
Siti Marhanis Osman ◽  
...  
Keyword(s):  
Dead Zone ◽  
Pneumatic Actuator ◽  
Pole Placement ◽  
Position Tracking ◽  
Zone Model ◽  
Feed Forward ◽  
The Dead ◽  
Chattering Effect ◽  
Pole Placement Controller ◽  
Pole Placement Control

Dead-zone in the valve degraded the performances of the Electro-Pneumatic Actuator (EPA) system.  It makes the system difficult to control, become unstable and leads to chattering effect nearest desired position.  In order to cater this issue, the EPA system transfer function and the dead-zone model is identified by MATLAB SI toolbox and the Particle Swarm Optimization (PSO) algorithm respectively.  Then a parametric control is designed based on pole-placement approach and combine with feed-forward inverse dead-zone compensation.  To reduce chattering effect, a smooth parameter is added to the controller output.  The advantages of using these techniques are the chattering effect and the dead-zone of the EPA system is reduced.  Moreover, the feed-forward system improves the transient performance.  The results are compared with the pole-placement control (1) without compensator and (2) with conventional dead-zone compensator.  Based on the experimental results, the proposed controller reduced the chattering effect due to the controller output of conventional dead-zone compensation, 90% of the pole-placement controller steady-state error and 30% and 40% of the pole-placement controller with conventional dead-zone compensation settling time and rise time.

Experimental and numerical validation of the dead-zone model for longitudinal dispersion in rivers

1998 ◽  
Vol 36 (2) ◽  
pp. 269-280 ◽  
Author(s):  
Wlodzimierz Czernuszenko ◽  
Pawel-M. RowiŃSki ◽  
Alexander Sukhodolov
Keyword(s):  
Dead Zone ◽  
Longitudinal Dispersion ◽  
Zone Model ◽  
Numerical Validation ◽  
The Dead

Adaptive interval type-2 fuzzy dynamic surface control for uncertain nonlinear systems with unknown asymmetric dead-zone input

2018 ◽  
Vol 41 (2) ◽  
pp. 516-531 ◽  
Author(s):  
Maryam Shahriari-kahkeshi ◽  
Sanaz Rahmani
Keyword(s):  
Fuzzy System ◽  
Dead Zone ◽  
Dynamic Surface Control ◽  
Zone Model ◽  
Uncertain Nonlinear Systems ◽  
Dynamic Surface ◽  
Surface Control ◽  
The Dead ◽  
Interval Type

In this study, an adaptive dynamic surface control (DSC) scheme based on the interval type-2 fuzzy systems is proposed for uncertain nonlinear systems with unknown asymmetric dead-zone input and unknown control gains. The dead-zone nonlinearity is represented as a time-varying system with a bounded disturbance. The proposed approach invokes the interval type-2 fuzzy system to approximate the unknown nonlinear dynamics that appears in the virtual and actual control inputs. Also, it proposes adaptive terms to compensate the effect of the disturbance-like term in the dead-zone constraint. Then, the DSC scheme is designed based on the interval type-2 fuzzy system and the dead-zone model. Adaptive laws are derived to tune the consequent parameters of the interval type-2 fuzzy system and the dead-zone model. Stability analysis of the proposed scheme shows that all the signals of the closed-loop system are uniformly ultimately bounded and the tacking error can be made arbitrary small by proper selection of the design parameters. The proposed scheme avoids the “explosion of complexity” and “singularity” problems, simultaneously. Furthermore, it can compensate the effect of the dead-zone constraint without any need to its parameters. The simulation and comparison results are presented to demonstrate the effectiveness of the proposed control scheme.

Properties of the dead-zone model of longitudinal dispersion in rivers

1997 ◽  
Vol 35 (4) ◽  
pp. 491-504 ◽  
Author(s):  
W. Czernuszenko ◽  
P.M. Rowinski
Keyword(s):  
Dead Zone ◽  
Longitudinal Dispersion ◽  
Zone Model ◽  
The Dead

scholarly journals SHEAR-DRIVEN FLUSHING OF MICRO-TIDAL MARINAS

2012 ◽  
Vol 1 (33) ◽  
pp. 59 ◽  
Author(s):  
Enda Murphy ◽  
Mathieu Deiber ◽  
Sylvain Perrin
Keyword(s):  
Water Exchange ◽  
Dead Zone ◽  
Mixing Layer ◽  
Practical Implementation ◽  
Zone Model ◽  
Hydrodynamic Models ◽  
Water Renewal ◽  
Coastal Basins ◽  
The Dead ◽  
Peripheral Areas

Flushing or residence times are typically used as a first step in assessing water quality in marinas, harbours and coastal basins. Recent publications have offered guidance in relation to optimal marina basin and entrance geometries to help achieve rapid renewal. However, these guidelines have been developed for the particular case where water exchange is strongly tide-driven and are not widely applicable, particularly in micro-tidal regions. Where water renewal rates are dominated by shear-driven circulation and lateral transfer of momentum at the interface between the marina and the adjacent water body (i.e. a mixing layer), there is a strong analogy to groyne fields and other cases involving flows containing quasi-stagnant peripheral areas (dead zones). A series of numerical hydrodynamic models, developed in the TELEMAC system, were used to investigate the potential for the dead zone model of water exchange to provide a better means to guide optimization of basin and entrance geometry under such conditions. Real-world marina case studies were used to identify any constraints affecting the practical implementation of such an approach. The numerical model results demonstrate particular conditions under which the dead zone model of water exchange can be used effectively to optimize marina basin and entrance geometry.

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