scholarly journals B-Plant Canyon Ventilation Control System Description

1999 ◽  
Author(s):  
K.S. MCDANIEL
Keyword(s):  
Control System ◽  
Ventilation Control ◽  
System Description

scholarly journals Model Predictive Control via Output Feedback Neural Network for Improved Multi-Window Greenhouse Ventilation Control

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1756
Author(s):  
Dae-Hyun Jung ◽  
Hak-Jin Kim ◽  
Joon Yong Kim ◽  
Taek Sung Lee ◽  
Soo Hyun Park
Keyword(s):  
Neural Network ◽  
Control System ◽  
Output Feedback ◽  
Optimization Method ◽  
Control Logic ◽  
Ventilation Control ◽  
Window Opening ◽  
Accurate Performance ◽  
Feedback Neural Network ◽  
Comparison Of The Results

Maintaining environmental conditions for proper plant growth in greenhouses requires managing a variety of factors; ventilation is particularly important because inside temperatures can rise rapidly in warm climates. The structure of the window installed in a greenhouse is very diverse, and it is difficult to identify the characteristics that affect the temperature inside the greenhouse when multiple windows are driven, respectively. In this study, a new ventilation control logic using an output feedback neural-network (OFNN) prediction and optimization method was developed, and this approach was tested in multi-window greenhouses used for strawberry production. The developed prediction model used 15 inputs and achieved a highly accurate performance (R2 of 0.94). In addition, the method using an algorithm based on an OFNN was proposed for optimizing considered six window-opening behavior. Three case studies confirmed the optimization performance of OFNN in the nonlinear model and verified the performance through simulations. Finally, a control system based on this logic was used in a field experiment for six days by comparing two greenhouses driven by conventional control logic and the developed control logic; a comparison of the results showed RMSEs of 3.01 °C and 2.45 °C, respectively. It confirmed the improved control performance in comparison to a conventional ventilation control system.

Control system description and performance of a phased array telescope

1990 ◽  
Author(s):  
Charles A. Tipton ◽  
Joseph A. Meinhardt ◽  
Mohammad Jamshidi
Keyword(s):  
Control System ◽  
Phased Array ◽  
System Description ◽  
And Performance
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