scholarly journals Model Identification and Control of Evapotranspiration for Irrigation Water Optimization

2022 ◽  
Vol 70 (1) ◽  
pp. 1749-1767
Author(s):  
Wafa Difallah ◽  
Fateh Bounaama ◽  
Belkacem Draoui ◽  
Khelifa Benahmed ◽  
Abdelkader Laaboudi
Keyword(s):  
Irrigation Water ◽  
Model Identification ◽  
And Control

Model identification and control of solution crystallization processes: a review

1993 ◽  
Vol 32 (7) ◽  
pp. 1275-1296 ◽  
Author(s):  
James B. Rawlings ◽  
Stephen M. Miller ◽  
Walter R. Witkowski
Keyword(s):  
Model Identification ◽  
Solution Crystallization ◽  
And Control

Model Identification and Operating Load Characterization for a Small Horizontal Axis Wind Turbine Rotor Using Integrated Blade Sensors

2010 ◽  
Author(s):  
Scott Dana ◽  
Joseph Yutzy ◽  
Douglas E. Adams
Keyword(s):  
Dynamic Response ◽  
Wind Turbine ◽  
Rotor Blade ◽  
Model Identification ◽  
Turbine Rotor ◽  
Forced Response ◽  
Horizontal Axis ◽  
Horizontal Axis Wind Turbine ◽  
And Control ◽  
Wind Turbine Rotor

One of the primary challenges in diagnostic health monitoring and control of wind turbines is compensating for the variable nature of wind loads. Given the sometimes large variations in wind speed, direction, and other operational variables (like wind shear), this paper proposes a data-driven, online rotor model identification approach. A 2 m diameter horizontal axis wind turbine rotor is first tested using experimental modal analysis techniques. Through the use of the Complex Mode Indication Function, the dominant natural frequencies and mode shapes of dynamic response of the rotor are estimated (including repeated and pseudo-repeated roots). The free dynamic response properties of the stationary rotor are compared to the forced response of the operational rotor while it is being subjected to wind and rotordynamic loads. It is demonstrated that both narrowband (rotordynamic) and broadband (wind driven) responses are amplified near resonant frequencies of the rotor. Blade loads in the flap direction of the rotor are also estimated through matrix inversion for a simulated set of rotor blade input forces and for the operational loading state of the wind turbine in a steady state condition. The analytical estimates are shown to be accurate at frequencies for which the ordinary coherence functions are near unity. The loads in operation are shown to be largest at points mid-way along the span of the blade and on one of the three blades suggesting this method could be used for usage monitoring. Based on these results, it is proposed that a measurement of upstream wind velocity will provide enhanced models for diagnostics and control by providing a leading indicator of disturbances in the loads.

Model Identification and Control Design Kit

1994 ◽  
Vol 27 (8) ◽  
pp. 1617
Author(s):  
S. Carabelli ◽  
C. Greco
Keyword(s):  
Model Identification ◽  
Control Design ◽  
And Control

scholarly journals DESENVOLVIMENTO DE OBSTRUÇÕES EM GOTEJADORES E EFICIÊNCIA DO CONTROLE USANDO DOIS TIPOS DE ÁCIDOS

Irriga ◽  
2007 ◽  
Vol 12 (2) ◽  
pp. 185-191
Author(s):  
Manoel Januário da Silva Júnior ◽  
José Francismar de Medeiros
Keyword(s):  
Water Quality ◽  
Hydrochloric Acid ◽  
Irrigation Water ◽  
Drip Irrigation ◽  
Variation Coefficient ◽  
Irrigation Water Quality ◽  
Randomized Design ◽  
Before And After ◽  
Completely Randomized Design ◽  
And Control

desenvolvimento de obstruçõesEM GOTEJADORES e eficiÊnciado controle usando dois tipos de ácidos  Manoel Januário da Silva Júnior1; José Francismar de Medeiros21Departamento de Engenharia Rural, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba, SP,  [email protected] de Ciências Ambientais, Universidade Federal Rural Do Semi-Árido,  Mossoró, RN  1 RESUMO Em irrigação localizada a qualidade da água é fundamental para o desempenho dos emissores. Uma conseqüência é a obstrução que reduz a uniformidade de emissão. Assim, os objetivos deste trabalho foram estudar o efeito da qualidade da água sobre o desenvolvimento de obstruções, bem como testar a eficiência de dois tipos de ácidos no controle dessas obstruções. O experimento foi instalado no delineamento inteiramente aleatorizado, no esquema fatorial 4x2 com duas repetições. Os tratamentos foram quatro tipos de água e dois ácidos (nítrico e clorídrico). Foi feita uma avaliação do sistema antes e outra após a acidificação. Para cada tratamento foram calculados a vazão, o coeficiente de variação de fabricação e a uniformidade de emissão. A qualidade da água de irrigação não influenciou a vazão, o coeficiente de variação de fabricação e a uniformidade de emissão. O uso de ácido nítrico e clorídrico foi eficiente no controle de obstruções. O uso do ácido clorídrico fica limitado a águas com menores teores de bicarbonatos. UNITERMOS: Gotejamento, qualidade de água, uniformidade de emissão, acidificação  SILVA JÚNIOR, M. J. da; MEDEIROS, J. F. de. DEVELOPMENT OF DRIPPER CLOGGING AND CONTROL EFFICIENCY USING TWO TYPES OF ACIDS  2 ABSTRACT In drip irrigation water quality is fundamental for emitter performance. Clogging is a consequence that reduces emission uniformity. Thus, this paper aimed to study water quality effect on the development of clogging and efficiency of acid types in clogging control. The experiment was installed in a completely randomized design with a 4x2 factorial scheme and two replications. The treatments were four types of water and two acids (nitric and hydrochloric). System evaluations were made before and after the acidification. For each treatment the following were calculated:  flow, manufacturer’s variation coefficient and emission uniformity. Water quality did not affect flow, manufacturer’s variation coefficient and emission uniformity. The use of nitric and hydrochloric acids was efficiency on clogging control. The use of hydrochloric acid is limited to waters with low bicarbonate levels. KEYWORDS: Drip irrigation, water quality, emission uniformity, acidification

scholarly journals Gender and the Commons

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Ranjini Murali ◽  
Ajay Bijoor ◽  
Charudutt Mishra
Keyword(s):  
Irrigation Water ◽  
Social Structures ◽  
Common Pool Resource ◽  
Control Rights ◽  
Gender Group ◽  
Resource Governance ◽  
The Commons ◽  
Role Of Women ◽  
And Control

Studies on common pool resource governance have largely focused on men, who tend to have disproportionate rights and ownership with regards property and resources. This has resulted in the access and control rights of women being generally overlooked. Gender disaggregated analyses have revealed the important role of women in the governance of the commons. While certain commons may be relatively more important for women, there are variations in their level of resource access and management role, influenced by social structures and divisions. We examined the role of gender and how such intersectionality could shape the governance of the commons in the Spiti Valley in the Indian Trans-Himalaya. We found that gender, class, and caste intersected in the governance of irrigation water. Our study highlights the role of women in the governance of the commons and points to the nuanced and variable roles found within this gender group.

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