scholarly journals DEVELOPMENT AND STUDY OF SOLUTION UNIT FOR AUTOMATED AEROPONICS GROWING PLANT

Author(s):  
R. R. Sharipov ◽  
G. V. Kotelnikov ◽  
I. V. Volko ◽  
A. M. Makarov

Research and development of a solution node of an automated plant for aeroponic growing have been considered. The paper describes the options for storing mother solutions, the methods for their dilution, automation of the Ph control process, the methods for selective assessment of the concentration of nutrients by NPK. A number of key problems that limit the full automation of solution nodes in a closed cycle of plant growing have been highlighted.

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Jian Liu ◽  
Xiaoli Li ◽  
Jihan Li ◽  
Kang Wang ◽  
Fuqiang Wang ◽  
...  

In limestone-gypsum wet flue gas desulfurization process, the change process of pH value of slurry in absorption tower is a typical nonlinear system with time delay and various uncertainties, so it is difficult to establish an accurate mathematical model of slurry pH control process. According to the pH control process of the slurry of wet flue gas desulfurization process, a model-free adaptive control algorithm based on compact form dynamic linearization (CFDL-MFAC) is designed to realize the tracking control of the pH value of the slurry. Due to various interference factors in the pH control process of slurry in absorption tower, it is easy to cause jump change of control system parameters and even structure. Therefore, a model-free adaptive control algorithm based on switching strategy is proposed in this paper. According to different working conditions, several model-free adaptive controllers are established. The stability of the algorithm is analyzed for the two cases of fixed system parameters and jumping system parameters. It was found that the model-free adaptive controller based on the switching strategy can switch multiple controllers under the condition of system parameter jump, so as to realize the fast tracking control of the slurry pH value of the system absorption tower under different working conditions. Through this method, the overshoot can be reduced and the control quality can be improved.


The basic features of closed cycle m.p.d. systems are described, introducing the three main combination cycles (direct nuclear, indirect nuclear, indirect fired) which could be adopted for commercialpower stations. Because of the high temperatures and attendant problems associated with thermal ionization of the working gas plasma, emphasis is placed upon achieving non-equilibrium ionization. This phenomenon is generally applicable only in closed cycle systems employing certain gases as the working fluid: the basic theory and required operating parameters of several techniques for inducing non-equilibrium ionization are reviewed. Matching a heat source, whether based on combustion or nuclear energy, to the m.p.d. stage imposes a number of restrictions. Nuclear reactors to provide temperatures suitable for m.p.d. systems (perhaps up to 1800 °G) have yet to be developed, but design criteria can be formulated. Cycle studies to specify operating parameters (including temperature, pressure, associated steam cycle, etc.) are presented. The technical feasibility of an indirect fired heat exchanger is considered. Over-all system performance, development time scale and incentives are also examined. In the United Kingdom, experimental research and development towards closed cycle m.p.d. power generation is mainly in progress at International Research and Development Co. Ltd and at A.E.R.E., Harwell. Details of the programmes are given and achievements in terms of experimental data are presented. Finally, the prospects for closed cycle m.p.d. power generation are reviewed.


2007 ◽  
Vol 44 (3) ◽  
pp. 309-316 ◽  
Author(s):  
Masahiko OSAKA ◽  
Hiroyuki SERIZAWA ◽  
Masato KATO ◽  
Kunihisa NAKAJIMA ◽  
Yoshiaki TACHI ◽  
...  

Electronics ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 763
Author(s):  
Héctor Serrano-Magaña ◽  
Apolinar González-Potes ◽  
Vrani Ibarra-Junquera ◽  
Patricia Balbastre ◽  
Diego Martínez-Castro ◽  
...  

Modern industries require constant adaptation to new trends. Thus, they seek greater flexibility and agility to cope with disruptions, as well as to solve needs or meet the demand for growth. Therefore, smart industrial applications require a lot of flexibility to be able to react more quickly to continuous market changes, offer more personalized products, increase operational efficiency, and achieve optimum operating points that integrate the entire value chain of a process. This requires the capture of new data that are subsequently processed at different levels of the hierarchy of automation processes, with requirements and technologies according to each level. The result is a new challenge related to the addition of new functionalities in the processes and the interoperability between them. This paper proposes a distributed computational component-based framework that integrates communication, computation, and storage resources and real-time capabilities through container technology, microservices, and the publish/subscribe paradigm, as well as contributing to the development and implementation of industrial automation applications by bridging the gap between generic architectures and physical realizations. The main idea is to enable plug-and-play software components, from predefined components with their interrelationships, to achieve industrial applications without losing or degrading the robustness from previous developments. This paper presents the process of design and implementation with the proposed framework through the implementation of a complex pH control process, ranging from the simulation part to its scaling and implementation to an industrial level, showing the plug-and-play assembly from a definition of components with their relationships to the implementation process with the respective technologies involved. The effectiveness of the proposed framework was experimentally verified in a real production process, showing that the results scaled to an industrial scale comply with the simulated design process. A qualitative comparison with traditional industrial implementations, based on the implementation requirements, was carried out. The implementation was developed in the beverage production plant “Punta Delicia”, located in Colima, Mexico. Finally, the results showed that the platform provided a high-fidelity design, analysis, and testing environment for cyber information flow and their effect on the physical operation of the pH control.


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