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fuzzy Modeling Vapor Pressure Deficit to Monitoring Microclimate in Greenhouses

IFAC-PapersOnLine 2016年第16期49卷 371-374页

作者： Ramos-Fernández, Julio César Balmat, Jean-François Márquez-Vera, Marco Antonio Lafont, Frédéric Pessel, Nathalie Espinoza-Quesada, Eduardo Steed Universidad Politécnica de Pachuca Carr. Pachuca - Cd. Sahagún Km 20 Rancho Luna Ex-Hacienda de Santa Barbara ZempoalaHgo.43830 Mexico Aix Marseille Université Université de Toulon CS 60584 CNRS ENSAM LSIS UMR 7296 Toulon Cedex 9 83041 France

Instrumentation to measure microclimate in greenhouses is a task to developing before starting the identification and control moisture and temperature in greenhouses, a variable which best describe the microclimate and helps prevent fungus and disease risks, is the vapor pressure deficit (VPD), it is measured indirectly by means of two inputs: temperature and humidity, by means the psychrometric chart, and another way is using interpolation models. This paper shows methodology to measure VPD, by using fuzzy modeling type Takagi-Sugeno (T-S). fuzzy modeling is based on expert and human knowledge, additionally this is combined with mathematical techniques to identify parameters of the antecedents and consequents of IF-THEN fuzzy rules, each IF-THEN fuzzy rule defines a submodel or region of interpolation. In this work, expert knowledge is the information described in psychrometric chart. Modeling learning was performed using air temperature and relative humidity, a set of 8 fuzzy rules was proposed to interpolate the VPD. The results of the fuzzy model are illustrated using measurements of an experimental greenhouse, and was contrasted with a model well known in the literature. The algorithm of fuzzy modelling VPD, was codified in two platform application real time: C to microcontroller and LabVIEWTM, thus it is possible measuring the instantaneous VPD. © 2016

关键词： fuzzy inference Disease control fuzzy rules Greenhouses Humidity control Hydrostatic pressure Interpolation Risk assessment algorithm of fuzzy fuzzy sensors Interpolation algorithms Microclimate monitoring Psychrometric charts TakagiSugeno (T S) Temperature and humidities Vapor pressure deficit

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