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ThinkMind // International Journal On Advances in Systems and Measurements, volume 10, numbers 3 and 4, 2017 // View article sysmea_v10_n34_2017_9


Emulating a Sensor for the Measurements of the Hydraulic Resistances of Nozzles in Agricultural Sprayers Based on the Use of the Point-Wise Thévenin's Theorem

Authors:
Rafael F. Q. Magossi
Elmer A. G. Peñaloza
Shankar P. Battachharya
Vilma A. Oliveira
Paulo E. Cruvinel

Keywords: Measurement theory; Parameterized model; Pointwise Thévenin’s equivalent; Electrical-hydraulic analogy; Agricultural quality sensor; Food safety; Risk analysis.

Abstract:
In agriculture, the chemicals should be applied evenly and at a prescribed rate. An accurately calibrated boom will ensure that this is achieved. In addition, the correct use of pesticides can deliver significant environmental and socio-economic benefits in the form of safe, healthy, and affordable food, as well as to decrease the impact in natural resources such as soil, water and overall land use. The quality of pesticides application is dependente on the hydraulic fluidic resistance present in the nozzles of the sprayers. This paper presents a method to evaluate the hydraulic pressure drop in bars of agricultural sprayer systems using the fluid hydraulic resistance as a part of a sensor element associated with point-wise Thévenin’s equivalents. This method makes it possible to control and measure the pressure drop at lower cost and greater accuracy. In this context, taking into account a measurement-based approach, a parameterized relationship among operating conditions and the fluidic resistance was defined. Therefore, it was possible to obtain the hydraulic equivalents of a sprayer system with direct injection based only on the hydraulic flow and pressure measurements. The results have shown that it is possible to obtain the hydraulic equivalent resistances with a relative error equal to 2.15%. Furthermore, the relationship among the orifice nozzle diameter, pressure and flow was also found.

Pages: 184 to 193

Copyright: Copyright (c) to authors, 2017. Used with permission.

Publication date: December 31, 2017

Published in: journal

ISSN: 1942-261x

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