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Modeling and Model Validation of a Chemical Injection Sprayer System
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Applied Engineering in Agriculture. 32(3): 285-297 . (doi: 10.13031/aea.32.10606) @2016
Authors: Kleber Romero Felizardo, Heitor Vinícius Mercaldi, Paulo Estevão Cruvinel, Vilma Alves Oliveira, Brian L Steward
Keywords: DIS modeling, Dynamic model development, Model simulation, Transport delay, Variable rate application.
The developed models for the chemical DIS were validated via a normalized root mean square error (RMSE) index using a laboratory-scale sprayer test bench built to design sprayers and analyze their performance. These models captured the realistic operation of the chemical injection system including the effect of the transport delay which is dependent on the carrier-chemical mix flow rate. Experimental results of the DIS flow rates and pressure yielded normalized RMSE values lower than 0.4 indicating that the sprayer performance can be efficiently predicted with the developed models. Additionally, experimental curve fitting results for the carrier-chemical mix time constant and transport delay parameters from step changes of the chemical and carrier-chemical flow rates yielded a statistic coefficient of determination R2 close to 1 indicating that these DIS parameters can be efficiently predicted from experimental step responses.(Download PDF) (Export to EndNotes)