|Reference : A FEASIBILITY STUDY OF DEVELOPING DIRECT INJECTION SPRAYING TECHNOLOGY FOR SMALL SCAL...|
|Scientific congresses and symposiums : Paper published in a book|
|Life sciences : Agriculture & agronomy|
Engineering, computing & technology : Electrical & electronics engineering
|A FEASIBILITY STUDY OF DEVELOPING DIRECT INJECTION SPRAYING TECHNOLOGY FOR SMALL SCALE FARMS|
|El Aissaoui, Abdellah [Université de Liège - ULg > > > Doct. sc. agro. & ingé. biol.]|
|Lebeau, Frédéric [Université de Liège - ULg > Sciences et technologie de l'environnement > Mécanique et construction >]|
|el bahir, Lhoussein [National School of Applied Science, P.O Box 575, Marrakech, 40000, Morocco > Department of Electrical Engineering > > >]|
|Destain, Marie-France [Université de Liège - ULg > Sciences et technologie de l'environnement > Mécanique et construction >]|
|Houmy, Karim [Institute of Agronomic and Veterinary Science, P.O Box 6202, Rabat, Morocco > Department of Agricultural Engineering > > >]|
|II. INTERNATIONAL CONFERENCE OF THE CIGR HUNGARIAN NATIONAL COMMITTEE, THE FACULTY OF MECHANICAL ENGINEERING OF THE SZENT ISTVÁN UNIVERSITY, AND THE AGRICULTURAL ENGINEERING BOARD OF THE HUNGARIAN ACADEMY OF SCIENCES|
|Szent István University, Faculty of Mechanical Engineering|
|Synergy in the Technical Development of Agriculture and Food Industry (Synergy2011)|
|October 9-15, 2011|
|CIGR Hungarian National Committee|
|[en] direct injection ; variable rate application ; lag transport|
|[en] The present study focuses on designing hydraulic scheme and process control system for small direct injection
sprayer equipped with five meters' boom (10 tip nozzles) based on DC electrical energy supply. A numerical
model was developed by using finite volume method to study dynamic of concentration change process and to
optimize the hydraulic boom design required to overcome lag transport problem related to real time application.
The schemes of serial and parallel boom layouts were studied to obtain minimal lag transport for chemical
concentration change process. The process control system was modelled in Matlab-SimulinkTM, and a laboratory
test bench was implemented with a PID (Proportional Integral Derivative) feedback control for evaluating the
performance of the constant carrier flow and the variable total flow strategies.
The results of the hydraulic modelling of the serial boom layout showed that 6 mm boom diameter gave a
satisfying performance in term of application uniformity (up to 97%) and lag transport along nozzles (from 0.8
to 1.5 s). The prospection of parallel scheme by feeding individually nozzles gave an even reduced lag transport
(2 s) along the boom (diameter of 4 mm).
The modelling of constant carrier flow control strategy showed a lag time of 2.5 s for the step speed change of
0.6 to 1.2 m/s at constant pressure of 2 bars. The total flow control strategy showed the advantage of reducing
lag transport from 4 to 2.3 s when speed varied from 0.6 to 1.2 m/s in accordance with operating pressure (from
1 to 3 bars). The experimental tests showed the importance of varying carrier flow rate to improve the controller
dynamic in comparison to the constant carrier flow control.
|Commission universitaire pour le Développement - CUD|
|Researchers ; Professionals|
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