Projecte llegit

Títol: Caracterización de válvulas PWM y aplicación práctica en un pulverizador inteligente para tratamientos en viña

---

Estudiant que ha llegit aquest projecte:

RAMOS OLAVE, ANA CAMILA (data lectura: 08-02-2023)
   Cerca aquest projecte a Bibliotècnica

---

Tutor/a o Cotutor/a: GIL MOYA, EMILIO

Departament: DEAB

Títol: Caracterización de válvulas PWM y aplicación práctica en un pulverizador inteligente para tratamientos en viña

Data inici oferta: 20-07-2022      Data finalització oferta: 20-03-2023

---

Estudis d'assignació del projecte:

GR ENG CIEN AGRONOM

Lloc de realització:
EEABB

Segon tutor/a (UPC): SALCEDO CIDONCHA, RAMON

Paraules clau:
PWM, sprayers, drift reduction, pesticides

Descripció del contingut i pla d'activitats:
El proyecto se centra en la caracterización de las válvulas PWM adaptadas a un































pulverizador hidroneumático para la realización de tratamientos fitosanitarios en viña en































base a las características de la vegetación.































































































































Se realizará primero una caracterización de las válvulas pWM para determinar su































funcionamiento y grado de variación del caudal para distintos tipos de boquillas

Overview (resum en anglès): The implementation of pulse width modulation (PWM) solenoid valve actuated nozzles in pesticide application equipment could be an optimal method to achieve variable flow applications; however, there is still little information on the performance. This paper presents the results obtained from several tests to determine the effect of nozzle size, nozzle position, working pressure and duty cycle on the flow rate generated when the nozzle is controlled with a PWM valve. For this purpose, the performance of a set of six PWM nozzles incorporated in a downpipe of an experimental multi-row sprayer for vineyard treatments, equipped with an intelligent PWM valve control system for precision treatments, was studied. Total and individual flow rates were measured for three nozzle models (ISO code 01, 015 and 02), three spray pressures (2, 4 and 6 bar) and ten duty cycles (from 100% to 10%, at 10% intervals). A flow rate measurement with six calibrated measuring cylinders was used to estimate the individual flow rate of each nozzle. Electronic sensors located at the outlet of the pump and at the beginning of the downpipe monitored the liquid pressure and the total flow rate of the circuit. For the same test, all PWM valves always worked with the same nozzle type. For each combination of nozzle, pressure and duty cycle, three repetitions of a minimum duration of 60 s each were performed. The results showed discrepancies between the obtained results and the expected values for the valves. Furthermore, the flow rates were equal between 100% and 80% duty cycle, and then tended to decrease linearly up to 10% duty cycle, although this became more irregular with increasing nozzle size and pressure. Finally, this data was incorporated into the flow control system for precision fungicide treatment. The generated database proved to be useful for the machine to adjust the flow rate appropriately in different areas of the field. Further trials are needed in order to be able to make new vineyard treatments in the future.

---