Study of Pressure Characteristics in PWM Controlled Variable Rate Spraying System

Abstract:

In PWM controlled variable rate spraying system, spraying quantities were regulated by fast switching solenoid valves. However, hydraulic impacts were generated by these fast switching solenoid valves in pipe system, which affected stabilities of spraying quantities and atomization characteristics. In order to study pressure changing regularities when solenoid valves operated, then to design a pressure controller to improve spraying qualities in PWM controlled variable rate spraying system, Fluent was used to simulate pressure characteristics in the pipe system and pressure curves were drawn under the following 3 working conditions, solenoid valve opening, closing, and switching continuously with 5 Hz frequency and 50% duty ratio. Related experiments were carried out to test real pressure signals in the pipe based on a PWM controlled variable rate spraying system. Relative errors between simulation results and experiment results were below 10%. Thus, this simulation model of PWM controlled variable rate spraying system in Fluent was reliable to simulate pressure characteristics in the pipe in other common working conditions, and which contributed to design pressure controller and to optimize the whole PWM controlled variable rate spraying system.

• Periodical: Applied Mechanics and Materials (Volumes 672-674)
• Pages: 1633-1636
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.672-674.1633
• Online since: October 2014
• Authors: Hai Hong Liu, Xin Hua Wei*, Jin Feng Du, Jia Bao Huang
• Keywords: Hydraulic Impact, PWM, Simulation, Soleinoid Valve, Variable Rate Spraying

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