Mathematical Model and Characteristic Analysis of Multi-nozzle Flapper Single-stage Electro-hydraulic Servo Valve
Multi-nozzle flapper single-stage electro-hydraulic servo valve is one of the important components of aircraft auxiliary power unit(APU),which plays the role of precise control of fuel flow.According to the unique structure of torque motor,such as asymmetric initial air gap and unilateral four nozzles,the working mechanism was analyzed,and the mathematical model of the whole valve was established.Through MATLAB/Simulink,the mathematical model was simulated and the output characteristics of each component and the whole valve were obtained among them,the electromagnetic torque generated by the asymmetric initial value of the air gap of the torque motor could balance part of the torque generated by the nozzle liquid flow force.The maximum error is 11.4％when the pressure loss of nozzle cavity is considered and when the pressure loss is not considered.At the same time,the experimental study of multi-nozzle valve was carried out.The mathematical model was compared with the flow characteristic curve of the whole valve obtained by the experiment,and the trend was the same,which verified the accuracy of the mathematical model established,and laid the foundation for the characteristic analysis of the multi-nozzle flapper electro-hydraulic servo valve.
single stage servo valvemulti-nozzlemathematical modelflow characteristic
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