Building a hydraulic pressure test bench for aerospace or defence qualification testing isn't just a plumbing exercise. The control system design determines whether you get Β±0.1% pressure accuracy and EN 13849-compliant safety β or an unsafe rig that fails its first audit.
Control Architecture
Pressure Setpoint (HMI/PLC) β βΌ PID Controller (in PLC) β βΌ Servo Proportional Valve βββ Hydraulic Circuit βββ DUT β² β β β βββββββ Pressure Feedback (transducer, 0-10V or 4-20mA)
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For aerospace-grade accuracy: use a 16-bit ADC for pressure transducer input. A 700 bar range with 16-bit resolution gives 0.01 bar resolution β well within the Β±0.1% target.
PID Tuning for Hydraulic Systems
Hydraulic systems are challenging for PID control due to nonlinear flow characteristics and fluid compressibility.β¦
