Aircraft Electro-Hydraulic Multi-Channel Power Drive Loading Rig, applying up to 24,000 kgf.

Introduction

To ensure aircraft safety and mission readiness, actuators require rigorous acceptance testing, qualification testing, periodic inspection, life-cycle endurance testing and troubleshooting under controlled laboratory conditions. This loading rig recreates in-service aerodynamic loads and dynamic movements, enabling engineers and maintenance teams to accurately validate actuator behaviour, torque capability, load balance between channels, hydraulic leakage, temperature influence, dynamic response curves, stall behaviour and safety-critical performance thresholds.

Functional capability & purpose

The test bench is designed to simulate static, quasi-static and dynamic loads on aircraft power drives, enabling the following operations:

• Force measurement: output load/force up to approx. 24,000 kgf applied at the actuator output shaft or linkage via mechanical lever.
• Displacement/stroke measurement: over the full travel of the actuator.
• Speed measurement: of the output link during extension/retraction cycles up to approx. 380 mm/s.
• Dynamic response evaluation: including rate control, overshoot, hysteresis, and system stiffness.
• Leakage and air-tightness verification: under static or dynamic load conditions.
• Thermal behaviour monitoring: under extended operation cycles.
• Redundancy comparison: functional performance comparison between redundant channels in multi-path actuators.
• Safety validation: cut-off and stall response validation under extreme loading.

Hydraulic power pack / pumping station

A high-pressure electro-hydraulic power unit designed for stable flow and pressure delivery during complex test sequences:

• Electric motor 25 HP, 3-phase 415 V AC powering.
• Variable-displacement axial piston pump (approx. 45 LPM at 245–250 kgf/cm²).
• Stainless-steel hydraulic reservoir, approx. 60 L capacity.
• Multi-stage high-pressure filtration chain (20 µm + 8 µm + 5–6 µm), NAS Class 4 cleanliness with clogging indicators.
• Plate-type water-cooled heat exchanger maintaining 25–40°C oil temperature.
• Safety sensors: low-level shutdown, high-temperature alarm, motor overload, phase failure, filter clog, emergency stop.
• Internal hydraulic manifold with servo-grade solenoid valves, pressure-relief valves and shut-off valves.

The closed-loop pressure control permits accurate load replication without pressure-drop fluctuations during dynamic transitions.

Loading frame & mechanical power transfer

A heavy-duty fabricated steel structure engineered for vibration-free operation and high load endurance:

• Rigid load frame with hardened mounting interface for various actuator sizes.
• Constant-load cylinder (effective area ~68 cm², stroke ±125 mm) and positional/dynamic-load cylinder (effective area ~160 cm², stroke ~105 mm).
• Precision leverage mechanism enabling moment amplification to match aircraft load geometry.
• Universal high-precision load cell (approx. 30,000 kgf) in the direct load path for force measurement.
• High-accuracy LVDT (up to 250 mm travel) for displacement/speed measurement.
• Guided track and bearing blocks to control alignment and reduce side-loads.
• Integrated stainless-steel drip tray to collect oil leakage and route back to tank.

The mechanical amplification design reproduces real aerodynamic loads efficiently while minimising hydraulic stroke requirements.

Control & instrumentation system

An industrial automation architecture combining PLC/DAQ hardware and PC software:

• Industrial PC with custom software for real-time testing and data visualisation.
• 64-channel high-resolution DAQ, 32-bit sampling.
• Multi-channel instrumentation: load, displacement, speed, temperature, differential pressure, power-supply monitoring.
• GUI for test-profile creation, sequence management, live plots (Force–Time, Displacement–Time, Speed–Displacement), and report export in PDF & Excel formats with job-tracking metadata.
• Operator panel with Start/Stop controls, valve actuation switches, pressure/temperature digital indicators and Emergency Stop.

Key features & advantages

• Purpose-built for aircraft flight-control electro-hydraulic power drives.
• Realistic simulation: aerodynamic load simulation with lever-based force amplification.
• Fully computerised: test execution, logging and automatic reporting.
• High precision: ±0.25% instrumentation accuracy.
• Dual-path loading suitable for multi-channel actuator redundancy validation.
• Triple-stage filtration achieving NAS 1638 Class 4 cleanliness.
• Fail-safe protection with alarms & shutdown logic.
• Modular construction allowing easy upgrades and service accessibility.

Summary

The Aircraft Electro-Hydraulic Multi-Channel Power Drive Loading Rig is a mission-critical test platform for validating the performance and safety compliance of aircraft control actuators under realistic loads. Its combination of precision hydraulics, advanced data acquisition, load-simulation accuracy and automated reporting makes it essential equipment for aerospace OEMs, research laboratories, military depots and civil aviation MRO workshops.