An aircraft actuator that produces the right force but moves too slowly, or moves at the right speed but leaks under load, has still failed \u2014 just not in the way a single-parameter test would catch. Neometrix’s Manual Loading Rig is a high-precision electro-hydraulic test bench built to validate multi-channel aircraft actuators against all four failure modes at once: force, displacement, speed, and sealing performance, in one continuous test sequence.<\/p>\n
A 30,000 kgf load cell verifies output force against commanded load. 250 mm LVDTs, accurate to 0.01%, verify stroke behaviour and travel repeatability. Speed measurement up to 380 mm\/sec confirms the actuator’s output link moves at spec under load, not just that it eventually gets there. And digital pressure transducers monitor the circuit throughout a hold period for sealing performance. An actuator that’s strong but slow, or fast but leaking, fails a real mission profile even if any single measurement in isolation looks acceptable.<\/p>\n
Triple-stage filtration \u2014 20 \u00b5m, 10 \u00b5m, and 5 \u00b5m Pall inline filters with electrical clog detection \u2014 holds NAS 1638 Class 4 cleanliness or better throughout the test. Testing a precision actuator with contaminated hydraulic fluid would introduce test-rig-induced wear or false readings into results meant to validate the actuator itself, which is exactly the kind of measurement error a rig this precise can’t tolerate.<\/p>\n
An Alfa Laval water-cooled heat exchanger, fed by chilled water at 20\u00b0C, keeps hydraulic fluid within a 25\u201340\u00b0C operational band for the duration of testing. Actuator performance \u2014 force output, response speed, seal behaviour \u2014 is genuinely temperature-dependent, so a test that lets fluid temperature drift during a long sequence isn’t comparing the actuator against a stable baseline.<\/p>\n
Constant-load and position-load cylinders apply controlled mechanical load to the actuator under test, reaching a maximum measurable output force of 24,000 kgf. Different validation scenarios call for holding load constant while displacement varies, or holding position constant while measuring the force required to maintain it \u2014 and having both cylinder types on one bench means the rig doesn’t need reconfiguring between test types.<\/p>\n
Why does an actuator test rig need to measure force, displacement, speed, and sealing all together instead of testing each one separately?<\/strong>
\nBecause an actuator can pass any single one of these tests in isolation while still failing to perform correctly in actual service. An actuator that produces the right force but moves too slowly to meet a flight-control response requirement has failed, even though its force output measurement alone would look fine. Similarly, an actuator that reaches full stroke at the correct speed but leaks under sustained load has also failed, in a way a pure speed-and-displacement test wouldn’t catch. Testing all four parameters — force via a 30,000 kgf load cell, displacement and stroke via 250 mm LVDTs at 0.01% accuracy, speed up to 380 mm\/sec, and sealing performance under sustained pressure — in one continuous sequence is what actually confirms the actuator will behave correctly under the combined conditions it will face in real operation, rather than confirming four separate facts about it that don’t add up to a complete picture on their own.<\/p>\n