Because we are doing the fatigue test of the vehicle. The load spectrum is defined by force.
MTS Flex Test 200 controls every servo valve to control the corresponding cylinder.
The unstable oscillation phenomenon has happened on different regions of the test object many times.
Depending on...
I revise the attachments.
Because the test is fatigue test, so the loads of all cylinders are not constant. Some cylinders are push and the others are pull.
Every plot contains one cylinder's load command and feedback from the load cell.
The results show the feedback following the command...
Hi, PNachtwey, Thank you for the help.
I used MTS Flex Test 200 to do the fatigue test of the vehicle. The load feedback commands are plotted in the attachment. Those cylinders of 8001 to 8004 subjected to unstable oscillations. I don't know why a stable system became unstable suddenly.
Oil...
I used 40 hydraulic cylinders controlled by one system to conduct vehicle fatigue test. The system was shut down because two cylinders feedback loads oscillating above limit loads (15 Hz instability oscillation). Is it possible a HRF phenomenon? Is it workable to use a wider bore diameter to...
