We needed to run cyclic loading for a project. It uses an electo-pneumatic transducer with an input of 0-10 volts with a pnuematic cylinder with a spring return, along with a wave form generator to make it cycle. We did a retrofit to install a pneumatic cyclic loading cylinder on the test press. The cylinder however had its port on the very top. So I had to make a custom bracket to install everything.
I notched the spindle to have access to the top of the pneumatic cylinder and then mounted the electro-pneumatic transducer right too it. Then bolted everything together. Now you can set a peak pressure and then varying the voltage 0-10 volts will load it accordingly.
This was used in K-TRAN: KU-08-3 ▪ FINAL REPORT ▪ January 2013: Tolerable Strains for Hot Mix Asphalt Overlays over Concrete Pavements