Any body simulated pneumatic isolators which are used for engine test bed application. We are having a plate of 4000*2000*300 mm plate supported on 4 - isolators from Fabreeka (PAL75-6). We are trying to simulate isolators to analyse vibrations .. We are testing 3 cylinder Gasoline engine with max speed of 6000 RPM.  We are getting vibration above 5100 rpm speed..  !