The field of reducing torsional vibration of mechanical systems hasseen the emergence of new flexible coupling designs. Our attention is focused onflexible pneumatic couplings. The flexible member of this coupling design is apneumatic bag. The typical basic feature of such couplings is that the pneumaticbag allows for a change in air pressure. In the course of developing pneumaticcouplings, we have experimented with the use of technical gases other than air forfilling pneumatic bags. The aim has been to verify the impact of pneumaticcouplings filled with other technical gases on the magnitude of torsional vibrationin the mechanical system. For verification itself, two different gases have beenused: helium, whose density is lower than air density, and propane butane, whosedensity is higher than air density. Experimental verification was performed underlaboratory conditions on a mechanical system where torsion vibration wasproduced by a piston compressor.
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