[1] Experimental unit for investigating torsional vibration and torsional stiffness in demonstrations and student experiments [2] Frame made of aluminium with rubber feet [3] Steel torsion bar, corrosion-resistant [4] 3 mass discs [5] 4 ball bearing mounted bearing units with chucks and 3 hole flange, the bearing units can be positioned as required [6] Sealed oil damper [7] Exciter with drive crank, excitation amplitudes 1.4°, 1.8°, 2.4° [8] 4 angle of rotation sensors, 0.03V/° [9] Electrical exciter control unit with digital frequency display, 10-turn potentiometer and supply for the shaft encoders [10] LabVIEW software for data acquisition via USB under Windows XP or Windows Vista |