Critical speeds 1 Main vibration problems Critical speeds 2 Jeffcott rotor 1 Jeffcott rotor 2 Jeffcott rotor 3 Damped Jeffcott rotor 1 Damped Jeffcott rotor 2 Damped Jeffcott rotor 3 Damped Jeffcott rotor 4 Damped rotor 1 Damped rotor 2 Experimental coast down transient 1 Experimental coast down transient 2 Experimental coast down transient 3 Unbalance Rigid rotor balancing Rotor vibration and phase measurement Balancing planes Approximated vibration modes Experimental case 1 Experimental case 2 Simulation 1 Simulation 2 Simulation 3 Simulation 4