Vibration it can be very harmful – leading to eventual failure of the system. Consequently, one of the major reasons for vibration analysis is to predict when this type of resonance may occur and then to determine what steps to take to prevent it from occurring. As the amplitude plot shows, adding damping can significantly reduce the magnitude of the vibration. Also, the magnitude can be reduced if the natural frequency can be shifted away from the forcing frequency by changing the stiffness or mass of the system. If the system cannot be changed, perhaps the forcing frequency can be shifted
Per-unit system are the same. Here, the per-unit voltages of the two sides are E and E respectively. formula_28 ‘E and E are the voltages of sides 1 and 2 in volts. N is the number of turns the coil on side 1 has. N is the number of turns the coil on side 2 has. V and V are the base voltages on sides 1 and 2. formula_29 For current, we can prove that the per-unit currents of the two sides are the same below. formula_30 where I and I are the per-unit currents of sides 1 and 2 respectively. In