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The vibration is the most common physical phenomenon in the nature, it is the object movement one fundamental mode. The vibration divides into the free vibration, the damped oscillation and the forced oscillation. The free vibration is one ideal condition, usually does not exist, the majority of common vibrations are the damped oscillations. The vibration produces which in under the cyclical external force continually function is a forced oscillation, this kind of periodic external force is called the force strength. If force strength according to sine or cosine rule change, then the stable after forced oscillation also presses the sine or the cosine rule change experiments use are the balance wheel in under the elastic moment of force function, nearby position of equilibrium free oscillation. If adds on the damping moment to the balance wheel, outside force moment of force, then the balance wheel in fact is in the elastic moment of force, damping moment, cycle Under force moment of