Differanate between natural vibation and resonase vibration wike pidia
Answers
Forced Vibrations & Resonance
Free vibrations are oscillations where the total energy stays the same over time. This means that the amplitude of the vibration stays the same. This is a theoretical idea because in real systems the energy is dissipated to the surroundings over time and the amplitude decays away to zero, this dissipation of energy is called damping.
Free vibration
free vibration graph
Light damping
light damping graph
Heavy damping
heavy damping graph
Critical damping
critical damping graph
Overdamped
overdamped graph
Forced vibrations occur when the object is forced to vibrate at a particular frequency by a periodic input of force.
Objects which are free to vibrate will have one or more natural frequency at which they vibrate,
If an object is being forced to vibrate at its natural frequency, resonance will occur and you will observe large amplitude vibrations. The resonant frequency is fo.
resonance graph
Effect of damping on resonance graph.
The amplitude of the resonance peak decreases and the peak occurs at a lower frequency.
resonance damping graph
Phase and resonance
The phase relationship between the driving oscillation and the the oscillation of the object being driven is different at different frequencies.
Below resonance they are in phase with each other.
At resonance the phase relationship is 90o or p/2 rad.
Above resonance the phase relationship is 180o or p rad.