Acceleration:

Acceleration is a vector quantity that specifies the time rate of change of velocity.

Amplitude:

Amplitude is the maximum value of a repetitively oscillating quantity (i.e. acceleration, displacement).

Damping:

Damping is dissipation of energy in an oscillating system. It limits the maximum amplitude of  the mechanical system at  natural frequency. The three types of damping generally encountered are: viscous, coulomb and hysteresis.

Free Vibration:

Free vibration is the periodic motion occurring when an elastic system is displaced from its equilibrium position.

Forced Vibration:

Forced vibration is the vibration resulting from the application of an external periodic force.

Foundation (Support):

A foundation is a structure that supports the gravity load of a mechanical system.

Frequency:

Frequency is the number of times the motion repeats itself per unit of time. The unit cycle per second is called Hertz (Hz.).

Isolation:

Isolation is a reduction in the capacity of a system to respond to an excitation. This is attained by the use of a resilient support.

Natural Frequency:

Natural Frequency is the frequency of free vibration.

Periodic Motion:

Periodic motion is a motion that repeats itself at definite intervals of time.

Random Vibration:

Random vibration is vibration whose magnitude is not specified for any given instant of time.

Resonance:

Resonance is the frequency match between the natural frequency of the system and the external forced vibration frequency. Very large amplitudes will occur.

Resonant Frequency:

Resonant frequency is a frequency at which resonance exists.

Shock Absorber:

A shock absorber is a device which dissipates energy to modify the response of a mechanical system to applied shock.

Shock Isolator (Mount):

A shock isolator is a resilient support that tends to isolate a system from shock motion (excitation).

Spring Rate:

Force necessary to produce a unit deflection in an elastic element.

Steady State Vibration:

Steady state vibration exists in a system if the velocity is a continuous periodic quantity.

Transient Vibration:

Transient vibration is temporarily sustained vibration of a mechanical system. It may consist of forced vibration.

Transmissibility:

Percentage of vibratory force or motion transmitted to its support.

Velocity:

Velocity is a vector quantity that specifies the time rate of change of displacement with respect to a reference time.

Vibration:

Vibration is a periodic motion about a position of equilibrium

Vibration Isolator:

A resilient support that tends to isolate a mechanical system from steady state excitation.