Amplitute  A  [m]  Distance moved by a point on a vibrating body measured from its equilibrium position. The total vibration is therefore twice the amplitude 
Frequency  f  [Hz]  Number of oscillations in a given unit of time. Defined in cycles per second or Hz 
Vibration generator frequency  f  [Hz]  Usually the same as the rotational speed of the machine 
Natural frequency  fo  [Hz]  Number of oscillations of a freerunning system per unit of time 
Mass  m  [kg]  Mass of the vibrating system 
Spring force  F  [N]  The resilient force transferred by a spring to a machine or vice versa 
Spring excursion  *  [m]  The deflection of a spring from a neutral position 
Spring rate  k  [N/m]  The force required to compress a vibration damper by 1m, expressed in newtons 
Tuning  Z  –  The ratio of vibration generator frequency f to natural frequency fo 
Disturbance force  Fs  [N]  The force transferred to the base in the case of a springmounted machine 
Impelling force  Fi  [N]  The total force transferred to the base in the case of a rigidmounted machine 
Amplification factor  B  –  The degree of efficiency accompanying the transfer of the vibration force, i.e. the ratio of disturbance force Fs to impelling force Fi. 
Isolation rate  I  –  The degree of efficiency of vibration damping by means of isolation, (1B) or, in case B, expressed as a percentage (100B). 
Damping coefficient  C  [Ns/m]  The reference value for linear viscous damping 
Critical damping coefficient  Ckr  [Ns/m]  The reference value for linear viscous damping for a critical application. A system is critically damped if it returns to its original position after displacement without overshooting displacement without overshooting 
Reduction  R  [db]  Reduction of structureborne sound in dB. 
EQUATIONS TAKEN AS A BASIS FOR CALCUATIONS  
Input data:  Gravitational acceleration g= 9.81 m/s² Mass m [kg] Impulse time tst [s] Or shock class 

Kinetic energy of excitation:  
Energy absorption:  
Stress analysis:  
Dynamic spring rate:  
Static damper compression:  
Natural frequency:  
Residual acceleration:  
Vibration displacement amplitude:  
Static damper compression at prescribed residual acceleration: 