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 free-running 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 spring-mounted machine |

Impelling force | Fi | [N] | The total force transferred to the base in the case of a rigid-mounted 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, (1-B) or, in case B, expressed as a percentage (100-B). |

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 structure-borne 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 compressionat prescribed residual acceleration: |