### Abstract

A new simple characterisation of the vibrational source strength
of multi-terminal machinery is formulated in terms of a total
terminal source power. This single power spectrum is determined
from a summation of pairs of mean square velocities and point
mobilities of the machine feet. The method is tested
experimentally for two practical source-receiver configurations.
The results clearly demonstrate the simplicity of the method and
its high potential for engineering evaluation of machinery source
strength and for coarse prediction of power transmission to
supporting structures. In principle this involves a multitude of
interacting source and receiver variables, but from considerations
on the randomness of interacting properties it is deduced that the
total transmission essentially is controlled by simple relations.
This is demonstrated for the two cases and it is revealed that
this relation is a constant, frequency independent value, which
means that the transmitted power at all frequencies is a constant
fraction of the terminal source power spectrum of the machine.

Original language | English |
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Title of host publication | Proceedings of |

Place of Publication | Munich |

Publisher | Technische Universität München |

Publication date | 1998 |

Pages | 383-388 |

Publication status | Published - 1998 |

Event | 3rd European Conference on Noise Control (Euro-Noise '98) - Munich, Germany Duration: 1 Jan 1998 → … Conference number: 3 |

### Conference

Conference | 3rd European Conference on Noise Control (Euro-Noise '98) |
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Number | 3 |

Country | Germany |

City | Munich |

Period | 01/01/1998 → … |

## Cite this

Ohlrich, M. (1998). A simple structural power method for determining the vibratory
strength of machinery sources. In

*Proceedings of*(pp. 383-388). Technische Universität München.