Method and apparatus for determining the parameters of natural vibration of a system

• US 4,078,434 A
• Filed: 12/07/1976
• Issued: 03/14/1978
• Est. Priority Date: 05/20/1974
• Status: Expired due to Term

• Current Assignee: BBC Brown Boveri & Company Limited (ABB Limited)
• Original Assignee: BBC Brown Boveri & Company Limited (ABB Limited)
• Inventors: Weberhofer, Josef
• Primary Examiner(s): Ciarlante, Anthony V.
• Application Number:
  US05/748,391
• Time in Patent Office: 462 Days
• Field of Search: 73/67.2, 73/71.2, 73/71.4, 73/558
• US Class Current: 73/593
• CPC Class Codes: G01H 13/00 Measuring resonant frequency
• CPC Class Codes: G01N 2291/2693 Rotor or turbine parts
• CPC Class Codes: G01N 29/12 by measuring frequency or resonance of acoustic waves measuring frequency or resonant frequency of mechanical vibrations or acoustic waves in general G01H1/06, G01H3/04, G01H13/00; acoustic resonators G10K11/04; vibration or shock testing of structures G01M7/00
• CPC Class Codes: G07C 3/00 Registering or indicating the condition or the working of machines or other apparatus, other than vehicles

Abstract

An arrangement for ascertaining the parameters of natural vibrations and dampings of a multi-component dynamic system comprises a vibration detector applied to a component of the system for detecting and producing electrical signals constituting a measure of the mechanical vibrations produced by system internal excitement by stochastic disturbances. A frequency analyzer is connected to the signal output of the vibration detector for analyzing the signals on a progressive basis throughout the entire frequency range being examined to obtain corresponding data from which resonance curves are plotted and from which the natural frequencies and dampings of the system are obtained.

Claims

1. The method of ascertaining the parameters of natural vibrations and dampings of a multi-component dynamic system which comprises the steps of producing signals which constitute a measure of the vibrations produced by system internal excitement by stochastic disturbances, suppressing periodic components of the vibration signals, deriving corresponding resonance curves by frequency analysis of the vibration signals on a progressive basis throughout the entire frequency range being examined and ascertaining from the resonance curves the natural frequencies and dampings of the system'"'"'s natural vibrations.