US 2011/0015899 A1 · Vibration Analysis

Abstract

The present invention relates to vibration analysis and in particular, but not limited to, the derivation of multiple types of vibration signals from one vibration signal for vibration analysis. In the preferred method of the invention the vibrations of an object are measured using at least one vibration sensor, wherein the vibration sensor converts vibrations into an electrical vibration signal. The electrical vibration signal is digitized based on a first frequency, wherein the first frequency is selected from a plurality of possible frequency values. A first type of vibration signal is derived from the digitized vibration signal. A second type of vibration signal is then derived from the digitized vibration signal based on a second frequency. The second frequency is rationally determined from, and lower than, the value selected for the first frequency. The invention also provides apparatus for deriving multiple types of vibration signals from one measured vibration signal for vibration analysis.

Claims19

Dependent claims

A vibration analysis method producing multiple types of vibration signals from one vibration signal measured from an object, the method comprising the steps of:

producing a single electrical vibration signal from vibrations of the object;
selecting a first frequency from a set of frequency values;
digitizing the single electrical vibration signal at the first frequency to produce a first digitized vibration signal;
processing the first digitized vibration signal to produce a first representation of the electrical vibration signal;
selecting a second frequency from a set of frequency values rationally determined from and lower than the first frequency;
sub-sampling the first digitized vibration signal at the second frequency to produce a second digitized vibration signal;
and
processing the second digitized vibration signal to produce a second type of vibration signal.

5 more elements

A vibration analysis apparatus producing multiple types of vibration signals from one vibration signal measured from an object, the vibration analysis apparatus comprising:

a vibration transducer converting mechanical vibrations produced by an object into an electrical vibration signal;
an analog-to-digital converter digitizing the electrical vibration signal at a sampling rate corresponding to a first frequency selected from a set of frequency values into a digital vibration signal;
and
a signal processor producing a first type of vibration signal from the digital vibration signal, sampling the digital vibration signal at a second frequency rationally determined from and lower than the first frequency to produce a second digital vibration signal containing a subset of vibration components contained in the electrical vibration signal, and producing a second type of vibration signal from the second digital vibration signal.

1 more element

Dependencies are inferred from the claim text.

Vibration Analysis

Life of this patent

Vibration Analysis

Life of this patent

Abstract

Claims19