ANALYSIS OF ROTATING MACHINES
First Claim
1. A method for analyzing a physical system having a rotating element, the method comprising:
- receiving a tachometer signal from a tachometer, wherein the tachometer signal comprises rotation speed information for the rotating element;
determining a time sequence using the tachometer signal, wherein the time sequence comprises time values for the rotating element at substantially equal angle increments;
applying a first digital interpolation filter to the time sequence to generate a modified time sequence;
receiving a digital data signal, wherein the digital data signal comprises a second plurality of samples, and wherein the digital data signal comprises data for the rotating element at substantially equal time increments;
applying a second digital interpolation filter to the digital data signal to generate a modified data signal;
re-sampling the modified data signal using the modified time sequence to generate an angle domain data signal, wherein the angle domain data signal comprises data signal values at substantially equal angle increments, and wherein the angle domain data signal is usable to analyze the physical system.
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Abstract
System and method for analyzing an input signal acquired from a physical system with a rotating element. A tachometer signal is received comprising rotation speed information for the rotating element. A time sequence is determined using the tachometer signal, comprising time values for the rotating element at substantially equal angle increments, e.g., by edge detection software or timer/counter. A software-based first digital interpolation filter, e.g., a Cascade-Integrator-Comb filter, is applied to the time sequence, generating a modified time sequence. A digitized data signal is received comprising data for the rotating element at substantially equal time increments. A second software-based digital interpolation filter is applied to the data signal, generating a modified data signal which is re-sampled using the modified time sequence to generate an angle domain data signal, comprising data signal values at substantially equal angle increments, where the angle domain data signal is usable to analyze the physical system.
27 Citations
27 Claims
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1. A method for analyzing a physical system having a rotating element, the method comprising:
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receiving a tachometer signal from a tachometer, wherein the tachometer signal comprises rotation speed information for the rotating element;
determining a time sequence using the tachometer signal, wherein the time sequence comprises time values for the rotating element at substantially equal angle increments;
applying a first digital interpolation filter to the time sequence to generate a modified time sequence;
receiving a digital data signal, wherein the digital data signal comprises a second plurality of samples, and wherein the digital data signal comprises data for the rotating element at substantially equal time increments;
applying a second digital interpolation filter to the digital data signal to generate a modified data signal;
re-sampling the modified data signal using the modified time sequence to generate an angle domain data signal, wherein the angle domain data signal comprises data signal values at substantially equal angle increments, and wherein the angle domain data signal is usable to analyze the physical system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for analyzing an input signal, the system comprising:
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an input;
a processor coupled to the input;
a memory medium coupled to the processor which stores analysis software;
wherein the input is operable to;
receive a tachometer signal from a tachometer, wherein the tachometer signal comprises rotation speed information for a rotating element of a physical system; and
receive samples of an input signal, wherein the input signal is sampled in time, wherein the input signal comprises information related to an attribute of the rotating element, and wherein the input signal comprises data for the rotating element at substantially equal time increments;
wherein the analysis software is executable by the processor to;
determine a time sequence based on the tachometer signal, wherein the time sequence comprises time values for the rotating element at substantially equal angle increments;
apply a first digital interpolation filter to the time sequence to generate a modified time sequence;
apply a second digital interpolation filter to the samples of the input signal to generate a modified input signal; and
re-sample the modified input signal using the modified time sequence to generate an angle domain signal, wherein the angle domain signal comprises signal values at substantially equal angle increments, and wherein the angle domain signal is usable to analyze the physical system. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A carrier medium which stores program instructions for analyzing a physical system having a rotating element, wherein the program instructions are executable to perform:
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receiving a digital tachometer signal, wherein the digital tachometer signal comprises a first plurality of samples, and wherein the digital tachometer signal comprises rotation speed information for the rotating element;
determining a time sequence using the digital tachometer signal, wherein the time sequence comprises time values for the rotating element at substantially equal angle increments;
applying a first digital interpolation filter to the time sequence to generate a modified time sequence;
receiving a digital data signal, wherein the digital data signal comprises a second plurality of samples, and wherein the digital data signal comprises data for the rotating element at substantially equal time increments;
applying a second digital interpolation filter to the digital data signal to generate a modified data signal; and
re-sampling the modified data signal using the determined time sequence to generate an angle domain data signal, wherein the angle domain data signal comprises data signal values at substantially equal angle increments, and wherein the angle domain data signal is usable to analyze the physical system.
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27. A system for analyzing an input signal, the system comprising:
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means for receiving a tachometer signal, wherein the digital tachometer signal comprises rotation speed information for the rotating element;
means for determining a time sequence using the tachometer signal, wherein the time sequence comprises time values for the rotating element at substantially equal angle increments;
means for applying a first digital interpolation filter to the time sequence to generate a modified time sequence;
means for receiving a digital data signal, wherein the digital data signal comprises a plurality of samples, and wherein the digital data signal comprises data for the rotating element at substantially equal time increments;
means for applying a second digital interpolation filter to the digital data signal to generate a modified data signal; and
means for re-sampling the modified data signal using the determined time sequence to generate an angle domain data signal, wherein the angle domain data signal comprises data signal values at substantially equal angle increments, and wherein the angle domain data signal is usable to analyze the physical system.
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Specification