System and method for generating a noise index for a mechanical system
First Claim
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1. A method of generating a noise index for a mechanical system, comprising:
- acquiring noise data of the mechanical system over a predetermined frequency range;
choosing a fundamental harmonic frequency;
using the fundamental harmonic frequency to mark harmonic and sub-harmonic data bins for the acquired noise data and recording the amplitude thereof;
averaging a plurality of sub-harmonic bins equally offset from the center of each harmonic frequency and subtracting the average from the preceding harmonic level;
accumulating the results as harmonic content levels indicative of a condition of said mechanical system; and
generating a harmonic noise index based on the accumulated harmonic content levels.
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Abstract
A method and system for generating a noise index for a mechanical system in which noise data is acquired over a predetermined frequency range. A fundamental harmonic frequency is chosen and this fundamental harmonic frequency is used to mark harmonic and sub-harmonic data bins. The amplitude of the harmonic and sub-harmonic data bins are recorded and a plurality of sub-harmonic bins equally offset from the center of each harmonic frequency are averaged and the average is subtracted from the preceding harmonic level. The result is accumulated as harmonic content levels to generate a harmonic index number.
32 Citations
22 Claims
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1. A method of generating a noise index for a mechanical system, comprising:
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acquiring noise data of the mechanical system over a predetermined frequency range;
choosing a fundamental harmonic frequency;
using the fundamental harmonic frequency to mark harmonic and sub-harmonic data bins for the acquired noise data and recording the amplitude thereof;
averaging a plurality of sub-harmonic bins equally offset from the center of each harmonic frequency and subtracting the average from the preceding harmonic level;
accumulating the results as harmonic content levels indicative of a condition of said mechanical system; and
generating a harmonic noise index based on the accumulated harmonic content levels. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for generating a noise index for a mechanical system, said system being configured to:
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acquire noise data of the mechanical system over a predetermined frequency range;
use a fundamental harmonic frequency to mark harmonic and sub-harmonic data bins for the acquired noise data and record the amplitude thereof;
average a plurality of sub-harmonic bins equally offset from the center of each harmonic frequency and subtract the average from the preceding harmonic level;
accumulate the results as harmonic content levels indicative of a condition of said mechanical system; and
generate a harmonic noise index based on the accumulated harmonic content levels. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A computer-readable medium for storing computer-executable instructions for performing steps to generate a noise index for a mechanical system, the steps comprising:
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using a fundamental harmonic frequency to mark harmonic and sub-harmonic data bins for noise data acquired from the mechanical system and recording the amplitude thereof;
averaging a plurality of sub-harmonic bins equally offset from the center of each harmonic frequency and subtracting the average from the preceding harmonic level;
accumulating the results as harmonic content levels indicative of a condition of said mechanical system; and
generating a harmonic noise index based on the accumulated harmonic content levels. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A system for generating a noise index for a mechanical system, said system comprising:
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a data acquisition system for acquiring noise data of the mechanical system; and
a data processing system for using a fundamental harmonic frequency to mark harmonic and sub-harmonic data bins for noise data acquired from the mechanical system and recording the amplitude thereof;
averaging a plurality of sub-harmonic bins equally offset from the center of each harmonic frequency and subtracting the average from the preceding harmonic level;
accumulating the results as harmonic content levels indicative of a condition of said mechanical system; and
generating a harmonic noise index based on the accumulated harmonic content levels.- View Dependent Claims (20, 21, 22)
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Specification