METHOD FOR ASSIGNING PEAK CODES USING REGION PARTITION SCHEME, THE PEAK CODES FOR THE METHOD, AND METHOD FOR PREDICTING/DIAGNOSING FAULTY OPERATION OF MECHANICAL DEVICE USING PEAK CODES

• US 20090043518A1
• Filed: 08/05/2008
• Published: 02/12/2009
• Est. Priority Date: 08/09/2007
• Status: Abandoned Application

• Current Assignee: Sung-Chan Do
• Original Assignee: Sung-Chan Do
• Inventors: ROH, Chang-Su, CHONG, Ui-Pil
• Application Number:
  US12/186,210
• Publication Number:
  US 20090043518A1
• Time in Patent Office: Days
• US Class Current: 702/56
• CPC Class Codes: G01H 1/003 of rotating machines G01H1/10 takes precedence

Abstract

A method for assigning a peak code using a region partition scheme, the peak code for use in the method, and a method for diagnosing a faulty operation of the mechanical device using the peak code are disclosed. The method analyzes a frequency of either a unique operation sound or vibration signal generated when each normal-status mechanical device is operated, acquires a normal peak code, and compares the acquired normal peak code with a measurement peak code acquired by analyzing a frequency of either a unique operation sound or vibration signal measured from a measurement-objective mechanical device, such that it determines the presence or absence of a faulty operation of each mechanical device according to the result of the comparison.

Claims

1. A method for assigning a peak code using a region partition scheme comprising:

a) acquiring either an operation sound or vibration signal generated when a mechanical device is operated;

b) performing a Fast Fourier Transform 0(FFT) scheme on a frequency of either the operation sound or the vibration signal, and indicating a magnitude of the FFT-resultant frequency on a FFT graph composed of several FFT cells which include intervals of predetermined frequency bands and predetermined-sized intervals;

c) determining whether a peak value is located at each FFT cell, searching for the highest peak value from among individual peak values, and determining the searched peak value to be a maximum peak value;

d) dividing a vertical-axis area into a predetermined number of equal division parts on the basis of a height of the maximum peak value, and indicating the FFT-resultant frequency magnitude on a normal graph composed of several normal cells which include intervals of predetermined frequency bands and predetermined-sized intervals;

e) searching for the highest peak value from among several peak values located at each horizontal-axis interval having the predetermined frequency-band interval in the normal graph, and determining the searched peak value to be an interval peak value;

f) indicating a specific character ‘

F’

at a head part of resultant information acquired by the above steps a)˜

e) in order to simultaneously represent the resultant information in the form of a code-format visual value, in which the specific character ‘

F’

indicates that a code has already been acquired when the frequency of either the operation sound or the vibration signal is analyzed according to the FFT scheme;

g) indicating not only a frequency division interval but also a character ‘

X’

indicating a horizontal-axis division interval at a position located behind the ‘

F’

character, and indicating not only the number of equal division parts acquired from the vertical axis of the normal graph on the basis of the maximum peak value but also a character ‘

Y’

;

h) sequentially indicating peak addresses at a position located behind the ‘

Y’

character in the order of frequency areas in order to compare a peak value of each interval with the maximum peak value using an integer ratio, indicating the maximum peak value by a specific character ‘

P’

, and indicating the remaining interval peak values by integers marked on the normal graph such that vertical-axis area coordinates of each normal cell including each interval peak value are indicated by the integers; and

i) numerically indicating the maximum peak value of the FFT graph at a position behind the indicated peak address of the step h).

2. The method according to claim 1, further comprising:

indicating a sign to easily discriminate areas located between the peak address and the maximum peak value at either the step h) for indicating the peak address by the ‘

P’

character or numerals or the step i) for numerically indicating the maximum peak value of the FFT graph.

3. The method according to claim 1, wherein the horizontal axis of the step g) for establishing an interval between the FFT cells on the FFT graph is divided by a frequency band of 100 Hz.

4. The method according to claim 1, wherein the vertical axis of the step g) for dividing the normal cell of the normal graph into a predetermined number of equal parts has a specific maximum peak value which allows the predetermined number of equal parts to be ‘

10’

.

5. The method according to claim 1, wherein the step c) for determining whether the peak value is located at each FFT cell, searching for the highest peak value from among the individual peak values, and determining the searched peak value to be the maximum peak value further includes:

determining whether the number of peak values contained in each normal cell including the interval peak value is at least ‘

2’

; and

if it is determined that the at least two values are located in the normal cell including the interval peak value, additionally indicating the determined information at a peak address.

6. The method according to claim 5, wherein the number of peak values contained in the normal cell including the indicated interval peak value is represented by script at one side of an upper part of each peak address.

7. A peak code comprising:

code-formatted characters and numbers according to the method of claim 1, wherein the code-formatted characters and numbers are printed on a paper.

8. The peak code according to claim 7, wherein the paper is configured in the form of a sticker capable of being attached to a mechanical device.

9. A method for diagnosing a faulty operation of a mechanical device using a peak code comprising:

a) comparing a normal peak code acquired from a normal-state mechanical device with a measurement peak code acquired from a measurement-objective mechanical device according to the method of claim 1, and determining whether the result of the comparison between the normal peak code and the measurement peak code exceeds a range of an allowable error; and

b) if the comparison result between the normal peak code and the measurement peak code exceeds the range of the allowable error, determining that the measurement-objective mechanical device is in an abnormal status such that a faulty operation of the measurement-objective mechanical device is predicted.

10. The method according to claim 9, wherein the step a) for comparing the normal peak code with the measurement peak code includes:

determining whether there is a difference in location between cells, each of which includes a character ‘

P’

.