JPH06273223A - Malfunction diagnosis method for equipment or group of equipment - Google Patents

Abstract

PURPOSE:To determine the abnormal position or the position of abnormal equipment by measuring the abnormal sound in plural points on an optional plane inside a space, which the abnormal sound reaches, over a frequency range. CONSTITUTION:A sound signal detected by a sound intensity probe 1 is sent to a Fourier conversion part 3 at each points and in each directions, and a cross spectrum and a power spectrum of each of two sound signals are found respectively in the Fourier converting part 3. A selecting part 5 selects a frequency or a frequency range for a sound generated in the case of malfunction of equipment or a group of equipment, and a sound intensity computing part 6 computes active sound intensity and reactive sound intensity. One directional or two directional values on the whole points, which are measured in an abnormal sound generating source determining part 7, are displayed, and the position or the equipment, which is situated on an extension of a perpendicular line lowered on equipment or a group of equipment to be diagnosed, is determined as an abnormal sound generating source, in other words, as an abnormal part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormality diagnosing method which utilizes a sound generated from a facility or a group of facilities to determine a location of a fault in the facility or a group of facilities in a non-contact manner.

[0002]

2. Description of the Related Art A rotating machine typified by an electric motor or a speed reducer, a chemical plant such as a reaction furnace, equipment such as a switchboard, or a group of equipment composed of a plurality of equipment causes abnormalities to occur normally. It is well known that the sound of a specific frequency becomes louder than that of the normal sound, or the sound color is different from that in the normal state. As an example, when scratches such as flaking occur on the inner and outer rings of rolling bearings and rolling surfaces of rolling elements included in electric motors and reduction gears, the normal frequency sound of several kHz, which corresponds to the natural frequency of these rolling bearings, is normal. It will be bigger than it is sometimes.

Conventionally, a method of diagnosing the abnormality of the equipment by utilizing the sound generated from the equipment has been performed. As a method of diagnosing the abnormality of the machine, for example, Japanese Patent Laid-Open No. 63-2810.
No. 25 publication. In this method, the sound pressure of sound generated from the machine is detected, and the abnormality of the machine is determined based on the detection result.

[0004]

However, in the above-mentioned conventional method, since the sound pressure is detected, when the equipments having the same kind of abnormality are installed close to each other or a plurality of equipments in one equipment are installed. There is a problem in that a plurality of sound sources cannot be separated even if the state where abnormal sounds are generated from a plurality of places (sound sources) such as when the same type of abnormality occurs in a place. This is similar to what we hear when listening to stereo, for example, though different sounds are coming out of the left and right speakers, but all sounds are coming out of one point in the center of the stereo. Therefore, the ability to accurately determine the abnormal portion is significantly reduced by detecting only the sound pressure.

Further, since the sound pressure is a scalar quantity, it is not possible to know in which direction the sound source is from the measurement result. That is, when performing a diagnosis for a large number of facilities, it is not possible to grasp even the approximate position of abnormal facilities.

An object of the present invention is to provide a diagnostic method capable of accurately determining the position of an abnormal portion in one piece of equipment or the position of an abnormal piece of equipment in a piece of equipment in the abnormality diagnosis of the piece of equipment or piece of equipment. Is.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a method for diagnosing an abnormality in a facility or a group of facilities by using sound, which is a sound generated from a facility or a group of facilities to be diagnosed when the facility or the facility group is abnormal. A sound is a one-way active and / or reactive sound intensity at a plurality of points over a frequency range that includes the characteristic frequency of the abnormal sound and on any plane in the space that the abnormal sound reaches. And the positive and negative signs of the active sound intensity and / or the reactive sound intensity in the one direction are inverted, and they include one or more measurement points having an outward vector. From the orthogonal line segments,
It is characterized in that a portion or equipment on each vertical surface with respect to the plane lowered to the equipment to be diagnosed or the equipment group is determined to be a source of abnormal sound.

Further, the present invention is a method for diagnosing an abnormality of a facility or a group of facilities by using sound, wherein the sound, that is, the abnormal sound generated from the facility or facility group to be diagnosed when the facility or the facility group is abnormal is detected. Measured as active acoustic intensity and / or reactive acoustic intensity in two directions intersecting each other at a plurality of points on an arbitrary plane in the space where the abnormal sound reaches, over a frequency range including the characteristic frequency of the sound However, from the one or a plurality of measurement points at which the positive and negative signs of the active acoustic intensity and / or the reactive acoustic intensity in the two directions are inverted and which have outward vectors, the facility or equipment to be diagnosed. It was determined that the parts or equipment on each vertical line dropped into the group were the sources of abnormal sound. Characterized in that it.

[0009]

First, the active sound intensity and the reactive sound intensity used in the present invention, and the sound intensity collectively referred to as these will be described.

The sound intensity is defined as the energy of a sound wave passing through a unit area including the point in a unit time at a certain point in the sound field. The sound pressure and the sound wave are expressed by the following equation (1). Is a vector quantity represented by the time average value of the velocity of the medium, that is, the product of the particle velocity.

[Equation 1]

In the equation (1), I is the sound intensity [W / m ² ], p (t) is the instantaneous sound pressure [Pa], u
(T) is also the instantaneous particle velocity [m / s], overline ^- represents an average time. In the cross spectrum method, which is a typical method of measuring the sound intensity, p (t) in Expression (1) is considered as the sound pressure at the center position of a pair of microphones separated by Δr, and is represented by Expression (2). .

[Equation 2] In Expression (2), p ₁ (t) and p ₂ (t) are sound pressures detected by the respective microphones. In addition, u (t) is expressed by Equation (3) from the equation of motion of the medium.

[Equation 3] Here, ρ is the density of a medium such as air [kg /
m ³ ], Δr is the interval [m] between the two microphones.

Now, assuming that ergodicity is established in the sound field, equation (1) can be transformed into equation (4).

[Equation 4]

In the equation (4), f is the frequency, Im [Sp ₁ p
₂ ] is the imaginary part (quad spectrum) of the cross spectrum of p ₁ (t) and p ₂ (t), Sp ₁ and Sp ₂ are the power spectra of p ₁ (t) and p ₂ (t), and π is a circle. The ratio i is an imaginary unit. In the equation (4), since the integrand of the second term on the right side is an odd function, its integral value is 0.
Therefore, only the first term remains. However, if the frequency of interest is a finite frequency between f ₁ and f ₂ ,
Equation (4) can be rewritten as equation (5).

[0014]

[Equation 5]

Here, symbols other than f ₁ and f ₂ are expressed by the formula (4).
Is the same as The real part of the first term on the right side of the equation (5) is called active (effective) sound intensity, and the imaginary part of the second term is called reactive (invalid) sound intensity. Among them, the active sound intensity has a property that it becomes 0 at a position where the distance between the sound source (sound source) and each microphone is equal, and the positive and negative signs are inverted in the vicinity of that position. Further, the reactive sound intensity has a property that it becomes 0 at a position where the sound pressures detected by the two microphones are equal and the positive and negative signs are inverted in the vicinity of that position. The present invention utilizes these properties. Once again, when the active sound intensity and the reactive sound intensity are expressed by the equations, the equations (6) and (7) are obtained.

[0016]

[Equation 6]

[Equation 7] In Expression (6), AI represents active sound intensity [W / m ² ] and in Expression (7), RI represents reactive sound intensity [W / m ² ].

In the present invention, a pair of microphones (a pair of microphones, which are arranged close to each other at a plurality of points on an arbitrary plane in the space where the sound reaches), generate a sound when the facility to be diagnosed or a group of facilities is abnormal. This is called an acoustic intensity probe, and the direction of the line segment connecting the centers of the acoustic detection points of the individual microphones is called the direction of the acoustic intensity probe.) To detect. The detection may be performed by moving one acoustic intensity probe to another point in one direction or two directions, and moving two acoustic intensity probes arranged on two axes intersecting each other. Alternatively, a plurality of locations may be detected at once.

Then, the active sound intensity and the reactive sound intensity in the characteristic frequency range generated when the equipment or group of equipment to be diagnosed is abnormal are calculated from the detected sound data, and the calculated one-direction or two-direction active sound intensities are calculated. A point at which the value of the sound intensity becomes 0 or its positive and negative signs are inverted and the sound intensity has an outward vector is obtained. In the case of one-way measurement, lower the perpendicular to the equipment or group of equipment to be diagnosed from the line segment that is orthogonal to the direction of measurement, and in the case of two-way measurement, perpendicular to the equipment or group of equipment to be diagnosed from that point. If you pull down, you can see that the site or equipment on the vertical surface or extension of the vertical line is the source of abnormal noise. Furthermore, even if the value of active sound intensity does not become 0 or its positive / negative sign does not reverse, the value of reactive sound intensity becomes 0 or its positive / negative sign reverses, and it is an outward vector. If you have
A site or facility on the vertical surface or extension of the vertical line from the line segment or point to the facility or group of facilities to be diagnosed becomes the source of abnormal sound. In addition, when the sound intensity probe is measured while moving, the phenomenon in which the absolute values of the active sound intensity and the reactive sound intensity in the above-mentioned one direction or two directions once increase and then decrease is caused by the sound intensity probe. Indicates that the source of the abnormal sound is approaching.

Since the active sound intensity and the reactive sound intensity represent the flow of sound, even if the number of places where abnormal sound is generated is not only one but two or more, each position is abnormal. Can be determined as the source of sound.

[0020]

EXAMPLES The present invention will be described in detail below based on examples. (FIG. 1) FIG. 1 is a block diagram showing an outline of an embodiment of the present invention. In FIG. 1, 1 is an acoustic intensity probe that can move in space, 2 is an amplifier, 3 is a Fourier transform unit, 4 is a facility information storage unit, 5 is a frequency selection unit, 6 is an acoustic intensity calculation unit, and 7 is Abnormal sound source determination unit, 8
Is a determination result display section.

Sounds generated at the time of abnormality of equipment (not shown) or equipment to be diagnosed are unidirectionally or intersecting (for example, orthogonal) 2 at a plurality of points in a space where the sound reaches by using the sound intensity probe 1. It detects about the direction. The detected acoustic signal is sent to the Fourier transform unit 3 via the microphone amplifier 2 at each point and in each direction, where two acoustic waves (two microphones are provided for each acoustic intensity probe) Determine the respective cross spectrum and power spectrum of the signal. The sound intensity probe 1
As the amplifier 2, a commercially available one may be used.

Next, using these cross spectrum and power spectrum, based on the configuration of the facility or facility group to be diagnosed stored in the facility information storage unit 4, the frequency selecting unit 5 determines that the facility or facility group is abnormal. The frequency or frequency range of the sound that is sometimes generated is selected, and the active sound intensity and the reactive sound intensity at that frequency or frequency range are calculated by the sound intensity calculation unit 6 (equation (6) and equation (7)). reference). The equipment information storage unit 4 stores information on the frequencies of abnormalities of a plurality of equipments or equipment groups to be diagnosed and abnormal sounds generated at that time, so that the equipments or equipment groups can be stored in accordance with each equipment or equipment group. A suitable frequency range can be selected.

Then, in the abnormal sound source determination section 7,
One direction or two for all measured (detected) points
The values of the active acoustic intensity and reactive acoustic intensity of the direction are shown in a vector diagram (for example, the length of the handle of the arrow indicates the magnitude of the absolute value of the active acoustic intensity or reactive acoustic intensity, and the direction of the arrow). , And the contour diagram (for example, the direction in which the sound travels) and the contour diagram (for example, contour maps on a map) are created by connecting the measurement points of the same values of active acoustic intensity and reactive acoustic intensity with a line. (Figure), using a display method such as a bird's-eye view
Value of active acoustic intensity in the direction 0 or its positive and negative signs are inverted, and a vertical surface dropped from the line segment orthogonal to the measurement direction including the point where it has an outward vector to the facility or group of facilities to be diagnosed , Or the value of the active sound intensity in two directions is 0 or the sign of the positive and negative is inverted, and it is on the extension of the perpendicular drawn from the point having the outward vector to the equipment to be diagnosed or the equipment group. The part or equipment is determined to be the source of abnormal sound, that is, the abnormal part.

Further, even if the value of the active sound intensity does not become 0 or its positive and negative signs are not inverted, if the value of the reactive sound intensity becomes 0 or its positive and negative signs are inverted, it becomes 1 The value of reactive acoustic intensity in the direction is 0 or its positive and negative signs are inverted, and the hanging value is dropped from the line segment orthogonal to the measurement direction including the point having the outward vector to the equipment or equipment group to be diagnosed. The value of reactive sound intensity in the plane or in two directions is 0
Alternatively, the sign or sign of the sign is reversed, and the part or equipment on the extension of the normal line drawn to the diagnosis target equipment or equipment group from the point that it has an outward vector is determined to be the source of abnormal noise, that is, the abnormal portion. . The result of the determination is shown on the determination result display unit 8 on a plane including whether the position of the source of the abnormal sound is active acoustic intensity or reactive acoustic intensity.

Example 1 (FIG. 2) FIG. 2 shows the frequency of the radiated sound of a speaker, which is regarded as an abnormal sound, measured by a method of the present invention for one speaker provided to simulate abnormal equipment. 2.5kHz
Including 2.0 kHz (f _{1 in} equation (6)) to 3.0 kHz (f
₂ ) Vertical 320 in the space parallel to the baffle surface 80 mm away from the speaker baffle surface over the frequency range up to
An example is shown in which the measurement is performed as active acoustic intensity in one direction (one-dimensional) at 33 points in the horizontal direction on the plane having a width of mm and a width of 640 mm, and the measurement results of all points are expressed as a one-dimensional vector diagram. At this time, the distance between the two microphones of the sound intensity probe (Δr in Expression (6)) is 12 mm, the outer diameter of each microphone is ½ inch, and the density of air (ρ in Expression (6)). Was 1.27 kg / m ³ .

In this figure, the sign of the active sound intensity is inverted, and the position at which it has an outward vector, and the line of intersection between the perpendicular plane perpendicular to the measurement direction from the speaker to the measurement plane and the measurement plane. It coincides with the position (vertical line in the center). Also, the reactive sound intensity was almost the same as that shown in FIG. That is, this figure shows that the sound is generated from the line segment including the speaker. Therefore, according to the method of the present invention, when an abnormality occurs at one place in one equipment, or when one equipment in the equipment group has an abnormality, the position of the source of the abnormal sound is divided into line segments. It can be determined as any of the above positions.

Example 2 (FIG. 3) FIG. 3 shows the same speaker radiation sound as in Example 1.
An example in which 17 points in the vertical direction and 33 points in the horizontal direction on the same measurement plane are measured as active acoustic intensities in two directions (two dimensions), and the measurement results in all directions are expressed as a two-dimensional vector diagram. Show. In this figure,
The sign of the active sound intensity in the vertical and horizontal axes is inverted, and the position where it has an outward vector and the position of the intersection of the perpendicular line drawn from the speaker to the measurement plane and the measurement plane (○ in the center) Mark) is the same.
Figure 3 also shows reactive sound intensity.
The almost same result was obtained. That is, this figure shows that sound is generated from the speaker. Therefore, according to the method of the present invention, when an abnormality occurs at one place in one equipment, or when one equipment in the equipment group is abnormal, the position of the source of the abnormal sound is accurately determined. Can be determined.

Example 3 (FIG. 4) FIG. 4 shows two speakers of the same kind as in Example 1 and Example 2 which are installed at a distance of 480 mm in order to simulate two abnormal sources. The ratio of the magnitudes of the powers supplied to the speakers are set to be in phase with each other and the left is set to 1 and the right is set to 2, and the radiated sound of the speaker regarded as an abnormal sound includes its frequency of 250 Hz by the method of the present invention. Over the frequency range from 225 Hz to 275 Hz, two directions (two-dimensional) in the vertical 480 mm and horizontal 960 mm planes in the space parallel to the baffle surface 160 mm away from the speaker's baffle surface. The following shows an example of what is measured as the active sound intensity of, and the measurement results of all points and all directions are expressed as a two-dimensional vector diagram. At this time, the distance between the two microphones of the sound intensity probe is 12 mm, the outer diameter of each microphone is 1/2 inch, and the air density is 1.2.
It was set to 7 kg / m ³ . In addition, in this vector diagram, the data of the position of the intermediate point of each measurement point is supplemented by linear interpolation.

In this figure, the signs of the active sound intensities in the vertical and horizontal directions are reversed, and the position has an outward vector, and the vertical lines drawn from the two loudspeakers to the measurement plane respectively. The positions of the points of intersection with the plane (two circles) are almost the same. That is, this figure shows that sound is generated from both of the two speakers.

Comparative Example 1 (FIG. 5) On the other hand, in FIG. 5 as a comparative example, the sound pressure based on the conventional method was measured under the same speaker and the same measurement condition as in Example 3, and a contour diagram thereof was drawn. Show things. In this figure, there are loudspeakers at the two + portions. In addition, the interval of the equal sound pressure lines is 0.45 dB (0 dB = 2 ×
10 ^-5 Pa). In this figure, there is only one point where the peak of sound pressure corresponds to the position of the right speaker, and the position of the left speaker with low power cannot be specified.

As is clear from comparing FIG. 4 and FIG.
According to the method of the present invention, even if an abnormality occurs at two locations in one facility, or if two equipments in the facility group are abnormal, there are a plurality of sources of abnormal sound Can be accurately determined. In this case, the reactive sound intensity cannot specify the position of the left speaker having low power, like the sound pressure.

Fourth Embodiment (FIG. 6) (FIG. 7) Similar to the third embodiment, the same kind as in the case of the first embodiment and the second embodiment, which are installed 480 mm apart, in order to simulate the abnormality generation sources at two places. With respect to two speakers, the ratio of the magnitudes of power supplied to the speakers is set to be 1 in the left and 3 in the right with opposite phases to each other, and the radiated sound of the speaker regarded as an abnormal sound is generated by the method of the present invention. By this, over the frequency range from 225 Hz to 275 Hz including the frequency of 250 Hz, at a height of 480 mm and a width of 960 mm in a plane parallel to the baffle surface 160 mm away from the speaker's baffle surface, 17 points vertically and 33 points horizontally respectively. FIG. 6 shows an example of what is measured as two-dimensional (two-dimensional) active sound intensity and the measurement results of all points and all directions are expressed as a two-dimensional vector diagram. Similarly, FIG. 7 shows an example of what is measured as reactive sound intensity and the measurement results of all points and all directions are expressed as a two-dimensional vector diagram. At this time, the distance between the two microphones of the sound intensity probe was 12 mm, the outer diameter of each microphone was 1/2 inch, and the air density was 1.27 kg / m ³ .

In FIG. 6, there is only one position where the sign of the active acoustic intensity in the vertical and horizontal directions is reversed, and there is only one point at the upper right, and the intersection of the perpendicular line drawn from the two speakers to the measurement plane and the measurement plane. Position (○ in 2 places
It is not possible to specify the position of the lower left speaker with low power. However, even in this case, in FIG. 7, the signs of the reactive acoustic intensities in the vertical and horizontal directions are reversed, and the position where the outward vector is present and the position of the two speakers are substantially the same. There is. That is, even if the user overlooks the active sound intensity, it is possible to know that the sound is generated from both of the two speakers by the reactive sound intensity.

As is apparent from FIGS. 6 and 7, according to the method of the present invention, when there are abnormalities at two places in one facility, or when two facilities in the facility group are abnormal. In the case of, even if the two abnormal sounds are out of phase,
It is possible to accurately determine the position of any of a plurality of sources of abnormal sound.

(FIG. 8) As for the determination result, a method of displaying the state of the radiated sound from the sound source position at the lower left, which could not be specified by the active sound intensity, with smaller and / or thinner arrows than that at the upper right, etc. Then, the sound source position on the measurement plane is represented by the positions of the tails of the four arrows as shown in FIG. 8, for example.

FIG. 9 is a block diagram showing the outline of another embodiment of the present invention. In FIG. 9, reference numerals 9a and 9b denote acoustic intensity probes 10a and 1 having movable measurement axes that are orthogonal to each other on the same plane.
0b is an amplifier, 11a and 11b are Fourier transform units, 12
Is an equipment information storage unit, 13 is a frequency selection unit, 14a, 14
Reference numeral b is a sound intensity calculation unit, 15 is an abnormal sound source determination unit, and 16 is a determination result display unit.

Sound intensity probes 9a and 9b are provided at a plurality of points in the space where the sound reaches the sound that is generated when an abnormality occurs in the equipment or equipment group to be diagnosed (not shown).
Are simultaneously detected in two directions orthogonal to each other. The detected acoustic signals are sent to the Fourier transform units 11a and 11b via the microphone amplifiers 10a and 10b at each point and in each direction, where the cross spectrum and the power spectrum of two acoustic signals in each direction. Ask for. As the sound intensity probes 9a and 9b and the amplifiers 10a and 10b, commercially available ones may be used.

Next, using these cross spectrum and power spectrum, when the equipment or equipment group is abnormal in the frequency selection portion 13 based on the configuration of the equipment to be diagnosed stored in the equipment information storage portion 12, A sound frequency or frequency range to be selected is selected, and active sound intensity and reactive sound intensity in the frequency or frequency range are calculated by the sound intensity calculation units 14a and 14b (see Formula (6) and Formula (7)). ). The equipment information storage unit 12 stores information on the abnormalities of a plurality of equipments or equipment groups to be diagnosed and the frequencies of abnormal sounds generated at that time, so that the equipments or equipment groups can be stored in accordance with each equipment or equipment group. A suitable frequency range can be selected.

Then, in the abnormal sound source determination unit 15, the active sound intensity and the reactive sound intensity in two directions at all measurement (detection) points are displayed using a display method such as a vector diagram, a contour diagram, or a bird's eye view. While displaying, both values of the active acoustic intensity in the two directions become 0 or their positive and negative signs are inverted, and the perpendicular line drawn to the diagnostic target equipment or equipment group from the point that it has an outward vector The part or equipment on the extension is judged to be the source of abnormal sound, that is, the abnormal part. Furthermore, even if the value of active sound intensity does not become 0 or its positive and negative signs are not inverted, the value of reactive sound intensity becomes 0.
Or the sign of the sign is reversed and it has an outward vector, the part or equipment on the extension of the perpendicular drawn from that point to the diagnosis target equipment or equipment group generates abnormal noise. Be the source.

According to this method, the active sound intensity and the reactive sound intensity can be measured in two directions at the same time, so that the measurement time can be shortened. Furthermore, by arranging two acoustic intensity probes in the same position in orthogonal directions and moving them simultaneously while maintaining their positional relationship, by measuring the active acoustic intensity and the reactive acoustic intensity in real time. , The source of abnormal sound can be known on the spot.

When it is known in advance that the frequency or frequency range of abnormal sound is constant depending on the equipment or equipment group to be diagnosed, the equipment information storage unit (4 in FIG. 1, The functions of 12) of FIG. 9 and the frequency selection unit (5 of FIG. 1, 13 of FIG. 9) are unnecessary, and
Originally, these functions may be provided in the sound intensity calculation unit (6 in FIG. 1, 14a, 14b in FIG. 9). Furthermore, if the movement of the acoustic intensity probe is automatically performed using a robot, etc., and the program from the detection of acoustics to the calculation of active acoustic intensity and reactive acoustic intensity is programmed, automation of diagnosis is realized. You can also

[0042]

As is apparent from the above description, by using the method of the present invention, it is possible to know the location of the abnormal sound when a failure occurs in the equipment, and therefore, it is possible to identify the location where a plurality of equipments are installed. It is possible to accurately determine the position of the abnormal equipment or the position of the abnormal portion in one piece of equipment. In particular,
By making the part of the sound intensity probe, which is a sensor, movable in space, it is possible to diagnose abnormalities of a wide range of equipment without touching the equipment with a small number of sensors. Labor saving of diagnostic work can be expected.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of an embodiment of the present invention.

FIG. 2 is an example of a one-dimensional vector diagram representation of an active sound intensity measurement result when there is one abnormal sound generation point according to the method of the present invention.

FIG. 3 is an example of a two-dimensional vector diagram representation of an active sound intensity measurement result when there is one abnormal sound generation position according to the method of the present invention.

FIG. 4 is an example of a two-dimensional vector diagram representation of an active sound intensity measurement result when there are two abnormal sound generation points according to the method of the present invention.

FIG. 5 is an example of a contour diagram representation of sound pressure measurement results when there are two abnormal sound generation points according to the conventional method.

FIG. 6 is an example of a two-dimensional vector diagram representation of an active sound intensity measurement result when there are two abnormal sound generation points according to the method of the present invention.

FIG. 7 is a graph 2 of the reactive sound intensity measurement results in the case where there are two abnormal sound generation points by the method of the present invention.
It is an example of a dimensional vector diagram representation.

FIG. 8 is an example of an abnormal sound source position display result by the method of the present invention.

FIG. 9 is a block diagram showing an outline of another embodiment of the present invention.

[Explanation of symbols]

 1 Sound Intensity Probe 2 Amplifier 3 Fourier Transform Section 4 Equipment Information Storage Section 5 Frequency Selection Section 6 Sound Intensity Calculation Section 7 Abnormal Sound Source Determination Section 8 Determination Result Display Section 9a, 9b Sound Intensity Probe 10a, 11b Amplifier 11a , 11b Fourier transform unit 12 Equipment information storage unit 13 Frequency selection unit 14a, 14b Sound intensity calculation unit

Claims (2)

[Claims] Locations 1. A method of diagnosing an abnormality of a facility or a group of facilities by using sound, wherein a sound, that is, an abnormal sound generated from a facility to be diagnosed or a group of facilities when the facility or the group of facilities is abnormal is characterized by the abnormal sound. Measured as active acoustic intensity and / or reactive acoustic intensity in one direction at a plurality of points on an arbitrary plane in a space reached by the abnormal sound over a frequency range including frequencies, and From the line segment orthogonal to the direction in which the positive and negative signs of the active sound intensity and / or the reactive sound intensity are inverted and which include one or more measurement points having an outward vector, the diagnostic object is obtained. The part or equipment on each perpendicular to the plane lowered to the equipment or equipment group A method for diagnosing an abnormality in a facility or a group of facilities, characterized by determining that the source of the abnormal sound is generated. 2. A method for diagnosing an abnormality of a facility or a group of facilities by using acoustics, wherein a sound, that is, an abnormal sound generated from a facility or a group of facilities to be diagnosed when the facility or the group of facilities is abnormal is characterized by the abnormal sound. A plurality of points on an arbitrary plane in the space where the abnormal sound reaches over a frequency range including frequencies, measured as two-way active acoustic intensity and / or reactive acoustic intensity intersecting each other, and Lower the positive or negative sign of the active acoustic intensity and / or the reactive acoustic intensity in two directions from one or more measurement points at which they have outward vectors to the equipment or equipment group to be diagnosed. It is special to judge that the parts or equipment on each vertical line are the sources of abnormal sound. A method for diagnosing abnormalities in equipment or equipment groups to be collected.