JP2018146385A - Blade monitoring device and rotating machine system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blade monitoring device and a rotating machine system capable of easily grasping abnormality of a rotor blade.SOLUTION: A blade monitoring device 30 of a steam turbine having a rotor 3 including: a rotary axis 4 rotating around an axis line O; and rotor blade row group 5 disposed with a rotary blade row 6 with an interval in the direction of axis line O having a plurality of rotary blades 7 extending radially from the rotary axis 4. The blade monitoring device further includes: a detection part 40 provided on a rotor 3 and having a plurality of AE sensors for detecting an AE signal discharged by damage of the rotor blade 7. At least one part of the AE sensor of the detection part 40 is an axial direction AE sensor arranged with gaps therebetween on the rotary axis 4 in the axial line O direction, and includes a blade monitoring device main body 60 including a blade row specifying part for specifying the rotary blade row 6 having the rotary blade 7 generated with abnormality based on a time difference of the plurality of AE signals each inputted from the plurality of axial direction AE sensors.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a blade monitoring device and a rotary machine system.

  For example, a rotary machine such as a steam turbine or a gas turbine has a rotating shaft and a moving blade row group composed of a plurality of moving blade rows provided on the outer periphery of the rotating shaft. During operation of the rotating machine, the vibration of the rotating blade row is measured. By performing such measurement, it is possible to verify whether or not the vibration characteristics of the rotor blade row are as designed. In addition, it is possible to confirm the change in the vibration characteristics of the moving blade due to the change in the operating condition, and to improve the reliability of the turbine product.

For example, Patent Document 1 discloses a technique in which a displacement sensor is provided in a stationary portion that does not contact a moving blade, and the vibration of the moving blade is monitored by the displacement sensor.
In particular, in the low pressure stage where the blade height of the moving blade is large, a non-contact monitor that measures the passing time of each moving blade from the stationary side and calculates the vibration form and amount of vibration by calculating the result is applied. Often.

  Patent Document 2 discloses a technique in which a vibration detection unit is provided in a stationary part that is in sliding contact with a rotor. For example, by installing an accelerometer as a vibration detection unit in the bearing housing, vibration from the blade row group transmitted to the bearing housing is detected by the accelerometer.

JP 2003-177059 A JP-A-53-28806

  By the way, in the technique described in Patent Document 1, particularly in a high pressure stage where the blade height of the moving blade is small, the installation environment of the displacement sensor is bad and the vibration amplitude of the moving blade is small. I can't. Also, depending on the properties of the working fluid such as steam or combustion gas, an error may occur in the detection value of the displacement sensor, and vibration may not be detected appropriately.

Further, in the technique described in Patent Document 2, in order to transmit vibration from the moving blade row group to the bearing housing, it is necessary to pass through vibration damping elements such as a bearing oil film, a bearing, and a bearing housing. Therefore, the quality of the signal itself is deteriorated, and there is a high possibility that the signal is masked by dark vibration.
Therefore, it is difficult to easily detect abnormalities in the moving blades with any technique.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a blade monitoring device and a rotary machine system that can easily grasp abnormalities of a moving blade.

The present invention employs the following means in order to solve the above problems.
That is, in the blade monitoring device according to the first aspect of the present invention, a rotating blade rotating around an axis and a moving blade row having a plurality of moving blades extending radially from the rotating shaft are arranged at intervals in the axial direction. A rotating blade having a rotor, and a plurality of AE sensors that are provided in the rotor and detect AE signals emitted due to abnormalities of the moving blade. At least a part of the AE sensor of the detection unit is an axial AE sensor arranged at an interval in the axial direction on the rotary shaft, and each of the plurality of axial AE sensors A blade monitoring device main body having a blade row specifying unit for specifying the blade row having the moving blade in which an abnormality has occurred is provided based on a time difference between the plurality of input AE signals.

When an abnormality occurs in the blades of any of the blade rows, that is, for example, when the blades are deformed or cracked, the strain energy stored inside the blades is elastic. Released as a wave. The elastic wave is an AE (acoustic emission) signal. Such an AE signal also propagates in the axial direction of the rotating shaft with the moving blade row having the moving blade in which an abnormality has occurred as a base point.
In this aspect, this AE signal is detected by a plurality of axial AE sensors. Each of the axial AE sensors has a different timing for receiving the AE signal depending on the position where the AE sensor is arranged. Based on the time difference of the AE signal reception by each axial AE sensor, the blade row specifying unit calculates the axial position of the location where the AE signal is generated, that is, the moving blade row having the moving blade in which an abnormality has occurred. Can be identified.

  In the blade monitoring apparatus, the rotor is configured by laminating a plurality of disks each supporting the moving blade row in the axial direction, and at least a part of the AE sensors of the detection unit is the same. A circumferential AE sensor disposed on the disk at a circumferential interval, wherein the blade monitoring device main body is based on a time difference between the plurality of AE signals respectively input from the plurality of circumferential AE sensors. In addition, a moving blade specifying unit that specifies the moving blade in which an abnormality has occurred may be provided.

  When an abnormality occurs in any of a plurality of moving blades provided on a specific disk, an AE signal propagates in the disk using the moving blade as a base point. In this aspect, the AE signal is detected by a plurality of circumferential AE sensors. Each circumferential direction AE signal has a different timing for receiving an AE signal depending on where it is arranged. Therefore, the moving blade specifying unit performs the calculation based on the time difference of the AE signal reception by each circumferential direction AE sensor, thereby specifying the moving blade in which an abnormality has occurred.

  The wing monitoring unit includes a transmitter that wirelessly transmits an AE signal detected by the AE sensor, and the wing monitoring device body includes a receiver that receives the AE signal transmitted from the transmitter. It is preferable to have.

  As a result, the AE signal received by the AE sensor attached to the rotating rotor can be easily input to the blade monitoring apparatus main body.

  In the blade monitoring device according to the second aspect of the present invention, a rotating blade rotating around an axis and a moving blade row having a plurality of moving blades extending radially from the rotating shaft are arranged at intervals in the axial direction. A rotor blade having a rotor group, and the rotor is configured by laminating a plurality of disks each supporting the rotor blade row in the axial direction. A detection unit provided on the rotor and having a plurality of AE sensors for detecting an AE signal emitted by an abnormality of the moving blade, wherein at least a part of the AE sensors of the detection unit is on the same disk A circumferential AE sensor arranged at intervals in the circumferential direction, wherein the moving blades in which an abnormality has occurred are determined based on time differences between the plurality of AE signals respectively input from the plurality of circumferential AE sensors. Blades specifying unit for constant may be provided with a blade monitoring device body having a.

  Accordingly, as described above, it is possible to easily detect which one of the moving blades attached to the specific disk has an abnormality.

  A rotary machine system according to a third aspect of the present invention includes the rotary machine and any one of the blade monitoring devices described above.

  According to the blade monitoring device and the rotary machine system of the present invention, it is possible to easily monitor the vibration of the moving blade row group.

It is a typical longitudinal section of the steam turbine system (rotary machine system) concerning a first embodiment. It is a typical side view showing the rotor and AE sensor of the steam turbine system (rotary machine system) concerning a first embodiment. It is a typical lineblock diagram showing an AE sensor unit which has an AE sensor in a steam turbine system (rotary machine system) concerning a first embodiment. It is a figure which shows the hardware constitutions of the wing | blade monitoring apparatus main body in a wing | blade monitoring apparatus in 1st embodiment. It is a functional block diagram of the wing | blade monitoring apparatus main body in the wing | blade monitoring apparatus which concerns on 1st embodiment. It is a graph which shows the AE signal which each AE sensor receives in the steam turbine system (rotary machine system) which concerns on 1st embodiment. It is a typical side view showing the rotor and AE sensor of the steam turbine system (rotary machine system) concerning a second embodiment. It is a functional block diagram of the wing | blade monitoring apparatus main body in the wing | blade monitoring apparatus which concerns on 2nd embodiment.

Hereinafter, a steam turbine system (rotary machine system) according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the steam turbine system 1 includes a steam turbine 2 (rotary machine) and a blade monitoring device 30.

  The steam turbine 2 is an external combustion engine that extracts steam energy as rotational power, and is used for a generator in a power plant. The steam turbine 2 includes a rotor 3, a thrust bearing 8, a journal bearing 9, and a stator 20.

The rotor 3 includes a rotating shaft 4 and a moving blade row group 5.
The rotating shaft 4 has a cylindrical shape extending about an axis O along the horizontal direction. A thrust collar 4 a is formed on a part of the rotating shaft 4. The thrust collar 4a has a disk shape centering on the axis O, and projects integrally from the main body of the rotating shaft 4 to the radially outer side of the rotating shaft 4 so as to form a flange shape.

  As shown in FIGS. 1 and 2, the moving blade row group 5 includes a plurality of moving blade rows 6 provided on the outer periphery of the rotating shaft 4 at intervals in the direction of the axis O. Each moving blade row 6 is configured by arranging a plurality of moving blades 7 extending radially outward from the outer peripheral surface of the rotating shaft 4 at intervals in the circumferential direction. That is, each rotor blade row 6 is constituted by a plurality of rotor blades 7 provided radially at the same position in the direction of the axis O of the rotating shaft 4.

The thrust bearing 8 supports the thrust collar 4a so as to be slidable from both sides in the axis O direction. This restricts the movement of the rotating shaft 4 in the direction of the axis O.
A pair of journal bearings 9 is provided on both ends of the rotary shaft 4 so as to support the rotary shaft 4 from below so as to be rotatable around the axis O.

The stator 20 includes a casing 21 and a stationary blade row group 22.
The casing 21 is provided so as to surround a part of the rotor 3 and the outer peripheral side. The rotating shaft 4 of the rotor 3 passes through the casing 21 in the direction of the axis O. Both ends of the rotating shaft 4 are located outside the casing 21, and are supported by the thrust bearing 8 and the journal bearing 9 outside the casing 21. The rotor blade row group 5 of the rotor 3 is disposed inside the casing 21.

  The stationary blade row group 22 is configured by a plurality of stationary blade rows 23 provided on the inner periphery of the casing 21 at intervals in the axis O direction. Each stationary blade row 23 is configured by arranging a plurality of stationary blades 24 extending radially inward from the inner peripheral surface of the casing 21 at intervals in the circumferential direction. That is, each stationary blade row 23 is configured by a plurality of stationary blades 24 provided radially at the same axis O direction position of the rotating shaft 4. The stationary blade rows 23 are alternately arranged in the direction of the axis O with the moving blade rows 6 of the rotor 3.

  In such a steam turbine 2, the steam introduced into the casing 21 passes through the flow path between the stationary blade row 23 and the moving blade row 6. At this time, the steam rotates the rotor blade 7 to rotate the rotating shaft 4 along with the rotor blade 7, and power (rotational energy) is transmitted to a machine such as a generator connected to the rotating shaft 4. .

Next, the blade monitoring device 30 will be described.
As shown in FIG. 2, the blade monitoring device 30 includes a plurality of AE sensor units 40 (detection units) and a blade monitoring device main body 60.
A plurality of AE sensor units 40 are attached to the outer peripheral surface of the rotating shaft 4 in the rotor 3 with an interval in the direction of the axis O. The AE sensor unit 40 may be disposed, for example, in a recess that is recessed from the outer peripheral surface of the rotor 3.

  In the present embodiment, three AE sensor units 40 are attached. One of these AE sensor units 40 is provided between the moving blade rows 6 in the moving blade row group 5. The remaining two AE sensor units 40 are provided outside the moving blade row group 5 in the axis O direction so as to sandwich the moving blade row group 5 from the axis O direction. Note that four or more AE sensor units 40 may be provided. As long as the plurality of AE sensor units 40 are separated from each other in the direction of the axis O, these AE sensor units 40 can be arbitrarily arranged.

Each AE sensor unit 40 is configured by integrating an AE sensor 41 (axial direction AE sensor), a transmitter 42 and a battery 43.
The AE sensor 41 detects an elastic wave emitted when the moving blade 7 is deformed or cracked as an AE signal. An AE (acoustic emission) signal has a very high frequency component such as several tens of kHz to several MHz. Since a signal having a high frequency is greatly attenuated in the air, it mainly propagates through the rotor 3. The AE sensor 41 has a piezoelectric element that can detect vibrations in the frequency band. As the piezoelectric element, for example, a ceramic piezoelectric element such as PZT (lead zirconate titanate) is used.

  The AE sensor 41 of the present embodiment is tuned so as to be able to detect an elastic wave that is emitted when the blade 7 is deformed or cracked, in particular based on the material and shape of the blade 7. Yes. The detection surface of the AE sensor 41 is in contact with the surface of the rotating shaft 4. Note that an acoustic coupling such as silicon grease may be interposed between the detection surface of the AE sensor 41 and the surface of the rotor 3.

  The transmitter 42 is connected to the AE sensor 41 and receives an AE signal received by the AE sensor 41. The transmitter 42 wirelessly transmits the AE signal to the outside.

The battery 43 has a role of supplying power to the AE sensor 41 and the transmitter 42. As the battery 43, for example, a secondary battery such as a lithium battery can be employed.
In this embodiment, the battery 43 and the transmitter 42 are provided corresponding to each AE sensor unit 40. For example, a plurality of AE sensors 41 are spaced apart from each other in the axis O direction with respect to the rotation shaft 4. And one transmitter 42 for collectively transmitting the AE signals detected by the plurality of AE sensors 41 to the outside, and supplying power to each AE sensor 41 and transmitting power to one transmitter 42. It is good also as a structure provided with the one battery 43 to do. In this case, it is necessary to connect the plurality of AE sensors 41, the single transmitter 42, and the single battery 43 to each other with a cable.

  As shown in FIG. 4, the wing monitoring device body 60 includes a CPU 61 (Central Processing Unit), a ROM 62 (Read Only Memory), a RAM 63 (Random Access Memory), an HDD 64 (Hard Disk Drive), and a signal receiving module 65 (receiver). It is a computer provided with. The signal receiving module 65 receives an AE signal from each AE sensor 41 that is wirelessly transmitted via the transmitter 42. Note that the AE signal wirelessly transmitted by the transmitter 42 may be received and amplified by an amplifier and input to the signal receiving module 65.

As shown in FIG. 5, the CPU 61 of the wing monitoring device main body 60 includes each configuration of a control unit 71, a blade row specifying unit 72, and an alarm unit 73 by executing a program stored in advance in its own device.
The control unit 71 controls other functional units provided in the analysis apparatus.

  The blade row specifying unit 72 specifies the blade row 6 having the moving blade 7 in which an abnormality has occurred based on the time difference between the plurality of AE signals respectively input from the plurality of AE sensors 41. That is, when an abnormality occurs in the moving blade 7 in any one of the moving blade rows 6, the elastic wave propagates with the moving blade row 6 as a base point. The elastic wave propagates in the direction of the axis O of the rotating shaft 4 according to the extending direction of the rotating shaft 4. At this time, in the AE sensors 41 arranged at intervals in the axis O direction, the timing for detecting the elastic wave, that is, the timing for receiving the AE signal is different. For example, as shown in FIG. 6, among the three AE sensors 41, the sensor A first receives the AE signal, and then the sensors B and C sequentially receive the AE signal.

  In the cascade specifying unit 72, based on the time difference between the reception of the plurality of AE signals, the position in the axis O direction serving as the base point of the elastic wave, that is, the moving blade array 6 including the moving blade 7 from which the elastic wave is emitted. Make an extension to identify. More specifically, the blade row specifying unit 72 determines the moving blade row 6 from which the elastic wave has been emitted based on the position of each AE signal stored in advance and the timing of the AE signal received by each AE sensor 41. Perform the specified operation.

  Note that the blade row specifying unit 72 may perform a calculation for specifying the moving blade row 6 only when an AE signal having an amplitude equal to or larger than a predetermined threshold is input. Further, using the intensity of the AE signal received by each AE sensor 41, an operation for specifying the moving blade row 6 in which an abnormality has occurred may be performed. The signal strength of the AE signal decreases as the distance from the moving blade row 6 having the moving blade 7 in which an abnormality has occurred. Therefore, by using the signal strength of the AE signal, the moving blade row 6 in which an abnormality has occurred can be identified more accurately.

  The alarm unit 73 outputs an alarm based on the calculation result of the blade row specifying unit 72. That is, when the blade row specifying unit 72 specifies the moving blade row 6, the alarm unit 73 performs processing to output an alarm indicating that an abnormality has occurred and specifying the moving blade row 6 in which the abnormality has occurred. The alarm unit 73 may perform a process of displaying alarm information on a monitor, or may perform a process of sounding an alarm as an alarm.

Next, the effect of the steam turbine system 1 of this embodiment is demonstrated.
If normal or no abnormality or damage has occurred in each rotor blade 7 of the steam turbine system 1, an elastic wave of a specific frequency will not be emitted from the rotor blade 7, so an alarm is output. There is no.
On the other hand, when deformation or cracks occur in the moving blades 7 of any of the moving blade rows 6, the strain energy stored in the moving blades 7 themselves becomes elastic waves (AE signals). Released. This AE signal propagates in the direction of the axis O of the rotating shaft 4 from the moving blade row 6 having the moving blade 7 in which an abnormality has occurred, and is detected by the AE sensor 41 of each AE sensor unit 40. The AE signal received by each AE sensor 41 is wirelessly transmitted to the wing monitoring apparatus main body 60 via the transmitter 42. In the blade monitoring device main body 60, the blade row specifying unit 72 specifies the moving blade row 6 in which an abnormality has occurred based on the time difference of the AE signal reception from each AE sensor 41. Then, the alarm unit 73 outputs the information as an alarm.

  As described above, in the present embodiment, the AE signal emitted from the moving blade 7 in which an abnormality has occurred is detected by the plurality of AE sensors 41 that are spaced apart from each other in the direction of the axis O of the rotating shaft 4. The moving blade row 6 having the moving blades 7 can be easily identified.

The elastic wave emitted due to the abnormality of the moving blade 7 has a very large frequency compared to other vibrations, and therefore the elastic waves are not masked by other vibrations. Even when the amplitude of the moving blade 7 itself at the time of abnormality is small, the abnormality of the moving blade 7 can be easily detected by detecting the elastic wave at the time of occurrence of the abnormality. Furthermore, the abnormality of the moving blade 7 can be detected stably regardless of the property of the steam that is the working fluid of the steam turbine.
In addition, signals detected by the AE sensors 41 are wirelessly transmitted via the transmitter 42 and input to the wing monitoring device main body 60. Therefore, a complicated wiring configuration is adopted between the rotating side and the stationary side. do not have to.

  Next, a detailed description of the second embodiment of the present invention will be omitted with reference to FIGS. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the second embodiment, the rotating shaft 4 constituting the rotor 3 is configured by laminating a plurality of disk-shaped disks 4b around the axis O in the axis O direction. A plurality of blades 7 are fixed radially to each disk 4b. That is, the moving blades 7 are fixed at the base end to the disk 4b and are arranged at intervals in the circumferential direction so as to extend to the outer peripheral side of the disk 4b.

The blade monitoring device 30A according to the second embodiment includes a plurality of AE sensor units 40A (detection units) and a blade monitoring device main body 60A.
In the AE sensor unit 40A, a plurality (three in the present embodiment) of the specific disks 4b among the plurality of disks 4b are provided at intervals in the circumferential direction. These AE sensor units 40A may be fixed to the disk 4b by being embedded in, for example, a recess formed on the surface of the disk 4b facing the direction of the axis O. In the AE sensor unit 40A, a plurality of four or more may be provided at intervals in the circumferential direction. The plurality of AE sensor units 40A are preferably provided at the same radial position. The plurality of AE sensor units 40A may be provided at different radial positions.

  The AE sensor unit 40A of the second embodiment includes an AE sensor 41A (circumferential AE sensor), a transmitter 42, and a battery 43. The AE sensor 41A of the second embodiment has the same configuration as the AE sensor 41 of the first embodiment, and detects an elastic wave that propagates in the disk 4b in the circumferential direction.

The blade monitoring apparatus main body 60A of the second embodiment includes a control unit 71, a moving blade specifying unit 72A, and an alarm unit 73.
The moving blade specifying unit 72A specifies the damaged moving blade 7 based on the time difference between the plurality of AE signals respectively input from the plurality of AE sensors 41.

  The elastic wave emitted when any one of the moving blades 7 in the specific moving blade row 6 is damaged propagates in the disk 4 b through the proximal end of the moving blade 7. The AE sensor 41 provided on the disk 4b detects elastic waves, but the detection timing of the elastic waves differs depending on the location of the AE sensor 41. The moving blade specifying unit 72A specifies the moving blade 7 that has generated the elastic wave, that is, the moving blade 7 in which an abnormality has occurred, based on the detection timing of the AE signal and the information on the location of each AE sensor 41. . Thereby, the moving blade 7 in which an abnormality has occurred can be easily identified and output as an alarm.

  In the present embodiment, a plurality of AE sensors 41 are provided on a specific disk 4b. However, a configuration in which a plurality of AE sensors 41 are provided on all the disks 4b and a moving blade 7 in which an abnormality has occurred in each disk 4b can be specified. Also good. Further, the AE sensors 41 may be provided on a plurality of arbitrarily selected disks 4b.

  The embodiment of the present invention has been described above, but the present invention is not limited to this, and can be appropriately changed without departing from the technical idea of the present invention.

In the first embodiment, a configuration is described in which the AE sensor 41 is mounted apart in the direction of the axis O of the rotary shaft 4 to identify the moving blade row 6 in which an abnormality has occurred. The configuration is such that the moving blade 7 in which an abnormality has occurred is identified by attaching the AE sensor 41 apart in the direction.
For example, the first embodiment and the second embodiment may be combined to specify the moving blade row 6 and the moving blade 7 in stages. Moreover, it is good also as a structure which performs specification of the moving blade row | line | column 6 and specification of the moving blade 7 separately.

  Further, for example, in the embodiment, the example in which the present invention is applied to the steam turbine 2 has been described, but the present invention may be applied to other rotating machines such as a gas turbine.

DESCRIPTION OF SYMBOLS 1 Steam turbine system 2 Steam turbine 3 Rotor 4 Rotating shaft 4a Thrust collar 4b Disk 5 Rotor row group 6 Rotor row row 7 Rotor blade 8 Thrust bearing 9 Journal bearing 20 Stator 21 Casing 22 Stator blade row group 23 Stator blade row 24 Static Wing 30 Wing monitoring device 40 AE sensor unit 41 AE sensor 42 Transmitter 43 Battery 60 Wing monitoring device main body 61 CPU
62 ROM
63 RAM
64 HDD
65 Signal Receiving Module 71 Control Unit 72 Blade Row Identifying Unit 73 Alarm Unit 40A AE Sensor Unit 41A AE Sensor 30A Blade Monitoring Device 72A Blade Identification Unit 60A Blade Monitoring Device Main Body

Claims (5)

Rotation having a rotor having a rotating shaft that rotates around an axis, and a moving blade row group in which a moving blade row having a plurality of moving blades radially extending from the rotating shaft is arranged at intervals in the axial direction A machine wing monitoring device,
A detector having a plurality of AE sensors provided on the rotor for detecting an AE signal emitted due to an abnormality of the moving blade;
At least a part of the AE sensor of the detection unit is an axial AE sensor disposed on the rotating shaft with a gap in the axial direction,
A blade monitoring device main body having a blade row specifying unit for specifying the blade row having the moving blade in which an abnormality has occurred based on a time difference between the plurality of AE signals respectively input from the plurality of axial AE sensors; Wing monitoring device equipped. The rotor is configured by laminating a plurality of disks each supporting the blade row in the axial direction,
At least a part of the AE sensor of the detection unit is a circumferential AE sensor arranged on the same disk at a circumferential interval,
The wing monitoring device body is
2. The blade monitoring device according to claim 1, further comprising: a moving blade specifying unit that specifies the moving blade in which an abnormality has occurred based on a time difference between the plurality of AE signals respectively input from the plurality of circumferential AE sensors. A transmitter provided on the rotor for wirelessly transmitting an AE signal detected by the AE sensor;
The wing monitoring apparatus according to claim 1 or 2, wherein the wing monitoring apparatus body includes a receiver that receives the AE signal transmitted from the transmitter. Rotation having a rotor having a rotating shaft that rotates around an axis, and a moving blade row group in which a moving blade row having a plurality of moving blades radially extending from the rotating shaft is arranged at intervals in the axial direction A machine wing monitoring device,
The rotor is configured by laminating a plurality of disks each supporting the blade row in the axial direction,
A detector having a plurality of AE sensors provided on the rotor for detecting an AE signal emitted due to an abnormality of the moving blade;
At least a part of the AE sensor of the detection unit is a circumferential AE sensor arranged on the same disk at a circumferential interval,
A blade monitoring device comprising a blade monitoring device main body having a blade specifying unit that specifies the blades in which an abnormality has occurred based on a time difference between the plurality of AE signals respectively input from the plurality of circumferential AE sensors. The rotating machine;
A wing monitoring device according to any one of claims 1 to 4,
A rotating machine system comprising:

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