JP5463188B2 - Governor room abnormality detection method and governor room abnormality detection system - Google Patents

Description

  The present invention relates to a governor room abnormality detection method and a governor room abnormality detection system for detecting an abnormality in a governor room containing a plurality of devices including a governor.

  The conventional method for detecting abnormalities in the governor room is that an inspector goes to the governor room, listens to the sound of the room in the governor room by ear, and determines that there is an abnormality in the governor room when the room sound is felt different from normal. Met. As a related art related to the present application, there is known a technique for measuring the flow rate of a governor based on the sound of the governor detected by a microphone (see, for example, Patent Document 1).

JP 2004-191103 A (paragraphs [Claim 5], [0025])

  However, in the conventional governor abnormality detection method that relies on the inspector's hearing, the determination criterion is unstable, and the determination result may vary. In addition, since the room sound in the governor room varies from one governor room to another, considerable skill is required to distinguish between normal room sound and abnormal room sound for each governor room, and it takes time to train inspectors. There was a problem.

  The present invention has been made in view of the above circumstances, and provides a governor room abnormality detection method and a governor room abnormality detection system capable of accurately detecting an abnormality in a governor room without requiring the skill of an inspector. With the goal.

  In order to achieve the above object, the governor room abnormality detection method according to the invention of claim 1 corresponds to a plurality of sound sources including the governor in the governor room, and controls the sound volume for each specific frequency band specific to each sound source. Set a reference tolerance, acquire room sound of the governor room, determine whether the volume of the room sound exceeds the reference tolerance for each specific frequency band of each sound source, and It is characterized in that abnormality notification is performed when the volume of the room sound of one sound source exceeds the reference allowable value.

  According to a second aspect of the present invention, in the governor room abnormality detection method according to the first aspect of the present invention, a flow rate conversion means is prepared in which a volume in a specific frequency band specific to the governor is associated with a flow rate flowing through the governor. Based on the volume of the room sound in a specific frequency band, the flow rate flowing through the governor is detected by the flow rate conversion means, and when the flow rate exceeds a predetermined reference flow rate, an abnormal notification is given that the governor volume has exceeded the reference allowable value. It is characterized by what it does.

  According to a third aspect of the present invention, in the governor room abnormality detection method according to the second aspect, the volume of a specific frequency band specific to the governor is measured, and the flow rate actually flowing to the governor with respect to the volume is measured. It is characterized in that correction data is generated from the difference between the actually measured flow rate, the volume in the specific frequency band of the governor and the flow rate detected based on the flow rate conversion means, and the flow rate conversion means is corrected with the correction data.

  According to a fourth aspect of the present invention, in the governor room abnormality detection method according to any one of the first to third aspects, one of a plurality of sound sources is a human vocal cord, and the vocal cords are included in the indoor sound of the governor room. It is characterized in that abnormality detection is performed when the volume of the specific frequency band of the above becomes larger than the reference allowable value.

According to a fifth aspect of the present invention, there is provided a governor room anomaly detection system that is unique to each sound source, corresponding to the microphone for acquiring the room sound of the governor room that can accommodate a plurality of sound sources including the governor, and the plurality of sound sources. A plurality of specific frequency bands are stored, a sound source data storage unit that stores a plurality of preset sound volume reference tolerances for each specific frequency band, and a room sound in the governor room is acquired through a microphone, and the sound source data storage unit stores the sound. Reference comparison and determination means for determining whether or not the volume of the room sound for each specific frequency band exceeds the reference allowable value, and the volume of the room sound in at least one specific frequency band among the plurality of specific frequency bands is the reference allowable value When there is an error, the apparatus is characterized in that it is provided with an abnormality notifying means for notifying an abnormality.

  According to a sixth aspect of the present invention, in the governor room abnormality detection system according to the fifth aspect, the flow rate conversion means that associates the volume of the specific frequency band specific to the governor with the flow rate of the governor, and the specific frequency band of the governor. A flow rate detecting means for detecting a flow rate through the governor by the flow rate conversion means based on the volume of the room sound, and the reference comparison and determination means is configured such that the volume of the governor is the reference when the flow rate exceeds a predetermined reference flow rate. It is characterized in that it is determined that the allowable value has been exceeded.

  According to a seventh aspect of the present invention, in the governor room abnormality detection system according to the fifth or sixth aspect, as one of the plurality of sound sources, the tip of the branch pipe branched from the gas supply path is disposed in the water stored in the container. Normally, the water pressure inside the container is prohibited from releasing the gas into the container, but when the gas pressure in the gas supply path exceeds the water pressure, a water seal is provided to release the gas into the water from the branch pipe. The microphone is characterized in that it can detect sound generated when gas is released into water.

  According to an eighth aspect of the present invention, in the governor room abnormality detection system according to any one of the fifth to seventh aspects, the volume of the specific frequency band unique to the governor varies beyond a preset variation range. In addition, the present invention is characterized in that hunting detection means is provided for determining whether or not the fluctuation period exceeds a preset allowable range and the fluctuation exceeds a preset number of times.

  A ninth aspect of the present invention provides the governor room abnormality detection system according to any one of the fifth to eighth aspects, wherein the determination result by the reference comparison determination means is transmitted to the abnormality notification means via the communication network. It has the feature in having.

  According to a tenth aspect of the present invention, in the governor room abnormality detection system according to any one of the fifth to ninth aspects, a human vocal cord is set as one of a plurality of sound sources, and a room in a specific frequency band of the vocal cord is set. It is characterized in that abnormality notification is performed by the abnormality notification means when the sound volume exceeds the reference allowable value.

[Inventions of Claims 1, 5 and 9]
According to the first and fifth aspects of the present invention, the volume of the room sound of at least one sound source out of the plurality of sound sources in the governor room has a reference allowable value set in advance for a specific frequency band specific to the sound source. Since the abnormality is notified when it exceeds, it is possible to accurately detect the abnormality in the governor room without requiring the skill of the inspector. Here, the abnormality notification may be performed in the governor room or may be performed in a remote place away from the governor room. Specifically, as in the ninth aspect of the invention, a communication device may be provided that transmits the determination result by the reference comparison determination unit to the abnormality notification unit via the communication line. In this way, it is not necessary for the inspector to actually go to the governor room to inspect the abnormal sound, and it is possible to monitor whether there is an abnormality in real time.

[Inventions of Claims 2 and 6]
According to the second and sixth aspects of the invention, it is possible to detect the flow rate of the governor and the abnormality of the governor from the volume of the specific frequency band specific to the governor.

[Invention of claim 3]
According to the invention of claim 3, since the flow rate conversion means can be corrected according to the installation environment of the governor, the flow rate flowing through the governor and the governor abnormality can be detected more accurately.

[Inventions of Claims 4 and 10]
According to invention of Claim 4 and 10, it can detect that the person has entered the governor room.

[Invention of Claim 7]
According to the seventh aspect of the present invention, when the gas pressure in the gas supply pipe is abnormally increased or when the water in the water sealer is insufficient, the gas is released into the water. Water shortage can be detected.

[Invention of Claim 8]
According to invention of Claim 8, the abnormal fluctuation | variation (hunting) of the flow volume in a governor is detectable.

The conceptual diagram of the governor room provided with the governor room abnormality detection system concerning one embodiment of the present invention. (A) Conceptual diagram of governor monitoring device, (B) Conceptual diagram of governor monitoring device Flow chart of abnormal sound detection program Hunting detection program flowchart Graph showing the relationship between flow rate and sound pressure level (A) Conceptual diagram of flow rate conversion database, (B) Conceptual diagram showing specific frequency band specific to water sealer before and after correction Frequency spectrum when gas is released into water seal Human voice frequency spectrum Sound waveform when hunting occurs Flow chart of abnormal sound detection program according to modification

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. Reference numeral 10 in FIG. 1 denotes governor chambers 10 provided at various locations in the city gas supply network. The supply area in which the city gas supply network is stretched is usually divided into a plurality of regional blocks, and a governor chamber 10 is provided for each of the plurality of regional blocks.

  A governor 11 is provided in the governor chamber 10. The governor 11 reduces the gas at a relatively high pressure (for example, 100 KPa or more) supplied from the gas manufacturing plant to a predetermined set pressure (for example, less than 3 KPa) and opens the valve so that the set pressure is maintained. The degree is automatically adjusted.

  In the chamber of the governor chamber 10, there are an opening meter 19 for detecting the valve opening of the governor 11, pressure sensors 12, 12 for detecting the primary pressure and secondary pressure of the governor 11, and the primary side of the governor 11. An emergency shut-off device 13 provided, a water sealer 14 provided on the secondary side of the governor 11 and the like are provided.

  An on-site monitoring device 20 is provided outside the governor chamber 10, and is connected to the opening meter 19, the pressure sensors 12, 12, the emergency shut-off device 13, and the gas leak detection sensor 30 by wire or wirelessly. The on-site monitoring device 20 adjusts the valve opening degree of the governor 11 based on the detection results of the pressure sensors 12 and 12. Further, for example, when a seismometer (not shown) provided in the governor chamber 10 detects a vibration, the emergency shut-off device 13 is operated to stop the gas supply to the regional block downstream from the governor 11.

  The water sealer 14 includes a container 15 in which water is stored with a space in the upper portion, and a branch pipe 16 branched from a gas conduit on the secondary side of the governor 11. It is located in the water in the container 15. Under normal conditions, the water pressure in the container 15 and the secondary pressure of the governor 11 are balanced, and no gas is released from the branch pipe 16 into the container 15. On the other hand, when the secondary pressure of the governor 11 increases or the water in the water sealer 14 decreases and the balance between the secondary pressure and the water pressure cannot be obtained, the gas flows into the water in the container 15 through the branch pipe 16. Released. The gas released into the water is released from the space above the water surface of the container 15 through the discharge pipe 17 to the outside (atmosphere) of the governor chamber 10.

  A microphone 18 is installed in the governor room 10. The microphone 18 is disposed at a position where the room sound of the governor room 10 can be collected over a wide range. For example, sound generated from equipment provided in the governor chamber 10 such as gas passing sound generated when gas passes through the governor 11 and bubbling sound when gas is released into the water in the water seal 14 The sound emitted from a plurality of sound sources such as the voice of a person who entered the governor room 10 can be collected. Then, the governor room abnormality detection system 50 according to the present invention determines an abnormality in the governor room 10 based on the room sound collected by the microphone 18.

  As shown in FIG. 1, an analysis unit 21 for acoustically analyzing the room sound of the governor room 10 collected by the microphone 18 is provided in the room of the governor room 10. The analysis unit 21 is connected to the microphone 18 via the interface 22 and amplifies the room sound collected by the microphone 18, extracts a specific frequency component by the filter circuit, removes noise by averaging processing, A / D conversion processing, FFT (Fast Fourier Transform) processing, octave analysis, etc. are performed. 7 and 8 are the waveforms of the acoustic signals input from the microphone 18 to the analysis unit 21, and the lower stages are the frequency characteristics of the sound pressure level obtained by performing FFT processing on the acoustic signals. It is a graph (frequency spectrum) to represent. FIG. 5 is a graph showing the frequency characteristics of the sound pressure level obtained by octave analysis.

  The on-site monitoring device 20 includes an arithmetic processing unit 25 and a data storage unit 26 (corresponding to the “sound source data storage unit” of the present invention), and the data storage unit 26 includes an abnormal sound detection program PG1, which will be described later, and hunting detection. Various data including a program PG2 and a flow rate conversion database DB1 (corresponding to "flow rate conversion means" of the present invention) are stored.

  As conceptually shown in FIG. 6 (A), the flow rate conversion database DB1 has a volume (specifically, sound pressure) of a specific frequency band F1 unique to a gas passing sound generated when gas passes through the governor 11. Level) and the flow rate of the gas flowing through the governor 11 are stored in association with each other. That is, as shown in the graph of FIG. 5, there is a relationship that the sound pressure level increases as the flow rate increases between the flow rate flowing through the governor 11 and the sound pressure level. It is created based on the relationship between the flow rate and the sound pressure level. The specific frequency band F1 unique to the governor 11 is arbitrarily set from a frequency range in which the relationship between the flow rate and the sound pressure level is satisfied, for example, a frequency range of 1 [kHz] to 15 [kHz]. In the embodiment, for example, a frequency band centered on 12.5 [kHz] is set (see FIG. 5).

  Here, the flow rate conversion database DB1 (a calibration curve indicated by a solid line in FIG. 6A) stored in advance in the data storage unit 26 is created by an experiment performed in advance in a specific governor chamber 10. If the flow rate is roughly measured (for example, in three stages of large flow rate, medium flow rate, and small flow rate), this flow rate conversion database DB1 can be directly used for flow rate measurement in the other governor chamber 10. Can be used.

  However, when the flow rate is measured more accurately, it is not appropriate to use the flow rate conversion database DB1 as it is. The reason is that the installation environment of the governor 11 (the location of the governor room 10 and the positional relationship with other sound sources and the microphone 18) varies from one governor room 10 to another. Therefore, in order to measure the flow rate of the governor 11 more accurately, the flow rate conversion database DB1 needs to be corrected according to the installation environment of the governor 11 in the governor chamber 10. For this purpose, the on-site monitoring device 20 includes a data correction unit 27 (see FIG. 2A). The data correction unit 27 corrects the flow rate conversion database DB1 based on the correction data DT1 created or updated at the initial setting of the governor room abnormality detection system 50 and at the periodic inspection of the governor room 10 (for example, in FIG. 6A). The calibration curve shown can be adjusted (zero / span adjustment).

  The correction of the flow rate conversion database DB1 is performed as follows. That is, when the gas is not flowed to the governor 11 installed in the governor chamber 10 and when the gas is actually flowed, the room sound is acquired by the microphone 18 installed in the governor chamber 10 and the acoustic analysis is performed. The sound pressure level of the specific specific frequency band F1 is measured, and the actual flow rate in the governor 11 is measured. The flow rate conversion database DB1 is corrected using the difference between the actually measured flow rate and the flow rate detected based on the actually measured sound pressure level and the flow rate conversion database DB1 as the correction data DT1. In FIG. 6A, the corrected flow rate conversion database DB1 is shown as a broken calibration curve.

  Further, in the corrected flow rate conversion database DB1, the sound pressure level corresponding to the flow rate “0” is stored in the data storage unit 26 as the reference allowable value Lv1 for the specific frequency band F1 unique to the governor 11.

  The data storage unit 26 stores a specific specific frequency band F1, F2, F3 and a sound pressure level reference allowable value Lv1 for each specific frequency band F1, F2, F3 for each sound source that may exist in the governor room 10. , Lv2, Lv3 are stored. The specific frequency band F1 unique to the governor 11 and the reference allowable value Lv1 for the specific frequency band F1 are as described above.

  As the specific frequency band F2 specific to the sound (bubbling sound) generated from the water sealer 14, as shown in the frequency spectrum of FIG. 7, a frequency centered at 55 [Hz] at which a peak peculiar to the bubbling sound appears. A band and a frequency band centered on 625 [Hz] are set, and a reference allowable value Lv2 smaller than the peak value peculiar to the bubbling sound is set for the specific frequency band F2.

  Further, as the specific frequency band F3 specific to the human vocal cord as a sound source, as shown in the frequency spectrum of FIG. 8, a frequency band of 100 [Hz] to 1 [kHz] in which a peak peculiar to the human voice appears. Is set, and the reference allowable value Lv3 smaller than the peak value peculiar to human voice is set for the specific frequency band F3.

  By the way, the water in the water sealer 14 may decrease due to natural evaporation or bubbling, or conversely, may increase due to water intrusion from the discharge pipe 17, and is generated from the water sealer 14 due to this water level change. The frequency at which a peak peculiar to a bubbling sound (see FIG. 7) appears can change. Therefore, the specific frequency band F2 unique to the water sealer 14 is set to a bandwidth that can detect the sound (bubbling sound) of the water sealer 14 even when the water level fluctuation of the water sealer 14 occurs.

  Specifically, the water sealer 14 is set to a plurality of water levels including an appropriate water level, and an acoustic analysis of the bubbling sound is performed, so that all appearance frequencies of peaks peculiar to the bubbling sound generated at each set water level are included. The bandwidth of the specific frequency band F2 is set (see FIG. 6B).

  Here, the specific frequency band F2 preliminarily stored in the data storage unit 26 is, for example, created by an experiment conducted at a manufacturer's experimental facility, and this default specific frequency band F2 (FIG. 6B Even if it is used as it is, the bubbling sound of the water sealer 14 installed in the governor chamber 10 can be detected almost satisfactorily.

  However, the sound collection environment of the microphone 18 in the governor room 10 may differ greatly from the experimental facility. In addition, the installation environment of the water sealer 14 (location of the governor room 10 and the positional relationship with other sound sources and the microphone 18) is different for each governor room 10. Therefore, in order to more reliably detect the sound of the water sealer 14 in the governor chamber 10, it is necessary to correct the default specific frequency band F2 according to the installation environment of the water sealer 14 in the governor chamber 10. For this purpose, the on-site monitoring device 20 includes a data correction unit 28 (see FIG. 2B) for correcting the specific frequency band F2.

  The correction of the specific frequency band F2 by the data correction unit 28 is performed as follows. That is, at the time of initial setting of the governor room abnormality detection system 50, the water seal 14 installed in the governor room 10 is set to a plurality of water levels including an appropriate water level and bubbled, and acoustic analysis of room sound is performed, and at each set water level. The specific frequency band F2 is corrected using the appearance frequency of the peak peculiar to the generated bubbling sound as correction data (a graph indicated by a broken line in FIG. 6B). For example, in the correction using the correction data shown in FIG. 6B, correction for narrowing the bandwidth of the default specific frequency band F2 is performed.

  The configuration of the governor room abnormality detection system 50 is as described above. Next, the operation of the governor room abnormality detection system 50 will be described with reference to the flowcharts of FIGS. The on-site monitoring device 20 executes the abnormal sound detection program PG1 shown in FIG. 3 at a predetermined cycle.

  That is, the room sound of the governor room 10 collected by the microphone 18 is acquired (S11), and the analysis unit 21 performs acoustic analysis (S12). Next, the flow rate of the governor 11 is calculated based on the sound pressure level of the specific frequency band F1 unique to the governor 11 and the flow rate conversion database DB1 (S13). Step S13 corresponds to the “flow rate detecting means” of the present invention.

  Next, it is determined whether or not the flow rate of the governor 11 is “0” (S14). When the flow rate of the governor 11 is not “0” (Yes in S14), in other words, the sound pressure level of the specific frequency band F1 specific to the governor 11 included in the room sound is set for the specific frequency band F1. If the determined reference allowable value Lv1 is not exceeded, the process proceeds to step S16. On the other hand, when the flow rate of the governor 11 is “0” (No in S14), in other words, when the sound pressure level of the specific frequency band F1 unique to the governor 11 becomes smaller than the reference allowable value Lv1. The abnormality detection flag fg1 is turned on (S15) because there is a possibility that the gas supply to the regional block may have been stopped by the operation of the emergency shut-off device 13.

  Next, it is determined whether the bubbling sound of the water sealer 14 is included in the room sound (S16). That is, it is determined whether or not the sound pressure level of the specific frequency band F2 specific to the water sealer 14 exceeds the reference allowable value Lv2 (see FIG. 7) set for the specific frequency band F2. . If the reference allowable value Lv2 is not exceeded (No in S16), the process proceeds to step S18. On the other hand, if the reference allowable value Lv2 is exceeded (Yes in S16), the secondary pressure of the governor 11 may be abnormally increased or the water sealer 14 may have insufficient water. The abnormality detection flag fg2 is turned on (S17).

  Next, it is determined whether or not a human voice is included in the room sound (S18). That is, it is determined whether or not the sound pressure level of the specific frequency band F3 specific to the human vocal cord has exceeded a reference allowable value Lv3 (see FIG. 8) set for the specific frequency band F3. If the reference allowable value Lv3 is not exceeded (No in S18), the governor room 10 is assumed to be unattended and the process proceeds to step S20. On the other hand, if the sound pressure level in the specific frequency band F3 exceeds the reference allowable value Lv3 (Yes in S18), the abnormality detection flag fg3 is determined that there is a possibility of entering the governor room 10 without permission. Is turned on (S19).

  Next, it is determined whether any one of the abnormality detection flags fg1, fg2, and fg3 is on (S20). If all the abnormality detection flags fg1, fg2, and fg3 are off (No in S20). In this case, the abnormal sound detection program PG1 is exited. On the other hand, if any one of the abnormality detection flags fg1, fg2, and fg3 is on (Yes in S20), an abnormality notification that can specify the sound source in which the abnormal sound is detected is performed (S21). ), The abnormal sound detection program PG1 is exited. Note that steps S14, S16, and S18 in the abnormal sound detection program PG1 correspond to the “reference comparison determination unit” of the present invention. Step S21 corresponds to “abnormality notification means” of the present invention.

  The local monitoring apparatus 20 executes a hunting detection program PG2 shown in FIG. 4 separately from the abnormal sound detection program PG1 described above. In the hunting detection program PG2, first, the flow rate of the governor 11 is stored over a predetermined period (S31), and whether the flow rate has fluctuated beyond a preset fluctuation range (S32), or its fluctuation cycle is preset. It is determined whether the allowable range has been exceeded (S33) or whether the variation has continued beyond a preset number of times (S34). If all these conditions are met (Yes in S32 to S34), it is determined that an abnormal flow rate fluctuation (hunting) has occurred in the governor 11, and an abnormality notification (S35) is performed.

  The abnormality notification (S21, S35) in each program PG1, PG2 may be performed by a not-shown alarm (notification lamp, notification buzzer, etc.) provided in the on-site monitoring device 20 (governor room 10), or the governor room 10 A mobile terminal carried by a monitoring center or a manager in charge of remote monitoring and a communication device 29 (see FIG. 1) provided in the local monitoring device 20 is connected by a communication line, and the monitoring center or mobile terminal Then, the abnormality may be notified (for example, mail reception). When the abnormality notification is performed at the monitoring center or the mobile terminal, the occurrence of the abnormality can be quickly grasped in real time.

  Thus, according to the present embodiment, the volume (sound pressure level) of the room sound of at least one sound source among the plurality of sound sources (governor 11, water seal 14, human vocal cord) of the governor chamber 10 is Since the abnormality is notified when the preset reference allowable values Lv1, Lv2, and Lv3 are exceeded with respect to the specific frequency bands F1, F2, and F3 specific to the sound source, it is accurately performed without requiring the skill of an inspector. An abnormality in the governor chamber 10 can be detected. In addition, it is possible to identify a sound source that generates an abnormal sound from among a plurality of sound sources (governor 11, water seal 14 and human vocal cords), and it is possible to quickly cope with the abnormality. In addition, by notifying the monitoring center that remotely monitors the governor room 10 and the mobile terminal possessed by the manager, it is not necessary for the inspector to actually go to the governor room to inspect the abnormal sound. It becomes possible to monitor the presence or absence of abnormality in real time.

  Further, since the flow rate conversion database DB1 is corrected according to the installation environment of the governor 11 in the governor room 10, it is possible to more accurately detect abnormalities in the flow rate and flow rate (gas stop and hunting) of the governor 11. Become.

  Further, since the specific frequency band F2 unique to the water seal 14 is corrected according to the installation environment of the water seal 14 in the governor chamber 10, it is possible to detect the abnormal sound of the water seal 14 more accurately. It becomes.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) In the above embodiment, only one microphone 18 is installed in the governor room 10, but in order to remove noise irrelevant to the sound emitted from the sound source in the governor room 10 in the acoustic analysis process, A plurality of microphones 18 may be provided.

  (2) In the above embodiment, the entry into the governor chamber 10 is detected by detecting a voice uttered from a human vocal cord. However, the opening / closing sound of the entrance / exit door of the governor chamber 10 and walking in the governor chamber 10 are detected. When the footstep sound of the time is detected using the microphone 18 and the analysis unit 21, the entry into the governor chamber 10 may be detected. In addition, as shown in FIG. 10, sounds that do not occur in the normal governor room 10 such as human voice, door opening / closing sound, footsteps, lightning sound, etc. are collectively displayed without specifying a sound source. It may be detected as “sound” and the abnormality may be reported.

  (3) In the embodiment, the abnormality is detected by determining the level of the sound pressure level as the volume of the room sound of the governor chamber 10, but it is possible to convert the unit between the sound pressure level and the sound pressure level. An abnormality may be detected by determining the magnitude of another physical quantity (for example, sound pressure).

  (4) In the above embodiment, the abnormal fluctuation (hunting) of the flow rate in the governor 11 is detected based on the calculation result of the flow rate (see FIG. 4), but the sound pressure level of the specific frequency band F1 unique to the governor 11 You may detect by monitoring the fluctuation | variation of. That is, when the sound pressure level fluctuates beyond a preset fluctuation range, the fluctuation period exceeds a preset allowable range, and the fluctuation continues beyond a preset number of times, It may be determined that an abnormal flow rate variation (hunting) has occurred.

  (5) Also, when hunting occurs, an amplitude-modulated sound whose amplitude changes with time is generated as shown in FIG. 9, and therefore, by detecting the undulation of the envelope H in the waveform of the amplitude-modulated sound, hunting is performed. You may determine the presence or absence of.

  (6) Although the analysis unit 21 is installed in the governor chamber 10 in the above embodiment, it may be installed outside the governor chamber 10.

10 Governor room 11 Governor 14 Water seal 15 Container 16 Branch pipe 18 Microphone 20 On-site monitoring device 26 Data storage unit (sound source data storage unit)
27 Data Correction Unit 50 Governor Abnormality Detection System DB1 Flow Rate Conversion Database (Flow Rate Conversion Means)
DT1 correction data F1, F2, F3 Specific frequency band Lv1, Lv2, Lv3 Reference tolerance

Claims (10)

Corresponding to a plurality of sound sources including the governor in the governor room, a sound volume reference tolerance is set for each specific frequency band specific to each sound source,
Obtaining the room sound of the governor room, and for each specific frequency band of each sound source, determining whether the volume of the room sound exceeds the reference allowable value,
A governor room abnormality detection method, wherein abnormality notification is performed when the volume of the room sound of at least one sound source of the plurality of sound sources exceeds the reference allowable value. Create a flow rate conversion means that associates the volume of the specific frequency band unique to the governor with the flow rate flowing through the governor,
The flow rate flowing through the governor is detected by the flow rate conversion means based on the volume of the room sound in the specific frequency band of the governor, and when the flow rate exceeds a predetermined reference flow rate, the volume level of the governor is 2. The governor room abnormality detection method according to claim 1, wherein abnormality notification is performed when a reference allowable value is exceeded.   Measure the volume of the specific frequency band specific to the governor, measure the flow rate actually flowing to the governor with respect to the volume, measure the flow rate, the volume of the specific frequency band of the governor, and the flow rate. 3. The governor room abnormality detection method according to claim 2, wherein correction data is generated from a difference between the flow rate detected based on the conversion means and the flow rate conversion means is corrected using the correction data. One of the plurality of sound sources is a human vocal cord,
The abnormality detection is performed according to any one of claims 1 to 3, wherein abnormality detection is performed when a volume of the specific frequency band of the vocal cords included in a room sound of the governor room becomes larger than the reference allowable value. The governor room abnormality detection method of description. A microphone for acquiring a room sound of a governor room capable of accommodating a plurality of sound sources including the governor;
Corresponding to said plurality of sound sources, and the with storing a plurality of unique specific frequency band to each sound source, a standards tolerance volume set in advance for each of the specific frequency band stores plural sound source data storage unit,
Reference comparison determination means for acquiring room sound of the governor room through the microphone and determining whether the volume of the room sound for each specific frequency band stored in the sound source data storage unit exceeds the reference allowable value. When,
When at least one of the volume of the room acoustics of the specific frequency band among the plurality of specific frequency bands was beyond said reference allowable value, characterized by comprising an abnormality informing means for reporting abnormal Governor indoor abnormality detection system. A flow rate conversion means that correlates the volume of the specific frequency band specific to the governor and the flow rate of the governor;
A flow rate detecting means for detecting a flow rate flowing through the governor by the flow rate conversion means based on a volume of a room sound in the specific frequency band of the governor;
6. The governor room abnormality according to claim 5, wherein the reference comparison determination means determines that the volume of the governor exceeds the reference allowable value when the flow rate exceeds a predetermined reference flow rate. Detection system. As one of the plurality of sound sources, the tip of the branch pipe branched from the gas supply path is disposed in the water stored in the container, and the release of gas into the container is normally prohibited by the water pressure in the container. On the other hand, when the gas pressure in the gas supply path exceeds the water pressure, a water seal is provided that discharges gas from the branch pipe into the water,
The governor room abnormality detection system according to claim 5 or 6, wherein the microphone can detect a sound generated when gas is released into the water.   The volume of the specific frequency band specific to the governor fluctuates beyond a preset fluctuation range, the fluctuation period exceeds a preset allowable range, and the fluctuation exceeds a preset number of times. The governor room abnormality detection system according to any one of claims 5 to 7, further comprising hunting detection means for determining whether or not the signal is continuous.   The governor room abnormality detection according to any one of claims 5 to 8, further comprising a communication device that transmits a determination result by the reference comparison determination unit to the abnormality notification unit via a communication network. system.   When the human vocal cord is set as one of the plurality of sound sources and the volume of the room sound in the specific frequency band of the vocal cord exceeds the reference allowable value, the abnormality notifying unit performs abnormality notification. The governor room abnormality detection system according to any one of claims 5 to 9.