Abnormal sound diagnosis system and abnormal sound diagnosis method for elevator

Abstract

The invention relates to an abnormal sound diagnosis system and an abnormal sound diagnosis method of an elevator. In an abnormal sound diagnosis system of an elevator according to an embodiment, when it is determined that an abnormal sound is generated based on sound pressure measurement data generated by measurement of each sound sensor, a time difference between times at which a sound pressure peak value of each sound pressure measurement data is generated is calculated as a measurement time difference. On the basis of the measurement time difference, the generation orientation of the abnormal sound relative to a reference point defined by each sound sensor is calculated as a measurement generation orientation, and an abnormal sound generation device for generating the abnormal sound is determined on the basis of the measurement generation orientation and device configuration data at the lifting position of the passenger car where the sound pressure peak value is generated.

Description

Technical Field

[0001] The embodiments relate to an abnormal sound diagnosis system and an abnormal sound diagnosis method for an elevator. Background Art

[0002] The abnormal sound diagnosis of the elevator is performed by comparing the sound pressure data during normal operation with the sound pressure data during diagnosis. For example, there is a known abnormal sound diagnosis system that determines the lifting position where the abnormal sound is generated based on the image captured during the lifting of the passenger car, the measured sound pressure data, and the lifting position of the passenger car. Alternatively, for example, there is also a known abnormal sound diagnosis system that determines the lifting position where the abnormal sound is generated based on the orientation of multiple sound sensors, the sound pressure difference, the lifting position of the passenger car, and the learning database. The processing of such an abnormal sound diagnosis system becomes complicated and may become an expensive system.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 7006864

[0006] Patent Document 2: Japanese Patent Application Publication No. 2022-025828 Summary of the invention

[0007] Problems to be solved by the invention

[0008] An object of the embodiment is to provide a simple and inexpensive abnormal sound diagnostic system and abnormal sound diagnostic method for an elevator.

[0009] Technical solutions to solve problems

[0010] The abnormal sound diagnostic system of an elevator in an embodiment comprises: two or more sound sensors, which are arranged on the upper surface of a passenger car and measure the sound generated during the lifting and lowering of the passenger car; a first abnormal sound determination unit, which determines whether an abnormal sound has occurred based on sound pressure measurement data produced by measurements of each sound sensor; a first time difference calculation unit, which, when it is determined by the first abnormal sound determination unit that an abnormal sound has occurred, calculates the time difference between the times when the sound pressure peaks of each sound pressure measurement data are generated as the measurement time difference; an orientation calculation unit, which calculates the generation orientation of the abnormal sound relative to a reference point defined by each of the sound sensors as the measured generation orientation based on the measured time difference; and a device determination unit, which determines the abnormal sound generating device that generates the abnormal sound based on the measured generation orientation and the device configuration data at the lifting and lowering position of the passenger car where the sound pressure peak is generated.

[0011] The abnormal sound diagnosis method of an elevator in an embodiment includes: a step of measuring the sound generated during the lifting and lowering of the passenger car by means of two or more sound sensors arranged on the upper surface of the passenger car; a step of determining whether an abnormal sound has been generated based on sound pressure measurement data produced by measurements of each sound sensor; a step of calculating, when it is determined that an abnormal sound has been generated, the time difference between the times when the sound pressure peaks of each sound pressure measurement data are generated as the measurement time difference; a step of calculating, based on the measurement time difference, the generation direction of the abnormal sound relative to a reference point defined by each sound sensor as the measurement generation direction; and a step of determining an abnormal sound generating device that generates the abnormal sound based on the measured generation direction and the device configuration data at the lifting and lowering position of the passenger car where the sound pressure peak is generated. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram showing the elevator apparatus according to the first embodiment.

[0013] Figure 2 is shown as viewed from above Figure 1 A schematic diagram of the equipment configuration when the passenger car is in use.

[0014] Figure 3 This is a block diagram showing the abnormal sound diagnostic system for an elevator according to the first embodiment.

[0015] Figure 4 (a) is used to illustrate Figure 3 A schematic diagram of the determination process performed by the first abnormal sound determination unit shown in FIG. Figure 4 (b) is used to illustrate the sound from the sound source to Figure 2 Schematic diagram of the arrival time of the sound sensor shown, Figure 4 (c) is used to illustrate Figure 3 FIG. 2 is a schematic diagram of a calculation process of a measured time difference performed by the first time difference calculation unit shown in FIG.

[0016] Figure 5 (a) is used to illustrate Figure 3 A schematic diagram of the determination process performed by the second abnormal sound determination unit shown in FIG. Figure 5 (b) is used to illustrate Figure 3 FIG. 2 is a schematic diagram of a calculation process of a measured time difference performed by the second time difference calculation unit shown in FIG.

[0017] Figure 6 is shown as viewed from above Figure 1 This is a schematic diagram of the equipment configuration when the elevator car is in use, and is a diagram for explaining the reference time difference.

[0018] Figure 7 (a) is used to illustrate Figure 3The table of reference time differences used by the direction calculation unit shown in FIG. Figure 7 (b) is used to illustrate Figure 3 FIG. 2 is a graph showing a calculation process of a generated direction performed by the direction calculation unit.

[0019] Figure 8 yes Figure 3 An example of device configuration data used by the device identification unit shown.

[0020] Fig. 9 This is a flowchart showing the abnormal sound diagnostic method for an elevator according to the first embodiment.

[0021] Fig.10 This is a block diagram showing an abnormal sound diagnostic system for an elevator according to the second embodiment. DETAILED DESCRIPTION

[0022] Hereinafter, an abnormal sound diagnostic system and an abnormal sound diagnostic method for an elevator according to the present embodiment will be described with reference to the drawings.

[0023] (First embodiment)

[0024] like Figure 1 As shown, the elevator car 1 of this embodiment is connected to a counterweight (not shown) through a main rope. The main rope is wound around a traction sheave connected to a traction machine (not shown). The traction machine winds up the main rope, and the car 1 and the counterweight are raised and lowered. The raising and lowering of the car 1 is guided by a pair of guide rails 3A and 3B provided in the lifting passage 2. Guide rollers 4A and 4B rolling on the guide rails 3A and 3B are provided on the upper and lower parts of the car 1. Figure 2 As shown in FIG. 1 , sheaves 5A and 5B around which a main rope is wound are provided on the upper surface of the car 1. In addition, a first device 6A, a second device 6B, and a third device 6C are provided on the upper surface of the car 1.

[0025] The elevator abnormal sound diagnostic system 10 of the present embodiment is a system for diagnosing whether an abnormal sound is generated during the ascending and descending of the passenger car 1. The abnormal sound diagnostic system 10 will be described below.

[0026] like Figure 2 as well as Figure 3As shown, the abnormal sound diagnosis system 10 has two or more sound sensors 11 to 14, a diagnostic device 20, a sound database 15, a device configuration database 16, and a display unit 17. The sound sensors 11 to 14 and the diagnostic device 20 can be set on the upper surface of the passenger car 1. The sound database 15 and the device configuration database 16 can be set in the control device of the elevator or outside the control device. Alternatively, the databases 15 and 16 can be set in a cloud server. The display unit 17 can be set in the monitoring room of the elevator. In this embodiment, as shown in FIG. Figure 2 As shown, as an example, an abnormal sound diagnosis system 10 including four sound sensors 11 to 14 will be described. The four sound sensors 11 to 14 are a first sound sensor 11 , a second sound sensor 12 , a third sound sensor 13 , and a fourth sound sensor 14 .

[0027] The sound sensors 11 to 14 are installed on the upper surface of the passenger car 1. The sound sensors 11 to 14 measure the sound generated during the lifting and lowering of the passenger car 1. The sound sensors 11 to 14 may be microphones capable of measuring sounds of 20 Hz to 20 kHz. The sound sensors 11 to 14 may be connected to the sound pressure data generating unit 22 described later by wire or wirelessly. Sound signals are sent from the sound sensors 11 to 14 to the sound pressure data generating unit 22. The sound sensors 11 to 14 may be fixed to the upper surface of the passenger car 1. The sound sensors 11 to 14 may be as follows: Figure 2 As shown, when viewed from above, they are arranged at the central part of the upper beam (not shown) located on the upper surface of the passenger car 1, and can also be arranged at the four corners of the upper surface of the passenger car 1. When the sound sensors 11 to 14 have directivity, the directions of the sound sensors 11 to 14 are arbitrary, and the directions of the sound sensors 11 to 14 can be fixed.

[0028] The diagnostic device 20 performs various processes of abnormal sound diagnosis of the present embodiment. The diagnostic device 20 may include a communication unit 21, a sound pressure data generating unit 22, a first abnormal sound determining unit 23, a first time difference calculating unit 24, a spectrogram generating unit 25, a second abnormal sound determining unit 26, a second time difference calculating unit 27, a direction calculating unit 28, a device determining unit 29, a car position acquiring unit 30, a device replacement determining unit 31, and an information recording unit 32.

[0029] The communication unit 21 is configured to be able to communicate with the above-mentioned voice database 15, device configuration database 16, and display unit 17. The communication unit 21 can communicate with each database 15, 16, and display unit 17 via a network.

[0030] The sound pressure data generating unit 22 generates sound pressure measurement data based on the sounds measured by the sound sensors 11 to 14. The sound pressure measurement data is data indicating the relationship between the time when the car 1 starts to rise and fall and the sound pressure. Figure 4 (a) and (b) schematically show the sound pressure measurement data. The sound pressure data generating unit 22 generates the sound pressure measurement data for each of the acoustic sensors 11 to 14. Therefore, in the present embodiment, four sound pressure measurement data are generated.

[0031] The first abnormal sound determination unit 23 determines whether an abnormal sound has occurred based on each sound pressure measurement data. For example, the first abnormal sound determination unit 23 can determine whether an abnormal sound has occurred by comparing the sound pressure peak value of the pre-stored sound pressure reference data with the sound pressure peak value of the sound pressure measurement data. Each sound pressure measurement data is compared with the corresponding sound pressure reference data. That is, the sound pressure measurement data and the sound pressure reference data are respectively associated with the corresponding sound sensors 11 to 14.

[0032] More specifically, the first abnormal sound determination unit 23 obtains each sound pressure reference data stored in the sound database 15 described later via the communication unit 21. Each sound pressure reference data is compared with the corresponding sound pressure measurement data. Figure 4 As shown in (a), when the sound pressure peak difference ΔP obtained by subtracting the sound pressure peak of the corresponding sound pressure reference data P0 from the sound pressure peak of the sound pressure measurement data P1 is greater than a predetermined first threshold, it can be determined that an abnormal sound has occurred. When the sound pressure peak difference ΔP is less than the first threshold, it can be determined that no abnormal sound has occurred. The sound pressure peak is the highest value of the sound pressure in the sound pressure measurement data. Figure 4 (a) representatively illustrates the sound pressure measurement data P1 obtained from the first acoustic sensor 11 .

[0033] As described above, in the present embodiment, four sound pressure measurement data are generated. The first abnormal sound determination unit 23 compares each sound pressure measurement data with the corresponding sound pressure reference data. When the sound pressure peak difference ΔP of at least one sound pressure measurement data is greater than the first threshold value described above, the first abnormal sound determination unit 23 may determine that an abnormal sound has occurred.

[0034] When the first abnormal sound determination unit 23 determines that an abnormal sound has been generated, the first time difference calculation unit 24 calculates the time difference between the times when the sound pressure peaks of each sound pressure measurement data are generated as the measurement time difference. The measurement time difference is the time difference when the abnormal sound generated by the abnormal sound generating device described later reaches each sound sensor 11 to 14. Figure 4As shown in (b), the time at which the abnormal sound generated by the abnormal sound generating device reaches each sound sensor 11 to 14 may be different. Therefore, in the abnormal sound diagnostic system 10 of this embodiment, the time difference between the abnormal sound reaching each sound sensor 11 to 14 is used to determine the direction of the abnormal sound generation.

[0035] For example, the first time difference calculation unit 24 may calculate the difference between the time when the sound pressure peak corresponding to the sound pressure measurement data of the first sound sensor 11 is generated and the time when the sound pressure peak corresponding to the sound pressure measurement data of the other sound sensors 12 to 14 is generated. Figure 4 As shown in (c), the first time difference calculation unit 24 calculates the measurement time difference Δt between the time t2 when the sound pressure peak corresponding to the second acoustic sensor 12 is generated and the time t1 when the sound pressure peak corresponding to the first acoustic sensor 11 is generated. 21i . Figure 4 (c) representatively illustrates the sound pressure measurement data P1 obtained from the first sound sensor 11 and the sound pressure measurement data P2 obtained from the second sound sensor 12. Similarly, the first time difference calculation unit 24 calculates the measurement time difference Δt between the time t3 corresponding to the sound pressure peak of the third sound sensor 13 and the time t1. 31i In addition, the first time difference calculation unit 24 calculates the measurement time difference Δt between the time t4 at which the sound pressure peak corresponding to the fourth acoustic sensor 14 occurs and the time t1. 41i .

[0036] The spectrogram generator 25 generates a measured spectrogram based on each sound pressure measurement data generated by the sound pressure data generator 22. The measured spectrogram can also be generated by performing a fast Fourier transform on the sound pressure measurement data. The measured spectrogram is data indicating the relationship between the time when the car 1 starts to rise and fall, the frequency, and the sound pressure. Figure 5 (a) schematically shows the frequency-sound pressure characteristics obtained from the measured sound spectrogram. Figure 5 In (a), the frequency-sound pressure characteristics obtained from the reference spectrogram described later are shown in an overlapping manner. The spectrogram creation unit 25 creates a measured spectrogram for each sound pressure measurement data. Therefore, in this embodiment, four measured spectrograms are created to obtain the frequency-sound pressure characteristics of each. Figure 5 (a) representatively illustrates the frequency-sound pressure characteristics obtained from the measured sound spectrogram obtained from the first sound sensor 11 .

[0037] The spectrogram generator 25 may generate the above-mentioned measured spectrogram when it is determined by the first abnormal sound detector 23 that no abnormal sound is generated. Alternatively, the spectrogram generator 25 may generate the measured spectrogram not only when it is determined by the first abnormal sound detector 23 that no abnormal sound is generated but also when it is determined by the first abnormal sound detector 23 that an abnormal sound is generated.

[0038] When the first abnormal sound determination unit 23 determines that no abnormal sound has been generated, the second abnormal sound determination unit 26 determines whether an abnormal sound has been generated based on the above-mentioned measured sound spectrogram. For example, the second abnormal sound determination unit 26 can determine whether an abnormal sound has been generated by comparing the peak frequency of a pre-stored reference sound spectrogram with the peak frequency of the measured sound spectrogram. The peak frequency of each measured sound spectrogram is compared with the peak frequency of the corresponding reference sound spectrogram. Each measured sound spectrogram is associated with the corresponding sound sensor 11 to 14.

[0039] The second abnormal sound determination unit 26 obtains each reference sound spectrogram stored in the sound database 15 described later via the communication unit 21. The peak frequency of each reference sound spectrogram is compared with the peak frequency of the corresponding measured sound spectrogram. More specifically, Figure 5 As shown in (a), when the absolute value of the peak frequency difference Δf between the peak frequency f1 of the measured spectrogram and the peak frequency f0 of the corresponding reference spectrogram is greater than a predetermined second threshold value, it can be determined that an abnormal sound has occurred. When the absolute value of the peak frequency difference Δf is less than the second threshold value, it can be determined that no abnormal sound has occurred. The peak frequency is the frequency at which the sound pressure peak occurs in the spectrogram.

[0040] As described above, in the present embodiment, four measured sound spectrograms are prepared. The peak frequency of each measured sound spectrogram is compared with the peak frequency of the corresponding reference sound spectrogram by the second abnormal sound detector 26. When the absolute value of the peak frequency difference Δf for at least one measured sound spectrogram is greater than the second threshold value, the second abnormal sound detector 26 may determine that an abnormal sound has occurred.

[0041] When the second abnormal sound determination unit 26 determines that an abnormal sound has been generated, the second time difference calculation unit 27 calculates the time difference between the times when the sound pressure peaks of each measured spectrogram are generated as the measured time difference. The measured time difference calculated by the second time difference calculation unit 27 is the same as the measured time difference calculated by the first time difference calculation unit 24, and is a value used in the direction calculation unit 28 described later.

[0042] For example, the second time difference calculation unit 27 can calculate the difference between the time when the sound pressure peak of the measured sound spectrogram corresponding to the first sound sensor 11 is generated and the time when the sound pressure peak of the measured sound spectrogram corresponding to the other sound sensors 12 to 14 is generated in the same manner as the first time difference calculation unit 24. The sound pressure peak of the measured sound spectrogram corresponding to the other sound sensors 12 to 14 can be the sound pressure peak with respect to the peak frequency f1 obtained from the measured sound spectrogram corresponding to the first sound sensor 11. In this embodiment, as Figure 5 As shown in (b), the second time difference calculation unit 27 calculates the measured time difference Δt between the time t2 when the sound pressure peak value corresponding to the second sound sensor 12 (the sound pressure peak value with respect to the peak frequency f1) is generated and the time t1 when the sound pressure peak value corresponding to the first sound sensor 11 (the sound pressure peak value with respect to the peak frequency f1) is generated. 21i . Figure 5 (b) representatively illustrates the time characteristics of the peak frequency f1 of the first acoustic sensor 11 (the sound pressure measurement data P1 with the peak frequency f1 as a component) and the time characteristics of the peak frequency f1 of the second acoustic sensor 12 (the sound pressure measurement data P2 with the peak frequency f1 as a component). Similarly, the second time difference calculation unit 27 calculates the measurement time difference Δt between the time t3 when the sound pressure peak value corresponding to the third acoustic sensor 13 (the sound pressure peak value with respect to the peak frequency f1) is generated and the time t1 when the sound pressure peak value corresponding to the first acoustic sensor 11 (the sound pressure peak value with respect to the peak frequency f1) is generated. 31i In addition, the second time difference calculation unit 27 calculates the measured time difference Δt between the time t4 when the sound pressure peak value corresponding to the fourth sound sensor 14 (the sound pressure peak value with respect to the peak frequency f1) is generated and the time t1 when the sound pressure peak value corresponding to the first sound sensor 11 (the sound pressure peak value with respect to the peak frequency f1) is generated. 41i .

[0043] The second time difference calculation unit 27 can generate Figure 5 The time when the sound pressure peak occurs is calculated based on the time characteristic of the peak frequency of the measured spectrogram as shown in (b) of FIG. However, the second time difference calculation unit 27 may calculate the time when the sound pressure peak occurs based on the measured spectrogram described above.

[0044] The direction calculation unit 28 calculates the direction of sound generation relative to the reference point SP defined by each sound sensor 11 to 14 as the measured generation direction based on the above-mentioned measurement time difference. When the above-mentioned first abnormal sound determination unit 23 determines that an abnormal sound has been generated, the direction calculation unit 28 uses the measurement time difference calculated by the first time difference calculation unit 24. When the above-mentioned second abnormal sound determination unit 26 determines that an abnormal sound has been generated, the direction calculation unit 28 uses the measurement time difference calculated by the second time difference calculation unit 27.

[0045] In this embodiment, if Figure 6 As shown, the azimuth extending rightward from the reference point SP is set to 0°. The azimuth is set so that the angle advances (increases) counterclockwise from the azimuth of 0°. The reference point SP is the center point of the four acoustic sensors 11 to 14 when viewed from above.

[0046] For example, the direction calculation unit 28 may calculate the measured generation direction using a reference time difference. The reference time difference is the time difference at which the sound generated at a predetermined generation direction relative to the reference point SP reaches each of the sound sensors 11 to 14. Figure 7 An example of the reference time difference is shown in (a) of FIG. 21j Δt is the reference time difference between the first acoustic sensor 11 and the second acoustic sensor 12. 31j is the reference time difference between the first acoustic sensor 11 and the third acoustic sensor 13, Δt 41j This is the reference time difference between the first acoustic sensor 11 and the fourth acoustic sensor 14 .

[0047] like Figure 6 As shown, for the reference time difference, a virtual sound source is arranged at a predetermined angle on a circle C with a predetermined radius, and can be calculated as the time difference when the sound reaches each sound sensor 11 to 14. The virtual sound source can be arranged at a predetermined angle from 0°. Figure 7 (a) shows the reference time difference Δt when the virtual sound source is moved every 10°. 21j , Δt 31j , Δt 41j The reference time difference can be set at an angle less than 10° or at an angle greater than 10°. 21j , Δt 31j , Δt 41j Each reference time difference can be obtained theoretically or experimentally.

[0048] The direction calculation unit 28 can calculate the reference time difference Δt 21j , Δt 31j ,t 41j Difference Δt from the measured time 21i , Δt 31i , Δt 41i The square root of the sum of the squares of the differences (SRSS) is used to calculate the measured direction. For example, the following formula can be used to calculate the measured direction.

[0049]

[0050] In the above formula (1), the measured time difference Δt calculated by the first time difference calculation unit 24 or the second time difference calculation unit 27 is substituted into 21i , Δt 31i , Δt 41i , and substitute the reference time difference Δt at a certain position 21j , Δt 31j , Δt 41j In this way, I in the direction is calculated. By substituting the reference time difference for each direction and executing the calculation of formula (1), I is calculated for each direction. The direction at which I becomes the smallest is the measurement generation direction. Figure 7 (b) shows an example of such calculation. Figure 7 The horizontal axis of (b) is the direction and the vertical axis is I. Figure 7 As can be seen from (b), there is a direction where I becomes the smallest, and this direction is the measured direction.

[0051] The device identification unit 29 identifies the abnormal sound generating device that generates the abnormal sound based on the above-mentioned measured generation direction and the device configuration data. The device configuration data used by the device identification unit 29 is the device configuration data at the lifting position of the passenger car 1 that generates the sound pressure peak of the above-mentioned sound pressure measurement data or the sound pressure peak of the above-mentioned measured sound spectrogram. The device identification unit 29 identifies the device configuration data at the lifting position of the passenger car 1 that generates the sound pressure peak based on a plurality of device configuration data pre-stored for each lifting position of the passenger car 1.

[0052] The control device (not shown) for controlling the lifting operation of the passenger car 1 has lifting position data indicating the relationship between the lifting position and time of the passenger car 1. When the lifting position data is used, the lifting position of the passenger car 1 at the time when the sound pressure peak occurs can be determined. At this time, there are multiple sound pressure peaks corresponding to each sound sensor 11 to 14, so the lifting position of the passenger car 1 can be determined using the average value of the time of each sound pressure peak, or the lifting position of the passenger car 1 can be determined using the time of the maximum sound pressure peak. The lifting position of the passenger car 1 can be obtained by the car position acquisition unit 30 described later. The device determination unit 29 obtains the device configuration data at the lifting position closest to the lifting position of the passenger car 1 at the time when the sound pressure peak occurs from the multiple device configuration data stored in the device configuration database 16 described later.

[0053] Device configuration data may have, for example, Figure 8 The data structure shown. Figure 8The device configuration data shown is data at a certain lifting position. The orientation relative to the reference point SP is associated with each device. The device identification unit 29 identifies the device located at the orientation closest to the measured generation orientation as the abnormal sound generation device. In the case where multiple devices are located at positions with equal angles from the measured generation orientation, the multiple devices can be identified as abnormal sound generation devices.

[0054] The equipment configuration data includes equipment installed on the upper surface of the passenger car 1 and equipment installed in the lifting passage 2. The equipment configuration data includes equipment that may produce abnormal sounds. Examples of such equipment include the guide rails 3A, 3B, guide rollers 4A, 4B, pulleys 5A, 5B, the first equipment 6A, the second equipment 6B, the third equipment 6C, the traction machine, and the traction wheel, but are not limited thereto. The equipment that produces abnormal sounds is determined from among these equipment. Figure 8 , the positions of the first device 6A, the second device 6B, and the third device 6C are representatively shown.

[0055] The car position acquisition unit 30 acquires the lifting position data of the car 1 from a control device that controls the lifting operation of the car 1. The acquired lifting position data of the car 1 is used in the device identification unit 29 described above.

[0056] The device replacement determination unit 31 determines whether the abnormal sound generating device determined by the above-mentioned device determination unit 29 should be replaced. The device replacement determination unit 31 can determine whether the abnormal sound generating device should be replaced based on the size of the sound pressure of the abnormal sound generated from the abnormal sound generating device or the size of the shift in the peak frequency of the abnormal sound. In the case where the above-mentioned first abnormal sound determination unit 23 determines that an abnormal sound has been generated, the device replacement determination unit 31 can determine that the abnormal sound generating device should be replaced when the above-mentioned sound pressure peak difference ΔP is greater than the predetermined third threshold. The third threshold may be greater than the above-mentioned first threshold. Alternatively, in the case where the above-mentioned second abnormal sound determination unit 26 determines that an abnormal sound has been generated, the device replacement determination unit 31 can determine that the abnormal sound generating device should be replaced when the above-mentioned peak frequency difference Δf is greater than the predetermined fourth threshold. The fourth threshold is greater than the above-mentioned second threshold.

[0057] The information recording unit 32 may record the information of the abnormal sound generating device determined by the device determining unit 29 and the replacement determination result of the abnormal sound generating device determined by the device replacement determination unit 31, when it is determined that an abnormal sound is generated and it is determined that the abnormal sound generating device should not be replaced. The information of the abnormal sound generating device and the replacement determination result may be recorded in a database (not shown) outside the diagnostic device 20, or in a memory (not shown) within the diagnostic device 20. In addition, when it is determined by the first abnormal sound determination unit 23 and the second abnormal sound determination unit 26 that no abnormal sound is generated, the information recording unit 32 may record each sound pressure measurement data produced by the sound pressure data producing unit 22 and each measurement sound spectrogram produced by the sound spectrogram producing unit 25 in the sound database 15.

[0058] The sound database 15 stores the above-mentioned multiple sound pressure reference data. The sound pressure reference data may be normal sound pressure data. For example, the sound pressure reference data may be sound pressure data in a mode in which the passenger car 1 is lifted and lowered from the lowermost floor to the uppermost floor without stopping. The multiple sound pressure reference data stored in the sound database 15 correspond to each sound pressure measurement data. Moreover, the sound database 15 may store multiple sound pressure reference data in a manner corresponding to any lifting mode of the passenger car 1. In this case, the sound pressure reference data of the lifting mode corresponding to the lifting mode of the passenger car 1 during diagnosis may be used in the first abnormal sound determination unit 23. The multiple sound pressure reference data stored in the sound database 15 may correspond to multiple lifting modes and correspond to each sound sensor 11 to 14.

[0059] Furthermore, the sound database 15 may store various sound pressure measurement data generated when it was determined that no abnormal sound was generated until the last diagnosis as sound pressure reference data. These sound pressure reference data may be used in comparison with the sound pressure measurement data of the first abnormal sound determination unit 23. In this case, it is possible to confirm changes in the sound pressure data relative to the last diagnosis, such as whether the sound pressure tends to increase.

[0060] In addition, the sound database 15 stores the above-mentioned multiple reference sound spectrograms. The reference sound spectrogram may be a normal sound spectrogram. For example, the reference sound spectrogram may be a sound spectrogram in a mode in which the passenger car 1 is lifted and lowered from the lowermost floor to the uppermost floor without stopping. The multiple reference sound spectrograms stored in the sound database 15 correspond to each measured sound spectrogram. Moreover, the sound database 15 may store multiple reference sound spectrograms in a manner corresponding to any lifting mode of the passenger car 1. In this case, the reference sound spectrogram of the lifting mode corresponding to the lifting mode of the passenger car 1 during diagnosis may be used in the second abnormal sound determination unit 26. The multiple reference sound spectrograms stored in the sound database 15 may correspond to multiple lifting modes and correspond to each sound sensor 11 to 14.

[0061] Furthermore, the sound database 15 may store each measured sound spectrogram produced when it was determined that no abnormal sound was generated until the last diagnosis as a reference sound spectrogram. These reference sound spectrograms are used in comparison with the measured sound spectrogram of the second abnormal sound determination unit 26. In this case, it is possible to confirm changes in the sound spectrogram relative to the last diagnosis, such as whether the frequency tends to increase.

[0062] The equipment configuration database 16 stores the above-mentioned multiple equipment configuration data. The equipment configuration database 16 may also store equipment configuration data at multiple lifting positions. The equipment configuration data at the uppermost position may include equipment such as a traction machine and a traction wheel (not shown) disposed at the upper part of the lifting passage 2.

[0063] The display unit 17 can display the abnormal sound generating device identified by the device identifying unit 29. The display unit 17 can obtain information about the abnormal sound generating device from the device identifying unit 29 via the communication unit 21. The display unit 17 can display the replacement determination result of the abnormal sound generating device by the device replacement determination unit 31. When the determination result that the abnormal sound generating device should be replaced is displayed, the replacement operation of the abnormal sound generating device can be performed.

[0064] use Fig. 9 The operation of this embodiment including such a configuration, that is, the abnormal sound diagnosis method of an elevator will be described.

[0065] First, as step S1, the car 1 is raised and lowered, and the sound is measured by each sound sensor 11 to 14. The raising and lowering pattern of the car 1 may be a raising and lowering pattern corresponding to the reference sound pressure data recorded in the sound database 15. For example, the car 1 may be raised and lowered from the lowest floor to the highest floor without stopping.

[0066] After step S1, in step S2, the sound pressure data generating unit 22 generates sound pressure measurement data based on the sounds measured by the sound sensors 11 to 14. In the present embodiment, four sound pressure measurement data are generated.

[0067] After step S2, as step S3, the first abnormal sound determination unit 23 determines whether an abnormal sound has occurred based on each sound pressure measurement data. More specifically, the first abnormal sound determination unit 23 obtains the sound pressure reference data corresponding to the lifting mode of the passenger car 1 from the sound database 15. Then, the first abnormal sound determination unit 23 determines whether an abnormal sound has occurred by comparing the sound pressure peak value of the corresponding sound pressure reference data with the sound pressure peak value of the sound pressure measurement data (refer to Figure 4 (a)). In the present embodiment, when the sound pressure peak difference ΔP for at least one piece of sound pressure measurement data is equal to or greater than the first threshold value, it can be determined that an abnormal sound has occurred.

[0068] If it is determined in step S3 that an abnormal sound has been generated, in step S4, the first time difference calculation unit 24 calculates the time difference between the times when the sound pressure peaks of the respective sound pressure measurement data are generated as the measurement time difference (see Figure 4 (b)). In this embodiment, the above-mentioned measurement time difference Δt is calculated. 21i , Δt 31i , Δt 41i .

[0069] If it is determined in step S3 that no abnormal sound has been generated, the spectrogram generator 25 generates a measured spectrogram based on the above-mentioned sound pressure measurement data in step S5. In the present embodiment, four measured spectrograms are generated.

[0070] After step S5, as step S6, the second abnormal sound determination unit 26 determines whether an abnormal sound has occurred based on each measured sound spectrogram. More specifically, the second abnormal sound determination unit 26 obtains a reference sound spectrogram corresponding to the lifting mode of the passenger car 1 from the sound database 15. Then, the second abnormal sound determination unit 26 determines whether an abnormal sound has occurred by comparing the peak frequency of the reference sound spectrogram with the peak frequency of the measured sound spectrogram (refer to Figure 5 (a)). In this embodiment, when the absolute value of the peak frequency difference Δf for at least one measured spectrogram is equal to or greater than the second threshold value, it can be determined that an abnormal sound has occurred.

[0071] If it is determined in step S6 that an abnormal sound has been generated, in step S7, the second time difference calculation unit 27 calculates the time difference between the times when the sound pressure peaks of the respective measured spectrograms are generated as the measured time difference (refer to Figure 5(b)). In this embodiment, the above-mentioned measurement time difference Δt is calculated. 21i , Δt 31i , Δt 41i .

[0072] When it is determined in step S6 that no abnormal sound has been generated, the process proceeds to step S12 described later.

[0073] After step S4 or step S7, as step S8, the direction calculation unit 28 calculates the direction of sound generation relative to the reference point SP defined by each sound sensor 11 to 14 based on the measurement time difference as the measured generation direction. When it is determined in step S3 that an abnormal sound has been generated, the direction calculation unit 28 uses the measurement time difference calculated in step S4. When it is determined in step S6 that an abnormal sound has been generated, the direction calculation unit 28 uses the measurement time difference calculated in step S7. The direction calculation unit 28 substitutes the measurement time difference into the above formula (1), and substitutes the above reference time difference for each direction, and calculates I for each direction. The measured generation direction is calculated as the direction at which I becomes the smallest.

[0074] After step S8, as step S9, the device identification unit 29 identifies the abnormal sound generating device that generates the abnormal sound based on the measured generation direction and the device configuration data. More specifically, the lifting position of the passenger car 1 is obtained by the above-mentioned car position acquisition unit 30. Next, the lifting position of the passenger car 1 at the time when the sound pressure peak is generated is determined, and the device configuration data at the lifting position is obtained from the device configuration database 16. Then, the device located at the direction closest to the measured generation direction is determined from the device configuration database 16 as the abnormal sound generating device.

[0075] After step S9, as step S10, the device replacement determination unit 31 determines whether the abnormal sound generating device should be replaced. If it is determined in step S3 that an abnormal sound is generated, when the sound pressure peak difference ΔP is greater than the third threshold value, it can be determined that the abnormal sound generating device should be replaced. If it is determined in step S6 that an abnormal sound is generated, when the peak frequency difference Δf is greater than the fourth threshold value, it can be determined that the abnormal sound generating device should be replaced.

[0076] If it is determined in step S10 that the abnormal sound generating device should be replaced, in step S11, the display unit 17 displays information about the abnormal sound generating device and the replacement determination result of the abnormal sound generating device. The operator who sees the display can perform the replacement operation of the abnormal sound generating device. After step S11, the abnormal sound diagnosis method of this embodiment can be terminated.

[0077] If it is determined in step S10 that the abnormal sound generating device should not be replaced, in step S12, the information is recorded by the information recording unit 32. More specifically, if it is determined in the above-mentioned step S3 or step S6 that an abnormal sound is generated, the information recording unit 32 records the information of the abnormal sound generating device and the replacement determination result of the abnormal sound generating device in a database not shown in the figure, etc. If it is determined in step S6 that no abnormal sound is generated, the information recording unit 32 records the above-mentioned various sound pressure measurement data and various measurement spectrograms in the sound database 15. After step S12, the abnormal sound diagnosis method of this embodiment can be terminated.

[0078] Thus, according to the present embodiment, when it is determined that an abnormal sound has been generated based on the sound pressure measurement data produced by the measurement of each sound sensor 11 to 14, the time difference of the time when the sound pressure peak of each sound pressure measurement data is generated is calculated as the measurement time difference. Based on the measurement time difference, the generation direction of the abnormal sound relative to the reference point SP defined by each sound sensor 11 to 14 is calculated as the measurement generation direction, and the abnormal sound generation device that generates the abnormal sound is determined based on the measurement generation direction and the device configuration data at the lifting position of the passenger car 1 where the sound pressure peak is generated. In this way, the abnormal sound generation device can be determined with a simple structure. Therefore, the abnormal sound of the elevator can be diagnosed inexpensively with a simple structure.

[0079] In addition, according to the present embodiment, the first abnormal sound determination unit 23 determines whether an abnormal sound has occurred by comparing the sound pressure peak value of the pre-stored sound pressure reference data with the sound pressure peak value of the sound pressure measurement data. In this way, it is possible to determine whether an abnormal sound has occurred based on the sound pressure peak value of the sound pressure measurement data. Therefore, it is possible to easily determine whether an abnormal sound has occurred, and the configuration of the first abnormal sound determination unit 23 can be simplified and inexpensive.

[0080] In addition, according to the present embodiment, the direction calculation unit 28 calculates the measured generation direction as the generation direction of the abnormal sound using the reference time difference, which is the time difference at which the sound generated at a certain generation direction relative to the reference point SP reaches each sound sensor 11 to 14. In this way, the measured generation direction can be easily calculated, and the configuration of the direction calculation unit 28 can be simplified and configured inexpensively. In particular, according to the present embodiment, the direction calculation unit 28 calculates the measured generation direction by calculating the square sum of the difference between the reference time difference and the measured time difference. In this way, the measured generation direction can be easily calculated.

[0081] In addition, according to the present embodiment, the device identification unit 29 identifies the device configuration data at the elevation position of the passenger car 1 where the sound pressure peak occurs, based on a plurality of device configuration data pre-stored for each elevation position of the passenger car 1. In this way, the device generating device of the abnormal sound can be identified using the device configuration data at the elevation position of the passenger car 1 when the abnormal sound occurs. Therefore, the configuration of the device identification unit 29 can be simplified and configured inexpensively.

[0082] In addition, according to the present embodiment, when it is determined by the first abnormal sound determination unit 23 that no abnormal sound is generated, the second abnormal sound determination unit 26 determines whether an abnormal sound is generated based on the measured sound spectrogram obtained according to each sound pressure measurement data. When the second abnormal sound determination unit 26 determines that an abnormal sound is generated, the time difference of the time when the sound pressure peak of each measured sound spectrogram is generated is calculated as the measurement time difference. In this way, even when it is determined that no abnormal sound is generated by the determination based on the sound pressure measurement data, when it is determined that an abnormal sound is generated based on the measured sound spectrogram, the measurement time difference can be calculated. Based on the calculated measurement time difference, the above-mentioned measurement generation direction can be calculated to determine the abnormal sound generating device. Therefore, the second abnormal sound determination unit 26 can determine whether an abnormal sound is generated from an angle different from that of the first abnormal sound determination unit 23, and can improve the accuracy of determining whether an abnormal sound is generated.

[0083] In addition, according to the present embodiment, the second abnormal sound determination unit 26 determines whether an abnormal sound has occurred by comparing the peak frequency corresponding to the sound pressure peak of the pre-stored reference spectrogram with the peak frequency corresponding to the sound pressure peak of the measured spectrogram. In this way, it is possible to determine whether an abnormal sound has occurred based on the sound pressure peak of the measured spectrogram. Therefore, it is possible to determine whether an abnormal sound has occurred from the perspective of whether there is a frequency shift.

[0084] In addition, according to the present embodiment, the device replacement determination unit 31 determines whether the abnormal sound generating device identified by the device identification unit 29 should be replaced. In this way, the operator can easily recognize whether the abnormal sound generating device should be replaced. Therefore, when it is determined that the abnormal sound generating device should be replaced, the abnormal sound generating device can be quickly replaced, and the safety and reliability of the elevator device can be improved.

[0085] In addition, in the above-mentioned present embodiment, an example of using four sound sensors 11 to 14 to perform abnormal sound diagnosis is described. However, the present embodiment is not limited to this. It is also possible to use any number of sound sensors more than two to perform abnormal sound diagnosis. In this case, the above-mentioned formula (1) is corrected to a formula corresponding to the number of sound sensors.

[0086] (Second embodiment)

[0087] Next, use Fig.10 , an abnormal sound diagnostic system and an abnormal sound diagnostic method for an elevator according to a second embodiment are described.

[0088] exist Fig.10 The second embodiment shown in the figure is mainly different in that the direction of the sound sensor can be changed, and the other structures are the same as those in the embodiment shown in the figure. Figures 1 to 9 The first embodiment shown is substantially the same. Fig.10 In, with Figures 1 to 9 The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0089] like Fig.10 As shown, the abnormal sound diagnostic system 10 of the present embodiment may further include a sensor driving unit 18 capable of changing the orientation of the sound sensors 11 to 14 and a sensor driving control unit 33 for controlling the sensor driving unit 18. The sound sensors 11 to 14 of the present embodiment each have directivity.

[0090] The sensor driving unit 18 is fixed to the upper surface of the passenger car 1. Four sensor driving units 18 are fixed to the upper surface of the passenger car 1, and the orientations of the corresponding sound sensors 11 to 14 can be changed. For example, the sensor driving unit 18 can be fixed to an upper beam located on the upper surface of the passenger car 1 by magnetic force. The sound sensors 11 to 14 can also be fixed to the sensor driving unit 18. For example, the sensor driving unit 18 can be configured as a three-axis rotating device. In this case, the orientation of the sound sensors 11 to 14 can be changed to an arbitrary direction. The sensor driving unit 18 is driven according to a control signal sent from the sensor driving control unit 33. The sensor driving control unit 33 can also be configured in the diagnostic device 20.

[0091] Thus, according to the present embodiment, the orientation of the sound sensors 11 to 14 can be changed by the sensor driving unit 18. In this way, the orientation of the sound sensors 11 to 14 can be directed toward the device that is expected to generate abnormal sound. Therefore, the accuracy of sound measurement can be improved, and the accuracy of abnormal sound diagnosis can be improved. In addition, the orientation of each sound sensor 11 to 14 can also be directed to different directions. In this case, sounds from multiple directions can be measured with good accuracy, and the accuracy of abnormal sound diagnosis can be improved.

[0092] According to the above-described embodiment, abnormal sounds of an elevator can be diagnosed at low cost with a simple configuration.

[0093] Several embodiments of the present invention have been described above, but these embodiments are provided as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the scope of the purpose of the invention. These embodiments and / or their variations are included in the scope and purpose of the invention, and are included in the invention described in the claims and the scope of their equivalents.

Claims

1. An abnormal sound diagnosis system for an elevator, comprising: Two or more sound sensors are provided on the upper surface of the passenger car to measure the sound generated during the raising and lowering of the passenger car; a first abnormal sound determination unit that determines whether an abnormal sound has occurred based on sound pressure measurement data produced by measurements of each of the sound sensors; a first time difference calculation unit for calculating, when the first abnormal sound determination unit determines that an abnormal sound has been generated, a time difference between times when sound pressure peaks of the respective sound pressure measurement data are generated as a measurement time difference; a direction calculating unit that calculates, based on the measurement time difference, a generation direction of the abnormal sound relative to a reference point defined by each of the sound sensors as a measured generation direction; as well as A device identification unit identifies an abnormal sound generating device that generates the abnormal sound based on the measured generation direction and the device arrangement data at the raising and lowering position of the passenger car where the sound pressure peak value is generated.

2. The abnormal sound diagnostic system for an elevator according to claim 1, The first abnormal sound determination unit determines whether an abnormal sound has occurred by comparing a sound pressure peak value of sound pressure reference data stored in advance with the sound pressure peak value of the sound pressure measurement data.

3. The abnormal sound diagnosis system for an elevator according to claim 1 or 2, The direction calculation unit calculates the measured generation direction using a reference time difference, which is a time difference at which a sound generated at a certain generation direction relative to the reference point reaches each of the acoustic sensors.

4. The abnormal sound diagnosis system for an elevator according to claim 3, The azimuth calculation unit calculates the measured azimuth by calculating a square root of a square of a difference between the reference time difference and the measured time difference.

5. The abnormal sound diagnosis system for an elevator according to claim 1 or 2, The device identification unit identifies the device arrangement data at the elevation position of the passenger car where the sound pressure peak occurs, based on a plurality of device arrangement data pre-stored for each elevation position of the passenger car.

6. The abnormal sound diagnostic system for an elevator according to claim 1 or 2, further comprising: a second abnormal sound determination unit that determines whether an abnormal sound has been generated based on a measured sound spectrogram obtained from each of the sound pressure measurement data, when the first abnormal sound determination unit determines that no abnormal sound has been generated; and The second time difference calculation unit calculates a time difference between times at which sound pressure peaks of the respective measurement spectrograms are generated as the measurement time difference when the second abnormal sound determination unit determines that an abnormal sound is generated.

7. The abnormal sound diagnostic system for an elevator according to claim 6, The second abnormal sound determination unit determines whether an abnormal sound has occurred by comparing a peak frequency of a pre-stored reference sound spectrogram with a peak frequency of the measured sound spectrogram.

8. The abnormal sound diagnostic system for an elevator according to claim 1 or 2, further comprising: A device replacement determination unit determines whether the abnormal sound generating device specified by the device specifying unit should be replaced.

9. The abnormal sound diagnostic system for an elevator according to claim 1 or 2, further comprising: a sensor driving unit capable of changing the orientation of the acoustic sensor; and A sensor drive control unit controls the sensor drive unit.

10. A method for diagnosing abnormal sound of an elevator, comprising: The step of measuring the sound generated during the raising and lowering of the passenger car by two or more sound sensors provided on the upper surface of the passenger car; a step of determining whether an abnormal sound has been generated based on the sound pressure measurement data produced by the measurement of each of the sound sensors; When it is determined that an abnormal sound has been generated, a step of calculating a time difference between times when sound pressure peaks of each of the sound pressure measurement data are generated as a measurement time difference; Based on the measurement time difference, a step of calculating a generation direction of the abnormal sound relative to a reference point defined by each of the sound sensors as a step of measuring the generation direction; as well as The step of determining an abnormal sound generating device that generates the abnormal sound based on the measured generation direction and the device arrangement data at the raising and lowering position of the passenger car where the sound pressure peak is generated.

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