Vibration measurement device, vibration measurement system, vibration measurement method, and program

Abstract

To provide a vibration measuring device capable of accurately measuring vibration of a measurement object from images taken at different distances from two directions of the measurement object having a cylindrical shape.SOLUTION: A vibration measuring device for measuring vibration of a measurement object includes: an image acquisition part for acquiring a first image taken of a first region including a surface facing the horizontal direction of the measurement object; and a second image taken of a second region including a surface facing the vertical direction of the measurement object; a measurement part for measuring a first vibration level indicating the vibration level of the measurement object in the vertical direction based on the first image and measuring a second vibration level indicating the vibration level of the measurement object in the horizontal direction based on the second image; and a correction part for correcting the first vibration level and the second vibration level based on the ratio of the axis width of the measurement object in each of the first image and the second image to the actual axis width of the measurement object.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a vibration measuring device, a vibration measuring system, a vibration measuring method, and a program. [Background technology]

[0002] There are technologies being considered that can grasp the condition of an object to be inspected from images of the object, such as a structure or machine. For example, Patent Document 1 describes a technology that measures the in-plane displacement of a structure such as a bridge from images of the structure to inspect the condition of the structure.

[0003] Furthermore, technology is being considered to measure the vibration state of the inspection object (the location where the vibration is occurring, the magnitude of the vibration, etc.) from the captured images. For example, a vibration measurement device that measures the vibration of the rotating shaft of a rotating machine or the like uses a non-contact sensor to measure the rotating shaft from two directions, horizontally and vertically. For example, two cameras are used as these sensors. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2020 / 255231 Summary of the Invention [Problem to be solved by the invention]

[0005] Normally, when using two cameras, in order to accurately measure the horizontal and vertical displacement of the rotation axis, the cameras must be positioned so that they are equidistant from the rotation axis. However, there are cases where other equipment or structures exist around the rotation axis, making it impossible to position the cameras equidistant. In such cases, the size of the rotation axis captured in the images from each camera will differ, making it difficult to accurately measure the vibration of the rotation axis.

[0006] The present disclosure has been made in consideration of such problems, and provides a vibration measuring device, a vibration measuring system, a vibration measuring method, and a program that can accurately measure the vibration of a measurement object having a cylindrical shape such as a rotating shaft from images taken of the object from two directions at different distances. [Means for solving the problem]

[0007] According to one aspect of the present disclosure, a vibration measuring device that measures the vibration of a cylindrically shaped measurement object includes an image acquisition unit that acquires a first image that captures a first area including a horizontally facing surface of the measurement object and a second image that captures a second area including a vertically facing surface of the measurement object, a measurement unit that measures a first vibration level that indicates the vibration level of the measurement object in the vertical direction based on the first image and measures a second vibration level that indicates the vibration level of the measurement object in the horizontal direction based on the second image, and a correction unit that corrects the first vibration level and the second vibration level based on the ratio between the axial width of the measurement object in the first image and the second image, respectively, and the actual axial width of the measurement object.

[0008] According to one aspect of the present disclosure, a vibration measurement system for measuring vibrations of a cylindrically shaped measurement object includes an image acquisition unit that acquires a first image of a first region including a horizontally facing surface of the measurement object and a second image of a second region including a vertically facing surface of the measurement object, a measurement unit that measures a first vibration level indicating the vibration level of the measurement object in the vertical direction based on the first image and measures a second vibration level indicating the vibration level of the measurement object in the horizontal direction based on the second image, and a correction unit that corrects the first vibration level and the second vibration level based on the ratio between the axial width of the measurement object in the first image and the second image, respectively, and the actual axial width of the measurement object.

[0009] According to one aspect of the present disclosure, a vibration measurement method for measuring the vibration of a cylindrically shaped measurement object includes the steps of acquiring a first image capturing a first region including a horizontally facing surface of the measurement object and a second image capturing a second region including a vertically facing surface of the measurement object, measuring a first vibration level indicating the vibration level of the measurement object in the vertical direction based on the first image, and measuring a second vibration level indicating the vibration level of the measurement object in the horizontal direction based on the second image, and correcting the first vibration level and the second vibration level based on the ratio between the axial width of the measurement object in the first image and the second image, respectively, and the actual axial width of the measurement object.

[0010] According to one aspect of the present disclosure, a program causes a vibration measuring device that measures the vibration of a cylindrically shaped measurement object to acquire a first image that captures a first area including a surface of the measurement object facing horizontally and a second image that captures a second area including a surface of the measurement object facing vertically; measure a first vibration level that indicates the vibration level of the measurement object in the vertical direction based on the first image, and measure a second vibration level that indicates the vibration level of the measurement object in the horizontal direction based on the second image; and correct the first vibration level and the second vibration level based on the ratio between the axial width of the measurement object in the first image and the second image, respectively, and the actual axial width of the measurement object. [Effects of the Invention]

[0011] According to the vibration measuring device, vibration measuring system, vibration measuring method, and program disclosed herein, the vibration of a cylindrical object can be measured with high accuracy from images of the object taken from two directions at different distances. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a diagram illustrating an overall configuration of a vibration measuring system according to a first embodiment of the present disclosure. [Figure 2]FIG. 2 is a diagram for explaining the arrangement of the vibration measuring system according to the first embodiment of the present disclosure. [Figure 3] 1 is a block diagram showing a functional configuration of a vibration measuring device according to a first embodiment of the present disclosure. [Figure 4] 5 is a flowchart illustrating an example of processing performed by the vibration measuring device according to the first embodiment of the present disclosure. [Figure 5] FIG. 2 is a diagram for explaining functions of the vibration measuring device according to the first embodiment of the present disclosure. [Figure 6] FIG. 10 is a first diagram for explaining the function of a vibration measuring device according to a second embodiment of the present disclosure. [Figure 7] FIG. 10 is a second diagram for explaining the function of the vibration measuring device according to the second embodiment of the present disclosure. [Figure 8] FIG. 10 is a diagram for explaining the arrangement of a vibration measuring system according to a third embodiment of the present disclosure. [Figure 9] FIG. 10 is a diagram for explaining functions of a vibration measuring device according to a third embodiment of the present disclosure. [Figure 10] FIG. 10 is a diagram for explaining the arrangement of a vibration measuring system according to a fourth embodiment of the present disclosure. [Figure 11] FIG. 10 is a diagram illustrating the overall configuration of a vibration measuring system according to a fifth embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0013] First Embodiment A vibration measuring system 1 and a vibration measuring device 10 according to a first embodiment of the present disclosure will be described below with reference to FIGS.

[0014] (Overall composition) FIG. 1 is a diagram showing the overall configuration of a vibration measuring system according to a first embodiment of the present disclosure. FIG. 2 is a diagram for explaining the arrangement of the vibration measuring system according to the first embodiment of the present disclosure. The vibration measurement system 1 is a system for measuring vibrations of a cylindrical measurement target from two directions. In this embodiment, the measurement target is, for example, a rotating shaft 90 of a rotating machine (turbine, motor, etc.). As shown in Fig. 1 , the vibration measurement system 1 according to this embodiment measures vibrations of the rotating shaft 90 in two directions: a horizontal direction (X-axis direction) and a vertical direction (Y-axis direction) perpendicular to the axial direction (Z-axis direction) in which the axis O of the rotating shaft 90 extends.

[0015] The vibration measurement system 1 includes a mirror 2, a camera 3, and a vibration measurement device 10.

[0016] The mirror 2 is arranged so as to face either a first region R1 including the surface of the rotation shaft 90 facing in the horizontal direction or a second region R2 including the surface of the rotation shaft 90 facing in the vertical direction.

[0017] The camera 3 simultaneously captures an image of the rotation shaft 90 reflected on the mirror 2 facing one of the first region R1 and the second region R2, and the image of the rotation shaft 90 in the other of the first region R1 and the second region R2. The images captured by the camera 3 are sequentially transmitted to the vibration measuring device 10.

[0018] 1 and 2, in this embodiment, mirror 2 is provided above rotation shaft 90 so as to face second region R2, and camera 3 is provided beside rotation shaft 90 so as to face first region R1. As shown in FIG. 2, camera 3 is disposed so that the direction of its optical axis L1 coincides with the horizontal direction and is perpendicular to axis O of rotation shaft 90. Mirror 2 is also disposed at an angle of 45 degrees relative to the direction of optical axis L1 of camera 3 (horizontal direction). By using mirror 2 disposed in this manner, camera 3 can simultaneously capture images of the state of rotation shaft 90 as viewed from two directions: the direction of optical axis L1 (horizontal direction) and a direction perpendicular to optical axis L1 (vertical direction).

[0019] In other embodiments, the positions of the mirror 2 and the camera 3 may be reversed. In this case, the camera 3 is positioned so that it faces the second region R2 from directly above the rotation shaft 90, with the direction of the optical axis L1 aligned with the vertical direction and perpendicular to the axis O of the rotation shaft 90. The mirror 2 is also positioned so that it faces the first region R1 from the side of the rotation shaft 90 and is tilted at an angle of 45 degrees with respect to the direction of the optical axis L1 (the vertical direction).

[0020] The vibration measuring device 10 measures the vibration of the rotation shaft 90 in two directions, the horizontal direction and the vertical direction, from a plurality of frames of images (videos) captured by the camera 3.

[0021] (Functional configuration of vibration measurement device) FIG. 3 is a block diagram showing the functional configuration of the vibration measuring device according to the first embodiment of the present disclosure. As shown in FIG. 3, the vibration measuring device 10 includes a processor 11, a memory 12, a storage 13, a communication interface 14, a display device 15, and an input device 16.

[0022] The processor 11 operates in accordance with a predetermined program to function as an image acquisition unit 110, a measurement unit 111, and a correction unit 112.

[0023] The image acquisition unit 110 acquires a first image V1 that captures a first region R1 that includes a surface facing horizontally of the rotation axis 90, and a second image V2 that captures a second region R2 that includes a surface facing vertically of the rotation axis 90.

[0024] The measurement unit 111 measures a first vibration level indicating the vibration level in the vertical direction of the rotation axis 90 based on the first image V1. The measurement unit 111 also measures a second vibration level indicating the vibration level in the horizontal direction of the rotation axis based on the second image V2.

[0025] The correction unit 112 corrects the first vibration level and the second vibration level based on the ratio between the shaft width of the rotation shaft 90 in each of the first image V1 and the second image V2 and the actual shaft width of the rotation shaft 90.

[0026] The predetermined program executed by the processor 11 is stored in a computer-readable recording medium. Computer-readable recording media include magnetic disks, optical magnetic disks, CD-ROMs, DVD-ROMs, and semiconductor memories. The computer program may be distributed to a computer via a communication line, and the computer that receives the distribution may execute the program. The program may also be a program for implementing some of the above-described functions. Furthermore, the program may be a so-called differential file (differential program) that can realize the above-described functions in combination with a program already stored in the computer system.

[0027] The memory 12 has a memory area necessary for the operation of the processor 11 .

[0028] The storage 13 is a so-called auxiliary storage device, such as a hard disk drive (HDD) or a solid state drive (SSD).

[0029] The communication interface 14 is an interface for transmitting and receiving various signals to and from an external device (camera 3).

[0030] The display device 15 is a display device that displays vibration measurement results and the like, and is, for example, a liquid crystal display or an organic EL display.

[0031] The input device 16 is an input device that accepts operations by the user of the vibration measuring device 10, and is, for example, a general mouse, keyboard, touch sensor, or the like.

[0032] (Processing flow of vibration measuring device) FIG. 4 is a flowchart showing an example of processing of the vibration measuring device according to the first embodiment of the present disclosure. An example of the process in which the vibration measuring device 10 measures the vibration of the rotating shaft 90 will be described below with reference to FIG.

[0033] First, the image acquisition unit 110 acquires a first image V1 and a second image V2 from the camera 3 (step S10). As shown in Fig. 2, the camera 3 according to this embodiment simultaneously captures the first image V1 (a real image obtained by directly capturing the first region R1) and the second image V2 (an image of the second region R2 reflected in the mirror 2). Therefore, the image acquisition unit 110 acquires from the camera 3 a single image in which the first image V1 and the second image V2 are arranged one above the other.

[0034] Next, the measurement unit 111 measures the vibration level of the rotation shaft 90 based on the first image V1 and the second image V2 (step S11).

[0035] FIG. 5 is a diagram for explaining the function of the vibration measuring device according to the first embodiment of the present disclosure. The measurement unit 111 measures the vibration level in the vertical direction (Y-axis direction) of the rotation shaft 90 based on a first image V1 that captures the side of the rotation shaft 90, among the images acquired by the camera 3. For example, the measurement unit 111 measures the displacement of the first image V1 in the up-down direction by performing known image processing on the first image V1. This displacement represents the vibration level (first vibration level) in the vertical direction (Y-axis direction) of the rotation shaft 90. Similarly, the measurement unit 111 measures the displacement of the second image V2 in the up-down direction by performing predetermined image processing on the second image V2. This displacement represents the vibration level (second vibration level) in the horizontal direction (X-axis direction) of the rotation shaft 90.

[0036] Furthermore, the correction unit 112 corrects the first vibration level and the second vibration level based on the size of the rotation axis 90 in each of the first image V1 and the second image V2 (step S12).

[0037] 2 and 5, because the second image V2 captures the rotation axis 90 via the mirror 2, the apparent size of the rotation axis 90 is smaller (the distance from the camera 3 to the rotation axis 90 appears farther) than in the first image V1, which captures the rotation axis 90 directly. As a result, the displacement amplitude in the second image V2 may be measured less than the displacement amplitude in the first image V1.

[0038] For this reason, the correction unit 112 according to this embodiment corrects the first vibration level and the second vibration level based on the ratio between the apparent shaft widths D1 and D2 of the rotation shaft 90 in the first image V1 and the second image V2, respectively, and the actual shaft width (shaft diameter) of the rotation shaft 90. The correction unit 112 performs known image processing (such as edge detection) on the first image V1 and the second image V2 to measure the distance between edges, thereby determining the apparent shaft width D1 in the first image V1 and the apparent shaft width D2 in the second image V2. The actual shaft width of the rotation shaft 90 is measured in advance and recorded in the storage 13. This allows the correction unit 112 to determine the first vibration level and the second vibration level of the rotation shaft 90 on the same scale, regardless of the positions of the mirror 2 and the camera 3 (such as the distance from the rotation shaft 90).

[0039] 5, the correction unit 112 may generate vibration data of the rotating shaft 90 in which the corrected first vibration level and second vibration level are expressed in Cartesian coordinates, and display the data on the display device 15. This makes it easier for the user of the vibration measuring device 10 to check the vibration state of the rotating shaft 90.

[0040] (Action, effect) As described above, the vibration measuring device 10 of this embodiment includes an image acquisition unit 110 that acquires a first image V1 that captures a first region R1 including a surface of the rotation axis 90 facing horizontally and a second image V2 that captures a second region R2 including a surface of the rotation axis 90 facing vertically, a measurement unit 111 that measures a first vibration level in the vertical direction of the rotation axis 90 and a second vibration level in the horizontal direction based on the first image V1 and the second image V2, and a correction unit 112 that corrects the first vibration level and the second vibration level based on the ratio between the apparent axial widths D1, D2 of the rotation axis 90 in the first image V1 and the second image V2, respectively, and the actual axial width of the rotation axis 90.

[0041] By doing this, the vibration measuring device 10 can determine the first vibration level and the second vibration level of the rotation axis 90 on the same scale even if the apparent size (apparent distance to the rotation axis 90) of the rotation axis 90 in the first image V1 and the second image V2 is different.

[0042] In addition, the image acquisition unit 110 acquires an image including a first image V1 and a second image V2 from a camera 3 that simultaneously captures an image of the rotation axis 90 reflected in a mirror 2 facing one side of the second region R2 and the rotation axis 90 in the first region R1.

[0043] In this way, the vibration measuring device 10 can acquire images of the rotation axis 90 simultaneously from two directions with a compact configuration using only one camera 3. Furthermore, compared to systems that measure vibrations with two cameras, the vibration measuring device 10 can omit processing such as incorporating a trigger signal to synchronize the measurement timing of each camera.

[0044] Furthermore, camera 3 is disposed so that optical axis L1 is perpendicular to axis O of rotation shaft 90, and mirror 2 is disposed so that the angle it forms with the direction of optical axis L1 of camera 3 is 45 degrees.

[0045] By doing this, the vibration measuring device 10 can simultaneously photograph the rotation axis 90 from two mutually perpendicular directions, and can therefore accurately measure the first vibration level and second vibration level of the rotation axis 90 for each of these two directions.

[0046] <Second embodiment> Next, a vibration measuring system 1 and a vibration measuring device 10 according to a second embodiment of the present disclosure will be described with reference to FIGS. Components common to the first embodiment are given the same reference numerals and detailed description thereof will be omitted.

[0047] FIG. 6 is a first diagram for explaining the function of the vibration measuring device according to the second embodiment of the present disclosure. FIG. 6 is a second diagram for explaining the function of the vibration measuring device according to the second embodiment of the present disclosure. 6, an example will be described in which a stationary-side member 91 is provided near a rotating shaft 90 and the vibration measuring device 10 measures the vibration of the rotating shaft 90 from the relative displacement between the stationary-side member 91 and the rotating shaft 90. The stationary-side member 91 is, for example, the foundation or casing of a rotating machine.

[0048] The first region R1 is set to include the side surface of the rotating shaft 90 and a portion of the side surface of the stationary-side member 91. Similarly, the second region R2 is set to include the top surface of the rotating shaft 90 and a portion of the top surface of the stationary-side member 91. Therefore, as shown in Fig. 7, the first image V1 and the second image V2 are images of the rotating shaft 90 and the stationary-side member 91, respectively.

[0049] In addition, the measurement unit 111 of the vibration measuring device 10 measures the first vibration level and the second vibration level of the rotating shaft 90 from the relative displacement between the rotating shaft 90 and the stationary side member 91 in the first image V1 and the second image V2, respectively, as shown in Figure 7.

[0050] Specifically, the measurement unit 111 sets a measurement point Pd1 of the vibration of the rotating shaft 90 on the first image V1, and also sets a fixed point Ps1 of the stationary-side member 91, which can be considered rigid (on the stationary side) relative to the rotating shaft 90 (measurement point Pd1). The measurement unit 111 may set points specified on the first image V1 by a user of the vibration measuring device 10 as the measurement point Pd1 and the fixed point Ps1. Alternatively, the measurement unit 111 may automatically detect the rotating shaft 90 and the stationary-side member 91 using known image processing and set the measurement point Pd1 and the fixed point Ps1. The measurement unit 111 measures a first vibration level of the rotating shaft 90 from the relative displacement between the measurement point Pd1 and the fixed point Ps1 on the first image V1. The measurement unit 111 similarly sets a measurement point Pd2 and a fixed point Ps2 on the second image V2 and measures a second vibration level of the rotating shaft 90 from the relative displacement between them.

[0051] In this way, even if the vibration of the rotating shaft 90 is transmitted to the camera 3, the vibration measuring device 10 can remove the vibration of the camera 3 and measure the first vibration level and the second vibration level with high accuracy. Furthermore, even if the camera 3 does not move (is not affected by vibration) and the rotating shaft 90 to be measured and the stationary-side member 91 as a whole move rigidly, the vibration measuring device 10 can measure the displacement of the rotating shaft 90 vibrating relative to the stationary-side member 91 after moving rigidly.

[0052] <Third embodiment> Next, a vibration measuring system 1 and a vibration measuring device 10 according to a third embodiment of the present disclosure will be described with reference to FIGS. Components common to the above-described embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0053] FIG. 8 is a diagram for explaining the arrangement of a vibration measuring system according to the third embodiment of the present disclosure. FIG. 9 is a diagram for explaining functions of a vibration measuring device according to the third embodiment of the present disclosure. There may be cases where restrictions are placed on the placement and angles of the mirror 2 and camera 3 due to the presence of obstacles such as other structures or machinery near the rotation axis 90.

[0054] Taking such cases into consideration, the vibration measuring device 10 of this embodiment is capable of measuring vibration levels in the horizontal and vertical directions of the rotation axis 90, even when the mirror 2 and camera 3 are installed at any angle, as shown in Figure 8.

[0055] For example, the correcting unit 112 of the vibration measuring device 10 according to this embodiment corrects the vibration level (first vibration level) in the vertical direction (Y-axis direction) based on the tilt of the optical axis L1 of the camera 3 relative to the horizontal direction (X-axis direction) or the tilt of the direction L2 in which the mirror 2 faces. The correcting unit 112 also corrects the second vibration level in the horizontal direction (X-axis direction) based on the tilt of the optical axis L1 of the camera 3 relative to the vertical direction (Y-axis direction) or the tilt of the direction L2 in which the mirror 2 faces.

[0056] 8 and 9, it is assumed that the tilt (angle formed with respect to the horizontal direction (X-axis direction)) of the optical axis L1 of the camera 3 is "θ1," and the first vibration level (displacement of the rotation axis 90 on the image plane IP1) measured from the first image V1 by the measurement unit 111 is "a." At this time, the correction unit 112 converts the first vibration level into (x1, y1) expressed in a coordinate system (XY coordinate system) based on the rotation axis 90, using the following equation (1):

[0057]

number

[0058] 8 and 9, it is assumed that the inclination (angle relative to the vertical direction (Y-axis direction)) of the direction L2 in which mirror 2 faces is "θ2," and the second vibration level (displacement of rotation axis 90 on image plane IP2) measured from second image V2 by measurement unit 111 is "b." At this time, correction unit 112 converts the second vibration level into (x2, y2) expressed in the XY coordinate system of rotation axis 90 using the following equation (2).

[0059]

number

[0060] At this time, the displacement (X, Y) of the rotation axis 90 in the XY coordinate system obtained from the first image V1 and the second image V2 captured at the same time is expressed by the following equation (3).

[0061]

number

[0062] The above formulas (1) to (3) are merely examples, and the ±, Sin, and Cos in the above formulas (1) to (3) are changed according to the positions and angles of the mirror 2 and the camera 3.

[0063] The value of the inclination θ1 of the optical axis L1 of the camera 3 and the value of the inclination θ2 of the direction L2 in which the mirror 2 faces are values ​​measured, for example, when the camera 3 and the mirror 2 are installed, and are input into the vibration measuring device 10 by the user before measuring the vibration.

[0064] Furthermore, the correction unit 112 may perform correction based on the angles of the camera 3 and the mirror 2 described above after performing correction based on the size of the rotation axis 90 in each of the first image V1 and the second image V2.

[0065] In this way, the vibration measuring device 10 can accurately measure the vibration level of the rotation shaft 90 regardless of the arrangement (position, angle) of the camera 3 and mirror 2. This allows the arrangement of the camera 3 and mirror 2 to be freely changed depending on the environment around the rotation shaft 90, so the vibration measuring device 10 can also be used in environments where there are obstacles around the rotation shaft 90.

[0066] <Fourth embodiment> Next, a vibration measuring system 1 and a vibration measuring device 10 according to a fourth embodiment of the present disclosure will be described with reference to FIG. Components common to the above-described embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0067] FIG. 10 is a diagram for explaining the arrangement of a vibration measuring system according to the fourth embodiment of the present disclosure. 10, there may be cases where an obstacle 92 such as another device or structure is present near the rotation axis 90, making it impossible to install the camera 3 in a position where it can directly photograph the rotation axis 90. Taking such cases into consideration, the camera 3 according to this embodiment photographs both the first region R1 and the second region R2 via the mirrors 2 (first mirror 20a, second mirror 20b).

[0068] Furthermore, if it is difficult to avoid obstacles 92 and capture images using only first mirror 20a and second mirror 20b, auxiliary mirrors 21a and 21b may be installed. In the example of FIG. 10, camera 3 captures the image of rotation shaft 90 reflected on first mirror 20a (image of first region R1) via auxiliary mirror 21a, and captures the image of rotation shaft 90 reflected on second mirror 20b (image of second region R2) via auxiliary mirror 21b. While FIG. 10 shows an example in which two auxiliary mirrors are provided, this is not limiting. In other embodiments, the number of auxiliary mirrors may be one, three, or more.

[0069] In this way, even if the camera 3 cannot be installed in a position where it can directly photograph the rotation shaft 90, the vibration measuring device 10 can acquire images of the rotation shaft 90 from two directions via the two mirrors 20a, 20b. This makes the vibration measuring device 10 applicable to environments where there are obstacles 92 around the rotation shaft 90.

[0070] 10 shows an example of an arrangement in which first mirror 20a is tilted 45 degrees with respect to the vertical direction (Y-axis direction) and second mirror 20b is tilted 45 degrees with respect to the horizontal direction (X-axis direction), as in the first embodiment. By arranging them in this manner, corrector 112 of vibration measuring device 10 can omit the correction performed in the third embodiment according to the tilt of direction L2 in which mirror 2 faces.

[0071] In other embodiments, the angles of first mirror 20a and second mirror 20b may be changed as desired. In this case, corrector 112 of vibration measuring device 10 performs the correction according to the tilt of direction L2 in which mirror 2 faces, as was done in the third embodiment. This allows camera 3, first mirror 20a, second mirror 20b, and auxiliary mirror to be freely positioned according to the environment around rotation axis 90.

[0072] <Fifth embodiment> Next, a vibration measuring system 1 and a vibration measuring device 10 according to a fifth embodiment of the present disclosure will be described with reference to FIG. Components common to the above-described embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0073] FIG. 11 is a diagram showing the overall configuration of a vibration measuring system according to the fifth embodiment of the present disclosure. 11, the vibration measurement system 1 according to this embodiment further includes a blower 4. The blower 4 blows air to the measurement locations (first region R1 and second region R2) of the rotating shaft 90, thereby suppressing fluctuations caused by heat around the rotating shaft 90.

[0074] By doing this, even if fluctuations (temperature fluctuations) due to high temperatures occur around the rotating shaft 90, the vibration measurement system 1 can suppress temperature fluctuations in the first region R1 and the second region R2 where the vibration of the rotating shaft 90 is measured by blowing air from the blower 4.

[0075] As described above, several embodiments according to the present disclosure have been described, but all of these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope of the invention and its equivalents as defined in the claims, as well as in the scope and spirit of the invention.

[0076] For example, in each of the above-described embodiments, the vibration measuring device 10 has been described as using a combination of the camera 3 and the mirror 2 to simultaneously capture images of the rotation shaft 90 from two directions, but this is not limiting. In other embodiments, instead of using a combination of the camera 3 and the mirror 2, two cameras 3 may be used to simultaneously capture images of the rotation shaft 90 from two directions.

[0077] In the above embodiment, the vibration measurement system 1 has been described as measuring the rotating shaft 90 of a rotating machine, but the present invention is not limited to this. In other embodiments, the vibration measurement system 1 may measure a structure or the like that has a cylindrical shape similar to the rotating shaft 90 and generates similar vibrations.

[0078] Furthermore, in the above-described embodiment, the correction unit 112 corrects the first vibration level and the second vibration level based on the ratio between the apparent shaft widths D1 and D2 of the rotation shaft 90 in the first image V1 and the second image V2, respectively, and the actual shaft width of the rotation shaft. However, this is not limiting. In other embodiments, the correction unit 112 of the vibration measuring device 10 may pre-learn the correction amounts (calibration values) of the first vibration level and the second vibration level. For example, a user of the vibration measuring device 90 moves the rotation shaft 90 by predetermined amounts in the horizontal and vertical directions. The measurement unit 111 of the vibration measuring device 10 measures the first vibration level and the second vibration level of the rotation shaft 90 after the movement. The correction unit 112 of the vibration measuring device 10 also calculates the vibration sensitivity (calibration value) from the actual movement amount of the rotation shaft 90 and the first vibration level and the second vibration level measured by the measurement unit 111. When the vibration measuring device 10 measures the vibration of the rotating shaft 90, the correction unit 112 corrects the first vibration level and the second vibration level using a pre-calculated calibration value. Even in this manner, the vibration measuring device 10 can accurately measure the first vibration level and the second vibration level.

[0079] <Additional Notes> The vibration measuring device, the vibration measuring system, the vibration measuring method, and the program described in the above-described embodiments can be understood, for example, as follows.

[0080] (1) According to a first aspect of the present disclosure, a vibration measuring device (10) includes an image acquisition unit (110) that acquires a first image of a first region including a horizontally facing surface of a cylindrical measurement object (90) and a second image of a second region including a vertically facing surface of the measurement object (90); a measurement unit (111) that measures a first vibration level indicating the vibration level of the measurement object (90) in the vertical direction based on the first image and measures a second vibration level indicating the vibration level of the measurement object (90) in the horizontal direction based on the second image; and a correction unit (112) that corrects the first vibration level and the second vibration level based on the ratio between the axial width of the measurement object (90) in the first image and the second image, respectively, and the actual axial width of the measurement object (90).

[0081] By doing this, the vibration measuring device can determine the first vibration level and second vibration level of the measurement object on the same scale even if the apparent size of the measurement object in the first image and the second image, i.e., the apparent distance to the measurement object, is different.

[0082] (2) According to a second aspect of the present disclosure, in the vibration measuring device (10) according to the first aspect, the measuring unit (111) measures a first vibration level and a second vibration level of the measurement object (90) from the relative displacement between the measurement object (90) and the stationary side member (91) included in the first image and the second image, respectively.

[0083] In this way, even if vibration of the measurement target is transmitted to the camera, the vibration measuring device can remove the vibration of camera 3 and accurately measure the first vibration level and the second vibration level. Alternatively, even if the measurement target and the stationary member move as a whole and vibration of the measurement target occurs, the vibration measuring device can measure the relative vibration displacement of the measurement target with respect to the stationary member.

[0084] (3) According to a third aspect of the present disclosure, in the vibration measuring device (10) according to the first or second aspect, the image acquisition unit (110) acquires an image including a first image and a second image from a camera (3) that simultaneously captures an image of the measurement object (90) reflected in a mirror (2) facing one of the first area and the second area, and the measurement object (90) in the other of the first area and the second area.

[0085] By doing this, the vibration measuring device can acquire images of the measurement target from two directions simultaneously with a compact configuration using only one camera. Also, compared to conventional systems that measure vibrations with two cameras, the vibration measuring device can omit processes such as incorporating trigger signals to synchronize the measurement timing of each camera.

[0086] (4) According to a fourth aspect of the present disclosure, in the vibration measuring device (10) according to the first or second aspect, the image acquisition unit (110) acquires an image including a first image and a second image from a camera (3) that simultaneously captures an image of the measurement object (90) reflected in a mirror (20a, 20b) facing one of the first area and the second area and an image of the measurement object (90) reflected in a mirror (20a, 20b) facing the other of the first area and the second area.

[0087] In this way, even if it is not possible to install a camera in a position where it can directly photograph the object, the vibration measuring device can acquire images of the object from two directions via two mirrors, making it possible to apply the vibration measuring device to environments where there are obstacles around the object.

[0088] (5) According to a fifth aspect of the present disclosure, in the vibration measuring device (10) according to the third or fourth aspect, the correction unit (112) further corrects the first vibration level based on the tilt of the optical axis of the camera (3) relative to the horizontal direction or the tilt of the direction in which the mirror (2) faces relative to the horizontal direction.

[0089] In this way, the vibration measuring device can accurately measure the first vibration level of the measurement object regardless of the arrangement (position, angle) of the camera and mirror. This allows the arrangement of the camera and mirror to be freely changed depending on the environment around the measurement object, so the vibration measuring device can be applied to environments where there are obstacles around the measurement object.

[0090] (6) According to a sixth aspect of the present disclosure, in the vibration measuring device (10) according to any one of the third to fifth aspects, the correction unit (112) further corrects the second vibration level based on the tilt of the optical axis of the camera (3) relative to the vertical direction or the tilt of the direction in which the mirror (2) faces relative to the vertical direction.

[0091] In this way, the vibration measuring device can accurately measure the second vibration level of the measurement object regardless of the arrangement (position, angle) of the camera and mirror. This allows the arrangement of the camera and mirror to be freely changed depending on the environment around the measurement object, so the vibration measuring device can also be applied to environments where there are obstacles around the measurement object.

[0092] (7) According to a seventh aspect of the present disclosure, a vibration measurement system (1) includes an image acquisition unit (110) that acquires a first image of a first region including a horizontally facing surface of a cylindrical measurement object (90) and a second image of a second region including a vertically facing surface of the measurement object (90); a measurement unit (111) that measures a first vibration level indicating the vibration level of the measurement object (90) in the vertical direction based on the first image and measures a second vibration level indicating the vibration level of the measurement object (90) in the horizontal direction based on the second image; and a correction unit (112) that corrects the first vibration level and the second vibration level based on the ratio between the axial width of the measurement object (90) in the first image and the second image, respectively, and the actual axial width of the measurement object (90).

[0093] By doing this, the vibration measurement system can determine the first vibration level and second vibration level of the measurement object on the same scale even if the apparent size of the measurement object in the first image and the second image, i.e., the apparent distance to the measurement object, is different.

[0094] (8) According to an eighth aspect of the present disclosure, the vibration measuring system (1) according to the seventh aspect further includes an air blower (4) that blows air to the first area and the second area of ​​the measurement object (90).

[0095] By doing this, the vibration measurement system is able to suppress temperature fluctuations in the first and second areas where the vibration of the measurement object is measured, even if fluctuations due to high temperatures occur around the measurement object.

[0096] (9) According to a ninth aspect of the present disclosure, a vibration measurement method includes the steps of acquiring a first image capturing a first region including a horizontally facing surface of a cylindrical measurement object (90) and a second image capturing a second region including a vertically facing surface of the measurement object (90); measuring a first vibration level indicating the vibration level of the measurement object (90) in the vertical direction based on the first image and measuring a second vibration level indicating the vibration level of the measurement object (90) in the horizontal direction based on the second image; and correcting the first vibration level and the second vibration level based on the ratio between the axial width of the measurement object (90) in the first image and the second image, respectively, and the actual axial width of the measurement object (90).

[0097] (10) According to a tenth aspect of the present disclosure, the program causes the vibration measuring device (10) to execute the steps of acquiring a first image capturing a first region including a horizontally facing surface of a cylindrical measurement object (90) and a second image capturing a second region including a vertically facing surface of the measurement object (90); measuring a first vibration level indicating the vibration level of the measurement object (90) in the vertical direction based on the first image and measuring a second vibration level indicating the vibration level of the measurement object (90) in the horizontal direction based on the second image; and correcting the first vibration level and the second vibration level based on the ratio between the axial width of the measurement object (90) in the first image and the second image, respectively, and the actual axial width of the measurement object (90). [Explanation of symbols]

[0098] 1. Vibration measurement system 2, 20a, 20b mirror 21a, 21b Auxiliary mirror 3 Camera 4. Blower 10 Vibration measuring device 11 processors 110 Image acquisition unit 111 Measurement Unit 112 Correction unit 12 Memory 13. Storage 14 Communication Interface 15 Display device 16 Input Devices

Claims

1. A vibration measuring device that measures vibrations of a measurement target having a cylindrical shape, an image acquisition unit that acquires a first image obtained by capturing a first region including a surface of the measurement object facing a horizontal direction and a second image obtained by capturing a second region including a surface of the measurement object facing a vertical direction; a measurement unit that measures a first vibration level indicating a vibration level of the measurement object in the vertical direction based on the first image, and measures a second vibration level indicating a vibration level of the measurement object in the horizontal direction based on the second image; a correction unit that corrects the first vibration level and the second vibration level based on a ratio between an axial width of the measurement object in each of the first image and the second image and an actual axial width of the measurement object; Equipped with The measurement unit a first measurement point that is a measurement point of the measurement object included in the first image, a first fixed point that is a point on a stationary member included in the first image, a second measurement point that is a measurement point of the measurement object included in the second image, and a second fixed point that is a point on the stationary member included in the second image; measuring the first vibration level of the measurement object from the relative displacement between the first measurement point and the first fixed point detected from the first image, and measuring the second vibration level of the measurement object from the relative displacement between the second measurement point and the second fixed point detected from the second image; Vibration measurement device.

2. The measurement unit sets the first measurement point and the first fixed point in the first image, and the second measurement point and the second fixed point in the second image based on a user's designation. The vibration measuring device according to claim 1 .

3. The measurement unit detects the measurement object and the stationary side member from the first image by image processing and automatically sets the first measurement point and the first fixed point, and detects the measurement object and the stationary side member from the second image by image processing and automatically sets the second measurement point and the second fixed point. The vibration measuring device according to claim 1 .

4. the image acquisition unit acquires an image including the first image and the second image from a camera that simultaneously captures an image of the measurement target reflected in a mirror facing one of the first area and the second area and the measurement target in the other of the first area and the second area. The vibration measuring device according to any one of claims 1 to 3.

5. the image acquisition unit acquires an image including the first image and the second image from a camera that simultaneously captures an image of the measurement target reflected in a mirror facing one of the first area and the second area and an image of the measurement target reflected in a mirror facing the other of the first area and the second area. The vibration measuring device according to any one of claims 1 to 3.

6. the correction unit further corrects the first vibration level based on a tilt of the optical axis of the camera with respect to the horizontal direction or a tilt of the direction in which the mirror faces with respect to the horizontal direction. The vibration measuring device according to claim 4 or 5.

7. the correction unit further corrects the second vibration level based on a tilt of the optical axis of the camera with respect to the vertical direction or a tilt of the direction in which the mirror faces with respect to the vertical direction. The vibration measuring device according to any one of claims 4 to 6.

8. A vibration measurement system for measuring vibrations of a measurement target having a cylindrical shape, an image acquisition unit that acquires a first image obtained by capturing a first region including a surface of the measurement object facing a horizontal direction and a second image obtained by capturing a second region including a surface of the measurement object facing a vertical direction; a measurement unit that measures a first vibration level indicating a vibration level of the measurement object in the vertical direction based on the first image, and measures a second vibration level indicating a vibration level of the measurement object in the horizontal direction based on the second image; a correction unit that corrects the first vibration level and the second vibration level based on a ratio between an axial width of the measurement object in each of the first image and the second image and an actual axial width of the measurement object; Equipped with The measurement unit a first measurement point that is a measurement point of the measurement object included in the first image, a first fixed point that is a point on a stationary member included in the first image, a second measurement point that is a measurement point of the measurement object included in the second image, and a second fixed point that is a point on the stationary member included in the second image; measuring the first vibration level of the measurement object from the relative displacement between the first measurement point and the first fixed point detected from the first image, and measuring the second vibration level of the measurement object from the relative displacement between the second measurement point and the second fixed point detected from the second image; Vibration measurement system.

9. further comprising an air blower that blows air to the first area and the second area of ​​the measurement target, The vibration measurement system according to claim 8 .

10. A vibration measurement method for measuring vibrations of a measurement target having a cylindrical shape, comprising: acquiring a first image obtained by capturing a first region of the measurement object including a surface facing in a horizontal direction, and a second image obtained by capturing a second region of the measurement object including a surface facing in a vertical direction; measuring a first vibration level indicating a vibration level of the measurement object in the vertical direction based on the first image, and measuring a second vibration level indicating a vibration level of the measurement object in the horizontal direction based on the second image; correcting the first vibration level and the second vibration level based on a ratio between an axial width of the measurement object in each of the first image and the second image and an actual axial width of the measurement object; and The step of measuring the first vibration level and the second vibration level includes: a first measurement point that is a measurement point of the measurement object included in the first image, a first fixed point that is a point on a stationary member included in the first image, a second measurement point that is a measurement point of the measurement object included in the second image, and a second fixed point that is a point on the stationary member included in the second image; measuring the first vibration level of the measurement object from the relative displacement between the first measurement point and the first fixed point detected from the first image, and measuring the second vibration level of the measurement object from the relative displacement between the second measurement point and the second fixed point detected from the second image; Vibration measurement methods.

11. A vibration measuring device for measuring vibrations of a cylindrical measurement target, acquiring a first image obtained by capturing a first region of the measurement object including a surface facing in a horizontal direction, and a second image obtained by capturing a second region of the measurement object including a surface facing in a vertical direction; measuring a first vibration level indicating a vibration level of the measurement object in the vertical direction based on the first image, and measuring a second vibration level indicating a vibration level of the measurement object in the horizontal direction based on the second image; correcting the first vibration level and the second vibration level based on a ratio between an axial width of the measurement object in each of the first image and the second image and an actual axial width of the measurement object; A program for executing The step of measuring the first vibration level and the second vibration level includes: a first measurement point that is a measurement point of the measurement object included in the first image, a first fixed point that is a point on a stationary member included in the first image, a second measurement point that is a measurement point of the measurement object included in the second image, and a second fixed point that is a point on the stationary member included in the second image; measuring the first vibration level of the measurement object from the relative displacement between the first measurement point and the first fixed point detected from the first image, and measuring the second vibration level of the measurement object from the relative displacement between the second measurement point and the second fixed point detected from the second image; program.

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