JP7305854B2 - Detection system and detection method - Google Patents

Description

TECHNICAL FIELD Embodiments of the present invention relate to detection systems, detection methods, and server devices.

2. Description of the Related Art A so-called non-destructive inspection technique is known for detecting damage to a structure without destroying the structure to be inspected (object to be inspected). With the recent development of information technology, there is a growing demand for so-called monitoring technology, which detects damage while operating the original functions of structures. As one of them, the acoustic emission (AE) method that detects the occurrence of internal cracks or the elastic waves generated as the internal cracks progress with a high-sensitivity sensor is used to detect structural damage. It has been known.

Japanese Patent No. 4874406 Special Table 2008-536756

However, in the prior art, there were cases where damage could not be detected with a simple configuration without impairing the functions of the object to be inspected.

A detection system according to an embodiment includes a base member, a plurality of sensors, and a detection unit. The plurality of sensors are members that connect the plurality of objects to be inspected and the base member, and are propagated through one or more connection members having a thickness smaller than the wavelength of the elastic waves generated from the plurality of objects to be inspected. Detects elastic waves. The detector detects anomalies in the plurality of inspected objects based on the detected elastic waves.

1 is a schematic configuration diagram of a detection system according to this embodiment; FIG. FIG. 2 is a block diagram showing the functional configuration of the detection system of this embodiment; FIG. 4 is a diagram for explaining an example of a position specifying method according to this embodiment; FIG. 4 is a diagram for explaining an example of a position specifying method according to the embodiment; FIG. 4 is a diagram for explaining an example of a position specifying method according to the embodiment; 4 is a sequence diagram of detection processing according to the embodiment; FIG. FIG. 4 is a diagram showing an example of a cross-sectional shape of a connection member; The figure which shows the other example of schematic structure of the detection system of this embodiment. The figure which shows the other example of schematic structure of the detection system of this embodiment. The figure which shows the other example of schematic structure of the detection system of this embodiment. Contour diagram showing energy distribution. The figure which shows the other example of schematic structure of the detection system of this embodiment. FIG. 2 is a hardware configuration diagram of the signal processing device according to the embodiment; FIG. 2 is a hardware configuration diagram of a server device according to the embodiment;

Preferred embodiments of the detection device according to the present invention will be described in detail below with reference to the accompanying drawings.

Acoustic emissions are elastic waves generated as fatigue cracks develop in materials. In the AE method, this elastic wave is detected as a voltage signal (AE signal) by an AE sensor using a piezoelectric element. Since the AE signal is detected as a sign before material fracture occurs, the occurrence frequency and signal intensity of the AE signal are useful as indicators of the soundness of the material. For this reason, research is actively being conducted on techniques for detecting signs of deterioration of structures using the AE method. In particular, the AE method detection technology is widely used in the corrosion diagnosis of oil tanks, the manufacturing process of machinery, and the like, and the standardization of the AE method detection technology is also underway.

In addition, as one of the techniques used in the AE method, there is a technique (localization technique) that uses multiple sensors to identify the position of the source by detecting the time difference of the elastic waves that reach each sensor. Are known.

A plurality of inspected objects whose damage (abnormalities) are to be detected usually exist in a three-dimensional space as part of an element that performs a predetermined function in some system. Also, its position in space is generally restricted by the system. In order to identify the position of a damaged inspection object among multiple inspection objects, a configuration in which a sensor is directly installed on each of the multiple inspection objects is conceivable. However, in such a configuration, if the object to be inspected has a movable part, the installation of the sensor may affect the operation of the movable part. Furthermore, since a sensor is installed for each of a plurality of objects to be inspected, the configuration becomes complicated and the cost increases.

Also, a configuration is conceivable in which a plurality of sensors are installed at locations separated by a certain distance, and the position of the damaged object to be inspected is identified by a position locating technique. However, in such a configuration, the elastic wave propagation path from the object to the sensor depends on the structure of the system and is generally complicated. Furthermore, it is extremely difficult to correctly locate the source if there is a structure in the path that impedes the propagation of the acoustic wave.

The detection system according to this embodiment is installed on the connection member via a member (connection member) having a thickness smaller than the wavelength of the elastic wave to be detected and a member (base member) provided with a plurality of sensors. An elastic wave generated from an object to be inspected is detected. By using a connecting member whose thickness is smaller than the wavelength, the wave propagating through the connecting member becomes a so-called guided wave and propagates with little attenuation. Therefore, for example, even if the number of sensors is smaller than the number of objects to be inspected, the position of the generation source of the elastic wave (the connection position between the connection member to which the damaged object to be inspected is connected and the base member) can be determined with high accuracy. can be specified. In addition, since there is no need to install the sensor directly on the object to be inspected, the possibility of impairing the functions of the object to be inspected can be reduced. That is, it is possible to detect damage with a simple configuration without impairing the function of the object to be inspected.

FIG. 1 is a diagram showing an example of a schematic configuration of a detection system according to this embodiment. FIG. 1 shows a state in which a plurality of inspected objects 11a to 11c exist in space. The objects to be inspected 11a to 11c are parts having movable parts, for example, and are part of elements of a system (not shown). The inspection objects 11a to 11c may simply be referred to as inspection objects 11 when there is no need to distinguish between them. Examples of the inspected object 11 include a bearing attached to a roller for conveying a sheet-like member.

The objects to be inspected 11a-11c are connected to the base member 10 by connecting members 12a-12c, respectively. The base member 10 is, for example, a plate-like member. As the base member 10, a planar member, a curved member, or the like can be used. Also, the base member 10 does not have to be an independent plate surface, and a relatively flat portion of a sphere or other three-dimensional body can be used as the base member 10 .

The thickness of the base member 10 may be smaller than the wavelength of the elastic wave. As a result, it is possible to excite guided waves radially propagating with little attenuation using the contact points between the connection members 12a to 12c and the base member 10 as a wave generation source, thereby improving the signal-to-noise ratio (SN ratio) of signal detection. becomes.

Sensors 3 a to 3 d are provided on the base member 10 to detect vibrations (elastic waves) propagating on the base member 10 . Since the sensors 3a to 3d have the same configuration, they may simply be referred to as the sensor 3 when there is no need to distinguish them. The number of sensors 3 is not limited to four, and may be two, three, or five or more.

A piezoelectric element having sensitivity in the range of 10 kHz to 1 MHz, for example, is used for the sensor 3 . The sensor 3 may be of a resonance type having a resonance peak within a frequency range, or a broadband type with suppressed resonance, but any type may be used. Moreover, the sensor 3 may incorporate a preamplifier. Methods for detecting elastic waves by the sensor 3 include a voltage output type, a resistance change type, an electrostatic capacity type, and the like, and any detection method may be used.

The connection members 12a to 12c are members that connect the object 11 to be inspected and the base member 10, and may be rod-shaped members, for example. Since the connection members 12a to 12c have the same configuration, they may simply be referred to as the connection member 12 when there is no need to distinguish them.

The connection member 12 has a solid structure having a thickness (diameter) smaller than the wavelength of the target elastic wave, or a hollow structure having an outer shell having a thickness (plate thickness) smaller than the wavelength of the elastic wave. of materials are available. By making the thickness smaller than the wavelength, the wave traveling through the connecting member 12 becomes a so-called guided wave and propagates in the longitudinal direction of the connecting member 12 with little attenuation. The guided wave propagated in the longitudinal direction is converted into a wave propagating through the base member 10 using the contact portion with the base member 10 as a new wave generation source.

Waves propagating through the base member 10 reach the plurality of sensors 3a to 3d with a time difference corresponding to the distance. The position of the source on the base member 10 can be identified by using the time difference and information on the propagation velocity of the elastic wave. What is specified at this time is the contact position (contact portion) between the base member 10 and the connection member 12 . In addition, the presence or absence of damage can be determined based on the number of elastic wave sources and the characteristics of the waveform.

The connection member 12 and the inspection object 11 are associated, for example, one-to-one. By specifying the contact position of the connection member 12, the damaged inspected object 11 can be specified at the same time. A plurality of inspection objects 11 may be associated with one connection member 12 . For example, a plurality of inspected objects 11 may be arranged coaxially with respect to one connecting member 12 . In that case, it is detected that any one of the plurality of inspected objects 11 arranged on the connecting member 12 is damaged with respect to the specified one contact position between the base member 10 and the connecting member 12. can.

FIG. 2 is a diagram showing an example of the functional configuration of the detection system of this embodiment. The detection system of this embodiment includes sensors 3 a to 3 d, a signal processing device 100 and a server device 200 . Signal processing apparatus 100 includes generation section 101 and communication control section 102 . The server device 200 includes a communication control section 201 , a detection section 202 , an output control section 203 and a storage section 221 .

Sensors 3a to 3d detect elastic waves generated from an object to be inspected. When detecting the elastic wave, the sensor 3 converts the elastic wave into a detection signal such as a voltage signal. The sensor 3 inputs a detection signal to the signal processing device 100 .

The signal processing device 100 may have a function of amplifying the detection signal received from the sensor 3 . If the sensor 3 has a built-in amplifier, the amplification process by the signal processing device 100 may be omitted.

The generation unit 101 generates information used in damage detection processing by the detection unit 202 of the server device 200 from the detection signal received from the sensor 3 . The generation unit 101 converts the data format of the detection signal from analog format to digital format. When the detection signal converted into a digital format is equal to or higher than the detection threshold, the generation unit 101 generates time information indicating the time when the detection signal was detected and feature amount information indicating the characteristics of the detection signal.

The feature information includes, for example, the amplitude [mV] of the waveform of the detection signal, the duration of the waveform of the detection signal [usec], the number of zero cross counts of the detection signal [times], the energy of the waveform of the detection signal [arb. ], and the frequency [Hz] of the detection signal.

The communication control unit 102 controls communication with external devices such as the server device 200 . For example, when the communication control unit 102 receives the feature amount information and the time information from the generation unit 101 , the communication control unit 102 transmits the feature amount information and the time information to the server device 200 .

A communication control unit 201 of the server device 200 controls communication with an external device such as the signal processing device 100 . For example, the communication control unit 201 receives feature amount information and time information from the signal processing device 100 (receiving unit). The communication control unit 201 stores the received feature amount information and time information in the storage unit 221, for example.

The detection unit 202 reads the feature amount information and the time information from the storage unit 221, and uses the feature amount information and the time information to determine the connection position between the connection member to which the damaged inspection object is connected and the base member. detect. The detection unit 202 may diagnose the degree of damage of the damaged portion using, for example, feature amount information.

The storage unit 221 stores various information used in each process by the server device 200 . For example, the storage unit 221 stores feature amount information and time information received from the signal processing device 100 . The storage unit 221 can be composed of any commonly used storage medium such as flash memory, memory card, RAM (Random Access Memory), HDD (Hard Disk Drive), and optical disc.

The output control unit 203 controls the output of processing results of each processing by the server device 200 . For example, the output control unit 203 outputs (displays) the detection result of the detection unit 202 to a display device (not shown) or the like. The output method by the output control unit 203 is not limited to this, and any output method may be used. For example, the output control unit 203 may transmit the detection result to a designated output destination device (such as a device used by an administrator) via a network (such as the Internet).

Note that the configuration of the detection system shown in FIG. 2 is an example, and may be changed as appropriate. For example, the functions of the server device 200 (the detection unit 202 and the like) may be provided within the signal processing device 100 .

Next, the wavelength of elastic waves will be described. Materials used for mechanical parts are generally known to generate elastic waves as internal damage progresses. Elastic waves are generated as the damage develops in the object to be inspected.

Here, the propagation velocity v of an elastic wave propagating through a material is given by the following formula (1), where κ (Pa) is the bulk elastic modulus of the material (material) and ρ ₀ (kg/m ³ ) is the density. can be expressed as

Further, in the case of a three-dimensional object, the shear elastic modulus is represented by the following formula (2).

In other words, the propagation velocity v of the elastic wave propagating through the material is determined by the physical properties unique to the material. Elastic waves (AE waves) generated by damage have frequency components of about 100 kHz to 1 MHz for metal materials and about 10 kHz to 50 kHz for concrete. That is, the wavelength of the target elastic wave is generally determined by the material of the target member.

Therefore, the thickness of the connecting member 12 and the base member 10 can be determined according to the wavelength of the elastic wave determined by the material of the test object.

Next, a position specifying method using elastic waves detected by the sensor 3 will be described. FIG. 3 is a diagram (in the case of one dimension) for explaining an example of the position specifying method of this embodiment. In this case, at least two sensors 3a, 3b should be provided.

A case will be described below in which a crack occurs in the object to be inspected between the sensors 3a and 3b and the sensors 3a and 3b detect elastic waves caused by the crack. Let l be the distance between sensor 3a and sensor 3b. Also, let Δx be the distance from the midpoint between the sensor 3a and the sensor 3b to the crack. When the sensor 3b detects an elastic wave after T seconds and the sensor 3a detects an elastic wave after T+Δt seconds, the time difference information Δt can be expressed by the following equation (3).

The time difference information Δt can be calculated, for example, from feature amount information and time information corresponding to the detection signal from each sensor 3 . For example, the time difference information Δt can be calculated from the difference in time information corresponding to similar feature amount information. Therefore, if the distance l between the sensor 3a and the sensor 3b and the propagation velocity v of the elastic wave are known, from the calculated time difference information Δt and the equation (3), the crack The distance Δx to can be calculated. That is, the detection unit 202 can identify the position information of the crack (elastic wave generation source) from the time difference information Δt.

Next, the two-dimensional case will be briefly described. 4 and 5 are diagrams (two-dimensional case) for explaining an example of the position specifying method in this embodiment. FIG. 4 shows an example in which a crack occurs in an object to be inspected and elastic waves caused by the crack reach the sensors 3a to 3d at a propagation velocity v [m/s]. At this time, the times at which the elastic waves reach the sensors 3a to 3d are different for each of the sensors 3a to 3d. Once the time difference between the reception times of the elastic waves is known, as shown in FIG. Tc) and the source of the elastic wave on the circumference ARC_d (radius Td). That is, the detection unit 202 can identify the intersections of the circumferences ARC_a to ARC_d as the positional information of the source of the elastic wave.

In general, the position of the elastic wave generation source can be specified by using the sensor 3 having the number of dimensions +1. Therefore, in the three-dimensional case, by using at least four sensors 3, the position of the source of the elastic waves can be specified. In addition, as the number of sensors 3 increases, the accuracy of specifying position information can be improved.

Next, damage detection processing by the detection system according to this embodiment will be described. FIG. 6 is a sequence diagram showing an example of detection processing in this embodiment.

When detecting an elastic wave, the sensor 3 transmits an AE signal to the signal processing device 100 (step S101). The signal processing device 100 (generation unit 101) generates feature amount information and time information from the AE signal (step S102). The signal processing device 100 (communication control unit 102) transmits the generated feature amount information and time information to the server device 200 (step S103). The server device 200 (detection unit 202) uses the transmitted feature amount information and time information to determine the position of the contact portion between the connection member 12 and the base member 10 corresponding to the inspection object in which the abnormality (damage) has occurred. Detect (step S104). After that, the output control unit 203 may output the detection result to a display device or the like.

Next, the shape of the connection member 12 will be described. FIG. 7 is a diagram showing an example of the cross-sectional shape of the connecting member 12. As shown in FIG. Sections 701 to 705 show examples of sections when the connecting member 12 has a solid structure. Cross sections 701 to 705 respectively show examples in which the cross-sectional shape of the connection member 12 is a circle, equilateral triangle, regular quadrangle, regular pentagon, and regular hexagon. For example, it is possible to use a connection member 12 whose thickness is the maximum value among the diameter of a circle, the height of a triangle, and the length of a diagonal line of a polygon, and whose thickness is smaller than the wavelength of the elastic wave.

Sections 711 to 715 show examples of sections when the connection member 12 has a hollow structure. Cross sections 711 to 715 show examples in which the cross-sectional shapes of the hollow portion of the connecting member 12 and the outer shell portion surrounding the hollow portion are a circle, an equilateral triangle, a regular quadrangle, a regular pentagon, and a regular hexagon. A connection member 12 can be used in which the thickness of the outer shell is smaller than the wavelength of the elastic wave.

Cross sections 721 and 722 show examples of cross sections in the case where a member used for railway rails or the like is used as the connection member 12 .

The shape of the connection member 12 is not limited to the example shown in FIG. 7, and may be any shape as long as the thickness is smaller than the wavelength of the elastic wave. For example, a connection member 12 having an elliptical cross-sectional shape and a polygonal cross-sectional shape other than those shown in FIG. 7 including triangles, quadrilaterals, pentagons, and hexagons may be used. Moreover, the connection member 12 may have a shape in which at least a portion thereof is bent, or may be a member that is not rod-shaped.

Next, application examples other than those shown in FIG. 1 will be described. 8, 9-1, 9-2 and 11 are diagrams showing other examples of the schematic configuration of the detection system of this embodiment.

FIG. 8 shows an example in which bearings 51a to 51c of rollers for conveying a belt-shaped sheet 53 are used as inspection objects. FIG. 8 shows, for example, a state in which a plurality of bearings 51a to 51c, which are objects to be inspected, exist in space. Bearings 51a-51c are part of an element of a belt transport system, not shown. Each of the bearings 51a-51c and the base member 50 are connected by connecting members 52a-52c. The connection members 52a to 52c are, for example, solid round bars of φ20 mm.

The bearings 51a to 51c may simply be referred to as bearings 51 when there is no need to distinguish between them. The connection members 52a to 52c may simply be referred to as the connection member 52 when there is no need to distinguish between them. As in FIG. 1, a plurality of bearings 51 may be coaxially arranged with respect to one connecting member 52 .

The connection member 52 and the base member 50 are connected by screw fastening, for example. The connection method is not limited to screw fastening, and may be welding or adhesion. A coupling member may be present between the connection member 52 and the base member 50 to promote propagation of elastic waves.

When an elastic wave is generated by damage to the bearing 51 , the elastic wave propagates through the connecting member 52 . By using a member with a solid structure having a diameter smaller than the wavelength of the target elastic wave as the connection member 52, the wave propagating through the connection member 52 becomes a so-called guided wave, and travels in the longitudinal direction of the connection member 52 with little attenuation. Propagate. The guided wave propagating in the longitudinal direction is converted into a wave propagating through the base member 50 using the contact portion with the base member 50 as a new wave generation source.

By configuring as shown in FIG. 8, the damaged bearing 51 can be detected while operating the belt conveying system including the bearing 51 without affecting the original belt conveying function of the bearing 51, which is the object to be inspected. becomes possible.

FIGS. 9-1 and 9-2 show other examples of bearings to be inspected. FIG. 9-1 shows a side view of the detection system. FIG. 9-2 shows a top view of the sensing system. In the examples of FIGS. 9-1 and 9-2, four bearings 51a-51d are the objects to be inspected. In the following it is assumed that the bearing 51d is damaged.

The connecting members 52a to 52d are solid round bars of φ20 mm, for example, and are screw-fastened to the base member 50 to which bearings 51a to 51d are attached.

Sensors 3 a to 3 d are arranged at the four corners of base member 50 .

When the bearings 51a to 51d rotate, elastic waves are generated from the damaged bearing 51d. The elastic waves propagate to the base member 50 via the connecting member 52d and reach the sensors 3a-3d. For example, the detection unit 202 can calculate the position of the generation source on the base member 50 from the difference in the arrival times of the elastic waves at the sensors 3a to 3d.

Further, the detection unit 202 can obtain the energy distribution on the base member 50 based on the energy of the signals detected by the sensors 3a to 3d. FIG. 10 is an example of a contour diagram showing energy distribution. FIG. 10 shows that the lower right area containing a lot of white has higher energy than other areas. In this way, the position of the large energy on the base member 50 and the position of the damaged inspected object are well matched. This indicates that the damaged inspection object can be detected.

FIG. 11 shows an example in which pipe joints 61a to 61c, which are members for connecting pipes, are used as inspected objects. FIG. 11 shows a state in which a plurality of pipe joints 61a to 61c, which are objects to be inspected, exist in space. Piping joints 61a-61c are part of a piping system element not shown. The piping joints 61a-61c and the base member 60 are connected by connecting members 62a-62c. The connection members 62a to 62c are, for example, hollow pipes of φ20 mm.

If it is not necessary to distinguish between pipe joints 61a-61c, simply It is sometimes referred to as a piping joint 61 . The connection members 62a to 62c may simply be referred to as the connection member 62 when there is no need to distinguish between them. A plurality of pipe joints 61 may be arranged for one connecting member 62, as in FIG.

The connection member 62 and the base member 60 are connected, for example, by screw fastening via a flange. The connection method is not limited to screw fastening, and may be welding or adhesion. A coupling member may be present between the connection member 62 and the base member 60 to promote propagation of elastic waves.

When an elastic wave is generated due to damage to the pipe joint 61 , the elastic wave propagates through the connection member 62 . By using a member with a hollow structure having a thickness smaller than the wavelength of the target elastic wave as the connecting member 62, the wave propagating through the connecting member 62 becomes a so-called guided wave, and travels in the longitudinal direction of the connecting member 62 with little attenuation. Propagate. The guided wave propagating in the longitudinal direction is converted into a wave propagating through the base member 60 using the contact portion with the base member 60 as a new wave source.

By configuring as shown in FIG. 11, the damaged piping joint 61 can be detected while operating the piping system including the piping joint 61 without affecting the original function of the piping joint 61, which is the object to be inspected. becomes possible. Although the piping joint 61 has been described as the object to be inspected, the connecting member 62 itself, which is a pipe, may be the object to be inspected.

As described above, according to this embodiment, it is possible to detect damage with a simple configuration without impairing the functions of the object to be inspected.

Next, an example of the hardware configuration of each device (the signal processing device 100 and the server device 200) of this embodiment will be described.

FIG. 12 is a diagram showing an example of the hardware configuration of the signal processing device 100 of this embodiment. The signal processing device 100 of this embodiment includes a control device 501 , a main memory device 502 , an auxiliary memory device 503 and a communication I/F (interface) 504 . Control device 501 , main storage device 502 , auxiliary storage device 503 and communication I/F 504 are connected via bus 505 .

The control device 501 is a device such as a CPU (Central Processing Unit) that executes a program read from the auxiliary storage device 503 to the main storage device 502 . The main storage device 502 is memory such as ROM (Read Only Memory) and RAM. The auxiliary storage device 503 is a memory card or the like.

A communication I/F 504 is an interface for communicating with the server apparatus 200 and the like.

The program executed by the signal processing device 100 of the present embodiment is a file in an installable format or an executable format, and can be read by a computer such as a CD-ROM, a memory card, a CD-R, and a DVD (Digital Versatile Disc). and provided as a computer program product.

Alternatively, the program executed by the signal processing apparatus 100 of this embodiment may be stored in a computer connected to a network such as the Internet, and may be provided by being downloaded via the network. Alternatively, the program executed by the signal processing apparatus 100 of this embodiment may be provided via a network such as the Internet without being downloaded.

Alternatively, the program of the signal processing apparatus 100 of the present embodiment may be configured so as to be pre-installed in a ROM or the like and provided.

A program executed by the signal processing apparatus 100 of the present embodiment has a module configuration including functional blocks that can be implemented by a program among the functional blocks of the signal processing apparatus 100 shown in FIG. 2 described above. As actual hardware, each functional block is loaded onto the main storage device 502 by the control device 501 reading out a program from a storage medium and executing the program. That is, each functional block described above is generated on the main storage device 502 .

Some or all of the functional blocks described above may be implemented by hardware such as an IC (Integrated Circuit) instead of by software.

Further, when each function is implemented using a plurality of processors, each processor may implement one of each function, or two or more of each function.

FIG. 13 is a diagram showing an example of the hardware configuration of the server device 200 of this embodiment. The server device 200 of this embodiment includes a control device 601 , a main memory device 602 , an auxiliary memory device 603 , a display device 604 , an input device 605 and a communication I/F 606 . Control device 601 , main storage device 602 , auxiliary storage device 603 , display device 604 , input device 605 and communication I/F 606 are connected via bus 607 .

The control device 601 is a device such as a CPU that executes a program read from the auxiliary storage device 603 to the main storage device 602 . The main storage device 502 is memory such as ROM and RAM. Auxiliary storage device 603 is an HDD, a memory card, or the like. The storage unit 221 in FIG. 2 corresponds to the main storage device 602 and the auxiliary storage device 603, for example.

A display device 604 displays the status of the server device 200 and the like. The display device 604 is, for example, a liquid crystal display. The input device 605 is an interface for operating the server device 200 . The input device 605 is, for example, a keyboard, mouse, or the like. When the server device 200 is a smart device such as a smart phone and a tablet terminal, the display device 604 and the input device 605 are touch panels, for example. A communication I/F 606 is an interface for communicating with the signal processing apparatus 100 and the like.

The program executed by the server device 200 of this embodiment is recorded in a computer-readable storage medium such as a CD-ROM, a memory card, a CD-R, a DVD, or the like as an installable or executable file. provided as a computer program product.

Alternatively, the program executed by the server device 200 of this embodiment may be stored in a computer connected to a network such as the Internet, and may be provided by being downloaded via the network. Alternatively, the program executed by the server apparatus 200 of this embodiment may be provided via a network such as the Internet without being downloaded.

Further, the program of the server device 200 of the present embodiment may be configured so as to be pre-installed in a ROM or the like and provided.

The program executed by the server device 200 of this embodiment has a module configuration including functional blocks that can be implemented by the program among the functional blocks of the server device 200 in FIG. 2 described above. As actual hardware, each functional block is loaded onto the main storage device 602 by the control device 601 reading out a program from a storage medium and executing the program. That is, each functional block described above is generated on the main memory device 602 .

Some or all of the functional blocks in FIG. 2 described above may be implemented by hardware such as an IC instead of by software.

Further, when each function is implemented using a plurality of processors, each processor may implement one of each function, or two or more of each function.

Further, the operation mode of the server apparatus 200 of this embodiment may be arbitrary. The server device 200 of this embodiment may be operated as, for example, a cloud system on a network.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

The invention described in the scope of claims at the time of filing of the original application of the present application is additionally described below.
[1]
a base member;
A member connecting a plurality of objects to be inspected and the base member, wherein the elastic waves propagated through a plurality of connecting members having a thickness smaller than the wavelength of the elastic waves generated from the plurality of objects to be inspected are transmitted. a plurality of sensors provided on the base member for sensing;
a detection unit that detects an abnormality in a plurality of the objects to be inspected based on the detected elastic waves;
detection system.
[2]
The connection member has a solid structure with a thickness smaller than the wavelength, or a hollow structure with an outer shell thickness smaller than the wavelength.
The detection system according to [1].
[3]
the thickness of the base member is less than the wavelength;
The detection system according to [1].
[4]
each of the plurality of connecting members connects one of the plurality of inspected objects to the base member;
The detection system according to [1].
[5]
At least one of the plurality of connecting members connects two or more of the plurality of inspected objects to the base member,
The detection system according to [1].
[6]
The plurality of inspected objects are bearings installed in the connection member,
The detection system according to [1].
[7]
The connection member is a pipe,
The plurality of inspected objects are members that connect the pipes to other members,
The detection system according to [1].
[8]
The detection unit identifies a connection position between the base member and the connection member to which the inspected object having the abnormality is connected, based on the difference in time when the elastic waves reach the plurality of sensors.
The detection system according to [1].
[9]
A member connecting a plurality of objects to be inspected and a base member, wherein the elastic wave is propagated through one or more connecting members having a thickness smaller than the wavelength of the elastic waves generated from the plurality of objects to be inspected. is detected by a plurality of sensors provided on the base member;
a step of detecting anomalies in a plurality of the inspected objects based on the detected elastic waves;
detection methods, including
[10]
A member connecting a plurality of objects to be inspected and a base member, wherein the elastic wave is propagated through one or more connecting members having a thickness smaller than the wavelength of the elastic waves generated from the plurality of objects to be inspected. a receiving unit for receiving detection information of the elastic wave from a plurality of sensors provided on the base member, which detects
a detection unit that detects an abnormality in a plurality of the objects to be inspected based on the detected elastic waves;
A server device comprising

3a to 3d sensors 10, 50, 60 base members 11a to 11c objects to be inspected 12a to 12c, 52a to 52d, 62a to 62c connection members 51a to 51d bearings 61a to 61c piping joint 100 signal processing device 101 generation unit 102 communication control unit 200 server device 201 communication control unit 202 detection unit 203 output control unit 221 storage unit

Claims (8)

a base member;
A member connecting a plurality of objects to be inspected and the base member , wherein the elastic wave is propagated through a plurality of connection members having a thickness smaller than the wavelength of the elastic waves generated from the plurality of objects to be inspected. a plurality of sensors provided on the base member for detecting
a detection unit that detects an abnormality in a plurality of the objects to be inspected based on the detected elastic waves;
with
the thickness of the base member is less than the wavelength;
detection system. The connection member has a solid structure with a thickness smaller than the wavelength, or a hollow structure with an outer shell thickness smaller than the wavelength.
The sensing system of claim 1. each of the plurality of connecting members connects one of the plurality of inspected objects to the base member;
The sensing system of claim 1. At least one of the plurality of connecting members connects two or more of the plurality of inspected objects to the base member,
The sensing system of claim 1. The plurality of inspected objects are bearings installed in the connection member,
The sensing system of claim 1. The connection member is a pipe,
The plurality of inspected objects are members that connect the pipes to other members,
The sensing system of claim 1. The detection unit identifies a connection position between the base member and the connection member to which the inspected object having the abnormality is connected, based on the difference in time when the elastic waves reach the plurality of sensors.
The sensing system of claim 1. A member connecting a plurality of objects to be inspected and a base member, wherein the elastic wave is propagated through one or more connecting members having a thickness smaller than the wavelength of the elastic waves generated from the plurality of objects to be inspected . is detected by a plurality of sensors provided on the base member;
a step in which a detection unit detects an abnormality in a plurality of the objects to be inspected based on the detected elastic waves;
including
the thickness of the base member is less than the wavelength;
Detection method.

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