JP2022142130A - Measurement device, measurement program, measurement method, and measurement system - Google Patents

Abstract

To provide a measurement device that can efficiently measure a structure with low installation cost.SOLUTION: A measurement device 10 having an acceleration sensor 11 comprises: (1) control means 13 for controlling the operation of an acceleration sensor based on predetermined measurement-period information; (2) communication means 16 for performing transmission and reception of data to and from another measurement device; (3) data holding means 12 for holding acceleration data measured by the acceleration sensor; (4) vibration detection means 14 for determining whether or not a vibration that matches a prescribed vibration-detection condition is included in the acceleration data; and (5) displacement calculation means 15 for calculating a displacement based on the acceleration data and extracting part of the information of the calculated displacement data, only when the vibration detection means detects the vibration that matches the vibration-detection condition.SELECTED DRAWING: Figure 1

Description

The present invention relates to a measuring device, a measuring program, a measuring method, and a measuring system, and can be applied, for example, to a measuring system that remotely measures the amount of displacement of a structure to be measured.

In recent years, various sensors have been installed on structures such as bridges to measure the deflection (live load displacement) of structures when vehicles such as trains and automobiles pass by, and are used to confirm safety and predict deterioration. Efforts are underway to

For example, in Patent Document 1, the displacement of the road surface while the vehicle is traveling is measured based on images of the road surface taken by a camera while the vehicle is traveling, and the axle load of the vehicle is obtained from the measured displacement to estimate structural deterioration. A method for doing so is disclosed.

In addition, in Patent Document 2, two types of sensors, a fixed type and a portable type, are installed in a structure, the displacement amount data detected by both sensors are collected, and the displacement of the structure is analyzed. A method is disclosed for estimating the damage and deterioration accumulated in the

International Publication No. 2018/159003 JP 2015-99073 A

By the way, the technologies described in Patent Documents 1 and 2 described above enable prediction of deterioration with high accuracy by adopting a configuration in which constant measurement is performed, but power supply work is required at the time of installation.

In this respect, the use of a battery-operated acceleration sensor terminal can reduce installation costs. However, there is a concern that the use of continuous measurement as described above consumes the battery capacity quickly and requires frequent battery replacement, which in turn increases costs.

Therefore, a measuring device, a measuring program, a measuring method, and a measuring system capable of efficiently measuring structures with low installation costs are desired.

A first aspect of the present invention is a measuring apparatus comprising an acceleration sensor, comprising: (1) control means for controlling the operation of the acceleration sensor based on predetermined measurement cycle information; and (2) data transmission/reception with another measuring apparatus. (3) data holding means for holding acceleration data measured by the acceleration sensor; and (4) vibration detection for determining whether or not the acceleration data includes vibration that meets predetermined vibration detection conditions. (5) displacement calculation means for calculating a displacement based on the acceleration data and extracting a part of the information from the calculated displacement data only when the vibration detection means detects a vibration that meets the vibration detection conditions; and

A measurement program according to a second aspect of the present invention provides a computer installed in a measurement device having an acceleration sensor, (1) control means for controlling the operation of the acceleration sensor based on predetermined measurement cycle information, and (2) other (3) data holding means for holding acceleration data measured by the acceleration sensor; and (4) the acceleration data including vibrations that meet predetermined vibration detection conditions. (4) displacement is calculated based on the acceleration data only when the vibration detection means detects a vibration that matches the vibration detection condition, and some information is obtained from the calculated displacement data; It is characterized by functioning as displacement calculation means for extracting .

A third aspect of the present invention is a measurement method used in a measurement apparatus having an acceleration sensor, comprising: (1) control means controlling the operation of the acceleration sensor based on predetermined measurement cycle information; and (2) communication means. (3) data holding means holds acceleration data measured by the acceleration sensor; (4) vibration detection means detects a predetermined vibration in the acceleration data; (5) the displacement calculation means calculates the displacement based on the acceleration data only when the vibration detection means detects the vibration that meets the vibration detection conditions; It is characterized by extracting a part of information from the displacement data.

A fourth aspect of the present invention is a measuring system having a plurality of measuring devices and a data collecting device for collecting data measured by each of the measuring devices, wherein each of the measuring devices is the measuring device of the first aspect of the present invention. is characterized by applying

According to the present invention, the installation cost is low and the measurement of the structure can be performed efficiently.

1 is an internal configuration diagram showing an internal configuration of a wireless communication device according to an embodiment; FIG. 1 is an overall configuration diagram showing the overall configuration of a data measurement system according to an embodiment; FIG. FIG. 4 is an explanatory diagram showing characteristic operations of the wireless communication device in the data measurement system according to the embodiment;

(A) Main Embodiments An embodiment of a measuring device, a measuring program, a measuring method, and a measuring system according to the present invention will be described in detail below with reference to the drawings.

(A-1) Configuration of Embodiment [Overall Configuration]
FIG. 2 is an overall configuration diagram showing the overall configuration of the data measurement system according to the embodiment.

In FIG. 2, the data measurement system 1 according to the embodiment has wireless communication devices 10 (10-1 to 10-n) as measurement devices, a base station 20, and a data collection device 30. FIG.

In FIG. 1, the network between each wireless communication device 10 and the base station 20 is a sensor network SN. In general, a low-speed wireless communication method such as a specified low-power wireless method can be applied to the communication method of the sensor network SN. For example, wireless network standards such as IEEE802.11a/b/g/n or wireless communication systems such as IEEE802.15.4 and Bluetooth (registered trademark) may be used. The sensor network SN uses a communication system that is slower than the backbone network NT.

A network between the base station 20 and the data collection device 30 is a backbone network NT. The backbone network NT is, for example, the Internet or Ethernet (registered trademark). The backbone network NT may be a wireless line or a wired line.

The data measurement system 1 is a system in which the data collection device 30 collects sensor data of each wireless communication device 10 via the base station 20 . The data measurement system 1 mainly includes wireless communication devices 10 , base stations 20 , and data collection devices 30 . Hereinafter, for convenience of explanation, the wireless communication device 10 and the base station 20 constituting the sensor network SN will be collectively referred to as "nodes".

[Wireless communication device]
The wireless communication device 10 mainly has sensors, displacement calculation means and communication means. In this embodiment, it is assumed that the wireless communication device 10 is fixed to a structure such as a bridge, for example.

The wireless communication device 10 measures the displacement within the measurement time and transmits only the maximum value of the displacement to the data collection device 30 (after reaching the base station 20 via the sensor network SN, via the backbone network NT and sent to the data collection device 30). The wireless communication device 10 can reduce the amount of communication compared to the case of transmitting all time-series data of acceleration (or displacement).

Further, the wireless communication device 10 performs displacement calculation and the like only when vibrations to be measured (such as vibrations caused by vehicle traffic) are detected. This can reduce wasted resource consumption. Then, the wireless communication device 10 exchanges information indicating that the vehicle passing has been detected and detection time information between nodes (between a plurality of sensors). This makes it possible to reduce erroneous detection of passing, or to reduce the amount of calculation by omitting the calculation of times when there is no vibration.

[base station]
The base station 20 has a function of relaying data between the sensor network SN and the backbone network NT. Upon receiving data from each wireless communication device 10 , the base station 20 transmits information including data of each wireless communication device 10 to the data collection device 30 . Thereby, measurement data can be given to the data collection device 30 .

[Data collection device]
The data collection device 30 collects information including measurement data (displacement data) from each wireless communication device 10 via the base station 20, and stores (accumulates and manages) each data. As a modification, the base station 20 and the data collection device 30 may be integrated.

[Internal configuration of wireless communication device]
FIG. 1 is an internal configuration diagram showing the internal configuration of a wireless communication device according to an embodiment.

In FIG. 1 , the wireless communication device 10 has an acceleration sensor 11 , a data storage unit 12 , a control unit 13 , a vibration detection unit 14 , a displacement calculation unit 15 , a communication unit 16 and a condition input unit 17 .

The radio communication apparatus according to the present embodiment may have each part configured by hardware, and a part of the configuration may be configured by software.

[Acceleration sensor]
The acceleration sensor 11 senses a physical quantity to be measured applied to a structure such as a bridge. The acceleration sensor 11 of this embodiment has at least one measurement axis and means for outputting acceleration data measured at a constant sampling cycle. The acceleration sensor 11 supplies the measured acceleration data to the data holding unit.

[Data holding part]
The data holding unit 12 temporarily holds acceleration data acquired from the acceleration sensor 11 . The acceleration data includes, for example, the numerical value of the acceleration measured by the acceleration sensor 11 and a time stamp. The time stamp is recorded based on the time synchronized with the other wireless communication device 10 held by the control unit 13. For example, one time stamp is recorded for each sample of acceleration data. or it may record the time of the first sample of the acceleration data and the sampling period.

When the vibration detection unit 14 requests acquisition of the acceleration data, the data holding unit 12 supplies the stored acceleration data to the vibration detection unit 14 . Similarly, when the displacement calculation unit 15 requests acquisition of acceleration data, the data holding unit 12 provides the stored acceleration data to the displacement calculation unit 15 .

After providing the acceleration data to the displacement calculation unit 15, the data holding unit 12 deletes the stored acceleration data. The data holding unit 12 also deletes the stored acceleration data when the control unit 13 requests deletion of the stored acceleration data.

[Control part]
The control unit 13 controls the acceleration sensor 11 (controls to operate and stop the acceleration sensor 11) according to the measurement cycle information set by the condition input unit 17. FIG.

It is assumed that the control unit 13 holds the time synchronized with the other wireless communication device 10 . The means for time synchronization is not limited, but information for synchronization may be exchanged with other wireless communication devices 10 . Time synchronization is performed by a protocol such as Network Time Protocol (NTP), for example.

When the measurement by the acceleration sensor 11 is completed, the control unit 13 requests the vibration detection unit 14 to detect vibration. When the vibration detection unit 14 notifies the control unit 13 of detection of vibration, the control unit 13 requests the communication unit 16 to transmit a vibration detection packet.

If the control unit 13 does not receive a vibration detection packet reception notification from another wireless communication device 10 even after the data holding time has elapsed after the measurement is completed, the control unit 13 requests the data holding unit 12 to delete the data. When receiving a notification of reception of a vibration detection packet transmitted by another wireless communication device 10, the control unit 13 gives the start time and end time of the detected vibration to the displacement calculation unit 15, and requests displacement calculation.

[Vibration detector]
The vibration detection unit 14 determines whether or not the acceleration data measured by the acceleration sensor 11 includes vibrations that match vibration detection conditions preset by the condition input unit 17 .

When there is vibration that meets the conditions, the vibration detection unit 14 gives the start time and end time of the detected vibration to the control unit 13 and notifies the detection of the vibration. For example, if a threshold for one-sided amplitude (0-to-peak) of acceleration data and a time width are set as vibration detection conditions, if there is a sample in the acceleration data that exceeds the threshold, Among the samples at times earlier than the samples exceeding the threshold, the last point continuously below the threshold for more than the time width of the vibration detection condition is extracted as the start time of the vibration. Among the late time samples, the first point that continuously falls below the threshold for the time width of the vibration detection condition or more is extracted as the end time of the vibration.

[Displacement calculator]
The displacement calculation unit 15 acquires acceleration data from the data storage unit 12 and calculates displacement time-series data when receiving a displacement calculation request from the control unit 13 .

The displacement calculation unit 15 calculates the displacement using the vibration start time and end time received from the control unit 13 and the acceleration data obtained from the data storage unit 12 . For example, after extracting the data between the start time and the end time of the vibration from the acceleration data acquired from the data holding unit 12, a high-pass filter is applied to the extracted acceleration data, and the displacement is performed by second-order integration in the time direction. to calculate

The displacement calculation unit 15 extracts the maximum value of displacement and the time when the maximum value is obtained from the calculated displacement data, and requests the communication unit 16 to transmit them.

[Communication]
The communication unit 16 is a communication interface that wirelessly transmits and receives packets to and from other nodes (the wireless communication device 10 and the base station 20) in the sensor network SN.

Upon receiving the vibration detection packet from another node, the communication unit 16 notifies the control unit 13 of reception of the vibration detection packet. The vibration detection packet is broadcast so that all nodes in the same system can receive it.

When the controller 13 requests transmission of the vibration detection packet, the communication unit 16 broadcasts the vibration detection packet. Further, the communication unit 16 transmits the displacement data to the data collection device 30 when the transmission of the displacement data is requested by the displacement calculation unit 15 .

[Condition input part]
The condition input unit 17 sets measurement cycle information used by the control unit 13 and vibration detection conditions used by the vibration detection unit 14 .

The condition input unit 17 may be one that inputs via a physical interface such as a serial port or USB, or a packet including the measurement cycle information and the vibration detection conditions via the communication unit 16 may be set by exchanging

(A-2) Operation of Embodiment Next, the operation of the data measurement system 1 of this embodiment having the configuration as described above will be described.

FIG. 3 is an explanatory diagram showing characteristic operations of the wireless communication device in the data measurement system according to the embodiment. In each wireless communication device 10, measurement cycle information and data retention time used by the control unit 13, and vibration detection conditions used by the vibration detection unit 14 are set in advance via the condition input unit 17. and In addition, it is assumed that the measurement period information is set to the same value in each wireless communication device 10 .

<S101>
The control unit 13 of the wireless communication device 10 operates the acceleration sensor 11 according to the measurement cycle information. The acceleration sensor 11 provides acceleration data as sensing data to the data holding unit 12 . The data holding unit 12 temporarily holds acceleration data acquired from the acceleration sensor 11 .

<S102>
The control unit 13 requests the vibration detection unit 14 to detect vibration. The vibration detection unit 14 acquires the held acceleration data from the data holding unit 12 .

Then, the vibration detection unit 14 determines whether or not the acquired acceleration data includes vibration that meets the vibration detection condition. The vibration detection unit 14 terminates the series of processes when vibration is not included. On the other hand, when vibration is included, the vibration detection unit 14 gives the start time and end time of the detected vibration to the control unit 13 and notifies the detection of the vibration.

<S103>
When notified of the vibration detection by the vibration detection unit 14, the control unit 13 requests the communication unit 16 to transmit a vibration detection packet. When the control unit 13 requests transmission of the vibration detection packet, the communication unit 16 broadcasts the vibration detection packet within the sensor network SN.

<S104>
If the control unit 13 receives notification of reception of the vibration detection packet transmitted by another node before the data retention time elapses after the measurement is completed, the control unit 13 sets the start time and end time of the detected vibration to the displacement calculation unit 15. Give a time and request the calculation of the displacement.

On the other hand, if the control unit 13 does not receive a notification of detection of reception of the vibration detection packet transmitted by another terminal even after the data holding time has elapsed after the measurement is completed, the control unit 13 stores the acceleration data in the data holding unit 12. Request deletion. When the control unit 13 requests deletion of the stored acceleration data, the data storage unit 12 deletes the stored acceleration data and ends the series of processes.

<S105>
Upon receiving a displacement calculation request from the control unit 13, the displacement calculation unit 15 requests the data storage unit 12 to acquire acceleration data. The displacement calculation unit 15 calculates displacement data from the acceleration data acquired from the data holding unit 12 . When requested by the displacement calculation unit 15, the data holding unit 12 gives the stored acceleration data to the displacement calculation unit 15 and deletes the stored acceleration data.

The displacement calculation unit 15 extracts the maximum value of displacement and the time at which the maximum value is obtained from the calculated displacement data, provides the extracted displacement data to the communication unit 16, and requests transmission of the displacement data.

<S106>
When the transmission of displacement data is requested by the displacement calculation unit 15, the communication unit 16 transmits a packet including the maximum value of the displacement acquired from the displacement calculation unit 15 and the time when the maximum value is obtained, to the data collection device 30. .

(A-3) Effects of Embodiment According to this embodiment, the following effects are obtained.

Since the data measurement system 1 of this embodiment has a simpler configuration than a measurement system that constantly measures, it is possible to reduce the installation cost.

The data measurement system 1 calculates the displacement and calculates the value only when there is vibration that matches the conditions preset by the user of the system and the vibration is detected by a plurality of sensor terminals (a plurality of wireless communication devices 10). send. Therefore, it is possible to reduce the number of executions of wasteful processing of data that does not include the vibration to be measured, and power saving is improved compared to the case where all the measurement data are processed each time.

(B) Other Embodiments The present invention is not limited to the above-described embodiments, and modified embodiments as exemplified below can also be mentioned.

(B-1) In the above embodiment, as the operation of the vibration detection unit 14, the operation of extracting one vibration per measurement was described, but a plurality of vibrations may be extracted in one measurement. . As a modification, for example, after extracting one vibration, the same determination operation is performed again for the section other than the start time to end time of the extracted vibration, and multiple sets of start time and end time are extracted. good too.

(B-2) The control unit 13 requests the calculation of displacement when receiving notification of reception of the vibration detection packet transmitted by another wireless communication device 10 before the data retention time elapses. You can add conditions. For example, the control unit 13 transmits the vibration detection packet with the start time and end time of the vibration described therein, and the interval from the start time to the end time of the vibration detected by the other wireless communication device 10 and the vibration detected by itself. If there is an overlap in the interval from the start time to the end time of , the calculation of the displacement may be requested.

DESCRIPTION OF SYMBOLS 1... Data measurement system 10... Wireless communication apparatus 11... Acceleration sensor 12... Data holding part 13... Control part 14... Vibration detection part 15... Displacement calculation part 16... Communication part 17... Condition input part , 20... Base station, 30... Data collection device, NT... Backbone network, SN... Sensor network.

Claims (6)

A measuring device comprising an acceleration sensor,
control means for controlling the operation of the acceleration sensor based on predetermined measurement cycle information;
a communication means for transmitting and receiving data to and from another measuring device;
data holding means for holding acceleration data measured by the acceleration sensor;
vibration detection means for determining whether or not the acceleration data includes vibration that meets predetermined vibration detection conditions;
displacement calculation means for calculating a displacement based on the acceleration data and extracting a part of information from the calculated displacement data only when the vibration detection means detects a vibration that meets the vibration detection conditions. measurement device. When the vibration detection means detects vibration, the control means uses the communication means to notify the other measurement device of a vibration detection packet indicating that the vibration has been detected, and to the other measurement device within a predetermined time. 2. The measuring apparatus according to claim 1, wherein said displacement calculating means performs processing only when said vibration detection packet transmitted from is received. 3. The measuring apparatus according to claim 2, wherein the information extracted from the displacement data by the displacement calculation means is a maximum value of displacement and a time of the maximum value. A computer installed in a measuring device equipped with an acceleration sensor,
control means for controlling the operation of the acceleration sensor based on predetermined measurement cycle information;
a communication means for transmitting and receiving data to and from another measuring device;
data holding means for holding acceleration data measured by the acceleration sensor;
vibration detection means for determining whether or not the acceleration data includes vibration that meets predetermined vibration detection conditions;
Only when the vibration detection means detects vibration that meets the vibration detection conditions, the displacement is calculated based on the acceleration data, and functions as a displacement calculation means for extracting part of the information from the calculated displacement data. A measurement program characterized by A measuring method for use in a measuring device equipped with an acceleration sensor,
The control means controls the operation of the acceleration sensor based on predetermined measurement cycle information,
The communication means transmits and receives data to and from other measuring devices,
The data holding means holds acceleration data measured by the acceleration sensor,
The vibration detection means determines whether or not the acceleration data includes vibration that meets predetermined vibration detection conditions,
The displacement calculation means calculates the displacement based on the acceleration data only when the vibration detection means detects vibration that meets the vibration detection conditions, and extracts part of the information from the calculated displacement data. measurement method. A measurement system having a plurality of measurement devices and a data collection device that collects data measured by each measurement device,
A measurement system, wherein the measurement device according to any one of claims 1 to 3 is applied as each of the measurement devices.

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