JP6565159B2 - MONITORING DEVICE, MONITORING SYSTEM, AND MONITORING METHOD - Google Patents

Description

  The present invention relates to a technique for monitoring the state of structures such as bridges and buildings.

  Conventionally, various types of structures such as bridges and buildings use various types of sensors such as temperature sensors, humidity sensors, acceleration sensors, displacement sensors, infrared image sensors, etc. Such a state) is monitored.

  For example, Patent Document 1 detects a measurement sensor (vibration sensor, acceleration sensor, video camera, smoke camera, humidity sensor, or the like) that measures a physical quantity to be measured, and an activation condition that is a condition for activating the measurement sensor. Start sensor (sensor using magnetic material, thermoelectric element, piezoelectric element, pyroelectric element, etc.), and start the measurement sensor from the non-start state when the start condition is detected by the start sensor A configuration for switching to a state is disclosed. In this configuration, the measurement sensor is not always activated, but temporarily activated when the activation condition is detected, so that power consumption can be reduced.

JP2013-9079A

  However, Patent Document 1 is configured to activate the measurement sensor when the activation sensor detects that the structure is shaking (when the activation condition is detected). The structure shakes when an external force is applied. There are various types of external forces that shake the structure, such as those caused by strong winds, those caused by passage of moving objects (vehicles, trains, etc.), and those caused by earthquake motion. Therefore, in the configuration described in Patent Document 1, it is determined whether or not the structure is shaken by the earthquake motion, and when the structure is shaken by the earthquake motion, the physical quantity to be measured applied to the structure is not sensed. There wasn't. Therefore, it is not possible to sense the measurement target physical quantity related to the structure by distinguishing between when the structure is shaken by the earthquake motion and when the structure is shaken elsewhere.

  An object of the present invention is to provide a technology capable of sensing a measurement target physical quantity relating to a structure by distinguishing between when the structure is shaken by earthquake motion and when the structure is shaken elsewhere. is there.

  The monitoring device of the present invention is configured as follows to achieve the above object.

The monitoring device includes a state detection sensor node and a trigger sensor node. The state detection sensor node can be connected to a state detection sensor attached to the structure in order to sense a physical quantity to be measured on the structure. The trigger sensor node is a first trigger detection sensor attached to the structure for sensing a first trigger physical quantity used to determine a sensing period in which the state detection sensor senses the measurement target physical quantity of the structure. Can be connected. The state detection sensor senses, for example, acceleration, displacement, distortion, vibration frequency, temperature, humidity, pressure, infrared amount, volume, illuminance, and wind speed as measurement target physical quantities. The first physical quantity for trigger is a physical quantity related to the shaking of the structure due to earthquake motion, and is, for example, acceleration, displacement, distortion, or vibration frequency. The structure is a structure having an upper structure, a lower structure that supports the upper structure, and a support that absorbs vibration provided between the upper structure and the lower structure. The first trigger detection sensor is attached to the lower structure of the structure. Furthermore, the state detection sensor connected to the state detection sensor node is attached above the first trigger detection sensor connected to the trigger sensor node in the height direction of the structure.

The trigger sensor node includes a timing determination unit and an output unit. The timing determination unit processes the first physical quantity for trigger sensed by the connected first trigger detection sensor to determine whether the structure is shaken by the earthquake motion , and the structure is shaken by the earthquake motion. If it is determined that it is, it is determined that it is the start timing of the sensing period. When the output determination unit determines that the timing is the start timing of the sensing period, the output unit outputs the fact to the state detection sensor node.

The state detection sensor node includes a power supply unit and a measurement target physical quantity acquisition unit. The power supply unit temporarily receives the input indicating that it is the start timing of the sensing period from the trigger sensor node , and the connected state detection sensor temporarily when the measurement timing is set in advance. Supply drive power to The measurement target physical quantity acquisition unit acquires the measurement target physical quantity applied to the structure by sensing with a state detection sensor to which the power supply unit temporarily supplies drive power.

  The state in which the power supply unit stops supplying drive power to the state detection sensor may be a state in which no power is supplied to the state detection sensor, but is not limited to this state. Absent. That is, the state in which the power supply unit stops supplying the driving power to the state detection sensor is a state in which power necessary for the state detection sensor to operate properly is not supplied. For example, when the power supply unit stops supplying driving power to the state detection sensor, the state detection sensor maintains a standby state (sleep state) in order to reduce the time required for the state detection sensor to start. The state which supplies the required electric power may be sufficient.

  Thereby, when the structure is shaken by the earthquake motion and when the structure is shaken other than the earthquake motion, it is possible to sense the measurement target physical quantity related to the structure.

When a general structure is swayed by an earthquake motion, the sway near the ground is larger than when it is swayed at other times. Therefore, it is preferable that the first trigger detection sensor is attached at a location relatively close to the ground. In other words, it is preferable that the state detection sensor is attached above the first trigger detection sensor in the height direction of the structure.

In the structure, if there is a portion where the vibration is different between when it is shaken by the earthquake motion and when it is shaken other than this, the first trigger detection sensor may be attached to that portion.

Further, if the structure has an upper structure, a lower structure that supports the upper structure, and a support that absorbs vibration provided between the upper structure and the lower structure, the first trigger detection sensor is the structure. It is better to attach to the substructure.

The trigger sensor node is
After the timing determination unit outputs an output indicating that it is the start timing of the sensing period in the output unit, the first physical quantity for the trigger sensed by the connected first trigger detection sensor is processed, and the structure Is determined to be the end timing of the sensing period,
When the timing determination unit determines that the timing is the end timing of the sensing period, the output unit may output that fact to the state detection sensor node.

  If comprised in this way, a sensing period can be determined appropriately and power consumption can be suppressed efficiently.

  Further, the trigger sensor node and the state detection sensor node may be configured to perform input / output by wireless communication. In this case, the state detection sensor node may be divided into a first group that performs wireless communication with the trigger sensor node and a second group that performs wireless communication with the state detection sensor node belonging to the first group. In this way, the position where the state detection sensor node belonging to the second group is provided is not limited to within the wireless communication area of the trigger sensor node, but within the wireless communication area of the state detection sensor node belonging to the first group. I just need it. Thereby, the freedom degree of the position which provides the sensor node for state detection can be raised.

  Further, the trigger sensor node and the state detection sensor node belonging to the first group may be configured to communicate not only wirelessly but also by wire. Further, the state detection sensor node belonging to the first group and the state detection sensor node belonging to the second group may be configured to communicate not only wirelessly but also by wire. Further, one of communication between the trigger sensor node and the state detection sensor node belonging to the first group, or communication between the state detection sensor node belonging to the first group and the state detection sensor node belonging to the second group. May be wireless and the other may be wired.

In addition, the state detection sensor node can be connected to a second trigger detection sensor that senses a physical quantity related to shaking of the structure as a second trigger physical quantity.
The power supply unit supplies the drive power to the second trigger detection sensor before temporarily supplying the drive power to the state detection sensor when the measurement timing comes, and the second trigger detection sensor If the magnitude of the shaking of the structure obtained by processing the sensed second physical quantity for triggering is not larger than a predetermined magnitude, the supply of drive power to the second trigger detection sensor is stopped, You may make it the structure which stops supplying drive power temporarily with respect to a state detection sensor.
The sensor node for status detection, in the sensing period may be provided an output unit for output the measurement target physical quantity according to a structure which is sensed by the state detection sensors connected.

Further, the host device may be configured to collect and process the measurement target physical quantity applied to the structure input from the state detection sensor node and analyze the state of the structure .

  According to the present invention, it is possible to sense the measurement target physical quantity relating to the structure by distinguishing between when the structure is shaken by the earthquake motion and when the structure is shaken elsewhere.

It is a figure which shows the structure of a monitoring system provided with a monitoring apparatus. It is a figure which shows the structure of the principal part of the sensor node for triggers. It is a figure which shows the structure of the principal part of the sensor node for a state detection. It is the schematic which shows the bridge which is a structure. It is a block diagram which shows the structure of the principal part of a data processor. It is a flowchart which shows operation | movement of the sensor node for triggers. It is a flowchart which shows the 1st measurement process of the sensor node for a state detection. It is a flowchart which shows the 2nd measurement process of the sensor node for state detection. It is a flowchart which shows the 1st measurement process of the sensor node for state detection concerning another example. It is a flowchart which shows operation | movement of the sensor node for a trigger concerning another example. It is a flowchart which shows the 2nd measurement process of the sensor node for state detection concerning another example. It is the schematic which shows the bridge which is a structure concerning another example.

  Embodiments of the present invention will be described below.

  FIG. 1 is a diagram showing a configuration of a monitoring system including a monitoring device according to an embodiment of the present invention.

  The monitoring system according to this example includes a monitoring device M, a data processing device 3, a data server 4, and an external server 5. The monitoring system according to this example distinguishes between the case where the structure to be measured is shaken by the earthquake motion and the case where it is shaken elsewhere, and senses the physical quantity to be measured for the structure with a sensor, This is a system for analyzing the state of the structure.

  As shown in FIG. 1, a plurality of data servers 4 are connected to the external server 5. A plurality of data processing devices 3 are connected to each data server 4. A plurality of monitoring devices M are connected to each data processing device 3. The monitoring device M includes one trigger sensor node 1 and a plurality of state detection sensor nodes 2.

  Note that the number of data servers 4 connected to the external server 5 may be one. Further, the number of data processing devices 3 connected to the data server 4 may be one. Further, the number of state detection sensor nodes 2 included in the monitoring device M may be one.

  As will be described later, in this example, the trigger sensor node 1 and the state detection sensor node 2 constituting the monitoring device M are the same in hardware configuration, but the processing during operation is different. . In this example, the trigger sensor node 1 and the state detection sensor node 2 communicate wirelessly. That is, the state detection sensor node 2 is provided in the wireless communication area of the trigger sensor node 1. The trigger sensor node 1 and the state detection sensor node 2 may be configured to communicate by connecting with a wire.

  Further, the trigger sensor node 1 and the state detection sensor node 2 constituting the monitoring device M communicate with the data processing device 3 wirelessly. The trigger sensor node 1 and the state detection sensor node 2 constituting the monitoring device M may be connected to and communicate with the data processing device 3 by wire.

  The data processing device 3 is communicably connected to the data server 4 in a wireless or wired manner. Further, the data server 4 is communicably connected to the external server 5 wirelessly or by wire.

  The data processing device 3, the data server 4, and the external server 5 may be configured as a single housing as a single device. Further, the data processing device 3 and the data server 4 may be configured as one device with a single housing. In this case, the external server 5 is configured by another casing. In addition, the data server 4 and the external server 5 may be configured as one device with one housing. In this case, the data processing device 3 is configured by another casing.

  In this example, the data processing device 3 is described as a host device in the present invention, but the data server 4 or the external server 5 may be a host device in the present invention.

The trigger sensor node 1 and the plurality of state detection sensor nodes 2 constituting the monitoring device M are attached to a structure to be measured. The monitoring device M assigns one structure to each region obtained by dividing the structure to be measured. Each monitoring device M has a trigger sensor node 1 and a plurality of state detection sensor nodes 2 attached in an assigned region. The plurality of state detection sensor nodes 2 constituting the monitoring device M are located within the wireless communication area of the trigger sensor node 1.

  The data processing device 3 is provided for each group to which a plurality of monitoring devices M belong. The data processing device 3 collects measurement target physical quantities related to the measurement target structure sensed by the sensors by the monitoring devices M belonging to the corresponding group, and analyzes the state of the structure.

  The data server 4 is provided for each group to which a plurality of data processing devices 3 belong. The data server 4 collects and stores the measurement target physical quantity of the measurement target structure collected by the data processing device 3 belonging to the corresponding group, the state of the structure as the analysis result, and the like.

  When the host device referred to in the present invention is the data server 4, the data server 4 performs a process of analyzing the state of the structure instead of the data processing device 3 described above.

  The external server 5 is provided for each group to which a plurality of data servers 4 belong. The external server 5 collects and stores the measurement target physical quantity of the measurement target structure collected by the data server 4 belonging to the corresponding group, the state of the structure as the analysis result, and the like.

  When the host device referred to in the present invention is the external server 5, the external server 5 performs a process of analyzing the state of the structure in place of the data processing device 3 and the data server 4 described above.

  FIG. 2 is a diagram illustrating a configuration of a main part of the trigger sensor node, and FIG. 3 is a diagram illustrating a configuration of a main part of the state detection sensor node. As described above, the trigger sensor node 1 and the state detection sensor node 2 are the same in hardware configuration. The trigger sensor node 1 includes a control unit 10, a trigger detection sensor control circuit 11, state detection sensor control circuits 12, 13, 14, a timer 15, a storage unit 16, a wireless communication unit 17, and a power supply unit 18. And. Similarly, the state detection sensor node 2 includes a control unit 20, a trigger detection sensor control circuit 21, state detection sensor control circuits 22, 23, 24, a timer 25, a storage unit 26, and a wireless communication unit 27. The power supply unit 28 is provided.

  The control unit 10 controls the operation of each part of the trigger sensor node 1 main body.

  A trigger detection sensor 100 is connected to the trigger detection sensor control circuit 11. The trigger detection sensor control circuit 11 processes a power supply circuit that supplies drive power to the connected trigger detection sensor 100 and a detection signal of the trigger detection sensor 100 (a sensing signal input from the trigger detection sensor 100). A processing circuit for obtaining sensing data (measured physical quantity) is provided. The trigger detection sensor 100 is a sensor that senses a physical quantity (acceleration, displacement, distortion, vibration frequency, etc.) applied to the measurement target structure. In this example, there is one trigger detection sensor 100 connected to the trigger sensor node 1, but a plurality of trigger detection sensors 100 may be provided.

  The state detection sensor 101 is connected to the state detection sensor control circuits 12, 13, and 14. The state detection sensor control circuits 12, 13, and 14 are a power supply circuit that supplies driving power to the connected state detection sensor 101, and a detection signal of the state detection sensor 101 (a sensing signal input from the state detection sensor 101). And a processing circuit for obtaining sensing data (measured physical quantity). As described above, the state detection sensor 101 senses physical quantities (acceleration, displacement, distortion, vibration frequency, temperature, humidity, pressure, infrared amount, volume, illuminance, wind speed, etc.) related to the state of the structure to be measured. Sensor. In this example, the number of state detection sensors 101 connected to the trigger sensor node 1 is three, but may be one, two, or four or more.

  The state detection sensor control circuits 12, 13, and 14 are not the same circuit, but are circuits corresponding to the state detection sensor 101 to be connected.

  The timer 15 measures the current date and time.

  The storage unit 16 temporarily stores various setting parameters used during operation of the trigger sensor node 1 and sensing data acquired by processing the sensing signals input from the connected trigger detection sensor 100 and the state detection sensor 101. Remember.

  The wireless communication unit 17 controls wireless communication with the state detection sensor node 2 and the data processing device 3.

  The power supply unit 18 includes a battery 18a. The battery 18 a is a driving power source for the trigger sensor node 1. The power supply unit 18 supplies power necessary for the operation from the battery 18a to each part of the trigger sensor node 1 main body. As described above, the trigger detection sensor control circuit 11 supplies driving power to the connected trigger detection sensor 100, and the state detection sensor control circuits 12, 13, and 14 are connected to the state detection sensor 101. The drive power is supplied to. That is, the battery 18a also supplies drive power to the trigger detection sensor 100 and the state detection sensor 101.

  Further, in this example, the trigger sensor node 1 supplies the drive power from the battery 18 a by the power supply unit 18 for the control unit 10, trigger detection sensor control circuit 11, timer 15, storage unit 16, and wireless communication unit 17. However, the state detection sensor control circuits 12, 13, and 14 are intermittently supplied with drive power from the battery 18a by the power supply unit 18 as necessary. Specifically, the power supply unit 18 turns on / off the supply of drive power from the battery 18 a to the state detection sensor control circuits 12, 13, 14 in accordance with an instruction from the control unit 10.

  Note that the state in which the power supply unit 18 turns off the supply of drive power to the state detection sensor control circuits 12, 13, and 14 (drive power supply stop state) refers to the state detection sensor control circuits 12, 13, and 14. However, power supply may not be performed at all. However, the present invention is not limited to this state. The drive power supply stop state here refers to the supply of power necessary for the power supply unit 18 to properly operate the state detection sensor control circuits 12, 13, 14 and the connected state detection sensor 101. It is not in a state. For example, in order to shorten the time required for the power supply unit 18 to start the state detection sensor control circuits 12, 13, 14, and the connected state detection sensor 101, the state detection sensor control circuits 12, 13, 14, and the connection The state where the state detection sensor 101 being supplied supplies power necessary for maintaining the standby state (sleep state) is also included in the drive power supply stop state referred to herein.

  In the trigger sensor node 1 according to this example, the battery 18a is the drive power source for the trigger sensor node 1, but the commercial power source may be the drive power source for the trigger sensor node 1.

  The state detection sensor node 2 includes a control unit 20, a trigger detection sensor control circuit 21, state detection sensor control circuits 22, 23 and 24, a timer 25, a storage unit 26, a wireless communication unit 27, and a power supply unit 28. The same as the control unit 10, trigger detection sensor control circuit 11, state detection sensor control circuits 12, 13 and 14, timer 15, storage unit 16, wireless communication unit 17, and power supply unit 18 included in the sensor node 1 described above. It is the composition. The trigger sensor node 1 and the state detection sensor node 2 are different in processing during operation (operation program for operating the control units 10 and 20).

  Further, the state detection sensor node 2 always supplies drive power from the battery 28a by the power supply unit 28 for the control unit 20, timer 25, storage unit 26, and wireless communication unit 27, but the trigger detection sensor control circuit. 21 and the state detection sensor control circuits 22, 23, 24 are intermittently supplied with drive power from the battery 28a by the power supply unit 28 as necessary. Specifically, the power supply unit 28 turns on / off the supply of drive power from the battery 28 a to the trigger detection sensor control circuit 21 and the state detection sensor control circuits 22, 23, 24 in accordance with an instruction from the control unit 20. To do.

  As described above, the trigger sensor node 1 and the state detection sensor node 2 are attached to the structure to be measured. The trigger detection sensor 100 and the state detection sensor 101 connected to the trigger sensor node 1 and the state detection sensor node 2 are also attached to the structure to be measured. Structures to be measured include bridges, tunnels, buildings, houses, plant facilities, pipelines, utility poles, gas supply facilities, water and sewage facilities, and ruins. In this example, the structure to be measured will be described as a bridge (an elevated road bridge shown in FIG. 4).

  FIG. 4 is a schematic diagram showing a bridge which is a structure for sensing a state by the monitoring system according to this example. The bridge shown in FIG. 4 is an elevated road bridge on which automobiles travel. The elevated bridge is divided into an upper structure and a lower structure. The upper structure includes floor slabs, main girders, main structures, horizontal structures, and the like, and the lower structure includes abutments and piers. The traveling path of the automobile is formed on the floor slab of the superstructure. Between the upper structure and the lower structure, there is a support that absorbs the vibration of the upper structure and the deformation of the upper structure that accompanies the traveling of the vehicle on the road (road surface) and suppresses the load load on the lower structure. Yes. The substructure piers and abutments are installed on a foundation formed in the ground. The upper side of the bearing is called the upper structure, and the lower side of the bearing is called the lower structure.

  In general, it is difficult for the superstructure of an elevated road bridge to detect separately the vibration caused by the traveling of an automobile on the road (road surface) and the vibration caused by the earthquake motion. On the other hand, the substructure of the elevated road bridge absorbs the vibration caused by the driving of the car on the road (road surface) by the support, so the vibration caused by the driving of the car on the road (road surface) and the vibration caused by the earthquake motion. Can be distinguished and detected.

  In this example, the monitoring device M is configured by one trigger sensor node 1 and six state detection sensor nodes 2 shown in FIG. The trigger detection sensor 100 and the state detection sensor 101 connected to the trigger sensor node 1 are attached to the lower structure of the elevated road bridge. The trigger sensor node 1 preferably attaches the connected trigger detection sensor 100 to the elevated road bridge as close to the ground as possible in order to accurately determine whether the elevated road bridge is shaken by earthquake motion.

  The trigger sensor node 1 body is not limited to the lower structure of the elevated bridge, and may be attached to the upper structure.

  In addition, the trigger detection sensor 100 and the state detection sensor 101 connected to the state detection sensor node 2 are applied to the elevated road bridge when the elevated road bridge, which is a structure to be measured, is shaken by the earthquake motion. It is attached to the position where the physical quantity to be measured is sensed. In FIG. 4, the trigger detection sensor 100 attached to the superstructure of the elevated road bridge, three state detection sensor nodes 2 connected to the state detection sensor 101, and the trigger detection sensor 100 attached to the lower structure of the elevated road bridge, And three state detection sensor nodes 2 to which the state detection sensor 101 is connected.

  The trigger detection sensor 100 and the state detection sensor 101 connected to the state detection sensor node 2 may be attached only to the upper structure of the elevated road bridge, or attached only to the lower structure of the elevated road bridge. It may be done.

  The six state detection sensor nodes 2 shown in FIG. 4 are located within the wireless communication area of the trigger sensor node 1 shown in FIG.

  FIG. 5 is a block diagram showing a configuration of a main part of the data processing apparatus. The data processing device 3 includes a control unit 31, an operation unit 32, a display unit 33, a storage unit 34, and a communication unit 35. The control unit 31 controls the operation of the main body of the data processing device 3. The operation unit 32 receives an operator's operation on the main body of the data processing device 3. An input device such as a mouse or a keyboard is connected to the operation unit 32. The operator operates the input device. The display unit 33 controls screen display on a connected display device such as a display. The storage unit 34 stores sensing data collected from the monitoring device M (measurement target physical quantity related to the measurement target structure) and the like. The communication unit 35 controls communication with the monitoring device M and communication with the data server 4.

  In the data processing device 3, the control unit 31 performs data processing such as aggregation and analysis on the sensing data received from the monitoring device M, and transmits the processing result to the data server 4.

  The data processing device 3 may be configured to transmit the received sensing data to the data server 4 without performing data processing such as aggregation and analysis on the sensing data received from the monitoring device M. In this case, the data server 4 may perform data processing such as aggregation and analysis on the sensing data received from the monitoring device M.

  The external server 5 can communicate with a plurality of data servers 4 and stores data processing results received from the data processing devices 3 via the data servers 4.

  In addition, at least one of the data processing device 3, the data server 4, or the external server 5 accepts an input operation of various setting information of the monitoring system by the operator, and transmits the setting information according to the input to each device in the monitoring system. To do. For example, the external server 5 performs the operation parameters of the state detection sensor control circuits 12, 13, 14, 22, 23, 24, correction values thereof, and measurement processing for the trigger sensor node 1 and the state detection sensor node 2 Is received, and setting information corresponding to the input is transmitted to the trigger sensor node 1 and the state detection sensor node 2 via the data server 4 and the data processing device 3. .

  Next, the operation of the monitoring device M will be described. FIG. 6 is a flowchart showing the operation of the trigger sensor node. 7 and 8 are flowcharts showing the operation of the state detection sensor node. FIG. 7 is a flowchart showing a first measurement process of the state detection sensor node. FIG. 8 is a flowchart showing a second measurement process of the state detection sensor node.

  The trigger sensor node 1 constantly supplies drive power to the control unit 10, trigger detection sensor control circuit 11, timer 15, storage unit 16, and wireless communication unit 17 from the power supply unit 18. The trigger sensor node 1 temporarily supplies drive power to the state detection sensor control circuits 12, 13, and 14 as necessary. That is, the trigger sensor node 1 does not always supply driving power to the state detection sensor control circuits 12, 13, 14 and the connected state detection sensor 101, but temporarily supplies them as necessary. By doing so, the power consumption is reduced.

  The trigger sensor node 1 processes a sensing signal (detection signal of the trigger detection sensor 100) input from the trigger detection sensor 100 to which the trigger detection sensor control circuit 11 is connected, and generates sensing data (physical quantity for trigger). Obtain (s1). The trigger detection sensor 100 is a sensor that senses vibration at the mounting position of the elevated road bridge. The trigger detection sensor control circuit 11 uses the sensing data obtained by processing the sensing signal input from the trigger detection sensor 100 to determine whether or not the mounting position of the trigger detection sensor 100 on the elevated bridge is shaken by the earthquake motion. Determine (s2). For example, when the trigger detection sensor 100 is an acceleration sensor, the mounting position of the trigger detection sensor 100 on the elevated road bridge is shaken by an earthquake motion if the acceleration, which is the sensing data acquired in s1, is greater than a predetermined detection threshold. It is determined that Further, when the trigger detection sensor 100 is a displacement amount sensor, if the displacement amount, which is the sensing data acquired in s1, is larger than a predetermined detection threshold, the mounting position of the trigger detection sensor 100 on the elevated road bridge is caused by earthquake motion. Judge that it is shaking.

  In s2, the instantaneous value of sensing data (trigger physical quantity) sensed by the trigger detection sensor 100 such as acceleration and displacement may be set as a value to be compared with the detection threshold, or for a certain period of time (several tens of ms to 1 second). The maximum absolute value of the sensing data (trigger physical quantity) sensed by the trigger detection sensor 100 such as acceleration and displacement may be set as a value to be compared with the detection threshold, or for a certain time (several tens of ms to 1 second). The difference between the maximum and minimum values of sensing data (trigger physical quantities) such as acceleration and displacement (ie, the magnitude of the amplitude) measured over a certain degree) may be used as a value to be compared with the detection threshold, or for a certain amount of time Sensing data (such as acceleration and displacement) sensed by the trigger detection sensor 100 over a period of several tens of ms to about 1 second ( The average value of the absolute value of the trigger for the physical quantity) may be a value to compare the detection threshold. The detection threshold used in s2 is set according to the type of value to be compared with this detection threshold.

  If the trigger sensor node 1 repeats the processes of s1 and s2 and determines that the mounting position of the trigger detection sensor 100 on the elevated road bridge is shaken by the earthquake motion, the drive power source for the state detection sensor control circuits 12, 13, and 14 is determined. Supply is started (s3). As a result, in the trigger sensor node 1, the state detection sensor 101 connected to the state detection sensor control circuits 12, 13, and 14 is activated, and the state detection sensor 101 starts sensing the physical quantity to be measured. The trigger sensor node 1 processes the sensing signal (the detection signal of the state detection sensor 101) input from the state detection sensor 101 connected to the state detection sensor control circuits 12, 13, and 14, and acquires the sensing data. To do. The trigger sensor node 1 temporarily stores the acquired sensing data from the state detection sensor 101 in the storage unit 16.

  Further, the trigger sensor node 1 transmits (outputs) a trigger signal instructing the start of sensing from the wireless communication unit 17 to the state detection sensor node 2 constituting the monitoring device M (s4).

  When the trigger sensor node 1 performs sensing by the state detection sensor 101 connected to the state detection sensor control circuits 12, 13, and 14 for a certain time (for example, several tens of seconds to several minutes) (s5), the state detection sensor The supply of drive power to the control circuits 12, 13, and 14 is stopped (s6). Accordingly, the trigger sensor node 1 stops the state detection sensor 101 connected to the state detection sensor control circuits 12, 13, and 14, and ends the sensing of the physical quantity to be measured by the state detection sensor 101 started in s3. .

  Further, the trigger sensor node 1 transmits the sensing data acquired between s3 and s6 to the data processing device 3 (s7), and returns to s1.

  Next, the operation of the state detection sensor node will be described with reference to FIGS. The state detection sensor node 2 executes a first measurement process shown in FIG. 7 and a second measurement process shown in FIG. The state detection sensor node 2 constantly supplies drive power to the control unit 20, the timer 25, the storage unit 26, and the wireless communication unit 27 from the power supply unit 28. Further, the state detection sensor node 2 temporarily supplies drive power to the trigger detection sensor control circuit 21 and the state detection sensor control circuits 22, 23, and 24 as necessary. That is, the state detection sensor node 2 constantly supplies drive power to the trigger detection sensor control circuit 21, the state detection sensor control circuits 22, 23, and 24, the connected trigger detection sensor 100, and the state detection sensor 101. Instead of this, it is configured to suppress power consumption by temporarily supplying it as necessary.

  The first measurement process will be described with reference to FIG. The state detection sensor node 2 starts supplying drive power to the trigger detection sensor control circuit 21 at a predetermined measurement timing (s11) (s12). The measurement timing is set to be repeated at an appropriate time interval. For example, the measurement timing is determined every hour on the hour or when a certain time has passed since the previous measurement. In s12, the trigger detection sensor 100 connected to the trigger detection sensor control circuit 21 for which the supply of drive power has been started is activated and starts sensing. The trigger detection sensor control circuit 21 uses the sensing data (physical quantity for trigger) acquired by processing the sensing signal (the detection signal of the trigger detection sensor 100) input from the connected trigger detection sensor 100, and the elevated road. It is determined whether or not the magnitude of shaking at the mounting position of the trigger detection sensor 100 on the bridge is larger than a predetermined shaking magnitude (first shaking threshold) (s13). In s13, it is determined whether or not the shaking of the elevated bridge due to the driving of the automobile or strong wind on the road (road surface) is large. For example, when the trigger detection sensor 100 is an acceleration sensor, it is determined in s13 whether or not the acceleration, which is the sensing data acquired in s12, is greater than a predetermined first shaking threshold. If the trigger detection sensor 100 is a displacement amount sensor, it is determined in s13 whether the displacement amount, which is the sensing data acquired in s12, is greater than a predetermined first shaking threshold.

  In s13, the instantaneous value of sensing data (trigger physical quantity) such as acceleration and displacement sensed by the trigger detection sensor 100 may be used as a value to be compared with the first shaking threshold, or for a certain amount of time (several tens of ms to 1). The maximum absolute value of the sensing data (trigger physical quantity) sensed by the trigger detection sensor 100 over a period of about a second) may be used as a value to be compared with the first shaking threshold, or for a certain amount of time ( The difference value (that is, the magnitude of the amplitude) between the maximum value and the minimum value of sensing data (trigger physical quantity) such as acceleration and displacement measured over several tens of ms to 1 second is compared with the first fluctuation threshold. It is good also as a value, The acceleration, displacement amount, etc. which were sensed by the trigger detection sensor 100 over a certain period of time (several tens ms to about 1 second) The average value of the absolute values of the measured data (the trigger physical quantity) may be a value to compare with the first shaking threshold value. The first shaking threshold used in s13 is set according to the type of value to be compared with the first shaking threshold.

  If the state detection sensor node 2 determines in s13 that the swing of the mounting position of the trigger detection sensor 100 is larger than the predetermined swing, the drive power source for the state detection sensor control circuits 22, 23, and 24 is determined. Supply is started (s14). Thereby, in the state detection sensor node 2, the state detection sensor 101 connected to the state detection sensor control circuits 22, 23, and 24 is activated, and the state detection sensor 101 starts sensing the physical quantity to be measured. The state detection sensor node 2 processes the sensing signal input from the state detection sensor 101 connected to the state detection sensor control circuits 22, 23, and 24, and acquires sensing data. The state detection sensor node 2 temporarily stores the acquired sensing data in the storage unit 26.

  In addition, the state detection sensor node 2 triggers when the state detection sensor 101 connected to the state detection sensor control circuits 22, 23, and 24 performs sensing for a certain time (for example, several seconds to several tens of seconds) (s15). The supply of drive power to the detection sensor control circuit 21 and the state detection sensor control circuits 22, 23, 24 is stopped (s16). Thereby, in the state detection sensor node 2, the trigger detection sensor 100 connected to the trigger detection sensor control circuit 21 and the state detection sensor 101 connected to the state detection sensor control circuits 22, 23, 24 are stopped. , The sensing of the physical quantity to be measured by the state detection sensor 101 started in s14 is terminated. The state detection sensor node 2 transmits the sensing data acquired during s14 to s16 to the data processing device 3 (s17), and returns to s11.

  If the state detection sensor node 2 does not determine in step s13 that the swing of the mounting position of the trigger detection sensor 100 is greater than the predetermined swing, supply of drive power to the trigger detection sensor control circuit 21 is performed. Is stopped (s18), and the process returns to s11.

  Next, with reference to FIG. 8, the second measurement process applied to the state detection sensor node 2 will be described. The state detection sensor node 2 waits to receive a trigger signal instructing the start of sensing from the trigger sensor node 1 constituting the monitoring device M (s21). In s21, it waits for the trigger sensor node 1 to receive the trigger signal instructing the start of sensing output in s4 described above.

  When the state detection sensor node 2 receives a trigger signal instructing the start of sensing from the trigger sensor node 1 in s21, the state detection sensor node 2 starts to supply drive power to the state detection sensor control circuits 22, 23, and 24 (s22). Thereby, in the state detection sensor node 2, the state detection sensor 101 connected to the state detection sensor control circuits 22, 23, and 24 is activated, and the state detection sensor 101 starts sensing the physical quantity to be measured. The state detection sensor node 2 processes the sensing signal input from the state detection sensor 101 connected to the state detection sensor control circuits 22, 23, and 24, and acquires sensing data. The state detection sensor node 2 temporarily stores the acquired sensing data in the storage unit 26.

  When the state detection sensor node 2 performs sensing by the state detection sensor 101 connected to the state detection sensor control circuits 22, 23, 24 for a certain time (for example, several tens of seconds to several minutes) (s23), the state detection is performed. The supply of drive power to the sensor control circuits 22, 23, 24 is stopped (s24). As a result, the state detection sensor node 2 stops the state detection sensor 101 connected to the state detection sensor control circuits 22, 23, and 24, and ends the sensing of the physical quantity to be measured by the state detection sensor 101 started in s22. To do.

  The state detection sensor node 2 transmits the sensing data acquired during s22 to s24 to the data processing device 3 (s25), and returns to s21.

  As described above, the monitoring device M according to this example can accurately determine whether or not the elevated bridge is shaken due to the earthquake motion, so the sensing of the state of the elevated bridge that is shaken due to the earthquake motion is detected. This can be appropriately performed by the second measurement process of the sensor node 2. Further, in the first measurement process of the state detection sensor node 2, the state of the elevated road bridge swaying due to other than the earthquake motion is sensed. That is, it is possible to perform sensing of the physical quantity to be measured on the elevated road bridge by distinguishing between when the elevated road bridge is shaken by earthquake motion and when it is shaken elsewhere. The state detection sensor control circuits 12, 13, and 14 of the trigger sensor node 1, the trigger detection control circuit 21 of the state detection sensor node 2, and the state detection sensor control circuits 22, 23, and 24 Since the supply is temporarily performed, power consumption in the trigger sensor node 1 and one or a plurality of state detection sensor nodes 2 constituting the monitoring device M can be suppressed.

  In the above example, the state detection sensor node 2 is configured to drive the trigger detection sensor 100 when it is determined that the measurement timing is reached in s11. However, the trigger detection sensor 100 is configured to always drive. Also good. The state detection sensor node 2 configured as described above eliminates the steps related to s11, s12, and s18 related to the first measurement processing shown in FIG. If the magnitude of the shaking of the mounting position of the trigger detection sensor 100 in the elevated road bridge is larger than the magnitude of the predetermined shaking, the state detection sensor 101 can sense the state of the elevated road bridge.

  However, in s16, the state detection sensor node 2 does not stop the drive power supply to the trigger detection sensor control circuit 21 (the drive power supply to the state detection sensor control circuits 22, 23, and 24 stops).

  In addition, the state detection sensor node 2 determines that s15 in the above example is greater than the predetermined swing magnitude (second shake threshold) in which the magnitude of the shake of the mounting position of the trigger detection sensor 100 on the elevated road bridge is predetermined. If it is not replaced with the step of determining whether or not it is large, it is determined in s15 that the amplitude of the mounting position of the trigger detection sensor 100 in the elevated road bridge is larger than a predetermined amplitude, and the procedure proceeds to s16. Also good.

  In this case, in s15, the maximum absolute value of sensing data (physical quantity for trigger) such as acceleration and displacement sensed by the trigger detection sensor 100 over a certain period of time (several tens of ms to 1 second) is set to the second value. The value may be compared with the threshold value of the vibration, or the difference between the maximum and minimum values of sensing data (physical quantity for trigger) such as acceleration and displacement measured over a certain period of time (several tens of ms to 1 second) (In other words, the magnitude of the amplitude) may be a value that is compared with the second shaking threshold, or sensing of acceleration, displacement, etc. sensed by the trigger detection sensor 100 over a certain period of time (several tens of ms to 1 second). An average value of absolute values of data (physical quantity for trigger) may be a value to be compared with the second fluctuation threshold. The second fluctuation threshold value used in s15 is set according to the type of value to be compared with the second fluctuation threshold value. In addition, the second shaking threshold is set to a value smaller than the first shaking threshold used in s13.

  In addition, when the state detection sensor node 2 determines in s15 that a certain time has elapsed, or when the magnitude of shaking of the mounting position of the trigger detection sensor 100 on the elevated road bridge is larger than a predetermined magnitude of shaking. If not determined, the process may proceed to s16.

  Furthermore, the state detection sensor node 2 performs the first measurement process in which the steps relating to s11, s12, and s18 in the process illustrated in FIG. 7 described above are eliminated, and the first measurement illustrated in FIG. 9 described later. The process may be executed in parallel.

  The trigger sensor node 1 may not include the state detection sensor control circuits 12, 13, and 14. Further, the state detection sensor node 2 may not include the trigger detection sensor control circuit 21. In this case, the first measurement process described above may not be performed, or the first measurement in which the steps relating to s12, s13, and s18 illustrated in FIG. 7 are deleted as illustrated in FIG. It is good also as a structure which performs a process. In FIG. 9, the same step numbers are assigned to steps having the same contents as the steps shown in FIG. However, the trigger detection sensor 100 is not included in the sensors related to the processes of s16 and s17.

  In addition, the state detection sensor node 2 is executing the first measurement process described above from the viewpoint of sensing the amount of the measurement object on the elevated road bridge when the state is preferentially shaken by the earthquake motion. When receiving a trigger signal instructing the start of sensing from the trigger sensor node 1, it is preferable that the second measurement process is executed by interruption.

  Further, the state detection sensor node 2 constituting the monitoring device M may perform the first measurement process in synchronization. In this case, if any of the state detection sensor nodes 2 constituting the monitoring device M determines that the shaking is large in s13, a synchronization signal is transmitted to the other state detection sensor nodes 2, and this synchronization signal is The received state detection sensor node 2 may be configured to execute the processing after s14 related to the first measurement processing.

  Moreover, the process of the trigger sensor node 1 shown in FIG. 6 may be changed to the process shown in FIG. 10, and the second measurement process related to the state detection sensor node 2 shown in FIG. 8 may be changed to the process shown in FIG. . In FIG. 10, steps having the same contents as the steps shown in FIG. 6 are given the same step numbers. In FIG. 11, the same step numbers are assigned to steps having the same contents as the steps shown in FIG.

  The processing according to FIG. 10 is obtained by replacing s5 described above with s31 and s32. Further, the processing according to FIG. 11 is obtained by replacing s23 described above with s41.

Specifically, when the trigger sensor node 1 performs the processes related to s1 to s4 described above, the trigger sensor node 1 waits for the shaking due to the earthquake motion at the mounting position of the trigger detection sensor 100 on the elevated road bridge to stop (s31). In s31, it determines using the sensing data acquired by processing the sensing signal input from the trigger detection sensor 100 to which the trigger detection sensor control circuit 11 is connected. In s 31, for example, if the trigger sensor 100 is an acceleration sensor, if not greater than the stop threshold acceleration a sensing data is predetermined, shaking by earthquake motion of the mounting position of the trigger detection sensor 100 in the elevated road bridges Is determined to have stopped. When the trigger detection sensor 100 is a displacement amount sensor, if the displacement amount, which is sensing data, is not greater than a predetermined stop threshold, the shaking due to the earthquake motion at the mounting position of the trigger detection sensor 100 on the elevated road bridge stops. It is determined that

  In s31, a value that compares the maximum absolute value of sensing data (trigger physical quantity) such as acceleration and displacement sensed by the trigger detection sensor 100 over a certain period of time (several tens of ms to 1 second) with a stop threshold. Or the difference between the maximum and minimum values of sensing data (trigger physical quantity) such as acceleration and displacement measured over a certain period of time (several tens of ms to 1 second) (that is, the magnitude of the amplitude) ) May be a value to be compared with the stop threshold, or the absolute value of sensing data (physical quantity for trigger) such as acceleration and displacement sensed by the trigger detection sensor 100 over a certain period of time (several tens of ms to 1 second). It is good also as a value compared with the stop threshold value. The stop threshold value used in s31 is set according to the type of value to be compared with this stop threshold value. The stop threshold is set to a value smaller than the detection threshold used in s2.

  If the trigger sensor node 1 determines that the shaking due to the earthquake motion at the mounting position of the trigger detection sensor 100 on the elevated road bridge has stopped in s31, the trigger sensor node 1 stops the sensing for the state detection sensor node 2 constituting the monitoring device M. A trigger signal to be instructed is transmitted (output) from the wireless communication unit 17 (s32), and the processes related to s6 and s7 described above are performed.

  In addition, when the processing of s21 and s22 described above is performed, the state detection sensor node 2 waits to receive a trigger signal instructing to stop sensing from the trigger sensor node 1 (s41). When the state detection sensor node 2 receives the trigger signal instructing to stop sensing from the trigger sensor node 1, the state detection sensor node 2 performs the above-described processing of s24 and s25.

  In the processing shown in FIG. 10 and FIG. 11, sensing of the state of the elevated bridge by the state detection sensor node 2 can be performed over a period in which the elevated bridge is shaken by the earthquake motion.

  Further, as shown in FIG. 12, a plurality of state detection sensor nodes 2 constituting the monitoring device M may be attached separately to a first wireless communication area and a second wireless communication area. The first wireless communication area and the second wireless communication area partially overlap each other. The first wireless communication area is an area where the trigger sensor node 1 can perform wireless communication. The second wireless communication area is a range in which the state detection sensor node 2 attached at a position where the first wireless communication area and the second wireless communication area overlap each other can perform wireless communication.

  In this configuration, the trigger sensor node 1 transmits the trigger signals related to s4 and s7 described above to the state detection sensor node 2 located in the first wireless communication area. In addition, the state detection sensor node 2 attached to the position where the first wireless communication area and the second wireless communication area overlap is changed to the state detection sensor node 2 attached in the second wireless communication area. The trigger signal transmitted from the trigger sensor node 1 is transferred.

Thereby, each state detection sensor node 2 can execute the processing shown in FIG. Since it wider range of attaching a plurality of state detection sensor nodes 2 constituting the monitoring device M, thereby improving the degree of freedom of the position to attach the status detection sensor node 2. In addition, since the number of state detection sensor nodes 2 included in the monitoring device M can be increased, the number of monitoring devices M required to detect the state of the building can be reduced (the number of trigger sensor nodes 1 can be reduced). Can be reduced.)

  In the example shown in FIG. 12, the state detection sensor node 2 located in the first wireless communication area is the state detection sensor node 2 belonging to the first group referred to in the present invention, and the second wireless communication. The state detection sensor node 2 located in the area is the state detection sensor node 2 belonging to the second group referred to in the present invention. The state detection sensor node 2 attached to the position where the first wireless communication area and the second wireless communication area overlap each other belongs to the first group.

  Further, the connection between the trigger sensor node 1 and the state detection sensor node 2 belonging to the first group, or the state detection sensor node 2 belonging to the first group and the state detection sensor node 2 belonging to the second group. The connection to is not limited to wireless and may be wired.

  The data processing device 3 collects the sensing data transmitted by the trigger sensor node 1 in s7 and the sensing data transmitted by each state detection sensor node 2 in s17 and s25, analyzes these sensing data, and performs measurement. The state of the elevated road bridge that is the target structure is judged.

  The trigger sensor node 1 may vary the trigger signal instructing the start of sensing and the state detection sensor node 2 to be transmitted in accordance with the magnitude of the shaking caused by the earthquake motion. In addition, the trigger sensor node 1 may transmit a trigger signal for instructing the start of sensing or transmission according to the detection frequency of shaking due to earthquake motion.

  Moreover, it is preferable that the trigger detection sensor 100 connected to the trigger sensor node 1 is attached at a position where it can be accurately detected that the structure to be measured is shaken by the earthquake motion. That is, if the position where the vibration of the earthquake motion can be detected with high accuracy is a position above the above-described support or a position relatively high from the ground, it is preferable to attach to that position.

M ... Monitoring device 1 ... Trigger sensor node 2 ... State detection sensor node 3 ... Data processing device 4 ... Data server 5 ... External server 10, 20 ... Control unit 11, 21 ... Trigger detection sensor control circuit 12, 13, 14 , 22, 23, 24 ... state detection sensor control circuits 15, 25 ... timers 16, 26 ... storage units 17, 27 ... wireless communication units 18, 28 ... power supply units 18a, 28a ... battery 100 ... trigger detection sensor 101 ... state detection Sensor

Claims (9)

A state detection sensor node to which a state detection sensor attached to the structure for sensing a physical quantity to be measured on the structure is connectable; and
A first trigger detection sensor attached to the structure is connected to sense a first trigger physical quantity used to determine a sensing period in which the state detection sensor senses the measurement target physical quantity applied to the structure. A trigger sensor node that is possible,
The structure has an upper structure, a lower structure that supports the upper structure, and a support that absorbs vibration provided between the upper structure and the lower structure,
It said first trigger detection sensor is attached to the substructure of the structure, as the first trigger physical quantity, a sensor for sensing such physical quantities shaking before Symbol structure,
The trigger sensor node is:
Processing the first trigger physical quantity sensed by the first trigger detection sensor to determine whether the structure is shaken by earthquake motion , and determining that the structure is shaken by earthquake motion, A timing determination unit that determines that it is the start timing of the sensing period;
When the timing determination unit determines that it is the start timing of the sensing period, an output unit that outputs the fact to the state detection sensor node,
The state detection sensor node is:
When the trigger sensor node inputs that it is the start timing of the sensing period, and when the preset measurement timing is reached, drive power is temporarily supplied to the state detection sensor A power supply unit to
A measurement target physical quantity acquisition unit that acquires the measurement target physical quantity applied to the structure by sensing by the state detection sensor to which the power supply unit temporarily supplies driving power ;
Further, the state detection sensor connected to the state detection sensor node is attached above the first trigger detection sensor connected to the trigger sensor node in the height direction of the structure. There is a monitoring device. The monitoring apparatus according to claim 1, wherein the structure is a bridge. The trigger sensor node is:
The timing determination unit processes the first physical quantity for trigger sensed by the connected first trigger detection sensor after outputting that the output unit is the start timing of the sensing period. When it is determined that the structure is not shaken by the earthquake motion, it is determined that it is the end timing of the sensing period,
When the output determination unit determines that the timing determination unit is the end timing of the sensing period, the output unit outputs the fact to the sensor node for state detection.
The monitoring device according to claim 1 or 2 . Said trigger sensor node, wherein the state detection sensor nodes, wireless communication by performing input and output, the monitoring device according to any one of claims 1-3. The status detection sensor nodes, a first group communicating with the trigger sensor node, and a second group communicating with the state detection sensor nodes belonging to the first group, with the claims 1-4 The monitoring apparatus in any one. The state detection sensor node can be connected to a second trigger detection sensor that senses a physical quantity related to shaking of the structure as a second trigger physical quantity,
The power supply unit supplies drive power to the second trigger detection sensor before temporarily supplying drive power to the state detection sensor at the measurement timing, and If the magnitude of the shaking of the structure obtained by processing the second trigger physical quantity sensed by the trigger detection sensor is not larger than a predetermined magnitude, the driving of the second trigger detection sensor is performed. The monitoring device according to any one of claims 1 to 5 , wherein supply of power is stopped and supply of drive power to the state detection sensor is temporarily stopped. The state detection sensor node is:
In the sensing period, and an output unit for outputting a measurement target physical quantity related to the structure and sensed by said state detection sensor that is connected, the monitoring device according to any one of claims 1-6. The monitoring device according to claim 7 , and a host device that collects a physical quantity to be measured for the structure output by the monitoring device,
A monitoring system comprising:
The host device is
The state detection sensor node includes an analysis unit that processes a measurement target physical quantity of the structure sensed by the state detection sensor during the sensing period and analyzes the state of the structure.
Monitoring system. A state detection sensor node to which a state detection sensor attached to the structure for sensing a physical quantity to be measured on the structure is connectable; and
A trigger detection sensor attached to the structure can be connected to sense a trigger physical quantity used to determine a sensing period for sensing the measurement target physical quantity of the structure by the state detection sensor. A sensor node for triggering,
The structure has an upper structure, a lower structure that supports the upper structure, and a support that absorbs vibration provided between the upper structure and the lower structure,
Said first trigger detection sensor, the mounting on the substructure, said the first trigger physical quantity, Ri sensor der for sensing such physical quantities shaking before Symbol structure, the state detecting sensor of the structure The monitoring method in the monitoring device, wherein the state detection sensor connected to the node is attached above the first trigger detection sensor connected to the trigger sensor node in the height direction of the structure. Because
The trigger sensor node is
When the physical quantity for trigger sensed by the connected trigger detection sensor is processed to determine whether or not the structure is shaken by earthquake motion , and when it is determined that the structure is shaken by earthquake motion, the sensing period A timing determination step for determining that it is the start timing of
If it is determined in the timing determination step that it is the start timing of the sensing period, an output step for outputting the fact from the output unit to the state detection sensor node is performed.
The state detection sensor node is
When the trigger sensor node inputs that it is the start timing of the sensing period, and when the preset measurement timing is reached, drive power is temporarily supplied to the state detection sensor Power supply step to perform,
A measurement target physical quantity acquisition step of acquiring the measurement target physical quantity applied to the structure by sensing with the state detection sensor that temporarily supplies drive power in the power supply step;
Monitoring method.

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