JP2016167193A - Operation determination method and operation monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a calculation amount of an operation monitoring system for determining operation of a target apparatus.SOLUTION: An operation monitoring system 1 monitors operation of a wind power generating facility 5. The operation monitoring system 1 includes a vibration sensor terminal 2 installed in the wind power generating facility 5. The vibration sensor terminal 2 includes a vibration sensor 2a for measuring vibration data of the wind power generating facility 5 and an operation determination unit 2b for determining operation of the wind power generating facility 5 on the basis of measurement data of the vibration sensor 2a. The operation determination unit 2b counts the number (namely, an operation determination value (γ)) of measurement data exceeding an exclusion threshold (W) from a center value (C) of measurement data measured when the wind power generating facility 5 is not operated, and when the operation determination value (γ) exceeds an operation determination threshold (NC), determines operation of the wind power generating facility 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an operation determination method and an operation monitoring system. In particular, the present invention relates to an operation monitoring system using a vibration sensor.

  In order to perform device deterioration diagnosis and device operation determination, a target device is provided with a sensor, and deterioration diagnosis and device operation determination are performed based on measurement data of the sensor (for example, Patent Document 1, Patent Document 1). 2).

  For example, in Patent Document 1, a sensor is provided in the equipment for diagnosis of deterioration of the equipment, and the deterioration is determined based on the measured value of the sensor.

  Moreover, in patent document 2, it is determined whether a vehicle, a motorbike, etc. are a stop state based on the measured value of an acceleration sensor or an angular velocity sensor.

JP-A-2005-250930 JP 2012-173143 A JP 2005-250985 A

  However, in the operation determination of facility equipment based on sensor measurement data, if the amount of calculation for operation determination increases, there is a possibility that the apparatus for performing the operation will be enlarged or the power consumption may be increased.

  In view of the above circumstances, an object of the present invention is to provide an operation determination method and an operation monitoring system that contribute to a reduction in a calculation amount for performing operation determination.

  The operation determination method of the present invention that achieves the above object is an operation determination method in which a target device is provided with a vibration sensor, and operation determination of the target device is performed based on measurement data of the vibration sensor, which is measured by the vibration sensor. The measurement data within a predetermined range is excluded from the reference value of the measurement data measured when the target device is not in operation from the measured data, and the data exceeding the predetermined range from the reference value Based on the occurrence frequency, the operation of the target device is determined.

  The operation monitoring system of the present invention that achieves the above object is an operation monitoring system having a terminal that performs operation determination of a target device, the terminal including a vibration sensor that measures vibration data of the target device, An operation determination unit configured to determine operation of the target device based on measurement data of the vibration sensor, and the operation determination unit is configured to operate the target device based on the measurement data measured by the vibration sensor. Exclude measurement data within a predetermined range from the reference value of measurement data measured when there is no data, and determine whether the target device is operating based on the frequency of occurrence of data exceeding the predetermined range from the reference value It is characterized by performing.

  According to the above invention, it is possible to contribute to a reduction in the amount of calculation for performing operation determination.

It is a figure showing an outline of an operation monitoring system concerning an embodiment of the present invention. It is a figure which shows the outline of a vibration sensor terminal. It is a figure which shows the outline of a relay communication terminal. It is a figure which shows the outline of an aggregation terminal. It is a figure which shows the communication system structure (mesh connection) of the operation | movement monitoring system which concerns on embodiment of this invention. It is a figure which shows the communication system structure (star connection) of the operation | movement monitoring system which concerns on embodiment of this invention. It is explanatory drawing explaining the exclusion threshold value (W) and operation determination threshold value (NC) of an operation determination method. It is a flowchart of the operation determination method in the operation monitoring system according to the embodiment of the present invention. (A) The figure which shows the distribution of acceleration when the wind power generation equipment is not operating, (b) The figure which shows the distribution of acceleration when the wind power generation equipment is operating. (A) The figure which shows distribution of acceleration (after the process by exclusion threshold value (W)) when a wind power generation facility is not operating, (b) Distribution of acceleration (exclusion when a wind power generation facility is operating) It is a figure which shows (after the process by a threshold value (W)).

  An operation determination method and an operation monitoring system according to an embodiment of the present invention will be described in detail with reference to the drawings. In the description of the embodiment, an example of determining whether or not the wind power generation facility is operating will be described, but the present invention is not limited to the form applied to the wind power generation facility, for example, Applicable to the operation judgment of heavy machinery for construction, vehicles or freight cars.

  As shown in FIG. 1, the operation monitoring system 1 according to the embodiment of the present invention includes a vibration sensor terminal 2, a relay communication terminal 3, and an aggregation terminal 4.

  The vibration sensor terminal 2 is provided on the inner peripheral surface of the tower of the wind power generation facility 5, for example. The vibration sensor terminal 2 includes a vibration sensor 2a, an operation determination unit 2b, and a communication unit 2c.

  As shown in FIG. 2, the vibration sensor 2a is connected to the operation determination unit 2b directly or via a communication link 6 such as an I2C bus. The operation determination unit 2b determines whether or not the wind power generation facility 5 is operating based on the measurement data of the vibration sensor 2a. The determination result is transmitted to the communication unit 2c (for example, a wireless module), and is transmitted from the communication unit 2c to the relay communication terminal 3. The operation determination unit 2b is driven by a power source 7 and a battery / environmental power generation power source 8 (for example, an energy harvesting power source that converts energy such as light, temperature difference, and vibration into electric power). The power source 7 receives an output of an external power source such as a battery / energy harvesting power source 8 and stably supplies a circuit voltage to the operation determination unit 2b (or a control unit 3b or a control unit 4c described in detail later). This is a stabilized power supply circuit.

  The vibration sensor 2a is, for example, an acceleration sensor. Examples of the acceleration sensor include a piezoelectric type, an overcurrent type, and a capacitance type acceleration sensor. When the vibration sensor 2a detects accelerations in the three-axis directions of the three-dimensional orthogonal coordinates, no matter how the vibration sensor terminal 2 is installed on the wind power generation facility 5, the vibration sensor 2a is based on the vibration detected by the vibration sensor 2a. The operating state of the wind power generation facility 5 can be determined. Furthermore, if a 9-axis sensor incorporating an angular velocity sensor and a geomagnetic sensor is used as the vibration sensor 2a in addition to the acceleration sensor, gravity, vibration, movement, and impact can be detected. In addition, the vibration sensor 2a and a low power consumption microcomputer can be combined to provide an acceleration sensor that is reduced in size and power consumption by a MEMS (Micro Electro Mechanical System) technology.

  The operation determination unit 2b determines whether or not the wind power generation facility 5 is operating based on the measurement data of the vibration sensor 2a.

  The communication unit 2 c transmits the determination result data of the operation determination unit 2 b and the acceleration data used for the determination to the relay communication terminal 3.

  The relay communication terminal 3 transmits the determination result received from the vibration sensor terminal 2 to the aggregation terminal 4. As shown in FIG. 3, the relay communication terminal 3 includes a communication unit 3a. The communication unit 3 a is controlled by the control unit 3 b, receives data such as determination results from the vibration sensor terminal 2, and transmits this data to the aggregation terminal 4. The control unit 3b is driven by the power source 7 and the battery / energy generation power source 8.

  The aggregation terminal 4 receives the data transmitted from the relay communication terminal 3. The aggregation terminal 4 transmits the received data to an upper network that manages the wind power generation facility 5. As shown in FIG. 4, the aggregation terminal 4 includes a communication unit 4a (for example, a wireless module) that receives data transmitted from the relay communication terminal 3, and a higher-level communication module 4b that transmits the received data to a higher-level network. (For example, Ethernet 7 (registered trademark)). The communication unit 4a and the higher-level communication module 4b are controlled by the control unit 4c. The control unit 4 c is driven by the power source 7 and the battery / energy harvesting power source 8.

  The operation monitoring system 1 monitors the operation state of the plurality of wind power generation facilities 5. That is, the operation monitoring system 1 has a plurality of vibration sensor terminals 2. Therefore, the operation monitoring system 1 has a communication system in which the vibration sensor terminal 2 transmits the operation determination result to the aggregation terminal 4 via the relay communication terminal 3 corresponding to each vibration sensor terminal 2. The operation monitoring system 1 includes, for example, a communication system 9 having a mesh configuration that is not confined to a physical arrangement form as shown in FIG. 5 and a communication system 10 having a star connection as shown in FIG.

  In the communication system 9 having a mesh configuration, the relay communication terminal 3 is connected to the aggregation terminal 4 via another relay communication terminal 3. The vibration sensor terminal 2, the relay communication terminal 3, and the aggregation terminal 4 are configured to communicate with each other wirelessly. In this communication system 9, data such as an operation determination result transmitted from the vibration sensor terminal 2 is transmitted to the aggregation terminal 4 via the relay communication terminal 3 to which the vibration sensor terminal 2 is connected and the other relay communication terminal 3. Will be sent.

  In the star-connected communication system 10, a plurality of relay communication terminals 3 are connected to the aggregation terminal 4, and the vibration sensor terminal 2 is connected to each relay communication terminal 3 at 1: 1. However, a plurality of vibration sensor terminals 2 can be connected to the relay communication terminal 3. In this communication system 10, data such as an operation determination result transmitted from the vibration sensor terminal 2 is directly transmitted to the aggregation terminal 4 via the relay communication terminal 3.

  The transmission timing of communication data in these communication systems 9 and 10 can be transmitted at any time if the operation monitoring system 1 is always in a movable state. In addition, when the operation monitoring system 1 operates intermittently, in each vibration sensor terminal 2, each relay communication terminal 3, and the aggregation terminal 4, two terminals that require communication are activated in synchronization and transmitted during that time. The side transmits communication data to the receiving side. In addition, it is preferable that the information transmission route of each terminal 2, 3 and 4 is wireless communication, so that no wiring work is required.

[Operation judgment method]
Next, the operation determination method of the operation monitoring system 1 according to the embodiment of the present invention will be described in detail. In the operation monitoring system 1, within the vibration sensor terminal 2, the vibration sensor 2a measures acceleration for a certain period, and analyzes (statistical processing) the distribution of acceleration measured by the operation determination unit 2b. And the vibration of the windmill tower wall of the wind power generation equipment 5 is evaluated by statistical processing of acceleration, and the operation determination of the wind power generation equipment 5 is performed. That is, the vibration transmitted from the windmill (rotary body) to the windmill tower wall is detected using the acceleration sensor, and the operation of the wind power generation facility 5 is determined based on the detected vibration.

  Since the wind power generation facility 5 operates as a fixed rotating body, the aggregated acceleration distribution can be approximated to a normal distribution. The normal distribution has a bell-shaped distribution that is symmetrical about the average.

In the operation determination method according to the embodiment of the present invention, assuming that the distribution of the acquired acceleration data is a normal distribution, the maximum (max), the average value (μ), the minimum value (min), the center value (C), Standard deviation (σ) is processed. Deviation (x _i -m) is evaluated as a parameter from this distribution state. That is, the operation determination is performed by evaluating the amount of difference between the average value of acceleration data (or a reference value such as the median value of acceleration data) and the measured value of acceleration data.

  As a numerical value (representative value of data) summarizing the entire data in the normal distribution, there is a value indicating the central position of the distribution such as an average value (μ), a median value (C), or a mode value (Mo). The average value (μ) is a value used when the numerical data has symmetry, and is calculated by the equation (1). The median value (C) is a value that becomes the center (50%) when the acquired data is rearranged in the order of the data size, and is used when the distribution is not symmetric even with order variables and numerical data. The mode value (Mo) is a value having the highest frequency (frequency). When the data has a normal distribution, the average value (μ) = median value (C) = mode value (Mo).

Average value (Mo) = total / number of samples (1)
The standard deviation (σ) is the distance from the mean value (μ) to the inflection point of the distribution. The square of the difference (deviation) between the data and the mean value (μ) is averaged, and this is the same dimension as the variable The square root is taken to show. The value before taking the square root (the square of the standard deviation) is referred to as variance (σ ² ).

  In the normal distribution, the average value (μ) ± 1σ = 0.6827, and this range includes about 68% of the data. Further, the average value (μ) ± 2σ = 0.9545, and about 96% of the data is included. Furthermore, the average value (μ) ± 3σ = 0.9973, which includes about 99% of the data.

  As shown in FIG. 7, the median value (C) (or the average value (μ)) is obtained, and the exclusion threshold value (W) is set in advance, so that the aggregated data becomes the median value (C). Various accelerations exceeding the range of the exclusion threshold (W) can be detected. In other words, assuming that the target device is in operation and the vibration is increased and the detected acceleration is diversified, it is determined whether the target device is in operation by detecting various accelerations. be able to.

  Therefore, the acceleration occurrence frequency (V) having a value exceeding the median (C) ± W (W1 to W2) in the acceleration data collected in a certain period is counted as the operation determination value (γ), and this operation determination value When (γ) exceeds the operation determination threshold value (NC), it is possible to determine that the target device is in an operation state. In other words, when the target device is not operating, the acceleration spread state in the normal state is considered to be stable with a normal distribution, but when the target device is operating, the vibration component represented by the operating state is the normal state. It can be detected as a different acceleration, and it is considered that the operating state of the target device can be determined by this difference.

  Therefore, in order to perform operation determination, an exclusion threshold value (W) and an operation determination threshold value (NC) are set in advance. The exclusion threshold (W) and the operation determination threshold (NC) can be changed by setting according to the target device and the installation environment of the target device.

  The exclusion threshold (W) is a threshold for excluding environmental influences. The dispersion (spreading) of acceleration changes depending on the vibration state in the environment where the target device is placed. Therefore, if the exclusion threshold (W) is set to satisfy σ ≦ | W | ≦ 2σ, for example, based on σ calculated when the target device is in a stopped state, the accuracy of operation determination is not impaired. The amount of calculation for operation determination can be reduced.

  The operation determination threshold value (NC) is a threshold value that determines the sensitivity of operation determination, and the frequency of occurrence of acceleration having a value where the acceleration exceeds the median value (C) ± W (that is, the range of W1 to W2) ( V) is a value indicating a criterion for determining operation. As the operation determination threshold value (NC), for example, a value (for example, 80 times or the like) that can distinguish the difference between the stop time and the operation time is appropriately set.

  Note that when performing the operation determination of the target device, it is necessary to obtain the median value (C) of acceleration data in a state where the target device is not vibrating. As for the median value (C), there are a method of calculating the median value (C) from the acceleration data acquired at the time of activation and a method of setting a preset fixed value as the median value (C). When calculating the median value (C), assuming that the distribution of the collected acceleration data is a normal distribution, the median value (C) can be derived from the average value (μ), and the median value (C) is calculated. The amount is reduced. Further, the fixed value set as the median value (C) can be arbitrarily set, and for example, the mode value (Mo) can also be set.

[Example 1]
The operation determination method in the operation monitoring system 1 according to the embodiment of the present invention will be specifically described with reference to FIG. In Example 1, a 16-bit ± 2g mode acceleration sensor was mounted on the vibration sensor 2a. That is, since 2g / 2 ¹⁶ = 0.06 mg, the acceleration sensor has a resolution of 0.06 mg / LSB.

  First, the vibration sensor 2a collects acceleration data for a predetermined period. Specifically, 4096 times of data acquisition were performed continuously at a cycle of 1 millisecond (1 kHz). In addition, it is considered that an expected distribution is obtained as the data collected by the vibration sensor 2a increases. However, when data acquisition is performed at a cycle of 1 millisecond, since only 1000 times can be sampled per second, the number of acceleration data to be collected is determined in consideration of the measurement time. In this example, the vibration sensor 2a acquired data 4096 times in a measurement time of 4 seconds (step S1).

  In addition, a median value (C) serving as a determination criterion was calculated in advance, and an exclusion threshold value (W) and an operation determination threshold value (NC) were set. The median value (C) was the average value (μ) of acceleration data measured in a state where the wind power generation facility 5 was not operating. The average value (μ) was 0.051734. The exclusion threshold (W) was set to 0.012, and the operation threshold (NC) was set to 80 (step S2).

  Next, the operation determination unit 2b acquires one acceleration from the collected acceleration data (step S3).

  The operation determination unit 2b determines whether or not the acquired acceleration value deviates from the range of the median value (C) ± W (step S4). When the acquired acceleration value deviates from the range of the median value (C) ± W, the number of acceleration samples having a value deviating from the median value (C) ± W range (that is, the operation determination value (γ)) ) Is increased by one (step S5). Then, the operation determination unit 2b determines whether or not there is an unevaluated acceleration (step S6). On the other hand, when the acquired acceleration value is within the range of the median value (C) ± W, the operation determination unit 2b determines whether or not there is an unevaluated acceleration (step S6). In step S6, if there is unevaluated acceleration data, the unevaluated acceleration data is evaluated (step S3).

  In step S6, if there is no unevaluated acceleration data, the operation determination unit 2b determines that the number of acceleration samples having a value outside the range of the median value (C) ± W (that is, the operation determination value (γ)) It is determined whether or not the operation determination threshold value (NC) has been exceeded (step S7). When the operation determination value (γ) exceeds the operation determination threshold value (NC), the operation determination unit 2b determines that the wind power generation facility 5 is operating (step S8), and the communication unit 2c operates. The determination result and the data used for operation determination are transmitted to the aggregation terminal 4 via the relay communication terminal 3. On the other hand, when the operation determination value (γ) does not exceed the operation determination threshold value (NC), the operation determination unit 2b determines that the wind power generation facility 5b is stopped (step S9), and the communication unit 2c. However, the stop determination result and the data used for the operation determination are transmitted to the aggregation terminal 4 via the relay communication terminal 3.

  FIG. 9 is a diagram showing an acceleration occurrence frequency distribution when the wind power generation facility 5 is not operating and an acceleration occurrence frequency distribution when the wind power generation facility 5 is operating.

  From this figure, when the wind power generation facility 5 is in operation and vibration is generated, the acceleration distribution is widened by the distribution of the acceleration being dispersed (the standard deviation is increased). As a result, the number of data that falls within a certain range (exclusion threshold (W)) around the reference value (median value (C)) is reduced. Therefore, it is considered that the operation of the wind power generation facility 5 can be determined by calculating the number of acceleration data deviating from a certain range centered on the reference value.

  That is, as shown in FIG. 10A, when the wind power generation facility 5 is not vibrating, the acceleration value falls within a certain range centered on the reference value. On the other hand, as shown in FIG. 10B, when the wind power generation facility 5 is operating, the number of acceleration samples having a value deviating from a certain range centered on the reference value increases. It becomes. Therefore, the operation determination of the wind power generation facility 5 can be performed from this difference.

  As described above, in the operation determination method according to the first embodiment, the number of acceleration samples having a value that exceeds the exclusion threshold (W) from the median (C) exceeds a certain amount (determination threshold (NC)). If), it can be determined that the wind power generation facility 5 is operating during that period.

  The operation determination includes, for example, arithmetic processing for calculating an average value (μ) of acceleration data collected in a state where the wind power generation facility 5 is not operating, an exclusion threshold (W), and acceleration data (instantaneous value). ) Subtraction process and the operation determination threshold value (NC) deviation number determination process. That is, since the operation determination can be performed with a small amount of calculation, the operation determination can be performed even with a CPU having a low performance.

  In addition, the operation determination method according to the first embodiment has less response to disturbance than the determination by sound or image, and can determine the operation of the wind power generation facility 5.

[Example 2]
In the operation determination method according to the second embodiment, the vibration sensor terminal 2 collects acceleration data in the three-axis (X axis, Y axis, Z axis) directions of three-dimensional orthogonal coordinates, and performs the operation determination on each axis. That is, the operation determination method according to the second embodiment is the same as the operation determination method according to the first embodiment except that the operation determination is performed with respect to the acceleration in the triaxial direction. Therefore, different parts will be described in detail.

  In the operation determination method according to the second embodiment, exclusion threshold values (Wx, Wy, Wz) are set for the accelerations in the X-axis, Y-axis, and Z-axis directions. In addition, operation determination threshold values (NCx, NCy, NCz) are set for the accelerations in the X-axis, Y-axis, and Z-axis directions.

  Then, the operation determination of the wind power generation facility 5 is performed on each of the X axis, the Y axis, and the Z axis, and the operation determination of the wind power generation facility 5 is performed based on the logical sum of each axis. That is, the operation determination unit 2b determines that the wind power generation facility 5 is operating when the determination result of at least one axial direction in the three-axis directions of the three-dimensional orthogonal coordinates is the operation determination.

  According to the operation determination method according to the second embodiment as described above, the vibration sensor terminal 2 acquires the acceleration in the three-axis (X / Y / Z) direction and determines the operation of the wind power generation facility 5. The operation determination of the wind power generation facility 5 can be performed regardless of the arrangement mode of the vibration sensor terminal 2.

  For example, in the operation determination of the wind power generation facility 5, the vibration sensor terminal 2 is installed on the wall inside the windmill, but the direction of the axis (X / Y / Z) of the acceleration sensor changes depending on the installation mode. Become. Therefore, when the operation determination is performed with the acceleration data of one axis, there is a possibility that the arrangement of the vibration sensor terminal 2 must be taken into account in order to perform an accurate operation determination. On the other hand, if operation determination is performed with respect to the three axes, there is no need to restrict the arrangement direction of the vibration sensor terminal 2, and the operation determination can be performed regardless of the arrangement mode of the vibration sensor terminal 2.

  As described above, the operation determination method and the operation monitoring system 1 according to the present invention can perform operation determination with a small amount of calculation, as described with reference to specific embodiments. That is, since the operation can be determined even with a CPU having a low performance, the vibration sensor terminal 2 can be reduced in size and reduced in power consumption.

That is, in the operation determination method and the operation monitoring system 1 of the present invention, by evaluating the deviation (x _i −m), that is, the difference amount between the average value (or the reference value such as the median value) and the measured value, Operation determination can be performed with a small amount of calculation.

  Further, by making the vibration sensor terminal 2 small and having low power consumption, the vibration sensor terminal 2 can be configured as a self-supporting terminal that is driven by a battery or an energy harvesting power supply 8 to cover the power supply. Further, each terminal (vibration sensor terminal 2, relay communication terminal 3 and aggregation terminal 4) is constructed by a CPU and peripheral circuits, etc., with low-consumption microcomputer technology and operated intermittently. And the maintenance frequency is reduced. Thus, the ease of installation of the terminals 2, 3, and 4 is improved by making the vibration sensor terminal 2 (the relay communication terminal 3 and the aggregation terminal 4) power-less. That is, it can be a small sensor terminal that does not require power supply work.

  Moreover, since the operation determination can be easily performed only by providing the vibration sensor terminal 2 for the target device (for example, the wind power generation facility 5), the operation determination is performed without increasing the influence on the existing facilities. be able to. That is, it is possible to construct a system that determines the operating state of the monitoring object without performing the work on the existing monitoring object without construction. In particular, the vibration sensor terminal 2 evaluates acceleration data in each coordinate direction of three-dimensional orthogonal coordinates, so that the degree of freedom of installation of the vibration sensor terminal 2 is improved.

  For example, in the wind power generation facility 5, there is a system that monitors power fluctuations in a wide-area natural energy power generation site, performs storage battery control intensively, and absorbs power fluctuations by a smoothing effect. In this system, the power generation amount at each power generation site is estimated from the weather forecast. However, there are many cases where the wind turbine is stopped without inspection (inspection, breakdown, etc.) for the convenience of the power generation company, and there is a difference between the estimated power generation amount and the actual power generation amount. For this reason, a mechanism for constantly monitoring the operating state of the windmill is required. In addition, in the wind power generation facility 5, it is often not permitted to install a sensor for determining whether or not it is operating directly in the operating part for reasons of management or the like. With respect to such a problem, the operation monitoring system 1 of the present invention can determine the operation of the wind power generation facility 5 without affecting the existing installation.

  Further, by collecting information on the operation determination result in the local network, it becomes possible to process the operation determination result in the cloud, the APL server, or the like via the access point. As a result, the operation monitoring system 1 can also automatically collect the operation presence / absence information of the target device.

  As described above, the operation determination method and the operation monitoring system of the present invention have been described in detail by showing specific embodiments, but the operation determination method and the operation monitoring system of the present invention are not limited to the embodiments, Design changes can be made as appropriate without departing from the characteristics of the invention, and the design changes are also included in the technical scope of the present invention.

  For example, in the description of the embodiment, the operation monitoring system has been described with reference to an example in which the vibration sensor terminal, the relay communication terminal, and the aggregation terminal are provided, but the functions of the vibration sensor terminal, the relay communication terminal, and the aggregation terminal are shared. You may implement | achieve by the concrete means with which hardware and software cooperated. In this case, the computer functions as a vibration sensor terminal, a relay communication terminal, or an aggregation terminal by software setting or software design.

  In addition, when the period for requesting the operation determination is long, for example, for several years, it is possible to extend the monitoring period of the limited battery by intermittently operating each terminal such as a vibration sensor terminal. In this case, each terminal is activated in synchronization and performs communication. That is, each terminal is activated (synchronized) at a preset time or according to a drive signal of the aggregation terminal (or relay communication terminal).

  In addition to acceleration, a sensor that measures displacement and speed can also be used as the vibration sensor.

1 ... Operation monitoring system 2 ... Vibration sensor terminal (terminal)
2a ... vibration sensor, 2b ... operation determination unit, 2c ... communication unit 3 ... relay communication terminal 3a ... communication unit, 3b ... control unit 4 ... aggregation terminal 4a ... communication unit, 4b ... host system communication module, 4c ... control unit 5 ... wind power generation equipment (target equipment)
6 ... Communication link 7 ... Power source 8 ... Battery / Energy generation power source 9 ... Communication system (mesh configuration)
10. Communication system (star connection)

Claims (7)

An operation determination method in which a vibration sensor is provided in a target device, and operation determination of the target device is performed based on measurement data of the vibration sensor,
From the measurement data measured by the vibration sensor, exclude measurement data within a predetermined range from a reference value of measurement data measured when the target device is not operating,
An operation determination method, wherein operation determination of the target device is performed based on an occurrence frequency of data exceeding a predetermined range from the reference value. The vibration sensor measures measurement data in three axial directions of three-dimensional orthogonal coordinates,
The operation determination method according to claim 1, wherein if the determination result based on at least one measurement data in the axial direction is an operation determination, it is determined that the target device is operating. The reference value is an average value of data measured in a state where the target device is not vibrating,
The operation determination method according to claim 1, wherein the predetermined range is set based on a deviation of data measured in a state where the target device is not vibrating. An operation monitoring system having a terminal that performs operation determination of a target device,
The terminal
A vibration sensor for measuring vibration data of the target device;
An operation determination unit that performs operation determination of the target device based on measurement data of the vibration sensor;
The operation determination unit
From the measurement data measured by the vibration sensor, exclude measurement data within a predetermined range from a reference value of measurement data measured when the target device is not operating,
An operation monitoring system, wherein the operation of the target device is determined based on an occurrence frequency of data exceeding a predetermined range from the reference value. The vibration sensor measures measurement data in three axial directions of three-dimensional orthogonal coordinates,
The operation monitoring system according to claim 4, wherein the operation determination unit determines that the target device is operating when a determination result based on at least one measurement data in the axial direction is an operation determination. . An aggregation terminal that receives the operation determination result of the terminal;
The operation monitoring system according to claim 4, further comprising a relay communication terminal that relays data transmitted from the terminal to the aggregation terminal. The operation monitoring system according to claim 4, wherein the target device is a wind power generation facility.

Images