KR101103555B1 - System for wireless inspecting bridge bearing using ubiquitous sensor network - Google Patents

Abstract

Intelligent Smart Sensors measure the displacement or movement of bridge devices, the bridge structures, using advanced ubiquitous sensor network (USN) technology, allowing unattended wireless bridge inspection system to determine in case of dangerous situation and notify administrators and bridge users in real time. This is provided. An unmanned wireless bridge inspection system using a ubiquitous sensor network includes a linear variable differential transducer (LVDT) for contacting one side of a bridge device and measuring displacement of the bridge device; A sensor interface module (SIM) for converting analog data measured by the LVDT into digital data; A wireless data logger acquiring digitally converted data via a sensor interface module; A data processing unit implemented as middleware and filtering necessary information from data acquired from a wireless data logger; And a wireless communication module for transmitting the digital data filtered by the data processor to an external system, wherein an LVDT, a sensor interface module, a wireless data logger, a data processor, and a wireless communication module are integrated to form a ubiquitous sensor network (USN). An intelligent smart sensor is used, and the intelligent smart sensor measures the displacement of the teaching device to self-determine the occurrence of a dangerous situation and notifies the external system in real time.

Chair, Inspection, Unmanned Wireless, LVDT, USN Sensor, Smart Sensor, CCTV

Description

Unmanned wireless bridge inspection system using ubiquitous sensor network {System for wireless inspecting bridge bearing using ubiquitous sensor network}

The present invention relates to the inspection of the bridge device, and more specifically, to the self-managed by measuring the displacement amount of the bridge device installed between the bridge and the bridge deck in the bridge structure, to improve the efficiency of the bridge inspection table ubiquitous sensor network It is about an unmanned wireless bridge inspection system that intelligently inspects bridges anytime and anywhere using USN technology.

1A and 1B illustrate a typical bridge structure in which a bridge arrangement is installed between a bridge and a bridge deck.

As shown in FIGS. 1A and 1B, the bridge is composed of a bridge 11 vertically installed at regular intervals, and a bridge top plate 12 horizontally placed on the bridge 11, and the bridge top plate 12. The bridge device 13 is installed between the bridge and the bridge 11 to relax and transmit the deformation of the bridge top plate 12 made of reinforcing steel and concrete. That is, the bridge device 13 is a device that is installed so that the bridge top plate 12, which is a slab structure of the bridge, is properly placed on the bridge 11 supporting it, various forms depending on the specifications and the supporting load of the bridge. And have a function.

In addition, unlike the building structure, the bridge structure is longer than the width, the length of the bridge top plate 12 due to the seasonal temperature change and crossover is severe. In particular, if there is a distinct four seasons as in Korea, the temperature range is large, if the temperature expansion and contraction of the bridge top plate 12 can not be accommodated may have a serious adverse effect on the bridge structure by the temperature stress. Therefore, the base of the buffer structure is installed in the upper portion of the bridge 11 so that the temperature stress does not work by receiving a horizontal displacement in accordance with the temperature change in the contact portion between the bridge top plate 12 and the bridge (11). In other words, when constructing a bridge, the pedestal should transmit the deformation and load of the upper structure of the bridge to the lower bridge structures such as bridges, bridges, etc. without affecting the upper structure as much as possible.

Therefore, the teaching device 13 should be compensated so as to take an equal load by continuously grasping the displacement amount during installation as well as after installation. Failure to compensate this will have a major negative impact on the safety of the bridge. Therefore, the bridge device 13 installed in the bridge should detect the displacement by the load from time to time, and compensate for this if the working load exceeds the allowable value. For this purpose, the displacement of the bridge system on the bridge inspection platform was visually measured using a tool such as ruler.

As described above, since the displacement value was calculated by using a rudimentary measuring tool such as a chair in a high and narrow space on the pier, each load value was calculated according to the displacement, so that the measured value was not accurate, cumbersome, and high and inaccessible. The metrology work was dangerous and inconvenient since the device 13 had to be accessed. In particular, since many bridge devices 13 are installed in one bridge, it takes a long time to check all of the bridge devices 13 in the manner described above.

As a related technology for solving the above-mentioned problem, Korean Patent Application No. 2000-80141 (filed December 22, 2000) is entitled "Measuring instrument and its system and bridge maintenance method using the same". The invention of the present invention is disclosed, which is provided at the upper part of the bridge supporting the upper plate of the bridge and receives the load and deformation of the upper plate by installing a device capable of measuring the load or displacement applied to the upper plate of the bridge, In order to enable this, it will be described with reference to FIG. 2 as follows.

2 is a view showing a system of a measuring instrument for measurement according to the prior art.

Figure 2 is installed on each bridge piers 13 and connected by wire or wireless to the load (pressure), horizontal (X, Y) and vertical (Z) displacement, temperature change measured in each of the bridge devices (13) After collecting and storing the electrical signal of the data in the data storage device 22, the entire bridge through the transmission and reception device 23 consisting of a transmission device 23 ', a transmission path (wired or wireless) and a receiving device 23 ". The data of the measuring instrument of the measuring device is transmitted to the data comparison and analysis device 24, the data received by the data comparison and analysis device 24 is stored and compared and analyzed, and the result of the comparative analysis monitor 25 And the alarm device 26 to generate an alarm sound for the numerical value of the comparative analysis result which is out of the normal value, where the data storage device 22 and the transmission device 23 'are bridged. Can be installed in the The circle uses solar cells and storage batteries so that no separate power source is required.

In this way, the load or displacement applied to the bridge top plate 12 can be measured on each bridge device 13 installed on the top of the bridge 11 supporting the top plate 12 of the bridge to receive the load and deformation of the top plate. A device is installed to enable continuous measurement, and data such as load (pressure), displacement (X, Y, Z), temperature, and the like measured by each of the teaching devices 13 are stored in the data storage device 22. Collected and stored, and then transmitted to a data comparison and analysis device 24 such as a bridge management control station that manages the bridge by wire or wirelessly through the transmission device 23 ', and the bridge received through the reception device 23 ". The data is analyzed by the data comparison analysis device 24. The data comparison analysis device 24 stores and manages data of an initial state (for example, when the bridge is completed). Received by the receiver 23 " By comparing and analyzing the data through the data analysis device, the structural change is confirmed, and when there is an error, the maintenance plan is taken and the cause is eliminated, thereby efficiently maintaining the bridge.

However, in the system of the measuring instrument according to the prior art described above, there is a problem that it is cumbersome because a measuring apparatus capable of measuring the load or displacement applied to the bridge deck must be installed directly on the teaching apparatus. There is a problem that maintenance is not easy.

On the other hand, as a related technology, Korean Patent Application No. 2003-12681 (Application Date: February 28, 2003) discloses an invention named "Study device equipped with an optical fiber sensor and a support load measuring method using the same" In order to easily measure the load acting on the bridge device installed between the upper plate and the bridge by installing the optical fiber sensor inside, the condition of each bridge device can be easily checked at any time to maintain the maintenance at the appropriate time and to ensure the safety of the bridge. As secured, it will be described with reference to FIG. 3 as follows.

Figure 3 is a cross-sectional view showing a disc (disc) type device with a fiber sensor according to the prior art.

The bridge device 30 is applied to the fixed end in a disk shape and mounted on the bridge 11. The pedestal device, that is, the pedestal 30 is configured via the elastic body 33 between the lower plate 31 and the upper plate 32. The elastic body 33 and the lower plate 31 drill a vertical center hole 44 at the center thereof, and a shear pin 43 is provided at the upper plate 32 corresponding thereto to be inserted into the vertical center hole 44. Combined. In this case, the shear pin 43 fixed to the upper plate 32 is vertically spaced apart from the lower portion of the vertical center hole 44 by the lower end of the vertical plate when the load of the bridge top plate 12 is transmitted to the upper plate 32. While descending from the central hole 44, the load of the upper plate 32 acts on the elastic body 33 to relieve the vertical load while the elastic body 33 is compressed. Therefore, the elastic body 33 is manufactured to a suitable thickness in consideration of the load and the displacement of the bridge to be installed.

 The optical fiber sensor 41 is installed in the lower space of the vertical center hole 44 formed by the bottom surface of the front end pin 43 and the lower plate 31 corresponding thereto, thereby bringing the signal line 41 to the outside of the chair device 30. The connection port 42 is provided in the bridge part which is pulled out and is easy to access. Therefore, the user can easily measure the displacement according to the load of the bridge device 30 through the optical fiber sensor 40 by connecting the system base to the connection port 42. More specifically, according to the load, the upper plate 32 compresses the elastic body 33 while the shear pin 43 descends and approaches the bottom of the vertical center hole 44, so that the optical fiber sensor 40 extends in the longitudinal direction. As the contraction is detected, the displacement of the elastic body 33 is measured.

As such, in general, the sensor 40 using the optical fiber is small in size, so that the sensor 40 is easily attached to the surface of the measurement object or embedded in the structure. Also, since the optical fiber is made of quartz, the sensor 40 is excellent in corrosion resistance and influenced by electromagnetic waves. Do not receive. In addition, because the processing speed is high, the measurement stability is high, and since the diameter of the optical fiber is 1 mm or less, there is an advantage that several sensors can be used in a small space depending on the measurement range and degree.

However, in the case of the teaching device 30 having the optical fiber sensor 40 according to the related art, there is a problem that it is difficult to implement wirelessly and is not easy to install.

The technical problem to be solved by the present invention for solving the above problems is, a bridge device installed between the bridge and the bridge deck using a Linear Variable Differential Transformer (LVDT) or using a Ubiquitous Sensor Network (USN) sensor and a laser light source To provide an unmanned wireless bridge inspection system using a ubiquitous sensor network capable of unmanned measurement of displacements.

Another technical problem to be achieved by the present invention is an unmanned wireless bridge inspection system using a ubiquitous sensor network that can wirelessly transmit the displacement of the measured measurement device using the LVDT or USN sensor and the laser light source and monitor the inspection result easily. It is to provide.

Another technical problem to be achieved by the present invention is to use an ubiquitous sensor network that can intelligently determine the displacement or movement of a bridge device, which is a bridge structure, by intelligent smart sensors to determine itself in case of a dangerous situation and to notify administrators and bridge users in real time. It is to provide an unmanned wireless test system.

As a means for achieving the above-described technical problem, the unmanned wireless bridge inspection system using the ubiquitous sensor network according to the present invention, the bridge inspection system for measuring and monitoring the displacement amount of the bridge device installed between the bridge and the bridge deck of the bridge structure A linear variable differential transformer (LVDT) for measuring a displacement of the teaching apparatus by contacting one side of the teaching apparatus; A sensor interface module (SIM) for converting analog data measured by the LVDT into digital data; A wireless data logger (Data Logger) for acquiring digitally converted data through the sensor interface module; A data processing unit implemented as middleware and filtering necessary information from data acquired from the wireless data logger; And a wireless communication module for transmitting the digital data filtered by the data processor to an external system.

Here, the LVDT, the sensor interface module, the wireless data logger, the data processor and the wireless communication module are integrated to form an intelligent smart sensor using a ubiquitous sensor network (USN), and the intelligent smart sensor measures the displacement of the teaching device. It is characterized by self-determination of the occurrence of a risk situation and real-time notification to the external system.

Here, one side of the LVDT is fixed to a cradle installed on the pier spaced a predetermined distance from the bridge device, the other side of the LVDT is characterized in that it measures when the displacement of the bridge device in contact with the bridge device.

The sensor interface module SIM may include an A / D converter for converting analog data measured from the LVDT into digital data.

Here, the external system, the monitoring system for monitoring the displacement of the teaching apparatus according to the digital data transmitted from the wireless communication module; A Voice Messaging System (VMS) for generating a voice message according to the digital data transmitted from the wireless communication module; And a traffic light control system for generating a control signal for controlling a traffic light around a bridge in which the bridge device is installed according to the digital data transmitted from the wireless communication module.

Here, the monitoring system is implemented as an AnyLogger applied server system, to provide a visual effect to the user with the basic information of the teaching device, the connection state, Sensor Type, Unit, Gain The sensor position information including the sensor temperature is displayed as a 2D map.

Here, the monitoring system is characterized in that the statistical information including the average value, the maximum value, the minimum value, and the standard deviation for each cycle of the data value measured by the LVDT is used to manage the history of the bridge structure.

In addition, the unmanned wireless bridge inspection system using a ubiquitous sensor network according to the present invention, may further include a CCD camera installed on one side of the chair device to transmit the image obtained by wirelessly photographing the displacement of the chair device. have.

On the other hand, as another means for achieving the above-described technical problem, the unmanned wireless bridge inspection system using the ubiquitous sensor network according to the present invention, to measure and monitor the displacement amount of the bridge device installed between the bridge and the bridge deck of the bridge structure A test system for checking a body, comprising: a laser light source for firing a laser; A USN (Ubiquitous Sensor Network) sensor which is fixed to one side of the teaching device and measures a displacement of the teaching device by receiving a light source emitted from the laser light source; A sensor interface module (SIM) for converting analog data measured by the USN sensor into digital data; A wireless data logger acquiring digitally converted data through the sensor interface module; A data processing unit implemented as middleware and filtering necessary information from data acquired from the wireless data logger; And a wireless communication module for transmitting the digital data filtered by the data processor to an external system.

Here, the laser light source, the USN sensor, the sensor interface module, the wireless data logger, the data processing unit, and the wireless communication module are integrated to form an intelligent smart sensor using a ubiquitous sensor network (USN), and the intelligent smart sensor is a It is characterized by measuring the displacement to self-determination of the occurrence of a dangerous situation and to notify the external system in real time.

Here, the laser light source is fixed to a cradle installed on the pier spaced a predetermined distance from the bridge device is characterized in that for firing the laser to the USN sensor.

According to the present invention, by using the LVDT or by using the USN sensor and the laser light source to measure the displacement of the bridge device installed between the bridge and the bridge deck unattended, it is possible to improve the work safety.

According to the present invention, it is possible to improve the convenience and objectivity of the inspection result by wirelessly transmitting the displacement of the measuring device measured using the LVDT or USN sensor and the laser light source and monitoring the inspection result easily.

According to the present invention, by measuring the displacement or movement of the bridge device as a bridge structure by intelligent smart sensors, it is possible to determine itself when a dangerous situation occurs, and to notify the manager and the bridge user in real time to prevent human injury and property from the dangerous situation.

According to the present invention, by using the state-of-the-art ubiquitous sensor network (USN) technology and fusion with CCTV images to check the bridge intelligently anytime, anywhere, it is possible to improve the efficiency of the bridge inspection platform.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. Also, the term "part" or the like, as described in the specification, means a unit for processing at least one function or operation, and may be implemented by hardware, software, or a combination of hardware and software.

As an embodiment of the present invention, there is provided an unmanned wireless bridge inspection system that can measure the displacement of the bridge device installed in the lower portion of the bridge using the ubiquitous sensor network (USN) of the advanced IT technology. Specifically, intelligent smart sensors measure the displacement or movement of bridge devices (or bridge supports), which are the bridge structures, to judge when a dangerous situation occurs, and to notify managers and bridge users in real time to prevent human injury and property from dangerous situations. An unmanned wireless bridge inspection system is provided.

FIG. 4 is a diagram schematically illustrating an unmanned wireless bridge inspection system using a ubiquitous sensor network according to an embodiment of the present invention.

Referring to FIG. 4, the unmanned wireless bridge inspection system 200 using the ubiquitous sensor network according to an embodiment of the present invention is implemented as an intelligent smart sensor, and the sensor unit measuring the displacement of the bridge bearing inside the intelligent smart sensor. (LVDT, laser, temperature, strain meter); An interface module for converting the measured data into digital; A wireless data logger for acquiring digital data; Middleware which filters necessary information from the acquired data and sends only necessary information to an administrator; And it may include a wireless communication module provided with a transmission and reception antenna.

The intelligent smart sensor 200 is disposed on the bridge structure on which the bridge device 130 is installed, the monitoring system 500, VMS notification 600, which is an external system by the wireless data transmitted from the intelligent smart sensor 200, The traffic light control system 700 may be managed wirelessly. In addition, the power supplied to the intelligent smart sensor 200 may be supplied using the solar cell module 400.

Here, the ubiquitous sensor network (USN) refers to a network configured to wirelessly collect information collected from various sensors.

Hereinafter, the unmanned wireless bridge inspection system 200 using the ubiquitous sensor network according to an embodiment of the present invention will be described in detail.

5A is a block diagram of an unmanned wireless bridge inspection system using LVDT according to an embodiment of the present invention.

5A, the unmanned wireless bridge inspection system 200 using the LVDT according to the embodiment of the present invention measures and monitors the displacement of the bridge device 130 installed between the bridge and the bridge deck of the bridge structure. As an inspection system, the LVDT 210 includes a sensor interface module (SIM) 220, a wireless data logger 230, a data processor 240, a wireless communication module 250, and a cradle 270. can do.

A linear variable differential transformer (LVDT) 210 is in contact with one side of the teaching device 130 and measures the displacement of the teaching device 130. A detailed description of the LVDT 210 is illustrated in FIG. 7A. And it will be described later with reference to Figure 7b.

The sensor interface module 220 converts analog data measured by the LVDT 210 into digital data. That is, the sensor interface module 220 may include an A / D converter for converting analog data measured from the LVDT 210 into digital data.

The wireless data logger 230 acquires digitally converted data through the sensor interface module 220.

The data processor 240 is implemented as middleware and filters necessary information from data acquired from the wireless data logger 230. Here, middleware refers to software that connects different types of hardware, protocols, communication environments, etc. in a distributed computing environment to enable smooth communication between an application and an environment in which the program operates. In other words, it is the software that bridges the gap between the various hardware, network protocols, applications, local area network environments, PC environments, and operating systems installed in an enterprise. In other words, it may be, but is not limited to, software that enables smooth communication between applications and operating environments in complex heterogeneous environments.

The wireless communication module 250 transmits the digital data filtered by the data processing unit 240, where the wireless communication module 250 is preferably a short range wireless communication module, and the short range wireless communication module is an example. For example, it may be selected from Zigbee, Bluetooth, and UWB (Ultra-wideband), but any case capable of wireless communication in a short distance is possible.

In addition, the unmanned wireless bridge inspection system 200 using the LVDT according to an embodiment of the present invention may be linked to an external system for wirelessly receiving digital data transmitted from the wireless communication module, respectively, such an external system is a monitoring system. 500, a Voice Messaging System (VMS) 600, or a traffic light control system 700.

The monitoring system 500 monitors the displacement of the chair apparatus according to the digital data transmitted from the wireless communication module. Specifically, the monitoring system 500 monitors the displacement of the teaching device 130 according to the digital data transmitted from the wireless communication module 250, the monitoring system 500 may be implemented as an AnyLogger applied server system. Sensor position information including a connection state, a sensor type, a unit, a gain, and a sensor temperature to provide a visual effect to the user together with the basic information of the chair apparatus 130. Can be displayed as a 2D map. In addition, the monitoring system 500 may provide statistical information including the average value, the maximum value, the minimum value, and the standard deviation of each data value measured by the LVDT 210 to manage history of the bridge structure.

The VMS 600 generates a voice message according to the digital data transmitted from the wireless communication module 250, and the traffic light control system 700 generates the voice message according to the digital data transmitted from the wireless communication module 250. The device 130 controls the traffic lights around the bridge.

In addition, the power supplied to the intelligent smart sensor 200 may be supplied using the solar cell module 400.

Accordingly, the unmanned wireless bridge inspection system 200 using the LVDT according to the embodiment of the present invention may include the LVDT 210, the sensor interface module 220, the wireless data logger 230, the data processor 240, and the wireless communication module ( 250 is integrated to form an intelligent smart sensor using a ubiquitous sensor network (USN), and the intelligent smart sensor 200 measures the displacement of the teaching device 130 to self-determine the occurrence of a dangerous situation and the external system ( 500, 600, 700 will be notified in real time. In addition, the unmanned wireless bridge inspection system 200 using the LVDT (210) in accordance with an embodiment of the present invention measures the displacement of the bridge device 130 of the bridge structure, the knitting device of the bridge device 130 and the occurrence of surrounding concrete cracks Can be measured.

On the other hand, in the case of security systems that are built for the purpose of crime prevention or disaster prevention, or automation systems that want to pursue the convenience of life by automatically or remotely controlling indoor electronic devices, they are installed indoors and outdoors to monitor the surroundings in real time. Camera is in use. Such a surveillance camera has an image capturing function and a transmission function, and photographs and transmits an image of a surrounding, and transmits the image transmitted from the surveillance camera to a predetermined designated display device for monitoring.

In this case, the surveillance camera device may include a CCD (Charge Coupled Device) camera as an image pickup device for converting an optical signal of the subject into an electrical signal from a lens that enlarges and transmits the light source of the subject.

5B is a diagram illustrating a configuration in which a CCD camera (CCTV) is coupled to an unmanned wireless bridge inspection system using a ubiquitous sensor network according to an embodiment of the present invention.

Referring to FIG. 5B, in an unmanned wireless bridge inspection system using a ubiquitous sensor network according to an embodiment of the present invention, a CCD camera (CCTV) 290 may be combined and fused with a CCTV image. That is, the unmanned wireless bridge inspection system using a ubiquitous sensor network according to an embodiment of the present invention, the CCD camera 290 is installed on one side of the bridge device to transmit the image obtained by wirelessly photographing the displacement of the bridge device By additionally including, it is possible to obtain and process an image of the defect of the teaching apparatus.

6A is a view for explaining the arrangement of the unmanned wireless bridge inspection system using the ubiquitous sensor network according to an embodiment of the present invention, Figure 6b is a view for explaining the operation principle of the LVDT for the inspection of the bridge.

As shown in FIG. 6A, the unmanned wireless bridge inspection system 200a, 200b, 200c according to an embodiment of the present invention is disposed in each of a plurality of bridge devices 130a, 130b, 130c disposed on the bridge 110. In addition, it may also be disposed in each of the plurality of bridge devices disposed on the plurality of bridges 110, respectively. In this case, the LVDT 210, the sensor interface module 220, the wireless data logger 230, the data processor 240, and the wireless communication module 250 are disposed in one of the teaching devices, and the remaining teaching devices are arranged in the teaching device. Only the LVDT 210, the sensor interface module 220, and the wireless communication module 250 except for the wireless data logger 230 and the data processor 240 may be disposed. That is, the wireless data logger 230 and the data processor 240 may be disposed in one of the teaching device, and may receive and process data transmitted by the wireless communication module 250 in a batch.

As shown in Figure 6b, the bridge structure is composed of a bridge 110, bridge top plate 120 and the bridge device 130, the unmanned wireless bridge inspection system 200 using LVDT according to an embodiment of the present invention The LVDT 210 may be used to measure the displacement of the bridge device 130 of the bridge structure or to measure the knitting of the bridge device or the occurrence of cracks in the surrounding concrete. Specifically, as shown by reference numeral A, when the LVDT 210 is installed in the cradle 270, and the chair device 130 moves, the LVDT 210 contracts so that the displacement of the chair device 130 is reduced. I can measure it. As shown by reference numeral B, one side of the LVDT 210 is fixed to the cradle 270 installed on the bridge spaced apart from the bridge device 130 by a certain distance, the other side of the LVDT 210 is the bridge In contact with the device 130 is measured when the displacement of the chair device 130 occurs.

On the other hand, a magnetic sensor using a magnetic principle is an element that converts magnetism into electricity, and a change in magnetic flux, that is, mutual inductance, in which mechanical displacement occurs between a primary coil and a secondary coil. As a transducer, a transducer belonging to this type is called LVDT (Linear Variable Differential Transformer).

7A and 7B are an external view and a circuit diagram of an LVDT according to an embodiment of the present invention, respectively.

As shown in FIGS. 7A and 7B, the LVDT sensor 210 is provided with one primary coil 212a and two secondary coils 212b and 212c in a symmetrical structure in a cylindrical housing body. The two secondary coils 212b and 212c are connected in series reverse polarity and are displaced by using a signal generated when the core 211 of the ferromagnetic material moves linearly between the passages of the coils 212a, 212b and 212c. Measurement, for example, displacement measurement of the X axis direction can be performed. Reference numeral 213 denotes a reference oscillator, and reference numeral 214 denotes an amplifier for amplifying the output value.

Specifically, the LVDT 210 refers to an electrical transducer type that measures a linear distance difference, and three solenoid coils 212a, 212b, and 212c are positioned around the tube. The middle coil 212a is the main one, and the other two are located 212b and 212c outside. At this time, the magnet-shaped core 211 moves along the center of the tube to inform the position value of the measurement target. Therefore, the LVDT 210 converting the mechanical displacement into an electrical signal has a change in magnetic flux induced from the primary coil 212a to the secondary coils 212b and 212c by the movement of a core or armature, that is, mutual inductance. As a transducer that changes the voltage, the electrical output is generated in proportion to the displacement of the movable core 211, which is mechanically and electrically separated. The position of the valve is controlled according to the amount of the output. Done.

8A and 8B are diagrams illustrating a sensor interface module and a wireless LVDT according to an embodiment of the present invention, respectively.

FIG. 8A illustrates an interior of a sensor interface module (SIM), which is a sensor interface module 220. The sensor interface module (SIM) includes various sensors used for civil measurement with a wireless data logger 230 or a wireless communication module 250. To connect. 8B illustrates a sensor board in which a wireless LVDT 210, which is a displacement meter used to measure strain, displacement, and the like, is connected through one connector of the sensor interface module 220 and includes an A / D converter through an opposite connector. Is connected to. That is, the sensor interface module 220 is used to convert the analog signal measured by the LVDT sensor 210 into a signal suitable for the A / D converter.

9 is a diagram illustrating a configuration of a wireless communication module according to an embodiment of the present invention, and FIG. 10 is a table illustrating a configuration and specifications of a wireless communication module according to an embodiment of the present invention.

As shown in FIG. 9, the wireless communication module 250 according to an embodiment of the present invention receives a digital signal transmitted from a sensor interface module 220 located in a teaching device, or is filtered by the digital processor 240. In order to receive a digital signal, it may include a lamp indicating each state, an input / output port, a USB expansion port, a console interface, an antenna, and the like. In addition, as shown in Figure 10, the wireless communication module 250 according to an embodiment of the present invention is a 10/100 Base-T Ethernet interface with an RJ45 connector, a maximum transmit power of + 18dBM, reception sensitivity of -88dBm The specification of the wireless communication module 250 shown in FIG. 10 is shown for illustrative purposes only and is not limited thereto.

On the other hand, Figure 11 is a block diagram of an unmanned wireless bridge inspection system using a USN sensor and a laser light source according to another embodiment of the present invention.

Referring to FIG. 11, the unmanned wireless bridge inspection system 300 using the USN sensor and the laser light source according to another embodiment of the present invention includes a USN sensor 310, a sensor interface module (SIM) 320, and a wireless data logger. 330, a data processor 340, a wireless communication module 330, a cradle 370, and a laser light source 380.

Compared to the above-described embodiment of the present invention shown in FIG. 5, the unmanned wireless bridge inspection system 300 using the USN sensor and the laser light source according to another embodiment of the present invention is a USN sensor (instead of the LVDT 210). 310 and the laser light source 380, except that the role of the cradle 370, the sensor interface module (SIM) 320, wireless data logger 330, data processing unit 340 and wireless communication The module 350 is substantially the same as that shown in FIG. 5, and thus a detailed description thereof will be omitted.

That is, in the unmanned wireless bridge inspection system 300 using the USN sensor and the laser light source according to another embodiment of the present invention, the USN attached to the bridge device 130 from the laser light source 380 installed in the holder 370 The laser is emitted to the sensor 310, thereby determining the displacement of the USN sensor 310 fixedly attached to the chair device 130.

The laser light source 380 is fixed to the cradle 370 installed on the bridge spaced apart from the bridge device 130 by a predetermined distance to emit a laser beam to the USN sensor 310.

The USN sensor 310 is fixed to one side of the teaching device 130, and receives the light emitted from the laser light source 380 to measure the displacement of the teaching device 130.

At this time, the laser light source 380, USN sensor 310, sensor interface module 320, wireless data logger 330, data processing unit 340, wireless communication module 350 is integrated to the ubiquitous sensor network ( USN) to form an intelligent smart sensor 300, the intelligent smart sensor 300 measures the displacement of the teaching device 130 to determine the occurrence of a dangerous situation to the external system (500, 600, 700) Real time notification In addition, the unmanned wireless bridge inspection system 300 using the USN sensor 310 and the laser light source 380 according to another embodiment of the present invention measures the displacement of the bridge device 130 of the bridge structure, or knitting machine of the bridge device And the occurrence of surrounding concrete cracks.

12 is a view for explaining the principle of operation of the USN sensor and the laser light source for checking the inspection according to another embodiment of the present invention.

As shown in FIG. 12, the laser light source 380 and the USN sensor 310 are used to measure the displacement of the bridge device 130 installed between the bridge 110 and the bridge deck 120 of the bridge structure. First, the USN sensor 310 is attached to one side of the device 130. Then, as shown by reference numeral B, a cradle 370 is installed near the chair apparatus 130, and the USN sensor attached to the chair apparatus 130 from the laser light source 380 installed on the cradle 370. The laser is fired at 310. Accordingly, it is possible to determine the displacement of the USN sensor 310 attached to the chair device 130.

13A to 13C are diagrams illustrating a home screen, a setting screen, and a trigger screen implemented in a server system to which an logger is applied according to an embodiment of the present invention.

The above-described wireless data logger 230 may be implemented by a program in, for example, a server system to which any logger is applied. FIG. 13A is a home screen 1210 and FIG. 13B is a setting screen ( 1220, and FIG. 13C respectively show a trigger screen 1230.

As shown in FIG. 13A, when the Home button 1211 is selected, the server system displays detailed information of the connected sensor, eg, LVDT. Specifically, in order to provide a visual effect to the user together with the basic information of the overall teaching device, the position information of the sensor such as connection status, sensor type, unit, gain, sensor temperature, etc. is displayed in a 2D map. It is displayed on (Map). Therefore, the home screen 1210 can easily view the connection status of the wireless sensor in real time, and can easily view the operating state of the sensor at the time of monitoring.

In addition, as shown in FIG. 13B, when the setting button 1221 is selected in the setting screen 1220, the number of sensors, a sensor connection state, a sensor type, a data storage function, a unit designated value, etc. The user can easily check and input the information.

In addition, FIG. 13C illustrates that the Trigger button 1231 is selected on the Trigger screen 1230. In this case, the Trigger tool visually displays a digital and bar data viewer function, a real-time TY graph, and an analysis graph. It is a function that can be easily seen, and it can be used to manage the history of the target bridge by providing statistical information such as the average value, the maximum value, the minimum value, and the standard deviation of the LVDT data value per cycle.

On the other hand, Figure 14 is a diagram illustrating an indoor experiment for the implementation of the unmanned wireless bridge inspection system according to an embodiment of the present invention.

As shown in FIG. 14, the applicability of the wireless measurement system is verified by comparing and examining the wired measurement equipment and the wireless measurement equipment, and the displacement of the teaching apparatus is measured using the wireless measurement system. FIG. 14 is an indoor experimental photograph. After fixing the LVDT 210 on both sides of the model teaching apparatus, the displacement is measured according to the movement of the teaching apparatus, and the monitoring system is performed via the wireless data logger 230 and the wireless communication module 250. Measurement data can be monitored at 500).

15A and 15B are diagrams illustrating a data analysis graph and a trigger analysis graph digitally converted through a sensor interface module connected to an LVDT according to an embodiment of the present invention, respectively.

Referring back to FIG. 5, the data digitally converted via the sensor interface module 220 connected to the LVDT 210 may be transferred to the external system via the wireless communication module 250, for example, the main computer 500 for monitoring. Is sent to. For example, 50 data per second were measured and analyzed. FIG. 15A is a data analysis graph of an Excel file format measured for LVDT 100 mm and LVDT 50 mm, respectively, and shows a displacement amount according to time. Also, the screen 1400 illustrated in FIG. 15B is a trigger analysis graph. 1410 indicates that monitoring starts and ends.

On the other hand, in the unmanned wireless bridge inspection system according to an embodiment of the present invention described above, using the LVDT or USN sensor to measure the displacement of the bridge device of the bridge structure, or to measure the knitting machine and the surrounding concrete crack occurrence of the bridge device Although described, the temperature measuring device, the strain sensor, the location based system (LBS), the frequency and the imaging device may be checked.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

1A and 1B illustrate a typical bridge structure in which a bridge arrangement is installed between a bridge and a bridge deck.

2 is a view showing a system of a measuring instrument for measurement according to the prior art.

Figure 3 is a cross-sectional view showing a disc (disc) type device with a fiber sensor according to the prior art.

FIG. 4 is a diagram schematically illustrating an unmanned wireless bridge inspection system using a ubiquitous sensor network according to an embodiment of the present invention.

5A is a block diagram of an unmanned wireless bridge inspection system using LVDT according to an embodiment of the present invention.

5B is a diagram illustrating a configuration in which a CCD camera (CCTV) is coupled to an unmanned wireless bridge inspection system using a ubiquitous sensor network according to an embodiment of the present invention.

FIG. 6A is a view for explaining an arrangement of an unmanned wireless bridge inspection system using a ubiquitous sensor network according to an embodiment of the present invention, and FIG. 6B is a view for explaining an operation principle of an LVDT for checking a bridge.

7A and 7B are an external view and a circuit diagram of an LVDT according to an embodiment of the present invention, respectively.

8A and 8B are diagrams illustrating a sensor interface module and a wireless LVDT, respectively, according to an embodiment of the present invention.

9 is a diagram illustrating a configuration of a wireless communication module according to an embodiment of the present invention.

10 is a table showing the configuration and specifications of a wireless communication module according to an embodiment of the present invention.

11 is a block diagram of an unmanned wireless bridge inspection system using a USN sensor and a laser light source according to another embodiment of the present invention.

12 is a view for explaining the principle of operation of the USN sensor and the laser light source for checking the inspection according to another embodiment of the present invention.

13A to 13C are diagrams illustrating a home screen, a setting screen, and a trigger screen respectively implemented in a server system to which an logger is applied according to an embodiment of the present invention.

14 is a diagram illustrating an indoor experiment for the implementation of the unmanned wireless bridge inspection system according to an embodiment of the present invention.

15A and 15B are diagrams illustrating a data analysis graph and a trigger analysis graph digitally converted through a sensor interface module connected to an LVDT according to an embodiment of the present invention, respectively.

<Brief Description of Drawings>

110: bridge 120: bridge deck

130: check device 200: first check inspection system

210: LVDT 220: sensor interface module (SIM)

230: wireless data logger 240: data processing unit (middleware)

250: wireless communication module 270: holder

290: CCD camera 300: the second point inspection system

310: USN sensor 380: laser light source

400: solar cell module 500: monitoring system

600: Voice Messaging System (VMS) 700: Traffic Light Control System

Claims (12)

delete delete delete delete delete delete delete delete In the bridge inspection system that measures and monitors the displacement of the bridge device installed between the bridge and the bridge deck of the bridge structure, A laser light source for firing a laser; A USN (Ubiquitous Sensor Network) sensor which is fixed to one side of the teaching device and measures a displacement of the teaching device by receiving a light source emitted from the laser light source; A sensor interface module (SIM) for converting analog data measured by the USN sensor into digital data; A wireless data logger acquiring digitally converted data through the sensor interface module; A data processing unit implemented as middleware and filtering necessary information from data acquired from the wireless data logger; And It includes a wireless communication module for transmitting the digital data filtered by the data processing unit to an external system, The laser light source is fixed to a cradle installed on the bridge spaced apart from the bridge device is fixed to the USN sensor unmanned wireless bridge inspection system using a ubiquitous sensor network, characterized in that for firing. 10. The method of claim 9, The laser light source, the USN sensor, the sensor interface module, the wireless data logger, the data processing unit, and the wireless communication module are integrated to form an intelligent smart sensor using a ubiquitous sensor network (USN), and the intelligent smart sensor controls the displacement of the teaching device. Self-determining the occurrence of a risk situation by measuring the unmanned wireless chair check system using a ubiquitous sensor network characterized in that the real-time notification to the external system. delete The method of claim 9, wherein the external system, A monitoring system for monitoring displacement of the teaching device in accordance with the digital data transmitted from the wireless communication module; A Voice Messaging System (VMS) for generating a voice message according to the digital data transmitted from the wireless communication module; And Traffic light control system for generating a control signal for controlling the traffic light around the bridge is installed in accordance with the digital data transmitted from the wireless communication module Unmanned wireless bridge inspection system using a ubiquitous sensor network comprising a.

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