CN203217714U - Multi-parameter bridge safety monitoring and early-warning system based on wireless sensing network - Google Patents
Multi-parameter bridge safety monitoring and early-warning system based on wireless sensing network Download PDFInfo
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- CN203217714U CN203217714U CN 201320112952 CN201320112952U CN203217714U CN 203217714 U CN203217714 U CN 203217714U CN 201320112952 CN201320112952 CN 201320112952 CN 201320112952 U CN201320112952 U CN 201320112952U CN 203217714 U CN203217714 U CN 203217714U
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Abstract
The utility model discloses a multi-parameter bridge safety monitoring and early-warning system based on a wireless sensing network, which comprises local wireless terminal nodes, a local dual-network host node and data center devices. The local wireless terminal nodes comprise an acceleration inclination-angle terminal node, a steel-bar stressometer terminal node and a displacement sensor terminal node; the local dual-network host node is connected with a wind speed and direction meter, a tipping-bucket type pluviometer and a humiture meter; and the data center devices comprise a server, a computer network device and a data reception device. Physical properties monitored by the system comprise an inclination angle, dynamic properties, acceleration change, surface displacement and steel-bar stress of a bridge, as well as real-time wind speed and direction, rainfall, humidity and the like of the space where the bridge is placed; bridge safety can be effectively ensured via monitoring of the physical properties in cooperation with monitoring software of a monitor end; and early warning against hidden collapse ricks is given in advance.
Description
Technical field
The utility model relates to bridge security monitoring field, relates in particular to a kind of multiparameter bridge security monitor and early warning system based on wireless sense network.
Background technology
Extreme climate frequently took place in recent years, had caused a lot of bridge cave-in accidents, had caused huge people's property loss.Bridge is carried out periodic maintenance and maintenance, its health status is monitored and estimated, it is significant grasping its health status.Traditional bridge maintenance management mode belongs to a kind of corrective maintenance mode after disease appears in bridge mostly, by the bridge maintenance personnel often and make regular check on, find disease or damage, again please specialty detect unit and carry out special examined, according to detecting evaluation result, it is carried out maintenance and reinforcement.This maintenance strategy is passive, and the detection method that adopts mainly is by artificial visually examine's inspection or by portable instrument bridge to be detected, there are many limitation, mainly show: a) real-time is poor, can not reach after accident takes place, find out bridge structural state rapidly, in time the purpose of serving for the bridge management decision; Need a large amount of human and material resources and financial resources when b) detecting, to detect repetitive operation more at every turn, and personnel, equipment are difficult for arriving, and some significant points and inside configuration damage are difficult for being found by visual examination; C) influence of examined personnel's knowledge experience technical ability is very big, and the subjectivity of detection is strong, and many detection indexs are difficult to quantize; D) influence normal traffic operation, carry out especially that bridge is quiet, during dynamic test, need interim close traffic.Traditional detection method and detection means are because its limitation can not adapt to the demand for development of extensive bridge health detection evaluation, and bridge is again the transport hub, ensures that its safe operation has very important significance.Therefore need centering foot bridge health monitoring evaluation system badly and study, develop the modern maintenance management pattern of adaptation, can grasp the novel bridge detection method of bridge structure operation state and reflex action in real time, comprehensively.The detection of bridge structure, monitoring also just become the bridge structure safe maintenance and ensure the normal major technique means of using.
Traditional bridge health monitoring is the data acquisition system (DAS) of forming as basic transmission medium with cable or electric wire.Solution commonly used at present is on-the-spot in monitoring, sensor is arranged in the key position that needs the monitoring bridge, sensor adopts star-like connection, the signal that each sensor is collected is sent to the centric acquisition station with separate cable, by the centric acquisition station signal of all connections is focused on and to send to host computer, carry out real-time data acquisition.Bridge structure is generally all very huge, needs a lot of sensors, the working environment complexity, and corresponding monitoring point disperses, and there is very big problem in this traditional wire signal transmission mode:
1. circuit is laid complexity, and wiring is loaded down with trivial details, and the cost height is installed, and the cable in later stage safeguards that the time and efforts that consumes is huge, and big limitation is arranged in the application;
2. some monitoring transmission range is too far away, can cause the distortion of data to a lot of sensor feeble signals in the bridge monitoring;
3. picking rate is slow, data-interface and system combination ability;
4. influence normal traffic circulation, regularly detect if bridge is carried out loading test etc., need close traffic.
This traditional centralized monitoring system of serial influences reliability and the dirigibility of processing speed and the system of system to a great extent.
Summary of the invention
For solving above-mentioned middle problem and the defective that exists, the utility model provides a kind of multiparameter bridge security monitor and early warning system based on wireless sense network.Native system thought is the member radio sensing network, make the sensor of traditional wired connection break away from the restriction of cable, increased the degree of flexibility that sensor is deleted, improved the reliability of system, be unlikely to because the operation irregularity of other sensor causes the collapse of total system, Android system mobile phone client-side program and supporting server software have been designed simultaneously, make the bridge security monitor and early warning system not only realize the wireless penetration of sensor, more realized checking whenever and wherever possible, broken away from the restriction of internet computer.Described technical scheme is as follows:
A kind of multiparameter bridge security monitor and early warning system based on wireless sense network comprises: local wireless terminal node, local two host's machine nodes and data center apparatus; Be connected by the Zigbee wireless networking between described local wireless terminal node and the local two host's machine nodes;
Described local wireless terminal node comprises acceleration inclination angle terminal node, reinforcement stresses meter terminal node and displacement transducer terminal node;
The two host's machine nodes in described this locality are connected with wind instrument, tipping-bucket rain-gauge and Hygrothermograph;
Described data center apparatus comprises server, computer network facility, data receiver and is provided with the cell-phone customer terminal of Android system.
The beneficial effect of the technical scheme that the utility model provides is:
Be target with exploitation based on the multiparameter bridge security monitor and early warning system of sensing net, carry out Study on Technology such as bridge variation under bridge low-and high-frequency vibrant characteristic, bridge internal fissure growing state, reinforcement stresses, big wind speed, the rainfall situation at the stability of bridge, and exploitation has the holonomic system of terminal node, host node and server software based on this.The physical characteristics of monitoring mainly contains wind speed and direction real-time distribution situation, rainfall amount, humiture of acceleration change, surface displacement, reinforcement stresses and the bridge locus of living in of the inclination angle of bridge self and dynamic perfromance, bridge etc.Monitoring by above-mentioned physical characteristics cooperates the server end monitoring of software can effectively guarantee the safety of bridge, and the bridge with the potential risk of caving in provided early warning in advance, especially under extreme astronomical phenomena situation, the safe condition of real-time judge monitoring bridge, before having an accident, give warning in advance, reduce people's property loss.This project has excellent popularization prospect, economic results in society and practical value.
Description of drawings
Fig. 1 is based on the multiparameter bridge security monitor and early warning system structural representation of wireless sense network;
Fig. 2 Zigbee wireless networking structure connection diagram;
Fig. 3 displacement transducer synchronous collection method processing flow chart;
Fig. 4 is data center's station equipment structural drawing;
Fig. 5 is the station equipment system framework figure of data center.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing the utility model embodiment is described in further detail:
As shown in Figure 1, showed system architecture of the present utility model, this system comprises: local wireless terminal node, local two host's machine nodes and data center apparatus; Be connected by the networking of Zigbee local wireless between described local wireless terminal node and the local two host's machine nodes;
Described local wireless terminal node comprises acceleration inclination angle terminal node, reinforcement stresses meter terminal node and displacement transducer terminal node;
The two host's machine nodes in described this locality are connected with wind instrument, tipping-bucket rain-gauge and Hygrothermograph;
Described data center apparatus comprises server, computer network facility, data receiver and is provided with the cell-phone customer terminal of Android system.
Above-mentioned local wireless terminal node comprises acceleration inclination angle terminal node, reinforcement stresses meter terminal node and three types of displacement transducer terminal nodes (also can add other nodes as required).Described acceleration inclination angle terminal node is connected with twin shaft oscillatory acceleration sensor and the double-shaft tilt angle sensor of real-time measurement bridge oscillatory acceleration and inclination angle situation of change; Reinforcement stresses meter terminal node is connected with type vibration wire reinforcement stresses meter, amplifies the signal of reinforcement stresses meter by the multi-stage bandpass filter amplifier, and obtains frequency values; The displacement transducer terminal node is connected with the stay-supported displacement transducer, is driven by high precision high stability degree constant current source.
Adopt the Zigbee wireless self-networking to be connected between local wireless terminal node and the host node, terminal node all is configured to route pattern, host node is configured to center mode, the transmission between the network that terminal node constitutes of the data of each terminal node finally all is pooled to host node, by the GPRS access device on the host node data is sent on the data center server again.The central station data receive by GPRS/SMS note and internet data bag dual mode, and central station is formed by computer server and support equipment, computer network environment, data receiver and by network special line and note reception transmitting apparatus that fixing IP inserts.A characteristic of present embodiment is the mobile phone client program of having developed based on the Android system, can allow managerial personnel to check the safe condition of each bridge whenever and wherever possible, has avoided traditional computing machine that must adopt to be connected into the inconvenience that checking of interconnected network mode brought.
The networking plan that present embodiment provides:
Because the span of some bridge reaches tens kilometers, therefore rational networking mode has determined the reliability and stability of system.Because the singularity of bridge, its monitored area is bar-shape, it is planar being different from common monitored area, although it is comparatively simple to adopt wired networking mode to implement, but its cost height, and lay very difficulty, therefore adopt the wireless mode networking usually, traditional wireless data transmission module then is not with ICP/IP protocol stack function, therefore the communication distance farthest of network depends on maximum communication power and the transmission range of wireless data transmission module itself, is subject to wireless control, and power can't further promote, in restriction and the 500mW, so transmission range is in the 1-2 kilometer.If adopt the Zigbee mode then different, Zigbee inside carries protocol stack, can carry out the transmission of data between any two wireless module, and module can be configured to route pattern, center mode, node mode arbitrarily.Under route pattern, can transmit the information of other modules.Therefore adopt the wireless network (as shown in Figure 2) of Zigbee wireless module realization, can possess the ability of infinity communication distance in theory, be not subject to the restriction of module self communication distance.
Between each terminal node, adopt the Zigbee mode to form network between terminal node and the host node, finish the collection of local data, the Zigbee wireless module comprises Zigbee routing node 1, Zigbee routing node 2, Zigbee routing node 3, and above-mentioned routing node sends to data center with the GPRS communication module of data by host node with data by the Zigbee Centroid that connects.This mode is suitable for a plurality of monitoring points at a distance of distant situation, and networking need not backguy, relatively flexibly, conveniently.
The terminal node design of above-mentioned acceleration inclination angle
(1) sensor chooses
What native system adopted is the twin-axis accelerometer of ADI company.ADXL203 typical case measurement range is at ± 1.7g, and this accelerometer both can have been measured and static also can measure dynamic acceleration, can bear the 3500g limit acceleration.Its pull-down current is less than 700 μ A, and sensitivity reaches 1000mV/g.In 40 ° C to 125 ° C temperature range of this accelerometer Zai –, have ± 0.3% moisture sensitivity; The zero migration precision of ± 25mg; Under the bandwidth less than 60Hz, has solution less than the solution (0.06 ° of inclination) of 1mg and the stability that is better than 0.1mg/ ° of C.
(2) signal amplifies and the change-over circuit design
Acceleration transducer output two-way voltage analog signal, and simulating signal is the signal of 2.5V direct current biasing of having superposeed, and therefore at first needs to move and amplifying circuit through over level, is ambipolar voltage signal with Signal Regulation.In order to guarantee X, the strict synchronized sampling of Y twin shaft signal, and the accuracy in sampling period adopt the mode of analog switch switching obviously infeasible.Intend adopting the analog to digital converter AD7714 of two high precision 24 bit resolutions, use its synchronizing function, the acceleration signal of the X-axis of sampling simultaneously and Y-axis.AD7714 is that a kind of high resolution 24 that U.S. AD company releases is modulus switching device.Because AD7714 has adopted the sigma-delta switch technology to make it have low noise less than 150nVrms, be applicable to that the AFE (analog front end) of wide dynamic range, low frequency signal is measured.Device can be configured to 3 complete difference inputs or 5 accurate difference inputs, adopts 3V or 5V power supply can realize nearly signal condition and the conversion of 5 passages easily, and its maximum data output speed is 11Khz.
AD7714 is a complete AFE (analog front end) that is used for the low frequency measurement application scenario, its 3 line serial line interfaces and SPI, QSPI, MICROWEIR compatibility.Can make configuration to gain setting, signal polarity and channel selecting by software.The principal feature of its AD7714 is as follows:
The highlyest realize 24 no error codes outputs, guarantee 0.0015% nonlinearity simultaneously;
Have the front-end gain programmable amplifier, yield value is 1～128, includes low-pass filter able to programme and read-write system calibration coefficient;
The input of 5 passages is arranged, can adopt the input of 3 tunnel difference or 5 tunnel accurate inputs as required;
Low noise (＜150nV rms);
Low-power consumption, typical electrical flow valuve are that 226 μ A(battery saving modes only are 4 μ A);
Adopt single 5V power supply (AD7714-5) or single 3V power supply (AD7714-3) mode.Adopt the Zigbee mode to form network between terminal node and the host node, finish the collection of local data, the GPRS communication module via host node sends to data center with data again.
The design of reinforcement stresses meter terminal node
(1) signal exciting circuit design
Because reinforcement stresses is counted vibrating string type sensor, when vibrating string type sensor changes at measured physical quantity, its intrinsic frequency will be changed, if have external source, then will cause the concussion of vibratory string, the concussion of vibratory string will be cut the magnetic line of force that internal fixation magnet forms, thereby generate faint voltage signal, when removing under the driving source situation, this induced potential signal is decayed gradually until being zero.The appropriate design of driving source concerns the life-span of vibrating wire sensor and the signal to noise ratio (S/N ratio) of induced signal, and driving voltage is too big, and the actuation duration is oversize, will shorten the life-span of vibrating wire sensor greatly; Driving voltage too a little less than, the actuation duration is too short, the voltage signal of then inducting is very faint, has brought difficulty for the design of back level signal amplifying and conditioning circuit.It is about 30V that present embodiment is chosen best driving voltage.Adopt the DC-DC converter of high frequency 2.2MHz switching frequency to realize that low pressure is to the lifting of high pressure.
(2) signal amplification circuit filter design
The induced potential signal amplitude of vibrating wire sensor output is little, and therefore decay fast needs design bandpass filtering amplifying circuit, rationally suppresses industrial frequency noise, neighbourhood noise and DC-DC switching frequency noise.Intend adopting differential mode to insert the induced potential signal, the instrumentation amplifier is finished pre-amplification as the first order and is handled, and bandpass filtering amplifies step by step afterwards, and designs saturated judging circuit, chooses best magnification automatically.Shaping obtains square-wave signal to voltage signal after the amplification through high speed voltage comparator, input Cortex-M3 controller, and its inner dominant frequency is 72MHz, can reach the frequency detection accuracy requirement through calculating.
The design of displacement transducer terminal node
(1) constant current source driving circuit design
Displacement transducer mainly is the slit developmental state that detects between the bridge internal link, and this project intends adopting the stay-supported displacement transducer, uses four-wire system Kelvin connected mode, can eliminate the influence of long cable direct impedance.Four-wire system Kelvin's connected mode need design high-precision constant-current source circuit, present embodiment uses high precision reference source+High-precision O P amplifier+impact damper+precision resistance to constitute the constant-current source circuit of negative feedback mode, this circuit is being realized than the multiproject design, constant-current accuracy can arrive 5ppm/ ℃, can satisfy the demand of this project.
(2) signal amplifies and the analog to digital conversion circuit design
High precise current source obtains voltage signal at displacement transducer, this voltage signal is differential mode, adopt common operational amplifier inevitably because common-mode rejection ratio is not high enough, bring dc error, intend adopting high precision difference instrument amplifier to amplify this voltage signal, be converted to the unipolarity voltage signal simultaneously, send into back level ADC change-over circuit.The ADC of 12 bit resolutions that plan use controller inside carries in the present embodiment finishes high-precision ADC conversion.Because displacement signal is slow converted quantity, therefore adopt the ADC of 12 bit resolutions that the over-sampling mode carries controller to rise to resolution more than 16, this method has also been passed through the checking of engineering project, and effect is remarkable.
The time synchronized algorithm design of wireless senser
In wireless sensor network, the position that event takes place or the node location of Information Monitoring are the important informations in the sensor node supervisory messages, do not have the detect-message of positional information often bold and unconstrained meaningless.Therefore, effectively locate most important to node.The design of sensor network location algorithm will consider that channel circumstance and sensor node its other resources etc. are all multifactor.A kind of good location algorithm possesses following 4 conditions: (1) algorithm must have robustness preferably, can position effectively; (2) in view of the resource-constrained on the sensor node, the algorithm expense must be as far as possible little; (3) algorithm should not increase cost and the complexity of node; (4) algorithm is distributed, can effectively locate in the sensor network of different scales.
PIR time partition method:
The synchronous collection method processing flow chart as shown in Figure 3.When synchronous collection Preset Time then, gather beginning synchronously, gateway is noted the physical time (Physicaltime) that beginning is gathered in time conduct this moment synchronously, each node initializing zero clearing local zone time (Initializetime) also stabs (Relativetime) with it as relative time, begins data acquisition this moment and periodically is uploaded to gateway by time division multiple access (TDMA) (TDMA) communication mode.Data acquisition triggers by interrupt mode and obtains and record, before node sends packet, squeezes into relative time and stab and this packet sequence number in this transmission packet.This physical time, the local zone time initialization also obtains the PIR time partition method of relative time, makes time synchronized and data transmission efficient stable in gatherer process, obtains for sampled point temporal information reliably to lay the first stone.
Two host's machine design of node
(1) sensor
Two host's machine nodes are connected with wind instrument, tipping-bucket rain-gauge and Temperature Humidity Sensor etc.Wind instrument is in order to the wind speed of real-time grasp bridge present position, and information such as the oscillatory acceleration that wind direction measures according to terminal node, obliquity sensor can be set up the relationship model between wind speed and direction and the bridge dynamic perfromance.Tipping-bucket rain-gauge then can obtain the hyetograph of bridge present position.
(2) two netting indexs are according to link design
One on two nets of present embodiment are the local wireless network based on Zigbee, a long-range access network that is based on GPRS.All defined protocol format for each packet in the system, added 16 CRC check simultaneously, data communication quality and reliability are provided.The Zigbee module of host node works in the Centroid pattern, therefore the eigenwert of Local wireless network, network ID number then depend on this Centroid, the transceiver that not only serves as data of terminal node, the effect of also serving as route simultaneously, the packet of forwarding other-end node.The GPRS module inserts the data center server with fixed ip address, realizes the data interaction with data center.
Data center builds at the station
(1) central station hardware device
As shown in Figure 4, the central station data receive by GPRS/SMS note and internet Internet packet dual mode, and central station is by computer system server and support equipment (router etc.) computer network environment (monitor terminal), data receiver (GPRS/SMS access device) and have the network special line of fixedly IP access and note reception transmitting apparatus (SMS alarm notice, administrative center) to form.
The central station server is nucleus equipment, and server need guarantee the stability and the high-performance that run without interruption, need be equipped with the outage of UPS prevention server, and power-off restarting need be set, and needs to be equipped with standby server in case of necessity.Simultaneously, because server is directly linked the internet, for maximum guarantees security of operation, need good fire wall and antivirus software support.For guaranteeing the smooth and easy of access to netwoks, the server network bandwidth need be more than 2M.
Note receives transmitting apparatus and is used for the instant early warning information of issue, also needs to run without interruption, and for this reason, need select the performance good quality production for use, and irregularly supplement operation with money.
Central station software
Central station software requirement Microsoft Windows Server operating system, Microsoft SQL Server database, Internet information service (IIS), note receive transmitting apparatus related software, server firewall and antivirus software and system moves " the data receiving software " that needs.
The software function brief introduction:
Data receive
Whether software has new data by the timer cycle detection, if there is new data to arrive, carries out read operation immediately, then data is resolved, and comprises source and the kind (data comprise user command data and two kinds of real-time Monitoring Data) of judgment data.
Data are handled
After obtaining data class, then need carry out the data layout check according to the kind of data.If upcheck, user command is carried out command conversion work, is converted to the form of far-end monitoring equipment regulation, sends to the far-end monitoring equipment at last.In real time Monitoring Data is carried out the break-in operation of data, and the data of ad-hoc location are converted to corresponding monitoring point period, is converted to the data value of each monitoring index, finally is decomposed into the minimum data unit that can put in storage.If can't pass check, data will be regarded as wrong information.User command will directly abandon, and be recorded in the software work daily record for future referencely then, and return prompting message of user.Monitoring Data also will abandon in real time, and be recorded in the software work daily record for future reference together with error message.
The telemetry storage
To carry out the database storage by the real-time Monitoring Data of check, data are put in storage according to the monitoring point period that processing obtains.
The telemetry analysis and early warning
During correct telemetry warehouse-in, will carry out data analysis work synchronously, and analyze data and whether reach the various conditions that the user sets, will start corresponding early warning work if condition satisfies, early warning comprises three kinds of webpage message, SMS and long-range sound and light alarms.
The note cat is inserted
Automatically carry out the retrieval of note cat access interface during software startup, retrieve successfully and will show current port numbers, and start short message service.If the retrieval failure can not start short message service, need the user to set up on their own.Software provides manual note to send, and can carry out the test job of note cat.
Software arranges
Software provides the setting of database, comprises database address and entry password, and the user can be arranged voluntarily.Provide the starting up that function is set simultaneously, the data of effectively avoiding server to restart may causing receive interrupts.In addition, provide to be hidden into the system tray function, allow running software occupy minimizing of computer desktop.
Daily record of work
Each step operation that software carries out all is recorded in the daily record frame in the interface, and for future reference in the TXT file according to different date storage synchronously.
(2) system framework
As shown in Figure 5, total system adopts four coating systems to constitute, and comprising: be responsible for to data the networking issue, show, interactive interface between user and the system and the presentation layer of process user diverse network request are provided; All real-time detection raw data, the basic information data of monitoring point, system user data, system environments data are carried out the data Layer of data storage; The data that communication layers is uploaded are handled, and the interface format in accordance with regulations of the data after will handling is delivered to the logical layer of data Layer; Obtain the raw data that the remote monitoring instrument observes and predicts, and issue the communication layers that the needs that transmit from logical layer are issued to the order of remote monitoring instrument.
Presentation layer
Presentation layer be responsible for to data the networking issue, show, interactive interface between user and the system and the diverse network request of process user are provided.Comprise information issue subsystem, statistical study subsystem, data administration subsystem and system management subsystem.System adopts the information issue of configure publication platform networkization, user's all operations all carries out at the webpage front end, and the user only needs one to be connected into PC in the internet or the Microsoft Windows Server of palm machine system or Microsoft SQL Server and to get final product.System disposes simple, and is easy to use, friendly.
Data Layer
The main effect of data Layer is that all real-time monitoring information data, monitoring point basic information data, system's operation information data, system environments data are carried out the database storage.That database adopts at present is Microsoft SQL Server2008, can be transplanted to other Database Systems.
Logical layer
Logical layer is the core of native system, main effect is that the data that communication layers is uploaded are handled, and the interface format in accordance with regulations of the data after will handling delivers to data Layer, specifically comprises the Data Format Transform module, data resolution module and data analysis early warning module etc.
Communication layers
The main task of communication layers is to obtain the raw data that remote monitoring point monitoring instrument is observed and predicted, and issues the order that the needs that transmit from logical layer are issued to the remote monitoring instrument.
In the design of total system, loose standard interface pattern is adopted in the design of communication layers, and standard interface comprises monitoring equipment parameter interactive interface, monitoring equipment data access interface and GPRS communication early warning service interface; The interface of each module and the interface of logical layer are consistent, and keep loose standard interface with monitoring instrument.When needs increase monitoring sensor newly, only need add in the back successively according to original order, and carry out corresponding definition at webpage and can directly put into system's use.
The system power supply design
Present embodiment adopts the super low-power consumption technical design to finish, and except the GPRS module was uninterrupted power supply continuously, other functional modules all had independently power remove, sleep mode.Therefore the whole stand-by power consumption of system is extremely low is 200mW (quiescent dissipation that comprises GPRS communication module, host node).Other functional modules in the system are all the discontinuous operation pattern, and the collection of time opening functional module obtains the physical parameter of every sensor, reenter dormant state after sending to data center server.Therefore the power consumption of whole system is extremely low, so adopted the solar panel of 60 watts of power to be equipped with continuously not power down high-efficiency solar charger the lead-acid accumulator of 12V/100AH is finished Charge Management, under no any illumination condition, native system still can be about 300 days in continuous working 12 * 100/0.15=8000 hour, certainly consider the self-discharge characteristics of lead-acid accumulator, running time was roughly about 3 months.
The above is preferred embodiment of the present utility model only, is not limited to the utility model, and is all within spirit of the present utility model and principle, any modification of doing, is equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (2)
1. based on the multiparameter bridge security monitor and early warning system of wireless sense network, it is characterized in that described system comprises: local wireless terminal node, local two host's machine nodes and data center apparatus; Be connected by the Zigbee wireless networking between described local wireless terminal node and the local two host's machine nodes;
Described local wireless terminal node comprises acceleration inclination angle terminal node, reinforcement stresses meter terminal node and displacement transducer terminal node;
The two host's machine nodes in described this locality are connected with wind instrument, tipping-bucket rain-gauge and Hygrothermograph;
Described data center apparatus comprises server, computer network facility, data receiver and is provided with the cell-phone customer terminal of Android system.
2. the multiparameter bridge security monitor and early warning system based on wireless sense network according to claim 1 is characterized in that,
Described acceleration inclination angle terminal node is connected with twin shaft oscillatory acceleration sensor and the double-shaft tilt angle sensor of real-time measurement bridge oscillatory acceleration and inclination angle situation of change;
Described reinforcement stresses meter terminal node is connected with type vibration wire reinforcement stresses meter;
Described displacement transducer terminal node is connected with the stay-supported displacement transducer.
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| CN 201320112952 CN203217714U (en) | 2013-03-13 | 2013-03-13 | Multi-parameter bridge safety monitoring and early-warning system based on wireless sensing network |
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| CN 201320112952 CN203217714U (en) | 2013-03-13 | 2013-03-13 | Multi-parameter bridge safety monitoring and early-warning system based on wireless sensing network |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607464A (en) * | 2013-11-26 | 2014-02-26 | 北京工业大学 | Wireless safety monitor system of support structure based on ZigBee and GPRS |
| CN107421481A (en) * | 2017-07-04 | 2017-12-01 | 成都理工大学 | A kind of three-dimension monitor early warning multipoint displacement meter for being used to measure rock mass dilatancy |
| CN108540560A (en) * | 2018-04-16 | 2018-09-14 | 宁波宏飞信息科技有限公司 | A kind of long-range bridge maintenance control system and method |
| CN113176055A (en) * | 2021-04-22 | 2021-07-27 | 中煤科工集团重庆研究院有限公司 | Long-endurance power supply device for concrete stress-strain detection |
-
2013
- 2013-03-13 CN CN 201320112952 patent/CN203217714U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607464A (en) * | 2013-11-26 | 2014-02-26 | 北京工业大学 | Wireless safety monitor system of support structure based on ZigBee and GPRS |
| CN107421481A (en) * | 2017-07-04 | 2017-12-01 | 成都理工大学 | A kind of three-dimension monitor early warning multipoint displacement meter for being used to measure rock mass dilatancy |
| CN107421481B (en) * | 2017-07-04 | 2023-05-02 | 成都理工大学 | Three-dimensional monitoring and early warning multipoint displacement meter for measuring rock mass expansion deformation |
| CN108540560A (en) * | 2018-04-16 | 2018-09-14 | 宁波宏飞信息科技有限公司 | A kind of long-range bridge maintenance control system and method |
| CN113176055A (en) * | 2021-04-22 | 2021-07-27 | 中煤科工集团重庆研究院有限公司 | Long-endurance power supply device for concrete stress-strain detection |
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