CN102184624A - Wireless synchronous sampling method and sampling system for vibrating data - Google Patents
Wireless synchronous sampling method and sampling system for vibrating data Download PDFInfo
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Abstract
The invention discloses a wireless synchronous sampling method and a wireless synchronous sampling system for vibrating data. The method comprises the following steps of: 1, a preparation step: clock homologous treatment, namely uniformly distributing clock signals output from a crystal oscillator to each independent data sampling channel; and synchronization time service, namely synchronously calibrating a real-time clock of each acquirer to calibrate the real-time clocks of different acquirers to the same time; 2, transmitting a data acquisition command; and 3, starting data synchronous acquisition. The wireless synchronous sampling method and the wireless synchronous sampling system can realize extremely high wireless synchronization accuracy.
Description
Technical field
The present invention relates to a kind of vibration data wireless synchronization method of sampling and sampling system.
Background technology
Existing most of bridge vibration data acquisition has heavy ground installation work, needs the tester frequently to commute the working-yard, and labour intensity is big, and data acquisition and transmission are inconvenient, and the automaticity of information management is low, is difficult to satisfy the requirement of present information construction.Therefore must develop a kind of novel distributed remote wireless monitor system, reduce engineering staff's working strength, improve accuracy, the reliability of data acquisition, and realize intellectuality, the information system management of temperature and stress data.
Some bridge vibration data acquisition system (DAS) has been used wireless transmission, reduced installation work, but these systems fail to take at wireless data acquisition system the synchronisation measures of data acquisition, correlative connection between the data of each different acquisition point, between the parameter such as different physics of each point, mechanics is few, this no data in synchronization acquisition method lacks the discriminating power to one-piece construction safety, and these improper data will influence the confidence level of monitoring result.
Summary of the invention
Technical matters to be solved by this invention is to propose a kind of vibration data wireless synchronization method of sampling and sampling system, and this vibration data wireless synchronization method of sampling and sampling system can realize high wireless synchronization precision.
Technical solution of the present invention is as follows:
A kind of vibration data wireless synchronization method of sampling may further comprise the steps:
Step 1: preparation process:
The clock homology is handled: in same collector inside, the clock signal of crystal oscillator output is distributed unitedly to each data sampling channel independently;
Time service synchronously: each collector is calibrated real-time clock simultaneously, the real-time clock of different mining storage was calibrated on the same time;
Step 2: send data acquisition command: host computer send to start acquisition by wireless mode, and command context comprises data acquisition start-up time;
Step 3: log-on data synchronous acquisition: after collector receives orders, constantly inquire about its inner real-time clock, in case real-time clock arrives the start-up time in the acquisition, then log-on data collection, at last the vibration data that collects is sent to host computer, finally be implemented under the radio transmission conditions data synchronization collection effect in the different mining storage by collector.
Set in a plurality of collectors any as main collector, remaining collector is from collector, all links to each other with an output interface of main collector by lead from the external interrupt interface of collector;
Described synchronous time service step is:
Host computer sends the real-time clock parameter that needs setting;
After each collector is received the real-time clock parameter, do not carry out time service immediately, but enter the time service state of waiting for;
After all collectors were received the real-time clock parameter, passback was given after the host computer answer signal, and it is interrupt trigger signal to respectively sending the time service trigger pip from collector that host computer is notified main collector;
After each collector is received the time service trigger pip, the real-time clock parameter is write the real-time clock module of this collector, thereby the calibration of the real-time clock of each collector is all to the same time.
The form of the Frame of real-time clock parameter is: data frame head, date, Hour Minute Second, data check position and postamble.
A kind of vibration data wireless synchronization sampling system comprises main control end equipment and data acquisition end equipment; Main control end equipment comprises host computer and the main control end wireless network module that links to each other with host computer, data acquisition end equipment comprises data acquisition end wireless network module, a plurality of vibration transducer and a plurality of collector, a plurality of collectors all join with data acquisition end wireless network module, and each collector is connected with at least one vibration transducer;
The main control end wireless network module is connected with data acquisition end wireless network module radio communication;
Vibration data wireless synchronization sampling system adopts the aforesaid vibration data wireless synchronization method of sampling to realize the synchronized sampling of vibration data.
Described data acquisition end equipment is many covers.
Beneficial effect:
The vibration data wireless synchronization method of sampling of the present invention and sampling system have following characteristics:
(1) Xian Jin wireless synchronization Sampling techniques.Vibration data wireless synchronization sampling system of the present invention is a based on network monitoring system, therefore also has clock synchronization issue.Because such monitoring system is to constitute a distributed real-time acquisition system by many hardware collecting devices in LAN (Local Area Network), how reaching with identical clock in the slave computer of these monitoring image data is benchmark, trigger its image data, the data that make it to collect have comparative in time or on the sequencing of incident, make data monitored have its clear physical meaning, thereby realize data processing fast and accurately.
Native system adopts advanced synchronous sampling technique can guarantee the synchronous acquisition of bridge, and concrete implementation method is: in same collector inside, adopt high-performance high stability (10
-8) constant-temperature crystal oscillator, the frequency of constant-temperature crystal oscillator is 100MHz, the crystal oscillator frequency division to 100KHz unified for give eight independently the ADC sampling channel frequency is provided, guarantee that the inner sample-synchronous degree of same collector reaches 10 at least
6Second; Method for synchronous between the different mining storage is, before gathering, earlier each collector is calibrated real-time clock, the real-time clock of collector was calibrated on the same time, host computer is sent in sometime startup command during measuring then, and collector is received just log-on data collection synchronously after this order.
Comprehensive above simultaneous techniques has solved the synchronous difficult problem in the wireless sampling system, has guaranteed bridge security monitoring sampled data consistance, obtains total data acquisition and reaches 0.8 microsecond lock in time.Can find at present the up-to-date wireless synchronization technology document 1[Yang Hong deep pool that sees reference, Han Liguo, Lin Jun, no cable telemetric seismic instrument Network Synchronization Sampling techniques, " instrumental technique and sensor ", 2009 the 3rd phases.], its wireless synchronization time is about 3.2 microseconds, with the difference of list of references 1 maximum be the method for time service, time service method in this project is a mode of using wired connection in advance, its time service precision is in several nanoseconds, and the time service method that list of references 1 is is the wireless time service of GPS, and its time service precision is about 50 nanoseconds, so this project approach wireless synchronization precision will be higher than list of references 1.
(2) data acquisition of very high degree of precision.Native system adopts following method to improve the precision of data acquisition: employing waits ratio reference synchronization power supply; The wiring of multilayer board simulation ground level; 24 high-performance independence ADC chips; Digitally the plane separates with the simulation ground level is strict; High smoothness power supply design reduces AD noise etc.By above means, sampling precision can reach the high precision level of industry, can reach 21 significance bit under the 1KHz sample frequency, ± 0.0010% nonlinearity, and the significance bit of domestic 24 collections of report is generally about 20.
(3) high speed wireless data is gathered in real time.Data acquisition can solve the wiring of bridge in the detecting problems such as work is numerous and diverse, cable serious wear, cable protection, keeping difficulty of taking out stitches well; improve data acquisition efficiency effectively; and signal picker can many network interconnections, expand the data acquisition channel number greatly.Native system adopts high performance wireless local screen component, and (as AirWDS AOB2400-26/H is a carrier class wireless aps that has very-high performance, meet the 802.11b/g standard, can provide on a large scale, highdensity wireless access, output power is up to 400/1000mW, can provide bandwidth, but native system is not limited to adopt this assembly up to 54M), satisfy the requirement of native system data transmission capacity and real-time.
Description of drawings
Fig. 1 is the one-piece construction figure of the vibration data wireless synchronization method of sampling and sampling system.
Embodiment
Below with reference to the drawings and specific embodiments the present invention is described in further details:
Embodiment 1:
As Fig. 1,
A kind of vibration data wireless synchronization sampling system comprises main control end equipment and data acquisition end equipment; Main control end equipment comprises host computer and the main control end wireless network module that links to each other with host computer, data acquisition end equipment comprises data acquisition end wireless network module, a plurality of vibration transducer and a plurality of collector, a plurality of collectors all join with data acquisition end wireless network module, and each collector is connected with at least one vibration transducer;
The main control end wireless network module is connected with data acquisition end wireless network module radio communication;
Described data acquisition end equipment is many covers.
The vibration data wireless synchronization method of sampling below vibration data wireless synchronization sampling system adopts realizes the synchronized sampling of vibration data:
Step 1: preparation process:
The clock homology is handled: in same collector inside, the clock signal of crystal oscillator output is distributed unitedly to each data sampling channel independently;
Time service synchronously: each collector is calibrated real-time clock simultaneously, the real-time clock of different mining storage was calibrated on the same time;
Step 2: send data acquisition command: host computer send to start acquisition by wireless mode, and command context comprises data acquisition start-up time;
Step 3: log-on data synchronous acquisition: after collector receives orders, constantly inquire about its inner real-time clock, in case real-time clock arrives the start-up time in the acquisition, then log-on data collection, at last the vibration data that collects is sent to host computer, finally be implemented under the radio transmission conditions data synchronization collection effect in the different mining storage by collector.
Set in a plurality of collectors any as main collector, remaining collector is from collector, all links to each other with an output interface of main collector by lead from the external interrupt interface of collector;
Described synchronous time service step is:
Host computer sends the real-time clock parameter that needs setting;
After each collector is received the real-time clock parameter, do not carry out time service immediately, but enter the time service state of waiting for;
After all collectors were received the real-time clock parameter, passback was given after the host computer answer signal, and it is interrupt trigger signal to respectively sending the time service trigger pip from collector that host computer is notified main collector;
After each collector is received the time service trigger pip, the real-time clock parameter is write the real-time clock module of this collector, thereby the calibration of the real-time clock of each collector is all to the same time.
The form of the Frame of real-time clock parameter is: data frame head, date, Hour Minute Second, data check position and postamble.
Native system is applied to remote wireless data collection system and data acquisition simultaneous techniques in bridge robotization health monitoring and the diagnostic field, the data that collect are delivered to control center away from bridge by communication system after pre-service, to the further analyzing and processing of data, obtain the conclusions such as health status assessment, breakdown diagnosis, residual life evaluation, traffic control and maintenance decision of bridge by control center.Like this, not only can alleviate professional and technical personnel's labour intensity greatly, save manpower, and control center can grasp the operation conditions of bridge at any time, in time pinpoint the problems and take corresponding measure, avoid serious accident to take place.
The wireless vibration data acquisition system (DAS) is made up of power supply, signal picker, multichannel pmultiple amplifier, network communication module and host computer.The effect of signal picker is through amplification, filtering, collection, data are sent on the central control system analyze then with sensor signal, it is the key of total system, connect sensor and central control system two large divisions, the key link of building feature data is provided.Therefore, also more and more higher to the requirement of signal picker, comprising high oscillating region, the hyperchannel of sampling and the characteristics such as sampling and real-time of running simultaneously.Native system adopts high performance WLAN (wireless local area network) IEEE802.11 agreement to set up the wireless data transmission network of collection point and monitoring center.
The host computer major function comprises:
(1) windows display of data:
The waveform of node data and numerical value show;
The convergent-divergent of waveform, translation, mouse are followed the tracks of;
Digital integration, power spectrum density show;
Nodal information, communications status, association window are checked;
(2) database storing and query function:
Adopt the private database platform, storage and Query Dates time, node, data, other information, memory capacity relies on the hard disc of computer size; The result of inquiry shows in the mode of figure or text.
(3) parameter setting: communications setting, enlargement factor, triggering mode etc.;
(4) Signal Pretreatment: [being prior art] such as digital filtering, spectrum analyses;
The wireless vibration data acquisition system (DAS) is to combine a plurality of domain knowledges such as modern sensor technology, signal testing analysis and treatment technology, data transmission mechanics of communication and structure analysis prediction theory, the system product that the accumulation of putting into practice through a large amount of rig-site utilization develops, can test, store, analyze and provide the multiple information of bridge and building structure state in the operation, the total state is carried out continuous, real-time, online status monitoring and assessment.
The using method that regards to native system down is illustrated.
In the sensor installation process, riding position can be settled according to client's needs or actual conditions, and the sensor installed surface must be adjacent to glue or screw in addition fastening with tested entity fully again in the time of fixedly.
Wireless vibration data acquisition unit interface comprises switch, pilot lamp, charge port, wireless network interface, computing machine network interface five parts, and inside carries lithium battery.Sensor connector is connected to the acquisition port of Acquisition Instrument, with a direct-through line netting twine socket of the wireless network interface of collector and wireless bridge is coupled together again.Confirm to open after errorless switch (pilot lamp is bright) on the Acquisition Instrument.When electric weight is not enough, need in time charge the battery, the output terminal of charger (round mouth plug with one heart) connect Acquisition Instrument+12V interface (also being concentric round mouth), input end connects 220V then, confirms to open 220V power supply (pilot lamp is bright) after errorless.Switch: be used for the power on/off of control instrument.
Connect sensor, connect probe power, at host computer start-up operation interface each node of bridge is sampled and monitor.
Claims (5)
1. a vibration data wireless synchronization method of sampling is characterized in that, may further comprise the steps:
Step 1: preparation process:
The clock homology is handled: in same collector inside, the clock signal of crystal oscillator output is distributed unitedly to each data sampling channel independently;
Time service synchronously: each collector is calibrated real-time clock simultaneously, the real-time clock of different mining storage was calibrated on the same time;
Step 2: send data acquisition command: host computer send to start acquisition by wireless mode, and command context comprises data acquisition start-up time;
Step 3: log-on data synchronous acquisition: after collector receives orders, constantly inquire about its inner real-time clock, in case real-time clock arrives the start-up time in the acquisition, then log-on data collection, at last the vibration data that collects is sent to host computer, finally be implemented under the radio transmission conditions data synchronization collection effect in the different mining storage by collector.
2. the vibration data wireless synchronization method of sampling according to claim 1, it is characterized in that, set in a plurality of collectors any as main collector, remaining collector is from collector, all links to each other with an output interface of main collector by lead from the external interrupt interface of collector;
Described synchronous time service step is:
Host computer sends the real-time clock parameter that needs setting;
After each collector is received the real-time clock parameter, do not carry out time service immediately, but enter the time service state of waiting for;
After all collectors were received the real-time clock parameter, passback was given after the host computer answer signal, and it is interrupt trigger signal to respectively sending the time service trigger pip from collector that host computer is notified main collector;
After each collector is received the time service trigger pip, the real-time clock parameter is write the real-time clock module of this collector, thereby the calibration of the real-time clock of each collector is all to the same time.
3. the vibration data wireless synchronization method of sampling according to claim 2 is characterized in that the form of the Frame of real-time clock parameter is: data frame head, date, Hour Minute Second, data check position and postamble.
4. a vibration data wireless synchronization sampling system is characterized in that, comprises main control end equipment and data acquisition end equipment; Main control end equipment comprises host computer and the main control end wireless network module that links to each other with host computer, data acquisition end equipment comprises data acquisition end wireless network module, a plurality of vibration transducer and a plurality of collector, a plurality of collectors all join with data acquisition end wireless network module, and each collector is connected with at least one vibration transducer;
The main control end wireless network module is connected with data acquisition end wireless network module radio communication;
Vibration data wireless synchronization sampling system adopts each described vibration data wireless synchronization method of sampling of claim 1-3 to realize the synchronized sampling of vibration data.
5. vibration data wireless synchronization sampling system according to claim 1 is characterized in that, described data acquisition end equipment is many covers.
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| CN104267634A (en) * | 2014-09-05 | 2015-01-07 | 上海应用技术学院 | Wireless synchronous collecting system |
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