CN109186909A - A kind of pseudo static testing device data collection system based on WiFi technology - Google Patents
A kind of pseudo static testing device data collection system based on WiFi technology Download PDFInfo
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The present invention discloses a kind of pseudo static testing device data collection system based on WiFi technology, including multiple data collection stations point, wireless access point, computer；System uses WiFi WLAN, and each data collection station point is connect by WiFi with wireless access point signal；Wireless access point accesses computer by USB, and received data are stored and processed by USB transmission to computer；The data collection station point includes multiple strain acquirement websites, multiple displacement acquisition websites, multiple loads acquisition website.The present invention can reach the acquisition of the parameters such as the strain, displacement, load of each test point of experimental subjects, WiFi wireless transmission, storage and processing, and site layout project signal wire is not needed, it greatly reduced working strength and workload, reduce artificial and material cost, the common mode and DM EMI using transmission line are eliminated, the beneficial effect of the transmission quality of signal is improved.
Description
Technical field
The invention belongs to experimental data acquisition technique field, in particular to a kind of pseudo static testing dress based on WiFi technology
Set data collection system.
Background technique
Earthquake is to cause one of the natural calamity of maximum harm to human habitat up to now, and earthquake can make when occurring
A large amount of building damage even collapses, and the life and property to the people cause serious loss.Building structure is met with by force
When strong earthquake, the inertia force of repeated action makes structure enter inelastic state, generates expendable damage, therefore improve building
The shock resistance of structure is to reduce the main path of earthquake damage.
It is exactly to the mesh of earthquake-resistant structure experiment building structure seismic performance to be grasped by experiment, and then it is anti-to improve building structure
Shake ability.Pseudo-static experimental is also known as Low-cycle Test in earthquake-resistant structure experiment, refers to and applies to structure or structural elements
Time slow test of reciprocation cycle effect is added, structure or structural elements is made to repeat to load and unload in positive and negative both direction
Process, loading characteristic and deformation characteristics of the structure in of reciprocating vibration when simulating earthquake.Pseudo-static experimental is using one
Fixed load control or Bit andits control carries out the load of low all iterative cycles to test specimen, makes test specimen from stress is started to the one of destruction
Kind test method, thus to obtain structure or structural elements elasticity and stiff load-deformation characteristic.Pseudo-static experimental, that is, low week
In cyclic reverse loading experiment, loading speed is lower, but can apply biggish lotus repeatedly to full size cun or close to the structure of full size cun
It carries, research structure part bearing capacity and deformability under course under cyclic loading.Pseudo-static experimental belongs to dynamic loading experiments, repeatedly lotus
The number of load is usually no more than 100 times, and the period of load arrives differ within 300 seconds every time every time for 2 seconds.Pseudo-static experimental object is main
The basic test specimens such as beam, column, beam column website including armored concrete, also include single-layer or multi-layer frame and shear wall test specimen,
Also include masonry test specimen, further include the website test specimen of the different connection types of steel construction.In pseudo-static experimental, a kind of load dress
Setting is one or more reciprocal electro-hydraulic servo actuator, for acting on test specimen the load for generating reciprocal consecutive variations；It is another
Kind loading device is one or more hydraulic jack, is acted on test specimen by roller bearing and generates fixed load, for simulating
Test specimen actual loading situation.Usual pseudo-static experimental is in each test position placement sensor of test specimen for detecting static and dynamic
Parameter.The parameter of detection includes generating deformation position under reciprocal actuator load, the load of hydraulic jack fixation, load action
It moves, generate strain under load action.
Dynamic loading experiments are generally included into pseudo-static experimental, therefore the digit rate of computer data acquiring is than structural static is tested
The data volume of height, acquisition is big.Pseudo static testing device generally uses centralized data acquistion and control system at present, by one
Computer data acquisition, data processing and servo actuator control, wherein part of data acquisition includes that sensor, signal are put
The parts such as big device, computer acquisition card and computer.Usual test specimen test point arranges more than ten to up to a hundred strain as needed
Sensor, arranges several to tens displacement sensors, and arrangement one is arrived several Cyclic Loading sensors, and arrangement one is to several solid
Fixed load transducer.Strain transducer, displacement sensor, load transducer are linked into the voltage letter that amplifier is transformed into standard
Number, then it is linked into the data collecting card of computer-internal installation.Strain, displacement, load signal are converted into digital quantity by computer,
And displacement-load characteristic is obtained, the data of acquisition preserve in the form of a file, for later analysis and application.
The major defect of existing centralization data collection system:
1, price is high, volume weight is big, and especially transducer signal amplifier price, volume and weight are all bigger.
2, the various sensor ordinary circumstances placed on pseudo static testing device test specimen up to tens even up to a hundred,
Wiring and wiring all need to expend many manpower and material resources, and the variation change of test point is also very cumbersome.
3, signal wire transmission can bring common mode and DM EMI, influence the transmission quality of signal and the acquisition essence of signal
Degree.
Summary of the invention
The present invention is for existing in the prior art for providing more than pseudo static testing data collection point and the characteristics of dispersion
A kind of pseudo static testing device data collection system based on WiFi technology, it can be achieved that each test point of experimental subjects strain, position
Acquisition, the WiFi wireless transmission, storage and processing of the parameters such as shifting, load.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of Quintic system based on WiFi technology is real
Experiment device data collection system, including multiple data collection stations point, wireless access point, computer；System uses the wireless office of WiFi
Domain web frame；Each data collection station point is connect by WiFi with wireless access point signal；Wireless access point is accessed by USB and is counted
Calculation machine stores and processs received data by USB transmission to computer；The data collection station point includes multiple answers
Become acquisition website, multiple displacement acquisition websites, multiple loads and acquires website, system composition such as Fig. 1.
Preferably, the data collection station point and wireless access point are all made of low power dissipation design, data collection station point by
Battery power supply, the power supply power supply that wireless access point is provided by computer by USB interface.
Preferably, WiFi structure of the WLAN is made of multiple data collection station points and a wireless access point.
Preferably, the strain acquirement website shows list by four strain transducers, four tunnels strain converter unit, LCD
Member, push-button unit, WiFi and data collection control unit, rf filtering and antenna matching unit, power supply unit, battery pack structure
At；
The signal output end of the strain transducer is connected with the signal input part of corresponding strain converter unit respectively；Institute
State push-button unit, the signal output end of strain converter unit connects with the signal input part of WiFi and data collection control unit
It connects；The LCD display unit, rf filtering and antenna matching unit are connect with WiFi and data collection control unit signal；
Dependent variable data collection station point composition such as Fig. 2；
Strain transducer converts the strain of test point to the variation of resistance-strain sheet resistance, and strain converter unit uses instrument
The differential wave that foil gauge full-bridge circuit exports is transformed into the voltage signal of standard, then is converted by AD converter by table amplifier
At digital quantity；It can be shown on LCD display unit by processing strain instantaneous value, and wireless access can be transferred to by WiFi
Point；Strain acquirement website is equipped with push-button unit, and the measuring range parameters of sensor are arranged by key.
Preferably, the displacement acquisition website shows list by four displacement sensors, four road shift transformation units, LCD
Member, push-button unit, WiFi and data collection control unit, rf filtering and antenna matching unit, power supply unit, battery pack structure
At；
The signal output end of institute's displacement sensors is connected with the signal input part of corresponding shift transformation unit respectively；Institute
State push-button unit, the signal output end of shift transformation unit connects with the signal input part of WiFi and data collection control unit
It connects；The LCD display unit, rf filtering and antenna matching unit are connect with WiFi and data collection control unit signal；
Displacement data acquires website composition such as Fig. 3；
Displacement sensor output resistance is transformed into the voltage signal of standard by shift transformation unit, then is converted by AD converter
At digital quantity；It can be shown on LCD display unit by processing displacement instantaneous value, and wireless access can be transferred to by WiFi
Point；Displacement acquisition site design has push-button unit, and the measuring range parameters of sensor can be set by key.
Preferably, load acquisition website by four force snesors, four road force transformation units, LCD display unit, press
Key unit, WiFi and data collection control unit, rf filtering and antenna matching unit, power supply unit, battery pack are constituted；
The signal output end of the load transducer is connected with the signal input part of corresponding load converter unit respectively；Institute
State push-button unit, the signal output end of load converter unit connects with the signal input part of WiFi and data collection control unit
It connects；The LCD display unit, rf filtering and antenna matching unit are connect with WiFi and data collection control unit signal；
Payload data acquires website composition such as Fig. 4；
Load converter unit uses instrument amplifier, and the differential wave that load transducer electric bridge exports is transformed into standard
Voltage signal, then digital quantity is transformed by AD converter；It can be shown on LCD display unit by handling load instantaneous value, and
Wireless access point can be transferred to by WiFi；Load acquisition site design has push-button unit, and sensing can be set by key
The parameters such as the range of device.
Preferably, the wireless access point is deposited by WiFi and control unit, rf filtering and antenna matching unit, data
Storage unit, USB-SPI interface unit, state indication unit, power supply unit are constituted；
The WiFi and control unit respectively with data storage cell, USB-SPI interface unit, rf filtering and antenna
It is connected with cell signal；The connection of the signal input part of the WiFi and control unit and state indication unit；Wireless access point group
At such as Fig. 5；
Wireless access point can receive strain, displacement and the payload data of each website acquisition by WiFi and keep in number
According to storage unit, these data pass through USB interface again and are transferred to computer；State indication unit indicates current working condition.
Preferably, the strain transducer converter unit that the strain acquirement website is equipped with is using single supply micro energy lose
Precision instrument amplifier INA333 is as translation circuit；The displacement sensor converter unit that the displacement acquisition website is equipped with uses
The impedance inverter circuit of single supply op LM358 composition；The load transducer converter unit that the load acquisition website is equipped with
Using INA333 as translation circuit.
Preferably, the strain acquirement website, displacement acquisition website, load acquisition website, wireless access point WiFi and
The core element that data collection control unit uses is WiFi special chip CC3200.
Preferably, the USB-SPI interface unit of the wireless access point uses USB nonshared control unit FT4222H, it will
The four-wire system SPI interface of CC3200 is converted into USB2.0 interface for connecting with computer.
Preferably, computer digital animation interface applications software is worked out by Lebview, receive what wireless access point uploaded
Strain, displacement and payload data, these data in the form of number and time-history curves and displacement-load characteristic curve on the screen
It shows, is saved in the form of a file for observing acquisition data and experimental result, the data of upload for handling and analyzing.
Compared with prior art, the present invention has the beneficial effects that
1. not needing site layout project signal wire, significantly due to the data using the transmission acquisition of WiFi WLAN
Reduce working strength and workload, reduce artificial and material cost.
2. data collection station point is small in size, light-weight, collection point is arranged and changes simple and easy to do.
3. being eliminated dry using the common mode and differential mode of transmission line due to the data using the transmission acquisition of WiFi WLAN
It disturbs, improves the transmission quality of signal.
4. since data collection station point uses low power dissipation design, by battery-powered, do not need AC220V power supply.
5. the WLAN such as Zigbee, bluetooth using WiFi WLAN compared to other forms have higher biography
Defeated rate, data collection station point does not need the data acquisition that big caching is applicable to fair speed, and realizes number in real time
According to wireless transmission.
Detailed description of the invention
Fig. 1 is the system composition block diagram of the invention；
Fig. 2 is dependent variable data collection station point composition block diagram of the invention；
Fig. 3 is that displacement data of the invention acquires website composition block diagram；
Fig. 4 is that payload data of the invention acquires website composition block diagram；
Fig. 5 is wireless access point composition block diagram of the invention；
Fig. 6 is dependent variable data collection station dot circuit figure of the invention；
Fig. 7 is that displacement data of the invention acquires station circuitry figure；
Fig. 8 is that payload data of the invention acquires station circuitry figure；
Fig. 9 is wireless access point circuit diagram of the invention.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, in the following with reference to the drawings and specific embodiments
It elaborates to the present invention.
In the present embodiment, the strain transducer of strain acquirement website selects resistance strain plate, in order to improve its stability,
Output sensitivity and reduction power consumption, often select high resistance foil gauge, such as model BF1K-3AA, resistance value (R): 1002 ± 0.1 Ω；
Sensitivity coefficient: 2.0 ± 1%.The differential wave of foil gauge full-bridge circuit output becomes by acquisition website internal strain translation circuit
Change the voltage signal of standard into, here using single supply micro energy lose precision instrument amplifier INA333 as translation circuit,
And zero shift circuit is installed additional.As WiFi and data collection control unit core element using CC3200.CC3200
It is that industry first item integrates data processing, data store, the monolithic MCU of embedded WIFI communication function.Inside CC3200
Two big kernels are integrated with, respectively for the high-performance ARM Cortex-M4 processor of User Exploitation and for WiFi communication
Network processing unit CC3100.ARMCortex-M4 processor is contained in the application and development subsystem inside CC3200, operation
Frequency is 80MHz, which provides diversified peripheral hardware for User Exploitation, for example, I2S, SD/MMC, UART, SPI,
I2C and built-in 12 ADC of four-way etc., in addition, the subsystem has also embedded the RAM and appearance that amount of capacity is 256KB
The ROM that size is 64KB is measured, RAM is for storing data, code, and ROM is for storing in peripheral hardware driving and external series Flash
Bootstrap loader.CC3100 belongs to the WiFi network processing subsystem inside CC3200, the also referred to as internet on piece WiFi.
It is the wide-range voltage of 2.1V~3.6V that the power management subsystem of CC3200, which has input voltage range, which can enable
Low-power consumption mode, such as the suspend mode with RTC, about 4 μ A of required electric current.Rf filtering and antenna matching unit use
DEA202450BT integrated band pass filter, centre frequency: 2.45GHz；Bandwidth: 72MHz.Display unit uses 3.3V1602LCD
Display circuit has lower power consumption and stronger character display function, and in no backlight, power consumption electric current is only 2.3mA.It presses
Key unit is used for function key and parameter setting.Since data collection station point is using low power dissipation design, battery pack is used
Power supply.Battery pack uses IFR26650 type 3.2V ferric phosphate lithium cell, capacity 3200mAH, and two sections are placed in series in battery case
In, there is the instruction of LED battery capacity on battery case.Data collection station point interior power supply circuit uses low pressure difference linearity translation circuit
Battery voltage is transformed into+3.3V voltage and used for digital circuit by LM1117-3.3V.Strain acquirement station circuitry figure is shown in figure
6。
In the present embodiment, displacement acquisition website displacement detecting is using conductive north material potentiometer self- recoverage position drawstring displacement sensing
Device, model WPS-S, range journey can need to select 5mm~1000mm according to measurement, linear precision error :≤± 0.05%~
0.08%FS (accurate)；Repeatable accuracy: 0.01%FS~0.005%FS；Potentiometer resistance value has 5K, 10K.Displacement sensor
Potentiometer output is voltage signal by partial pressure switch, is added by the impedance inverter circuit being made of single supply op LM358
12 bit A/D converters inside to CC3200.The other element circuits of displacement acquisition Intra-site are identical as strain acquirement website.Displacement
Acquisition station circuitry figure is shown in Fig. 7.
In the present embodiment, the detection of load acquisition station point loading uses strain-type power (pulling force or pressure) sensor, can adopt
With strain spoke type force snesor, model SIN-LCLY, range can be needed to select according to measurement 1T, 5T, 10T, 20T, 50T,
100T etc..Other technologies parameter includes sensitivity: 2.0 ± 0.05mV/V；Precision :≤0.1%；Output resistance: 750 ± 5 Ω；It is non-
The linearity :≤± 0.03%FS.Force snesor electric bridge output differential wave is transformed into the voltage signal of standard by force transformation unit,
Here using single supply micro energy lose precision instrument amplifier INA333 as translation circuit, and zero shift electricity has been installed additional
Road.The load acquisition other circuit units of Intra-site are identical as strain acquirement website, and load acquires station circuitry figure such as Fig. 8.
In the present embodiment, wireless access point WiFi and control unit core element are using CC3200.External data is deposited
Storage road is here primarily used as data buffer storage, using 1M × 8 low-power consumption SRAM storage chip SST25VF010.USB-
For SPI interface unit using being USB nonshared control unit FT4222H, effect is to be converted into the four-wire system SPI interface of CC3200
USB2.0 interface supports full-speed operation, transmission rate is up to 53.8MbPs for connecting with computer.Since wireless access point is adopted
It is low power dissipation design, therefore power supply is directly provided by USB interface, simplifies the design of power supply.USB supply voltage is+5V,
Interior power supply circuit uses low pressure difference linearity translation circuit LM1117-3.3V, by+5V voltage transformation at+3.3V voltage for number
Circuit uses.Condition indication circuit indicates current working condition.Rf filtering and antenna matching unit are identical as other websites,
Wireless access point circuit diagram is shown in Fig. 9.
In the present embodiment, computer digital animation interface applications software is worked out by Lebview, and major function is control data
Transmission, that is, transmission control command is sent, strain, displacement and the payload data for receiving each data collection station point acquisition upload
Computer is uploaded to wireless access point and by USB interface, these data are with number and time-history curves and displacement-load characteristic
The form of curve shows that, for observing acquisition data and experimental result, the data of upload are in the form of a file on the screen
It saves and is handled for analysis.
In the present embodiment, WiFi acquires the technology of itself when transmitting for data as a kind of WLAN and is based on this
System mainly shows the following aspects advantage: 1, using low power dissipation design, data collection station point is powered using battery, is not needed
AC220 lies prostrate power supply；2, a kind of WLAN such as Zigbee, bluetooth of the WiFi as WLAN compared to other forms has
Higher transmission rate, highest can achieve 54Mbps, be suitable for the data acquisition and data wireless transmission of fair speed；3,
The most important advantage of WiFi is also resided in using data wireless transmission method, does not need arrangement signal wire, can not be by wiring condition
Limitation, therefore the arrangement of each website and test point and to change change more convenient；Site layout project signal wire is not needed greatly
Reduce working strength, workload and experimental cost；4, due to using data wireless transmission method, the common mode of transmission line is eliminated
And DM EMI, improve the transmission quality of signal.
It is described the invention in detail above by embodiment, but the content is only exemplary implementation of the invention
Example, should not be considered as limiting the scope of the invention.Protection scope of the present invention is defined by the claims.All utilizations
Technical solutions according to the invention or those skilled in the art are under the inspiration of technical solution of the present invention, in reality of the invention
In matter and protection scope, designs similar technical solution and reach above-mentioned technical effect, or to made by application range
All the changes and improvements etc. should still belong to patent of the invention and cover within protection scope.It should be noted that in order to clear
It is stated, part and protection scope of the present invention is omitted in explanation of the invention without being directly significantly associated with but this field skill
The statement of component known to art personnel and processing.
Claims (8)
1. a kind of pseudo static testing device data collection system based on WiFi technology, which is characterized in that adopted including multiple data
Collect website, wireless access point, computer；System uses WiFi structure of the WLAN, and each data collection station point passes through WiFi
It is connect with wireless access point signal；Wireless access point accesses computer by USB, and received data are passed through USB transmission to meter
Calculation machine is stored and processed；The data collection station point includes multiple strain acquirement websites, multiple displacement acquisition websites, multiple
Load acquires website.
2. a kind of pseudo static testing device data collection system based on WiFi technology according to claim 1, feature
Be, each data collection station o'clock by four sensors, four road converter units, LCD display unit, push-button unit,
WiFi and data collection control unit, rf filtering and antenna matching unit, power supply unit, battery pack composition；
The signal output end of the sensor is connected with the signal input part of corresponding converter unit respectively；The push-button unit,
The signal output end of converter unit is connect with the input terminal of WiFi and data collection control unit；The LCD display unit is penetrated
Frequency filtering and antenna matching unit are connect with WiFi and data collection control unit signal.
3. a kind of pseudo static testing device data collection system based on WiFi technology according to claim 1, feature
It is, the wireless access point is by WiFi and control unit, rf filtering and antenna matching unit, data storage cell, USB-
SPI interface unit, state indication unit, power supply unit are constituted.
The WiFi and control unit respectively with data storage cell, USB-SPI interface unit, rf filtering and antenna match list
First signal connection；The connection of the signal input part of the WiFi and control unit and state indication unit.
4. a kind of pseudo static testing device data collection system based on WiFi technology according to claim 1, feature
It is, the strain transducer converter unit that the strain acquirement website is equipped with amplifies using single supply micro energy lose precision instrument
Device INA333 is as translation circuit；The displacement sensor converter unit that the displacement acquisition website is equipped with uses single supply op
The impedance inverter circuit of LM358 composition；The load transducer converter unit that load acquisition website is equipped with also using
INA333 is as translation circuit.
5. a kind of pseudo static testing device data collection system based on WiFi technology according to claim 1, feature
It is, the strain acquirement website, displacement acquisition website, load acquisition website, wireless access point WiFi and data acquisition control
The core element that unit uses is WiFi special chip CC3200.
6. a kind of pseudo static testing device data collection system based on WiFi technology according to claim 1, feature
It is, the USB-SPI interface unit of the wireless access point uses USB nonshared control unit FT4222H, by the four-wire system of CC3200
SPI interface is converted into USB2.0 interface for connecting with computer.
7. a kind of pseudo static testing device data collection system based on WiFi technology according to claim 1, feature
It is, the data collection station point and wireless access point are all made of low power dissipation design, and data collection station point is battery powered, wirelessly
The power supply power supply that access point is provided by computer by USB interface.
8. a kind of pseudo static testing device data collection system based on WiFi technology according to claim 1, feature
Be, computer digital animation interface applications software is worked out by Lebview, receive wireless access point upload strain, displacement and
Payload data, these data show on the screen in the form of number and time-history curves and displacement-load characteristic curve,
It is saved in the form of a file for observing acquisition data and experimental result, the data of upload for handling and analyzing.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109596314A (en) * | 2019-01-15 | 2019-04-09 | 交通运输部天津水运工程科学研究所 | A kind of wave height pilot system |
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