CN109946013A - Fluid media (medium) near wall frictional resistance data collection system based on optical sensor - Google Patents
Fluid media (medium) near wall frictional resistance data collection system based on optical sensor Download PDFInfo
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- CN109946013A CN109946013A CN201910167651.2A CN201910167651A CN109946013A CN 109946013 A CN109946013 A CN 109946013A CN 201910167651 A CN201910167651 A CN 201910167651A CN 109946013 A CN109946013 A CN 109946013A
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Abstract
The fluid media (medium) near wall frictional resistance data collection system based on optical sensor that the present invention provides a kind of, it include: near wall frictional resistance test subsystems in the fluid media (medium) based on optical sensor, the displacement signal generated for acquiring sample to be tested by the frictional resistance of fluid media (medium)；High speed acquisition, transimission and storage subsystem based on high-performance capture card, export for receiving displacement signal, and after displacement signal is converted to discrete digital signal；Visualization based on LabVIEW and Matlab reads analyzing subsystem and discrete digital signal is converted to shift value, calculates near wall frictional resistance value in fluid media (medium) according to shift value for receiving discrete digital signal and handling discrete digital signal.
Description
Technical field
The present invention relates near wall frictional resistance measuring system more particularly to a kind of fluid media (medium)s based on optical sensor
Near wall frictional resistance data collection system.
Background technique
Currently, the domestic and international application measurement of near wall frictional resistance and data collection system in fluid media (medium) have had very
It is a variety of.Near wall shear stress mainly is acquired with resistance sensor for the measurement method of near wall frictional resistance, is used
There are mainly of two types for resistance sensor: one is heat-sensitive type, another kind is floating type.Acquire the resistance of resistance sensor
The measurement accuracy of signal is higher, can achieve 0.01N, and resistance sensor Data Data acquisition system can directly acquire nearly wall
The data of face frictional resistance, but it also has the drawback that
1. influence of the resistance sensor vulnerable to temperature and magnetic field not only reduces measurement accuracy, but also influences test mould
The measurement result of type；
2. resistance sensor measures micro-structure surface near wall fricting resistance device in fluid media (medium) and builds complexity, take
The device built not only will affect the precision of measurement, while will affect near wall flow field, seriously affect experimental result；
3. Data Data acquisition system use traditional single cycle data collection system, not can avoid data transmitting lose,
The disadvantages such as data acquisition and processing (DAP) speed is low；
4. data collection and analysis software is simpler, only the course curve of display data transmissions to host computer, cannot be according to choosing
Sampling interval is selected, the sampled result under different operating conditions is compared.
Summary of the invention
(1) technical problems to be solved
The purpose of the present invention is to provide a kind of, and the fluid media (medium) near wall frictional resistance data based on optical sensor are adopted
Collecting system, to solve at least one above-mentioned technical problem.
(2) technical solution
An aspect of of the present present invention provides a kind of fluid media (medium) near wall frictional resistance data based on optical sensor and adopts
Collecting system characterized by comprising near wall frictional resistance test subsystems in the fluid media (medium) based on optical sensor are used
In the displacement signal that acquisition sample to be tested is generated by the frictional resistance of fluid media (medium)；High speed based on high-performance capture card is adopted
Collection, transimission and storage subsystem, are output to for receiving displacement signal, and after displacement signal is converted to discrete digital signal
Position machine；Analyzing subsystem is read in visualization based on LabVIEW and Matlab, for receiving discrete digital signal and to dispersion number
Word signal is handled, and discrete digital signal is converted to shift value, is calculated near wall in fluid media (medium) according to shift value and is rubbed
Wipe Resistance Value.
In some embodiments of the present disclosure, near wall frictional resistance test in the fluid media (medium) based on optical sensor
System includes: optical encoder；High speed acquisition, transimission and storage subsystem based on high-performance capture card include: data acquisition
Card；It includes: host computer that analyzing subsystem is read in visualization based on LabVIEW and Matlab；Data collecting card receives host computer
The binary instruction of transmission samples, optics according to the orthogonal differential signal that the binary instruction exports optical encoder
For encoder output TTL pulse signal to data collecting card, data collecting card exports discrete digital signal to host computer.
In some embodiments of the present disclosure, high speed acquisition, transimission and storage subsystem based on high-performance capture card are also
It include: transmission module, transmission module includes fiber-optic signal line and aviation plug；The TTL pulse signal of optical encoder output is logical
It crosses fiber-optic signal line and aviation plug is transmitted to data collecting card；Gauze and fire resisting corrosion resistant are isolated by multilayer outside fiber-optic signal line
The elastomeric skin layer of erosion is protected, and aviation plug is connected to fiber-optic signal thread end, can be realized multi-channel data transmission.
In some embodiments of the present disclosure, data collecting card includes: multiple channels and high-speed counter；Each optics is compiled
Code device enters high-speed counter by a channel of data collecting card, and the count value of high-speed counter is sent by pci bus
To host computer.
In some embodiments of the present disclosure, host computer is connect by communication module with data collecting card；Communication module is logical
It crosses communications protocol and differentiation technology in address reads the data in each channel in data collecting card, realize multi-channel data acquisition.
In some embodiments of the present disclosure, host computer includes: processing module, the function library based on LabVIEW, realizes institute
It states discrete digital signal and is converted to shift value, section area mean value and near wall friction force value are obtained based on shift value；Display module,
Based on LabVIEW user program main interface, discrete digital signal is acquired in real time, shift value is shown in a graphical form, simultaneously
It shows real-time displacement curve and near wall friction resistance curve under various working, and shows section area mean value based on Matlab and close
Wall friction force value；Memory module stores the shift value of the discrete digital signal form, and that realizes data establishes mesh automatically
Record, document function.
In some embodiments of the present disclosure, near wall frictional resistance test in the fluid media (medium) based on optical sensor
System further include: media stage, the media stage are sink or wind-tunnel.
In some embodiments of the present disclosure, near wall frictional resistance test in the fluid media (medium) based on optical sensor
System further include: measurement module, comprising: flexible micro- beam, kickboard and grating scale, flexible micro- beam generate displacement in fluid media (medium),
Material is polyethylene.
In some embodiments of the present disclosure, the three subsystems integrate GPIB, VXI, TCP/IP, ActiveX standard
Communications protocol.
(3) beneficial effect
Fluid media (medium) near wall frictional resistance data collection system based on optical sensor of the invention, compared to existing
Technology has at least the following advantages:
(1) present invention can directly precisely measure out the flowage friction resistance of sophisticated functions surface near wall, have by
The features such as ambient temperature, electromagnetic field, pressure disturbances are smaller, are easy calibration, and measurement accuracy is 0.1 μm high, and measurement range is wide, can solve
Certainly traditional means of experiment can only measure the problem of smooth surface, fill up the blank that near wall frictional resistance accurately measures technology；
(2) present invention can parallel execution of data the operation such as acquisition, post-processing and display, it is ensured that data acquisition
Continuity and accuracy have many advantages, such as high responsiveness, timeliness, data not easy to lose；
(3) present invention is connected using Multi-serial port, and multichannel collecting may be implemented in host computer, controls multiple acquisition measurements
Device, apparatus of the present invention can transplant the measurement acquisition of different micro-structure near wall frictional resistance simultaneously, meet different experiments
Demand.
Detailed description of the invention
Fig. 1 is near wall frictional resistance data acquisition system in the fluid media (medium) based on optical sensor of the embodiment of the present invention
The structural block diagram of system；
Fig. 2 is near wall frictional resistance data acquisition system in the fluid media (medium) based on optical sensor of the embodiment of the present invention
The circuit diagram of system；
Fig. 3 is the data flow diagram of Fig. 1；
Fig. 4 is working mechanism's schematic diagram of Fig. 3 host computer；
Fig. 5 is working mechanism's detail drawing of Fig. 3 host computer；
Fig. 6 is the work flow diagram of Fig. 3 host computer；
Fig. 7 is near wall frictional resistance data acquisition system in the fluid media (medium) based on optical sensor of the embodiment of the present invention
The structural schematic diagram of system.
[symbol description]
1, media stage 2, micro- beam load cell
3, optical location moves unit 4, data collecting card
5, sample to be tested 6, glue
7, sample stage 8, bolt
9, grating scale 10, optical glass
11, optical encoder 12, host computer
13, sample support platform
Specific embodiment
The side of optical sensing is used for the measurement of resistance sensor frictional resistance and the defect of acquisition system, the disclosure
Formula realizes high-speed multithreading parallel processing, has the advantages that high response, timeliness height and not volatile data.
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
The embodiment provides near wall frictional resistance data in a kind of fluid media (medium) based on optical sensor
Acquisition system, as shown in Figure 1, comprising: near wall frictional resistance test subsystems, base in the fluid media (medium) based on optical sensor
It is read point in the high speed acquisition of high-performance capture card, transimission and storage subsystem and visualization based on LabVIEW and Matlab
Analyse subsystem.Above three subsystem is integrated with the standard communication protocols such as GPIB, VXI, TCP/IP, ActiveX, is based on multithreading
Parallel processing architecture, can parallel execution of data the operation such as acquisition, post-processing and display, it is ensured that the company of data acquisition
Continuous property and accuracy, have many advantages, such as high responsiveness, timeliness, data not easy to lose.
As shown in Fig. 2, near wall frictional resistance test subsystems include: optics in the fluid media (medium) based on optical sensor
Encoder M2000.The subsystem of high speed acquisition, transimission and storage based on high-performance capture card includes: data collecting card PCI-
1784 and transmission module, transmission module include fiber-optic signal line and aviation plug；Visualization based on LabVIEW and Matlab is read
Taking analyzing subsystem includes: host computer: the PC machine based on Labview.Host computer passes through the number of communication module and optical encoder
It is connected according to capture card 4.
PCI-1784 receives the binary instruction that host computer is sent, and is exported according to the instruction to optical encoder 11 orthogonal
Differential signal is sampled.M2000 exports TTL pulse signal to PCI-1784, and PCI-1784 is discrete by fiber optic cables output
Digital signal is in the LabVIEW background data base of PC machine.The TTL pulse signal that optical encoder 11 exports passes through fiber-optic signal
Line and aviation plug are transmitted to PCI-1784.By the elastomeric skin layer of multilayer isolation gauze and fire-resistant corrosion-resistant outside fiber-optic signal line
Protection, aviation plug are connected to fiber-optic signal thread end, can be realized multi-channel data transmission.PC machine to discrete digital signal into
Row processing realizes that discrete digital signal converts displacement signal, is calculated in fluid media (medium) according to real-time acquisition multichannel shift value
Near wall frictional resistance value is simultaneously displayed in PC machine LabVIEW user application main interface.
As shown in figure 3, PCI-1784 include: channel 1, channel 2 ..., channel N and high-speed counter, each channel connection
One sensor, channel 1 connect sensor 1, and channel 2 connects sensor 2.PCI-1784 could support up four optical encoders
11, each optical encoder 11 enters high-speed counter by a channel of PCI-1784, and the count value of high-speed counter is logical
It crosses pci bus and is sent to host computer.Communication module is distinguished each in technology reading data collecting card by communications protocol and address
The data in channel realize multi-channel data acquisition.If it is desired to realize the extension of more multichannel, it can be by the way that multi-block data capture card be arranged
Mode realize.
Host computer includes: processing module, display module and memory module.
Processing module is based on LabVIEW function library abundant, realizes that the discrete digital signal is converted to displacement signal,
Region average and near wall friction force value are obtained based on displacement signal.
Display module, be based on LabVIEW user program main interface, acquire discrete digital signal in real time, by displacement signal with
The form of figure is shown, while showing real-time displacement curve and near wall friction resistance curve under various working, and is shown and be based on
The section area mean value and near wall friction force value of Matlab.
Memory module stores the displacement signal of the discrete digital signal form, and that realizes data establishes catalogue, text automatically
The operation such as shelves.
Parallel processing architecture of the LabVIEW of host computer based on multithreading, synchronous control technique-queue, event, state
Machine, Producer-consumer problem mode, it is ensured that the continuity and accuracy of data acquisition have high responsiveness, timeliness, no
The advantages that data easy to be lost.
As shown in figure 4, traditional single cycle data collection system not can avoid loss of data, data acquisition and processing (DAP) speed
Low disadvantage.The present invention uses the producer/consumer's mode of LabVIEW, by queue control technology, realizes multi-channel data
Real-time acquisition, real-time processing data and storage.Host computer of the invention is using " at event mechanism-state machine-event
The parallel processing architecture of reason mechanism-subtask ".
Shown in Figure 5, host computer LabVIEW of the present invention establishes multiple queues: data queue 1, data queue 2 and event
Queue.
The discrete digital signal of the caching acquisition of data queue 1, data queue 2 cache displacement signal.Event queue caching is each
A event, these events include: data acquisition, data processing, data storage, drawing, failure, stopping and other events.
The work of the parallel processing architecture of " event mechanism-state machine-event processing mechanism-subtask " of the invention
Process are as follows:
The generation of event mechanism monitoring event.When the event occurs, which is taken out and is notified from event queue
State machine-event processing mechanism, state machine-event processing mechanism are handled the event as subtask.
With the data instance in the channel 1 of host computer processing data collecting card 4.
If the event occurred is data acquisition, state machine-event processing mechanism log-on data collecting thread, thread acquisition
Discrete digital signal is simultaneously sent into data queue 1 by discrete digital signal.
If the event occurred is data processing, state machine-event processing mechanism log-on data handles thread, and the thread is from number
It is handled according to discrete digital signal is taken out in queue 1, obtains displacement signal, and displacement signal is sent into data queue 2.
If the event occurred is that data store, state machine-event processing mechanism log-on data storage thread, the thread is from number
According to taking out displacement signal in queue 2, and displacement signal is stored as text file.
If the event occurred is to draw, the starting of state machine-event processing mechanism is drawn processing thread, and the thread is from data team
Displacement signal is taken out in column 2, and carries out plot and display processing.
If the event occurred is failure, state machine-event processing mechanism startup separator handles thread, which carries out failure
Alarm, after trouble shooting, which releases failure.
When the data in other channels of host computer processing data collecting card, treatment process is same as described above, thus
Host computer can all data collecting cards of parallel processing whole channels data.
By the above-mentioned means, the present invention can parallel execution of data the operation such as acquisition, processing and display, it is ensured that number
According to the continuity and accuracy of acquisition, have many advantages, such as high responsiveness, timeliness, data not easy to lose.The present invention is using more strings
Mouth is connected, and multichannel collecting may be implemented in host computer, is controlled multiple optical locations and is moved units, while can be transplanted to difference
The measurement of micro-structure near wall frictional resistance acquires, and meets different experiment demands.
As shown in fig. 6, parameter is arranged in host computer first, starts software and initialize.Event is pressed into event team by state machine
Column monitor event mechanism.When initialization failure, warning note occurs.
When data acquisition event occurs, log-on data collecting thread calls 32bit DLL acquisition data and is sent into data
Data queue 1.
When data processing event occurs, log-on data post-processes thread, which takes out discrete digital from data queue 1
Signal is handled, and post-processing data are sent into data queue 2.
When data storage events occur, log-on data stores thread, which takes out data from data queue 2, and will
Data are stored as text file.
When drawing event occurs, start drawing thread, which takes out data from data queue 2, and draw and
Display processing.
When the event of breaking down, startup separator handles thread, carries out troubleshooting and alarm.
As shown in fig. 7, near wall frictional resistance test subsystems are (in such as Fig. 3 in the fluid media (medium) based on optical sensor
Sensor 1 and sensor 2) by sample support platform 13 place sample, further include: media stage 1 and measurement module.
Media stage 1, internal be full of have fluid media (medium) (such as water flow), and the bottom of the media stage 1 is provided with aperture,
The inside of the aperture is placed with sample to be tested 5, and the fluid media (medium) flows through sample to be tested 5.The media stage 1 includes but not
It is limited to circulating water tunnel, sink, wind-tunnel.
Measurement module is located at 5 lower section of sample to be tested, comprising: micro- beam load cell 2 and optical location move unit 3.It is micro-
Beam load cell 2 includes: sample stage 7, and sample to be tested 5 is connected by glue 6 with sample stage 12.Sample stage 7 is fixed by bolt 8
On media stage 1.The measurement module includes flexible micro- beam, kickboard and grating scale 9, and the micro- beam of the flexibility supports kickboard, to be measured
Sample 5 is fixed in kickboard, and grating scale 9 is located at below flexible micro- beam, and with its adhesion, since the sample to be tested surface is in fluid
Frictional resistance during media flow by fluid media (medium) makes sample to be tested 5 and flexible micro- beam generate the displacement along flow direction, together
When grating scale 9 also generate the displacement of flow direction, the measurement module is for measuring the displacement.The micro- beam of flexibility produces in fluid media (medium)
Raw displacement, structure type include but is not limited to form of the present invention, and material includes but is not limited to the polyethylene that the present invention uses.
Acquisition module is located at below the measurement module, and the acquisition module includes optical encoder 11, the optical encoding
Device 11 is located at 9 lower section of grating scale, and when grating scale 9 generates flow direction displacement, host computer 11 sends a command to data collecting card 4, number
The orthogonal differential signal relevant to displacement that optical encoder 11 receives the laser of reflection and generates is acquired according to capture card 4.
It can also include the optical glass 10 between optical encoder 11 and grating scale 9 that the optical location, which moves unit 3,
Can prevent water from entering the square chamber below optical glass 10, at the same can also light transmission, be conducive to accurately measure displacement.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in guarantor of the invention
Within the scope of shield.
Claims (9)
1. a kind of fluid media (medium) near wall frictional resistance data collection system based on optical sensor characterized by comprising
Near wall frictional resistance test subsystems in fluid media (medium) based on optical sensor, are flowed for acquiring sample to be tested
The frictional resistance of body medium and the displacement signal generated；
High speed acquisition, transimission and storage subsystem based on high-performance capture card, for receiving displacement signal, and by displacement signal
It is exported after being converted to discrete digital signal；
Analyzing subsystem is read in visualization based on LabVIEW and Matlab, for receiving discrete digital signal and to dispersion number
Word signal is handled, and discrete digital signal is converted to shift value, is calculated near wall in fluid media (medium) according to shift value and is rubbed
Wipe Resistance Value.
2. fluid media (medium) near wall frictional resistance data collection system as described in claim 1, which is characterized in that be based on light
Learning near wall frictional resistance test subsystems in the fluid media (medium) of sensor includes: optical encoder；Based on high-performance capture card
High speed acquisition, transimission and storage subsystem include: data collecting card；Visualization based on LabVIEW and Matlab, which is read, to divide
Analysing subsystem includes: host computer；
Data collecting card receives the binary instruction that host computer is sent, and is exported just according to the binary instruction to optical encoder
Sub-signal of reporting to the leadship after accomplishing a task is sampled, and optical encoder exports TTL pulse signal to data collecting card, and data collecting card exports dispersion number
Word signal is to host computer.
3. fluid media (medium) near wall frictional resistance data collection system as claimed in claim 2, which is characterized in that based on height
The high speed acquisition of performance capture card, transimission and storage subsystem further include: transmission module, transmission module include fiber-optic signal line and
Aviation plug；
The TTL pulse signal of optical encoder output is transmitted to data collecting card by fiber-optic signal line and aviation plug；Optical fiber
It is protected outside signal wire by the elastomeric skin layer that gauze and fire-resistant corrosion-resistant is isolated in multilayer, aviation plug is connected to fiber-optic signal line end
Portion can be realized multi-channel data transmission.
4. fluid media (medium) near wall frictional resistance data collection system as claimed in claim 3, which is characterized in that data are adopted
Truck includes: multiple channels and high-speed counter；Each optical encoder enters high speed by a channel of data collecting card
The count value of counter, high-speed counter is sent to host computer by pci bus.
5. fluid media (medium) near wall frictional resistance data collection system as claimed in claim 4, which is characterized in that host computer
It is connect by communication module with data collecting card；Communication module distinguishes technology by communications protocol and address and reads data collecting card
In each channel data, realize multi-channel data acquisition.
6. fluid media (medium) near wall frictional resistance data collection system as described in claim 1, which is characterized in that host computer
Include:
Processing module, the function library based on LabVIEW realize that the discrete digital signal is converted to shift value, are based on shift value
Obtain section area mean value and near wall friction force value；
Display module is based on LabVIEW user program main interface, discrete digital signal is acquired in real time, by shift value with figure
Form is shown, while showing real-time displacement curve and near wall friction resistance curve under various working, and is shown based on Matlab's
Section area mean value and near wall friction force value；
Memory module stores the shift value of the discrete digital signal form, and that realizes data establishes catalogue, document behaviour automatically
Make.
7. fluid media (medium) near wall frictional resistance data collection system as described in claim 1, which is characterized in that be based on light
Learn near wall frictional resistance test subsystems in the fluid media (medium) of sensor further include: media stage, the media stage are water
Slot or wind-tunnel.
8. fluid media (medium) near wall frictional resistance data collection system as described in claim 1, which is characterized in that be based on light
Learn near wall frictional resistance test subsystems in the fluid media (medium) of sensor further include: measurement module, comprising: flexible Wei Liang, float
Plate and grating scale, flexible micro- beam generate displacement in fluid media (medium), and material is polyethylene.
9. fluid media (medium) near wall frictional resistance data collection system as described in claim 1, which is characterized in that described three
A sub- system integration GPIB, VXI, TCP/IP, ActiveX standard communication protocol.
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| CN201910167651.2A CN109946013A (en) | 2019-03-05 | 2019-03-05 | Fluid media (medium) near wall frictional resistance data collection system based on optical sensor |
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| DE202004000428U1 (en) * | 2003-02-20 | 2004-10-21 | Wagner, Gerhard | Pressure monitor e.g. for control room, monitors pressures to 2000 Pa by diagonal tubing manometer and light barrier with electronic circuit operated battery and when adjusted pressure is exceeded optical and acoustic signal is produced |
| CN1884988A (en) * | 2005-06-24 | 2006-12-27 | 阿南·库马尔·贾殷 | A pressure indicating apparatus |
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