CN107121287A - A kind of many seat in the plane principal and subordinate triggered synchro imaging methods of model turbine fluidised form observation - Google Patents
A kind of many seat in the plane principal and subordinate triggered synchro imaging methods of model turbine fluidised form observation Download PDFInfo
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- CN107121287A CN107121287A CN201710376465.0A CN201710376465A CN107121287A CN 107121287 A CN107121287 A CN 107121287A CN 201710376465 A CN201710376465 A CN 201710376465A CN 107121287 A CN107121287 A CN 107121287A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/64—Computer-aided capture of images, e.g. transfer from script file into camera, check of taken image quality, advice or proposal for image composition or decision on when to take image
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
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Abstract
The present invention discloses a kind of many seat in the plane principal and subordinate triggered synchro imaging methods of model turbine fluidised form observation, is related to hydraulic model test field.The present invention utilizes digital imaging apparatus frame rate program-controlled and external interface has the characteristics of triggerable input, output, the multimachine bit synchronization triggering imaging method that the main imaging device that computerizeds control sends the fluidised form of multiple key areas inside the exposure synchronous with main imaging device with stroboscopic light source of trigger signal control subordinate imaging device, and the next observation model hydraulic turbine simultaneously frequently synchronous with model turbine turn is adopted observing proposing first for model turbine multimachine bit stream state.The present invention is for the hydraulic performance optimization design of hydraulic, and the characteristic research of the microcosmic hydraulic phenomenon of runner and the research due to hydraulic turbine fault diagnosis caused by cavitation have outstanding directive significance entirely for model turbine runner inside.
Description
Technical field：
The present invention relates to a kind of stream for hydraulics such as mixed-flow model turbine, mixed-flow model pump turbines
The synchronous imaging method of field flow state observation.
Background technology：
At present, the synchronous fluidised form observation of model turbine uses light engine position observation mostly, and observation area or selection are in mould
At type outlet of rotary wheel, back side cavitation or draft tube vortex rope phenomenon to model runner blade outlet are observed；Or select
At model runner import, the front and back separation of flow or vortex tape phenomenon that waterside is entered to model runner blade are observed, seldom to mould
Type runner import and export carries out many seats in the plane and observed simultaneously, even if being observed sometimes using many seats in the plane, due to the imaging device of different seats in the plane
Stroboscopic light source exposure image is triggered with respective trigger signal, the triggering of trigger signal is along ununified clock, even if frequency
It is identical, but because the difference of phase causes different stroboscopic light sources within the same triggering cycle and non-concurrent flash of light, in addition frequently
Flash source is area source, and the stroboscopic light source range of exposures of different seats in the plane has overlapping region, and the light wave in overlapping region is mutually dry
Relate to form coherent light, ultimately result in some seats in the plane is imaged on re-expose in a triggering cycle, and the image collected is overlapping
It is fuzzy, it is impossible to realize the purpose of multimachine bit synchronization imaging.
With raising of the people in terms of hydraulic designed capacity and human-subject test, in the past for influence hydraulic turbine fortune
The cavitation phenomenon of row stability is only capable of carrying out indirect analysis by parameters such as the declines and pressure fluctuation of measurement efficiency that it is lured in the past
Because and produce position, develop rapidly in computer technology, automatization testing technique constantly progressive today, scholar starts to seek in the industry
Seek the method that some cavitation phenomenons therein are carried out with directly observation, qualitative analysis, as exported in runner bucket observe
Some cavitation phenomenons are extended directly in the middle part of leaf road due to cavitation source, it is impossible to obtained image from outlet, therefore can not accurately be sentenced
Disconnected cavitation phenomenon Producing reason is due to that unreasonable Airfoil Design or blade processing defect or other reasonses cause；It is low to shine
The maturation of number of degrees word synchronous imaging technology so that the waterpower of the interlobate leaf road inner flow passage of amount adjacent to model turbine runner
The observation of phenomenon is possibly realized, especially for the mixed-flow model turbine of middle higher specific speed, due to vane curvature relatively
Small, using the spliced imaging observation of multimachine bit image, such as seat in the plane selection is proper, and imaging angle sets proper, it might even be possible to obtain
The road import of model turbine runner blade to the full runner fluidised form image exported, still, stroboscopic light source between each seat in the plane and into
Cause light to interfere as equipment lacks unified SECO, imaging device re-expose and can not obtain clear effective
Image information, therefore, is solved the above problems in the urgent need to a kind of by the control method of unified sequential, so as to be model turbine
The full observation of runner fluidised form and the qualitative analysis of cavitation hydraulic phenomenon, or even because hydraulic turbine Analysis on Fault Diagnosis caused by cavitation is carried
For effective technical support.
The content of the invention：The technical problem to be solved in the present invention is in the processs of the test such as model turbine cavitation are carried out, to carry
For a kind of turn frequency synchronous, many seats in the plane of being controlled by computer program, fine definition, imaging frequency with model turbine runner
The digital fluidised form observation procedure of synchronous triggering.The technical scheme is that：A kind of multimachine of model turbine fluidised form observation
Position principal and subordinate's triggered synchro imaging method, it is characterized in that：
1) computer system is started；
2) regulation model turbine reaches the steady-working state under the fixed rotating speed to be observed；
3) using the tach signal of the computer data acquiring equipment collection model hydraulic turbine, and the "current" model hydraulic turbine is calculated
Turn frequency, specific method is as follows：
Assuming that the speed measuring fluted disc of the "current" model hydraulic turbine is N number of tooth, and when each tooth of fluted disc turns over speed probe, sensing
The counter that device is produced in a pulse signal, data acquisition equipment carries out frequency measurement to pulse, passes through data acquisition equipment
In internal clock frequencies calculate the rotational frequency f of fluted discn, and converse when the rotating speed of model turbine is n, model water
The frequency f that turns of turbine is：
Rev/min wherein rotating speed n unit is rpm, i.e.,
f、fnUnit be Hz,
The synchronization object of rotating machinery refers to the same whirler of the picture-taken frequency of same synchronization, i.e. digital imaging apparatus
The rotational frequency of tool is identical, therefore, and rotary speed information must be obtained before imaging is synchronized；
4) frequency is turned according to the model turbine calculated, master control camera trigger signal, tool is generated using computer program
Body method is as follows：
When being run under regulation model turbine to the rotating speed to be observed, due to the flow and tail water pressure of model turbine
Change, cause model turbine inlet edge of runner blade to produce the front and back separation of flow, model runner vortex tape, runner bucket and go out
Vortex rope phenomenon is produced at waterside generation cavitation, draft cone, was produced by clearly observing, gathering and recording above-mentioned phenomenon
Journey, is aided with the test parameters under current working and carries out the position of the analysis separation of flow, vortex tape, cavitation and the generation of vortex rope phenomenon and lure
Cause, can instruct the optimization design of hydraulic turbine model runner bucket blade profile, even help to progress prototype water turbine stable
Property analysis and fault diagnosis research；Due to the separation of flow, vortex tape, cavitation and vortex rope phenomenon not transfixion, but with turning
The rotation of wheel constantly rotates, and in order to clearly collect the image information of above-mentioned phenomenon generating process, the frequency of IMAQ must
Must be with turning frequently same or like, it is hereby achieved that the geo-stationary of wanted observation position or slowly varying image, i.e., so-called
" synchronization "；Make S1To turn frequency signal, as synchronous imaging method wants synchronous signal, S2Given for frequency by computer program
The trigger signal of the trigger signal of the fixed square wave form produced by main imaging device, as principal and subordinate triggering, trigger signal
Rising edge or trailing edge can as triggering edge, then this using rising edge as triggering along exemplified by explanation：The cycle for turning frequency signal is
T1, the cycle of trigger signal is T2, two signals initially differ Δ t, trigger signal when triggering the cycle for second with tach signal phase
Poor Δ t1, then Δ t1=Δ t+ (T1-T2), then the triggering in i-th of triggering cycle is along the moment that arrives, and the difference of two signals is Δ ti=
Δt+i×(T1-T2), (i is positive integer), as (j+1) × T1>i×|T1-T2|≥j×T1When (j is positive integer), then master control into
As equipment completes to observe model turbine runner jth coil imaging；
5) master control imaging device controls subordinate imaging device and stroboscopic light source to carry out IMAQ, tool by trigger signal
Body method is as follows：
When carrying out the observation of model turbine multimachine bit synchronization fluidised form, because observation position is different, master and slave imaging device is equal
Independent stroboscopic light source need to be each equipped with, the frequency that main imaging device gives according to computer program carries out IMAQ, simultaneously
Main imaging device produces the trigger signal S of said frequencies and initial phase2, and output this to subordinate imaging device and strobe light
Source, subordinate imaging device receives the trigger signal for carrying out autonomous imaging device, and image taking is carried out according to the frequency of trigger signal,
Stroboscopic light source receive come autonomous imaging device main trigger signal by main trigger signal when, synchronization flash coordinate it is master and slave into
As equipment completes synchronous exposure, due to electric signal in transmitting procedure medium velocity close to the light velocity, trigger signal can be ignored and be transmitted across
Delay in journey, then realize principal and subordinate's triggered synchro of main imaging device triggering control subordinate imaging device and stroboscopic light source into
Picture；Main imaging device includes having data with GigE Vision interface protocols, USB interface or IEEE1394 interface protocols
Output and the digital camera or digital camera of synchronous triggering output function, subordinate imaging device include having GigE
The number with data output and synchronous triggering input function of Vision interface protocols, USB interface or IEEE1394 interface protocols
Word formula camera or digital camera, stroboscopic light source include continuous exposure frequency-adjustable flash lamp with external trigger function or
Stroboscope；
6) master and slave imaging device by way of data output interface uses Digital Transmission by the data collected with picture
Form be real-time transmitted to computer, each width picture that computer is photographed with imaging device according to shooting time sequencing
For a frame, the image for respectively returning master and slave imaging device according to time order and function order synthesizes the video flowing matchmaker of general format
Body file is shown on computer picture output equipment in real time, when observing that the separation of flow, vortex tape, cavitation or vortex rope phenomenon occur
When, then manually by the video stream media file record of synthesis in the magnetic disk storage of computer；In the case where rotating speed is constant,
Simulated by changing the flow and tail water pressure of model turbine turbine runner blade enter between waterside, outlet edge, leaf road and
Fluidised form at draft cone, by adjusting observation angle and the position of master and slave imaging device, can be achieved to turn model turbine
Full leaf road observation of any runner from import to outlet is taken turns, the pictorial information collected and computer are synthesized picture by frame
Video stream media file can obtain the front and back separation of flow of model turbine inlet edge of runner blade, vortex tape, runner bucket goes out
Waterside back side cavitation, the overall process of draft cone vortex rope phenomenon formation, the position of appearance and form, so as to reach guidance model
The optimization design of turbine runner blade blade profile, lifting Turbine Cavitation Testing performance and stability and hydraulic turbine Analysis on Fault Diagnosis
Purpose.
The present invention no matter model turbine need observe important area in fluidised form whether occur the separation of flow, vortex tape, cavitation,
The phenomenon such as vortex rope or the separation of flow, as long as know the current working drag hydraulic turbine turns frequency information, can pass through computer program control
Make main imaging device send trigger signal triggering subordinate imaging device and stroboscopic light source with turn frequency progress a multimachine bit synchronization image adopt
Collection, while the information transmission collected is returned into computer by way of Digital Transmission carries out Video Composition, is obtained and model water
Turbine is real-time, many seat in the plane stringent synchronization, fine definition dynamic and static full runner image informations of fluidised form.
Fig. 1 is the eDRAM of synchronous triggering signal, and the cycle for turning frequency signal is T1, the cycle of trigger signal is
T2, two signals initially differ Δ t, and trigger signal differs Δ t with tach signal when triggering the cycle for second1, then Δ t1=Δ t+
(T1-T2), then the triggering in i-th of triggering cycle is along the moment that arrives, and the difference of two signals is Δ ti=Δ t+i × (T1-T2), (i is
Positive integer), as (j+1) × T1>i×|T1-T2|≥j×T1When (j is positive integer), then master control imaging device complete to model water
Turbine Runner jth coil imaging is observed；And work as T1-T2For timing, the image slowly rotated clockwise for model runner observed；
Work as T1-T2During to bear, the image slowly rotated counterclockwise for model runner observed works as T1-T2When being zero, what is observed is
The actionless image of model runner；
The many seat in the plane principals and subordinates triggering for the model turbine fluidised form observation that Fig. 2 controls for the typical computer for realizing the present invention
Formula synchronous imaging system principle diagram, it obtains model turbine by computer (1) and tachometric survey equipment (8) and turns frequency letter
Breath, is controlled by computer program by digital transmission interfaces (2) such as Ethernet, USB (USB) or IEEE1394
Main imaging device (3) produces multiple subordinates that model turbine region to be observed (7) are installed in synchronous Trig control signal (6) control
Imaging device (4) and stroboscopic light source (5) synchronize imaging, and the frame image information of shooting is led to again with digital transmission mode
Cross the digital transmission interfaces (2) such as Ethernet, USB (USB) or IEEE1394 and send back computer progress video in real time
Synthesis, display, record and the analysis of files in stream media.
The present invention is using digital imaging apparatus frame rate is program-controlled and its characteristics of triggerable input, output, first
Propose the triggering letter that the frequency is sent while adopting the main imaging device that computerizeds control according to program given frequency image
Number control subordinate imaging device is synchronous with main imaging device with stroboscopic light source exposes, and with model turbine turn frequently synchronously come simultaneously
The multimachine bit synchronization triggering imaging method of the fluidised form of multiple key areas inside the observation model hydraulic turbine.The present invention is in hydraulic turbine mould
Type is tested and Design of Hydraulic Turbine research field triggers simultaneous techniques using many seat in the plane principals and subordinates first, passes through computer acquisition to model
Rotational frequency information during hydraulic turbine operation, and control main imaging device to send out using computer program according to the size of rotational frequency
Go out synchronous triggering signal, triggering subordinate imaging device and stroboscopic light source and main imaging device are while exposure image, imaging frequency root
According to the fluidised form adjustment of key area inside desired model turbine, come realize many seat in the plane image taking speeds and turn frequency stringent synchronization into
Image space method.Full runner is microcosmic inside the hydraulic performance optimization design for being proposed for the hydraulic turbine of this method, model turbine runner
The characteristic research of hydraulic phenomenon and studying with outstanding directive significance due to hydraulic turbine fault diagnosis caused by cavitation.
Brief description of the drawings
Fig. 1 is the synchronous triggering signal eDRAM that the main imaging device that computer is controlled is sent
Fig. 2 is the typical principal and subordinate's triggered synchro imaging system theory diagram for realizing the present invention
Embodiment：
A kind of embodiment of many seat in the plane principal and subordinate triggered synchro imaging methods of model turbine fluidised form observation is pressed
Principle represented by Fig. 2：
1) computer system is started；
2) regulation model turbine reaches the steady-working state under the fixed rotating speed to be observed；
3) using the tach signal of the computer data acquiring equipment collection model hydraulic turbine, and the "current" model hydraulic turbine is calculated
Turn frequency, specific method is as follows：
Assuming that the speed measuring fluted disc of the "current" model hydraulic turbine is N number of tooth, and when each tooth of fluted disc turns over speed probe, sensing
The counter that device is produced in a pulse signal, data acquisition equipment carries out frequency measurement to pulse, passes through data acquisition equipment
In internal clock frequencies calculate the rotational frequency f of fluted discn, and converse when the rotating speed of model turbine is n, model water
The frequency f that turns of turbine is：
Rev/min wherein rotating speed n unit is rpm, i.e.,
f、fnUnit be Hz,
The synchronization object of rotating machinery refers to the same whirler of the picture-taken frequency of same synchronization, i.e. digital imaging apparatus
The rotational frequency of tool is identical, therefore, and rotary speed information must be obtained before imaging is synchronized；
4) frequency is turned according to the model turbine calculated, controls main imaging device machine generation to trigger using computer program
Signal, specific method is as follows：
When being run under regulation model turbine to the rotating speed to be observed, due to the flow and tail water pressure of model turbine
Change, cause model turbine inlet edge of runner blade to produce the front and back separation of flow, model runner vortex tape, runner bucket and go out
Vortex rope phenomenon is produced at waterside generation cavitation, draft cone, was produced by clearly observing, gathering and recording above-mentioned phenomenon
Journey, is aided with the test parameters under current working and carries out the position of the analysis separation of flow, vortex tape, cavitation and the generation of vortex rope phenomenon and lure
Cause, can instruct the optimization design of hydraulic turbine model runner bucket blade profile, even help to progress prototype water turbine stable
Property analysis and fault diagnosis research；Due to the separation of flow, vortex tape, cavitation and vortex rope phenomenon not transfixion, but with turning
The rotation of wheel constantly rotates, and in order to clearly collect the image information of above-mentioned phenomenon generating process, the frequency of IMAQ must
Must be with turning frequently same or like, it is hereby achieved that the geo-stationary of wanted observation position or slowly varying image, i.e., so-called
" synchronization "；Make S1To turn frequency signal, as synchronous imaging method wants synchronous signal, S2Given for frequency by computer program
The trigger signal of the trigger signal of the fixed square wave form produced by main imaging device, as principal and subordinate triggering, trigger signal
Rising edge or trailing edge can as triggering edge, then this using rising edge as triggering along exemplified by explanation：The cycle for turning frequency signal is
T1, the cycle of trigger signal is T2, two signals initially differ Δ t, trigger signal when triggering the cycle for second with tach signal phase
Poor Δ t1, then Δ t1=Δ t+ (T1-T2), then the triggering in i-th of triggering cycle is along the moment that arrives, and the difference of two signals is Δ ti=
Δt+i×(T1-T2), (i is positive integer), as (j+1) × T1>i×|T1-T2|≥j×T1When (j is positive integer), then master control into
As equipment completes to observe model turbine runner jth coil imaging；
5) master control imaging device controls subordinate imaging device and stroboscopic light source to carry out IMAQ, tool by trigger signal
Body method is as follows：
When carrying out the observation of model turbine multimachine bit synchronization fluidised form, because observation position is different, master and slave imaging device is equal
Independent stroboscopic light source need to be each equipped with, the frequency that main imaging device gives according to computer program carries out IMAQ, simultaneously
Main imaging device produces the trigger signal S of said frequencies and initial phase2, and output this to subordinate imaging device and strobe light
Source, subordinate imaging device receives the trigger signal for carrying out autonomous imaging device, and image taking is carried out according to the frequency of trigger signal,
Stroboscopic light source receive come autonomous imaging device main trigger signal by main trigger signal when, synchronization flash coordinate it is master and slave into
As equipment completes synchronous exposure, due to electric signal in transmitting procedure medium velocity close to the light velocity, trigger signal can be ignored and be transmitted across
Delay in journey, then realize principal and subordinate's triggered synchro of main imaging device triggering control subordinate imaging device and stroboscopic light source into
Picture；Main imaging device includes having data with GigE Vision interface protocols, USB interface or IEEE1394 interface protocols
Output and the digital camera or digital camera of synchronous triggering output function, subordinate imaging device include having GigE
The number with data output and synchronous triggering input function of Vision interface protocols, USB interface or IEEE1394 interface protocols
Word formula camera or digital camera, stroboscopic light source include continuous exposure frequency-adjustable flash lamp with external trigger function or
Stroboscope；
6) master and slave imaging device by way of data output interface uses Digital Transmission by the data collected with picture
Form be real-time transmitted to computer, each width picture that computer is photographed with imaging device according to shooting time sequencing
For a frame, the image for respectively returning master and slave imaging device according to time order and function order synthesizes the video flowing matchmaker of general format
Body file is shown on computer picture output equipment in real time, when observing that the separation of flow, vortex tape, cavitation or vortex rope phenomenon occur
When, then manually by the video stream media file record of synthesis in the magnetic disk storage of computer；In the case where rotating speed is constant,
Simulated by changing the flow and tail water pressure of model turbine turbine runner blade enter between waterside, outlet edge, leaf road and
Fluidised form at draft cone, by adjusting observation angle and the position of master and slave imaging device, can be achieved to turn model turbine
Full leaf road observation of any runner from import to outlet is taken turns, the pictorial information collected and computer are synthesized picture by frame
Video stream media file can obtain the front and back separation of flow of model turbine inlet edge of runner blade, vortex tape, runner bucket goes out
Waterside back side cavitation, the overall process of draft cone vortex rope phenomenon formation, the position of appearance and form, so as to reach guidance model
The optimization design of turbine runner blade blade profile, lifting Turbine Cavitation Testing performance and stability and hydraulic turbine Analysis on Fault Diagnosis
Purpose.
Claims (1)
1. a kind of many seat in the plane principal and subordinate triggered synchro imaging methods of model turbine fluidised form observation, it is characterized in that：
1) computer system is started；
2) regulation model turbine reaches the steady-working state under the fixed rotating speed to be observed；
3) using the tach signal of the computer data acquiring equipment collection model hydraulic turbine, and turning for the "current" model hydraulic turbine is calculated
Frequently, specific method is as follows：
Assuming that the speed measuring fluted disc of the "current" model hydraulic turbine is N number of tooth, and when each tooth of fluted disc turns over speed probe, sensor production
Counter in a raw pulse signal, data acquisition equipment carries out frequency measurement to pulse, by data acquisition equipment
Internal clock frequencies calculate the rotational frequency f of fluted discn, and converse when the rotating speed of model turbine is n, model turbine
The frequency f that turns be：
<mrow>
<mi>f</mi>
<mo>=</mo>
<mfrac>
<msub>
<mi>f</mi>
<mi>n</mi>
</msub>
<mi>N</mi>
</mfrac>
<mo>=</mo>
<mfrac>
<mi>n</mi>
<mn>60</mn>
</mfrac>
</mrow>
Rev/min wherein rotating speed n unit is rpm, i.e.,
f、fnUnit be Hz,
The synchronization object of rotating machinery refers to the picture-taken frequency of same synchronization, i.e. digital imaging apparatus with rotating machinery
Rotational frequency is identical, therefore, and rotary speed information must be obtained before imaging is synchronized；
4) frequency is turned according to the model turbine calculated, master control camera trigger signal, specific side is generated using computer program
Method is as follows：
When being run under regulation model turbine to the rotating speed to be observed, due to the flow of model turbine and changing for tail water pressure
Become, cause model turbine inlet edge of runner blade to produce the front and back separation of flow, model runner vortex tape, outlet edge of runner blade
Vortex rope phenomenon is produced at generation cavitation, draft cone, process is produced by clearly observing, gathering and recording above-mentioned phenomenon,
It is aided with the test parameters under current working and carries out position and the inducement that the analysis separation of flow, vortex tape, cavitation and vortex rope phenomenon are produced, can
To instruct the optimization design of hydraulic turbine model runner bucket blade profile, even help to carry out prototype water turbine operation stability analysis
And the research of fault diagnosis；Due to the separation of flow, vortex tape, cavitation and vortex rope phenomenon not transfixion, but turning with runner
Dynamic constantly rotation, in order to clearly collect the image information that overall process occurs for above-mentioned phenomenon, the frequency of IMAQ must be with
Turn frequency same or like, it is hereby achieved that the geo-stationary of wanted observation position or slowly varying image, i.e., so-called " same
Step "；Make S1To turn frequency signal, as synchronous imaging method wants synchronous signal, S2For frequency by computer program give by
The trigger signal of the trigger signal for the square wave form that main imaging device is produced, as principal and subordinate triggering, the rising edge of trigger signal
Or trailing edge can as triggering edge, herein using rising edge as triggering along exemplified by explanation：The cycle for turning frequency signal is T1, triggering
The cycle of signal is T2, two signals initially differ △ t, and trigger signal differs △ t with tach signal when triggering the cycle for second1,
Then △ t1=△ t+ (T1-T2), then the triggering in i-th of triggering cycle is along the moment that arrives, and the phase difference of two signals is △ ti=△ t+
i×(T1-T2), i is positive integer), as (j+1) × T1>i×|T1-T2|≥j×T1When j be positive integer, then master control imaging device is complete
Paired model turbine runner jth coil imaging observation；
5) master control imaging device controls subordinate imaging device and stroboscopic light source to carry out IMAQ, specific side by trigger signal
Method is as follows：
When carrying out the observation of model turbine multimachine bit synchronization fluidised form, because observation position is different, master and slave imaging device is both needed to respectively
From independent stroboscopic light source is equipped with, the frequency that main imaging device gives according to computer program carries out IMAQ, at the same it is main into
As equipment produces the trigger signal S of said frequencies and initial phase2, and output this to subordinate imaging device and stroboscopic light source,
Subordinate imaging device receives the trigger signal for carrying out autonomous imaging device, and image taking, frequency are carried out according to the frequency of trigger signal
Flash source is when receiving the main trigger signal for carrying out autonomous imaging device by main trigger signal, and synchronization flash coordinates master and slave imaging
Equipment completes synchronous exposure, due to electric signal in transmitting procedure medium velocity close to the light velocity, can ignore trigger signal transmitting procedure
In delay, then realize principal and subordinate's triggered synchro imaging of main imaging device triggering control subordinate imaging device and stroboscopic light source；
Main imaging device includes having data output with GigE Vision interface protocols, USB interface or IEEE1394 interface protocols
With the digital camera or digital camera of synchronous triggering output function, subordinate imaging device includes that there is GigE Vision to connect
The digital camera with data output and synchronous triggering input function of mouth agreement, USB interface or IEEE1394 interface protocols
Or digital camera, stroboscopic light source includes the flash lamp or stroboscope with external trigger function of continuous exposure frequency-adjustable；
6) master and slave imaging device by way of data output interface uses Digital Transmission by the data collected with the shape of picture
Formula is real-time transmitted to computer according to shooting time sequencing, and each width picture that computer is photographed using imaging device is one
Frame, the image for respectively returning master and slave imaging device according to time order and function order synthesizes the video stream media text of general format
Part is shown on computer picture output equipment in real time, when observing that the separation of flow, vortex tape, cavitation or vortex rope phenomenon occur, then
Manually by the video stream media file record of synthesis in the magnetic disk storage of computer；In the case where rotating speed is constant, pass through
The flow and tail water pressure for changing model turbine enter between waterside, outlet edge, leaf road and tail water to simulate turbine runner blade
Fluidised form at pipe Taper Pipe, by adjusting observation angle and the position of master and slave imaging device, can be achieved to appoint model turbine runner
Full leaf road observation of the meaning runner from import to outlet, by the pictorial information collected and computer by picture by regarding that frame is synthesized
Frequency files in stream media can obtain the front and back separation of flow of model turbine inlet edge of runner blade, vortex tape, outlet edge of runner blade
Back side cavitation, the overall process of draft cone vortex rope phenomenon formation.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110798675A (en) * | 2019-12-16 | 2020-02-14 | 宁波为森智能传感技术有限公司 | Camera module |
| CN116567402A (en) * | 2023-06-28 | 2023-08-08 | 东莞锐视光电科技有限公司 | Light source controller trigger delay control method and system |
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