CN107891946B - The trigger signal that ship stern flow fields PIV is measured in wave is moved by ship from trigger device and measurement method - Google Patents
The trigger signal that ship stern flow fields PIV is measured in wave is moved by ship from trigger device and measurement method Download PDFInfo
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- CN107891946B CN107891946B CN201711078267.2A CN201711078267A CN107891946B CN 107891946 B CN107891946 B CN 107891946B CN 201711078267 A CN201711078267 A CN 201711078267A CN 107891946 B CN107891946 B CN 107891946B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B71/00—Designing vessels; Predicting their performance
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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
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/18—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance
- G01P5/20—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance using particles entrained by a fluid stream
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- Mechanical Engineering (AREA)
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- Length Measuring Devices By Optical Means (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The present invention provides the trigger signal of ship stern flow fields PIV measurement in wave a kind of by ship movement from trigger device and measurement method, computer is adjusted with signal including the acquisition of PIV data, laser sensor, PIV measuring system, laser signal receives and signal trigger flag plate, signal synchronizer, movement of ship model heaves bar and pitch angular shaft encoder, pitch angular shaft encoder is arranged on ship model, movement of ship model heaves bar and is arranged above pitch angular shaft encoder, laser signal is received with the setting of signal trigger flag plate on movement of ship model heave bar, signal triggering passage is formed when the laser light signal of laser transmitter projects passes through the silver color mark line on mark plate, trigger signal is sent to synchronizer, synchronizer receives by pitching and the signal of heave movement sending and triggers PIV flow field survey system, PI V measuring system starts to work and acquires picture.The present invention is to avoid artifactual epochs to trigger interference and movement position problem asynchronous with measurement position.
Description
Technical field
The trigger signal measured the present invention relates to ship stern flow fields PIV in a kind of wave moved from trigger device by ship and
Measurement method belongs to ship test flow field survey field.
Background technique
Ship is in the design process, extremely important about posture of the ship in wave and performance study.For research ship
Propulsive performance of the oceangoing ship in wave, it is necessary to measure the flow field velocity of propeller disk when ship navigates by water in wave.Pi Tuo
Three kinds measured with acquisition of pipe, LDV (Single-point velocity determination technology) and PIV (particle image velocimetry method) as current details flow field
Usual way, with the development of laser and image processing techniques, LDV gradually replaced with PIV treat flow measurement field have contact do
The Pitot tube disturbed.Spot measurement compared to LDV is obtained for carrying out the regions flow field survey PIV such as ship, propeller wake field
The extensive use of a large amount of scholars.Vehicle mounted type PIV system is also widely used in measurement ship model when navigating by water in towing basin
Flow field, however, traditional vehicle mounted type PIV system but cannot be using measurement ship model flow field change under the wave action.Therefore,
It is necessary to design a kind of trigger signal of measurement of the ship stern flow fields PIV suitable for wave to be moved by ship from trigger device.
PIV measures the trigger device of ship stern flow fields in wave proposed by the present invention, can measure ship in wave under heave movement
Tail flow field, provide effective measurement method for the measurement of ship stern flow fields in wave.
Summary of the invention
The purpose of the invention is to provide a kind of trigger signal of ship stern flow fields PIV measurement in wave to be moved by ship
From trigger device and measurement method.
The object of the present invention is achieved like this: the trigger signal that ship stern flow fields PIV is measured in wave is moved by ship
From trigger device, it is characterised in that: adjust computer with signal including the acquisition of PIV data, laser sensor, PIV measuring system, swash
Optical signal, which is received, heaves bar and pitch angular shaft encoder with signal trigger flag plate, signal synchronizer, movement of ship model, described vertical
Cradle angle degree shaft encoder is arranged on ship model, and the movement of ship model heave bar is arranged above pitch angular shaft encoder, described
Laser signal is received with the setting of signal trigger flag plate on movement of ship model heave bar, and laser signal receives and signal trigger flag
Plate is black background plate, and the silver color mark line of at least three rows is provided on black background plate, and the PIV measuring system includes
PIV laser and two cameras form signal triggering when the laser light signal of laser transmitter projects passes through silver color mark line
Access, trigger signal are sent to synchronizer, and synchronizer receives the signal issued by pitching and heave movement and triggering
PIV flow field survey system, the PIV laser of PIV measuring system and two cameras start to work and acquire picture.
The invention also includes structure features some in this way:
1. the trigger signal that ship stern flow fields PIV is measured in wave is moved the measurement method from trigger device, tool by ship
Body includes four-stage:
One, tests the preparation stage
(a) determine that the spacing of silver color mark line and pitch angular axis encode on mark plate according to the wave height of test wave operating condition
The characteristic angle of device；
(b) installation site of movement of ship model heave bar is determined according to the position in the ship of being measured section, when installation protects
Demonstrate,prove movement of ship model heave bar and horizontal plane；
(c) laser sensor, the acquisition of PIV data and signal adjustment computer, angle shaft encoder are connected with synchronizer respectively
It connects, so that silver color mark line is in wave crest, trough and laser sensor and constitute circuit and generate signal
Two, test adjustment stages
(a) trailer rests in pond middle section position, and progress is debugged without measuring system under the conditions of the speed of a ship or plane；
(b) trailer whistle, which is dispatched a car, makes wave indication signal, makes the corresponding wave operating condition of wave room laboratory technician progress and makes wave；
(c) wave is transferred to ship model position and interacts with model, and heave, pitching occur for ship, and respectively
Carry out pure heave movement state measurement debugging, the debugging of pure pitching state measurement and heave, pitching coupled motions debugging.
(d) check whether system circuit is unimpeded, and whether markings spacing and pitch axis encoder feature angle are correct；
Three, experimental stages
(a) test under the conditions of pure heave: wave maker manufactures wave, and ship model to be measured is fixed speed of a ship or plane traction boat by trailer
Row, wave and ship model interaction generate pure heave movement, and heave movement makes silver color markings and laser sensor constitute circuit
And excitation signal is emitted to synchronizer, synchronizer carries out signal processing and emits signal and be synchronized to the PIV of PIV measuring system to swash
Light device and two cameras, PIV laser emit laser sheet optical and simultaneously by two cameras to the figure in the region to be measured of ship model mutually into
Row shooting, record ship model to be measured in wave this moment position when PIV data；
(b) test under the conditions of pure pitching: the wave of wave maker manufacture and ship model to be measured interaction generate pure pitching,
Pitching reaches characteristic angle excitation pitching signal and transmits signals to synchronizer, synchronizer through pitch angular shaft encoder
It carries out signal processing and emits PIV laser and two cameras that signal is synchronized to PIV measuring system, the transmitting of PIV laser swashs
It mating plate light and is mutually shot by figure of two cameras to the region to be measured of ship model simultaneously, records in wave ship model to be measured position this moment
PIV data when setting；
(c) heave, pitching coupling condition test: wave maker manufacture wave and ship model to be measured interaction generate pitching and
Heave movement, pitching reach characteristic angle excitation pitching signal and transmit signals to synchronization through pitch angular shaft encoder
Device, heave movement make silver color markings and laser sensor composition circuit excitation signal be emitted to synchronizer, and synchronizer carries out coupling
It closes signal processing and emits and meet laser and two cameras that signal is synchronized to PIV measuring system jointly, PIV laser hair
Penetrate laser sheet optical and mutually shot by figure of two cameras to the region to be measured of ship model simultaneously, record in wave ship model to be measured this
Carve PIV data when position；
Four, experimental data processing stages
(a) carry out the flow field PIV data processing under pure heave, pure pitching and heave, pitching coupled motions respectively, and with phase
Wave peak-to-valley value and wave phase etc. is answered under Test Cycle to carry out position corresponding, ship stern flow fields transient state under formation wave condition,
Average, time, the flow fields such as averagely were for further ship and impeller design and optimization application.
Compared with prior art, the beneficial effects of the present invention are: the prior art is suitable for towing basin water there is no a set of
Lower PIV measuring system carries out having mating measurement method with ship stern flow fields measuring signal automatic initiating device under wave state.
The present invention is suitable for being carried out based on the underwater PIV measuring system of towing basin with ship stern flow fields measurement test under wave state,
It is risen in ship wave under PIV measuring system laser can be acted on from Image Acquisition camera by different wave operating conditions in test
Heavy, pitching independent triggers or coupling triggering.PIV measuring system can measure ship in wave after being triggered by Ship Motion Attitude
Pitching is risen in wave acts on the researchers such as lower wave crest, half wave crest, equilbrium position, half trough and trough
The arbitrary motion moment transient state that needs, time is average and the tail flow field of phase average, is the measurement of ship stern flow fields in wave
Effective PIV measuring signal automatic trigger and measurement method are provided, artifactual epochs is avoided and triggers interference and movement position
Problem asynchronous with measurement position.
Detailed description of the invention
Fig. 1 is that a kind of signal that underwater PIV ship wake field measurement is pulled suitable for wave by ship is moved automatic touching
Transmitting apparatus connect front view with system；
Fig. 2 is that PIV tail flow field measures quarter partial enlarged view in wave；
Fig. 3 be a kind of signal that underwater PIV ship wake field measurement is pulled suitable for wave by ship heave movement from
Driven triggering device partial enlarged view；
Fig. 4 be a kind of signal that underwater PIV ship wake field measurement is pulled suitable for wave by ship pitching from
Driven triggering device partial enlarged view；
Fig. 5 is that a kind of signal that underwater PIV ship wake field measurement is pulled suitable for wave by ship is moved automatic touching
Transmitting apparatus signal transmission figure；
In figure: the acquisition of 1.PIV data and signal adjustment computer, 2. signal synchronizers, 3. laser sensors, 4. mark plates,
5. laser light signal, the main bridge of 6. trailers, 7. heave bars, 8. waves, 9. ship models to be measured, 10.PIV laser, 11.PIV laser hair
Penetrate head, No. 12.1 PIV cameras, No. 13.2 PIV cameras, 14. laser sheet opticals, 15.PIV measuring system, 16. pitch angular axis coding
Device, 17. connecting plates, 18. hull fixed plates, 19.PIV camera shooting area, 20. mark plate black plate bodys, 21. mark plate silver color
Markings, 22. ship heave movements, 23. pitchings, 24. pitching locking devices.
Specific embodiment
Present invention is further described in detail with specific embodiment with reference to the accompanying drawing.
As shown in Fig. 1,2,3,4,5, the present invention include the acquisition of PIV data with signal adjust computer (1), one it is synchronous
Device (2), a laser sensor (3), a mark plate (4), a heave bar (7), a pitch angular shaft encoder (16)
With a set of PIV measuring system (15).The acquisition of PIV data is used to that pitch angular boat encoder is arranged with signal adjustment computer (1)
(16) on characteristic angle, heave bar (7) on mark plate (4) silver color mark line interval (21) calculating and PIV measuring system
(15) the data analysis and storage acquired.Synchronizer (2) carries out heave movement (22) automatic trigger signal, pitching (23) certainly
Dynamic trigger signal, PIV laser (10) signal are synchronous with PIV camera (12) (13) signal.Laser sensor (3), which is fixed on, to be dragged
Laser light signal (5) can be issued on car owner's bridge (6).Mark plate (4) is by mark plate black plate body (20) and mark plate silver color mark
Will line (21) composition.Pitch angular shaft encoder (16) is connected with connecting plate (17), connecting plate and ship model hull fixed plate (18)
Connection, pitching locking device (24) can lock pitching (23) and realize only heave movement (22) PIV flow field survey.PIV is surveyed
Amount system (15) includes PIV laser (10), laser beam emitting head (11) and camera (12) (13).The signal trigger device includes
Laser sensor and laser signal receive and signal trigger flag plate and movement of ship model heave bar and pitch angular shaft encoder.
Laser sensor is used to emit laser and transmits signals to PIV measuring system to mark plate and after signal forms access, heaves bar
It is fixed on ship tail portion, synchronous with ship that heave movement is carried out after by wave action, pitch angular shaft encoder is used to recording boat
Oceangoing ship pitch angular and by ship pitching automatic trigger signal to synchronizer.Mark plate is mounted on fook, for receiving
The laser light signal of laser transmitter projects.Mark plate uses black background, and being equipped with three or a plurality of on plate, (item number depends on measurement
Movement or time interval quantity) silver color mark line at equal intervals.The line of silver color is used to receive the optical signal of laser sensor transmission,
Signal triggering passage is formed when laser light signal passes through silver color mark line.Trigger signal is sent to synchronizer, and synchronizer connects
It receives the signal of pitching and heave movement sending and triggers PIV flow field survey system.PIV measures laser system and photograph is
System, which is started to work, acquires picture.The PIV ship wake field measurement test that the present invention is suitable for having under wave state, being capable of surveying vessel
Oceangoing ship rises the tail flow field under pitching in wave, provides effective measurement method for the measurement of ship stern flow fields in wave.
The triggering form of signal trigger device is to realize that triggering, wave parameter etc. change automatically by the heave of ship, pitching
Trigger device is moved by ship and is changed automatically after change, is adjusted without artificial.The triggering of signal trigger device can independently can coupling
Close, triggering mode is 1) wave make ship occur lifting movement, lifting movement acts on heave bar on, heave bar change in location
The laser of silver wire and trigger device is set to constitute access, the pulse laser and camera for triggering PIV system are started to work, and wave is recorded
Middle ship this moment position when PIV data.2) wave makes ship that pitching occur, and pitching acts on ship, makes ship
Angle change occurs for oceangoing ship pitch angular shaft encoder, and encoder records different angle moment encoded information, according to initially setting up spy
Assemble-publish code angle issue TTL signal, trigger PIV system pulse laser and camera start to work, record wave in ship this moment
PIV data when position.3) wave makes ship that heave, pitching occur.Heave movement acts on heave bar, shakes movement and makees
With on pitch angular shaft encoder.Heave bar change in location makes the laser of silver wire and trigger device constitute access, encoder
Record different angle moment encoded information.Heaving Signal trigger device and pitching signal trigger device signal are sent to synchronizer
Both on, synchronizer is synchronous according to initially setting up feature coding angle, carrying out coupling with the deep movement position of feature, meet
Issue TTL signal when common prescription, the pulse laser and camera for triggering PIV system are started to work, and record in wave ship this moment
PIV data when position.Installation site of the mark plate on heave bar meets, intermediate silver wire position and laser on mark plate
In the same horizontal line.It is vertical with horizontal position to heave bar, according to different measurement sections, may be arranged at shipping stempost, sternpost and
Ship center of gravity.The spacing of mark plate silver color markings can need to adjust with quantity according to measurement, with realize different measurement positions,
The measurement request in period.Pitch angular shaft encoder can carry out individual features according to wave parameter and ship seakeeping test
Angle setting, to realize the measurement request of different measurement positions, period.
(21) spacing of silver wire on mark plate and pitch angular shaft encoder were determined according to test wave height first before on-test
(16) mark plate (4) has then been fixed on a certain position on heave bar (7), further according to measured section by characteristic angle
Position determine installation site, when installation, pays attention to heaving bar (7) and horizontal plane.Then by laser sensor (3), PIV
Data acquisition is connect with signal adjustment computer (1), angle shaft encoder (16) and synchronizer (2), and regulating system setting makes silver wire
Circuit is constituted in wave crest, trough (when equilbrium position) and laser sensor and generates signal, in addition, pitch angular shaft encoder
Angle, which is at characteristic angle, also constitutes circuit generation signal.After the completion of system debug, experimental test is carried out.Wave maker manufactures wave
Unrestrained (8), ship model (9) to be measured is by the main bridge of trailer (6) to fix speed of a ship or plane towing voyage.Wave (8) and ship model (9) interaction generate
Pitching (23) and heave movement (22), pitching reach characteristic angle excitation pitching signal automatic trigger circuit and emit
For signal to synchronizer (2), it is synchronous that heave movement is emitted to markings (21) with laser sensor (3) composition circuit excitation signal
Device, synchronizer carry out coupled signal processing, transmitting meet jointly signal be synchronized to the lasers (10) of PIV measuring system (15) with
Camera (12) (13).Laser transmitting laser sheet optical (14) and simultaneously camera carry out region (19) figure to be measured and mutually shoot.Marking wave
In wave ship this moment position when PIV data.
The trigger signal that ship stern flow fields PIV is measured in wave is moved the measurement method from trigger device by ship, specifically
Including four-stage:
1. testing the preparation stage
(a) (21) spacing of silver wire on mark plate and pitch angular shaft encoder are determined according to the wave height of test wave operating condition
(16) characteristic angle；
(b) mark plate (4) is fixed on the corresponding position in heave bar (7), come really further according to the position in measured section
Surely the installation site of bar is heaved, when installation pays attention to heaving bar (7) and horizontal plane.
(c) by laser sensor (3), the acquisition of PIV data and signal adjustment computer (1), angle shaft encoder (16) and same
Device (2) connection is walked, regulating system setting makes silver wire be in wave crest, trough (when equilbrium position) and laser sensor and constitutes circuit
And signal is generated, in addition, pitch angular shaft encoder angle, which is at characteristic angle, also constitutes circuit generation signal.
2. the test adjustment stage
(a) trailer rests in pond middle section position, and progress is debugged without measuring system under the conditions of the speed of a ship or plane
(b) trailer whistle, which is dispatched a car, makes wave indication signal, makes the corresponding wave operating condition of wave room laboratory technician progress and makes wave.
(c) wave is transferred to ship model position and interacts with model, and heave, pitching occur for ship.Point
The debugging of pure heave movement (locking pitching) state measurement, pure pitching (locking heave movement) state measurement tune are not carried out
Examination and heave, pitching coupled motions debugging.
(d) check whether system circuit is unimpeded, and whether markings spacing and pitch axis encoder feature angle are correct.
3. experimental stage
(a) test under the conditions of pure heave: wave maker manufactures wave (8), and ship model (9) to be measured is fixed speed of a ship or plane traction by trailer
Navigation.Wave (8) and ship model (9) interaction generate pure heave movement (22), heave movement makes markings (21) and laser
Sensor (3) constitutes circuit excitation signal and is emitted to synchronizer, and synchronizer carries out signal processing, and transmitting signal is synchronized to PIV measurement
The laser (10) of system (15) and camera (12) (13).Laser emits laser sheet optical (14) and camera carries out area to be measured simultaneously
Domain (19) figure is mutually shot.Record wave in ship this moment position when PIV data.
(b) test under the conditions of pure pitching: wave maker manufactures wave (8), and ship model (9) to be measured is fixed speed of a ship or plane traction by trailer
Navigation.Wave (8) and ship model (9) interaction generate pure pitching (23) and move, and pitching reaches characteristic angle excitation pitching
Motor message automatic trigger circuit simultaneously transmits signals to synchronizer (2), and synchronizer carries out signal processing, and transmitting signal is synchronized to
The laser (10) of PIV measuring system (15) and camera (12) (13).Laser emit laser sheet optical (14) and simultaneously camera into
Row region (19) figure to be measured is mutually shot.Record wave in ship this moment position when PIV data.
(c) heave, the test of pitching coupling condition: wave maker manufactures wave (8), and ship model (9) to be measured is navigated by trailer with fixed
Fast towing voyage.Wave (8) and ship model (9) interaction generate pitching (23) and heave movement (22), and pitching reaches special
Sign angle excitation pitching signal automatic trigger circuit simultaneously transmits signals to synchronizer (2), and heave movement makes markings (21)
Circuit excitation signal is constituted with laser sensor (3) and is emitted to synchronizer, and synchronizer carries out coupled signal processing, emits common full
Sufficient signal is synchronized to laser (10) and camera (12) (13) of PIV measuring system (15).Laser emits laser sheet optical (14)
And region (19) figure to be measured of camera progress simultaneously is mutually shot.Record wave in ship this moment position when PIV data.
If (d) carrying out the PIV measurement under other wave operating conditions, the markings spacing tune of test preparation stage need to be only carried out
Section is adjusted with pitch angular shaft encoder characteristic angle.
4. the experimental data processing stage
(a) carry out the flow field PIV data processing under pure heave, pure pitching and heave, pitching coupled motions respectively, and with phase
Wave peak-to-valley value and wave phase etc. is answered under Test Cycle to carry out position corresponding, ship stern flow fields transient state under formation wave condition,
Average, time, the flow fields such as averagely were for further ship and impeller design and optimization application.
The principle of the present invention is:
In wave ship stern flow fields PIV measure trigger signal by ship move from trigger device be by laser sensor,
Synchronizer, mark plate, heave bar and pitch angular shaft encoder are constituted.Laser sensor is used to emit laser on heave bar
Mark plate simultaneously transmits signals to synchronizer after signal forms access, and heave bar is fixed on position section to be measured, synchronous with ship
Heave movement is carried out, wave makes ship that pitching occur, and mark plate is mounted on heave bar, for receiving laser sensor hair
The signal penetrated.Pitching acts on ship, makes ship pitch angular shaft encoder that angle change occur.Mark plate is using black
Color background is equipped with three equidistant silver color mark lines on plate.Installation site of the mark plate on heave bar meets, on mark plate
Intermediate silver wire position and laser in the same horizontal line.Wave makes ship that lifting movement occur, and lifting movement has acted on
It lies prostrate on bar, fook change in location makes the laser of silver wire and trigger device constitute access, while angular encoder record is different
Angle moment encoded information issues TTL signal according to feature coding angle is initially set up, and synchronizer receives heave and pitching
The signal instruction of triggering transmits a signal to PIV system, and the pulse laser and camera for triggering PIV system are started to work, and records wave
Middle ship this moment position when PIV data.
To sum up, the present invention is included that laser sensor, laser signal connect by ship movement automatic signal trigger device in wave
It receives and signal trigger flag plate, movement of ship model heave bar and pitch angular shaft encoder.Laser sensor is used to emit laser light
Signal, movement of ship model heave bar is fixed in ship, and progress heave movement synchronous with ship, pitch angular shaft encoder are used to
Record ship pitch angular and by ship pitching automatic trigger signal to synchronizer.Laser signal is received to be marked with signal triggering
Will plate is mounted on heave bar, for receiving the signal of laser transmitter projects.Mark plate uses black background, is equipped with three on plate
The equidistant silver color mark line of item.Silver color mark line is used to receive the laser light signal of laser sensing transmission, works as laser light signal
By forming signal triggering passage when silver color mark line, trigger signal is sent to synchronizer, and synchronizer is received by pitching
With heave movement issue signal and trigger PIV flow field survey system.PIV system excites two-chamber yttrium according to the signal received
Aluminium garnet PIV measures laser system and PIV camera system starts to work and acquires measured zone fine flow field picture.The present invention is suitable
For can measure with ship stern flow fields measurement test under wave state based on the underwater PIV measuring system of towing basin
Ship rises wave crest, half wave crest, equilbrium position, half trough and trough etc. under pitching effect in wave
Doing more physical exercises, moment transient state, time is average and the tail flow field of phase average, the measurement for ship stern flow fields in wave have provided
The PIV measuring signal automatic trigger and measurement method of effect avoid artifactual epochs and trigger interference and movement position and measurement position
Set asynchronous problem.
Claims (2)
1. the trigger signal that ship stern flow fields PIV is measured in wave is moved by ship from trigger device, it is characterised in that: including
The acquisition of PIV data receives and signal trigger flag with signal adjustment computer, laser sensor, PIV measuring system, laser signal
Plate, signal synchronizer, movement of ship model heave bar and pitch angular shaft encoder, the pitch angular shaft encoder are arranged in ship model
On, the movement of ship model heave bar is arranged above pitch angular shaft encoder, and the laser signal is received to be marked with signal triggering
The setting of will plate is on movement of ship model heave bar, and it is black background plate that laser signal, which is received with signal trigger flag plate, and black is carried on the back
The silver color mark line of at least three rows is provided on scape plate, the PIV measuring system includes PIV laser and two cameras, when sharp
The laser light signal of optical sensor transmitting forms signal triggering passage when passing through silver color mark line, and trigger signal is sent to synchronization
Device, synchronizer receive by pitching and the signal of heave movement sending and trigger PIV flow field survey system, PIV measurement system
The PIV laser of system and two cameras start to work and acquire picture.
2. the trigger signal that ship stern flow fields PIV is measured in wave is moved the measurement method from trigger device, feature by ship
Be: the device including claim 1 specifically includes four-stage:
One, tests the preparation stage
(a) spacing of silver color mark line and pitch angular shaft encoder on mark plate are determined according to the wave height of test wave operating condition
Characteristic angle；
(b) installation site of movement of ship model heave bar is determined according to the position in the ship of being measured section, when installation guarantees ship
Mould movement heave bar and horizontal plane；
(c) laser sensor, the acquisition of PIV data are connect with synchronizer respectively with signal adjustment computer, angle shaft encoder, is made
Silver color mark line is in wave crest, trough and laser sensor and constitutes circuit and generate signal
Two, test adjustment stages
(a) trailer rests in pond middle section position, and progress is debugged without measuring system under the conditions of the speed of a ship or plane；
(b) trailer whistle, which is dispatched a car, makes wave indication signal, makes the corresponding wave operating condition of wave room laboratory technician progress and makes wave；
(c) wave is transferred to ship model position and interacts with model, and heave, pitching occur for ship, and carry out respectively
Pure heave movement state measurement debugging, the debugging of pure pitching state measurement and heave, pitching coupled motions debugging；
(d) check whether system circuit is unimpeded, and whether markings spacing and pitch axis encoder feature angle are correct；
Three, experimental stages
(a) test under the conditions of pure heave: wave maker manufactures wave, and ship model to be measured is fixed speed of a ship or plane towing voyage, wave by trailer
Wave generates pure heave movement with ship model interaction, and heave movement makes silver color markings constitute circuit with laser sensor and will swash
Signalling is emitted to synchronizer, synchronizer carry out signal processing and emit signal be synchronized to the PIV laser of PIV measuring system with
Two cameras, PIV laser emit laser sheet optical and are mutually shot by figure of two cameras to the region to be measured of ship model simultaneously,
Record ship model to be measured in wave this moment position when PIV data；
(b) test under the conditions of pure pitching: the wave of wave maker manufacture and ship model to be measured interaction generate pure pitching, pitching
Movement reaches characteristic angle excitation pitching signal and transmits signals to synchronizer through pitch angular shaft encoder, and synchronizer carries out
Signal processing simultaneously emits PIV laser and two cameras that signal is synchronized to PIV measuring system, and PIV laser emits laser piece
Light and mutually shot by figure of two cameras to the region to be measured of ship model simultaneously, record in wave ship model to be measured this moment position when
PIV data；
(c) heave, the test of pitching coupling condition: the wave of wave maker manufacture and ship model to be measured interaction generate pitching and heave
Movement, pitching reach characteristic angle excitation pitching signal and transmit signals to synchronizer through pitch angular shaft encoder,
Heave movement makes silver color markings and laser sensor composition circuit excitation signal be emitted to synchronizer, and synchronizer carries out coupling letter
It number handles and emits and meet laser and two cameras that signal is synchronized to PIV measuring system jointly, PIV laser emits laser
It piece light and is mutually shot by figure of two cameras to the region to be measured of ship model simultaneously, records in wave ship model to be measured position this moment
When PIV data；
Four, experimental data processing stages
(a) flow field PIV data processing under pure heave, pure pitching and heave, pitching coupled motions is carried out respectively, and is surveyed with corresponding
Measure carry out position corresponding, the ship stern flow fields transient state, Xiang Ping under formation wave condition of wave peak-to-valley value and wave phase etc. under operating condition
, the time flow fields such as averagely are applied for further ship and impeller design and optimization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711078267.2A CN107891946B (en) | 2017-11-06 | 2017-11-06 | The trigger signal that ship stern flow fields PIV is measured in wave is moved by ship from trigger device and measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711078267.2A CN107891946B (en) | 2017-11-06 | 2017-11-06 | The trigger signal that ship stern flow fields PIV is measured in wave is moved by ship from trigger device and measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107891946A CN107891946A (en) | 2018-04-10 |
| CN107891946B true CN107891946B (en) | 2019-06-14 |
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| CN108860453B (en) * | 2018-06-22 | 2023-08-22 | 上海船舶运输科学研究所 | Ship traveling wave measurement system and method |
| CN109000882A (en) * | 2018-07-31 | 2018-12-14 | 哈尔滨工程大学 | A kind of reality waters flow field PIV measuring system and measurement method |
| CN111122115B (en) * | 2020-01-08 | 2022-06-17 | 哈尔滨工程大学 | Multi-plane SPIV experimental device |
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