CN107576283A - Determine that aircraft dabbles the method for angle indirectly by optical measurement parameter - Google Patents
Determine that aircraft dabbles the method for angle indirectly by optical measurement parameter Download PDFInfo
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- CN107576283A CN107576283A CN201710804703.3A CN201710804703A CN107576283A CN 107576283 A CN107576283 A CN 107576283A CN 201710804703 A CN201710804703 A CN 201710804703A CN 107576283 A CN107576283 A CN 107576283A
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Abstract
The invention belongs to experimental test technology, and in particular to determine that aircraft dabbles the method for angle indirectly by optical measurement parameter.The present invention gives a kind of trajectory angle optics that dabbles based on coordinate transform to determine method, specifically includes step 1：Geometrical relationship formula after establishing former coordinate system and changing between new coordinate system；Step 2：Camera is arranged on request in runway diagonally forward and both sides；Step 3：Water spray suppression test is carried out, and the positive visual angle and side view angle of the track that dabbled under new coordinate system are calculated by optical camera；Step 4：The coordinate system correlations relation established by step 1, the positive visual angle and side view angle of the track that dabbled under former coordinate are calculated indirectly.The present invention is solves the problems, such as that the track that dabbles is obtained in former complete machine water spray suppression test to be present, a kind of new method of testing of proposition.
Description
Technical field
The present invention is applied to complete machine water spray suppression test, determines that aircraft dabbles angle indirectly by optical measurements, to test
As a result judge provides foundation.
Background technology
Complete machine water spray suppression test is civil aircraft research and development and certification, the experiment subject of military secret identification sizing defined.Examination
Test after end to need to provide complete machine and dabble characteristic angle, include the positive visual angle and side view angle for the track that dabbles.What experiment was got splashes
Water angle can be contrasted with design calculated value, realize the check to Forecasting Methodology.
It is determined that the angle generally use measuring method progress that dabbles.Obtaining the most direct mode in positive visual angle is slided in aircraft
Row front sets up video camera shooting and obtained, and is influenceed photographic effect by distance and is difficult to ensure that, front shooting in addition can give flight
Safety belt carrys out hidden danger.If obtaining the angle by the way of aerophotography, approximate positive visual angle is on the one hand can only obtain, it is another
Aspect can also bring influence to flight safety.
The problem of existing for complete machine water spray suppression test angle determined above, it is proposed that between a kind of parameter by optical measurement
Determination method is connect, line translation is entered into by measuring coordinate system first, it is determined that the angle that dabbled after the conversion in coordinate system, in conjunction with coordinate system
Between transformation relation formula, the angle that dabbles before being converted indirectly in coordinate system, brought so as to effectively prevent conventional method
The problem of.
Present invention relates to including the angle that dabbles determine indirectly principle, measuring coordinate conversion, optical measuring apparatus cloth
Put.
The content of the invention
The purpose of this patent is：A kind of measuring method is designed, for determining that aircraft splashes in complete machine water spray suppression test indirectly
Water angle.
The technical scheme of this patent is：
By optical measurement parameter determine indirectly aircraft dabble angle method defined by original coordinate system, rotating coordinate system
Dabble angle-determining, original coordinate system of parameter transformation relation, the design of camera position placement scheme, rotating coordinate system dabbles angle
Determine that five parts form.
Step 1：Definition vector is X-axis, and the opposite direction of gravity is Y-axis, defines Z axis by lefft-hand rule, remembers three-dimensional straight
The trajectory that dabbles in angular coordinate system is OP, and the side view angle theta that dabbles is projected for OP in YOZ planes and the angle of Z axis, dabbles and faces
Angle γ is that OP is projected and the angle of X-axis in XOZ planes；
Step 2：Former coordinate system around vertical direction one angle ε of Y-axis rotate counterclockwise, and establish rotation before and after coordinate system
Between incidence relation between geometric angle, wherein X and Z are coordinate before conversion, and X ' and Z ' then sit for coordinate system new after rotation
Mark, ε is the anglec of rotation.
Meet relation before and after rotation between coordinate：
Cos ε x '=x+z ' sin ε (1)
Then have：X=x ' cos ε-z ' sin ε (2)
Next has：Z=x ' sin ε+z ' cos ε (3)
And vertical direction coordinate is constant before and after rotating, i.e.,：
Y=y ' (4)
Relation before and after rotation between coordinate system can be expressed as：
Step 3：In the both sides of runway, arrangement high-speed camera dabbles track for shooting, and video camera C3 is arranged in aircraft and entered
Water spot and course are respectively arranged video camera A1, B2 on the direction of ε angles in the pond both sides with direction vertical direction.
Step 4：Face γ ' and side in the track that dabbles after being rotated using video camera A1, B2 and C3 in coordinate system
View angle theta '；
Step 5：Using expressions below, the positive visual angle in the track that dabbles and side view angle before being rotated in coordinate system：
And the depression angle for the track that dabbled before rotation in coordinate system：
The advantages of this patent is：
A kind of indirect determination method by optical measurement parameter is proposed, line translation is entered into by measuring coordinate system first, really
The angle that dabbled in coordinate system is scheduled on after converting, in conjunction with the transformation relation formula between coordinate system, coordinate system before being converted indirectly
In the angle that dabbles, so as to effectively prevent the experiment safety problem and result of calculation accuracy problem that conventional method is brought.
Brief description of the drawings
Fig. 1 is track three-dimensional geometry signal and positive visual angle, side view angle and the depression angle definition figure of dabbling.
Fig. 2 is geometrical relationship schematic diagram before and after coordinate system rotation.
Fig. 3 is that water spray suppression test is used to determine the optics camera position view of angle of dabbling indirectly.
Embodiment
1) coordinate system anglec of rotation ε determination
Anglec of rotation ε is chosen with depending on actual conditions, in order to ensure image definition and image quality, front video camera
C3 should not be advisable with maximum distance no more than 500m too far, and video camera arrangement should not to experiment be normally carried out cause shadow
Ring, such as video camera A1 and B2 is not preferably less than 50m apart from the distance of runway centerline, as shown in Figure 1.In order to ensure three simultaneously
The image quality of camera, anglec of rotation ε maximums, which are chosen for 3~5 °, to be advisable, as shown in Figure 2.
2) determination of video camera A1, B2 lines and video camera C3 vertical line intersection points O
In order to guarantee to get the fully developed track that dabbles, intersection point O determination is chosen in the pond that dabbles as far as possible
Centre is located in the Central Line in the pond that dabbles close to aircraft water outlet side, as shown in Figure 3.
Claims (6)
1. determine that aircraft dabbles the method for angle indirectly by optical measurement parameter, it is characterised in that defined by original coordinate system,
Rotating coordinate system parameter transformation relation, camera position placement scheme design, rotating coordinate system dabbles angle-determining, original coordinates
It is the part of angle-determining five composition that dabbles.
2. method of testing as claimed in claim 1, it is characterised in that definition vector is X-axis, and the opposite direction of gravity is Y
Axle, Z axis is defined by lefft-hand rule, remember that the trajectory that dabbles in three-dimensional cartesian coordinate system is OP, the side view angle theta that dabbles is OP in YOZ
Projection and the angle of Z axis in plane, the positive visual angle γ that dabbles are that OP is projected and the angle of X-axis in XOZ planes.
3. method of testing as claimed in claim 1, it is characterised in that Y-axis rotate counterclockwise of the former coordinate system around vertical direction
One angle ε, and the incidence relation before and after rotation between coordinate system between geometric angle, wherein X and Z are established to be sat before conversion
Mark, X ' and Z ' are then coordinate system coordinate new after rotation, and ε is the anglec of rotation.Relation before and after rotation between coordinate system can be expressed as：
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4. method of testing as claimed in claim 1, it is characterised in that arrangement high-speed camera is used to shoot in the both sides of runway
Dabble track, and video camera C3 is arranged in aircraft place of entry and course on the direction of ε angles, in the water with direction vertical direction
Pond both sides are respectively arranged video camera A1, B2.
5. method of testing as claimed in claim 1, it is characterised in that after can obtaining rotation using video camera A1, B2 and C3
The track that dabbles in coordinate system face γ ' and side view angle theta '.
6. method of testing as claimed in claim 1, it is characterised in that using expressions below, before being rotated in coordinate system
The positive visual angle in the track that dabbles, side view angle and depression angle：
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| CN201710804703.3A CN107576283B (en) | 2017-09-08 | 2017-09-08 | Method for indirectly determining aircraft water splash angle by means of optical measurement parameters |
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| CN201710804703.3A CN107576283B (en) | 2017-09-08 | 2017-09-08 | Method for indirectly determining aircraft water splash angle by means of optical measurement parameters |
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| DE4220754A1 (en) * | 1992-06-24 | 1994-01-05 | Aeg Schienenfahrzeuge | Drive mechanism for railway locomotive - has labyrinth seal with oil drainage channels having smooth transition surface to oil grooves in seal ring |
| CN202227217U (en) * | 2011-08-24 | 2012-05-23 | 尹玉珍 | Road brick capable of preventing water from splashing on road |
| CN104670521A (en) * | 2013-12-02 | 2015-06-03 | 中国飞行试验研究院 | Transport aircraft inlet splash testing method |
| CN103954220A (en) * | 2014-05-06 | 2014-07-30 | 福建江夏学院 | Ship motion state digital image measuring method in bridge collision test |
| CN105203415A (en) * | 2015-10-15 | 2015-12-30 | 华北理工大学 | Automatic simulation impact force determination device for high-pressure water jet punching |
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| ESCURE, C: "Visualization of the impact of drops on a substrate in plasma spraying: Deposition and splashing modes", 《INTERNATIONAL THERMAL SPRAY CONFERENCE》 * |
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