CN109085385B - PIV target disc-based calibration multidirectional adjustment auxiliary disc and testing method thereof - Google Patents
PIV target disc-based calibration multidirectional adjustment auxiliary disc and testing method thereof Download PDFInfo
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- CN109085385B CN109085385B CN201811242751.9A CN201811242751A CN109085385B CN 109085385 B CN109085385 B CN 109085385B CN 201811242751 A CN201811242751 A CN 201811242751A CN 109085385 B CN109085385 B CN 109085385B
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- 238000012360 testing method Methods 0.000 title abstract description 6
- 238000002474 experimental method Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- 238000000917 particle-image velocimetry Methods 0.000 description 20
- 238000005259 measurement Methods 0.000 description 9
- 238000013461 design Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
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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
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
- G01P21/02—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers
- G01P21/025—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers for measuring speed of fluids; for measuring speed of bodies relative to fluids
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Abstract
The invention discloses a PIV target disc-based calibration multidirectional adjustment auxiliary disc and a testing method thereof; the adjusting auxiliary disc comprises a horizontal disc and a vertical disc, wherein target disc holes are formed in the horizontal disc and the vertical disc, the horizontal disc is connected with the vertical disc in a 90-degree included angle mode, a level gauge is connected to the horizontal disc, slide way through holes with opposite positions are formed in the edges of the left side and the right side of the horizontal disc, and slidable screws are arranged in the slide way through holes. The testing method comprises the following steps: s1, fixing a target disc at the upper end of a horizontal disc or the back of a vertical disc; s2, establishing a three-dimensional coordinate system on the horizontal disc; s3, clamping the horizontal disc by using a bracket, and adjusting the horizontal disc to be in a horizontal state; s4, pulling out the first tape measure or the second tape measure; roughly determining a camera placing position through a tape measure scale; s5, hanging weight lines on the screws, and enabling the two weight lines to coincide; s6, fine tuning is carried out on the mobile camera; and S7, after the target disc completely enters the display window of the computer, the calibration operation is completed.
Description
Technical Field
The invention relates to the field of particle velocity measurement, in particular to a multidirectional adjustment auxiliary disc based on PIV target disc calibration and a testing method thereof.
Background
Compared with the traditional speed measuring technology, the PIV speed measuring technology (Particle Image Velocimetry) breaks through a plurality of limitations, and is a very promising interference-free regional speed measuring technology. Here, the calibration of the target disc is a very important thing, and it is to calculate the corresponding relation between a pixel point and the actual displacement through the relation between the projection distance searching and the actual distance of the particle displacement on the CCD camera. The three-dimensional particle velocimeter is also used by tracking the path Deltal of the particle in the region of the target diskTime Deltat ratio according toThe speed was calculated. X, Y, Z, and so on. The data of pressure field, vorticity field and the like can be processed by the software self-contained formula according to the speed field. When measuring flow rates in a three-dimensional flow field using PIV, it is necessary to first select an area through a target disk, and take a photograph of the area using a CCD camera or the like. The flow velocity distribution is carried out in the three-dimensional flow field by using the equipment such as a wind tunnel or a blower as an external force source for pushing the flow field to move including trace particles, and selecting missing particles which have the same specific gravity as the fluid and good following property and light scattering property.
When measuring the flow velocity inside the fluid or passing through the rear of a certain obstacle, a laser or other equipment is often required to emit a sheet light source to illuminate the area to be measured of the target disc, and a very time-consuming fine work is required to enable the area of the target disc to be quickly overlapped with the square area shot by the CCD camera or other equipment and the sheet light source to accurately stay on the target disc. How to save time and accurately leave the light source in the area to be measured is a key of the problem.
In the calibration process of the target disc, the CCD camera is used as a shooting instrument, and the coordinates of the region to be detected in space are essentially imported into the camera and system software through analysis of a mapping function equation set. Therefore, the accuracy of the calibration directly affects the accuracy of the resolution. The light sheets uniformly illuminate the target disc in parallel and are perpendicular to a plane formed by the optical axis of the camera. The distance deviation between the camera and the target disc is also one of the errors in the calibration process. Therefore, the fact that the target disk and the sheet light source are strictly coplanar is a difficult and critical point of the technology. The cross on the target disc is strictly controlled near the center of the shooting area of the CCD camera, when the target disc is calibrated in a three-dimensional space, the actual moving distance of the target disc and the moving distance of a picture displayed on a computer through the CCD camera are far from each other, and the calibration is time-consuming mostly because the target disc cannot be aligned with the edge of a few millimeters of the shooting area displayed in computer software through the CCD camera or the edge inclination of the target disc is not overlapped with a computer display shooting window.
The auxiliary instrument at the present stage can not adjust the upper, lower, left, right, front and rear directions of the target disk in the three-dimensional space simultaneously in the PIV target disk calibration process, and can not measure the distance between the CCD camera and the target disk.
In actual photographing, there are not only horizontally placed photographing of the CCD camera and the target disc, but also photographing in the vertical direction of the target disc and the CCD camera. At present, few tripod brackets which are specially used in PIV experiments and are used for installing target discs are expensive, and the problems that the level of an XY plane is only solved, skew cannot be solved and the like are solved. In most cases, the bracket used is replaced by a bracket of a common single-lens reflex camera. When changing the calibration direction, need dismantle the tripod axis of rotation and change the direction, both consuming time, troublesome again, repeated installation dismantlement can reduce the life of tripod, has brought very big inconvenience for PIV target disk calibration operation.
Disclosure of Invention
The invention aims to solve the problems, and designs the auxiliary disk for calibrating the PIV target disk in multiple directions and a testing method thereof, which are simple in structure and convenient to use.
In order to achieve the above object, the technical scheme of the present invention is as follows:
the utility model provides a mark multi-direction regulation auxiliary disc based on PIV target disc, the regulation auxiliary disc includes horizontal disc, vertical dish, all is provided with the target disc hole on horizontal disc, the vertical dish, and the horizontal disc is 90 degrees contained angles with vertical dish and is connected, is connected with the spirit level on the horizontal disc, and horizontal disc left and right both sides edge is provided with the slide through-hole that the position is relative, is provided with in the slide through-hole and can be at the interior gliding screw of slide through-hole.
Further, the horizontal disc comprises a first upper cover plate and a first lower bottom plate with a groove, the first upper cover plate covers the upper end of the first lower bottom plate, and a first tape measure is arranged in the groove of the first lower bottom plate; the vertical disc comprises a second upper cover plate and a second lower bottom plate with a groove, the second upper cover plate is connected to the rear end of the second lower bottom plate, and a second tape measure is arranged in the groove of the second lower bottom plate.
Further, the number of the target disc holes is 4, and the target disc holes are arranged in parallel in pairs.
Further, two first tape measures are arranged and are respectively coaxially arranged with the two side-by-side target disc holes; the two second tape measures are coaxially arranged with the two side-by-side target disc holes respectively.
Further, the level gauge is at least two, wherein at least one side wall of the front end of the horizontal disc is provided, and at least one side wall of the two sides of the horizontal disc is provided.
Furthermore, the outer side walls of the horizontal disc and/or the vertical disc are detachably connected with a weight instrument.
Further, there are at least two weight instruments.
Further, the number of the screws is 4, two screws are fixed at one end of the slideway through hole and are symmetrically arranged, and the other two screws are arranged in the slideway through hole and are in sliding connection with the slideway through hole.
A test method for calibrating a multidirectional adjustment auxiliary disc based on an PIV target disc comprises the following steps:
s1, fixedly connecting a target disc to the upper end of a horizontal disc or the back of a vertical disc through a target disc hole; fixedly connecting the target disc to the upper end of the horizontal disc when horizontal calibration is carried out, and fixedly connecting the target disc to the back of the vertical disc when vertical calibration is carried out;
s2, taking the central position of the front end edge of the horizontal disc as an origin, taking the right side as the X positive direction, taking the vertical inward direction as the Y direction and taking the vertical upward direction as the Z direction, and establishing a three-dimensional coordinate system;
s3, clamping the horizontal disc by using a bracket, and enabling the level gauges on the side wall at the front end and the side walls at the two sides of the horizontal disc to be kept in a horizontal state by adjusting the horizontal disc;
s4, pulling out the first tape measure in the horizontal disc or the second tape measure in the vertical disc; horizontally pulling out the first tape measure when the horizontal calibration is performed, and vertically pulling out the second tape measure when the vertical calibration is performed; according to the distance between the camera and the target disc determined in the past experiment, roughly determining the placement position of the camera through the scale of the tape measure;
s5, hanging weight lines on screws on the left side and the right side of the horizontal plate respectively, and sliding the screws to two ends of a slideway through hole or below the edge of the target plate; sliding the screw below the edge of the target disk when performing horizontal calibration, and sliding the screw to two ends of the slideway through hole when performing vertical calibration; adjusting the horizontal disc to enable the two heavy hammer lines to coincide when the two heavy hammer lines are seen from the Y-axis direction;
s6, observing whether the target disc is completely placed in a display window or not in an area picture to be detected in the computer, and performing fine adjustment by horizontally moving the camera;
s7, after the target disc is completely placed in the display window through the picture of the area to be measured in the computer, measuring the distance between the camera and the target disc through the first tape measure or the second tape measure, and completing the calibration operation.
Compared with the prior art, the invention has the advantages and positive effects that:
according to the invention, through the design that the horizontal disc and the vertical disc are connected at an included angle of 90 degrees, no matter in horizontal calibration or vertical calibration, the fixed state of the horizontal disc is properly adjusted, and the vertical disc perpendicular to the horizontal disc can reach the standard state, so that the target disc fixed on the horizontal disc or the vertical disc can quickly reach the PIV measurement requirement state; the design that the horizontal disc side wall is provided with the level gauge and the screw which can slide in the slideway through hole is adopted, and the combination of the screw and the weight gauge can detect the inclined state of the horizontal disc, so that an operator can quickly adjust the horizontal disc to a standard state, the situation that a target disc fixed on the horizontal disc or the vertical disc does not meet PIV measurement requirements due to the inclination of the horizontal disc is avoided, and the practicability of the invention is increased; on the other hand, the invention has simple operation, easily understood principle, convenience, high efficiency and low cost, is simultaneously suitable for the horizontal calibration and the vertical calibration of the target disc in PIV measurement, can quickly coincide the three-dimensional space position of the target disc with the shooting area of the CCD camera and the size of a window regulated in a computer in the actual application process, avoids the occurrence of the situation that the window of the computer and the shooting area of the CCD camera incline, and can help the CCD camera to quickly find the space position corresponding to the target disc through the design of the first tape or the second tape; and the distance between the CCD camera and the target disc is measured and recorded, so that the next calibration and measurement work can be conveniently and rapidly performed, and great convenience is brought to the calibration operation of the PIV target disc.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a second embodiment of the present invention;
fig. 3 is a connection structure diagram of the first lower base plate.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, modifications, equivalents, improvements, etc., which are apparent to those skilled in the art without the benefit of this disclosure, are intended to be included within the scope of this invention.
As shown in fig. 1, 2 and 3, a multidirectional adjustment auxiliary disc based on PIV target disc calibration comprises a horizontal disc and a vertical disc, wherein 4 target disc holes 8, 9, 11 and 14 are formed in the upper end of the horizontal disc; 4 target plate holes 20, 21, 24 and 26 are formed in the vertical plate; the holes of the target disc are arranged in parallel, the horizontal disc and the vertical disc are connected at an included angle of 90 degrees, and the side wall of the horizontal disc is connected with level gauges 3, 17 and 23; the side wall of the vertical disc is connected with the level gauges 1, 25 and 28; slide way through holes 4 and 32 which are opposite in position are formed in the left side edge and the right side edge of the horizontal disc, and screws 6, 7, 12 and 13 which can slide in the slide way through holes are arranged in the slide way through holes; the outer side wall of the horizontal disc is detachably connected with weight instruments 5 and 22.
The horizontal disc comprises a first upper cover plate 10 and a first lower bottom plate 15 with a groove, the first upper cover plate 10 covers the upper end of the first lower bottom plate 15, and first measuring tapes 30 and 31 are arranged in the groove of the first lower bottom plate 15; the first tape is horizontally pulled out from the horizontal disc through the tape through grooves 16 and 18 positioned on the first lower bottom plate, the vertical disc comprises a second upper cover plate 2 and a second lower bottom plate 19 with a groove, the second upper cover plate 2 is connected to the rear end of the second lower bottom plate 19, a second tape is arranged in the groove of the second lower bottom plate 19, and the second tape is vertically pulled out from the vertical disc through the tape through grooves 27 and 29 positioned on the second lower bottom plate; the first tape measure and the second tape measure are both arranged coaxially with the target disc aperture, e.g. the first tape measure 30 is coaxial with the target disc aperture 8 and the first tape measure 31 is coaxial with the target disc aperture 11.
According to the right hand coordinate system, the level 17 of fig. 1 is taken as an origin, the right side is in the positive direction X, the direction vertical to the paper surface is in the Y direction, and the vertical direction is in the Z direction. When the horizontal calibration is used, firstly, the left side of the negative X direction, namely the level meter 17 is clamped by the bracket, and meanwhile, the two level meters 3 and 17 are observed to ensure whether the XY plane is horizontal, namely whether the target disc is inclined or not in the front, back, left and right directions, under the condition that the level meters 3, 17 and 23 are parallel, according to the principle that the direction of gravity is vertical downwards, the screw 6 and the screw 12 hung with the weight meter are slid to the position right below the two edges of the target disc, and whether the target disc is inclined in the horizontal direction can be judged by judging whether two thin lines straightened by the weight meter are overlapped or not when seen from the Y axis direction. And then adjusted to the proper position.
In the vertical calibration, the support clamps the position near the level 17, the target plate is mounted on the back of the vertical plate (i.e. the side not covered by the upper horizontal plate) through the target plate holes 20, 21, 24, 26, and the target plate position is satisfactory as long as the horizontal auxiliary plate is horizontal and the heavy hammer lines under the two screws are coincident when viewed from the Y-axis direction because the horizontal auxiliary plate and the vertical auxiliary plate are at the same angle of 90 degrees.
According to the invention, through the design that the horizontal disc and the vertical disc are connected at an included angle of 90 degrees, no matter in horizontal calibration or vertical calibration, the fixed state of the horizontal disc is properly adjusted, and the vertical disc perpendicular to the horizontal disc can reach the standard state, so that the target disc fixed on the horizontal disc or the vertical disc can quickly reach the PIV measurement requirement state; the design that the horizontal disc is provided with the level gauge and the screw capable of sliding in the slideway through hole enables an operator to rapidly adjust the horizontal disc to a standard state, so that the situation that a target disc fixed on the horizontal disc or the vertical disc does not meet PIV measurement requirements due to inclination of the horizontal disc is avoided, and the practicability of the invention is increased; on the other hand, the invention has simple operation, easily understood principle, convenience, high efficiency and low cost, is simultaneously suitable for the horizontal calibration and the vertical calibration of the target disc in PIV measurement, can quickly coincide the three-dimensional space position of the target disc with the shooting area of the CCD camera and the size of a window regulated in a computer in the actual application process, avoids the occurrence of the situation that the window of the computer and the shooting area of the CCD camera incline, and can help the CCD camera to quickly find the space position corresponding to the target disc through the design of the first tape or the second tape; and the distance between the CCD camera and the target disc is measured and recorded, so that the next calibration and measurement work can be conveniently and rapidly performed, and great convenience is brought to the calibration operation of the PIV target disc.
Test method
The method combined with the auxiliary disk when the CCD camera is used for carrying out horizontal direction calibration on the target disk to-be-measured area comprises the following operation steps:
firstly, fixing the target disc at four target disc hole positions on a horizontal disc, taking a level 17 of fig. 1 as an origin according to a right-hand coordinate system, wherein the right side is in an X positive direction, the vertical paper surface is in a Y direction, and the vertical direction is in a Z direction. The negative X-direction, i.e. the left side of the level 17, is first clamped with the bracket.
Then, it is observed whether the two levels 3, 17 are horizontal or not to ensure whether the XY plane is horizontal or not in the three-dimensional coordinate system. The step is to eliminate whether the target disc is tilted or not.
The two first tape measures in the disc are pulled out horizontally to determine the approximate mounting height of the CCD camera. The distance between the camera and the target disc is determined according to the past experimental experience, and the position is approximately set by measuring tape graduations. When the camera is used, the camera and the target disc are required to be placed on the support to adjust the height, and the distance between the camera and the target disc is generally 50-90CM, so that after the target disc with the auxiliary disc is placed on the support, two first tape measures are pulled out to form a plane, and the camera and the target disc are approximately determined to be at the same height.
The weight instruments on the two sides are taken down, hung by wires and placed under the two screws respectively, and slid to the positions right under the two edges of the target disk. And whether the two heavy hammer lines are coincident or not is seen from the Y-axis direction. This step eliminates the front-to-back skew problem of the target disk after it is placed horizontally in the XY plane.
Finally, observing whether the target disc is completely placed in a display window or not in the picture of the area to be detected in the computer, and performing fine adjustment by horizontally moving the CCD camera.
After the target disc is completely placed in the display window by the picture of the area to be measured in the computer, the distance between the camera and the target disc is measured by the first tape measure, and then the calibration is completed.
The operation steps when the CCD camera is used for calibrating the vertical direction in the region to be tested of the target disc are as follows:
first, the target plate is mounted on the back of the vertical plate (i.e., the side not covered by the upper horizontal plate) through the target plate holes 20, 21, 24, 26, and the level 17 of fig. 1 is taken as the origin according to the right-hand coordinate system, the right side is the positive X direction, the inward direction of the vertical paper is the Y direction, and the vertical upward direction is the Z direction. The position near level 17 is first clamped with a bracket.
Then, it is observed whether the two levels 3, 17 are horizontal or not to ensure whether the XY plane is horizontal or not in the three-dimensional coordinate system. The step is to eliminate whether the target disc is tilted or not.
And pulling out the two second tape measures in the disc from the vertical disc to determine the approximate placement position of the CCD camera in the vertical direction. The distance between the CCD camera and the target disc is determined according to the past experimental experience, and the approximate placing height is determined through the measuring tape graduation.
Finally, taking down the heavy hammer instruments on two sides, hanging the heavy hammer instruments under the screws respectively by wires, and sliding the screws to the two ends of the slideway through hole or fixing the heavy hammer instruments at the two ends of the slideway through hole; and (3) whether the two heavy hammer lines coincide or not is seen from the Y-axis direction. This step eliminates the front-to-back skew problem of the target disk after it is placed horizontally in the XY plane.
At this time, whether the target disc is completely placed in the display window or not is observed in the picture of the area to be detected in the computer, and fine adjustment is performed by horizontally and vertically moving the CCD camera.
After the target disc is completely placed in the display window by the picture of the area to be measured in the computer, the distance between the camera and the target disc is measured by the second tape measure, and then the calibration is completed.
Claims (6)
1. Multidirectional regulation auxiliary disc is markd based on PIV target disc, its characterized in that: the adjusting auxiliary disc comprises a horizontal disc and a vertical disc, wherein target disc holes are formed in the horizontal disc and the vertical disc, the horizontal disc is connected with the vertical disc at an included angle of 90 degrees, a level gauge is connected to the horizontal disc, slide way through holes with opposite positions are formed in the edges of the left side and the right side of the horizontal disc, and screws capable of sliding in the slide way through holes are arranged in the slide way through holes;
the horizontal disc comprises a first upper cover plate and a first lower bottom plate with a groove, the first upper cover plate covers the upper end of the first lower bottom plate, and a first tape measure is arranged in the groove of the first lower bottom plate; the vertical disc comprises a second upper cover plate and a second lower bottom plate with a groove, the second upper cover plate is connected to the rear end of the second lower bottom plate, and a second tape measure is arranged in the groove of the second lower bottom plate;
the two first tape measures are coaxially arranged with the two side-by-side target disc holes respectively; the two second tape measures are coaxially arranged with the two side-by-side target disc holes respectively;
and the outer side walls of the horizontal disc and/or the vertical disc are detachably connected with a weight instrument.
2. The PIV-based target disk calibration multidirectional adjustment auxiliary disk as in claim 1, wherein: the number of the target disc holes is 4, and the target disc holes are arranged in parallel.
3. The PIV-based target disk calibration multidirectional adjustment auxiliary disk as in claim 1, wherein: the level gauge is at least two, wherein at least one side wall is arranged at the front end of the horizontal disc, and at least one side wall is arranged at the two sides of the horizontal disc.
4. The PIV-based target disk calibration multidirectional adjustment auxiliary disk as in claim 1, wherein: the weight instrument has at least two weight instruments.
5. The PIV-based target disk calibration multidirectional adjustment auxiliary disk as in claim 1, wherein: the number of the screws is 4, two screws are fixed at one end of the slideway through hole and are symmetrically arranged, and the other two screws are arranged in the slideway through hole and are in sliding connection with the slideway through hole.
6. A method of testing a multi-directional adjustment auxiliary disc based on PIV target disc calibration as claimed in claim 3, comprising the steps of:
s1, fixedly connecting a target disc to the upper end of a horizontal disc or the back of a vertical disc through a target disc hole; fixedly connecting the target disc to the upper end of the horizontal disc when horizontal calibration is carried out, and fixedly connecting the target disc to the back of the vertical disc when vertical calibration is carried out;
s2, taking the central position of the front end edge of the horizontal disc as an origin, taking the right side as the X positive direction, taking the vertical inward direction as the Y direction and taking the vertical upward direction as the Z direction, and establishing a three-dimensional coordinate system;
s3, clamping the horizontal disc by using a bracket, and enabling the level gauges on the side wall at the front end and the side walls at the two sides of the horizontal disc to be kept in a horizontal state by adjusting the horizontal disc;
s4, pulling out the first tape measure in the horizontal disc or the second tape measure in the vertical disc; horizontally pulling out the first tape measure when the horizontal calibration is performed, and vertically pulling out the second tape measure when the vertical calibration is performed; according to the distance between the camera and the target disc determined in the past experiment, roughly determining the placement position of the camera through the scale of the tape measure;
s5, hanging weight lines on screws on the left side and the right side of the horizontal plate respectively, and sliding the screws to two ends of a slideway through hole or below the edge of the target plate; sliding the screw below the edge of the target disk when performing horizontal calibration, and sliding the screw to two ends of the slideway through hole when performing vertical calibration; adjusting the horizontal disc to enable the two heavy hammer lines to coincide when the two heavy hammer lines are seen from the Y-axis direction;
s6, observing whether the target disc is completely placed in a display window or not in an area picture to be detected in the computer, and performing fine adjustment by horizontally moving the camera;
s7, after the target disc is completely placed in the display window through the picture of the area to be measured in the computer, measuring the distance between the camera and the target disc through the first tape measure or the second tape measure, and completing the calibration operation.
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| CN201811242751.9A CN109085385B (en) | 2018-10-24 | 2018-10-24 | PIV target disc-based calibration multidirectional adjustment auxiliary disc and testing method thereof |
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| CN109085385B true CN109085385B (en) | 2023-11-07 |
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| Title |
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| 高位垂直进气转静系旋转盘腔流场的实验;陶智 等;《航空动力学报》;22(03);第347-351页 * |
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| CN109085385A (en) | 2018-12-25 |
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