CN113984328A - Three-degree-of-freedom adjusting platform for controlling PIV system measurement flow field - Google Patents
Three-degree-of-freedom adjusting platform for controlling PIV system measurement flow field Download PDFInfo
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- CN113984328A CN113984328A CN202111637656.0A CN202111637656A CN113984328A CN 113984328 A CN113984328 A CN 113984328A CN 202111637656 A CN202111637656 A CN 202111637656A CN 113984328 A CN113984328 A CN 113984328A
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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
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/065—Measuring arrangements specially adapted for aerodynamic testing dealing with flow
Abstract
The invention discloses a three-freedom-degree adjusting platform for controlling a PIV system measurement flow field, which comprises: the laser head positioning device comprises a bottom mounting platform, a movable supporting frame, a camera moving device, a laser head moving platform and a solid laser placing platform. The bottom mounting platform is fixed on the ground below the wind tunnel test section and is connected with the movable supporting frame through the sliding table to control the supporting frame to move in the wind tunnel incoming flow direction. The camera moving device is connected with the movable supporting frame, the camera can be driven by a motor to perform position adjustment on a plane vertical to the wind tunnel incoming flow, and the shooting plane can be adjusted through the spherical platform. The laser head moving platform is connected with the camera moving device through a connecting rod, and the camera is kept to be always focused on a laser emission plane in the moving process. And the placing platform is arranged on the side surface of the movable supporting frame and is used for placing the solid laser. The invention has simple structure and convenient operation, and can control the PIV system to measure the full flow field of the wind tunnel test section.
Description
Technical Field
The invention relates to the field of control and adjustment of wind tunnel experiment technology, in particular to a three-degree-of-freedom adjusting platform for controlling a PIV system measurement flow field.
Background
Wind power generation has been developed and utilized on a large scale in recent years as a clean and efficient new energy source. The research on the flow field characteristics of the wind driven generator has a significant meaning for improving the power generation efficiency of the wind power plant, and the wind tunnel experiment is an important method for obtaining the peripheral flow field characteristics when the wind wheel moves. Particle Image Velocimetry (PIV) technology is the most mature two-dimensional full-field Velocimetry technology in current flow field measurement, and can record a large amount of space point transient speed information in a flow field under the condition of not causing any interference to the flow field, so that the application range of the PIV technology is continuously expanded. The working principle of the PIV is mainly that the laser irradiates the tracer particles in a plane to be measured, camera equipment such as a CCD (charge coupled device) is used for shooting the moving image of the tracer particles in the plane, and finally the displacement of the tracer particles in two or more frames of pictures before and after the picture is calculated through a cross-correlation technology, so that the velocity vector distribution of a two-dimensional flow field is obtained.
In order to ensure that the camera can fully record the flow condition at each position of the laser plane, the camera and the laser emitting device are generally required to be respectively arranged at different positions of the wind tunnel. In addition, considering the limitation of the area of a shooting plane of a camera, if the flow condition of a certain plane to be measured of a flow field in a wind tunnel is to be completely shot, the shooting position of the camera needs to be changed for many times; and if the flow conditions of the section of the flow field at different heights in the wind tunnel are to be shot, the positions of the laser head and the camera need to be changed in real time in the measuring process so as to record the flow field data of different laser planes. And every time the shooting plane is changed, the positions of the laser head and the camera need to be manually adjusted, and the camera is focused on the laser plane again, so that the whole process is very complicated, and smooth measurement is not facilitated.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, one object of the present invention is to provide a three-degree-of-freedom adjustment platform for controlling a PIV system to measure a flow field, wherein the three-degree-of-freedom adjustment platform for controlling the PIV system to measure the flow field can capture full flow field information of a wind tunnel test section, and in a moving process, a camera is kept always focused on a laser emission plane, so that repeated focusing is avoided. In addition, the spherical platform can be used for adjusting the three-dimensional postures of the laser head and the camera, so that the laser emission plane and the shooting plane in measurement can be adjusted.
According to the three-degree-of-freedom adjusting platform for controlling the PIV system to measure the flow field, the three-degree-of-freedom adjusting platform for controlling the PIV system to measure the flow field comprises: the bottom mounting platform is fixedly mounted on the ground at the bottom of the wind tunnel testing section and comprises a guide rail, and the extending direction of the guide rail is the same as that of the wind tunnel; a movable support frame mounted on the guide rail and capable of sliding in a first direction; the camera moving device comprises a first driving unit and a camera moving platform, the camera moving platform is installed on the movable supporting frame through the first driving unit, and the first driving unit is used for driving the camera moving platform to slide along a second direction; the camera moving platform comprises a camera and a second driving unit, and the second driving unit is used for driving the camera to slide along a third direction; the solid laser placing platform is fixed on the movable supporting frame, and a solid laser is placed on the solid laser placing platform; the laser head moving platform comprises a connecting rod and a laser head connected to the solid laser, the laser head is further mounted on the camera moving platform through the connecting rod and can slide along a second direction along with the camera moving platform, and the laser head is used for emitting laser and forming a laser emitting plane; the camera is used for shooting the laser emission plane, and the first direction, the second direction and the third direction are perpendicular to each other.
The sliding of the movable supporting frame in the first direction is realized through two first direction guide rails on the bottom mounting platform, so that the movement of the camera in the first direction is realized, the movement of the camera in the second direction is realized through a first driving unit mounted on the movable supporting frame, finally, the movement of the camera in the third direction is realized through a second driving unit, the camera faces to one side close to the wind tunnel testing end in the second direction, the laser head faces to the third direction and one side close to the wind tunnel testing section emits laser and forms a laser plane, the movement of the camera in the first direction, the second direction and the third direction can be shot by utilizing a three-degree-of-freedom adjusting platform for controlling a PIV system to measure a flow field, in addition, the connecting rod can keep the camera always focused on the laser emitting plane in the moving process, and the three-dimensional postures of the laser head and the camera can be adjusted through a spherical platform, therefore, the laser emission plane and the shooting plane in measurement are adjusted, and the relative distance between the camera and the laser plane in the second direction is not changed in the whole test process, so that repeated focusing is not needed, and the complexity is greatly reduced.
In addition, the three-degree-of-freedom adjusting platform for controlling the measurement flow field of the PIV system according to the embodiment of the invention can also have the following additional technical characteristics:
in some embodiments of the present invention, the first driving unit includes a first sliding table, a first ball screw, and a first motor, the camera moving platform is fixed to the first sliding table, the first sliding table is mounted on the movable support frame, the first ball screw passes through the first sliding table and is mounted on the movable support frame, and the first motor is mounted at an end of the first ball screw to drive the first ball screw to rotate, so as to drive the first sliding table to slide on the movable support frame along the second direction.
In some embodiments of the present invention, the link is mounted on the first slide table.
In some embodiments of the present invention, the camera moving platform includes a mounting bracket fixed to the first sliding table, the second driving unit includes a second sliding table, a second ball screw and a second motor, the camera is fixed to the second sliding table, the second sliding table is slidably mounted on the mounting bracket, the second ball screw passes through the second sliding table and is mounted on the mounting bracket, and the second motor is mounted at an end of the second ball screw to drive the second ball screw to rotate, so as to drive the second sliding table to slide on the mounting bracket along a third direction.
In some embodiments of the present invention, the camera moving platform further includes a first L-shaped connecting member and a first spherical pan/tilt head, the first L-shaped connecting member is fixed to the second sliding table, the first spherical pan/tilt head is fixed to the first L-shaped connecting member, and the camera is fixed to the first spherical pan/tilt head and can adjust a three-dimensional posture through the first spherical pan/tilt head.
In some embodiments of the present invention, the laser head moving platform further includes a second L-shaped connecting member and a second spherical holder, the second L-shaped connecting member is fixed to an end of the connecting rod away from the first sliding table, the second spherical holder is fixed to the second L-shaped connecting member, and the laser head is fixed to the second spherical holder and can adjust a three-dimensional posture through the second spherical holder.
In some embodiments of the present invention, both ends of the first ball screw and the second ball screw are mounted with a baffle and an infrared stopper.
In some embodiments of the present invention, the movable support frame further includes a bottom slide table at a bottom thereof, and the movable support frame is mounted on the guide rail through the bottom slide table.
In some embodiments of the present invention, the movable support frame further includes a support rod disposed along the second direction and a connection rod disposed along the third direction, the support rod connects the bottom sliding table and the connection rod, the first sliding table and the solid laser placement platform are mounted on the support rod, and the mounting rack is disposed parallel to the connection rod.
In some embodiments of the present invention, the solid-state laser placement platform includes a first support leg, a second support leg, and a flat plate, the first support leg is connected to the support rod and extends along a third direction, the second support leg is connected to the first support leg and the support rod and forms an acute included angle with the first support leg and the support rod, the flat plate is located on the first support leg, and the solid-state laser is located on the flat plate.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a three-degree-of-freedom adjustment platform for controlling a measurement flow field of a PIV system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a camera moving device of a three-degree-of-freedom adjusting platform and a laser head moving platform for controlling a measurement flow field of a PIV system according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a first driving unit of a three-degree-of-freedom adjustment platform for controlling a measurement flow field of a PIV system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a partial structural connection between a solid laser placement platform and a movable support frame of a three-degree-of-freedom adjustment platform for controlling a measurement flow field of a PIV system according to an embodiment of the present invention.
Reference numerals:
three-degree-of-freedom adjusting platform 100,
A wind tunnel test section 101,
A bottom mounting platform 1, a guide rail 11,
A movable supporting frame 2,
A connecting rod 21, a supporting rod 22, a bottom sliding table 23,
A camera moving device 3,
A first driving unit 31, a first motor 311, a baffle 312, a first ball screw 313, a first sliding table 314, an infrared stopper 315,
A camera moving platform 32, a second driving unit 320, a mounting rack 321, a camera 322, a second ball screw 323, a second sliding platform 324, a first spherical pan-tilt 325, a first L-shaped connecting piece 326, a second motor 327,
A solid laser placing platform 4,
A first leg 41, a second leg 42, a flat plate 43, a solid laser 44,
A laser head moving platform 5,
A second L-shaped connecting piece 51, a second spherical pan-tilt 52, a laser head 53, a connecting rod 54,
A light guide arm 6.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the applicability of other processes and/or the use of other materials.
A three-degree-of-freedom adjustment platform 100 for controlling a measurement flow field of a PIV system according to an embodiment of the present invention is described below with reference to fig. 1 to 4.
The three-degree-of-freedom adjusting platform 100 for controlling a measurement flow field of a PIV system according to an embodiment of the present invention includes: the device comprises a bottom mounting platform 1, a movable supporting frame 2, a camera 322 moving device 3, a solid laser 44 placing platform 4 and a laser head 53 moving platform 5.
Specifically, the bottom mounting platform 1 is fixedly mounted on the ground at the bottom of the wind tunnel testing section, the bottom mounting platform 1 comprises a guide rail 11, and the extending direction of the guide rail 11 is the same as the extending direction of the wind tunnel; the movable support frame 2 is mounted on the guide rail 11 and is slidable in a first direction; the camera 322 moving device 3 comprises a first driving unit 31 and a camera 322 moving platform 32, the camera 322 moving platform 32 is mounted on the movable supporting frame 2 through the first driving unit 31, and the first driving unit 31 is used for driving the camera 322 moving platform 32 to slide along the second direction; the camera 322 moving platform 32 includes a camera 322 and a second driving unit 320, the second driving unit 320 is used for driving the camera 322 to slide along a third direction; the solid laser 44 placing platform 4 is fixed on the movable supporting frame 2, and the solid laser 44 is placed on the solid laser 44 placing platform 4; the laser head 53 moving platform 5 comprises a connecting rod 54 and a laser head 53 connected to the solid laser 44, the laser head 53 is further mounted on the camera 322 moving platform 32 through the connecting rod 54 and can slide along the second direction along with the camera 322 moving platform 32, and the laser head 53 is used for emitting laser and forming a laser emitting plane; the camera 322 is used for shooting a laser emission plane, and the first direction, the second direction and the third direction are perpendicular to each other.
Here, the first direction may be an X direction, the second direction may be a Z direction, and the third direction may be a Y direction, and a constituent frame of the three-degree-of-freedom adjustment platform 100 for controlling the measurement flow field of the PIV system may be, for example, an aluminum profile.
The bottom mounting platform 1 is fixedly mounted on the ground at the bottom of the wind tunnel test section, and the bottom mounting platform 1 can be composed of four aluminum profiles, namely two aluminum profiles in the X direction (first direction) and two aluminum profiles in the Y direction (third direction). Wherein, two Y direction aluminium alloy accessible inflation screw fixation of bottom mounting platform 1 are subaerial in wind-tunnel test section bottom, in order to reach the purpose of fixed bottom mounting platform 1, surface mounting has guide rail 11 on two aluminium alloy of bottom mounting platform 1X direction, two guide rail 11 parallel arrangement, and baffle 312 is installed at both ends, in order to reach spacing purpose, two X direction aluminium alloy link to each other with two Y direction aluminium alloy mutually perpendicular, the X direction aluminium alloy of bottom mounting platform 1 passes through the reinforcement and is connected with Y direction aluminium alloy, and can constitute "mouth" style of calligraphy structure and make bottom mounting platform 1 tend to steadily, here, the reinforcement can be the corner fittings, the tripod, the diagonal pole. The bottom of the movable supporting frame 2 is connected with the guide rail 11 of the bottom mounting platform 1 in a sliding manner, and the guide rail 11 of the bottom mounting platform 1 extends towards the X direction, so that the guide rail 11 of the bottom mounting platform 1 provides a movable direction for the sliding of the movable supporting frame 2 in the X direction; the camera 322 moving device 3 includes a first driving unit 31 and a camera 322 moving platform 32, the first driving unit 31 is installed in the Z direction of the movable frame, the first driving unit 31 can generate a driving force in the Z direction, and the camera 322 moving platform 32 is connected to the first driving unit 31 through a bolt, so that the camera 322 moving platform 32 can be indirectly installed on the movable supporting frame 2 through the first driving unit 31, and the movement of the camera 322 moving platform 32 in the Z direction can be realized along with the driving force generated by the first driving unit 31. The camera 322 moving platform 32 comprises a camera 322 and a second driving unit 320, wherein the camera 322 moving platform 32 is parallel to the aluminum profile structure of the movable supporting frame 2 in the Y direction, the second driving unit 320 is installed in the Y direction of the camera 322 moving platform 32, and the second driving unit 320 generates a driving force in the Y direction. The camera 322 is mounted on the second driving unit 320, and it is known that the camera 322 can move on the second driving unit 320 along the Y direction along with the driving force of the second driving unit 320, and as is known above, the driving force generated by the first driving unit 31 can realize the movement of the moving platform 32 of the camera 322 in the Z direction, and further, the driving force generated by the first driving unit 31 can realize the movement of the camera 322 in the Z direction, and the driving force generated by the second driving unit 320 can realize the movement of the camera 322 in the Y direction. The solid laser 44 placing platform 4 is fixed on the movable supporting frame 2 and is arranged at one side close to the wind tunnel testing end 101, the solid laser 44 placing platform 4 is also fixed on the movable supporting frame 2 through the reinforcing part, the solid laser 44 is arranged below the camera 322 moving frame, and the solid laser 44 is placed on the solid laser 44 placing platform 4; the laser head 53 moving platform 5 comprises a connecting rod 54 and a laser head 53 connected to the solid laser 44, the connecting rod 54 connects the laser head 53 moving platform 5 with the camera 322 moving platform 32 in the Z direction, and the laser head 53 moving platform 5 is integrally arranged in the Z direction, as known above, the camera 322 moving platform 32 can move in the Z direction along with the driving force of the first driving unit 31, further, under the driving force of the first driving unit 31, the camera 322 moving platform 32 can drive the connecting rod 54 to move in the Z direction, further, the camera 322 moving platform 32 can drive the laser head 53 moving platform 5 to move in the Z direction, in addition, one end of the laser head 53 on the laser head 53 moving platform 5 is connected with the connecting rod 54, and the other end is indirectly connected with the solid laser 44, and an arm 6 with a telescopic structure is arranged between the solid laser 44 and the laser head 53, and the light guide arm 6 is connected with the laser head 53 in the Z direction, and the laser head 53 emits laser and forms a laser plane towards the Y direction and the side close to the wind tunnel test section. It can be seen that the laser head 53 is indirectly connected to the moving platform 32 of the camera 322 through the connecting rod 54 in the Z direction, and further that the driving force generated in the Z direction by the second unit will follow the movement of the laser head 53 in the Z direction, so that the displacement of the laser plane in the Z direction can be realized. The camera 322 is used for shooting a laser emission plane, and the first direction, the second direction and the third direction are perpendicular to each other. The camera 322 faces to one side close to the wind tunnel test end 101 in the Z direction, the laser head 53 emits laser light and forms a laser plane towards the Y direction and one side close to the wind tunnel test section, and therefore, under the action of the first driving unit 31 and the second driving unit 320, shooting of the camera 322 on the laser plane in the first direction, the second direction and the third direction is achieved, the first direction, the second direction and the third direction are perpendicular to each other, linear motion of the camera 322 moving platform 32 in the Z direction is achieved, the first direction is perpendicular to the third direction, linear motion of the camera 322 moving platform 32 in the Y direction is achieved, the second direction is perpendicular to the third direction, and horizontal shooting of the camera 322 on the laser plane is achieved. The three-dimensional postures of the laser head 53 and the camera 322 can be adjusted by the first spherical holder 325 and the second spherical holder 52, respectively, so as to adjust a laser plane and a shooting plane in measurement.
According to the three-degree-of-freedom adjusting platform 100 for controlling the PIV system to measure the flow field, the movable supporting frame 2 slides in the first direction through the two first-direction guide rails 11 on the bottom mounting platform 1, so that the camera 322 moves in the first direction, the camera 322 moves in the second direction through the first driving unit 31 mounted on the movable supporting frame 2, finally the second driving unit 320 moves the camera 322 in the third direction, the camera 322 faces to one side close to the wind tunnel test end 101 in the second direction, the laser head 53 emits laser light towards the third direction and one side close to the wind tunnel test section to form a laser plane, the camera 322 can shoot the full flow field information of the wind tunnel test section by utilizing the movement of the three-degree-of-freedom adjusting platform 100 for controlling the PIV system to measure the flow field in the first direction, the second direction and the third direction, in the moving process, the connecting rod 54 can keep the camera 322 always focused on the laser emitting plane, and in the whole testing process, the relative distance between the camera 322 and the laser plane in the second direction is not changed, so that repeated focusing is not needed, and the complexity is greatly reduced.
According to the three-degree-of-freedom adjustment platform 100 for controlling a measurement flow field of a PIV system in an embodiment of the present invention, the first driving unit 31 includes a first sliding table 314, a first ball screw 313 and a first motor 311, the camera 322 moving platform 32 is fixed to the first sliding table 314, the first sliding table 314 is mounted on the movable supporting frame 2, the first ball screw 313 passes through the first sliding table 314 and is mounted on the movable supporting frame 2, and the first motor 311 is mounted at an end of the first ball screw 313 to drive the first ball screw 313 to rotate, so as to drive the first sliding table 314 to slide on the movable supporting frame 2 along the second direction.
In some embodiments, the first driving unit 31 may include a first sliding table 314, a first ball screw 313 and a first motor 311, the first sliding table 314 is slidably connected with the Z-direction aluminum profile of the movable supporting frame 2 in the Z-direction, therefore, the first sliding table 314 is mounted on the movable support frame 2, the camera 322 moving platform 32 is fixedly connected with the first sliding table 314 by bolts, therefore, the first sliding table 314 can drive the camera 322 moving platform 32 to move in the Z direction, the first ball screw 313 passes through the first sliding table 314 in the Z direction, the first ball screw 313 is mounted on the movable supporting frame 2, the first motor 311 is mounted at the end of the first ball screw 313, so as to drive the whole first ball screw 313, the whole driving process of the first driving unit 31 drives the first ball screw 313 to rotate through the first motor 311, and the first ball screw 313 rotates to effect the displacement movement of the first slide table 314 in the Z direction.
According to the three-degree-of-freedom adjusting platform 100 for controlling the measurement flow field of the PIV system, the connecting rod 54 is installed on the first sliding table 314.
As shown in fig. 2, the connecting rod 54 is fixedly connected to the first sliding table 314 through a bolt in the Z direction, so that the connecting rod 54 moves along with the movement of the first sliding table 314 in the Z direction, and meanwhile, the laser head 53 connected to the connecting rod 54 displaces along with the movement of the connecting rod 54 in the Z direction.
According to the three-degree-of-freedom adjusting platform 100 for controlling the measurement flow field of the PIV system in the embodiment of the present invention, the camera 322 moving platform 32 includes a mounting bracket 321 fixed to the first sliding table 314, the second driving unit 320 includes a second sliding table 324, a second ball screw 323 and a second motor 327, the camera 322 is fixed to the second sliding table 324, the second sliding table 324 is slidably mounted on the mounting bracket 321, the second ball screw 323 passes through the second sliding table 324 and is mounted on the mounting bracket 321, and the second motor 327 is mounted at an end of the second ball screw 323 to drive the second ball screw 323 to rotate, so as to drive the second sliding table 324 to slide on the mounting bracket 321 along the third direction.
Specifically, the camera 322 moving platform 32 includes a mounting rack 321 fixed on the first sliding table 314, the mounting rack 321 is parallel to the aluminum profile in the Y direction of the movable supporting frame 2, it is ensured that the camera 322 moving platform 32 moves in the Y direction along the horizontal direction, the mounting rack 321 is fixedly connected with the first sliding table 314 through a bolt, and then the first sliding table 314 enables the mounting rack 321 to move in the Z direction, the mounting rack 321 is provided with a second driving unit 320, the second driving unit 320 drives along the mounting rack 321 direction, the second driving device includes a second sliding table 324, a second ball screw 323 and a second motor 327, the second sliding table 324 is connected with the mounting rack 321 in the Y direction in a sliding manner, the second sliding table 324 is connected with the camera 322, the second motor 327 is installed at an end of the second ball screw 323, so as to drive the whole second ball screw 323, the whole driving process of the second driving unit 320, the second ball screw 323 is driven by the second motor 327 to rotate, and then the second ball screw 323 rotates to realize the displacement motion of the second sliding table 324 in the Y direction, and further realize the motion of the camera 322 in the Y direction.
According to the three-degree-of-freedom adjusting platform 100 for controlling the measurement flow field of the PIV system, the camera 322 moves the platform 32, and the camera 322 moves the platform 32, further comprising a first L-shaped connector 326 and a first spherical pan-tilt 325, wherein the first L-shaped connector 326 is fixed on the second sliding table 324, the first spherical pan-tilt 325 is fixed on the first L-shaped connector 326, and the camera 322 is fixed on the first spherical pan-tilt 325 and can adjust the three-dimensional posture through the first spherical pan-tilt 325.
In some embodiments, the camera 322 moving platform 32 is composed of a first L-shaped connector 326 and a first spherical holder 325, the first L-shaped connector 326 is connected with the second sliding table 324 through a bolt in the Y direction, the first L-shaped connector 326 is connected with the first spherical holder 325 through a bolt in the Z direction, the first spherical holder 325 is connected with the camera 322, and the second sliding table 324 is indirectly connected with the camera 322, so that the purpose that the second sliding table 324 moves to drive the camera 322 to generate displacement change is achieved. In addition, the first spherical holder 325 can be used to fix the camera 322 and also serve to level the camera 322.
According to the three-degree-of-freedom adjusting platform 100 for controlling the measurement flow field of the PIV system, the camera 322 moving platform 32 and the laser head 53 moving platform 5 of the embodiment of the invention further comprise a second L-shaped connecting piece 51 and a second spherical pan-tilt 52, wherein the second L-shaped connecting piece 51 is fixed at one end of the connecting rod 54 far away from the first sliding table 314, the second spherical pan-tilt 52 is fixed on the second L-shaped connecting piece 51, and the laser head 53 is fixed on the second spherical pan-tilt 52 and can adjust the three-dimensional posture through the second spherical pan-tilt 52.
In some embodiments, the laser head 53 moving platform 5 may be composed of a second L-shaped connecting member 51 and a second spherical pan/tilt head 52, the second L-shaped connecting member 51 is fixed to one end of the connecting rod 54 far from the first sliding table 314, the second L-shaped connecting member 51 is fixedly connected to the connecting rod 54 through a bolt in the Z direction, the second L-shaped connecting member 51 is fixedly connected to the second spherical pan/tilt head 52 through a bolt in the Z direction, the second spherical pan/tilt head 52 is connected to the laser head 53, so that the first sliding table 314 is indirectly connected to the laser head 53, the second spherical pan/tilt head 52 may be used to fix the laser head 53, and simultaneously, the laser head 53 is leveled, and further, the movement of the first sliding table 314 in the Z direction may drive the laser head 53 and the camera 322 to synchronously move relatively in the Z direction.
According to the three-degree-of-freedom adjusting platform 100 for controlling the measurement flow field of the PIV system, the camera 322 moves the platform 32, and the baffle 312 and the infrared limiter 315 are mounted at the two ends of the first ball screw 313 and the second ball screw 323.
As shown in fig. 3, a baffle 312 is disposed at one end of each of the first ball screw 313 and the second ball screw 323 in the Z direction and the Y direction, which is close to the first motor 311 and the second motor 327, a baffle 312 is also disposed at one end of each of the first motor 311 and the second motor 327, the first ball screw 313 and the second ball screw 323 are mounted on the baffle 312, so that the stressed areas of the first ball screw 313 and the second ball screw 323 are increased, and the infrared stopper 315 is disposed at one end of each of the first motor 311 and the second motor 327, and plays a role in limiting with respect to the first sliding table 314 and the second sliding table 324.
According to the three-degree-of-freedom adjusting platform 100 for controlling the measurement flow field of the PIV system in the embodiment of the present invention, the movable supporting frame 2 further includes a bottom sliding table 23 located at the bottom thereof, and the movable supporting frame 2 is mounted on the guide rail 11 through the bottom sliding table 23.
In some embodiments, the bottom of the movable frame is provided with a bottom sliding table 23, the bottom sliding table 23 is consistent with the extending direction of the wind tunnel test section, the bottom sliding table 23 of the movable support frame 2 is parallel to the X-direction aluminum profile of the bottom mounting platform 1, and the bottom sliding table 23 is slidably connected with the guide rail 11 on the bottom mounting platform 1, so that the movement of the movable support frame 2 in the X direction is realized.
According to the three-degree-of-freedom adjusting platform 100 for controlling the measurement flow field of the PIV system in the embodiment of the present invention, the movable supporting frame 2 further includes a supporting rod 22 arranged along the second direction and a connecting rod 21 arranged along the third direction, the supporting rod 22 is connected with the bottom sliding table 23 and the connecting rod 21, the first sliding table 314 and the solid laser 44 placing platform 4 are installed on the supporting rod 22, and the mounting frame 321 is arranged in parallel with the connecting rod 21.
Remove braced frame still includes the bracing piece 22 that sets up along the second direction and the connecting rod 21 that sets up along the third direction, and bracing piece 22 sets up along the Z direction, and bracing piece 22 is provided with first drive unit 31 in the Z direction, and the bracing piece 22 inboard is provided with solid laser 44 place the platform 4 in the Y direction, and the bottom of bracing piece 22 is provided with bottom slip table 23, and bracing piece 22 is perpendicular to bottom mounting platform 1 in the Z direction. The connecting rod 21 is perpendicular to and fixedly connected with the supporting rod 22, and the connecting rod 21 is parallel to the mounting rack 321 in the Y direction.
According to the three-degree-of-freedom adjusting platform 100 for controlling the measurement flow field of the PIV system in the embodiment of the present invention, the solid laser 44 placing platform 4 includes the first supporting leg 41, the second supporting leg 42 and the flat plate 43, the first supporting leg 41 is connected with the supporting rod 22 and extends along the third direction, the second supporting leg 42 is connected with the first supporting leg 41 and the supporting rod 22 and forms an acute included angle with the first supporting leg 41 and the supporting rod 22, the flat plate 43 is located on the first supporting leg 41, and the solid laser 44 is located on the flat plate 43.
Other configurations and operations of the three-degree-of-freedom adjustment platform 100 for controlling a measurement flow field of a PIV system according to an embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features. In the description of the present invention, "a plurality" means two or more. In the description of the present invention, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween. In the description of the invention, "above", "over" and "above" a first feature in a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A three-degree-of-freedom adjusting platform for controlling a PIV system measurement flow field is characterized by comprising:
the bottom mounting platform is fixedly mounted on the ground at the bottom of the wind tunnel testing section and comprises a guide rail, and the extending direction of the guide rail is the same as that of the wind tunnel;
a movable support frame mounted on the guide rail and capable of sliding in a first direction;
the camera moving device comprises a first driving unit and a camera moving platform, the camera moving platform is installed on the movable supporting frame through the first driving unit, and the first driving unit is used for driving the camera moving platform to slide along a second direction; the camera moving platform comprises a camera and a second driving unit, and the second driving unit is used for driving the camera to slide along a third direction;
the solid laser placing platform is fixed on the movable supporting frame, and a solid laser is placed on the solid laser placing platform;
the laser head moving platform comprises a connecting rod and a laser head connected to the solid laser, the laser head is further mounted on the camera moving platform through the connecting rod and can slide along a second direction along with the camera moving platform, and the laser head is used for emitting laser and forming a laser emitting plane; wherein the content of the first and second substances,
the camera is used for shooting the laser emission plane, and the first direction, the second direction and the third direction are mutually vertical.
2. The three-degree-of-freedom adjustment platform for controlling a measurement flow field of a PIV system according to claim 1, wherein the first driving unit includes a first sliding table, a first ball screw, and a first motor, the camera moving platform is fixed to the first sliding table, the first sliding table is mounted on the movable support frame, the first ball screw passes through the first sliding table and is mounted on the movable support frame, and the first motor is mounted at an end of the first ball screw to drive the first ball screw to rotate, so as to drive the first sliding table to slide on the movable support frame along the second direction.
3. The three degree-of-freedom adjustment platform for controlling a measurement flow field of a PIV system of claim 2, wherein the link is mounted on the first slide table.
4. The three-degree-of-freedom adjustment platform for controlling the measurement flow field of the PIV system according to claim 2, wherein the camera moving platform includes a mounting bracket fixed to the first sliding table, the second driving unit includes a second sliding table, a second ball screw and a second motor, the camera is fixed to the second sliding table, the second sliding table is slidably mounted to the mounting bracket, the second ball screw passes through the second sliding table and is mounted to the mounting bracket, and the second motor is mounted to an end of the second ball screw to drive the second ball screw to rotate, so as to drive the second sliding table to slide on the mounting bracket along the third direction.
5. The three-degree-of-freedom adjusting platform for controlling the measurement flow field of the PIV system according to claim 4, wherein the camera moving platform further comprises a first L-shaped connecting member and a first spherical pan/tilt head, the first L-shaped connecting member is fixed on the second sliding table, the first spherical pan/tilt head is fixed on the first L-shaped connecting member, and the camera is fixed on the first spherical pan/tilt head and can adjust the three-dimensional attitude through the first spherical pan/tilt head.
6. The three-degree-of-freedom adjusting platform for controlling the measurement flow field of the PIV system according to claim 5, wherein the laser head moving platform further comprises a second L-shaped connecting piece and a second spherical holder, the second L-shaped connecting piece is fixed at one end of the connecting rod, which is far away from the first sliding table, the second spherical holder is fixed on the second L-shaped connecting piece, and the laser head is fixed on the second spherical holder and can adjust the three-dimensional attitude through the second spherical holder.
7. The three-degree-of-freedom adjusting platform for controlling the PIV system measurement flow field according to claim 4, wherein two ends of the first ball screw and the second ball screw are provided with a baffle and an infrared limiter.
8. The three degree-of-freedom adjustment platform for controlling a measurement flow field of a PIV system of claim 4, wherein the movable support frame further includes a bottom slide table at a bottom thereof, and the movable support frame is mounted on the guide rail through the bottom slide table.
9. The three-degree-of-freedom adjustment platform for controlling the measurement flow field of the PIV system according to claim 8, wherein the movable support frame further includes a support rod disposed along the second direction and a connecting rod disposed along the third direction, the support rod is connected to the bottom sliding table and the connecting rod, the first sliding table and the solid laser placement platform are mounted on the support rod, and the mounting bracket is disposed parallel to the connecting rod.
10. The three-degree-of-freedom adjustment platform for controlling a measurement flow field of a PIV system according to claim 9, wherein the solid laser placement platform comprises a first support leg, a second support leg and a flat plate, the first support leg is connected to the support rod and extends in a third direction, the second support leg is connected to the first support leg and the support rod and forms an acute included angle with the first support leg and the support rod, the flat plate is located on the first support leg, and the solid laser is located on the flat plate.
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