CN107345536B - Wind tunnel flow field start-stop damping device - Google Patents
Wind tunnel flow field start-stop damping device Download PDFInfo
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- CN107345536B CN107345536B CN201710758682.6A CN201710758682A CN107345536B CN 107345536 B CN107345536 B CN 107345536B CN 201710758682 A CN201710758682 A CN 201710758682A CN 107345536 B CN107345536 B CN 107345536B
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- 238000013016 damping Methods 0.000 title claims abstract description 37
- 238000013519 translation Methods 0.000 claims abstract description 51
- 230000007246 mechanism Effects 0.000 claims description 24
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 17
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/002—Influencing flow of fluids by influencing the boundary layer
- F15D1/0025—Influencing flow of fluids by influencing the boundary layer using passive means, i.e. without external energy supply
- F15D1/003—Influencing flow of fluids by influencing the boundary layer using passive means, i.e. without external energy supply comprising surface features, e.g. indentations or protrusions
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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
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention provides a wind tunnel flow field start-stop damping device which comprises a translation plate, a connecting rod, a ball screw, a servo motor, a box body, a wall plate and a sliding block connecting piece, wherein the box body is arranged above the wall plate; the connecting rod adopts a crank connecting rod structure, one end of the crank connecting rod is connected with a nut on the ball screw through a hinge, and the other end of the crank connecting rod is connected with the translation plate through a hinge; the translation plate and the wall plate are arranged in parallel. The damping device provided by the invention has the characteristics of compact structure and good dynamic performance, can be installed and used in a wind tunnel in a limited space, can well inhibit impact load on a model and a balance at the moment of starting and stopping a flow field, and improves the accuracy of test data acquisition.
Description
Technical Field
The invention relates to a device for wind tunnel experiments, in particular to a wind tunnel flow field start-stop damping device which is used for suppressing and damping impact load caused by a model or a balance when a flow field is started and stopped in the wind tunnel experiment process.
Background
Wind tunnel experiments refer to an aerodynamic experimental method for arranging an aircraft or other object model in a wind tunnel, and researching gas flow and interaction between the air flow and the model to know aerodynamic characteristics of an actual aircraft or other object. According to the relative principle of motion, a model or a real object of an aircraft or other objects is fixed in a ground artificial environment, and air flow is manufactured artificially to flow through the model or the real object, so that various complex flight states in the air are simulated, and test data are acquired.
With the high-speed development of aerodynamics in China, the wind tunnel test plays an important role in the research and development of aviation and aerospace engineering, and plays an indispensable role in the fields of transportation, house construction, wind energy utilization and the like. In order to make the test result accurate, the flow at the time of the test must be similar to the actual flow state, i.e., the requirement of the similarity law must be satisfied.
At present, in the wind tunnel test process, when the wind tunnel is started and stopped, in the process from the non-arrival to the stable state or from the stable state to the disappearance, airflow can generate an impact load on a model, a balance and the like, so that the model and the balance vibrate violently. The vibration not only affects the accuracy of test results, but also can damage the model and the balance, even lead to the breakage of the model and the balance, and threaten the safety of wind tunnel experiments.
Because a large number of control equipment and measuring equipment are placed in the wind tunnel test section residence chamber in the wind tunnel test process, a large amount of space is occupied. Therefore, a damping device with a compact structure needs to be developed and placed in a limited space of a wind tunnel test section residence chamber, so that impact of air flow on a model is restrained at the moment of starting and stopping of a wind tunnel.
Disclosure of Invention
The invention aims to solve the technical problems and provides a wind tunnel flow field start-stop damping device. The damping device has the characteristics of compact structure and good dynamic performance, can be installed and used in a wind tunnel in a limited space, and can well inhibit adverse effects such as impact on a model and a balance caused by flow field starting and closing moments, so that the accuracy of test data acquisition is improved. The damping device is particularly suitable for being used when the flow field of the supersonic wind tunnel is started and stopped.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the wind tunnel flow field start-stop damping device comprises a translation plate, a connecting rod, a ball screw, a linear guide rail, a servo motor, a box body, a wall plate and a sliding block connecting piece, wherein the box body is arranged above the wall plate and is provided with a side panel and an upper panel, the servo motor is fixed at one end of the side panel of the box body, and the servo motor is in shaft connection with the ball screw at the other end of the side panel through a shaft coupling; the linear guide rail is fixed at the lower part of the upper panel of the box body, the linear guide rail is positioned above the ball screw, a sliding block is arranged on the linear guide rail, a sliding block connecting piece is fixedly arranged on the sliding block, and the sliding block connecting piece is fixedly connected with the ball screw through a nut; the connecting rod adopts a crank connecting rod structure, one end of the crank connecting rod is connected with the sliding block connecting piece through a hinge, and the other end of the crank connecting rod is connected with the translation plate through a hinge; the translation plate and the wall plate are always arranged in parallel.
The damping device provided by the invention can be well used for damping when the wind tunnel flow field is started and stopped, and the impact of the airflow flow field on the model or balance in the process of no-steady state or steady state-disappearance of the airflow flow field is greatly reduced. When the device is placed in a wind tunnel, before the flow field is started and established, the damping devices are placed on the upper part and the lower part of the balance or the model, the translational plates can be manually adjusted to corresponding working positions (mainly adjusting the distance between the translational plates and the model or the balance), the upper translational plates and the lower translational plates are positioned between the balance or the model, then the ball screw is driven by the servo motor to do rotary motion, and the connecting rod is driven by the nut on the ball screw to do rotary motion, so that the translational plates at the end part of the connecting rod are driven to do circular arc motion, the plate collecting and releasing motion of the translational plates are realized, the impact on the model or the balance during the starting and stopping of the flow field is reduced through the limitation of the translational plates, the impact load on the model or the balance during the starting and stopping moments of the flow field (particularly supersonic flow field) is well restrained, and a good damping effect is generated.
The damping device is provided with the linear guide rail, the sliding block and the sliding block connecting piece are arranged on the linear guide rail, and the sliding block connecting piece is connected with the nut on the ball screw, so that the nut on the ball screw can do linear motion along the linear guide rail, and the accuracy and precision of controlling the motion position of the translation plate are well ensured. The damping device has the characteristics of good dynamic performance, has a compact overall structure, can be completely used in a limited wind tunnel, and solves the impact influence of a wind tunnel flow field on a model or a balance.
The ball screw is driven by the servo motor, the servo motor can be connected with or connected with an external control system, and the running speed of the servo motor is set through the control system, so that the ball screw is driven to perform linear motion, and the accurate plate collecting and placing operation of the translation plate is realized.
Further, the connecting rod comprises a first connecting rod, a second connecting rod and a third connecting rod, the upper ends of the first connecting rod and the second connecting rod are connected with the box body through hinges, and the lower ends of the first connecting rod and the second connecting rod are connected with the translation plate through hinges; one end of the third connecting rod is connected with the middle part of the crank of the second connecting rod through a hinge, and the other end of the third connecting rod is connected with the sliding block connecting piece through a hinge. By adopting the structural design of three groups of crank connecting rods, the motion track and the position of the translation plate can be controlled more conveniently and accurately.
Further, the damping device further comprises a mechanical limiting mechanism, the mechanical limiting mechanism is located under the ball screw and is arranged in parallel with the ball screw, a stop block is arranged on the mechanical limiting mechanism and can move along the mechanical limiting mechanism, and an optical axis in the mechanical limiting mechanism is used as a guide rail to be connected with a screw rod in the mechanical limiting mechanism, so that the adjustable mechanical limiting device is realized. The mechanical limiting mechanism can well limit the nut, so that a more accurate control effect is achieved when the ball screw is controlled to do rotary motion.
Further, the translation plate is located below the wall plate, and the first connecting rod and the second connecting rod penetrate through the wall plate and are connected with the translation plate below the wall plate. The translation plate is positioned below the wall plate, so that the movement of the translation plate is conveniently controlled, and a sufficient movement space of the translation plate is provided.
Further, a translation plate accommodating groove for storing the translation plate is formed in the lower portion of the wall plate. The translation plate can be retracted into the translation plate accommodating groove, and the influence of the damping device on the flow field in the flow field establishment process can be reduced to the greatest extent.
Further, the second connecting rod, the third connecting rod, the ball screw and the servo motor form a crank sliding block mechanism, the ball screw is driven by the servo motor to do rotary motion, and the nut on the ball screw is used for driving the second connecting rod and the third connecting rod to do rotary motion.
Further, the translation plate, the first connecting rod, the second connecting rod and the box body form a parallel four-connecting-rod mechanism, and the first connecting rod and the second connecting rod with crank structures are used for performing rotary motion so as to drive the translation plate to perform circular arc motion, and the translation plate is always parallel to the wall plate when performing circular arc motion.
Furthermore, the translation plate, the first connecting rod and the second connecting rod are all designed to be in a peripheral chamfer structure. The structural design of chamfer at the periphery is adopted, so that the resistance can be effectively reduced in the flow field, and a certain flow guiding effect is achieved.
The invention has the beneficial effects that:
(1) The damping device adopts the servo motor to drive the ball screw, so that the translation plate can be ensured to rapidly and accurately move to the position required by the test section;
(2) The crank connecting rod and other devices adopted by the invention form a crank sliding block mechanism and a parallel four-bar mechanism, so that the translational plate can well complete circular arc motion in a limited space, and the invention has the advantages of good dynamic performance, compact integral structure and high bearing capacity of the device;
(3) The invention makes the translation plate do the plate folding and unfolding motion in the arc direction, well staggers the positions of the translation plate and the translation plate containing groove, and reduces the influence of the notch position on the flow field at the model.
Drawings
FIG. 1 is a schematic view of a translational plate deployment configuration of a shock absorber device of the present invention;
FIG. 2 is a schematic view of a translational plate contraction structure of a shock absorbing device according to the present invention;
FIG. 3 is a schematic view of a shock absorbing device according to the present invention.
Detailed Description
In order to make the technical scheme and gist of the present invention more clear, the present invention is further described below with reference to the following examples and the accompanying drawings, which are only used for explaining the present invention and are not used for limiting the protection scope of the present invention.
Example 1
As shown in fig. 1-3, the wind tunnel flow field start-stop damping device provided by the invention comprises a translation plate 1, a connecting rod 2 (namely, the damping device consists of a first connecting rod 2-1, a second connecting rod 2-2 and a third connecting rod 2-3), a ball screw 3, a mechanical limiting mechanism 4, a linear guide rail 5, a servo motor 6, a box body 7, a wall plate 8 and a sliding block connecting piece 9, wherein the box body 7 is arranged above the wall plate 8, the box body 7 is provided with a side plate and an upper panel, the servo motor 6 is fixed at one end of the side plate of the box body 7, and the servo motor 6 is in shaft connection with the ball screw 3 at the other end of the side plate through a coupler; the linear guide rail 5 is fixed on the lower part of the upper panel of the box body 7, the linear guide rail 5 is positioned above the ball screw 3, the linear guide rail 5 is provided with the sliding block 5-1, the sliding block 5-1 is fixedly provided with the sliding block connecting piece 9, and the sliding block connecting piece 9 is fixedly connected with the ball screw 3 through the nut 3-1.
The connecting rod 2 consists of a first connecting rod 2-1, a second connecting rod 2-2 and a third connecting rod 2-3, all adopt crank connecting rod structures, the upper ends of the first connecting rod 2-1 and the second connecting rod 2-2 are connected with the box body 7 through hinges, and the lower ends of the first connecting rod 2-1 and the second connecting rod 2-2 are connected with the translation plate 1 through hinges; one end of the third connecting rod 2-3 is connected with the crank middle part of the second connecting rod 2-2 through a hinge, and the other end of the third connecting rod 2-3 is connected with the sliding block connecting piece 9 through a hinge. The translation plate 1 is positioned below the wall plate 8, the first connecting rod 2-1 and the second connecting rod 2-2 penetrate through the wall plate 8 and are connected with the translation plate 1 below the wall plate 8, the translation plate 1 and the wall plate 8 are arranged in parallel, the translation plate 1, the first connecting rod 2-1 and the second connecting rod 2-2 are all designed into a peripheral chamfer structure, and a translation plate accommodating groove 10 for storing the translation plate 1 is formed in the lower portion of the wall plate 8.
The second connecting rod 2-2, the third connecting rod 2-3, the ball screw 3 and the servo motor 6 form a crank sliding block mechanism, the ball screw 3 is driven to do rotary motion through the servo motor 6, and the nut 3-1 on the ball screw 3 drives the third connecting rod 2-3 and the second connecting rod 2-2 to do rotary motion.
The translation plate 1, the first connecting rod 2-1, the second connecting rod 2-2 and the box 7 form a parallel four-bar mechanism, and the translation plate 1 is driven to do circular arc motion by the rotation motion of the first connecting rod 2-1 and the second connecting rod 2-2, so that the translation plate 1 is always parallel to the wall plate 8 when doing circular arc motion.
The mechanical limiting mechanism 4 is positioned right below the ball screw 3 and is arranged in parallel with the ball screw 3, the stop block 4-1 is arranged on the mechanical limiting mechanism 4, the stop block 4-1 takes an optical axis in the mechanical limiting mechanism 4 as a guide rail and is connected with a screw rod in the mechanical limiting mechanism 4, so that an adjustable mechanical limiting device is realized, and the stop block 4-1 can correspondingly move along the mechanical limiting mechanism 4 in the same direction when the nut 3-1 moves.
Application example 1
The damping device in the embodiment 1 of the invention is used for supersonic wind tunnel test, a set of damping device is respectively adopted above and below a balance or a model in a wind tunnel before wind tunnel test, the translational plate 1 is manually adjusted to a corresponding working position (mainly adjusting the distance between the translational plate and the model) before the supersonic flow field of the wind tunnel is started, so that the balance or the model is positioned between the upper translational plate 1 and the lower translational plate 1, and when the wind tunnel is started, the balance or the model only slightly vibrates due to the limitation of the upper translational plate 1 and the lower translational plate 1; after the airflow flow field is stable, a control system connected with the outside sends out an instruction to force the servo motor 6 to drive the ball screw 3 to do rotary motion, and drives the connecting rods 2 (comprising the first connecting rod 2-1, the second connecting rod 2-2 and the third connecting rod 2-3) to do rotary motion, and finally drives the translation plate 1 to do plate collecting motion towards the wall plate 8 through the connecting rods 2, and the translation plate 1 is collected into the translation plate collecting groove 10, so that the influence of the damping device on the flow field is reduced, and the authenticity and stability of the flow field acting force applied by a balance or a model are ensured. Before the flow field is required to be shut down, the control system sends out an instruction to enable the servo motor 6 to drive the connecting rod 2 to put the translation plate 1 into a corresponding working position, and then the flow field is closed, so that effective shock absorption during flow field shut down is realized, and impact load caused by a model during flow field shut down is inhibited.
Through multiple tests, compared with the situation that the damping device is not used for a wind tunnel flow field test, the flow field impact load applied to the model at the moment of flow field starting and stopping is reduced by about 40%, the service life of the model is prolonged, and compared with the situation before the damping device is not used, the service life of the model is prolonged by more than 1 time; the accuracy of model data detected by wind tunnel tests is greatly improved, the data obtained by carrying out ten times of detection has little difference, the detected data float is larger when a damping device is not adopted, the difference between the maximum value and the minimum value in the ten times of detection is larger, and the error range exceeds 2%.
Claims (8)
1. The wind tunnel flow field start-stop damping device is characterized by comprising a translation plate (1), a connecting rod (2), a ball screw (3), a linear guide rail (5), a servo motor (6), a box body (7), a wall plate (8) and a sliding block connecting piece (9), wherein the box body (7) is arranged above the wall plate (8), the box body (7) is provided with a side plate and an upper plate, the servo motor (6) is fixed at one end of the side plate of the box body (7), and the servo motor (6) is in shaft connection with the ball screw (3) at the other end of the side plate through a coupler; the linear guide rail (5) is fixed at the lower part of the upper panel of the box body (7), the linear guide rail (5) is positioned above the ball screw (3), the linear guide rail (5) is provided with a sliding block (5-1), the sliding block (5-1) is fixedly provided with a sliding block connecting piece (9), and the sliding block connecting piece (9) is fixedly connected with the ball screw (3) through a nut (3-1); the connecting rod (2) adopts a crank connecting rod structure, one end of the crank connecting rod is connected with the sliding block connecting piece (9) through a hinge, and the other end of the crank connecting rod is connected with the translation plate (1) through a hinge; the translation plate (1) and the wall plate (8) are always kept parallel.
2. The wind tunnel flow field start-stop damping device according to claim 1, wherein the connecting rod (2) comprises a first connecting rod (2-1), a second connecting rod (2-2) and a third connecting rod (2-3), the upper ends of the first connecting rod (2-1) and the second connecting rod (2-2) are connected with the box body (7) through hinges, and the lower ends of the first connecting rod and the second connecting rod are connected with the translation plate (1) through hinges; one end of the third connecting rod (2-3) is connected with the middle part of the crank of the second connecting rod (2-2) through a hinge, and the other end of the third connecting rod (2-3) is connected with the sliding block connecting piece (9) through a hinge.
3. Wind tunnel flow field start-stop damping device according to claim 1 or 2, characterized in that the damping device further comprises a mechanical limiting mechanism (4), wherein the mechanical limiting mechanism (4) is located right below the ball screw (3) and is arranged in parallel with the ball screw (3), and a movable stop block (4-1) is arranged on the mechanical limiting mechanism (4).
4. Wind tunnel flow field start-stop damping device according to claim 2, characterized in that the translation plate (1) is located below the wall plate (8), and the first connecting rod (2-1) and the second connecting rod (2-2) penetrate through the wall plate (8) and are connected with the translation plate (1) below the wall plate (8).
5. Wind tunnel flow field start-stop damping device according to claim 4, characterized in that the lower part of the wall plate (8) is provided with a translation plate receiving groove (10) for storing the translation plate (1).
6. The wind tunnel flow field start-stop damping device according to claim 4, wherein the second connecting rod (2-2), the third connecting rod (2-3), the ball screw (3) and the servo motor (6) form a crank slide block mechanism, the ball screw (3) is driven to do rotary motion through the servo motor (6), and the nut (3-1) on the ball screw (3) drives the second connecting rod (2-2) and the third connecting rod (2-3) to do rotary motion.
7. The wind tunnel flow field start-stop damping device according to claim 4, wherein the translational plate (1), the first connecting rod (2-1), the second connecting rod (2-2) and the box body (7) form a parallel four-connecting rod mechanism, and the translational plate (1) is driven to do circular arc motion by the rotary motion of the first connecting rod (2-1) and the second connecting rod (2-2) with crank structures, so that the translational plate (1) is always kept parallel to the wall plate (8) when doing circular arc motion.
8. The wind tunnel flow field start-stop damping device according to claim 4, wherein the translation plate (1), the first connecting rod (2-1) and the second connecting rod (2-2) are all designed into a peripheral chamfer structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710758682.6A CN107345536B (en) | 2017-08-29 | 2017-08-29 | Wind tunnel flow field start-stop damping device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710758682.6A CN107345536B (en) | 2017-08-29 | 2017-08-29 | Wind tunnel flow field start-stop damping device |
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| CN107345536A CN107345536A (en) | 2017-11-14 |
| CN107345536B true CN107345536B (en) | 2024-01-02 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107764506B (en) * | 2017-11-16 | 2024-03-22 | 中国空气动力研究与发展中心高速空气动力研究所 | Impact-resistant device and method applied to balance in temporary impact type wind tunnel |
| CN111006838B (en) * | 2019-11-29 | 2021-10-01 | 中国航天空气动力技术研究院 | Nested movable wind tunnel collector device |
| CN112985737B (en) * | 2021-01-20 | 2024-01-19 | 中国空气动力研究与发展中心高速空气动力研究所 | Actuating mechanism of auxiliary device for wind tunnel test |
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| CN207145384U (en) * | 2017-08-29 | 2018-03-27 | 成都华远科技有限公司 | A kind of Flow Field in Wind Tunnel start and stop damping device |
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2017
- 2017-08-29 CN CN201710758682.6A patent/CN107345536B/en active Active
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|---|---|---|---|---|
| JPH075066A (en) * | 1993-06-17 | 1995-01-10 | Mitsubishi Heavy Ind Ltd | Rolling regulation device for wind tunnel testing model |
| JP2000356567A (en) * | 1999-06-14 | 2000-12-26 | Japan Science & Technology Corp | Vibration device for testing wind tunnel |
| JP2002147522A (en) * | 2000-11-07 | 2002-05-22 | Ishikawajima Harima Heavy Ind Co Ltd | Vertical direction damping device |
| CN106441779A (en) * | 2015-08-06 | 2017-02-22 | 无锡市羲和科技有限公司 | Apparatus for measuring three-degree-of-freedom dynamic stability parameters of aircraft in high-speed wind tunnel |
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Effective date of registration: 20240104 Address after: 621000 No.6, south section of the Second Ring Road, Fucheng District, Mianyang City, Sichuan Province Patentee after: Institute of High Speed Aerodynamics, China Aerodynamic Research and Development Center Address before: Room 2512, 25th Floor, No. 66 Cuilong Street, Longquan Street, Longquanyi District, Chengdu City, Sichuan Province, 610100 Patentee before: CHENGDU HUAYUAN TECHNOLOGY CO.,LTD. |
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