CN107091724A - A kind of wind tunnel model gravity adjusting device - Google Patents
A kind of wind tunnel model gravity adjusting device Download PDFInfo
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- CN107091724A CN107091724A CN201710494660.3A CN201710494660A CN107091724A CN 107091724 A CN107091724 A CN 107091724A CN 201710494660 A CN201710494660 A CN 201710494660A CN 107091724 A CN107091724 A CN 107091724A
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- 230000005484 gravity Effects 0.000 title claims abstract description 59
- 230000007246 mechanism Effects 0.000 claims description 25
- 238000009434 installation Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000003068 static effect Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect 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
- 238000013461 design Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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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
- G01M9/02—Wind tunnels
- G01M9/04—Details
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- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention discloses a kind of wind tunnel model gravity adjusting device, belong to model in wind tunnel technical field, the device includes support (1), is connected with wind tunnel model；Sliding equipment (2), two ends are fixed on the support (1), and are connected with wind tunnel model bearing (6)；Rotary part (3), its one end is limited on the support (1) by limiting component, the relatively described support (1) of the rotary part (3) is rotated, and the other end screws in driving part (4)；Driving part (4) is connected with the rotary part (3), and is fixedly connected with the sliding equipment (2) or wind tunnel model bearing (6)；When the rotary part (3) is rotated, wind tunnel model is driven to move by the support (1), to adjust the virtual center of gravity position of wind tunnel model.The present invention realizes continuously adjusting for wind tunnel model virtual center of gravity position；Wind tunnel model need not be reinstalled by changing virtual center of gravity position every time, save time and manpower.
Description
Technical Field
The invention relates to the technical field of wind tunnel test models, in particular to a gravity center adjusting device for a wind tunnel model.
Background
The wind tunnel virtual flight test is a wind tunnel test in which the aircraft performs simulated flight around three rotational degrees of freedom of gravity in a wind tunnel, and the maneuvering motion of the aircraft is simulated by manipulating a control surface so as to explore a pneumatic/motion coupling mechanism of the aircraft. The test needs to complete the installation work of the airplane wind tunnel model and the three-degree-of-freedom device, and the adjustment of the longitudinal static stability margin of the airplane wind tunnel model can be realized by changing the longitudinal installation position (namely the virtual gravity center position) of the wind tunnel model.
At present, the means for adjusting the front and rear installation positions of a wind tunnel model on a gravity center adjusting device of the wind tunnel model mainly comprise two methods:
the wind tunnel model is installed on a mounting frame, fixing blocks are arranged at two ends of the mounting frame, bolt holes are formed in the fixing blocks, the wind tunnel model virtual center of gravity position is tested as required, corresponding fixing holes are formed in two ends of a wind tunnel model support, the bolt holes in the fixing blocks at two ends of the mounting frame are aligned with different fixing holes in the wind tunnel model support, the wind tunnel model is fixed in different positions, and the wind tunnel model virtual center of gravity position is adjusted.
This kind of technical scheme according to bolt hole location has two problems at present:
1. the virtual center of gravity position of the wind tunnel model cannot be continuously adjusted;
2. changing the virtual center of gravity position each time requires reinstalling the wind tunnel model, which consumes time and labor.
And secondly, the front and back movement of the wind tunnel model is realized through an adjusting mechanism consisting of a gear motor and a driving lead screw, and the driving lead screw does not have a self-locking function, only can play a role in front and back adjustment and cannot bear the load in the movement direction of the mechanism, and the load in the movement direction of the mechanism can only be borne by the gear motor. Meanwhile, although the solution realizes the forward and backward movement of the wind tunnel model, the forward and backward movement distance cannot be accurately measured.
Therefore, it is necessary to design a device for adjusting the center of gravity of a wind tunnel model to solve the above problems in the prior art.
Disclosure of Invention
The invention aims to provide a wind tunnel model gravity center adjusting device, which solves the problems that the gravity center position of a wind tunnel model in a wind tunnel test can not be continuously adjusted, the load along the motion direction of a mechanism can not be born, and the moving distance can not be measured.
In order to solve the above technical problem, the present invention provides a wind tunnel model gravity center adjusting device, comprising: the bracket is connected with the wind tunnel model; the two ends of the sliding mechanism are respectively fixed at the two ends of the bracket and are connected with the wind tunnel model support; one end of the rotating component is limited on the bracket through a limiting component, so that the rotating component does rotating motion relative to the bracket, and the other end of the rotating component is screwed into the driving component; the driving component is connected with the rotating component and is fixedly connected with the sliding mechanism or the wind tunnel model support; when the rotating part rotates, the rotating part drives the support to move, and the support drives the wind tunnel model to move so as to adjust the virtual gravity center position of the wind tunnel model.
Further, the stent includes: the mounting rack is connected with the wind tunnel model; the two mounting seats are respectively arranged at two ends of the mounting frame and fixedly connected with the mounting frame, and at least one of the mounting seats is provided with a hole for mounting the rotating part.
Further, the mounting seat comprises a fixed block and a mounting block; the fixed block is fixedly connected with the mounting rack; the mounting block is fixedly connected with the fixed block, and is provided with a mounting hole for mounting the sliding rail; at least one of the mounting blocks is provided with a hole for mounting the rotating component.
Further, the limiting component is a check ring, and the check ring is arranged on the two sides of the hole of the mounting seat for mounting the rotating component.
Further, the slide mechanism includes: the sliding block is fixedly connected with the wind tunnel model support; and the sliding rail penetrates through the sliding block, two ends of the sliding rail are respectively connected with the mounting seat, and the sliding rail slides relative to the sliding block.
Further, the slider includes: a sliding part and a connecting part which are vertically connected with each other; the sliding part is provided with a sliding hole matched with the sliding rail along the thickness direction of the sliding part; the connecting part is fixedly connected with the wind tunnel model support.
Furthermore, the slide rail is two, and parallel distribution is in two between the mount pad.
Furthermore, the number of the sliding parts and the connecting parts is four, and each sliding part is connected with each connecting part; or the number of the sliding parts is four, the number of the connecting parts is two, and every two sliding parts are connected with every connecting part; or the number of the sliding parts is four, the number of the connecting parts is one, and the four sliding parts are connected with the connecting parts.
Further, the rotating member is a threaded rod.
Further, the driving member is provided with a hole in a thickness direction to be fitted with the rotating member.
Further, the wind tunnel model gravity center adjusting device further comprises: and the scale is arranged along the axial direction of the rotating part, and at least one end of the scale is fixedly connected with the bracket and used for measuring the moving distance of the mounting frame, namely the moving distance of the wind tunnel model.
Compared with the prior art, the invention has the beneficial effects that:
the wind tunnel model gravity center adjusting device realizes the front and back continuous change of the virtual gravity center of the wind tunnel model by utilizing the combination of the sliding mechanism, the rotating component and the driving component, and realizes the continuous adjustment of the virtual gravity center position of the wind tunnel model; the wind tunnel model does not need to be reinstalled when the virtual gravity center position is changed every time, and time and labor are saved. The invention utilizes the self-locking characteristic of the threaded rod and can bear the load along the movement direction of the mechanism. The invention is also provided with a scale which can accurately measure the moving distance of the wind tunnel model. Meanwhile, the invention also has the advantages of high precision, low cost, easy realization and the like.
Drawings
FIG. 1 is a schematic representation of a prior art wind tunnel model configuration;
FIG. 2 is a schematic structural diagram of a gravity center adjusting device of a wind tunnel model in the prior art;
FIG. 3 is a schematic structural view of a prior art remotely controlled linear actuator element for an adjustable assembly of a wind tunnel model;
fig. 4 is a schematic structural diagram of a gravity center adjusting device for a wind tunnel model according to a first embodiment of the present invention.
In the figure, 1, a bracket, 11, a mounting frame, 12, a first mounting seat, 12a, a fixed block, 12b, a mounting block, 13, a second mounting seat, 13a, a fixed block, 13b, a mounting block, 2, a sliding mechanism, 21, a sliding block, 21a, a sliding part, 21b, a connecting part, 22, a sliding rail, 3, a rotating part, 4, a driving part, 5, a scale, 6 and a wind tunnel model support.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention.
Before describing the center of gravity adjusting device for a wind tunnel model provided by the invention in detail, two technical solutions in the prior art are introduced first.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a wind tunnel model in the prior art, and a circle is drawn in the diagram to show an installation position of the wind tunnel model.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a gravity center adjusting device of a wind tunnel model in the prior art.
The technical means who adopts is to install the wind-tunnel model on the mounting bracket, and the mounting bracket both ends set up the fixed block, set up the bolt hole on the fixed block, the virtual focus position of wind-tunnel model who tests as required sets up corresponding fixed orifices at wind-tunnel model support both ends, through the bolt hole on the fixed block of mounting bracket both ends and the wind-tunnel model support on different fixed orifices alignment be connected, fix the wind-tunnel model in different positions, realize the virtual focus position of wind-tunnel model and adjust. For example, when the static margin of the front gravity center and the static margin of the rear gravity center of the wind tunnel model need to be tested, 2 rows of fixing holes need to be arranged on a wind tunnel model support; when 3 kinds of static stability margins are to be tested, 3 rows of fixing holes are arranged on the wind tunnel model support.
This kind of technical scheme according to bolt hole location has two problems at present:
1. the virtual center of gravity position of the wind tunnel model cannot be continuously adjusted;
2. changing the virtual center of gravity position of the wind tunnel model each time requires reinstallation of the wind tunnel model, which consumes time and labor.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a remote control linear actuator of an adjustable assembly for a wind tunnel model in the prior art.
The technical scheme is that the adjusting mechanism is composed of a gear motor and a driving screw rod, the driving screw rod is connected to the gear motor through a chain, and a nut for moving a push rod is arranged on the driving screw rod to realize the front and back movement of the wind tunnel model. The driving screw rod (c) has no self-locking function, can only play a role in forward and backward adjustment, and cannot bear the load along the movement direction of the mechanism, and the load along the movement direction of the mechanism can only be borne by the gear motor (i). Meanwhile, although the solution realizes the forward and backward movement of the wind tunnel model, the forward and backward movement distance cannot be accurately measured.
Example one
Fig. 4 is a device for adjusting the center of gravity of a wind tunnel model according to a first embodiment of the present invention.
Referring to fig. 4, in this embodiment, a center of gravity adjusting device for a wind tunnel model includes: support 1, slide mechanism 2, rotary part 3, drive component 4.
In this embodiment, the support 1 is connected with the wind tunnel model, the support 1 includes an installation frame 11, and installation bases 12 and 13 installed at two ends of the installation frame 11, the installation bases 12 and 13 are fixedly connected with the installation frame 11 through fasteners, and at least one installation base 12 or 13 is provided with a hole for installing the rotating part 3.
The support 1 is connected with the wind tunnel model, and actually, two ends of the mounting frame 11 are connected with the main force bearing structure frame of the wind tunnel model and fixed through fasteners, so that the wind tunnel model is fixed on the mounting frame 11. The connection of the mounting frame 11 and the main bearing structure frame of the wind tunnel model provides local structure reinforcement for the wind tunnel model, and the longitudinal and lateral bending resistance at the connection position of the airplane is greatly improved.
When the rotating part 3 rotates, the rotating part 3 drives the mounting frame 11 to move, so that the wind tunnel model is driven to move, and the purpose of continuously adjusting the virtual gravity center position of the wind tunnel model is achieved.
The length of the mounting rack 11 is adaptively adjusted according to the adjustment range of the center of gravity position of the wind tunnel model, so that the length of the mounting rack 11 can meet the adjustment range of the center of gravity position of the wind tunnel model.
For convenience of description, in the present embodiment, two mounting seats are named as: a first mounting seat 12 and a second mounting seat 13, but the invention is not limited thereto.
The first mounting seat 12 is mounted at one end of the mounting bracket 11 by a fastener, and the second mounting seat 13 is mounted at the other end of the mounting bracket 11 by a fastener.
In the present embodiment, the first mounting seat 12 is provided with a hole for mounting the rotating member 3. However, the present invention is not limited to this, and the second mounting base 13 may be provided with a hole for mounting the rotating member 3.
The first mount 12 includes: a fixed block 12a and a mounting block 12 b; the fixed block 12a is fixedly connected with the mounting frame 11, and optionally, the fixed block 12a and the mounting frame 11 are integrally formed; the fixed block 12a is provided with a bolt hole for fixing the mounting block 12 b; the mounting block 12b is provided with a fixing hole for connecting with the fixing block 12a and is fixedly connected with the fixing block 12a through a fastener; the mounting block 12b is also provided with mounting holes for mounting the slide rail 22 and holes for mounting the rotating member 3.
The second mount 13 includes: a fixed block 13a and a mounting block 13 b; the fixed block 13a is fixedly connected with the mounting frame 11, and optionally, the fixed block 13a and the mounting frame 11 are integrally formed; the fixed block 13a is provided with a bolt hole for fixing the mounting block 13 b; the mounting block 13b is provided with a fixing hole for connecting with the fixing block 13a and is fixedly connected with the fixing block 13a through a fastener; the mounting block 13b is further provided with a mounting hole for mounting the slide rail 22.
And two ends of the sliding mechanism 2 are respectively fixed at two ends of the bracket 1 and are connected with the wind tunnel model support 6 through fasteners.
In the present embodiment, the slide mechanism 2 includes: a slide 21 and a slide rail 22.
And the sliding block 21 is fixedly connected with the wind tunnel model support 6 through a fastener.
The slider 21 includes: the wind tunnel model support comprises a sliding part 21a and a connecting part 21b which are vertically connected with each other, wherein a sliding hole matched with the sliding rail 22 is formed in the sliding part 21a along the thickness direction of the sliding part, the shape of the sliding hole is matched with the cross section shape of the sliding rail 22, and the connecting part 21b is fixedly connected with the wind tunnel model support 6 through a fastener.
Alternatively, the shapes of the sliding portion 21a and the connecting portion 21b include, but are not limited to, rectangular parallelepiped.
In this embodiment, the number of the sliders 21 is two, that is, the number of the sliding portions 21a is four, the number of the connecting portions 21b is two, and each two sliding portions 21a are connected to each connecting portion 21b, but the invention is not limited thereto.
And the sliding rail 22 penetrates through the sliding block 21, one end of the sliding rail is connected with the first mounting seat 12, the other end of the sliding rail is connected with the second mounting seat 13, and the sliding rail 22 slides relative to the sliding block 21.
In this embodiment, the number of the slide rails 22 is two, and the two slide rails are distributed in parallel between the first mounting seat 12 and the second mounting seat 13, but the invention is not limited thereto.
Alternatively, the cross-section of the slide rail 22 includes, but is not limited to, circular.
Optionally, the slide rail 22 is made of a stainless steel material, has high strength, can bear the normal aerodynamic load of the wind tunnel model, and transfers the load from the two main load-bearing structure frames of the wind tunnel model to the wind tunnel model support 6 through shearing force, and the generated bending moment is borne by the slide rail 22 itself.
In this embodiment, the sliding block 21 and the sliding rail 22 are not only used for adjusting the gravity center position of the wind tunnel model, but also used for supporting the wind tunnel model.
One end of the rotating component 3 is limited on the first mounting seat 12 of the bracket 1 through a limiting component, and the other end is screwed into the driving component 4.
Optionally, the limiting component is a retainer ring, and is disposed on two sides of the hole on the first mounting seat 12 for mounting the rotating component 3.
Alternatively, the rotating member 3 is a threaded rod. Preferably, the rotating member 3 is a plain coarse threaded rod.
In this embodiment, the retainer ring is used to limit the threaded rod, so that the threaded rod can freely rotate on the first mounting seat 12, but cannot move in the axial direction.
In this embodiment, the threaded rod is used to provide longitudinal adjustment and fixation for the wind tunnel model. The longitudinal pneumatic load resistance of the wind tunnel model is borne by the threaded rod, and the common coarse thread threaded rod has a self-locking characteristic, so that the relative movement between the common coarse thread threaded rod and the driving part 4 can be avoided when the common coarse thread threaded rod bears the axial load.
And a driving member 4 connected to the rotating member 3 and connected to the slide mechanism 2 or the wind tunnel model support 6. The driving member 4 is provided with a hole in the thickness direction to be fitted to the rotating member 3.
When the driving part 4 is connected with the sliding mechanism 2, the driving part 4 is actually connected with the sliding block 21, and alternatively, the connection between the driving part 4 and the sliding block 21 can be a fixed connection or an integral molding.
When the driving component 4 is connected with the wind tunnel model support 6, it can be fixed by a fastener.
Alternatively, the driving part 4 includes, but is not limited to, a rectangular parallelepiped.
In this embodiment, the device for adjusting the center of gravity of the wind tunnel model further includes: and the scale 5 is arranged along the axial direction of the rotating part 3 and is used for measuring the moving distance of the mounting frame 11, namely the moving distance of the wind tunnel model.
Preferably, the scale 5 may be disposed next to the rotating member 3, and more preferably, may be disposed above the rotating member 3.
Optionally, one end of the scale 5 is fixedly connected with the support 1, and the other end of the scale is suspended, or both ends of the scale are fixedly connected with the support 1.
Optionally, the scale 5 is a ruler and is fixedly connected with the mounting frame 11 of the bracket 1, or is fixedly connected with the first mounting seat 12 of the bracket 1.
Preferably, the cross section of the scale 5 is L-shaped, and the scale is fixedly connected with the mounting rack 11 of the support 1, so that readings from different directions can be conveniently read.
In this embodiment, the fasteners include, but are not limited to, bolts.
Example two
The difference between the present embodiment and the first embodiment is the number and structure of the sliders 21.
In the present embodiment, the number of the sliders 21 is four, that is, the number of the sliding portions 21a and the connecting portions 21b is four, and each sliding portion 21a is connected to each connecting portion 21 b.
The structures and the connection relations of other parts of the wind tunnel model gravity center adjusting device in this embodiment are the same as those in the first embodiment, and are not described herein again.
EXAMPLE III
The difference between the present embodiment and the first embodiment is the number and structure of the sliders 21.
In the present embodiment, the number of the sliders 21 is one, that is, the number of the sliding portions 21a is four, the number of the connecting portions 21b is one, and all of the four sliding portions 21a are connected to the connecting portions 21 b.
The structures and the connection relations of other parts of the wind tunnel model gravity center adjusting device in this embodiment are the same as those in the first embodiment, and are not described herein again.
In summary, the present invention is a further improvement based on the prior art, and the mounting frame 11, the fixing block 12a and the fixing block 13a of the bracket 1 of the present invention are also applicable to a wind tunnel model support structure in the prior art, and the mounting block 12b, the mounting block 13b, the sliding mechanism 2, the rotating component 3 and the driving component 4 of the present invention are removed, so that the bracket 1 can be fixed at different positions of the wind tunnel model support in the prior art by using bolt holes on the fixing block 12a and the fixing block 13a, thereby achieving the function of adjusting the center of gravity of the wind tunnel model in the prior art. Therefore, the wind tunnel model gravity center adjusting device can be suitable for two gravity center adjusting modes, and has great selectivity for experimenters.
As described above, the present invention is directed to protect a wind tunnel model center of gravity adjusting device, which utilizes the combination of a sliding mechanism, a rotating component and a driving component to realize the front and back continuous change of the wind tunnel model virtual center of gravity and realize the continuous adjustment of the wind tunnel model virtual center of gravity position; the wind tunnel model does not need to be reinstalled when the virtual gravity center position is changed every time, and time and labor are saved. The invention also utilizes the self-locking characteristic of the threaded rod to bear the load along the movement direction of the mechanism. The invention is also provided with a scale which can accurately measure the forward and backward movement distance of the wind tunnel model. Meanwhile, the invention also has the advantages of high precision, low cost, easy realization and the like.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. A wind tunnel model gravity center adjusting device is characterized by comprising:
the bracket (1) is connected with the wind tunnel model;
the two ends of the sliding mechanism (2) are respectively fixed at the two ends of the bracket (1) and are connected with the wind tunnel model support (6);
one end of the rotating component (3) is limited on the bracket (1) through a limiting component, so that the rotating component (3) rotates relative to the bracket (1), and the other end of the rotating component is screwed into the driving component (4);
the driving component (4) is connected with the rotating component (3) and is fixedly connected with the sliding mechanism (2) or the wind tunnel model support (6);
when the rotating part (3) rotates, the rotating part (3) drives the support (1) to move, and the support (1) drives the wind tunnel model to move so as to adjust the virtual gravity center position of the wind tunnel model.
2. The wind tunnel model center of gravity adjusting device according to claim 1, wherein the bracket (1) comprises:
the mounting rack (11) is connected with the wind tunnel model;
two mount pads (12, 13), set up respectively the both ends of mounting bracket (11), and with mounting bracket (11) fixed connection, be provided with on at least one in mount pad (12, 13) and be used for installing the hole of rotary part (3).
3. A wind tunnel model centre of gravity adjustment device according to claim 2, wherein the mounting seat (12, 13) comprises:
fixed blocks (12a, 13a) and mounting blocks (12b, 13 b);
the fixing blocks (12a and 13a) are fixedly connected with the mounting rack (11);
the mounting blocks (12b and 13b) are fixedly connected with the fixing blocks (12a and 13a), and mounting holes for mounting the sliding rails (22) are formed in the mounting blocks;
at least one of the mounting blocks (12b, 13b) is provided with a hole for mounting the rotating member (3).
4. The wind tunnel model gravity center adjusting device according to claim 2, wherein the limiting component is a retainer ring, and the retainer ring is arranged on the mounting seat (12) at two sides of a hole for mounting the rotating component (3).
5. The wind tunnel model gravity center adjusting device according to claim 1, wherein the sliding mechanism (2) comprises:
the sliding block (21) is fixedly connected with the wind tunnel model support (6);
and the sliding rail (22) penetrates through the sliding block (21), two ends of the sliding rail are respectively connected with the mounting seats (12 and 13), and the sliding rail (22) slides relative to the sliding block (21).
6. The wind tunnel model gravity center adjusting device according to claim 5, wherein the slider (21) comprises:
a sliding part (21a) and a connecting part (21b) which are vertically connected with each other;
the sliding part (21a) is provided with a sliding hole matched with the sliding rail (22) along the thickness direction;
the connecting part (21b) is fixedly connected with the wind tunnel model support (6).
7. The wind tunnel model gravity center adjusting device according to claim 5, wherein the number of the slide rails (22) is two, and the two slide rails are distributed between the two mounting seats (12, 13) in parallel.
8. The wind tunnel model gravity center adjusting device according to claim 7, wherein the number of the sliding portions (21a) and the connecting portions (21b) is four, and each sliding portion (21a) is connected with each connecting portion (21 b);
or,
the number of the sliding parts (21a) is four, the number of the connecting parts (21b) is two, and every two sliding parts (21a) are connected with each connecting part (21 b);
or,
the number of the sliding parts (21a) is four, the number of the connecting parts (21b) is one, and the four sliding parts (21a) are all connected with the connecting parts (21 b).
9. The wind tunnel model center of gravity adjusting device according to claim 1, wherein the rotating member (3) is a threaded rod.
10. The wind tunnel model center of gravity adjusting device according to claim 1, wherein the driving member (4) is provided with a hole in a thickness direction thereof to be fitted with the rotating member (3).
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| CN201710494660.3A CN107091724B (en) | 2017-06-26 | 2017-06-26 | A kind of wind tunnel model gravity adjusting device |
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| CN109164042A (en) * | 2018-10-30 | 2019-01-08 | 叶锦程 | The weight gain device of airport surface friction coefficient vehicle |
| CN109164042B (en) * | 2018-10-30 | 2020-12-04 | 温州高伟通工业设计有限公司 | Weight increasing device of aerodrome pavement friction coefficient vehicle |
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| Publication number | Publication date |
|---|---|
| CN107091724B (en) | 2019-10-15 |
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