CN113353287B - Darkroom test device and paddle - Google Patents
Darkroom test device and paddle Download PDFInfo
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- CN113353287B CN113353287B CN202110788736.XA CN202110788736A CN113353287B CN 113353287 B CN113353287 B CN 113353287B CN 202110788736 A CN202110788736 A CN 202110788736A CN 113353287 B CN113353287 B CN 113353287B
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- 238000012360 testing method Methods 0.000 title claims abstract description 105
- 239000011358 absorbing material Substances 0.000 claims abstract description 30
- 230000007246 mechanism Effects 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/60—Testing or inspecting aircraft components or systems
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- Aviation & Aerospace Engineering (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a blade for darkroom testing, which comprises a blade section and a blade shell, wherein the blade shell is sleeved outside the blade section, the outside of the blade shell can be coated with a wave-absorbing material, and the blade shell is detachably connected with the blade section. According to the paddle for testing the darkroom, the wave-absorbing materials with different electromagnetic parameters are uniformly coated on the paddle shell according to requirements, and the paddle shell is sleeved outside the paddle section, so that the RCS of the paddle is conveniently tested; in addition, the number of the blade shells is multiple sections, and the blade shells coated with different wave-absorbing materials can be arranged and combined to test the influence of different wave-absorbing materials on the RCS of the blade when the different wave-absorbing materials are positioned at different positions of the blade. Meanwhile, the invention also provides a device for testing the darkroom, which comprises two groups of supporting mechanisms and the darkroom testing paddle, wherein the two groups of supporting mechanisms are arranged at two ends of the darkroom testing paddle, and the supporting mechanisms can support and fix the darkroom testing paddle and improve the stability of the testing paddle.
Description
Technical Field
The invention relates to the technical field of aircrafts and peripheral supporting facilities thereof, in particular to a darkroom testing device and a paddle.
Background
The armed helicopter is widely applied to modern battlefields by virtue of excellent low-altitude hitting capability, and the radar technology for detecting and identifying the helicopter target is gradually improved, which puts higher requirements on the stealth performance of the helicopter radar. An important index for measuring the stealth capability of the helicopter Radar is RCS (Radar Cross Section, RCS for short), and the larger the RCS is, the worse the stealth capability of the helicopter is.
In the stealth design of a helicopter, a plane splicing structure is usually adopted on the surface of a helicopter body to reduce RCS, and the rotor is difficult to design into a plane structure due to the strict aerodynamic requirement of the rotor, so that the RCS is reduced by coating a wave-absorbing material on the surface of a blade. Two common methods for coating wave-absorbing materials on the surface of the blade are as follows: firstly, the wave-absorbing material is directly and uniformly sprayed on the surface of the blade; and secondly, a special adhesive tape made of wave-absorbing materials is adhered to the surface of the blade. However, the two methods are difficult to test the blade by coating different wave-absorbing materials, or the original coated materials are cleaned and then the aerodynamic appearance of the blade is possibly damaged, and the combined reduction effect of coating a plurality of wave-absorbing materials on different positions of the blade is difficult to research. Meanwhile, the type and distribution condition of the wave-absorbing material, the aspect ratio of the blades, the incidence angle of the blades in the flying process and the like can influence the size of the RCS to a certain extent, all the factors need to be considered in the design process of the stealth blades and a microwave darkroom test is carried out, but the test process is repeated and complicated, the operation difficulty is high, and the test work efficiency is reduced.
Therefore, how to change the current situation that the RCS test of the blade has low working efficiency in the prior art becomes a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a device for testing a darkroom and a paddle, which are used for solving the problems in the prior art and improving the working efficiency of RCS testing of the paddle.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a paddle for a darkroom test, which comprises a paddle section and a paddle shell, wherein the paddle shell is sleeved outside the paddle section, the outside of the paddle shell can be coated with a wave-absorbing material, and the paddle shell is detachably connected with the paddle section;
the number of the blade shells is multiple sections, and the sum of the lengths of the multiple sections of the blade shells is consistent with the length of the blade sections.
Preferably, the number of the blade sections is multiple sections, and the adjacent blade sections are detachably connected.
Preferably, adjacent blade sections are connected in a plugging manner.
Preferably, a connecting beam is arranged at one end of the blade section, and a connecting hole matched with the connecting beam is formed in the other end of the blade section.
Preferably, the number of the connecting beams and the connecting holes is two, and the connecting beams correspond to the connecting holes one to one.
Preferably, the number of the paddle sections is three, and the three paddle sections are connected in sequence.
The invention also provides a device for testing the darkroom, which comprises the paddle for testing the darkroom and also comprises two groups of supporting mechanisms, wherein the two groups of supporting mechanisms are arranged at two ends of the paddle for testing the darkroom, the supporting mechanisms can support and fix the paddle for testing the darkroom, and the supporting mechanisms are detachably connected with the paddle for testing the darkroom.
Preferably, the supporting mechanism comprises a supporting frame and a fixing screw rod, the fixing screw rod is in threaded connection with the supporting frame, and the fixing screw rod can abut against the blade for the darkroom test; the quantity of the fixing screw rods is four, and the paddle for testing the darkroom is positioned in the rectangular inner part surrounded by the four fixing screw rods.
Preferably, a gasket is arranged at one end of the fixed screw rod, which is abutted against the darkroom test paddle; the support frame is of a frame structure.
Preferably, the bottom of the support frame is provided with a base, and the bottom area of the base is larger than the sectional area of the joint of the base and the support frame.
Compared with the prior art, the invention has the following technical effects: the paddle for the darkroom test comprises a paddle section and a paddle shell, wherein the paddle shell is sleeved outside the paddle section, wave-absorbing materials can be coated outside the paddle shell, and the paddle shell is detachably connected with the paddle section; the number of the blade shells is multiple sections, and the sum of the lengths of the multiple sections of blade shells is consistent with the length of the blade sections.
The paddle for testing the darkroom comprises a paddle section and a paddle shell which are detachably connected, wave-absorbing materials with different electromagnetic parameters are uniformly coated on the paddle shell according to requirements, and the paddle shell is sleeved outside the paddle section, so that the RCS of the paddle is conveniently tested; in addition, the number of the blade shells is multiple, the blade shells coated with different wave-absorbing materials can be arranged and combined to test the influence of different wave-absorbing materials on RCS (radar cross section) of the blades when the blades are located at different positions.
Meanwhile, the invention also provides a device for testing the darkroom, which comprises two groups of supporting mechanisms and the darkroom testing paddle, wherein the two groups of supporting mechanisms are arranged at two ends of the darkroom testing paddle and can support and fix the darkroom testing paddle, and the supporting mechanisms are detachably connected with the darkroom testing paddle. According to the device for testing the darkroom, the supporting mechanism is utilized to support the paddle for testing the darkroom, so that the stability of the paddle to be tested is improved, a convenient condition is provided for RCS testing of the paddle, the testing difficulty is further reduced, and the testing work efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural view of a device and a blade for darkroom testing according to the present invention;
FIG. 2 is a schematic view of the device for darkroom testing and the change of the attack angle of the paddle during the testing of the paddle according to the present invention;
FIG. 3 is a schematic view of a blade shell of a blade for darkroom testing according to the present invention;
FIG. 4 is a schematic structural view of a blade segment in an embodiment of a blade for darkroom testing according to the present invention;
FIG. 5 is a schematic view of the connection between the blade section and the blade shell of the blade for darkroom testing according to the present invention;
FIG. 6 is a comparative RCS diagram of blades under different working conditions in the darkroom test device and the embodiment of the blades of the present invention;
wherein, 1 is the paddle section, 2 is the paddle shell, 3 is the tie-beam, 4 is the connecting hole, 5 is supporting mechanism, 6 is the support frame, 7 is fixing screw, 8 is the gasket, 9 is the base.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a device for testing a darkroom and a paddle, which are used for solving the problems in the prior art and improving the working efficiency of RCS (Radar Cross section) testing of the paddle.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
Referring to fig. 1 to 6, fig. 1 is a schematic structural diagram of a device and a blade for dark room testing of the present invention, fig. 2 is a schematic structural diagram of a blade attack angle changing in a test of the device and the blade for dark room testing of the present invention, fig. 3 is a schematic structural diagram of a blade shell of the blade for dark room testing of the present invention, fig. 4 is a schematic structural diagram of a blade section in an embodiment of the blade for dark room testing of the present invention, fig. 5 is a schematic connection diagram of the blade section and the blade shell of the blade for dark room testing of the present invention, and fig. 6 is a comparison diagram of RCS of the blade under different working conditions in the embodiment of the device and the blade for dark room testing of the present invention.
The invention provides a paddle for darkroom testing, which comprises a paddle section 1 and a paddle shell 2, wherein the paddle shell 2 is sleeved outside the paddle section 1, the outside of the paddle shell 2 can be coated with a wave-absorbing material, and the paddle shell 2 is detachably connected with the paddle section 1;
the blade shells 2 are in multiple sections, and the sum of the lengths of the multiple sections of blade shells 2 is consistent with the length of the blade section 1.
The paddle for the darkroom test comprises a paddle section 1 and a paddle shell 2 which are detachably connected, wave-absorbing materials with different electromagnetic parameters are uniformly coated on the paddle shell 2 according to requirements, and the paddle shell 2 is sleeved outside the paddle section 1, so that the paddle RCS can be conveniently tested; in addition, the number of the blade shells 2 is multiple, the blade shells 2 coated with different wave-absorbing materials can be arranged and combined to test the influence of different wave-absorbing materials on the RCS of the blades when the blades are positioned at different positions, the blade shells 2 are arranged, and the blade shells 2 are detachably connected with the blade segments 1, so that the blade test process is simplified, and the test working efficiency is improved.
Wherein, the quantity of paddle section 1 is the multistage, makes things convenient for the installation of paddle shell 2, and adjacent paddle section 1 can be dismantled and connect, and connection can be dismantled to multistage paddle section 1, makes things convenient for the staff to operate.
In this embodiment, adjacent paddle section 1 pegs graft and links to each other, adopts the plug connection mode, and the dismouting is convenient, and convenient operation has greatly improved the simple operation nature.
Specifically, one end of the blade section 1 is provided with a connecting beam 3, the other end of the blade section 1 is provided with a connecting hole 4 matched with the connecting beam 3, and when the multiple blade sections 1 are connected, the connecting beam 3 of the blade section 1 is inserted into the connecting hole 4 of the adjacent blade section 1 so as to realize the sequential connection of the multiple blade sections 1. In the test process, the number of the blade sections 1 can be changed when the aspect ratio of the blade needs to be changed, so that the operation is convenient and fast; in actual operation, the blade sections 1 at two ends can be only provided with a single connecting beam 3 or connecting hole 4, so that the processing difficulty is reduced.
More specifically, the number of the connecting beams 3 and the connecting holes 4 is two, the connecting beams 3 correspond to the connecting holes 4 one by one, and the two groups of connecting beams 3 and the two groups of connecting holes 4 are arranged, so that the rotation between adjacent blade sections 1 is avoided, and the normal test is not influenced; in practical tests, the number of the connecting beams 3 and the connecting holes 4 can be determined according to practical requirements.
In other specific embodiments of the present invention, the number of the paddle sections 1 is three, the three paddle sections 1 are sequentially connected, and in the test process, the gaps between the adjacent paddle sections 1 may be connected by using a double-sided conductive copper foil, so as to reduce interference of the existence of the gaps on RCS characteristics.
The device comprises the paddle for the darkroom test and also comprises two groups of supporting mechanisms 5, wherein the two groups of supporting mechanisms 5 are arranged at two ends of the paddle for the darkroom test, the supporting mechanisms 5 can support and fix the paddle for the darkroom test, and the supporting mechanisms 5 are detachably connected with the paddle for the darkroom test.
According to the device for testing the darkroom, the supporting mechanism 5 is utilized to support the paddle for testing the darkroom, so that the stability of the paddle to be tested is improved, a convenient condition is provided for RCS testing of the paddle, the testing difficulty is further reduced, and the testing work efficiency is improved.
Furthermore, the supporting mechanism 5 comprises a supporting frame 6 and a fixing screw 7, the fixing screw 7 is in threaded connection with the supporting frame 6, and the fixing screw 7 can abut against the blade for darkroom testing; in each group of supporting mechanism 5, the number of the fixing screw rods 7 is four, the paddle for darkroom test is positioned in a rectangle formed by the four fixing screw rods 7, the fixing screw rods 7 are respectively positioned in the upper, lower, left and right directions of the paddle to be tested, the paddle to be tested is fixed in an all-around manner, the stability of the paddle to be tested in the testing process is improved, and the testing accuracy is improved.
In order to avoid the fixed screw 7 from damaging the blade to be tested and influencing the test result as much as possible, a gasket 8 is arranged at one end of the fixed screw 7, which is abutted against the blade for darkroom test, and the gasket 8 is abutted against the blade shell 2, so that the wave-absorbing material coated on the surface of the blade shell 2 is prevented from being damaged, and the test accuracy is improved; in addition, the support frame 6 is of a frame structure, so that the influence on the paddle to be tested is reduced as much as possible, and the smooth test and the test effectiveness are ensured. Loosening the four fixing screws 7, manually holding the paddle to be tested in a spatial horizontal position, and then tightening the four fixing screws 7 to ensure that the gasket 8 is slightly attached to the surface of the paddle and does not shift, wherein attention needs to be paid to the coating state of the wave-absorbing material of the paddle to be tested in the tightening process; if the attack angle of the paddle to be tested needs to be changed, the paddle to be tested is held by hands, the attack angle is manually measured, then the fixing screw 7 is screwed down, and then the test is carried out.
It should also be noted that the base 9 is arranged at the bottom of the supporting frame 6, the bottom area of the base 9 is larger than the sectional area of the joint of the base 9 and the supporting frame 6, and the base 9 is arranged at the bottom of the supporting frame 6, so that the structural stability and the test safety factor of the device are further improved.
The device and paddle for testing darkroom according to the present invention will be further explained by the following specific testing process.
A paddle model of 5 working conditions is constructed by adopting a paddle section 1 of an NACA0012 airfoil, wherein the chord length of the paddle section 1 is 400mm, and the extension length is 500 mm:
(1) the three-section type paddle is made of metal materials and non-coating wave-absorbing materials, the aspect ratio is 3.75:1, and the attack angle is 0 degree;
(2) the three-section type paddle has the aspect ratio of 3.75:1, and the paddle section 1 is sequentially coated with the relative dielectric constant epsilon with the thickness of 1mm from left to rightr12.75-j.0.14, relative permeability mur1.20-j.0.88, relative dielectric constant epsilonr100.58-j. 150.74, relative permeability murMaterial two and relative dielectric constant epsilon of 1.49-j.1.67r9.40-j.3.79, relative permeability mur1 material three, angle of attack 0 °;
(3) the four-section type paddle is made of metal materials with an aspect ratio of 5:1, is not coated with wave-absorbing materials and has an attack angle of 0 degree;
(4) the four-section type paddle is made of metal materials with an aspect ratio of 5:1, is not coated with wave-absorbing materials and has an attack angle of 10 degrees;
(5) and the four-section type paddle has an aspect ratio of 5:1, the left two sections of paddles are coated with a first material with the thickness of 1mm, the right two sections of paddles are coated with a second material with the thickness of 1mm, and the attack angle is 10 degrees.
RCS distribution of the 5 models within the range of 1-180 degrees in horizontal direction and 10 degrees in step under the irradiation of 10GHz and vertical polarization radar waves is calculated and shown in figure 6. It can be seen that the RCS of the blade models under 5 working conditions are different, the aspect ratio and the attack angle of the blade and the type and the position of the wave-absorbing material coated on the blade all have certain influence on the RCS of the whole blade, and the factors need to be considered in the stealth design of the blade. According to the darkroom test device and the blade, the aspect ratio of the blade can be changed by connecting different numbers of blade sections 1, the attack angle of the blade can be changed by adjusting the clamping position of the fixing screw 7, different wave-absorbing materials are coated on the surface of the blade shell 2, the blade shell 2 is combined and matched, and then the types and the coating positions of the wave-absorbing materials can be adjusted by connecting the blade shell 2 with the blade sections 1 in a bolt manner.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. The utility model provides a device is used in darkroom test, includes that darkroom test uses paddle, its characterized in that: the paddle for the darkroom test comprises a paddle section and a paddle shell, wherein the paddle shell is sleeved outside the paddle section, the outside of the paddle shell can be coated with a wave-absorbing material, and the paddle shell is detachably connected with the paddle section;
the number of the blade shells is multiple sections, and the sum of the lengths of the multiple sections of the blade shells is consistent with the length of the blade sections;
the darkroom test device further comprises two groups of support mechanisms, the two groups of support mechanisms are arranged at two ends of the darkroom test paddle and can support and fix the darkroom test paddle, and the support mechanisms are detachably connected with the darkroom test paddle;
The supporting mechanism comprises a supporting frame and a fixing screw rod, the fixing screw rod is in threaded connection with the supporting frame, and the fixing screw rod can abut against the blade for darkroom testing; the quantity of the fixing screw rods is four, and the paddle for testing the darkroom is positioned in the rectangular inner part surrounded by the four fixing screw rods.
2. The device for testing a darkroom of claim 1, wherein: the quantity of paddle section is the multistage, and is adjacent the paddle section can be dismantled and connect.
3. The device for testing a darkroom of claim 2, wherein: and adjacent blade sections are connected in an inserting manner.
4. The device for testing a dark room according to claim 3, wherein: one end of the paddle section is provided with a connecting beam, and the other end of the paddle section is provided with a connecting hole matched with the connecting beam.
5. The device for testing a dark room according to claim 4, wherein: the number of the connecting beams and the connecting holes is two, and the connecting beams correspond to the connecting holes one to one.
6. The device for testing a dark room according to claim 2, wherein: the number of the paddle sections is three, and the three paddle sections are connected in sequence.
7. The device for testing a darkroom of claim 1, wherein: a gasket is arranged at one end of the fixed screw, which is abutted against the blade for darkroom testing; the support frame is of a frame structure.
8. The device for testing a darkroom of claim 1, wherein: the bottom of the support frame is provided with a base, and the bottom area of the base is larger than the sectional area of the joint of the base and the support frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110788736.XA CN113353287B (en) | 2021-07-13 | 2021-07-13 | Darkroom test device and paddle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110788736.XA CN113353287B (en) | 2021-07-13 | 2021-07-13 | Darkroom test device and paddle |
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| Publication Number | Publication Date |
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| CN113353287A CN113353287A (en) | 2021-09-07 |
| CN113353287B true CN113353287B (en) | 2022-06-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113928553B (en) * | 2021-11-01 | 2022-09-02 | 南京航空航天大学 | Blade structure and darkroom testing method |
| CN114987738A (en) * | 2022-05-31 | 2022-09-02 | 中国人民解放军总参谋部第六十研究所 | Blade with RCS reinforcement structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US2713393A (en) * | 1952-06-10 | 1955-07-19 | Isacco Vittorio | Telescopic blade for rotating wing aircraft |
| KR101483098B1 (en) * | 2013-06-27 | 2015-01-16 | 한국항공우주산업 주식회사 | Apparatus for testing water erosion characteristic |
| GB2526795A (en) * | 2014-06-02 | 2015-12-09 | Vestas Wind Sys As | Wind turbines incorporating radar absorbing material |
| CN104773291A (en) * | 2015-04-08 | 2015-07-15 | 南昌航空大学 | Disc-shaped rotor wing unmanned helicopter |
| ES2613578B1 (en) * | 2015-11-24 | 2018-03-12 | Gamesa Innovation & Technology, S.L. | Wind turbine blade comprising a lightning rod system equipped with radar absorbent material |
| CN108100299A (en) * | 2017-12-01 | 2018-06-01 | 中国直升机设计研究所 | A kind of rotor model blade |
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