Underwater vehicle multi-mast low rcs test vehicle

Abstract

The utility model discloses a kind of underwater vehicle multi-mast low RCS test carriers, test carrier includes test carrier ontology, counterweight block;Test carrier ontology is used to install the photoelectric mast, electronic reconnaissance equipment, radar antenna, communication antenna needing to carry out RCS test;When testing, test carrier ontology bottom surface is supported in the top of foam support, counterweight block is configured to be set on the test ontology upper surface, to adjust barycenter position, make the barycenter of test carrier ontology after photoelectric mast, electronic reconnaissance equipment, radar antenna, communication antenna installation be located within the radius range of being set with the top center of foam support as circle center. It can reduce barycenter, more safety, also solve the problem that foam support top maximum diameter is too small to directly place photoelectric mast, electronic reconnaissance equipment, radar antenna, communication antenna installed on lifting device mast on lifting device mast on foam support and carry out RCS test.

Description

Technical Field

[0001] This utility model belongs to the field of radar cross section testing technology, specifically relating to a multi-mast low RCS test carrier for underwater vehicles. Background Technology

[0002] Currently, the applicant's underwater vehicle design incorporates a multi-mast system, including an optoelectronic mast, electronic reconnaissance equipment, radar antenna, communication antenna, and a lifting mast. Each of these components—the optoelectronic mast, electronic reconnaissance equipment, radar antenna, communication antenna, and lifting mast—is mounted on a corresponding lifting mast. Raising or lowering the lifting mast causes the corresponding equipment on it to rise or fall. The applicant now needs to test the radar cross-section (RCS) of the optoelectronic mast, electronic reconnaissance equipment, radar antenna, communication antenna, and lifting mast under the combined condition of multiple masts being raised simultaneously, after completing the radar stealth design and prototype manufacturing for these components.

[0003] Current RCS testing methods typically involve conducting tests in a microwave anechoic chamber. This requires placing the target on a foam support, usually in a cylindrical shape. To minimize the impact of foam scattering on the target's RCS, the maximum diameter of the foam support's top is generally no more than 1.5 meters, and its maximum load-bearing capacity is generally no more than 2 tons. For airborne vehicles, these foam supports meet the RCS testing requirements. However, the applicant currently faces a problem: when underwater vehicles are operating with multiple masts simultaneously, the maximum distance between the masts of each lifting device and the electro-optical masts, electronic reconnaissance equipment, radar antennas, and communication antennas mounted on them exceeds 1.5 meters. Therefore, it is impossible to directly place all the lifting masts and their mounted electro-optical masts, electronic reconnaissance equipment, radar antennas, and communication antennas together on the foam support for RCS testing. Furthermore, since the lifting mast of an underwater vehicle is a slender cylinder, if it is placed directly on a foam support, the mast's base area is small, and the center of gravity of the mast, along with the electro-optical mast, electronic reconnaissance equipment, radar antenna, or communication antenna mounted on it, is high. When the foam support rotates, the mast and the electro-optical mast, electronic reconnaissance equipment, radar antenna, or communication antenna mounted on it are prone to tipping over, posing a safety hazard. Utility Model Content

[0004] In view of this, the present invention provides a multi-mast low RCS test carrier for underwater vehicles, which solves the technical problems that when the maximum distance between the mast of the lifting device on the underwater vehicle and the photoelectric mast, electronic reconnaissance equipment, radar antenna and communication antenna installed on the mast exceeds 1.5m, it is impossible to directly place it on the existing foam support for RCS testing, and because the bottom area of ​​the lifting device mast is small and the center of gravity is high, it is easy to tip over when the foam support is rotated when it is directly placed on the foam support.

[0005] A multi-mast low RCS test platform for underwater vehicles adopts the following technical solution:

[0006] This includes the test carrier body and the counterweight;

[0007] The test carrier body is used to install the multi-mast equipment that needs to be tested for RCS.

[0008] During testing, the bottom surface of the test carrier body is supported on the top of the foam support, and the counterweight is configured to be set on the upper surface of the test carrier body to adjust the center of gravity position so that the center of gravity of the test carrier body after the multi-mast equipment is installed is within a set radius range with the center of the top of the foam support as the center.

[0009] Furthermore, the test carrier body includes an upper surface and a lower surface, and also includes an upper side surface that surrounds the upper surface to form a ring, and a lower side surface that surrounds the lower surface to form a ring.

[0010] The upper surface of the test carrier body is provided with multiple flange interface grooves for installing the multi-mast equipment.

[0011] The lower surface of the test carrier body is a plane;

[0012] The angle between the upper and lower sides of the test carrier body is 10° to 40°, and a rounded chamfer with a radius of less than 1mm is provided at the connection between the upper and lower sides.

[0013] Furthermore, the flange interface groove is provided with a countersunk hole for mounting the multi-mast equipment using countersunk screws.

[0014] Furthermore, the upper and lower sides of the test carrier body are configured as an integral structure with the test carrier body, or as a substitute wood or rigid foam with aluminum foil skin pasted on the surface.

[0015] Furthermore, when the upper and lower sides of the test carrier body are wood substitutes or rigid foam with aluminum foil skin pasted on the surface, the side of the test carrier body is a C-shaped connector, the clamping side of the connector is connected to the wood substitute or rigid foam, and the upper and lower surfaces of the connector form a smooth transition between the test carrier body and the wood substitute or rigid foam.

[0016] Furthermore, the upper surface of the test carrier body is provided with weight-reducing grooves, so that the test carrier body forms interlaced transverse and longitudinal ribs.

[0017] Furthermore, it also includes aluminum cover plates;

[0018] The aluminum cover plate is used to cover the weight reduction groove and the flange interface groove where the multimast equipment is not installed;

[0019] The gap width between the edge of the aluminum cover plate and the weight-reducing groove and the flange interface groove is less than 0.2 mm, and aluminum foil is provided between the gaps;

[0020] The upper surface of the aluminum cover plate is flush with the upper surface of the test carrier body.

[0021] Furthermore, the surface roughness of the aluminum cover plate is less than 1.6 mm.

[0022] Furthermore, the upper surface of the test carrier body is provided with a plurality of symmetrical lifting point grooves around its perimeter, for lifting the test carrier body and the multi-mast equipment installed on it as a whole to the top of the foam support;

[0023] The hanging point groove is sealed with aluminum foil.

[0024] Beneficial effects:

[0025] 1. This utility model designs a low RCS test carrier, which can first fix the lifting mast of the underwater vehicle and the optoelectronic mast, electronic reconnaissance equipment, radar antenna, and communication antenna installed on the lifting mast to the low RCS test carrier. Then, the low RCS test carrier is suspended on a foam support. Since the low RCS test carrier is at the bottom of the target being tested, the center of gravity can be lowered, which is safer. At the same time, it also solves the problem that the maximum diameter of the top of the foam support (1.5m) is too small, which makes it impossible to directly place the lifting mast and the optoelectronic mast, electronic reconnaissance equipment, radar antenna, and communication antenna installed on the lifting mast on the foam support for RCS testing.

[0026] 2. This utility model provides a low RCS test carrier for multi-mast underwater vehicles. Through measures such as low RCS shape design, application of radar-absorbing materials, aluminum cover plate sealing of grooves, and aluminum foil bonding gaps, it has excellent surface current guiding effect, suppressing specular reflection and traveling wave scattering, and can reduce the average RCS to -22.7 dBm², without affecting the RCS test of the antenna mast under test. Furthermore, the flange interface groove of the low RCS test carrier is compatible with the arrangement of various antenna mast equipment on the underwater vehicle. Figure 1 This effectively simulates the actual installation state of the antenna mast, allowing for more accurate measurement and evaluation of the antenna mast's RCS.

[0027] 3. The low RCS test carrier of this utility model can evaluate the RCS of a single antenna mast under test individually, or evaluate the RCS of multiple antenna masts under test in any combination of working conditions, thus solving the problem of difficulty in evaluating the RCS of multiple antenna masts together.

[0028] 4. The low RCS test carrier of this utility model improves stability during testing by setting multiple weight-reducing grooves and designing lead weights of different sizes in the weight-reducing grooves, so that the total center of gravity of the test carrier and the antenna device under test is located near the center of the foam support. It can make the total weight of the heaviest combination condition 1.77t and the strength safety factor 10.9, which meets the load-bearing requirements of the microwave anechoic chamber foam support and improves the test safety. It can also control the tilt angle of the multi-mast equipment within 0.21°, reducing the influence of the test carrier on the attitude of the multi-mast equipment under test.

[0029] 5. The multi-mast low RCS test carrier of this utility model not only considers the low RCS performance of the test carrier, but also takes into account the requirements of weight, center of gravity, strength, and attitude control of antenna mast equipment in actual use, and can better meet the actual engineering needs.

[0030] 6. The upper side, upper surface, lower side and lower surface of the test carrier of this utility model are seamlessly connected at the joint by rounding the chamfer and the curvature is continuous, thereby reducing the traveling wave scattering caused by surface discontinuity. Attached Figure Description

[0031] Figure 1 A top view of the test carrier body provided by this utility model;

[0032] Figure 2 A bottom view of the test carrier body provided by this utility model;

[0033] Figure 3 A side view of the test carrier body provided by this utility model;

[0034] Figure 4A partial schematic diagram of the upper side surface and the chamfered center of the upper surface of the test carrier body provided by this utility model;

[0035] Figure 5 A schematic diagram of the flange interface groove of the test carrier body provided by this utility model;

[0036] Figure 6 A schematic diagram of the weight reduction groove of the test carrier body provided by this utility model;

[0037] Figure 7 A schematic diagram of the hanging point groove of the test carrier body provided by this utility model;

[0038] Figure 8 A schematic diagram of the layout of a multi-mast equipment under the heaviest combined working conditions for the test carrier body provided by this utility model;

[0039] Figure 9 A schematic diagram of the lead weight provided for this utility model;

[0040] Figure 10 A schematic diagram of the aluminum cover plate provided by this utility model;

[0041] Figure 11 A schematic diagram of the overall test of the test carrier provided by this utility model under the heaviest combination working condition;

[0042] Figure 12 This is a schematic diagram of the structure of the C-shaped connector provided by this utility model;

[0043] Figure 13 The diagram shows the calculated weight and center of gravity of the test carrier provided by this utility model under the heaviest combined working condition.

[0044] Figure 14 The calculation results of the strength safety factor of the test carrier under the heaviest combination working condition provided by this utility model are shown in the figure (in sections). Figure 1 );

[0045] Figure 15 The calculation results of the strength safety factor of the test carrier under the heaviest combination working condition provided by this utility model are shown in the figure (in sections). Figure 2 );

[0046] Figure 16 The calculation results of the strength safety factor of the test carrier under the heaviest combination working condition provided by this utility model are shown in the figure (in sections). Figure 3 );

[0047] Figure 17 The calculation results of the antenna tilt angle under the heaviest combined working condition of the test carrier provided by this utility model are shown in the figure (in sections). Figure 1 );

[0048] Figure 18The calculation results of the antenna tilt angle under the heaviest combined working condition of the test carrier provided by this utility model are shown in the figure (in sections). Figure 2 );

[0049] Figure 19 The calculation results of the antenna tilt angle under the heaviest combined working condition of the test carrier provided by this utility model are shown in the figure (in sections). Figure 3 );

[0050] Figure 20 The X-band average RCS calculation results of the test carrier provided by this utility model (divided into...) Figure 1 );

[0051] Figure 21 The X-band average RCS calculation results of the test carrier provided by this utility model (divided into...) Figure 2 );

[0052] Wherein, 1-first upper side; 2-second upper side; 3-third upper side; 4-fourth upper side; 5-upper surface; 6-first lower side; 7-second lower side; 8-third lower side; 9-fourth lower side; 10-lower surface; 11-first flange interface groove; 12-second flange interface groove; 13-third flange interface groove; 14-fourth flange interface groove; 15-fifth flange interface groove; 16-sixth flange interface groove; 17-first weight reduction groove; 18-second weight reduction groove; 19-third weight reduction groove Groove; 20-Fourth weight-reduction groove; 21-Fifth weight-reduction groove; 22-Sixth weight-reduction groove; 23-Seventh weight-reduction groove; 24-Eighth weight-reduction groove; 25-Ninth weight-reduction groove; 26-Tenth weight-reduction groove; 27-Eleventh weight-reduction groove; 28-Twelfth weight-reduction groove; 29-Thirteenth weight-reduction groove; 30-Fourteenth weight-reduction groove; 31-Fifteenth weight-reduction groove; 32-Sixteenth weight-reduction groove; 33-Seventeenth weight-reduction groove; 34-First hanging point groove; 35-Second hanging point groove; 36-Third hanging point groove; 37-Fourth suspension point groove; 38-First antenna equipment; 39-Second antenna equipment; 40-Third antenna equipment; 41-Foam bracket; 42-First counterweight lead block; 43-Second counterweight lead block; 44-Third counterweight lead block; 45-Fourth counterweight lead block; 46-Fifth counterweight lead block; 47-First aluminum cover plate; 48-Second aluminum cover plate; 49-Third aluminum cover plate; 50-Fourth aluminum cover plate; 51-Fifth aluminum cover plate; 52-Sixth aluminum cover plate; 53-Seventh aluminum cover plate; 54-Eighth aluminum cover plate; 5 5- Ninth aluminum cover plate; 56- Tenth aluminum cover plate; 57- Eleventh aluminum cover plate; 58- Twelfth aluminum cover plate; 59- Thirteenth aluminum cover plate; 60- Fourteenth aluminum cover plate; 61- Fifteenth aluminum cover plate; 62- Sixteenth aluminum cover plate; 63- Seventeenth aluminum cover plate; 64- Eighteenth aluminum cover plate; 65- Nineteenth aluminum cover plate; 66- Twentieth aluminum cover plate; 67- Twenty-first aluminum cover plate; 68- Twenty-second aluminum cover plate; 69- Twenty-third aluminum cover plate; 70- Rigid foam; 71- Connector. Detailed Implementation

[0053] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0054] Example 1:

[0055] Reference Figures 1-21 This embodiment provides a multi-mast low RCS test carrier for underwater vehicles, including a test carrier body and a counterweight, wherein:

[0056] The test carrier body is used to install multi-mast equipment (including optoelectronic masts, electronic reconnaissance equipment, radar antennas, communication antennas, and lifting masts) that need to be tested for RCS. During testing, the bottom surface of the test carrier body is supported on the top of the foam support 41. The counterweights (such as the first counterweight lead block 42, the second counterweight lead block 43, the third counterweight lead block 44, the fourth counterweight lead block 45, and the fifth counterweight lead block 46 shown in the attached figure) are configured to be set on the upper surface 5 of the test carrier body to adjust the center of gravity position so that the center of gravity of the test carrier body after installing the multi-mast equipment is within a set radius range with the top center of the foam support 41 as the center.

[0057] Specifically, the test carrier body includes an upper surface 5 and a lower surface 10, and also includes an upper side surface (the upper side surface includes the first upper side surface 1, the second upper side surface 2, the third upper side surface 3, and the fourth upper side surface 4 shown in the attached drawing; these four surfaces are a continuous surface, and the distinction in the attached drawing is due to specific operations in the drawing process) and a lower side surface (the lower side surface includes the first lower side surface 6, the second lower side surface 7, the third lower side surface 8, and the fourth lower side surface 9; these four surfaces are a continuous surface, and the distinction in the attached drawing is due to specific operations in the drawing process) surrounding the lower surface 10. The upper surface 5 of the test carrier body is provided with multiple flange interface grooves for installing multi-mast equipment. The lower surface 10 of the test carrier body is flat. The included angle between the upper and lower sides of the test carrier body is 10° to 40°, and the connection between the upper and lower sides is provided with a rounded chamfer with a radius of less than 1 mm.

[0058] More specifically, the flange interface groove is provided with countersunk holes for mounting multi-mast equipment using countersunk screws. In a possible implementation, the upper and lower sides of the test carrier body are configured as an integral structure with the test carrier body, or as substitute wood or rigid foam with aluminum foil covering the surface. When the upper and lower sides of the test carrier body are substitute wood or rigid foam with aluminum foil covering the surface, the sides of the test carrier body are C-shaped connectors, the clamping side of the connector is connected to the substitute wood or rigid foam, and the upper surface 5 and lower surface 10 of the connector form a smooth transition between the test carrier body and the substitute wood or rigid foam 70.

[0059] Furthermore, in this embodiment, the upper surface 5 of the test carrier body is provided with weight-reducing grooves (such as the first weight-reducing groove 17, the second weight-reducing groove 18, the third weight-reducing groove 19, the fourth weight-reducing groove 20, the fifth weight-reducing groove 21, the sixth weight-reducing groove 22, the seventh weight-reducing groove 23, the eighth weight-reducing groove 24, the ninth weight-reducing groove 25, the tenth weight-reducing groove 26, the eleventh weight-reducing groove 27, the twelfth weight-reducing groove 28, the thirteenth weight-reducing groove 29, the fourteenth weight-reducing groove 30, the fifteenth weight-reducing groove 31, the sixteenth weight-reducing groove 32, and the seventeenth weight-reducing groove 33 shown in the attached drawings), so that the test carrier body forms interlaced transverse and longitudinal ribs. In addition, it also includes aluminum cover plates (as shown in the attached drawings: first aluminum cover plate 47, second aluminum cover plate 48, third aluminum cover plate 49, fourth aluminum cover plate 50, fifth aluminum cover plate 51, sixth aluminum cover plate 52, seventh aluminum cover plate 53, eighth aluminum cover plate 54, ninth aluminum cover plate 55, tenth aluminum cover plate 56, eleventh aluminum cover plate 57, twelfth aluminum cover plate 58, thirteenth aluminum cover plate 59, fourteenth aluminum cover plate 60, fifteenth aluminum cover plate 61, sixteenth aluminum cover plate 62, seventeenth aluminum cover plate 63, eighteenth aluminum cover plate 64, nineteenth aluminum cover plate 65, and twentieth aluminum cover plate 66). The twenty-first aluminum cover plate 67, the twenty-second aluminum cover plate 68, and the twenty-third aluminum cover plate 69 are used to cover the weight reduction groove and the flange interface groove where no multi-mast equipment is installed. The gap width between the edge of the aluminum cover plate and the weight reduction groove and the flange interface groove (such as the first flange interface groove 11, the second flange interface groove 12, the third flange interface groove 13, the fourth flange interface groove 14, the fifth flange interface groove 15, and the sixth flange interface groove 16 shown in the attached figure) is less than 0.2 mm, and aluminum foil is provided between the gaps. The upper surface of the aluminum cover plate is flush with the upper surface 5 of the test carrier body.

[0060] Specifically, in this embodiment, the surface roughness of the aluminum cover plate is less than 1.6 mm. Furthermore, the upper surface 5 of the test carrier body is provided with multiple symmetrical lifting point grooves (such as the first lifting point groove 34, the second lifting point groove 35, the third lifting point groove 36, and the fourth lifting point groove 37 shown in the attached figures) for hoisting the test carrier body and the multi-mast equipment mounted on it to the top of the foam support 41; the lifting point grooves are sealed with aluminum foil. The upper surface 5 and lower surface 10 of the test carrier body are covered with radar absorbing material; the test carrier body is made of aluminum alloy, with a length, width, and height of 4500 mm, 2700 mm, and 60 mm, respectively.

[0061] More specifically, the top view of the test carrier body is elliptical. The major axis L and minor axis W of the ellipse are mainly determined based on the maximum size of the combined target under test. The longitudinal and lateral directions of the underwater vehicle are preferentially set as the major and minor axes of the ellipse. The height H of the test carrier is mainly optimized based on the weight, strength, and RCS requirements of the test carrier. In this embodiment, the length, width, and height of the test carrier body are 4500mm, 2700mm, and 60mm, respectively. Figure 1-3 As shown. To reduce the weight of the test carrier body, aluminum alloy with low density was chosen as the material. The upper and lower sides and surfaces of the test carrier body all have high smoothness, with surface roughness Ra (arithmetic mean deviation of profile) less than 1.6. Specifically, the upper side and upper surface 5, and the lower side and lower surface 10, are seamlessly connected at the joint by rounded chamfers, and the curvature is continuous, which reduces traveling wave scattering caused by surface discontinuities, such as... Figure 3-4 As shown. The lower surface 10 of the test carrier body is flat, which ensures that it can be placed stably on the foam support 41 during the experimental test.

[0062] The angle between the upper surface 1 and the lower surface 6 of the test carrier body is α. According to the specular reflection mechanism, by setting α to a smaller angle, the incident wave can be reflected to other directions, thereby reducing backscattering. In this embodiment, the angle α can be set to a range of 10° to 40°, preferably α is 20°. The angle α of the test carrier body is chamfered, and the radius of the chamfer is less than 1mm to reduce specular reflection of the test carrier caused by an excessively large chamfer radius.

[0063] After the multi-mast equipment under test is installed in the flange interface groove, the bottom edges of these devices under test (such as the first antenna device 38, the second antenna device 39, and the third antenna device 40 shown in the attached diagram) (i.e., the upper surface of the mounting base of the device under test) are flush with the upper surface 5 of the test carrier body without any step difference. In this embodiment, to reduce the weight of the test carrier and improve its rigidity and strength, seventeen weight-reducing grooves with a depth of 55mm are provided on the upper surface 5 of the test carrier body. This creates a cross-shaped grid distribution of transverse and longitudinal ribs on the test carrier, thereby strengthening the structural strength and rigidity and reducing weight. Figure 6 As shown. By optimizing the shape and position of each weight-reducing groove, it is possible to simultaneously meet the requirements of not exceeding the maximum weight, the strength safety factor, and the tilt angle of the equipment under the heaviest combined working conditions.

[0064] Because the test carrier and the equipment to be tested are quite heavy, four hanging point grooves are provided on the upper surface 5 of the test carrier body, such as... Figure 7As shown, the suspension point grooves are distributed and symmetrically arranged around the test carrier. The diameter of the threaded hole and the size of the lifting ring can be selected according to the maximum total weight of the combined working conditions. In this embodiment, the diameter of the threaded hole is 20mm. In addition, in order to reduce traveling wave scattering caused by surface discontinuities, after the test carrier and each antenna device are hoisted as a whole onto the foam support 41, the four suspension point grooves with a threaded hole diameter of 20mm are sealed with aluminum foil.

[0065] To ensure that the overall center of gravity of the test carrier and all combined operating conditions equipment is within a circle with a diameter of 100mm centered on the foam support 41, this embodiment uses the weight and center of gravity of the test carrier and all combined operating conditions equipment as inputs. Different sized lead weights are designed in the weight-reduction grooves to adjust the overall center of gravity of each combined operating condition to near the center of the foam support 41. The maximum weight combination operating condition in this embodiment is when three antennas are simultaneously raised (…). Figure 8 Under the operating condition of foam support 41, the center of the ellipse of the test carrier coincides with the center of the ellipse. Figure 8 As shown, since the weight of the first antenna device 38 is much greater than that of the third antenna device 40, it is necessary to add counterweight lead blocks in the weight-reducing groove near the third antenna device 40, such as... Figure 9 As shown. The number and location of antennas vary depending on the testing conditions of different antenna equipment; therefore, different lead weights need to be placed in the weight-reduction grooves.

[0066] In this embodiment, the upper surface 5 of the test carrier body is provided with six flange interface grooves. However, in actual use, only some of the flange interface grooves are used to install the antenna device under test in most cases. The flange interface grooves without installed equipment need to be sealed with aluminum cover plates. In addition, the upper surface 5 is also provided with seventeen weight-reduction grooves with a depth of 55mm, which also need to be sealed with aluminum cover plates during testing. This utility model provides twenty-three 1mm thick aluminum cover plates 47-69, such as... Figure 10 As shown, during testing, after installing the antenna device under test and the lead weight, the weight-reducing groove on the upper surface 5 and the flange interface groove where the equipment is not installed need to be sealed with an aluminum cover plate, such as... Figure 11 As shown. After the aluminum cover is closed, the gap width between the cover and the upper surface 5 is less than 0.2 mm, and the gap is glued with aluminum foil. All aluminum cover plates and the upper surface 5 have no step difference. The surface roughness Ra (arithmetic mean deviation of profile) of the aluminum cover plate is less than 1.6, which can ensure that the test carrier has a good surface current guiding effect, thereby reducing traveling wave scattering caused by the discontinuity of the upper surface.

[0067] In addition, sometimes there are higher weight requirements for the test carrier. Therefore, aluminum alloy can be replaced with wood substitutes or rigid foam 70 with aluminum foil skin pasted on the upper and lower sides (areas 1-4 and 6-9) to reduce weight. Figure 12 As shown. The side of the aluminum alloy test carrier body can be machined into a C-shaped connector 71. The clamping side of the C-shaped connector 71 is connected to the substitute wood or rigid foam 70, and the upper and lower surfaces of the C-shaped connector 71 form a smooth transition between the test carrier and the substitute wood or rigid foam 70.

[0068] To verify whether the design scheme of this utility model meets the requirements, the total weight and center of gravity position of the heaviest combination working condition were first checked, such as... Figure 13 As shown in the figure, the total weight of the heaviest combination, including the test carrier, three antennas, lead counterweights, and an aluminum cover plate, is 1.77t, with a center of gravity of (-3mm, 8mm). This meets the requirement that the total weight not exceed 2t and the center of gravity be within a circle with a diameter of 100mm centered on the top of the foam support 41. Setting the center of gravity near the top center of the foam support 41 effectively improves the overall stability of the test carrier and antenna equipment during testing. The four threaded holes of this invention have a diameter of 20mm, and four M20 lifting rings are sufficient to lift a 1.77t load.

[0069] Secondly, the strength safety factor for the most severe combination of working conditions was simulated and calculated, such as... Figure 17-19 As shown in the figure, under the heaviest combination of working conditions, the maximum deformation of the test carrier is 5 mm and the maximum stress is 26.68 MPa. Since the strength of the aluminum alloy test carrier is 280 MPa, the strength safety factor of the test carrier can be calculated to be 10.9, which meets the requirement that the strength safety factor should not be less than 2. Furthermore, if a higher strength safety factor is required for the test carrier, high-strength rust-resistant aluminum alloy or similar materials can be used.

[0070] Next, simulation calculations were performed on the angle of antenna tilt caused by deformation of the test carrier under the most complex combination conditions, such as... Figure 17-19 As shown in the figure, the deformation of the mounting surfaces of the three antenna flanges is 2.51mm~3.85mm, 0mm~0.05mm, and 1.39mm~2.16mm, respectively. The diameter of the three antenna flanges is 360mm. Therefore, the tilt angles of the three antennas can be calculated to be 0.21°, 0.01°, and 0.12°, respectively, which meets the requirement that the tilt angle of the antenna equipment is not greater than 0.3°.

[0071] Finally, the average RCS of the test carrier in the X-band was simulated and calculated. Since the flange interface groove and weight-reduction groove on the upper surface 5 are sealed by an aluminum cover plate, and the gap between the cover plate and the upper surface 5 is less than 0.2 mm, and the gap is sealed with aluminum foil, the upper surface 5 can be considered a smooth plane without grooves. Figure 20-21 As shown, according to the calculation results, the average RCS of the test carrier in the X-band is -22.7dB, which meets the requirement that the average RCS in the X-band should not exceed -20dB. Furthermore, if a higher RCS is required for the test carrier, the average RCS can be further reduced by applying 1mm to 3mm thick radar-absorbing material to the sides, top and bottom surfaces, and aluminum cover plate of the test carrier.

[0072] The test carrier provided in this embodiment can be designed using the following method:

[0073] 1. Based on the layout diagram of each antenna device on the underwater vehicle, prioritize setting the longitudinal and lateral directions of the underwater vehicle as the major and minor axes of an ellipse, and design a small ellipse that can cover all antenna devices.

[0074] 2. Based on the average RCS requirements of the test carrier, the sides of the test carrier are set as two sides with a certain included angle, ranging from 10° to 40°. The included angle is chamfered with a radius less than 1mm. The upper and lower sides and the upper and lower surfaces need to be seamlessly connected at the joint with continuous curvature after rounding chamfering.

[0075] 3. Based on the weight requirements of the heaviest combination working condition and the antenna equipment interface requirements, aluminum alloy with low density is selected as the material of the test carrier. First, flange interface grooves of all antenna equipment are set on the upper surface of the test carrier. Then, multiple weight-reducing grooves are set on the upper surface of the test carrier. By optimizing the shape and position of each weight-reducing groove, the test carrier forms transverse and longitudinal ribs with a cross-shaped grid distribution.

[0076] 4. Seal the flange interface groove and weight reduction groove with an aluminum cover plate of approximately 1mm thickness. After the multi-mast equipment under test is installed on the corresponding flange interface with countersunk screws, the gap width between the bottom of the multi-mast equipment under test and the upper surface of the test carrier should be less than 0.2mm, and the gap should be sealed with aluminum foil. If the test carrier and each antenna device (optical mast, electronic reconnaissance equipment, radar antenna, communication antenna) are hoisted as a whole onto the foam support, the hoisting point groove also needs to be sealed with aluminum foil.

[0077] 5. Based on the requirements for the center of gravity position under the combined operating conditions, first calculate the overall center of gravity of the test carrier and antenna equipment without the counterweight lead blocks. If the center of gravity position does not meet the requirements, add counterweight lead blocks in the weight reduction groove to make the overall center of gravity position meet the requirements. It is necessary to calculate the configuration scheme of the counterweight lead blocks under different antenna equipment operating conditions to ensure that the center of gravity position meets the requirements under each combined operating condition.

[0078] 6. Using simulation software, calculate and verify the preliminary design of the test carrier under the heaviest combination working conditions, including weight, center of gravity position, average RCS, strength safety factor, and tilt angle of the multi-mast equipment under test due to deformation of the test carrier. Based on the simulation calculation results, optimize the parameters such as the shape of the test carrier, the shape and position of the weight reduction groove, etc., to ensure that the final design of the test carrier meets all the requirements.

[0079] 7. If optimizing the shape, weight reduction groove shape and position of the test carrier still cannot meet the requirements, consider changing the material of the test carrier. For example, replace aluminum alloy with high-strength rust-proof aluminum alloy; or replace aluminum alloy with wood or foam on the upper and lower side areas of the test carrier to reduce weight; or apply radar absorbing material to the sides, upper and lower surfaces and aluminum cover plate of the test carrier to further reduce the average RCS.

[0080] The test carrier provided in this embodiment can meet the following performance requirements:

[0081] 1) The average RCS of the test carrier in the X-band is no greater than -20dB, so as to reduce the influence of the test carrier on the RCS of the multi-mast equipment under test;

[0082] 2) The overall center of gravity of the test carrier and each combined working condition antenna equipment is located within a circle with a diameter of 100mm centered on the foam support, which improves the overall stability of the test carrier and the multi-mast equipment under test during testing.

[0083] 3) The total weight of the heaviest combination of working conditions shall not exceed 2t, which meets the load-bearing requirements of the foam support for the microwave anechoic chamber;

[0084] 4) The strength safety factor for the heaviest combination of working conditions shall not be less than 2, so as to improve the overall safety of the test carrier and the multi-mast equipment under test during testing;

[0085] 5) Under the heaviest combination of working conditions, the angle of tilt of the multi-mast equipment under test caused by the deformation of the test carrier shall not exceed 0.3°, thereby reducing the influence of the test carrier on the attitude of the multi-mast equipment under test.

[0086] Due to the special design background of this test vehicle, and the high design requirements and difficulty, there are currently no relevant design schemes or methods for underwater multi-mast low RCS test vehicles in the existing technology.

[0087] In summary, the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An underwater vehicle multi-mast low RCS test vehicle, characterized by, This includes the test carrier body and the counterweight; The test carrier body is used to install the multi-mast equipment that needs to be tested for RCS. During testing, the bottom surface of the test carrier body is supported on the top of the foam support, and the counterweight is configured to be set on the upper surface of the test carrier body to adjust the center of gravity position so that the center of gravity of the test carrier body after the multi-mast equipment is installed is within a set radius range with the center of the top of the foam support as the center.

2. The underwater vehicle multi-mast low RCS test carrier according to claim 1, characterized in that, The test carrier body includes an upper surface and a lower surface, and also includes an upper side surface that surrounds the upper surface to form a ring, and a lower side surface that surrounds the lower surface to form a ring. The upper surface of the test carrier body is provided with multiple flange interface grooves for installing the multi-mast equipment; The lower surface of the test carrier body is a plane; The angle between the upper and lower sides of the test carrier body is 10° to 40°, and a rounded chamfer with a radius of less than 1mm is provided at the connection between the upper and lower sides.

3. The underwater vehicle multi-mast low RCS test carrier according to claim 2, characterized in that, The flange interface groove is provided with a countersunk hole for mounting the multi-mast equipment using countersunk screws.

4. The underwater vehicle multi-mast low RCS test carrier according to claim 2, characterized in that, The upper and lower sides of the test carrier body are configured as an integral structure with the test carrier body, or as a substitute wood or rigid foam with aluminum foil skin pasted on the surface.

5. The underwater vehicle multi-mast low RCS test carrier according to claim 4, characterized in that, When the upper and lower sides of the test carrier body are made of wood substitutes or rigid foam with aluminum foil covering, the sides of the test carrier body are C-shaped connectors. The clamping side of the connector is connected to the wood substitute or rigid foam, and the upper and lower surfaces of the connector form a smooth transition between the test carrier body and the wood substitute or rigid foam.

6. A multi-mast low RCS test platform for underwater vehicles according to any one of claims 2 to 5, characterized in that, The upper surface of the test carrier body is provided with weight-reducing grooves, which make the test carrier body form interlaced transverse and longitudinal ribs.

7. The underwater vehicle multi-mast low RCS test carrier according to claim 6, characterized in that, It also includes aluminum cover plates; The aluminum cover plate is used to cover the weight reduction groove and the flange interface groove where the multimast equipment is not installed; The gap width between the edge of the aluminum cover plate and the weight-reducing groove and the flange interface groove is less than 0.2 mm, and aluminum foil is provided between the gaps; The upper surface of the aluminum cover plate is flush with the upper surface of the test carrier body.

8. The underwater vehicle multi-mast low RCS test carrier according to claim 7, characterized in that, The surface roughness of the aluminum cover plate is less than 1.6 mm.

9. A multi-mast low RCS test platform for underwater vehicles according to any one of claims 1 to 5, characterized in that, The upper surface of the test carrier body is provided with multiple symmetrical lifting point grooves around its perimeter, which are used to lift the test carrier body and the multi-mast equipment installed on it as a whole to the top of the foam support. The hanging point groove is sealed with aluminum foil.

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