Resistance test device for depth-variable underwater vehicle

Abstract

The invention discloses a resistance test device for a depth-variable underwater vehicle, and the device is characterized in that a support frame is fixedly installed at the bottom of a hydrodynamic test trailer, and two groups of guide rail assemblies in the support frame are symmetrically arranged at the two sides of the bottom of the central axis of the hydrodynamic test trailer; two groups of sliding block connecting structures at the bottom end of the motion bearing platform are fixedly connected with the sliding blocks in the guide rails on the two sides, and the motion bearing platform and the supporting frame are locked and fixed; the lifting test mechanism penetrates through the middle part of the motion bearing platform through a lifting screw rod, and the lifting screw rod is matched with a hand wheel; the underwater vehicle model lifting device is fixedly connected with an underwater vehicle model through a model connecting assembly on the lower portion of the underwater vehicle model lifting device, and the model connecting assembly and the underwater vehicle model are vertically lifted or descended through the action of a hand wheel on a lifting lead screw, so that the underwater vehicle model is mounted or dismounted on the water surface. And ascending and descending of the underwater vehicle model in the test process.

Description

Technical Field

[0001] This invention relates to the field of hydrodynamic testing technology for underwater vehicles, and more particularly to a resistance testing device for a variable-depth underwater vehicle. Background Technology

[0002] The drag test of an underwater vehicle is a towing test conducted using a scaled-down model. The drag test can accurately obtain the magnitude of the drag of the vehicle at different speeds, and is an important research method for predicting the speed of a real vessel.

[0003] When conducting scaled-down model drag tests, it is necessary to compare and study the effects of different appendages on the drag performance, as well as the effects of changing the model's depth relative to the water surface on drag performance. Therefore, the model's configuration and depth relative to the water surface need to be frequently changed during the test. Since scaled-down drag tests are generally conducted in a towing tank, in the past, the tow truck was typically returned to the dry dock, the water in the dock was pumped out, and then the experimenter would enter the dry dock to change the model's configuration and depth. This method of changing the test plan wastes a significant amount of test time and introduces certain risks. Summary of the Invention

[0004] The purpose of this invention is to provide a resistance testing device for variable depth underwater vehicles, so as to solve the problems of low efficiency caused by the complexity of the testing process and the need to rely on the dry dock to pump water and change the state of the model when conducting resistance tests of underwater vehicles through a towing pool.

[0005] The technical solution of the present invention is as follows: The present invention provides a resistance testing device for a variable depth underwater vehicle, comprising: a hydrodynamic test trailer 1, a support frame 2, an underwater vehicle model 6, and at least one set of corresponding motion bearing platform 3 and lifting test mechanism 4; Among them, the bottom of the hydrodynamic test trailer 1 is fixedly suspended and installed with a support frame 2, and two sets of guide rail assemblies are symmetrically arranged on both sides of the bottom of the central axis of the hydrodynamic test trailer 1. Guide rails 2-2 are fixedly installed on the top of the two sets of guide rail assemblies respectively, and sliders 2-3 that can slide freely are set in the grooves of the guide rails 2-2. Two sets of slider connection structures are fixedly installed on both sides of the bottom of the motion bearing platform 3 and are fixedly connected to the sliders in the guide rails 2-2 on both sides. The locking components configured inside them are used to lock and fix the motion bearing platform 3 and the support frame 2. The lifting test mechanism 4 is connected to the underwater vehicle model 6 by a lifting screw 4-1 at the top, which passes through the middle of the motion support platform 3. A handwheel 4-2 is provided at the top of the motion support platform 3 to cooperate with the lifting screw 4-1 to implement screw movement. The lifting test mechanism 4 is fixedly connected to the underwater vehicle model 6 through the model connection component at the bottom. The handwheel 4-2 is used to vertically raise or lower the model connection component and the underwater vehicle model 6 by acting on the lifting screw 4-1, so as to realize the installation or disassembly of the underwater vehicle model 6 on the water surface, as well as the raising and lowering of the underwater vehicle model 6 during the test.

[0006] Optionally, in the resistance testing device for the variable depth underwater vehicle as described above, each set of guide rail assemblies in the support frame 2 includes: box beam 2-1, guide rail 2-2, and slider 2-3. The box girder 2-1 is configured as a hollow frame beam structure. The two box girders 2-1 are arranged on both sides of the bottom of the central axis of the hydrodynamic test trailer 1, and the two ends of the two box girders 2-1 are fixedly connected by front and rear end plates respectively. The hydrodynamic test trailer 1 is suspended and connected to the support frame 2 through the front and rear end plates, so that the top surface of the support frame 2 is flush with the water surface. The top of each box girder 2-1 is fixedly installed with guide rails 2-2 by screws. The cross section of each guide rail 2-2 is an inverted T-shaped structure, and a slider 2-3 is embedded in the groove cavity of the guide rail 2-2. The cross section size of the slider 2-3 is slightly smaller than the cross section size of the groove cavity of the guide rail 2-2, so that the slider 2-3 can slide in the guide rail 2-2.

[0007] Optionally, in the resistance testing device for the variable depth underwater vehicle as described above, each set of the motion bearing platform 3 includes: two sets of slider connection structures, locking handle 3-3, and bearing structure 3-4; The bearing structure 3-4 is configured as a combined box structure, including a bearing plate and a bearing box fixedly installed at the bottom center of the bearing plate. Two sets of slider connection structures are fixedly installed on both sides of the bottom of the bearing plate. The locking handles 3-3 that pass through the bearing plate and the slider connection structure are respectively connected to the sliders 2-3 nested in the guide rails 2-2 on both sides, so as to realize the fixed connection between the motion bearing platform 3 and the support frame 2. In addition, the bearing plate and the bearing box are provided with through holes for assembly with the lifting screw 4-1 and each guide rod 4-3 in the lifting test mechanism 4.

[0008] Optionally, in the resistance testing device for the variable depth underwater vehicle as described above, the two sets of slider connection structures are respectively: guide rail 3-1 and rail pressure block 3-2; The guide rail 3-1 and the rail pressure block 3-2 are equidistantly arranged on both sides of the bottom end of the bearing plate. The guide rail 3-1 is provided with a groove that matches the upper end face of the guide rail 2-2. The rail pressure block 3-2 is set as a plate support structure. The groove of the guide rail 3-1 is engaged with the outer edge of the upper end face of the guide rail 2-2 and plays a guiding role when the moving bearing platform 3 slides. The groove plane of the guide rail 3-1 is flush with the bottom surface of the rail pressure block 3-2 to ensure that the moving bearing platform 3 is flush with the water surface.

[0009] Optionally, in the resistance testing device for the variable depth underwater vehicle as described above, through holes are provided at the four corners of the support plate. The screws of each set of locking handles 3-3 pass through the through holes at the four corners of the support plate and the through holes of the corresponding slider connection structure, and are threadedly connected to the sliders 2-3 provided in the inner cavity of the guide rail 2-2. By screwing the handles placed on the upper end of the support plate to lock the sliders 2-3 and the slider connection structure of the guide rail 2-2, the outer wall surface of the sliders 2-3 is tightly attached to the guide rail 2-2, thereby fixing the moving support platform 3 on the support frame 2.

[0010] Optionally, in the resistance testing device for the variable depth underwater vehicle as described above, each set of motion bearing platform 3 further includes: multiple sets of auxiliary fastening components; on each box girder 2-1, a set of auxiliary fastening components is fixedly installed at both the front and rear ends of each set of motion bearing platform 3. Each set of auxiliary fastening components includes: fastening component 3-5, nut 3-6, and screw 3-7; two fastening components 3-5 are symmetrically clamped on both sides of the box girder 2-1, the inner fastening component 3-5 is close to the front or rear face of the load-bearing structure 3-4, and the outer fastening component 3-5 is close to the outer side of the box girder 2-1. Two screws 3-7 pass through the upper and lower through holes of the two fastening components 3-5 respectively, and the fastening components 3-5 on both sides are locked and fixed by nuts 3-6 on each screw 3-7.

[0011] Optionally, in the resistance testing device for the variable depth underwater vehicle as described above, each lifting test mechanism 4 includes: a lifting screw 4-1, a handwheel 4-2, a guide rod 4-3, a linear bearing 4-5, a connecting base 4-6, an upper connecting plate 4-7, a lower connecting plate 4-8, a connecting rod 4-9, a bottom connecting plate 4-10, a transition connector 4-11, a force sensor 4-12, a model connecting plate 4-13, and an upper shaft support 4-4-1, a middle shaft support 4-4-2, and a lower shaft support 4-4-3; The upper connecting plate 4-7 is embedded in the groove of the lower connecting plate 4-8 and fixedly connected by screws. The middle part of the upper end face of the upper connecting plate 4-7 is fixedly connected to the bottom end of the lifting screw 4-1 through the fixedly installed connecting base 4-6. A guide rod 4-3 is fixedly connected to the front and rear sides of the upper end face of the upper connecting plate 4-7 through the fixedly installed middle shaft support 4-4-2. The lifting screw 4-1 and the guide rod 4-3 pass through the through holes at corresponding positions on the bearing structure 3-4. The rod part of the lifting screw 4-1 extending out of the upper end face of the bearing plate is threadedly connected to the bottom flange of the handwheel 4-2, which is used to implement the lifting and lowering action of the lifting test mechanism 4 by rotating the handwheel 4-2. Each guide rod 4-3 passes through the linear bearing 4-5 fixedly installed in the bearing box and the upper shaft support 4-4-1 fixedly installed on the upper end face of the bearing plate to ensure the guiding position of the guide rod 4-3 and play a guiding role in the lifting test mechanism 4 during the upward or downward movement. The lower connecting plate 4-8 is connected to the top of the connecting rod 4-9 via the lower shaft support 4-4-3 fixedly installed on the front and rear sides of its bottom end. The bottom ends of each connecting rod 4-9 are respectively connected to the lower shaft support 4-4-3 fixedly installed on the upper surface of the bottom connecting plate 4-10. The force sensor 4-12 is fixedly connected to the bottom end of the bottom connecting plate 4-10 via the transition connector 4-11. The model connecting plate 4-13 fixedly installed at the bottom end of the force sensor 4-12 is used to fixally connect the underwater vehicle model 6.

[0012] Optionally, in the drag testing apparatus for the variable depth underwater vehicle as described above, The outer wall of the guide rod 4-3 is provided with a scale for reading the lifting stroke of the lifting test mechanism 4; the length of each guide rod 4-3 is greater than the length of the connecting rod 4-9, so as to facilitate the underwater vehicle model 6 to be lifted to the water surface for installation or disassembly.

[0013] Optionally, the drag test device for the variable depth underwater vehicle as described above further includes: at least one set of underwater rectifier 5 covering the outside of the lower model connection assembly of each lifting test mechanism 4; Each underwater rectifier assembly 5 includes: a connecting flange 5-1, a rectifier 5-2, a reinforcing rib 5-3, and a retainer 5-4; the rectifier 5-2 has a spindle-shaped overall cross-section and is divided into two halves that cover the outside of the lower model connecting assembly of the lifting test mechanism 4; the top surface of the rectifier 5-2 is fixedly connected to the connecting flange 5-1, and is fixedly connected to the bottom end of the lower connecting plate 4-8 through the connecting flange 5-1; Multiple reinforcing ribs 5-3 and retainers 5-4 are welded to the inside of the fairing 5-2. The reinforcing ribs 5-3 and retainers 5-4 are equidistant and evenly distributed. The distance between the front and rear support arms on the retainer 5-4 is the same as the distance between the two connecting rods 4-9, which is used to fix the retainer 5-4 to the outer circle of the connecting rod 4-9 by the concave semicircles of the front and rear support arms.

[0014] The beneficial effects of the present invention are as follows: The present invention provides a resistance testing device for a variable depth underwater vehicle. A support frame 2 is fixedly mounted on the bottom of the hydrodynamic test trailer 1. A moving bearing platform 3 is fixedly mounted on the support frame 2, and a lifting test mechanism 4 with lifting and lowering capabilities is mounted on the moving bearing platform 3. The lifting test mechanism 4 realizes the lifting and lowering function of the underwater vehicle model 6 connected to the bottom through its upper lifting structure, so as to realize the installation or disassembly of the underwater vehicle model 6 on the water surface, as well as the raising and lowering of the underwater vehicle model 6 during the test.

[0015] The drag testing device for variable-depth underwater vehicles provided by this invention allows for the model to be raised to the surface at any time during the test to check and change its test status, and also enables the test model to be positioned at the required diving depth according to research needs. This is of great significance for the study of the speed of underwater vehicles. The technical solution provided by this invention has the following beneficial effects: First, it has a reliable structure and strong longitudinal load-bearing capacity. Based on the force characteristics, the resistance test device adopts a longitudinal bearing layout, with two sets of six shafts arranged longitudinally to bear the resistance in the navigation direction; in addition, the top motion bearing platform 3 is designed as a box structure, which can better bear the bending moment of the slender resistance test device; the underwater vehicle model 6 is fixed by a front and rear working method to avoid vibration of the underwater vehicle model 6 during high-speed movement.

[0016] Secondly, the surface is smooth, and the testing accuracy is high. The underwater part of the resistance test device is built into the smooth underwater rectifier assembly 5. The test transmission cables are all connected to the bottom sensor through the light reduction hole and the inside of the flow guide shroud of the device. The test has little impact on the flow field, and the built-in sensor is not affected by the external water flow. The test accuracy is high.

[0017] Third, it is simple to operate and has high testing efficiency. During the experiment, the lifting test mechanism 4 can be used to lift the model to the water surface, and the tester can change the test state on the water surface. The lifting mechanism can also be used to place the model at the required water depth. The operation is simple and the test efficiency is high.

[0018] Fourth, it has strong adaptability and wide application. The resistance testing device can adjust the distance between the two sets of moving bearing platforms 3 back and forth, and can simultaneously adjust the diving depth up and down. This resistance testing device can be used to carry out resistance tests on models of different lengths and models with different diving depth requirements. Attached Figure Description

[0019] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0020] Figure 1 A schematic diagram of the overall structure of a drag testing device for a variable depth underwater vehicle provided in an embodiment of the present invention; Figure 2 for Figure 1 The schematic diagram of the support frame and moving load-bearing platform in the resistance testing device provided in the embodiment shown is as follows; Figure 3 for Figure 1 A three-dimensional structural schematic diagram of the moving load-bearing platform in the resistance testing device provided in the embodiment shown; Figure 4 for Figure 1 A schematic diagram of the lifting test mechanism in the resistance testing device provided in the embodiment shown; Figure 4 Figure a shows the overall structure, Figure b shows the cross-sectional view of the connection between the underwater rectification component and the moving support platform, and Figure c shows the scale of the guide rod. Figure 5 for Figure 1 A schematic diagram of the underwater rectification component in the resistance testing device provided in the embodiment shown. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

[0022] As explained in the background section, existing resistance testing methods for underwater vehicles, such as changing the model's state or diving depth, waste a significant amount of testing time and introduce certain risks. Specifically, these methods cause the following problems: First, pumping and releasing water takes up too much testing time; second, excessively long testing times may lead to cracking and deformation of the wooden test model, further affecting the accuracy of the test; and third, there are certain safety risks for the experimenters working in the dock.

[0023] Because the test model is towed at high speed underwater, it experiences very high resistance. Therefore, traditional test devices are often designed as relatively bulky fixed test devices to ensure strength and enhance underwater rigidity. This makes it difficult to change test conditions and adjust the model's diving depth. In addition, the large fixed test devices require lifting equipment and special tooling for installation and dismantling before and after testing, which is time-consuming and labor-intensive.

[0024] To address the inefficiencies of underwater vehicle drag testing in towed pools, which involve complex processes, reliance on dry dock pumping and model replacement, and bulky and difficult-to-assemble / disassemble testing equipment, this invention provides a variable-depth underwater vehicle drag testing device. This device allows for the model to be surfaced at any time during testing to check and replace its condition, and enables the model to be positioned at the required depth for research purposes. This is of significant importance for research on the speed and responsiveness of underwater vehicles.

[0025] The present invention provides the following specific embodiments, which can be combined with each other. For the same or similar concepts or processes, they may not be described again in some embodiments.

[0026] Figure 1 This is a schematic diagram of the overall structure of a drag testing device for a variable-depth underwater vehicle provided in an embodiment of the present invention. The components of the drag testing device for a variable-depth underwater vehicle provided in this embodiment include: a hydrodynamic testing trailer 1, a support frame 2, an underwater vehicle model 6, and at least one corresponding motion-bearing platform 3, a lifting testing mechanism 4, and an underwater rectification component 5. This invention... Figure 1 The example shown is that there are two sets of each of the following components: the motion support platform 3, the lifting test mechanism 4, and the underwater rectification component 5.

[0027] like Figures 2 to 4 As shown, Figure 2 for Figure 1 The schematic diagram of the support frame and moving load-bearing platform in the resistance testing device provided in the embodiment shown is as follows. Figure 3 for Figure 1 The illustrated embodiment provides a three-dimensional structural diagram of the moving load-bearing platform in the resistance testing apparatus. Figure 4 for Figure 1 The schematic diagram of the lifting test mechanism in the resistance testing device provided in the embodiment shown is as follows. Figure 4 Figure a shows the overall structure, Figure b shows the cross-sectional view of the connection between the underwater rectification component and the moving support platform, and Figure c shows the scale of the guide rod. Figure 5 for Figure 1 A schematic diagram of the underwater rectification component in the resistance testing device provided in the embodiment shown.

[0028] See Figures 1 to 5As shown in the embodiment of the present invention, a support frame 2 is suspended at the bottom of the hydrodynamic test trailer 1, and two sets of guide rail assemblies are symmetrically arranged on both sides of the bottom of the central axis of the hydrodynamic test trailer 1 within the support frame 2. Guide rails 2-2 are fixedly installed on the top of the two sets of guide rail assemblies respectively, and sliders 2-3 that can slide freely are provided in the grooves of the guide rails 2-2. The motion bearing platform 3 is fixedly connected to the sliders in the guide rails 2-2 on both sides through two sets of slider connection structures fixedly installed on both sides of its bottom end, and the locking assembly configured inside it is used to lock and fix the motion bearing platform 3 and the support frame 2.

[0029] In this embodiment of the invention, the lifting test mechanism 5 passes through the middle of the motion support platform 3 via a lifting screw 4-1 at the top, and a handwheel 4-2 is provided at the top of the motion support platform 3 to cooperate with the lifting screw 4-1 to implement screw movement. The lifting test mechanism 5 is fixedly connected to the underwater vehicle model 6 via the model connecting component at its lower part, and the model connecting component and the underwater vehicle model 6 are vertically raised or lowered by the action of the lifting screw 4-1 through the handwheel 4-2, so as to realize the installation or disassembly of the underwater vehicle model 6 on the water surface, as well as the raising and lowering of the underwater vehicle model 6 during the test.

[0030] The drag testing device for variable depth underwater vehicles provided by this invention allows the model to be brought out of the water at any time during the test to check and change its test status, and the test model can be placed at the required diving depth according to the research needs. This is of great significance for the research on the speed of underwater vehicles.

[0031] In one implementation of this invention, such as Figure 2 As shown, each set of guide rail components in the support frame 2 includes: box beam 2-1, guide rail 2-2, and slider 2-3. In this implementation, the box beam 2-1 is set as a hollow frame beam structure. Two box beams 2-1 are arranged on both sides of the bottom of the central axis of the hydrodynamic test trailer 1, and the two ends of the two box beams 2-1 are fixedly connected by front and rear end plates respectively. The hydrodynamic test trailer 1 is suspended and connected to the support frame 2 through the front and rear end plates, so that the top surface of the support frame 2 is flush with the water surface. The top of each box beam 2-1 is fixedly installed with guide rail 2-2 by screws. The cross section of the guide rail 2-2 is an inverted T-shaped structure, and the groove cavity of the guide rail 2-2 is provided with slider 2-3. The number of sliders 2-3 in each set of guide rails 2-2 is the same as the number of motion bearing platforms 3. The slider 2-3 is set as a cuboid structure. The height of the slider 2-3 is slightly less than the height of the inner cavity of the guide rail 2-2, and the width of the slider 2-3 is slightly less than the width of the inner cavity of the guide rail 2-2, which is conducive to the sliding of the slider 2-3 in the guide rail 2-2.

[0032] In one implementation of this invention, such as Figure 2 and Figure 3As shown, each motion bearing platform 3 includes: two sets of slider connection structures, locking handle 3-3, and bearing structure 3-4.

[0033] In this implementation, the load-bearing structure 3-4 is set as a combined box structure, including a load-bearing plate and a load-bearing box fixedly set at the bottom center of the load-bearing plate; two sets of slider connection structures are fixedly installed on both sides of the bottom of the load-bearing plate, and locking handles 3-3 that penetrate the load-bearing plate and the slider connection structure are respectively connected to the sliders 2-3 nested in the guide rails 2-2 on both sides, so as to realize the fixed connection between the motion load-bearing platform 3 and the support frame 2; in addition, the load-bearing plate and the load-bearing box are provided with through holes for assembly with the lifting screw 4-1 and each guide rod 4-3 in the lifting test mechanism 4.

[0034] In one alternative implementation, such as Figure 3 As shown, the two sets of slider connection structures are: guide rail 3-1 and rail pressure block 3-2. Guide rail 3-1 and rail pressure block 3-2 are equidistantly arranged on both sides of the bottom end of the bearing plate. Guide rail 3-1 is provided with a groove that mates with the upper end face of guide rail 2-2. Rail pressure block 3-2 is set as a plate support structure. The groove of guide rail 3-1 is engaged with the outer edge of the upper end face of guide rail 2-2, and plays a guiding role when the moving bearing platform 3 slides. In addition, the groove plane of guide rail 3-1 is flush with the bottom surface of rail pressure block 3-2, ensuring that the entire moving bearing platform 3 is flush with the water surface.

[0035] It should be noted that in this implementation scheme, the reason for setting a guide rail 3-1 on one side and a rail block 3-2 on the other side is that if guide rails 3-1 are set on both sides, the parallelism of the guide rails 3-1 will not be high, which will cause the movement of the motion bearing platform 3 along the guide rail 2-2 to be stuck. The rail block 3-2 only serves to connect the slider 2-3 and support the bearing structure 3-4, and its contact with the upper surface of the corresponding guide rail 2-2 is planar.

[0036] In one alternative implementation, such as Figure 3 As shown, through holes are provided at the four corners of the bearing plate. The screws of each set of locking handles 3-3 pass through the through holes at the four corners of the bearing plate and the through holes of the corresponding slider connection structure, and are threadedly connected to the sliders 2-3 set in the inner cavity of the guide rail 2-2. By screwing the handles placed on the upper end of the bearing plate to lock the sliders 2-3 and the slider connection structure of the guide rail 2-2, the outer wall of the sliders 2-3 is tightly attached to the guide rail 2-2, thereby fixing the moving bearing platform 3 on the support frame 2.

[0037] In one alternative implementation, such as Figure 3As shown, each set of motion bearing platform 3 also includes: multiple sets of auxiliary fastening components. On each box girder 2-1, a set of auxiliary fastening components is fixedly installed at both the front and rear ends of each set of motion bearing platform 3, and each set of auxiliary fastening components is fixedly installed in pairs on the box girder 2-1.

[0038] In this implementation scheme, each set of auxiliary fastening components includes: fastening component 3-5, nut 3-6, and screw 3-7; two fastening components 3-5 are symmetrically clamped on both sides of the box girder 2-1, with the inner fastening component 3-5 tightly attached to the front or rear face of the load-bearing structure 3-4, and the outer fastening component 3-5 tightly attached to the outer side of the box girder 2-1; two screws 3-7 pass through the upper and lower through holes of the two fastening components 3-5 respectively, and each screw 3-7 is locked and fixed with a nut 3-6; for example Figure 3 As shown, each set of motion bearing platform 3 has a set of auxiliary fastening components installed at both ends of the front and rear, on the box beams 2-1 on both sides, for a total of four sets. In this implementation scheme, by setting multiple sets of auxiliary fastening components, the fixing effect between the motion bearing platform 3 and the support frame 2 can be further improved.

[0039] It should be noted that when actually setting the structure of the motion bearing platform 3, the bearing plate of the bearing structure 3-4, the bottom plate and the side plate of the bearing box can all be provided with relief holes.

[0040] In one implementation of this invention, such as Figure 3 and Figure 4 As shown, each lifting test mechanism 4 includes: a lifting screw 4-1, a handwheel 4-2, a guide rod 4-3, a linear bearing 4-5, a connecting base 4-6, an upper connecting plate 4-7, a lower connecting plate 4-8, a connecting rod 4-9, a bottom connecting plate 4-10, a transition connector 4-11, a force sensor 4-12, a model connecting plate 4-13, and upper shaft supports 4-4-1, middle shaft supports 4-4-2, and lower shaft supports 4-4-3.

[0041] In this implementation, the upper connecting plate 4-7 is embedded into the groove of the lower connecting plate 4-8 and fixedly connected by screws to ensure that the overall structure of the lifting test mechanism 4 is coaxial with the central axis. The middle part of the upper end face of the upper connecting plate 4-7 is fixedly connected to the bottom end of the lifting screw 4-1 through a fixedly installed connecting base 4-6. The connecting base 4-6 is fixedly installed in the middle part of the upper connecting plate 4-7 by screws. A guide rod 4-3 is fixedly connected to the front and rear sides of the upper end face of the upper connecting plate 4-7 through fixedly installed central shaft supports 4-4-2, and each central shaft support 4-4-2 is fixedly installed by screws. On the upper connecting plate 4-7, the lifting screw 4-1 and guide rod 4-3 pass through the through holes at corresponding positions on the bearing structure 3-4. The rod part of the lifting screw 4-1 extending out of the upper end face of the bearing plate is threadedly connected to the bottom flange of the handwheel 4-2, which is used to implement the lifting and lowering action of the lifting test mechanism 4 by rotating the handwheel 4-2. Each guide rod 4-3 passes through the linear bearing 4-5 fixedly installed in the bearing box and the upper shaft support 4-4-1 fixedly installed on the upper end face of the bearing plate to ensure the guiding position of the guide rod 4-3 and play a guiding role in the lifting test mechanism 4 during the upward or downward movement.

[0042] The lower connecting plate 4-8 is connected to the top of the connecting rod 4-9 by the lower shaft support 4-4-3 fixedly installed on the front and rear sides of its bottom end. The bottom end of each connecting rod 4-9 is connected to the lower shaft support 4-4-3 fixedly installed on the upper surface of the bottom connecting plate 4-10. Each lower shaft support 4-4-3 is fixedly installed on the bottom end of the lower connecting plate 4-8 by screws, or fixedly installed on the top surface of the bottom connecting plate 4-10. The force sensor 4-12 is fixedly connected to the bottom end of the bottom connecting plate 4-10 via the transition connector 4-11. The model connecting plate 4-13 fixedly installed at the bottom end of the force sensor 4-12 is used to fixally connect the underwater vehicle model 6.

[0043] It should be noted that in this implementation, the outer wall of the guide rod 4-3 is provided with a scale for reading the lifting stroke of the lifting test mechanism 4; in addition, the length of the guide rod 4-3 is greater than the length of the connecting rod 4-9, so as to facilitate the lifting of the underwater vehicle model 6 to the water surface for installation or disassembly. Furthermore, the upper connecting plate 4-7, the lower connecting plate 4-8, the bottom connecting plate 4-10, and the transition connector 4-11 may be provided with lightening holes.

[0044] Furthermore, in one implementation of this invention, such as Figure 1 and Figure 5 As shown, based on the above embodiments of the present invention, the resistance testing device provided by the present invention may further include: an underwater rectifier assembly 5 covering the non-moving structure at the lower part of each lifting test mechanism 4.

[0045] In this implementation, the number of underwater rectification components 5 is the same as that of the lifting test mechanism 4; each underwater rectification component 5 includes: a connecting flange 5-1, a fairing 5-2, a reinforcing rib 5-3, and a retainer 5-4. The fairing 5-2 has a spindle-shaped overall cross-section and is divided into two halves that cover the outside of the lower model connecting component of the lifting test mechanism 4; the top surface of the fairing 5-2 is fixedly connected to the connecting flange 5-1, for example, the outer arc surface of the top of the fairing 5-2 is welded to the connecting flange 5-1, and is fixedly connected to the bottom of the lower connecting plate 4-8 through the connecting flange 5-1.

[0046] In this implementation, multiple reinforcing ribs 5-3 and retainers 5-4 are welded to the inside of the fairing 5-2. The reinforcing ribs 5-3 and retainers 5-4 are equidistant and evenly distributed. The ends of both sides of the reinforcing ribs 5-3 are provided with countersunk holes for fixing with locking screws. The depth of the countersunk holes is greater than the height of the screw nuts. The distance between the front and rear support arms inside the retainer 5-4 is the same as the distance between the two connecting rods 4-9, which is used to fix the front and rear support arms in contact with the outer circle of the connecting rods 4-9.

[0047] It should be noted that the curvature of the arc surfaces of fairing 5-2, reinforcing rib 5-3, and cage 5-4 is the same as the curvature of the inner arc surface of connecting flange 5-1.

[0048] The working principle of the drag testing device for variable depth underwater vehicles provided in this embodiment of the invention is as follows: Based on the length of the underwater vehicle model 6, slide the motion support platform 3 forward and backward on the support frame 2 to adjust it to a position matching the underwater vehicle model 6. Turn the locking handle 3-3 to fix each motion support platform 3 on the support frame 2. Tighten the fastening components 3-5, nut 3-6, and screw 3-7 against the motion support platform 3 to prevent displacement of the motion support platform 3 during the test. Loosen the set screw on the upper shaft support 4-4-1 to release the vertical degree of freedom of the guide rod 4-3. Turn the handwheel 4-2 forward, and the lifting screw 4-1 will drive the lifting test mechanism 4 and the underwater rectification assembly 5 to rise as a whole. After rising to near the water surface, connect the underwater vehicle model 6 to the model connecting plate 4-13.

[0049] After the model is installed, turn the handwheel 4-2 in the opposite direction. The lifting screw 4-1 will drive the lifting test mechanism 4, the underwater rectifier assembly 5, and the underwater vehicle model 6 to descend as a whole. After descending to the required diving depth for the test, tighten the set screw on the upper shaft support 4-4-1 to hold and lock the guide rod 4-3 tightly through the upper shaft support 4-4-1.

[0050] The drag testing device for a variable depth underwater vehicle provided by the present invention includes a hydrodynamic test trailer 1 with a fixed support frame 2 at the bottom, a moving bearing platform 3 fixedly mounted on the support frame 2, and a lifting test mechanism 4 with lifting capabilities mounted on the moving bearing platform 3. The lifting test mechanism 4 realizes the lifting function of the underwater vehicle model 6 connected to the bottom through its upper lifting structure, so as to realize the installation or disassembly of the underwater vehicle model 6 on the water surface, as well as the raising and lowering of the underwater vehicle model 6 during the test.

[0051] The drag testing device for variable-depth underwater vehicles provided by this invention allows for the model to be raised to the surface at any time during the test to check and change its test status, and also enables the test model to be positioned at the required diving depth according to research needs. This is of great significance for the study of the speed of underwater vehicles. The technical solution provided by this invention has the following beneficial effects: First, it has a reliable structure and strong longitudinal load-bearing capacity. Based on the force characteristics, the resistance test device adopts a longitudinal bearing layout, with two sets of six shafts arranged longitudinally to bear the resistance in the navigation direction; in addition, the top motion bearing platform 3 is designed as a box structure, which can better bear the bending moment of the slender resistance test device; the underwater vehicle model 6 is fixed by a front and rear working method to avoid vibration of the underwater vehicle model 6 during high-speed movement.

[0052] Secondly, the surface is smooth, and the testing accuracy is high. The underwater part of the resistance test device is built into the smooth underwater rectifier assembly 5. The test transmission cables are all connected to the bottom sensor through the light reduction hole and the inside of the flow guide shroud of the device. The test has little impact on the flow field, and the built-in sensor is not affected by the external water flow. The test accuracy is high.

[0053] Third, it is simple to operate and has high testing efficiency. During the experiment, the lifting test mechanism 4 can be used to lift the model to the water surface, and the tester can change the test state on the water surface. The lifting mechanism can also be used to place the model at the required water depth. The operation is simple and the test efficiency is high.

[0054] Fourth, it has strong adaptability and wide application. The resistance testing device can adjust the distance between the two sets of moving bearing platforms 3 back and forth, and can simultaneously adjust the diving depth up and down. This resistance testing device can be used to carry out resistance tests on models of different lengths and models with different diving depth requirements.

[0055] The resistance testing device provided by this invention has been applied in the field of speed research in towed pools, and has been used to conduct resistance testing technology research on multiple underwater vehicle models, providing sufficient technical support for the speed research of underwater vehicles.

[0056] While the embodiments disclosed in this invention are as described above, they are merely illustrative of the embodiments to facilitate understanding of the invention and are not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in the form and details of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection of this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A drag testing device for a variable depth underwater vehicle, characterized in that, include: Hydrodynamic test trailer (1), support frame (2), underwater vehicle model (6), and at least one corresponding motion bearing platform (3) and lifting test mechanism (5); Among them, the bottom of the hydrodynamic test trailer (1) is fixedly suspended and installed with a support frame (2), and two sets of guide rail assemblies are symmetrically arranged on both sides of the bottom of the central axis of the hydrodynamic test trailer (1). The top of the two sets of guide rail assemblies are respectively fixedly installed with guide rails (2-2), and the groove of the guide rails (2-2) is provided with freely sliding sliders (2-3); the two sets of slider connection structures fixedly installed on both sides of the bottom end of the motion bearing platform (3) are fixedly connected with the sliders in the guide rails (2-2) on both sides, and the locking assembly configured inside them is used to lock and fix the motion bearing platform (3) and the support frame (2); The lifting test mechanism (5) passes through the middle of the motion bearing platform (3) through the lifting screw (4-1) set at the top, and a handwheel (4-2) is set at the top of the motion bearing platform (3) to cooperate with the lifting screw (4-1) to implement the screw movement; the lifting test mechanism (5) is fixedly connected to the underwater vehicle model (6) through the model connection component at its lower part, and the model connection component and the underwater vehicle model (6) are vertically raised or lowered by the action of the lifting screw (4-1) through the handwheel (4-2) so as to realize the installation or disassembly of the underwater vehicle model (6) on the water surface, as well as the raising and lowering of the underwater vehicle model (6) during the test.

2. The drag testing apparatus for a variable depth underwater vehicle according to claim 1, characterized in that, Each set of guide rail assemblies in the support frame (2) includes: box girder (2-1), guide rail (2-2), and slider (2-3); The box girder (2-1) is a hollow frame beam structure. The two box girders (2-1) are arranged on both sides of the bottom of the central axis of the hydrodynamic test trailer (1). The two ends of the two box girders (2-1) are fixedly connected by front and rear end plates respectively. The hydrodynamic test trailer (1) is suspended and connected to the support frame (2) through the front and rear end plates, so that the top surface of the support frame (2) is flush with the water surface. The top of each box girder (2-1) is fixedly installed with guide rails (2-2) by screws. The cross section of each guide rail (2-2) is an inverted T-shaped structure. A slider (2-3) is embedded in the groove cavity of the guide rail (2-2). The cross section of the slider (2-3) is slightly smaller than the cross section of the groove cavity of the guide rail (2-2), so that the slider (2-3) can slide in the guide rail (2-2).

3. The drag testing apparatus for a variable depth underwater vehicle according to claim 2, characterized in that, Each set of the motion bearing platform (3) includes: two sets of slider connection structures, locking handle (3-3), and bearing structure (3-4); The bearing structure (3-4) is a combined box structure, including a bearing plate and a bearing box fixedly installed at the bottom center of the bearing plate. Two sets of slider connection structures are fixedly installed on both sides of the bottom of the bearing plate. The locking handle (3-3) that passes through the bearing plate and the slider connection structure is connected to the slider (2-3) nested in the guide rails (2-2) on both sides, so as to realize the fixed connection between the motion bearing platform (3) and the support frame (2). In addition, the bearing plate and the bearing box are provided with through holes for assembly with the lifting screw (4-1) and each guide rod (4-3) in the lifting test mechanism (5).

4. The drag testing apparatus for a variable depth underwater vehicle according to claim 3, characterized in that, The two sets of slider connection structures are: guide rail (3-1) and rail pressure block (3-2). The guide rail (3-1) and the rail block (3-2) are equidistantly arranged on both sides of the bottom of the bearing plate. The guide rail (3-1) is provided with a groove that matches the upper surface of the guide rail (2-2). The rail block (3-2) is set as a flat plate support structure. The groove of the guide rail (3-1) is engaged with the outer edge of the upper surface of the guide rail (2-2) and plays a guiding role when the moving bearing platform (3) slides. The groove plane of the guide rail (3-1) is flush with the bottom surface of the rail block (3-2) to ensure that the moving bearing platform (3) is flush with the water surface.

5. The drag testing apparatus for a variable depth underwater vehicle according to claim 3, characterized in that, The four corners of the bearing plate are provided with through holes. The screw of each set of locking handles (3-3) passes through the through holes at the four corners of the bearing plate and the through holes of the corresponding slider connection structure, and is threadedly connected to the slider (2-3) in the inner cavity of the guide rail (2-2). By screwing the handle placed on the upper end of the bearing plate to lock the slider (2-3) and the slider connection structure of the guide rail (2-2), the outer wall of the slider (2-3) is tightly attached to the guide rail (2-2), thereby fixing the moving bearing platform (3) on the support frame (2).

6. The drag testing apparatus for a variable depth underwater vehicle according to claim 3, characterized in that, Each set of motion bearing platform (3) also includes: multiple sets of auxiliary fastening components; on each box girder (2-1), a set of auxiliary fastening components is fixedly installed at both the front and rear ends of each set of motion bearing platform (3); Each set of auxiliary fastening components includes: fastening component (3-5), nut (3-6), and screw (3-7); two fastening components (3-5) are symmetrically clamped on both sides of the box girder (2-1), the inner fastening component (3-5) is close to the front or rear face of the load-bearing structure (3-4), and the outer fastening component (3-5) is close to the outer side of the box girder (2-1). Two screws (3-7) pass through the upper and lower through holes of the two fastening components (3-5) respectively, and the fastening components (3-5) on both sides are locked and fixed by a nut (3-6) on each screw (3-7).

7. The drag testing apparatus for a variable depth underwater vehicle according to claim 3, characterized in that, Each lifting test mechanism (5) includes: lifting screw (4-1), handwheel (4-2), guide rod (4-3), linear bearing (4-5), connecting base (4-6), upper connecting plate (4-7), lower connecting plate (4-8), connecting rod (4-9), bottom connecting plate (4-10), transition connector (4-11), force sensor (4-12), model connecting plate (4-13), and upper shaft support (4-4-1), middle shaft support (4-4-2), and lower shaft support (4-4-3). The upper connecting plate (4-7) is embedded in the groove of the lower connecting plate (4-8) and fixedly connected by screws; the middle of the upper end face of the upper connecting plate (4-7) is fixedly connected to the bottom end of the lifting screw (4-1) through a fixedly installed connecting base (4-6); a guide rod (4-3) is fixedly connected to the front and rear sides of the upper end face of the upper connecting plate (4-7) through a fixedly installed central shaft support (4-4-2); the lifting screw (4-1) and the guide rod (4-3) pass through corresponding positions on the bearing structure (3-4). The through hole, the lifting screw (4-1) extends out of the upper end face of the bearing plate and is threadedly connected to the bottom flange of the handwheel (4-2), and is used to implement the lifting and lowering action of the lifting test mechanism (5) by rotating the handwheel (4-2); each guide rod (4-3) passes through the linear bearing (4-5) fixedly installed in the bearing box and the upper shaft support (4-4-1) fixedly installed on the upper end face of the bearing plate to ensure the guiding position of the guide rod (4-3) and play a guiding role in the lifting test mechanism (5) during the rising or falling movement; The lower connecting plate (4-8) is connected to the top of the connecting rod (4-9) through the lower shaft support (4-4-3) fixedly installed on the front and rear sides of its bottom end. The bottom end of each connecting rod (4-9) is connected to the lower shaft support (4-4-3) fixedly installed on the upper surface of the bottom connecting plate (4-10). The force sensor (4-12) is fixedly connected to the bottom end of the bottom connecting plate (4-10) through the transition connector (4-11). The model connecting plate (4-13) fixedly installed at the bottom end of the force sensor (4-12) is used to fixally connect the underwater vehicle model (6).

8. The drag testing apparatus for a variable depth underwater vehicle according to claim 7, characterized in that, The outer wall of the guide rod (4-3) is provided with a scale for reading the lifting stroke of the lifting test mechanism (5); the length of each guide rod (4-3) is greater than the length of the connecting rod (4-9) so as to facilitate the lifting of the underwater vehicle model (6) to the water surface for installation or disassembly.

9. The drag testing apparatus for a variable depth underwater vehicle according to claim 8, characterized in that, Also includes: At least one set of underwater rectifier components (5) is installed outside the lower model connection components of each lifting test mechanism (5); Each underwater rectification assembly (5) includes: a connecting flange (5-1), a fairing (5-2), a reinforcing rib (5-3), and a retainer (5-4); the fairing (5-2) has a spindle-shaped overall cross section and is divided into two halves that cover the outside of the lower model connecting assembly of the lifting test mechanism (5); the top surface of the fairing (5-2) is fixedly connected to the connecting flange (5-1) and fixedly connected to the bottom end of the lower connecting plate (4-8) through the connecting flange (5-1); Multiple reinforcing ribs (5-3) and retainers (5-4) are welded to the inside of the fairing (5-2). The reinforcing ribs (5-3) and retainers (5-4) are equidistant and evenly distributed. The distance between the front and rear support arms on the retainer (5-4) is the same as the distance between the two connecting rods (4-9), which is used to fix the front and rear support arms in contact with the outer circle of the connecting rods (4-9) through the concave semicircles of the front and rear support arms.

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