A non-contact electromagnetically driven hydrodynamic noise testing system

Abstract

This invention relates to a non-contact electromagnetically driven hydrodynamic noise testing system, comprising a pressure-resistant still water chamber and a non-contact towing module. The non-contact towing module includes a model carrier, a magnetic levitation stator unit, and an electromagnetic propulsion unit. The magnetic levitation stator unit suspends the model carrier on the trough rail, and the electromagnetic propulsion unit moves the model carrier via electromagnetic force. The magnetic levitation stator unit has two sets of float permanent magnet arrays; the line connecting the north and south poles of the float permanent magnet arrays is inclined relative to the horizontal plane, so that the repulsive force of like poles is decomposed into a vertical levitation component and a horizontal guiding component. This invention achieves non-contact levitation linear motion of the model through a pressure-resistant still water chamber using electromagnetic drive and magnetic levitation. The trough rail limit reduces lateral disturbance, and the electromagnetic propulsion is uniform and non-contact, completely eliminating mechanical friction noise, significantly optimizing the flow field environment, providing high-precision conditions with extremely low background noise for testing the hydrodynamic and underwater acoustic performance of underwater vehicles, and realizing undisturbed testing in completely still water.

Description

Technical Field

[0001] This invention belongs to the technical field of fluid mechanics experimental equipment, and in particular relates to a non-contact electromagnetically driven hydrodynamic noise testing system. Background Technology

[0002] The water tunnel is a core piece of equipment for evaluating the hydrodynamic and acoustic performance of underwater vehicles on land. Unlike surface ships, underwater vehicles operate at full depth in a completely wet surface environment without free surface or ventilated bubbles. The low-frequency line spectrum of their propellers, the flow noise of the hull, and the boundary layer pulsating pressure must be tested under "full-depth" conditions of high static pressure and high Reynolds number. Therefore, the test section must be able to simulate the "infinite domain" boundary conditions of deep water, and the background noise must be lower than the measured signal; otherwise, the faint detectable features of targets in the real ocean will be obscured.

[0003] The circulating water tunnel, driven by a pump, continuously circulates water in a closed loop. While this creates a stable flow, its noise generation mechanism is complex and difficult to eliminate: When the pump impeller rotates, the interaction between the blades and the water flow generates periodic pressure pulsations, creating line spectrum noise; motor vibration is transmitted to the tunnel walls through the shaft system, inducing structural vibration radiation noise; changes in velocity direction and magnitude as the water flows through corners and guide vanes trigger turbulent pulsations, generating broadband flow-induced noise; and sound waves are reflected multiple times within the closed loop, creating a reverberation effect that further amplifies the noise. These noises propagate through the water flow and structural paths, superimposing on the target signal of the submersible model, making it difficult to accurately distinguish pressure pulsations and far-field noise on the model surface, severely impacting the assessment of the submersible's noise characteristics.

[0004] Towed water tunnels avoid water-driven noise by using still water to move the model. However, the mechanical guide rail system introduces new interference: the sliding or rolling friction between the guide rail slider and the track generates broadband mechanical noise during towing. This noise is transmitted to the model through the solid structure and then radiated into the water through the model surface, forming an additional sound source. At the same time, the towing structure and its attachments, as solid boundaries immersed in the water, disturb the surrounding water when the model is being towed, inducing wake vortex shedding and local turbulence. These disturbances are transported downstream along with the model's movement, directly altering the flow field characteristics around the model, leading to premature boundary layer transition and distorted pulsating pressure distribution. Therefore, for fully submersible underwater vehicles with extremely high requirements for noise and flow field quality, existing towed water tunnels still cannot provide a testing environment that meets the needs of deep-water silent performance evaluation. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the technical problems in the related art.

[0006] Therefore, one aspect of this application proposes a non-contact electromagnetically driven hydrodynamic noise testing system:

[0007] A pressure-resistant still water chamber, wherein the inner cavity of the pressure-resistant still water chamber is completely filled with water and there is no free liquid surface, and the wall of the pressure-resistant still water chamber is provided with a trough rail extending laterally.

[0008] A non-contact towing module, located within the pressure-resistant still water tank, and comprising:

[0009] A model support frame is used to secure the model under test; the main float of the model support frame is suspended in the sump rail without contact.

[0010] The magnetic levitation stator unit includes a float permanent magnet array attached to the model support frame and an excitation coil array attached to the sump rail. The two generate spatial repulsion through electromagnetic-permanent magnet coupling, so that the model support frame remains in a suspended state without mechanical contact within the sump rail.

[0011] The electromagnetic propulsion unit includes a permanent magnet array of a mover attached to the model support frame and a traveling wave coil array attached to the pressure-resistant still water tank. When the traveling wave coil array is energized, it generates an alternating magnetic field that travels laterally. The alternating magnetic field interacts with the permanent magnet array of the mover to generate a continuous propulsive force, thereby driving the model support frame and the model it is fixed to to make non-contact linear motion laterally.

[0012] The magnetic levitation stator unit has two sets of float permanent magnet arrays, which are symmetrically arranged on both sides of the main float. The line connecting the north and south poles of the float permanent magnet array is inclined relative to the horizontal plane so that the repulsive force of the same poles is decomposed into a vertical levitation component and a horizontal guiding component.

[0013] In this technical solution, the structural design utilizes electromagnetic drive and magnetic levitation within a pressure-resistant still water chamber to achieve contactless suspension and non-contact linear motion of the model in completely still water. The pressure-resistant still water chamber provides a still water environment without free liquid surfaces, eliminating background noise from pumps and impellers in the circulating water tunnel. The trough rail confines the movement of the model's support frame within the trough, significantly reducing direct disturbance to the surrounding water during model movement. Simultaneously, the concave design of the trough rail avoids localized eddies caused by wall protrusions. The magnetic levitation stator unit achieves contactless suspension through electromagnetic-permanent magnet coupling, eliminating frictional noise from traditional mechanical guide rails and providing lateral constraint force to further reduce lateral disturbance. The electromagnetic propulsion unit generates uniform thrust through a traveling wave coil array outside the chamber wall, avoiding periodic pressure disturbances caused by traditional mechanical transmission, ensuring smooth model movement within the trough and minimizing disturbance to the water. The overall design not only completely eliminates mechanical friction noise but also significantly optimizes the flow field environment of the test section, providing extremely low background noise and high-precision testing conditions for the hydrodynamic and acoustic performance testing of underwater vehicles.

[0014] In some embodiments, the excitation coil array is provided on both sides of the float permanent magnet array, so that the float permanent magnet array is located between the two sets of excitation coil arrays.

[0015] In the technical solution, the structural design forms a "double-sided sandwich" electromagnetic levitation structure by symmetrically arranging excitation coil arrays on both sides of the float permanent magnet array. On the one hand, the two repulsive forces generated between the excitation coils on both sides and the float permanent magnet array in the middle can be superimposed. The difference between the two repulsive forces can more accurately adjust the magnitude and direction of the levitation force, ensuring that the model support frame remains stably suspended in the trough rail. On the other hand, the constraint forces on both sides form a constraint, which not only effectively prevents the support frame from derailing inward during movement, but also achieves high-precision levitation and a stable running trajectory without the need for additional mechanical limiting devices, further improving the reliability and testing accuracy of the system. It can also suppress the jumping generated during the movement of the support frame, reduce the flow field disturbance and noise induced by levitation fluctuations, and ensure the high precision and repeatability of the hydrodynamic-noise joint test of the deep-sea submersible.

[0016] In some embodiments, the excitation coil array of the magnetic levitation stator unit is composed of multiple coil elements arranged continuously in the transverse direction, and each coil element presents the same polarity on the side facing the float permanent magnet array after being energized, so as to form a levitation magnetic field with a constant direction.

[0017] The float permanent magnet array is composed of multiple permanent magnet elements arranged continuously in the horizontal direction, and each permanent magnet element presents the same polarity on the side facing the excitation coil array so as to maintain the same pole and repel the levitation magnetic field.

[0018] In the technical solution, the structural design ensures that permanent magnet elements and coil elements always maintain a repulsive force at any position where the support frame moves laterally, ensuring that the levitation force has no dead zones and no pulsations. Multiple sets of permanent magnet elements and coil elements are always in relative position between the float permanent magnet array and the magnetic levitation stator unit. After the superposition of multiple sets of repulsive forces, the levitation force per unit length is significantly increased, directly improving the load capacity of the system. At the same time, the continuous distribution of repulsive forces acts like a "magnetic pad" to fully support the support frame, suppressing shaking and jumping during movement, keeping the model running smoothly, further reducing the flow field disturbance and noise induced by levitation fluctuations, and ensuring the high accuracy and repeatability of the hydrodynamic-noise joint test of the deep-sea submersible.

[0019] In some embodiments, the permanent magnet array of the electromagnetic propulsion unit consists of a plurality of permanent magnet elements arranged continuously in the transverse direction, and each permanent magnet element is distributed with alternating N and S poles on the side facing the traveling wave coil array.

[0020] The traveling wave coil array consists of multiple coil elements arranged continuously in the transverse direction, and each coil element, after being energized, forms a traveling wave magnetic field with alternating N and S poles on the side facing the moving permanent magnet array.

[0021] Any permanent magnet element is simultaneously opposite to two adjacent coil elements, so that the moving permanent magnet array continuously obtains a non-contact driving force in the lateral direction under the push-pull action of alternating polarity magnetic fields.

[0022] In the technical solution, the structural design uses a continuous arrangement of both the permanent magnet array and the traveling wave coil array with alternating polarities of NSNS, and the pitch of the permanent magnet segment corresponds one-to-one with the pole pitch of the coil. This allows the traveling wave magnetic field to generate a superimposed electromagnetic force of "pull forward and push backward" on the entire row of permanent magnet segments every time it moves forward by one pole pitch. This phase matching ensures that each permanent magnet is always at the point of maximum thrust, achieving continuous drive without dead zones or pulsations across the entire range. The rate of change of magnetic flux per unit length is doubled, and the thrust is multiplied under the same current. As a result, the support frame can maintain low noise and stable operation at higher speeds or with greater loads, meeting the requirements of high thrust and low disturbance for high Reynolds number tests of deep-sea submersibles.

[0023] In some embodiments, the main float is provided with inclined wing arms at both ends in the longitudinal direction, which are inclined relative to the horizontal plane; the float permanent magnet array is fixed to the corresponding inclined wing arm and perpendicular to the surface of the wing arm, so that the float permanent magnet array forms an angle with the horizontal plane.

[0024] In the technical solution, the structural design uses inclined wing arms to keep the permanent magnet array of the float at a fixed acute angle with the horizontal plane. The repulsive force is instantaneously decomposed into two orthogonal components: "floatation" and "centering". Only one set of permanent magnet-coil pairs is used to complete the dual functions of suspension and lateral restraint, eliminating the need for independent guide magnets or mechanical shoulders required by traditional solutions. The inclined wing arms can be made by bending, and the main float can be made into a continuous thin plate. The cross-sectional height is reduced, the water-facing area and the intensity of the wake vortex are reduced simultaneously, the flow field around the model is more uniform, and the background noise is reduced accordingly, providing test conditions with a higher signal-to-noise ratio for deep-sea submersibles.

[0025] In some embodiments, two longitudinally symmetrical guide cavities are formed within the trough rail, and the tilting wings are suspended in the corresponding guide cavities without contact, and the excitation coil array is arranged on both sides of the guide cavities.

[0026] In the technical solution, the structural design uses a guide cavity to completely enclose the tilting wing arm, leaving only the connecting model part exposed. This allows the width of the trough rail opening to be compressed to the limit, and the water-facing area and flow resistance of the model support frame to be reduced simultaneously. This significantly reduces the obstruction area and the intensity of the wake vortex during towing, resulting in a smoother water flow in the model area and a further reduction in background noise in the test section. The two sides of the cavity wall directly form the mounting base for the excitation coil array, thus achieving the integration of "single permanent magnet - double coil" suspension and anti-detachment.

[0027] In some embodiments, the side walls of the trough rail gradually narrow from the trough opening to the trough bottom to form an inclined inner surface.

[0028] In the technical solution, the structural design uses the side walls of the sump rail to slope and narrow from the sump opening to the bottom of the sump, forming a continuously transitioning chamfered inner surface, so that there are no abrupt steps between the sump rail and the pressure still water tank wall. This smooth connection eliminates boundary layer separation points, suppresses local eddies and turbulent pulsations, significantly reduces water flow disturbance caused by structural abrupt changes, ensures uniform flow field at the model inlet, and improves the accuracy and repeatability of hydrodynamic and noise tests.

[0029] In some embodiments, the float permanent magnet array and the mover permanent magnet array are both located inside the trough rail, and the excitation coil array and the traveling wave coil array are both located outside the bulkhead of the pressure still water tank.

[0030] In the technical solution, the structural design moves all the coils outward to keep the inner wall of the cabin intact and smooth, eliminates the local eddy currents caused by structural protrusions, and enables external maintenance, thereby improving the system lifespan. Only permanent magnets are left in the slot rail cavity and the exposed area is minimized, which greatly reduces water resistance and wake vortices during towing, and ensures uniform flow field and reduced background noise in the model area.

[0031] In some embodiments, the model support frame further includes a longitudinal extension arm and a model adapter; the longitudinal extension arm extends perpendicular to the main float and toward the interior of the cabin, and the model adapter is located at the inner end of the longitudinal extension arm; the main float, the longitudinal extension arm, and the model adapter are all plates extending laterally.

[0032] In the technical solution, the structural design is formed by vertically connecting the longitudinal extension arm to the model adapter seat to form a high-rigidity, low-inertia cantilever beam, which not only ensures the stability of the model cantilever but also minimizes the water-facing area. The plate surface is arranged in the direction of the flow to suppress the shedding of the wake vortex and drag pulsation, resulting in fast acceleration and deceleration response and low energy consumption, providing high-fidelity hydrodynamic and noise data for the submersible.

[0033] In some embodiments, the electromagnetic propulsion unit is further provided with a streamlined shield; the streamlined shield covers the moving permanent magnet array laterally, and has drag-reducing sections with smooth transitions at both ends.

[0034] In the technical solution, the structural design uses a streamlined shield to completely cover the permanent magnet array of the mover and smoothly transition at both ends, so that the permanent magnet area is continuously connected with the surrounding wall, which significantly reduces local flow around and vortex shedding; at the same time, it blocks the adsorption of ferromagnetic impurities, prevents magnetic force attenuation and additional noise sources, ensures the long-term stability of electromagnetic driving force, and further improves the uniformity of the flow field in the test section and the signal-to-noise ratio of the test.

[0035] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0036] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0037] Figure 1 This is a frontal perspective structural view of the non-contact electromagnetically driven hydrodynamic noise testing system according to an embodiment of this application, with the end face of the pressure-resistant static water chamber hidden.

[0038] Figure 2 This is a front perspective structural schematic diagram of the model support frame of the non-contact electromagnetically driven hydrodynamic noise test system according to an embodiment of this application;

[0039] Figure 3 A perspective view of a partially exploded model support frame of a non-contact electromagnetically driven hydrodynamic noise testing system according to an embodiment of this application;

[0040] Figure 4 This is a schematic diagram of the electromagnetic drive assembly of a non-contact electromagnetically driven hydrodynamic noise testing system according to an embodiment of this application.

[0041] In the diagram: 1. Pressure-resistant still water chamber; 11. Sump rail; 111. Guide cavity; 2. Non-contact towing module; 21. Model support frame; 211. Inclined wing arm; 212. Main float; 213. Longitudinal extension arm; 214. Model adapter; 22. Maglev stator unit; 221. Float permanent magnet array; 222. Excitation coil array; 23. Electromagnetic propulsion unit; 231. Mover permanent magnet array; 232. Traveling wave coil array; 233. Streamlined shield; 3. Model. Detailed Implementation

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0043] In the description of this invention, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] like Figures 1 to 4 As shown, in an illustrative embodiment of the non-contact electromagnetically driven hydrodynamic noise testing system of the present invention, the non-contact electromagnetically driven hydrodynamic noise testing system includes a pressure-resistant still water chamber 1 and a non-contact towing module 2.

[0047] The pressure-resistant water-susceptible chamber 1 is typically a straight, fully enclosed pressure-resistant rectangular cavity extending horizontally. The pressure-resistant water-susceptible chamber 1 is completely filled with water, meaning its interior is completely filled with degassed pure water, with no free surface or air bubbles remaining, and its inner surface is smooth. The pressure-resistant water-susceptible chamber 1 usually has a hatch at one end horizontally, allowing its interior to be opened or closed, enabling the underwater vehicle model 3 used for hydrodynamic experiments to be placed inside or removed from the pressure-resistant water-susceptible chamber 1. The pressure-resistant water-susceptible chamber 1 typically has an inlet and an outlet for filling it with water and simultaneously venting any gas inside.

[0048] The non-contact towing module 2 is installed inside the pressure-resistant still water tank 1. The model 3 is usually fixed on the non-contact towing module 2, so that the model 3 can move laterally in the water environment inside the pressure-resistant still water tank 1 under the drive of the non-contact towing module 2, thereby simulating the movement of the model 3 in water, and conducting fluid dynamics experiments on the model 3.

[0049] The walls of the pressure-resistant still water chamber 1 have transversely arranged tracks, allowing the non-contact towing module 2 to move the model 3 laterally. These transversely arranged tracks typically extend from one end of the pressure-resistant still water chamber 1 to the other, ensuring sufficient travel distance for the model 3 to move from one end to the other under the influence of the non-contact towing module 2.

[0050] The non-contact towing module 2 includes a model support frame 21. The model support frame 21, typically a support structure, is the core component used to connect and tow the model 3, enabling the model 3 to move and supporting it at the center of the pressure-resistant still water tank 1. As the model 3 moves at the center of the pressure-resistant still water tank 1, the distance between the model 3 and the inner surfaces of the pressure-resistant still water tank 1 is approximately the same, and the thickness of the water around the model 3 is approximately the same, thus forming a uniform annular flow channel around the model 3. This eliminates eccentric eddies and local acceleration, ensuring symmetrical and accurate measurements of drag and pulsating pressure, while also ensuring consistent boundary layer development and uniform acoustic wave propagation impedance. This suppresses pseudo-vibration noise and acoustic reflection, improves the signal-to-noise ratio of the hydrophone, and achieves hydrodynamic-noise joint testing accuracy that more closely matches the actual operating conditions of a deep-sea submersible. Furthermore, the model support frame 21 is mounted on a track, allowing it to move laterally under the guidance of the track, thereby moving the model 3 laterally.

[0051] The non-contact towing module 2 also includes a magnetic levitation stator unit 22. The magnetic levitation stator unit 22 includes a float permanent magnet array 221 and an excitation coil array 222. The float permanent magnet array 221 is typically composed of permanent magnets and is mounted on the model support frame 21. The excitation coil array 222 is typically composed of electromagnets and is mounted on the track. The line connecting the two magnetic poles of the float permanent magnet array 221 is usually parallel to the line connecting the two magnetic poles of the excitation coil array 222 after it is energized, so that the float permanent magnet array 221 and the excitation coil array 222 can be set relative to each other. The same magnetic poles of the float permanent magnet array 221 and the excitation coil array 222 are set relative to each other. Through electromagnetic-permanent magnet coupling, the two generate a repulsive force by repulsion between like poles. The excitation coil array 222, which is fixed on the track, supports the weight of the model 3, the model support frame 21 and the float permanent magnet array 221 through the repulsive force, so that the model support frame 21 is suspended on the track without contact. That is, when the model support frame 21 moves along the track, the model support frame 21 will not contact the track, and a certain gap is always maintained between the two. Furthermore, as the float permanent magnet array 221 moves along with the model carrier 21, the excitation coil array 222 typically extends laterally from one end of the pressure-resistant static water chamber to the other end. This ensures that as the model carrier 21 moves along the track, the float permanent magnet array 221 is always able to generate a repulsive force relative to the excitation coil array 222, keeping the model carrier 21 suspended relative to the track during its movement.

[0052] The non-contact towing module 2 also includes an electromagnetic propulsion unit 23. The electromagnetic propulsion unit 23 includes a mover permanent magnet array 231 and a traveling wave coil array 232. The mover permanent magnet array 231 is typically composed of permanent magnets and is mounted on the model support frame 21. The traveling wave coil array 232 is typically composed of electromagnets and is mounted on the pressure-resistant still water chamber 1. The line connecting the two poles of the mover permanent magnet array 231 is typically parallel to the line connecting the two poles of the traveling wave coil array 232 after it is energized, allowing the mover permanent magnet array 231 and the traveling wave coil array 232 to be positioned opposite each other. The traveling wave coil array 232 typically extends laterally from one end of the pressure-resistant still water chamber to the other, and on the side closest to the mover permanent magnet array 231, the poles of the electromagnets in the traveling wave coil array 232 are alternately arranged laterally. One permanent magnet in the mover permanent magnet array 231 is typically simultaneously opposite two adjacent electromagnets in the traveling wave coil array 232.

[0053] The electromagnetic propulsion unit 23 fixes the mover permanent magnet array 231 to the model support frame 21 and continuously arranges the electromagnets of the traveling wave coil array 232 along the transverse direction (the direction of travel of model 3). After the electromagnets of the traveling wave coil array 232 are energized, an alternating polarity of NSNS… is formed on the side near the mover permanent magnet array 231, which is equivalent to a "traveling wave magnetic field" set along the transverse direction. The line connecting the two poles of the permanent magnets in the mover permanent magnet array 231 is parallel to the magnetic field axis of the electromagnets in the traveling wave coil array 232. A single permanent magnet is simultaneously connected to two adjacent electromagnets. Therefore, the N pole of a permanent magnet in the mover permanent magnet array 231 facing the traveling wave coil array 232 is always attracted by the S pole of the electromagnet in front of the traveling wave coil array 232 and repelled by the N pole of the electromagnet behind the traveling wave coil array 232. If the permanent magnet of the mover permanent magnet array 231 faces the S pole of the traveling wave coil array 232, the opposite is true. The two sets of forces combine to generate a continuous thrust along the transverse direction. As the magnetic poles of each electromagnet in the traveling wave coil array 232 continuously change phase, the magnetic field wave continuously shifts laterally. When one permanent magnet of the moving permanent magnet array 231 moves forward to the next group of two adjacent electromagnets in the traveling wave coil array 232, the two adjacent electromagnets in the next group switch from facing the permanent magnet of the moving permanent magnet array 231 with the N pole of the front electromagnet and the S pole of the rear electromagnet facing the permanent magnet of the moving permanent magnet array 231, to facing the permanent magnet of the moving permanent magnet array 231 with the S pole of the front electromagnet and the N pole of the rear electromagnet. When the permanent magnet of the moving permanent magnet array 231 moves forward to the next group of two adjacent electromagnets in the traveling wave coil array 232, it is still attracted by the S pole of the front electromagnet and repelled by the N pole of the rear electromagnet. During the process of moving the permanent magnet of the moving permanent magnet array 231 laterally forward, it is always "pushed" forward by the resultant force of the attraction and repulsion, so that the model support frame 21 is suspended on the track and moves along the track without contact.

[0054] The track on the wall of the pressure tank 1 is a recessed trough track 11. The main float 212 of the model support frame 21 is set in the trough track 11, thus partially concealing the model support frame 21 within the trough space. The remaining part of the model support frame 21 extends inward toward the center of the pressure tank 1, thereby connecting to and supporting the model 3.

[0055] The magnetic levitation stator unit 22 has two sets of float permanent magnet arrays 221, which are symmetrically arranged and respectively located at both ends of the main float 212 in the longitudinal direction. The line connecting the north and south poles of the float permanent magnet arrays 221 is inclined relative to the horizontal plane, so that the repulsive force generated between the float permanent magnet arrays 221 and the excitation coil array 222 in the magnetic levitation stator unit 22 through electromagnetic-permanent magnet coupling is inclined relative to the horizontal plane. The track is usually set on the inner surface of the bottom of the pressure-resistant still water tank 1. The inclined repulsive force can be decomposed into horizontal and vertical components. The vertical component is used to provide vertical support for the model carrier, so that the model carrier is suspended on the track and the two do not contact each other. The horizontal component is located in the longitudinal direction and is used to provide guiding force for the movement of the model carrier 21 along the track, so as to avoid longitudinal swaying when the model carrier 21 moves laterally, and ensure that the lateral movement trajectory of the model carrier 21 is in a straight line. Two repulsive horizontal components are generated on both sides of the main float 212. The two horizontal components are in opposite directions, thus correcting the lateral movement of the model support frame 21 in two longitudinal directions, thereby ensuring that the model support frame 21 will not deviate to the left or right when it moves laterally.

[0056] This structural design utilizes electromagnetic drive and magnetic levitation within the pressure-resistant still water chamber 1 to achieve contactless suspension and non-contact linear motion of model 3 in a completely still water body. The pressure-resistant still water chamber 1 provides a still water environment without a free liquid surface, eliminating background noise from pumps and impellers in the circulating water tunnel. The trough rail 11 restricts part of the movement of the model support frame 21 within the trough, significantly reducing the direct disturbance to the surrounding water body caused by the model support frame 21 moving model 3. Compared to a track with a raised structure directly set on the wall, the recessed design of the trough rail avoids local eddies caused by wall protrusions, weakens the impact on the flow field around model 3, and improves the accuracy of the fluid dynamics experiment.

[0057] The magnetic levitation stator unit 22 utilizes the permanent magnets of the float permanent magnet array 221 and the electromagnets of the excitation coil array 222. Through the electromagnetic-permanent magnet coupling between the two, the repulsive force generated by the repulsion of the like poles supports the model carrier frame 21 and the fixed model 3 on it, realizing contactless levitation between the model carrier frame 21 and the track, eliminating the friction noise of traditional mechanical guide rails. Furthermore, the horizontal component of the repulsive force generated by the inclined setting of the line connecting the north and south magnetic poles serves as the guiding force for lateral movement, achieving longitudinal constraint, reducing the disturbance caused by longitudinal movement of the model 3 during movement, and improving the accuracy of the fluid dynamics experiment.

[0058] In the prior art, two sets of electromagnetic-permanent magnet coupling structures are usually set on one side of the main float 212 in the longitudinal direction. One set of electromagnetic-permanent magnet coupling structures forms a vertical repulsive force for levitation, and the other set of electromagnetic-permanent magnet coupling structures forms a horizontal repulsive force to constrain the direction of movement. The two sets of electromagnetic-permanent magnet coupling structures on the same side are perpendicular to each other, which means that the main float 212 needs to be set with a right-angle structure on one side to set two sets of electromagnetic-permanent magnet coupling structures respectively. This makes the overall structure of the main float 212 relatively sharp due to the right-angle structure on both sides. In addition, the structure of the main float 212 is stacked at the edge, and the horizontal upper surface area is larger, thereby increasing the water-facing area of ​​the main float 212 when moving in the horizontal direction. Therefore, this application directly tilts the float permanent magnet array 221 to make the overall structure simpler. The two sides of the main float 212 do not need to be set with right angle structures, thereby reducing the water-facing area of ​​the model support frame 21 and making the shape smoother. This significantly reduces the disturbance to the water flow, thereby suppressing local flow around and vortex shedding, avoiding changes to the flow field characteristics around the model 3, and ensuring the accuracy of the fluid dynamics experiment of the model 3.

[0059] The electromagnetic propulsion unit 23 generates uniform thrust in a non-contact manner through the electromagnetic permanent magnet coupling between the traveling wave coil array 232 on the bulkhead and the permanent magnet array 231 of the mover. This avoids the periodic pressure disturbances caused by traditional mechanical transmission, ensuring that the model 3 moves smoothly in the tank and minimizing the disturbance to the water.

[0060] In summary, the overall design of this application not only completely eliminates mechanical friction noise, but also significantly optimizes the flow field environment of the test section, providing extremely low background noise and high-precision test conditions for the hydrodynamic and acoustic performance testing of underwater vehicles.

[0061] In some embodiments, the excitation coil arrays 222 are provided on both sides of the float permanent magnet array 221, so that the float permanent magnet array 221 is located between the two sets of excitation coil arrays 222. This structural design ensures that each float permanent magnet array 221 is "sandwiched" by the two sets of excitation coil arrays 222, and the float permanent magnet array 221 forms a repulsive force with the same magnetic poles on both sides, and the repulsive forces on both sides are in opposite directions; through the difference in the repulsive forces on both sides, the total force of the repulsive forces can be directed upward, ensuring that the repulsive forces can support the model support frame 21 and make it levitate on the track.

[0062] When the track is positioned at the top of the pressure-resistant still water tank 1, by setting the sump rail 11 to a T-shaped structure, the excitation coil array 222 can be placed below the float permanent magnet array 221, generating an upward repulsive force between them to support the model support frame 21 in suspension on the track. This upward levitation force also prevents the main float 212 from detaching from the track. When the track is positioned at the bottom of the pressure-resistant still water tank 1, the excitation coil array 222 is placed on the bottom wall of the pressure-resistant still water tank 1, placing it below the float permanent magnet array 221. This generates an upward repulsive force between them to support the model support frame 21 in suspension on the track. Furthermore, the gravity provided by the model support frame 21 and the connected model 3 prevents the main float 212 from detaching from the track. When the track is set on the side of the pressure-resistant still water tank 1, the main float 212 is set vertically. The upper and lower ends are supported and suspended by the repulsive force generated by electromagnetic permanent magnet coupling. When the float permanent magnet array 221 has a repulsive force on only one side, the end of the main float 212 has only a horizontal component of the repulsive force. If the direction of this horizontal component is inward, it will cause the main float 212 to detach from the track horizontally inward; if the direction of this horizontal component is outward, it will cause the main float 212 to contact the track horizontally outward. Therefore, the excitation coil array 222 is set on both sides of the float permanent magnet array 221 to generate repulsive force. The repulsive force on one side mainly bears the vertical suspension and lateral guiding force, while the repulsive force on the other side mainly forms a limit and prevents the model support frame from deviating from the track inward (towards the center of the pressure tank 1). Thus, the suspension and anti-detachment constraint of the model support frame 21 are completed simultaneously with the simplest "single permanent magnet + double coil" structure. This allows the track to be set not only at the top and bottom of the pressure tank 1, but also on the side of the pressure tank 1, improving the flexibility of the non-contact towing module 2. In addition, with the track set on the side, the constraint at the upper and lower ends of the main float 212 can improve its stability, so that the model support frame 21 can stably support the model 3 in a cantilever manner.

[0063] Furthermore, the trough rail is located at the bottom of the pressure still water tank. The model carrier moves forward laterally. When the model carrier moves forward, it deviates to the left. The repulsive force between one excitation coil array and its corresponding float permanent magnet array on one side of the model carrier increases, increasing the horizontal component of this repulsive force to the right. The repulsive force between the other excitation coil array and its corresponding float permanent magnet array on the other side of the model carrier remains unchanged or decreases, causing the resultant force of the horizontal components of the repulsive forces on both sides to the right, thus driving the model carrier back to the lateral movement path. When the model carrier moves forward and deviates to the right, the reverse process occurs. Ultimately, this guides the lateral movement of the model carrier. However, while the horizontal component of the repulsive force between the excitation coil array and the float permanent magnet array increases, the vertical component of the repulsive force (either upward or downward) also increases. If the float permanent magnet array only has an excitation coil array generating repulsive force on one side, it will cause a change in the unilateral levitation force of the model carrier, leading to inconsistent levitation forces on both sides of the model carrier. Ultimately, this can cause the model carrier to become unbalanced or even overturn during movement. Therefore, when the vertical component of the repulsive force on one side of the float permanent magnet array increases upward or downward, this application increases the vertical component of the repulsive force between the float permanent magnet array and the excitation coil array on the other side downward or upward accordingly. This achieves the superposition of the changes in the vertical components on both sides, which can cancel each other out, keeping the levitation force on one side of the model support frame unchanged, thereby ensuring that the levitation force on both sides of the model support frame is consistent and that the model support frame maintains left and right balance during movement.

[0064] In some embodiments, the excitation coil array 222 of the magnetic levitation stator unit 22 is composed of a plurality of coil elements (i.e., electromagnets) arranged continuously in the transverse direction, and each coil element presents the same polarity on the side facing the float permanent magnet array 221 after being energized, so as to form a levitation magnetic field with a constant direction; the float permanent magnet array 221 is composed of a plurality of permanent magnet elements (i.e., permanent magnets) arranged continuously in the transverse direction, and each permanent magnet element presents the same polarity on the side facing the excitation coil array 222, so as to maintain the same pole repulsion with the levitation magnetic field.

[0065] This structural design allows multiple permanent magnet elements in the magnetic levitation stator unit 22 to simultaneously face multiple coil elements, thereby generating multiple repulsive forces through the combination of multiple pairs of permanent magnet elements and coil elements. These forces jointly support the model carrier 21 and its load (model 3, float permanent magnet array), ensuring that the model carrier 21 is suspended on the track and increasing the load-bearing capacity of the non-contact towing module 2, enabling towing tests of models 3 of more sizes and weights. Secondly, the coil elements of the excitation coil array 222 typically extend laterally from one end of the pressure-resistant hydrostatic tank 1 to the other, ensuring that each permanent magnet element is always facing at least one coil element to generate a repulsive force as the model carrier 21 moves along the track, maintaining the model carrier 21's suspension relative to the track throughout its movement. In addition, the horizontally arranged pairs of permanent magnet elements and coil elements allow multiple repulsive forces to be fully distributed horizontally on the model support frame 21, providing more stable suspension support. This suppresses the forward and backward tilting of the model support frame 21 during its movement, keeps the axis of the model 3 aligned with its direction of movement, and ensures that the model 3 operates smoothly. This also prevents the slight tilting of the model 3 during its horizontal movement from causing a decrease in the accuracy of the test results.

[0066] In some embodiments, the permanent magnet array 231 of the electromagnetic propulsion unit 23 is composed of multiple permanent magnet elements (i.e., permanent magnets) arranged continuously in the transverse direction, and each permanent magnet element has an alternating N-pole and S-pole distribution on the side facing the traveling wave coil array 232. The traveling wave coil array 232 is composed of multiple coil elements (i.e., electromagnets) arranged continuously in the transverse direction, and each coil element, after being energized, forms a traveling wave magnetic field with alternating N-pole and S-pole on the side facing the permanent magnet array 231. Any one permanent magnet element is simultaneously opposite to two adjacent coil elements, so that the permanent magnet array 231 continuously obtains a non-contact driving force in the transverse direction under the push-pull action of the alternating polarity magnetic field.

[0067] This structural design allows a row of permanent magnet elements with alternating polarities of "NSNS..." to be arranged laterally, forming a "permanent magnet ruler" parallel to the track. The coil elements are also arranged continuously with alternating polarities of "NSNS..." and energized sequentially to generate a traveling wave magnetic field along the track. Since the spacing between the permanent magnet elements matches the pole pitch of the coil elements, each permanent magnet element is opposite to two adjacent coil elements. If the permanent magnet element facing the coil element is the S pole, then the N pole of one coil element is opposite to the S pole of one permanent magnet element, and the S pole of another coil element is opposite to the S pole of the same permanent magnet element. The adjacent permanent magnet element facing the coil element is the N pole, and the situation is reversed. Ultimately, each permanent magnet element is in a state of "like poles repel and unlike poles attract" combined force, generating a lateral forward thrust. The entire row of permanent magnet elements is synchronously propelled laterally forward, and the thrust obtained by the magnetic levitation stator unit 22 is multiplied.

[0068] In some embodiments, the main float 212 has inclined wing arms 211 at both ends in the longitudinal direction. The two inclined wing arms 211 are symmetrically arranged at both ends of the main float 212 and are inclined relative to the horizontal plane. The float permanent magnet arrays 221 are all fixed to the corresponding inclined wing arms 211 and perpendicular to the surface of the wing arms. That is, the line connecting the two stages of the float permanent magnet arrays 221 is perpendicular to the inclined wing arms 211, so that the float permanent magnet arrays 221 form an angle with the horizontal plane. This causes the repulsive force generated between the float permanent magnet arrays 221 and the excitation coil array 222 to be inclined to the horizontal plane, decomposing the repulsive force into vertical and horizontal components.

[0069] This structural design, by vertically mounting the float permanent magnet array 221 on the inclined wing arm 211, achieves the inclination of the two-stage connection line of the float permanent magnet array 221 to the horizontal plane. This decomposes the repulsive force of the magnetic levitation stator unit 22 into a vertical "floating" component and a horizontal "centering" component, while providing suspension and lateral constraints. No additional guide magnets or mechanical shoulders are required. Furthermore, the inclined wing arm 211 is symmetrically tilted relative to the main structure of the main float 212, making the main structure of the main float 212 smoother. This ensures a significant reduction in the water-facing area of ​​the model support frame 21 and the shedding of the wake vortex, resulting in a purer flow field in the model 3 region and further reduction in background noise in the test section.

[0070] In some embodiments, two longitudinally symmetrical guide cavities 111 are formed within the trough rail 11. The tilting wing arms 211 are suspended without contact within their respective guide cavities 111. The guide cavities 111 are arranged laterally, such that when the model support frame 21 moves laterally within the trough rail 11, the tilting wing arms 211 also move laterally within their respective guide cavities 111. The excitation coil arrays 222 are evenly distributed on both sides of the guide cavities 111, such that the float permanent magnet array 221 is positioned between the two sets of excitation coil arrays 222, creating a repulsive force on both sides of the float permanent magnet array 221.

[0071] This structural design allows the main float 212 to be fully inserted into the trough rail 11, while further inserting the inclined wing arms 211 at both ends of the main float 212 into the guide cavity 111. This results in the trough rail 11 having an approximately T-shaped cross-section, thereby reducing the width of the inner end slot of the trough rail 11 and reducing the exposed structure of the main float 212. Only the necessary parts of the main float 212 used to support and connect the model 3 are exposed in the slot of the trough rail 11. This increases the concealment of the trough rail 11 for the model support frame 21 and reduces the disturbance to the water in the pressure still water tank 1 when the model support frame 21 moves the model 3. In addition, the guide cavity 111 naturally provides installation positions for the excitation coil array 222 on both sides. By setting the two sets of excitation coil arrays 222 on both sides of the guide cavity 111, the float permanent magnet array 221 can be located between the two sets of excitation coil arrays 222, realizing the "single permanent magnet + double coil" suspension-limiting integrated structure, which simplifies the structure and reduces the water-facing area and flow resistance.

[0072] In some embodiments, the two side walls of the sump rail 11 gradually narrow from the opening to the bottom of the sump to form an inclined inner surface. More specifically, the inner surfaces of both sides of the sump rail 11 are inclined in the longitudinal direction so that the width of the internal space of the sump rail 11 gradually increases from the outside to the inside (i.e., along the direction close to the center of the pressure still water tank 1).

[0073] This structural design results in the slot opening of the sump rail 11 being an inwardly flared structure, with both sides of the sump rail 11 smoothly connecting to the inner wall of the adjacent pressure still water tank 1. This avoids local eddies caused by structural abrupt changes at the connection between the sump rail 11 and the inner wall of the adjacent pressure still water tank 1, significantly reducing water disturbance, further optimizing the flow field environment of the test section, ensuring the accuracy of the hydrodynamic and noise tests of the submersible, and improving the reliability of the experimental data.

[0074] In some embodiments, the float permanent magnet array 221 and the mover permanent magnet array 231 are both located inside the sinker rail 11, and the excitation coil array 222 and the traveling wave coil array 232 are both located outside the bulkhead of the pressure-resistant still water tank 1. Because the permanent magnet elements in the permanent magnet array need to move with the model support frame, and the model support frame 21 tows the model 3 within the pressure-resistant still water tank, the permanent magnet elements must be located inside the pressure-resistant still water tank. This structural design places the permanent magnet array on the portion of the model support frame 21 located within the track, reducing or even eliminating the exposure of the permanent magnet components in the water environment. This reduces the disturbance of the moving permanent magnet array to the water body during towing, ensuring uniform flow field and accurate noise testing in the submersible model 3 area. In addition, all coil components in the coil array are moved to the outer wall of the pressure-resistant still water tank, thus keeping the inner surface of the pressure-resistant still water tank intact and smooth without protrusions. This eliminates local eddies caused by uneven walls, and since all coil components are located outside the water environment, they will not be subject to accelerated corrosion due to immersion in water and energization. This also facilitates external repairs, improving equipment lifespan and maintenance convenience.

[0075] In some embodiments, the model support frame 21 further includes a longitudinal extension arm 213 and a model adapter 214. The longitudinal extension arm 213 is vertically disposed on the main float 212, such that one end of the longitudinal extension arm 213 is connected to the main float 212, and the other end extends away from the main float 212 (i.e., towards the center of the pressure-resistant still water tank 1). The model adapter 214 is disposed at the end of the longitudinal extension arm 213 away from the main float 212, and the model 3 is disposed on the model adapter 214, allowing the model 3 to move within the center of the pressure-resistant still water tank cavity. The main float 212, the longitudinal extension arm 213, and the model adapter 214 are all plate components, and all three are arranged laterally. The main float 212, the longitudinal extension arm 213, and the model adapter 214 in the model support frame 21 can be connected by conventional mechanical connection methods such as welding and bolts.

[0076] This structural design allows the main float 212, the longitudinal extension arm 213, and the model adapter 214 to adopt a plate structure and extend in the same direction. The longitudinal extension arm 213 is perpendicular to the main float 212 and the model adapter 214, ensuring a strong connection between the three parts. The model support frame 21 forms a high-rigidity, low-mass cantilever beam system, stably towing the model 3 for movement. In addition, the planes of the three plate parts of the model support frame 21 are aligned with the direction of movement, significantly reducing the water-facing area and wake vortex shedding, reducing towing drag and disturbance to the water body, while improving the system's acceleration and deceleration response speed, reducing energy consumption, and ensuring the accuracy of hydrodynamic and noise testing of the submersible.

[0077] In some embodiments, the electromagnetic propulsion unit further includes a streamlined shield 233. The streamlined shield 233 is typically disposed on the main float 212 and is arranged laterally. The mover permanent magnet array 231 is located inside the streamlined shield 233, and the streamlined shield 233 has smoothly transitioned drag-reducing sections at both ends in the lateral direction.

[0078] The sump rail 11 has a trough-shaped structure, and the trough opening of the sump rail 11 usually has a certain width in the longitudinal direction. The main float 212 is usually provided with inclined wing arms 211 at both ends in the longitudinal direction, and the inclined wing arms 211 are all hidden in the guide cavity 111. This makes the main part of the surface of the main float 212 exposed in the sump rail 11, and the mover permanent magnet array 231 can only be installed on this part of the main float 212. When the model support frame 21 moves, the mover permanent magnet array 231 moves with the main float 212 in the track, which will cause a large disturbance to the water. The structure of this application makes the flow guide cover completely enclose the mover permanent magnet array 231, and provides smooth drag-reducing ends at both ends, so that the shape of the permanent magnet element area is continuously streamlined, which significantly suppresses local flow around and vortex shedding; at the same time, it prevents ferromagnetic impurities in the closed water body from being adsorbed onto the surface of the permanent magnet, avoids additional noise sources and magnetic force attenuation, ensures long-term stability of electromagnetic drive efficiency, and further improves the flow field quality and test signal-to-noise ratio of the test section.

[0079] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0080] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A non-contact electromagnetic drive hydrodynamic noise test system, characterized in that, The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit.

2. The non-contact electromagnetic drive hydrodynamic noise test system according to claim 1, wherein, The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit.

3. The non-contact electromagnetic drive hydrodynamic noise test system of claim 1, wherein, The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit.

4. The non-contact electromagnetic drive hydrodynamic noise test system of claim 1, wherein, The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit.

5. The non-contact electromagnetic drive hydrodynamic noise test system of claim 1, wherein, The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit.

6. The non-contact electromagnetic drive hydrodynamic noise test system of claim 5, wherein, The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit.

7. The non-contact electromagnetic drive hydrodynamic noise test system of claim 1, wherein, The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. 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The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. The application relates to a non-contact towing module, a magnetic levitation stator unit and an electromagnetic propulsion unit. 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9. The non-contact electromagnetic drive hydrodynamic noise test system of claim 1, wherein, The model carrier further comprises a longitudinal extension arm and a model adapter; the longitudinal extension arm extends perpendicularly to the main floating seat and in the cabin direction, and the model adapter is arranged at the inner end of the longitudinal extension arm; the main floating seat, the longitudinal extension arm and the model adapter are all plate members extending in the transverse direction.

10. The non-contact electromagnetic drive hydrodynamic noise test system of claim 1, wherein, The electromagnetic propulsion unit is further provided with a streamlined shield; the streamlined shield covers the mover permanent magnet array in the transverse direction, and both ends of the streamlined shield are provided with smooth transition drag reduction sections.

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