An experimental device for measuring fluid-solid coupling and Hall effect field under variable overload in microgravity

Abstract

The present invention discloses a variable overload fluid-solid coupling and Hall effect field measurement experimental device under microgravity, comprising a microgravity drop tower for providing a microgravity environment, wherein a drop chamber is provided inside the drop chamber; a storage tank is fixed at the center position inside a force frame, the outer surface of the force frame is located on the same spherical surface, and the force acting on the force frame can be transmitted to the inside of the storage tank; a box is placed on the ground inside the drop chamber, an electromagnetic release mechanism is arranged on the top of the box, and the force frame is located inside the box; the electromagnetic release mechanism is used to fix the force frame and release the force frame during the experiment; a Hall induction circuit board is arranged on the side panels around the box, and permanent magnets are evenly spaced around the storage tank. The device has the condition of applying an external force to the storage tank. When the external force is successfully applied to the storage tank, the storage tank can move freely in a controllable space, and at the same time, the fluid-solid coupling characteristic law of the medium inside the storage tank is observed, and the motion posture and motion trajectory of the storage tank during the falling process are measured by the Hall effect method.

Description

Technical Field

[0001] The invention relates to the field of aerospace technology, and in particular to a variable-overload fluid-solid coupling and Hall effect field measurement experimental device under microgravity. Background Art

[0002] The spherical tank structure is a model structure that is often discussed in fluid mechanics research. The particularity of the model makes it often used in the aerospace field. Therefore, it is necessary to test the performance of the tank in a microgravity environment. The previous test method is to fix the measuring equipment on the optical platform. The system structure is lengthy and inflexible, which constrains the motion state of the spherical tank during free motion.

[0003] At the same time, in the existing technology, the microgravity drop tower is a ground-based microgravity experimental facility, which uses vacuum technology to evacuate the entire drop tower to achieve a microgravity test environment, and the test object is placed in the drop capsule, which is dropped from the top of the tower and performs free fall motion. The test object performs free fall motion with the drop capsule.

[0004] However, the existing devices are unable to achieve the free release of objects in the drop chamber. In particular, for experiments such as the mechanical analysis of the gas-liquid interface in space fluid experiments, there is a lack of effective experimental means to simulate the process control of the test object under short-term microgravity conditions.

[0005] At the same time, the motion trajectory of an object will be affected by external factors. Therefore, there is currently no good method to observe the motion trajectory of an object under the influence of external factors in a microgravity environment. Summary of the invention

[0006] The purpose of the present invention is to provide a variable overload fluid-solid coupling and Hall effect field measurement experimental device under microgravity, based on a microgravity drop tower to observe the control process of applying external force (overload) to a storage tank under micro / variable gravity conditions.

[0007] In order to solve the above technical problems, the present invention specifically provides the following technical solutions: an experimental device for variable overload fluid-solid coupling and Hall effect field measurement under microgravity, comprising:

[0008] A microgravity drop tower is used to provide a microgravity environment and has a drop cabin;

[0009] A force-bearing frame, the storage tank is fixed at the central position inside the force-bearing frame through a connecting assembly, the outer surface of the force-bearing frame is located on the same spherical surface, and the force acting on the force-bearing frame can be transmitted to the inside of the storage tank;

[0010] An electromagnetic release mechanism, a box is placed on the ground in the drop chamber, the electromagnetic release mechanism is arranged on the top of the box, and the force frame is located inside the box; the electromagnetic release mechanism is used to fix the force frame and release the force frame during the experiment, and a space is formed in the box for the force frame to move in a microgravity environment;

[0011] The side panels around the box body are provided with Hall induction circuit boards, and permanent magnets are distributed on the storage tank or the force-bearing frame.

[0012] Furthermore, the permanent magnet is arranged on the force-bearing frame; there are a total of 6 installation positions for the permanent magnet, 4 of which are located on the horizontal plane, and the other two are arranged on the upper and lower sides of the horizontal plane, and the line connecting the two is perpendicular to the horizontal plane; the installation positions of two adjacent permanent magnets are perpendicular to each other in space.

[0013] Furthermore, a first data acquisition module is provided on the box body, and the first data acquisition module collects motion data after the force-bearing frame is released.

[0014] Furthermore, a second data acquisition module is provided inside the force-bearing frame, and when the force-bearing frame is in free motion, the data acquisition module is used to monitor and acquire motion data of the fluid medium in the storage tank;

[0015] The battery module is arranged on the inner side of the stress-bearing frame and is used to supply power to the second data acquisition module.

[0016] Furthermore, the electromagnetic release mechanism can apply a preset thrust when releasing the force-bearing frame.

[0017] Furthermore, the bottom plate of the box body is a foam shock-absorbing plate.

[0018] Furthermore, the force-bearing frame includes at least three circular rings that are cross-fixedly connected to each other;

[0019] One of the rings is a fixed ring, and the other rings are supporting rings;

[0020] The supporting circular rings are arranged perpendicular to the diameter of the fixing circular ring, and the supporting circular rings are arranged at equal intervals from each other.

[0021] Further, the connection assembly includes a mounting plate, a first flange and a second flange;

[0022] The mounting plate is a ring-shaped structure, and its edge is fixed on the inner side of the fixing ring;

[0023] The first flange is arranged on the mounting plate, the second flange is arranged on the first flange, and the second flange and the storage tank are integrally formed.

[0024] Furthermore, the first flange and the second flange are located below the center plane of the storage tank.

[0025] Further, the second data acquisition module includes an image capture device and / or a pressure sensor;

[0026] The image capture device is fixed on the inner side of the stress frame, with the lens facing the storage tank;

[0027] The pressure sensor is fixed inside the storage tank, and its lead wire is located outside the storage tank, and the connection between the two is sealed.

[0028] Furthermore, it also includes a lighting assembly, which is arranged on the inner side of any supporting ring.

[0029] Compared with the prior art, the present invention has the following beneficial effects: the device is based on a microgravity drop tower to realize the control process of applying external force (overload) to the storage tank under micro / variable gravity conditions; when the external force is successfully applied to the storage tank, the storage tank can move freely in a controllable space, and at the same time, the fluid-solid coupling characteristics of the medium inside the storage tank are observed, and the movement posture and movement trajectory of the storage tank during the falling process are measured by the Hall effect method. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0031] Figure 1 This is a schematic diagram of the structure of this application;

[0032] Figure 2 It is a structural schematic diagram of the load-bearing frame in this application;

[0033] Figure 3 It is a structural schematic diagram of the bottom of the load-bearing frame in this application;

[0034] Figure 4 It is a cross-sectional view of the load-bearing frame in this application;

[0035] Figure 5 This is a schematic diagram of the structure in which the force-bearing frame is built into the box in this application;

[0036] Figure 6 It is a schematic diagram of the relationship between the magnetic flux density of a permanent magnet in space and the size of the permanent magnet itself;

[0037] Figure 7 This is a schematic diagram of the relationship between XYZ three-axis data and distance of φ12*H10 samarium cobalt magnetic material;

[0038] Figure 8 This is a schematic diagram of the relationship between XYZ three-axis data and distance of φ12*H20 samarium cobalt magnetic material;

[0039] Fig. 9 is a schematic diagram of the distribution of installation positions of permanent magnets on the force-bearing frame;

[0040] Fig.10 One of the schematic diagrams of the distribution of permanent magnets on the force-bearing frame;

[0041] Fig.11 Another schematic diagram of the distribution of permanent magnets on the load-bearing frame.

[0042] The numbers in the figure represent the following:

[0043] 1-microgravity drop tower, 2-force frame, 3-storage tank, 4-electromagnetic release mechanism, 5-first data acquisition module, 6-battery module, 7-box, 71-foam damping plate, 72-base, 73-Hall induction circuit board, 74-permanent magnet, 75-installation position of permanent magnet;

[0044] 21 -connecting assembly, 22 -fixing ring, 23 -supporting ring, 24 -mounting plate, 25 -first flange, 26 -second flange, 27 -image capturing device, 28 -pressure sensor, 29 -illumination assembly. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] like Figure 1 As shown, the present invention provides a variable overload fluid-solid coupling and Hall effect field measurement experimental device under microgravity, comprising the following structures: a microgravity drop tower 1 for providing a microgravity environment, wherein the microgravity drop tower 1 has a drop chamber 11; a storage tank 3 is fixed at a central position inside a force frame 2 through a connecting assembly 21, the outer surface of the force frame 2 is located on the same spherical surface, and the force acting on the force frame 2 can be transmitted to the inside of the storage tank 3; a box 7 is placed on the ground inside the drop chamber 11, an electromagnetic release mechanism 4 is arranged on the top of the box 7, and the force frame 2 is located inside the box 7; the electromagnetic release mechanism 4 is used to fix the force frame 2 and release the force frame 2 during the experiment, and a space is formed inside the box 7 for the force frame 2 to move in the microgravity environment.

[0047] Combination Figure 5 and Fig. 9 A Hall sensor circuit board 73 is provided on the side panels around the box body 7, and permanent magnets 74 are distributed on the storage tank 3 or the force-bearing frame 2; in the present application, the permanent magnet 74 is arranged on the inner side of the force-bearing frame 2, and a total of 6 permanent magnet installation positions 75 are arranged, 4 of which are located on the horizontal plane, and the other two are arranged on the upper and lower sides of the horizontal plane, and the connection line between the two is perpendicular to the horizontal plane; the installation positions 75 of two adjacent permanent magnets are perpendicular to each other in space.

[0048] At least one permanent magnet is placed, and up to six permanent magnets can be placed. They can be placed in different positions according to test requirements. Normally, the number of permanent magnets installed is Fig.10 and Fig.11 Two ways.

[0049] The magnetic field formed by the permanent magnet and the Hall sensor circuit board is coupled, and the measured three-dimensional vector data is edited and compressed to form a data packet. The position coordinates of the magnetic target in the coordinate system are calculated through algorithm solution and inversion. Finally, the position change of the tank during the falling process of the drop tower is calculated and the position change is visualized.

[0050] When the drop tank is falling, the electromagnetic release unit applies a DC voltage, and the tank will be released according to the pre-set thrust. The tank falls under micro / variable gravity and the intervention of a certain thrust. Finally, the release process of the tank freely or with the application of external force in the micro / variable gravity environment is realized, and then the motion characteristics of the tank during the shaking process are studied.

[0051] The present application sets an electromagnetic release mechanism in the drop cabin to form an independent release unit, so that at any time point in the drop cabin, the electromagnetic release mechanism is used to release the force frame, and the storage tank inside the force frame is released in a free fall state in a microgravity environment. The mechanical analysis of the liquid level in the storage tank under a similar environment is studied. In this embodiment, the secondary release of the force frame in a free fall state in a microgravity environment is completed in the box, which is convenient for observation and avoids the force frame from causing a collision with the inside of the drop cabin after the secondary release and landing.

[0052] The motion posture and trajectory of the tank are measured by the Hall effect method. The electromagnetic effect method is a method of measuring the magnetic field by using the current flowing through the metal or semiconductor and the electromagnetic effect generated by the external magnetic field.

[0053] The Hall voltage generated by the Hall effect can generally be expressed as:

[0054]

[0055] Among them, I is the current flowing through the conductor, B is the magnetic field applied to the conductor, RH is the Hall coefficient of the conductor material, and d is the thickness of the conductor in the direction of the magnetic field. In addition to conductors, semiconductors can also produce the Hall effect, and the Hall effect of semiconductors is stronger than that of conductors.

[0056] The Hall effect method can measure 10 -7 The measurement error is 10 -3 ~10 -2 ; It can also measure alternating magnetic fields with a frequency of up to 10-100MHz and a magnetic induction intensity of 5T, as well as pulsed magnetic fields with a pulse duration of tens of microseconds; this method has significant advantages in measuring magnetic fields in small gap spaces. It is suitable for the experimental environment based on the experimental device described in this application.

[0057] In the variable overload experimental device, permanent magnets are distributed as required, and electromagnetic induction circuit boards are installed on the side panels around the box to complete the construction of the electromagnetic induction environment. The size of the permanent magnet is related to the magnetic flux density of the measuring point. The relationship between the magnetic flux density of the permanent magnet in space and the size of the permanent magnet itself satisfies the following formula for cylindrical permanent magnets:

[0058]

[0059] like Figure 6 As shown, B(X) is the magnetic field strength at the calculated position, Br is the residual magnetic density of the permanent magnet, R is the magnet radius, L is the magnet height, and X is the distance between the calculated point and the surface of the permanent magnet.

[0060] like Figure 7 As shown, the three-axis magnetic flux density data of sensors at measuring points 2, 3, and 4 at different spacings for φ12*H10 samarium cobalt magnetic material.

[0061] like Figure 8 As shown, the three-axis magnetic flux density data of sensors at measuring points 2, 3, and 4 at different spacings for φ12*H20 samarium cobalt magnetic material.

[0062] Based on the above data measurement and analysis, this embodiment selects φ12mm, 20mm high samarium cobalt magnetic material as the magnetic target.

[0063] The device also includes the following structure: a first data acquisition module 5 arranged on the box body 7, the first data acquisition module 5 acquires the motion data of the force frame 2 after being released; a second data acquisition module arranged inside the force frame 2, when the force frame 2 is in free motion, the second data acquisition module is used to monitor and obtain the motion data of the fluid medium in the storage tank 3; a battery module 6, arranged on the inner side of the force frame 2, for supplying power to the second data acquisition module.

[0064] The first data acquisition module 5 is mainly an image acquisition unit, which is connected by the image interface provided by the drop cabin to realize real-time monitoring of the movement of the force-bearing frame. It can be set on the top of the box body or on the side panel of the box body.

[0065] The force frame wraps the storage tank to protect it from damage. At the same time, its spherical structure ensures that during free movement, regardless of rolling, collision or impact, the spherical force frame will transfer the force process to the storage tank.

[0066] The second data acquisition module collects various data of the storage tank in a free motion state. The data acquisition module together with the battery module are arranged in the spherical force frame, so that the whole device is independent and does not require external cables, and does not affect the free movement of the whole force frame.

[0067] This device is mainly used for testing the spherical tank in a free motion state in a microgravity environment. In a microgravity environment, objects are not affected by gravity, so the setting of the data acquisition module and the battery module will not change the motion state of the spherical tank in free motion.

[0068] The present application also provides another embodiment, where the electromagnetic release mechanism 4 can apply a preset thrust when releasing the force frame 2. The electromagnetic release mechanism is arranged on the top of the box, and applies a vertical downward thrust to the target object. Combined with specific experiments, forces at various angles can also be applied to the object.

[0069] In this application, the electromagnetic release mechanism is preferably an electric lock of model XG-07C produced by Sairui. Since the drop cabin can provide a 12V control signal, the use environment of the electric lock is 12V DC voltage. The target object is connected to a hook, and the hook is stuck in the lock head assembly of the electric lock. When the electric lock is powered on, it is unlocked instantly to complete the release of the target object. This series of electric locks has thrust and non-thrust, which are selected according to the test requirements, and thrust is applied to the object while releasing it.

[0070] like Figure 5 As shown, the present application also provides an implementation scheme for the box body, in which the bottom plate of the box body 7 is a foam shock-absorbing plate 71, which plays a shock-absorbing role when the objects in the box body fall to the ground, thereby avoiding damage to the objects.

[0071] With respect to the box body, the present application also provides an implementation mode, in which the box body 7 is a rectangular frame structure, and the side panels on all sides play a protective role to prevent objects from colliding with the interior of the drop cabin.

[0072] With respect to the box, the present application also provides an implementation mode, in which the box 7 is provided with a background light source on the inner side of the side panel for observing the movement of the object to be measured inside the box.

[0073] With respect to the box, the present application also provides an implementation mode, in which a base 72 is provided at the bottom of the box 7, and the projection surface of the base is larger than the projection surface of the box 7. The base can ensure the stability of the box, and the foam shock-absorbing plate is fixed on the base. The box is like a cover stuck on the base. When putting in or taking out the test object, it is only necessary to complete the disassembly and assembly between the base and the box.

[0074] like Figure 2 As shown, the present application provides a specific implementation of a force frame, the force frame 2 includes at least three circular rings that are cross-fixed and connected to each other; one of the circular rings is a fixed circular ring 22, and the other circular rings are supporting circular rings 23; the supporting circular rings 23 are arranged perpendicular to the diameter position of the fixed circular ring 22, and the supporting circular rings 23 are arranged at equal intervals from each other, which can form the simplest spherical force frame; we can increase the number of supporting circular rings according to actual needs, and the circular rings are detachable structures for convenient and quick assembly, and can be replaced if the circular rings are damaged.

[0075] The storage tank 3 is fixed in the stress frame 2 through the connecting assembly 21. Figure 4 The present application provides a specific implementation of the connection component, the connection component 21 includes a mounting plate 24, a first flange 25 and a second flange 26; the mounting plate 24 is a ring-shaped structure, and its edge is fixed on the inner side of the fixed ring 22; the first flange 25 is arranged on the mounting plate 24, and the second flange 26 is arranged on the first flange 25, and the second flange 25 and the storage tank 3 are integrally formed; wherein the size of the mounting plate is fixed, and we can select a flange of corresponding size according to the size of the storage tank, so that storage tanks of different diameters can be installed on the mounting plate.

[0076] This application provides a specific implementation of the data acquisition module. This experiment mainly observes the interface morphology of the liquid in the storage tank and the change of the pressure at the bottom of the storage tank over time; combined with Figure 2 and Figure 4 , wherein the second data acquisition module includes an image capture device 27 and / or a pressure sensor 28; the image capture device 27 is a motion camera, which is fixed on the inner side of the force frame 2, with the lens facing the storage tank 3; the first flange 25 and the second flange 26 are located below the center plane of the storage tank 3, so that the motion camera can observe the movement of the liquid in the tank. The pressure sensor 28 is fixed inside the storage tank 3, and its lead wire is located outside the storage tank 3. The connection between the two is sealed. A data storage device is also provided on the mounting plate, which is connected to the sensor for communication, and the pressure data is stored in the data storage device. After the experiment is over, the data in the data storage device is read.

[0077] A lighting assembly 29 is also provided inside the stress frame 2. The lighting assembly 33 is an LED light strip, which is arranged on the inner side of any supporting ring 23 for illuminating the storage tank. The battery module 6 also supplies power to the lighting assembly.

[0078] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. An experimental device for variable overload fluid-solid coupling and Hall effect field measurement under microgravity, characterized in that: include: A microgravity drop tower (1), used for providing a microgravity environment, having a drop cabin (11); A force-bearing frame (2) and a storage tank (3) are used as experimental objects, which are fixed at a central position inside the force-bearing frame (2) via a connecting assembly (21); the outer surface of the force-bearing frame (2) is located on the same spherical surface, and the force acting on the force-bearing frame (2) can be transmitted to the inside of the storage tank (3); An electromagnetic release mechanism (4), a box (7) is placed on the ground inside the drop cabin (11), the electromagnetic release mechanism (4) is arranged on the top of the box (7), and the force-bearing frame (2) is located inside the box (7); The electromagnetic release mechanism (4) is used to fix the force-bearing frame (2) and release the force-bearing frame (2) during an experiment; a space is formed in the box (7) for the force-bearing frame (2) to move in a microgravity environment; A Hall sensor circuit board (73) is provided on the side panels around the box (7); permanent magnets (74) are distributed on the force-bearing frame (2); the permanent magnets (74) are arranged on the force-bearing frame (2); a total of six permanent magnet installation positions (75) are provided, four of which are located on the horizontal plane, and the other two are arranged on the upper and lower sides of the horizontal plane, and the line connecting the two is perpendicular to the horizontal plane; the installation positions (75) of two adjacent permanent magnets are perpendicular to each other in space; The force-bearing frame (2) comprises at least three circular rings that are cross-fixedly connected to each other; One of the circular rings is a fixed circular ring (22), and the other circular rings are supporting circular rings (23); The supporting circular rings (23) are arranged perpendicular to the diameter of the fixing circular ring (22), and the supporting circular rings (23) are arranged at equal intervals from each other.

2. The experimental device for variable overload fluid-solid coupling and Hall effect field measurement under microgravity according to claim 1 is characterized in that: The box body (7) is provided with a first data acquisition module (5), and the first data acquisition module (5) acquires movement data after the force-bearing frame (2) is released.

3. The experimental device for variable overload fluid-solid coupling and Hall effect field measurement under microgravity according to claim 1 is characterized in that: A second data acquisition module is provided inside the force-bearing frame (2), and when the force-bearing frame (2) is in free motion, the data acquisition module is used to monitor and acquire motion data of the fluid medium in the storage tank (3); A battery module (6) is also provided inside the stress-bearing frame (2) and is used to supply power to the second data acquisition module.

4. The experimental device for variable overload fluid-solid coupling and Hall effect field measurement under microgravity according to claim 1, characterized in that: The electromagnetic release mechanism (4) is capable of applying a preset thrust when releasing the force-bearing frame (2).

5. The experimental device for variable overload fluid-solid coupling and Hall effect field measurement under microgravity according to claim 1, characterized in that: The connection assembly (21) comprises a mounting plate (24), a first flange (25) and a second flange (26); The mounting plate (24) is a ring-shaped structure, and its edge is fixed on the inner side of the fixing ring (22); The first flange (25) is arranged on the mounting plate (24), the second flange (26) is arranged on the first flange (25), and the second flange (26) and the storage tank (3) are integrally formed.

6. The experimental device for variable overload fluid-solid coupling and Hall effect field measurement under microgravity according to claim 5, characterized in that: The first flange (25) and the second flange (26) are located below the center plane of the storage tank (3).

7. The experimental device for variable overload fluid-solid coupling and Hall effect field measurement under microgravity according to claim 3, characterized in that: The second data acquisition module comprises an image capture device (27) and / or a pressure sensor (28); The image capturing device (27) is fixed on the inner side of the stress-bearing frame (2), with the lens facing the storage tank (3); The pressure sensor (28) is fixed inside the storage tank (3), and its lead wire is located outside the storage tank (3), and the connection between the two is sealed.

8. The experimental device for variable overload fluid-solid coupling and Hall effect field measurement under microgravity according to claim 1, characterized in that: It also includes a lighting assembly (29), which is arranged on the inner side of any one of the supporting rings (23).

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