Apparatus and method for simulating microgravity fluid on the ground using motion

Abstract

The application provides a device and method for simulating microgravity fluid on the ground by using motion method, and belongs to the field of ground microgravity simulation. The application comprises a microcomputer control system, a fluid carrier U-shaped pipe, a gas source power equipment and a sensor detection system. The pipe opening of the U-shaped pipe is upward and is fixed on the ground near by a support. The two ends of the pneumatic pipeline in the gas source power equipment are connected with the two vertical sections of the U-shaped pipe through rubber hoses. The sensor detection system is used for detecting and collecting the motion parameters of the liquid fluid in the U-shaped pipe. The sensor detection system is connected with the microcomputer control system, and the microcomputer control system is used for controlling the gas source power equipment. The application adopts the motion method to make the liquid fluid move in the U-shaped pipe in a set rule. The acceleration of the liquid fluid in the motion process is consistent with the gravity field by the microcomputer control system, so as to eliminate the gravity influence between the micro elements of the liquid fluid and achieve the weightlessness.

Description

Technical Field

[0001] This invention relates to the field of microgravity environment simulation technology, specifically to a device and method for simulating microgravity fluids on the ground using a motion method. Background Technology

[0002] Space fluid management under microgravity has always been a hot topic in fluid mechanics research. The microgravity environment largely eliminates sedimentation, buoyancy convection, and static pressure gradients, playing a crucial role in advancing fluid technology, materials science, and biotechnology. However, conducting space fluid research in real microgravity environments, such as those in drop towers, aircraft, rockets, and spacecraft, is not only limited by conditions but also very costly, making it difficult to achieve for many research projects and lacking universal applicability. Therefore, exploring how to simulate microgravity flow fields on Earth is a necessary and objective requirement.

[0003] Ground-based microgravity simulation methods can be broadly categorized into two types based on their principles: One type uses a motion method to simulate microgravity. This method involves moving an object according to specific rules, allowing almost all of the object's gravity to counteract inertial or centrifugal forces. In other words, gravity is used entirely to provide the acceleration required for the object's motion, thus eliminating the effects of gravity and achieving microgravity simulation. This falls under the category of environmental simulation. The other type uses a force balance method to simulate microgravity. This method primarily uses balancing forces to counteract the effects of gravity. Methods include using air support, neutral fluid buoyancy, ballast wires, static balance mechanisms, or constructed physical force fields to counteract gravity and simulate a microgravity environment. This falls under the category of environmental effect simulation.

[0004] Based on the special physical properties of fluids, ground-based simulation of microgravity fluids falls under the category of environmental simulation. However, the theories and methods for ground-based simulation of microgravity fluids are relatively scarce. Developing an experimental device for microgravity fluid simulation research is an unavoidable problem at present. Summary of the Invention

[0005] The present invention aims to address at least one of the technical needs problems existing in the prior art.

[0006] The technical solution of this invention is: a device for simulating microgravity fluid on the ground using a motion method, comprising a microcomputer control system, a liquid carrier U-tube, a gas source power equipment, and a sensor detection system.

[0007] The U-shaped tube has its opening facing upwards and is fixed near the ground by a bracket;

[0008] In the gas source power equipment, both ends of the pneumatic pipeline are connected to the vertical sections of the U-shaped tube via rubber hoses.

[0009] The pneumatic power source is used to drive the liquid fluid to move inside the U-shaped tube;

[0010] The sensor detection system is used for detecting the motion parameters of the liquid fluid collected in the U-shaped tube.

[0011] The sensor detection system is connected with a microcomputer control system, and the microcomputer control system is used for controlling the gas source power equipment.

[0012] The sensor detection system comprises four groups of photoelectric sensors used in pairs and located at the upper and lower ends of the vertical sections on both sides.

[0013] The microcomputer control system comprises an upper computer and a lower computer,

[0014] The upper computer is electrically connected with the lower computer through a data transmission line, and the lower computer is electrically connected with the gas source power equipment and the sensor detection system through the data transmission line.

[0015] The gas source power equipment adopts a peristaltic pump to provide pneumatic pressure for the motion of the liquid fluid.

[0016] The support comprises a base, a pair of T-shaped sliding blocks, a pair of vertical rods and four groups of clamping block groups.

[0017] The base is provided with T-shaped sliding block grooves, and the T-shaped sliding blocks are used for being slidably connected in the T-shaped sliding block grooves.

[0018] The pair of vertical rods are arranged in parallel, and the vertical rods are connected on the T-shaped sliding blocks in pairs, and two groups of clamping block groups are arranged on each vertical rod, and the two groups of clamping block groups on each vertical rod are used for clamping the upper and lower ends of the vertical sections in the U-shaped tube.

[0019] The clamping block group comprises a fixed clamping block and a movable clamping block, opposite surfaces of the fixed clamping block and the movable clamping block are respectively provided with V-shaped grooves, the vertical sections of the U-shaped tube are located in the opposite V-shaped grooves, and the fixed clamping block and the movable clamping block are connected through bolts.

[0020] Mounting holes for mounting photoelectric sensors are respectively arranged on the fixed clamping block and the movable clamping block.

[0021] The fixed clamping block is provided with a perforation for placing the vertical rod.

[0022] The vertical rod is connected to the T-shaped sliding block through threads.

[0023] The bottom of the vertical rod is provided with a nut, and the nut is located above the base.

[0024] The U-shaped tube is located between the pair of vertical rods or outside the pair of vertical rods.

[0025] A method for simulating microgravity fluid on the ground by using motion method, applied to a device for simulating microgravity fluid on the ground by using motion method,

[0026] The method comprises the following steps:

[0027] S1, in the initial state, the gas source power equipment drives the liquid fluid to be located at the upper part of the vertical section of one side of the U-shaped tube, which is marked as the initial falling height of the liquid fluid;

[0028] S2, when starting to act, the gas source power equipment acts to make the resultant force direction of the air pressure on the liquid fluid the same as the motion direction, and the liquid fluid accelerates to descend from the vertical section of one side to decelerate to ascend in the vertical section of the other side;

[0029] S3, during the action, the sensor detection system is used to detect the motion time of the liquid fluid in the U-shaped tube and upload the microcomputer control system to control the motion of the liquid fluid;

[0030] S4, when the liquid fluid decelerates to ascend to the marked height in the vertical section of the other side, the microcomputer control system controls the gas source power equipment to act to make the resultant force of the air pressure on the liquid fluid opposite to the motion direction before stopping, and then the process of descending-ascending is carried out; thus, the reciprocating motion of the driven liquid fluid in the U-shaped tube is completed.

[0031] In the working of the device, the output working parameters of the peristaltic pump are automatically controlled and adjusted by the microcomputer control system to drive the liquid fluid in the vertical U-shaped tube on the ground to move with the acceleration always downward in the two vertical sections, that is, the acceleration of one side is downward, and the acceleration of the other side is upward after passing through the curved section.

[0032] In the two vertical sections during the whole motion process, the acceleration direction of the liquid fluid is always consistent with the direction of the earth's gravitational field, that is, the acceleration direction is vertically downward. If the size of the acceleration is close to the earth's gravitational acceleration, that is, all or most of the gravity of the liquid fluid is used to provide the required acceleration for the motion of the liquid fluid at this time, the influence of the gravity between the liquid fluid micro-particles is eliminated, and the liquid fluid is in a weightless state, thereby providing a method and experimental device for simulating microgravity fluid on the ground by using the motion method. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is the system composition diagram of the present application;

[0034] Figure 2 It is the system principle block diagram of the present application;

[0035] Figure 3 It is the control principle block diagram of the present application;

[0036] Figure 4 It is the structure schematic diagram of the support in the present application;

[0037] Figure 5 It is the structure schematic diagram of the vertical rod and the T-shaped slider in the present application;

[0038] Figure 6 Structure diagram of the clamp block group in the present application;

[0039] Figure 7 Force analysis diagram of the liquid fluid in the present application;

[0040] Figure 8 Initial height state diagram of the present application,

[0041] Figure 9 Descending action diagram of the present application,

[0042] Figure 10 Pipe reversing action diagram of the present application,

[0043] Figure 11 Ascending action diagram of the present application,

[0044] Figure 12 Ascending to initial height diagram of the present application,

[0045] Figure 13 Descending action diagram of the present application;

[0046] Figure 14 Force analysis diagram of the fluid particle accelerated descending in the present application;

[0047] Figure 15 Force analysis diagram of the fluid particle decelerated ascending in the present application;

[0048] In the figure: 1 is a U-shaped pipe; 2 is a peristaltic pump; 3 is a microcomputer control system; 4 is a sensor detection system;

[0049] 5 is a bracket; 5-1 is a base; 5-1-0 is a T-shaped sliding block groove; 5-2 is a T-shaped sliding block; 5-3 is a vertical rod; 5-4 is a clamp block group; 5-4-1 is a fixed clamp block; 5-4-2 is a movable clamp block; 5-4-3 is a mounting hole; 5-4-4 is a perforation; 5-4-5 is a V-shaped groove; 5-5 is a nut; 5-6 is a washer;

[0050] 6 is a rubber hose; 7 is a joint; 8 is a fluid; 9 is a gas source; 10 is a pneumatic pipeline. DETAILED DESCRIPTION

[0051] The specific embodiments of the present application will be further described in detail below in combination with the drawings and specific embodiments. The following examples or drawings are used to illustrate the present application, but not to limit the scope of the present application.

[0052] Please refer to Figures 1-6 The device for simulating microgravity fluid by using motion method on the ground, comprising a microcomputer control system, a liquid carrier U-shaped pipe, a gas source power equipment and a sensor detection system,

[0053] The U-shaped opening of the U-shaped pipe is upwardly arranged and is arranged on the ground through a support;

[0054] Two ends of the pneumatic pipeline 10 in the gas source power equipment are connected with the two vertical sections of the U-shaped pipe through the rubber hoses 6 and the joints 7.

[0055] The sensor detection system is used for detecting the motion time of the fluid 8 in the U-shaped pipe.

[0056] The sensor detection system is connected with a microcomputer control system, and the microcomputer control system is used for controlling the gas source power equipment.

[0057] The principle of the application is that the pneumatic pressure generated by the peristaltic pump head extruding the rubber hose is used to drive the liquid fluid in the ground vertical U-shaped pipe to move in the gravitational field, the microcomputer control system cooperates with the sensor detection system to control the rotation direction and speed of the rotating shaft of the peristaltic pump, and the position and motion state of the liquid fluid are automatically adjusted and controlled to meet the requirements that the liquid fluid starts from static state at the top of one side vertical section of the U-shaped pipe, then moves downwardly at an accelerated speed, then enters the other side vertical section through the bottom curved section to move upwardly at a decelerated speed until reaching the top, and then the cycle is repeated.

[0058] In the two vertical sections in the whole motion process, the acceleration direction of the liquid fluid is always consistent with the direction of the earth's gravitational field, i.e. vertically downward. If the size of the acceleration is close to the earth's gravitational acceleration, i.e. the whole or most of the gravity of the liquid fluid is used to provide the required acceleration at this time, the influence of the gravity between the fluid elements is eliminated, the support force of the fluid elements is smaller than the gravity in the normal static state, and the fluid elements are in a weightless state.

[0059] The application specifically comprises: a U-shaped pipe 1, a peristaltic pump 2, a microcomputer control system 3, a sensor detection system 4, a support 5, a rubber hose 6 and a joint 7, the pneumatic pipeline and the rubber hose are connected through the joint 7.

[0060] For the liquid fluid carrier U-shaped pipe 1 in the application, the basic structure is two side vertical pipes and a 180° curved pipe, the center lines of the two vertical sections (i.e. vertical pipes) are tangent to the center lines of the two sides of the curved pipe respectively; in order to reduce the friction loss between the fluid and the pipe wall when the fluid moves in the U-shaped pipe 1 and to facilitate keeping the continuous and complete state, the inner wall surface of the pipe can be treated by a hydrophobic coating.

[0061] The gas source power equipment uses the peristaltic pump 2 to provide pneumatic pressure for the liquid fluid motion, but is not limited to the peristaltic pump, and other forms of structures of the gas source 9 can also be used to provide the equipment or can be used as the driving equipment of the liquid fluid.

[0062] The pneumatic pipeline adopts the rubber hose 6 or other material pipe fittings to build the pipeline, and the two ends of the pneumatic pipeline extruded by the peristaltic pump 2 are connected with the two side vertical sections of the U-shaped pipe 1 through the joints 7.

[0063] The microcomputer control system 3 comprises an upper computer and a lower computer, wherein the upper computer mainly comprises a liquid crystal display (i.e. a screen), a host computer, an input / output interface channel, a keyboard and a mouse; and the lower computer mainly comprises a PLC. The upper computer is electrically connected with the lower computer through a data transmission line. The lower computer is electrically connected with the controlled object, i.e. the peristaltic pump 2 and the sensor detection system 4 elements through the data transmission line.

[0064] The matching software comprises microcomputer system software, application software and a PLC process control algorithm. The main function is to control and adjust the peristaltic pump 2 in combination with the sensor detection system 4 to realize the optimal output parameter of the pneumatic pressure required by the pneumatic pipeline when the liquid fluid in the U-shaped tube 1 realizes the set motion rule.

[0065] The sensor detection system 4 comprises four pairs of optical sensors used in combination, which are respectively located at the upper and lower ends of the vertical section.

[0066] The optical sensors cooperate with each other to detect and collect the motion time and other state parameters of the liquid fluid in the U-shaped tube 1 and timely feedback to the microcomputer control system 3. According to the corresponding process control algorithm, the output parameter of the peristaltic pump 2 is continuously corrected and adjusted to meet the demand of the set motion rule.

[0067] It should be noted that the microcomputer control system 3 of the present application is composed of a microcontroller or an analog circuit, and the control strategy is the core of the unit. The system adjusts the working state of the peristaltic pump in combination with the sensor detection system 4 to meet the set motion rule of the liquid fluid.

[0068] In view of the setting of the control system and the composition of the circuit, it belongs to the relatively mature technical measures in the art. In addition, selective setting needs to be made according to the actual hardware physical parameters of different specifications, which will not be described herein.

[0069] The bracket 5 uses the clamping block group 5-4 to install and fasten the vertical section of the U-shaped tube 1.

[0070] The bracket 5 comprises a base 5-1, a T-shaped sliding block 5-2, a vertical rod 5-3, a clamping block 5-4, a bolt, a nut and a washer, but is not limited to such specific connection forms and mechanical components.

[0071] The base of the bracket 5 has a T-shaped sliding block groove 5-1-0, which is used in cooperation with the T-shaped sliding block 5-2. The T-shaped sliding block 5-2 can be adjusted in position in the base panel track according to the size of the U-shaped tube 1. The U-shaped tube 1 can be installed within the plane of the two vertical rods, or can be installed outside the plane of the two vertical rods.

[0072] The vertical rod 5-3 in the support 5 is connected to the T-shaped slider 5-2 by screwing, and after the T-shaped slider 5-2 is adjusted to the proper position according to the size of the U-shaped tube 1, the vertical rod is fastened to the base 5-1 by locking the nut 5-5 and the washer 5-6 at the bottom of the vertical rod.

[0073] The clamping block 5-4 in the support 5 is divided into a fixed clamping block 5-4-1 and a movable clamping block 5-4-2, and the inner sides of the opposite faces of the fixed clamping block 5-4-1 and the movable clamping block 5-4-2 are respectively provided with V-shaped grooves 5-4-5 to facilitate clamping the circular tube of the U-shaped tube 1.

[0074] The fixed clamping block and the movable clamping block in the support 5 are used not only for vertically fixing the U-shaped tube 1 on the vertical rod, but also have the function of installing sensor devices, which are used for the sensor devices required by the sensor detection system 4 for collecting the state parameters of the liquid fluid in the U-shaped tube 1.

[0075] The fixed clamping block and the movable clamping block are respectively provided with mounting holes 5-4-3 for installing photoelectric sensors, and the fixed clamping block is provided with a perforation 5-4-4 for placing the vertical rod, which is placed in the perforation and then locked by a bolt.

[0076] The present application uses the motion method to make the liquid fluid move in the U-shaped tube in a set rule, and ensures that the acceleration of the liquid fluid movement is consistent with the gravitational field during the movement process, so as to eliminate the gravitational influence between the liquid fluid elements and achieve the weightlessness state.

[0077] A method for simulating microgravity fluid on the ground by using the motion method,

[0078] The method comprises the following steps:

[0079] S1, in the initial state, the gas source power equipment drives the liquid fluid to be located at the upper part of the vertical section on one side of the U-shaped tube, which is marked as the initial falling height of the liquid fluid;

[0080] S2, when starting to act, the gas source power equipment acts to make the resultant force direction of the gas pressure on the liquid fluid the same as the motion direction, and the liquid fluid accelerates to descend from the vertical section on one side to the vertical section on the other side and then slows down to rise;

[0081] S3, during the action, the sensor detection system is used for detecting and collecting the motion parameters of the liquid fluid in the U-shaped tube, and uploading the motion parameters of the liquid fluid to the microcomputer control system for regulation and control;

[0082] S4, when the liquid fluid rises to the marked height on the other side vertical section deceleration, the microcomputer control system controls the air source power equipment to act, so that the liquid fluid is subjected to the air pressure resultant force and the motion before stopping is opposite, and then the process of descending-uprising is carried out; so reciprocating, the driving liquid fluid reciprocating motion in the U-shaped pipe is completed.

[0083] The liquid fluid motion process of the application is as follows: Figure 8 descending from the initial marked height of the left end, Figure 9 for the downward acceleration motion stage, Figure 10 for the bending pipe reversing, Figure 11 for the upward deceleration motion stage, Figure 12 reaching the same marked height as the left end at the right end; Figures 8-12 for a motion process; Figure 13 starting as a new starting point, and the above motion is reciprocated from the right end.

[0084] The arrows in the figure are the fluid flow direction, A is the initial marked height starting position, B is the lowest position of the downward motion vertical section, C is the lowest position of the upward motion vertical section, and D is the position of upward motion to the same position as the initial marked height;

[0085] The weightless section is AB section and CD section,

[0086] AB section is vertical downward acceleration motion, and CD section is vertical upward deceleration motion.

[0087] The following is the mechanical model analysis:

[0088] Based on the assumption of fluid continuum medium, the fluid column and fluid microelement particles are taken as the research objects in the vertical pipeline, and the liquid fluid moves as a whole under the action of pressure difference, that is, there is no viscous friction force between the liquid fluid microelement particles.

[0089] The force analysis of the liquid fluid is as shown in Figure 7 .

[0090] The symbol explanation is as follows:

[0091] l Length of liquid column;

[0092] p 1 Pressure on the upper surface of the liquid column;

[0093] p 2 Pressure on the lower surface of the liquid column;

[0094] f Motion resistance of the liquid column;

[0095] p Density of liquid;

[0096] α Acceleration of motion of liquid column;

[0097] g Acceleration of gravity;

[0098] A Cross-sectional area of pipe;

[0099] m Mass of micro-element particle;

[0100] M Mass of liquid column;

[0101] ∑F Total external force on liquid column;

[0102] ∑F m Total external force on micro-element particle;

[0103] F n Supporting force on micro-element particle;

[0104] (1) When the fluid column is accelerated vertically downward, the acceleration of the fluid is downward, according to Newton's second law:

[0105]

[0106] If the peristaltic pump is working, the pneumatic pressure provided by the pneumatic pipeline to both ends of the U-shaped tube acts on the fluid column as a total force equal to the motion resistance, that is, （p 1 -p 2 ) A = f , the liquid column is only subject to the acceleration of gravity, then we can get:

[0107] α = g

[0108] Because there is no relative motion between the fluid particles, they are in a state of relative equilibrium. The acceleration of the micro-element particle in the liquid column is also equal to g , the force analysis is as follows: Figure 14 We can get:

[0109] F n = mg - ∑F m = mg - ma = 0

[0110] (2) When the fluid column is accelerated vertically upward, the acceleration of the fluid is downward, according to Newton's second law:

[0111]

[0112] If the combined force of the pneumatic pressure provided by the pneumatic pipeline on the fluid microelement is equal to the movement resistance when the peristaltic pump is working, i.e. （p 1 -p 2 ) A = f Then, the following can be obtained:

[0113] α g

[0114] Because there is no relative movement between the fluid particles, the liquid column is in a state of relative equilibrium. The acceleration of the fluid microelement particles in the liquid column is equal to g The force analysis is as follows: Figure 15 The following can be obtained:

[0115] F n = mg - ∑F m = mg - ma = 0

[0116] Without considering the energy loss, the liquid column does free fall from the upper part of the vertical section of the U-shaped tube and returns to the same height position of the other vertical section due to inertia. However, because of the frictional resistance loss in the actual movement process, the pneumatic pressure needs to provide energy compensation. When the fluid column as a whole moves, only the frictional resistance between the liquid and the wall exists, so the peristaltic pump can provide power to offset the frictional resistance loss and keep the liquid column moving continuously as a whole.

[0117] As described above, when the liquid fluid accelerates downward and decelerates upward in the vertical section (i.e. Figure 7 ) of the U-shaped tube with a height of H, the acceleration is equal to the gravitational acceleration, the supporting force of the liquid fluid microelement is zero, i.e. there is no interaction between the fluid microelements, and the liquid fluid behaves as weightless.

[0118] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.​

Claims

1. A method for simulating microgravity fluid on the ground by using motion method, applied to a device for simulating microgravity fluid on the ground by using motion method, the device comprising a microcomputer control system, a liquid carrier U-shaped tube, a gas source power equipment and a sensor detection system, the U-shaped tube is fixed on the ground near by a support, with its tube opening upward; the gas source power equipment is connected with the U-shaped tube through rubber hoses at both ends of the gas pipeline, the gas source power equipment is used to drive the liquid fluid to move in the U-shaped tube, the sensor detection system is used to detect the motion parameters of the liquid fluid in the U-shaped tube, the sensor detection system is connected with the microcomputer control system, and the microcomputer control system is used to control the gas source power equipment, characterized in that the method comprises the following steps: S1, in the initial state, the gas source power equipment drives the liquid fluid to be located at the upper part of the vertical section on one side of the U-shaped tube, which is marked as the initial falling height of the liquid fluid; S2, when starting to act, the gas source power equipment acts to make the resultant force of the pressure difference on the liquid fluid be the same as the motion direction, and the liquid fluid accelerates to fall from the vertical section on one side to the vertical section on the other side and then decelerates to rise; S3, during the action, the sensor detection system is used to detect the motion time of the liquid fluid in the U-shaped tube and upload the microcomputer control system to control the motion of the liquid fluid; S4, when the liquid fluid decelerates to rise to the marked height on the vertical section on the other side, the microcomputer control system controls the gas source power equipment to act, so that the resultant force of the gas pressure on the liquid fluid is opposite to the motion direction before stopping, and then the process of falling and rising is repeated, thus completing the reciprocating motion of the liquid fluid in the U-shaped tube; when the acceleration is equal to the gravitational acceleration, the supporting force on the liquid fluid element is zero, and the liquid fluid appears to be weightless.

2. A method of simulating microgravity fluid on the ground using motion method according to claim 1, characterized in that: The sensor detection system comprises four pairs of photoelectric sensors, 3. A method for simulating microgravity fluid on the ground using motion method according to claim 1, characterized in that: The microcomputer control system comprises an upper computer and a lower computer, the upper computer and the lower computer are electrically connected through a data transmission line, and the lower computer is electrically connected with the gas source power equipment and the sensor detection system through the data transmission line.

4. A method for simulating microgravity fluid on the ground using motion method according to claim 1, characterized in that: The gas source power equipment uses a peristaltic pump to provide pneumatic pressure for the motion of the liquid fluid.

5. A method for simulating microgravity fluid on the ground using motion method according to claim 1, characterized in that: The support comprises a base, a pair of T-shaped sliding blocks, a pair of vertical rods and four groups of clamping blocks, the T-shaped sliding blocks are used for sliding connection in the T-shaped sliding block grooves, a pair of vertical rods are arranged in parallel, and each vertical rod is connected with a T-shaped sliding block, 6. A method of simulating microgravity fluid on the ground using motion according to claim 5, characterized in that: each vertical rod is provided with two groups of clamping blocks, and the two groups of clamping blocks on each vertical rod are used for clamping the upper and lower ends of the vertical section of the U-shaped tube.

7. A method of simulating microgravity fluid on the ground using motion according to claim 6, characterized in that: The clamping block group comprises a fixed clamping block and a movable clamping block, and the opposite surfaces of the fixed clamping block and the movable clamping block are respectively provided with V-shaped grooves, the vertical section of the U-shaped tube is located in the opposite V-shaped grooves, and the fixed clamping block and the movable clamping block are connected through bolts.

8. A method of simulating microgravity fluid on the ground using motion according to claim 5, characterized in that: The fixed clamping block and the movable clamping block are respectively provided with mounting holes for mounting photoelectric sensors, the fixed clamping block is provided with a perforation for placing the vertical rod. The vertical rod is connected with the T-shaped sliding block through threads, and the bottom of the vertical rod is provided with a nut located above the base.

9. A method of simulating microgravity fluid on the ground using motion according to claim 5, characterized in that: The U-shaped tube is located between a pair of uprights, or outside a pair of uprights. The U-shaped tube is located between a pair of uprights, or outside a pair of uprights.

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