Floating method and device of wind tunnel magnetic suspension balance force measurement system

Abstract

The embodiment of the invention provides a floating method and device for a wind tunnel magnetic suspension balance force measurement system, and the method comprises the steps: 1, receiving a floating command after a flow field is established and the power-on operation of the system is initialized; 2, the system carries out demagnetization treatment before floating, preparation before floating closed-loop adjustment and control system parameter initialization, and after initialization is completed, the system controls the balance shell to start to move in a closed-loop mode and controls the balance shell to float to an initial preset position in a closed-loop mode; 3, the system controls the balance shell to move to a floating target position; 4, the system judges whether floating is successful or not, if yes, stable suspension bearing measurement is carried out, if not, system reset is carried out, and the steps 2-4 are repeated till stable suspension is achieved.

Description

Technical Field

[0001] This document relates to the field of wind tunnel testing and measurement technology, and in particular to a buoyancy method and device for a wind tunnel magnetic levitation balance force measurement system. Background Technology

[0002] Wind tunnel aerodynamic testing is used to measure the aerodynamic forces on aircraft models under different attitudes and wind tunnel flow field conditions. The wind tunnel balance is a key component used to accurately measure the aerodynamic forces acting on the model. Currently, aircraft development is moving towards cross-airspace, wide-speed-range, and high-maneuverability flight. Such aerodynamic configurations exhibit extreme aerodynamic load mismatches. For example, some hypersonic weapon models have aerodynamic configurations with extremely high longitudinal / lateral ratios, meaning the aerodynamic balance needs to simultaneously measure large longitudinal forces / moments and small lateral forces / moments. Therefore, to adapt to the development of advanced models, the wind tunnel balance must be capable of measuring extreme load mismatches.

[0003] Currently, most wind tunnel force measurement tests use strain gauges. Limited by their inherent measurement mechanisms, strain gauges cannot completely decouple their components structurally, resulting in a design contradiction between resolution (deformation) and stiffness. This makes it difficult to overcome the bottleneck of high-precision measurement of minute loads under extremely mismatched loads. The active magnetic levitation balanced force gauge is a novel type of wind tunnel balance. It uses active differential electromagnet technology to control the test model's levitation within the wind tunnel. When stably levitated, the aerodynamic forces acting on the model can be calibrated based on the electromagnetic parameters of the levitation system, changing the force transmission method and resolving the resolution-stiffness contradiction. Therefore, the magnetic levitation balanced force gauge allows for independent design of load-bearing components, and the load-bearing capacity and resolution are decoupled, enabling measurements under extremely mismatched loads and fundamentally solving the aforementioned bottleneck.

[0004] However, successful buoyancy and stable levitation are prerequisites for achieving load mismatch measurements using a wind tunnel magnetic levitation balance. This is especially true during model buoyancy, when the system exhibits strong nonlinearity and inter-component displacement coupling. Therefore, the buoyancy control strategy is a crucial part of the wind tunnel magnetic levitation balance control system design. The design load capacity of a magnetic levitation balance is positively correlated with its design stiffness. When there are significant differences in the design stiffness of the electromagnet assemblies between components, or significant differences in the design stiffness of differential electromagnets within the same component (for example, when the size of the electromagnetic components is limited, the load capacity can only be improved by designing differential electromagnet assemblies with large differences in stiffness), the influence of inter-component displacement coupling becomes more severe during buoyancy. This can lead to unsuccessful buoyancy or divergence in the model's displacement control system. Positional divergence and oscillation during the buoyancy process of the balance shell after the flow field is established can adversely affect the magnetic levitation balance itself and the model. The following problems also exist: After the current levitation measurement is completed, there will inevitably be some residual magnetism in the high-rigidity magnetic core. When the levitation is started again, even if the low-rigidity electromagnet on the opposite side is supplied with saturated current, it will be difficult to offset the residual magnetism of the high-rigidity electromagnet, which will also lead to the failure to levitate successfully.

[0005] In summary, there is an urgent need for a technical solution to address the shortcomings of current technology in addressing the issues encountered by the aforementioned wind tunnel magnetic levitation load mismatch measurement balance during the buoyancy process. Summary of the Invention

[0006] The purpose of this invention is to provide a buoyancy method and apparatus for a wind tunnel magnetic levitation balance force measurement system, aiming to solve the above-mentioned problems in the prior art.

[0007] This invention provides a buoyancy method for a wind tunnel magnetic levitation balance force measurement system, comprising: Step 1: After the flow field is established and the system is powered on and initialized, receive the buoyancy command; Step 2: The system performs demagnetization before buoyancy, prepares for buoyancy closed-loop adjustment, and initializes the system parameters. After initialization, the system uses closed-loop control to start the movement of the balance shell and uses closed-loop control to buoy the balance shell to the initial preset position. Step 3: The system controls the balance shell to move to the buoyancy target position; Step 4: The system determines whether the buoyancy is successful. If the determination is successful, a stable buoyancy load measurement is performed; otherwise, the system is reset, and steps 2-4 are repeated until stable buoyancy is achieved.

[0008] This invention provides a buoyancy device for a wind tunnel magnetic levitation balance force measurement system, comprising: The receiving module is used to receive the buoyancy command after the flow field is established and the system is powered on and initialized. The initialization module is used to perform demagnetization before buoyancy, prepare for buoyancy closed-loop adjustment, and initialize system parameters. After initialization, the system close-loop controls the balance shell to start moving and then controls the balance shell to float to the initial preset position. The buoyancy module is used to control the movement of the balance shell to the target buoyancy position via the system. The judgment module is used to determine whether the buoyancy is successful through the system. If the judgment is successful, a stable buoyancy load measurement is performed; otherwise, the system is reset, and the initialization module, the buoyancy module, and the judgment module are repeatedly called until stable buoyancy is achieved.

[0009] This invention also provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, it implements the steps of the above-described levitation method for the wind tunnel magnetic levitation balance force measurement system.

[0010] This invention also provides a computer-readable storage medium storing an information transmission implementation program, which, when executed by a processor, implements the steps of the above-described levitation method for the wind tunnel magnetic levitation balance force measurement system.

[0011] By employing the embodiments of the present invention, the problems of buoyancy failure or position oscillation that may occur during the buoyancy process when the design stiffness of the differential electromagnet group varies greatly between different components or the design stiffness of the differential electromagnet in the same component varies greatly are solved, thus avoiding the adverse effects of control instability on the test system during the buoyancy process of the balance shell after the flow field is established. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in one or more embodiments of this specification or in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a flowchart of the buoyancy method of the wind tunnel magnetic levitation balance force measurement system according to an embodiment of the present invention; Figure 2 This is a detailed flowchart of the buoyancy method of the wind tunnel magnetic levitation balance force measurement system according to an embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the working principle of the single-degree-of-freedom wind tunnel magnetic levitation balance force measurement test system according to an embodiment of the present invention; Figure 4This is a schematic diagram of the buoyancy device of the wind tunnel magnetic levitation balance force measurement system according to an embodiment of the present invention; Figure 5 This is a schematic diagram of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0014] To enable those skilled in the art to better understand the technical solutions in one or more embodiments of this specification, the technical solutions in one or more embodiments of this specification 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 this specification, and not all of the embodiments. Based on one or more embodiments of this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this document.

[0015] Method Implementation Examples According to embodiments of the present invention, a buoyancy method for a wind tunnel magnetic levitation balance is provided, particularly relating to a soft buoyancy method for a wind tunnel magnetic levitation balance suitable for measuring six-component load mismatch. Figure 1 This is a flowchart of the buoyancy method of the wind tunnel magnetic levitation balance force measurement system according to an embodiment of the present invention, as follows: Figure 1 As shown, the buoyancy method of the wind tunnel magnetic levitation balance force measurement system according to an embodiment of the present invention specifically includes: Step S101: After the flow field is established and the system is powered on and initialized, receive the buoyancy command; Step S102: The system performs demagnetization before buoyancy, prepares for buoyancy closed-loop adjustment, and initializes the control system parameters. After initialization, the system uses closed-loop control to start the movement of the balance shell and uses closed-loop control to buoy the balance shell to the initial preset position. Step S102 specifically includes: At the set time Inside, a sinusoidal alternating current with a fixed frequency and attenuating amplitude is passed through an electromagnet winding with residual magnetism. After a set time, the current in the electromagnet winding drops to zero. The electromagnet winding is an electromagnet winding in a differential electromagnet group with a stiffness greater than or equal to a predetermined value. The stiffness of the electromagnet winding is related to the measurement range.

[0016] For a six-component wind tunnel magnetic levitation force balance, the buoyancy PI controller parameter, i.e., the buoyancy proportional coefficient k, is controlled for each component. p1 and buoyancy integral coefficient k i1 Perform initialization; coarsely adjust the PD controller parameters, i.e., coarsely adjust the proportional coefficient k. p2 and coarse adjustment differential coefficient k d2 Fine-tuning the PID controller parameters means fine-tuning the proportional gain k of the PID controller. p3and fine-tuning integral coefficient k i3 and fine-tuning differential coefficient k d3 ; The three sets of parameters for each component are adjusted according to the differences in measurement requirements between the components, i.e., the design stiffness of the electromagnet for each component. Initialize the buoyancy target position Initial displacement error Preset position displacement control target value Set the initial displacement of the balance shell. and controller initial output For components with stiffness less than or equal to the threshold, Formula 1 is satisfied; for components with stiffness greater than the threshold, Formula 2 is satisfied. , Formula 1; Formula 2; Where k is the speed control coefficient, and its value range is... .

[0017] The system uses closed-loop control to start the balance housing from moving, and determines that the balance housing has started moving based on a first judgment condition, wherein the first judgment condition includes: within N consecutive control cycles The current displacement of the balance shell. Initial displacement of the balance shell The difference satisfies: .

[0018] The system uses closed-loop control to lift the balance shell to an initial preset position, and determines the initial preset position based on a second judgment condition, wherein the second judgment condition includes: M consecutive control cycles. Inside, preset displacement control target value Displacement relative to the current state of the balance shell real-time displacement error The absolute values ​​of all values ​​are less than or equal to the second predetermined value, wherein the real-time displacement error Satisfying the relation .

[0019] Step S103: The system controls the balance shell to move to the buoyancy target position; Step S104: The system determines whether buoyancy is successful. If successful, a stable buoyancy load measurement is performed; otherwise, the system is reset, and steps S102-S104 are repeated until stable buoyancy is achieved. Specifically, this includes: The system determines whether the buoyancy meets the third judgment condition. If it does, the buoyancy is determined to be complete. The third judgment condition includes: P consecutive control cycles. Inside, the target position for buoyancy Displacement relative to the current state of the balance shell real-time displacement error The absolute values ​​of all values ​​are less than or equal to a third predetermined value, and the real-time displacement error is... Satisfying the relation .

[0020] The system determines whether the buoyancy attempt meets the fourth condition. If it does, the buoyancy attempt fails. The fourth condition includes: L consecutive control cycles. Inside, the target position for buoyancy Displacement relative to the current state of the balance shell real-time displacement error The difference between the maximum and minimum values ​​is greater than or equal to a fourth predetermined value, and the real-time error is... Satisfying the relation .

[0021] The technical solutions of the embodiments of the present invention have the following beneficial effects: 1. The buoyancy method of the wind tunnel magnetic levitation balance force measurement system in this embodiment of the invention is applicable to wind tunnel magnetic levitation force measurement balances with six-component load mismatch, and can achieve smooth, impact-free, and high-success-rate soft buoyancy under extreme measurement load differences.

[0022] 2. In this embodiment of the invention, three control stages are set during the buoyancy process, and three sets of controller parameters are set accordingly. The parameters of each set are adjusted according to the stiffness of the electromagnet, i.e. the range. The phased control strategy can reduce the displacement coupling effect between components during the buoyancy process, thereby avoiding system oscillation.

[0023] 3. The embodiments of the present invention employ targeted demagnetization technology before buoyancy, applying an alternating current with a fixed frequency and attenuated amplitude only to electromagnets with high stiffness and significant residual magnetism to demagnetize them. This can eliminate residual magnetism in the magnetic core under extreme measurement load differences, thus solving the problem of buoyancy difficulties caused by residual magnetism.

[0024] 4. The embodiments of the present invention soften the initial control force by introducing an initial velocity coefficient, which is particularly suitable for large stiffness components, prevents excessive impact force from being output during buoyancy, and achieves smooth system start-up.

[0025] The technical solutions implemented according to the present invention will be described in detail below with reference to the accompanying drawings.

[0026] To illustrate the application scenarios of the method of the present invention, Figure 3A schematic diagram illustrating the working principle of a single-degree-of-freedom wind tunnel magnetic levitation balance force measurement test system is presented. The system includes a differential electromagnet assembly (for generating levitation force), a displacement sensor (for detecting the position of the balance shell), a power amplifier (for generating precise servo current to drive the electromagnets to generate electromagnetic force to control the position of the balance shell), the balance shell (for supporting the test model), and a controller (a digital signal processor and industrial computer, etc., for running closed-loop control algorithms such as PID). Specifically, a six-degree-of-freedom wind tunnel magnetic levitation balance force measurement test system includes six sets of the above-mentioned devices, realizing magnetic levitation force measurement of the model in six aerodynamic components.

[0027] The following embodiment of the invention uses a single degree of freedom as an example for explanation. The working principle is as follows: the controller detects the position of the balance shell in real time through a displacement sensor and outputs a control current command through a certain control algorithm. Upon receiving the control current command, the power amplifier generates a precise servo current to drive the electromagnet, producing electromagnetic force to control the position of the balance shell. Before buoyancy begins, the balance shell is in its initial position due to gravity or other factors. After successful buoyancy, the hull is located at the target position. The balance shell starts from its initial position. Hover to target position The process is called the buoyancy process. After successful buoyancy, the aerodynamic force, its own weight, and the electromagnetic force on the test model supported by the balance shell are in equilibrium, and the aerodynamic force can then be measured by its own weight and the electromagnetic force.

[0028] The specific processing steps of the buoyancy method of the wind tunnel magnetic levitation balance force measurement system in this embodiment of the invention are as follows: Figure 2 As shown. The basic process of this method is as follows: Before the system takes off, it first waits for the flow field to be established before powering on and waiting for the takeoff command; after receiving the takeoff command, the system enters the pre-takeoff demagnetization stage; after demagnetization is completed, it enters the three-stage takeoff control process, namely the pre-takeoff preparation stage, the coarse takeoff adjustment stage, and the fine takeoff adjustment stage. The stage transition and the determination of whether the takeoff is successful are triggered based on the continuous multi-cycle displacement error judgment mechanism. The specific implementation steps are as follows: Step 1, Preparations before buoyancy. After the wind tunnel flow field is established, the magnetic levitation balancing system is powered on. The system performs a self-test, and all sensors, amplifiers, and controllers are initialized and in standby mode, waiting for the host computer to issue the buoyancy command.

[0029] Step 2, Demagnetization before buoyancy. Upon receiving the buoyancy command, the system first enters the demagnetization stage. For the component in the six-component balance that requires high load-bearing capacity (such as the normal force component, where the design stiffness of the differential electromagnets differs significantly, and the residual magnetism on the side with higher stiffness is significant), a demagnetizing current is applied to the electromagnet winding on that side. This current is a sinusoidal alternating current with a fixed frequency (e.g., 50Hz) and an amplitude that decays exponentially with time, with a decay time constant set (e.g., 0.5 seconds). After the demagnetization time ends, the winding current decays to zero, effectively eliminating the residual magnetism of the core material and preventing it from interfering with the initial buoyancy. For components with small stiffness differences (such as the rolling torque component), the residual magnetism effect is negligible, so this step is skipped.

[0030] Step 3, Preparation stage before entering the buoyancy closed-loop regulation: Control system parameter initialization. This stage involves configuring the three-stage PID control parameters and other initial state variables for the core controller.

[0031] Set control objectives for three stages: The first-stage objective is to set the threshold for judging motion displacement difference to 10μm.

[0032] Second-stage objective: Coarsely adjust to the initial preset position. The threshold for judging the difference between the actual displacement and the actual displacement is set to 30μm.

[0033] Third-stage objective: Fine-tune to the final target buoyancy position. The threshold for judging the difference between the actual displacement and the actual displacement is set to 5μm.

[0034] Initialize three sets of PID parameters: Phase 1 (Startup) Parameters: Set the startup ratio coefficient (Take a larger value to quickly generate sufficient buoyancy), integral coefficient This stage employs PI control and avoids integral saturation.

[0035] Second stage (coarse adjustment) parameters: Set the coarse adjustment ratio coefficient (slightly smaller) Coarse adjustment of differential coefficients (Equivalent to increasing damping), coarsely adjust the integral coefficient. .

[0036] Third stage (fine-tuning) parameters: Set the fine-tuning ratio coefficient Fine-tuning the integral coefficients (Eliminate steady-state error), fine-tune the differential coefficients .

[0037] Initialize state variables: Read the initial displacement of the balance shell Set the target buoyancy position. and initial preset position target value (set up ).

[0038] Calculate the initial output of the controller : Calculate the initial displacement error For large stiffness components, a velocity control coefficient needs to be introduced. (This example takes) =0.5), using the formula Calculate the initial value of the integral to achieve a smooth start and prevent shock. For small stiffness components, use the formula... Special Note: Due to coupling between the six components, the three sets of PID parameters for each component (Fx, Fy, Fz, Mx, My, Mz) need to be independently adjusted and set according to their electromagnet stiffness, measurement range, and coupling relationship. For example, in normal control... The value is usually much larger than the setting value for roll control.

[0039] Step 4, the system begins the first stage of buoyancy: the closed-loop control of the balance shell begins to move. The controller starts outputting control signals using the PID parameters from the first stage. Displacement is detected once every control cycle (e.g., 0.1ms). When the system detects that the current displacement has increased within 5 consecutive control cycles... With initial displacement The absolute value of the difference |x - When the value reaches 10μm, it is determined that the balance shell has been successfully started and has begun to move, and the process immediately proceeds to the second stage.

[0040] Step 5: The system enters the second stage of coarse adjustment during buoyancy. The controller switches to the second set of PID parameters, aiming to quickly approach the initial preset position. The integral from the first stage is retained. Real-time error is calculated for each control cycle. When the system detects that the error has exceeded the target value within 10 consecutive control cycles... When the absolute values ​​of all values ​​are less than 30μm, the coarse adjustment is considered complete, and the process proceeds to the third stage.

[0041] Step 6: The system enters the third stage of fine-tuning for buoyancy. The controller switches to the third set of PID parameters, aiming to precisely stabilize at the final buoyancy target position. During this stage, the integrator begins to work to eliminate steady-state error and achieve high-precision positioning.

[0042] Step 7: Determine if the buoyancy has been completed.

[0043] Success condition: Calculate the real-time error relative to the final target in each control cycle. When the system detects that the error has exceeded the target value within 30 consecutive control cycles... When the absolute values ​​of all values ​​are less than 5 μm, the buoyancy is considered successful. The system exits the buoyancy process and enters the stable suspension load measurement stage, where it begins to formally collect aerodynamic load data.

[0044] Failure condition: If, during the buoyancy process, the system detects an error exceeding a certain threshold within 20 consecutive control cycles... If the difference between the maximum and minimum values ​​is greater than 40 μm, it indicates that the system is experiencing continuous oscillation or non-convergence, and the buoyancy attempt is deemed a failure. The controller will immediately cut off the electromagnet power output, perform a system reset, clear all state variables and reinitialize the parameters, and then automatically repeat the buoyancy process from step 2 until success or system shutdown.

[0045] It should be noted that the definitions of some relevant variables in the above processing steps can be found by referring to... Figure 3 As shown.

[0046] Device Example 1 According to an embodiment of the present invention, a buoyancy device for a wind tunnel magnetic levitation balance force measurement system is provided. Figure 4 This is a schematic diagram of the buoyancy device of the wind tunnel magnetic levitation balance force measurement system according to an embodiment of the present invention, as shown below. Figure 4 As shown, the buoyancy device of the wind tunnel magnetic levitation balance force measurement system according to an embodiment of the present invention specifically includes: The receiving module 40 is used to receive the buoyancy command after the flow field is established and the system is powered on and initialized. Initialization module 42 is used to perform demagnetization before buoyancy, prepare for buoyancy closed-loop adjustment, and initialize system parameters. After initialization, the system close-loop controls the balance shell to start moving and controls the balance shell to float to the initial preset position. The buoyancy module 44 is used to control the movement of the balance shell to the buoyancy target position through the system. The judgment module 46 is used to determine whether the buoyancy is successful through the system. If the judgment is successful, a stable buoyancy load measurement is performed; otherwise, the system is reset, and the initialization module, the buoyancy module, and the judgment module are repeatedly called until stable buoyancy is achieved.

[0047] The embodiments of the present invention are device embodiments corresponding to the above method embodiments. The specific operation of each module can be understood with reference to the description of the method embodiments, and will not be repeated here.

[0048] Device Example 2 This invention provides an electronic device, such as... Figure 5As shown, it includes: a memory 50, a processor 52, and a computer program stored in the memory 50 and executable on the processor 52, wherein the computer program, when executed by the processor 52, performs the steps as described in the method embodiment.

[0049] Device Example 3 This invention provides a computer-readable storage medium storing an information transmission implementation program, which, when executed by a processor 52, performs the steps described in the method embodiment.

[0050] The computer-readable storage media described in this embodiment include, but are not limited to, ROM, RAM, disk, or optical disk.

[0051] Finally, it should be noted that 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 the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A buoyancy method for a wind tunnel magnetic levitation balance force measurement system, characterized in that, include: Step 1: After the flow field is established and the system is powered on and initialized, receive the buoyancy command; Step 2: The system performs demagnetization before buoyancy, prepares for buoyancy closed-loop adjustment, and initializes the system parameters. After initialization, the system uses closed-loop control to start the movement of the balance shell and uses closed-loop control to buoy the balance shell to the initial preset position. Step 3: The system controls the balance shell to move to the buoyancy target position; Step 4: The system determines whether the buoyancy is successful. If the determination is successful, a stable buoyancy load measurement is performed; otherwise, the system is reset, and steps 2-4 are repeated until stable buoyancy is achieved.

2. The method according to claim 1, characterized in that, The demagnetization process performed by the system before buoyancy specifically includes: At the set time Inside, a sinusoidal alternating current with a fixed frequency and attenuating amplitude is passed through an electromagnet winding with residual magnetism. After a set time, the current in the electromagnet winding drops to zero. The electromagnet winding is an electromagnet winding in a differential electromagnet group with a stiffness greater than or equal to a predetermined value. The stiffness of the electromagnet winding is related to the measurement range.

3. The method according to claim 1, characterized in that, The initialization of the control system parameters specifically includes: For a six-component wind tunnel magnetic levitation force balance, the buoyancy PI controller parameter, i.e., the buoyancy proportional coefficient k, is controlled for each component. p1 and buoyancy integral coefficient k i1 Perform initialization; coarsely adjust the PD controller parameters, i.e., coarsely adjust the proportional coefficient k. p2 and coarse adjustment differential coefficient k d2 Fine-tuning the PID controller parameters means fine-tuning the proportional gain k of the PID controller. p3 and fine-tuning integral coefficient k i3 and fine-tuning differential coefficient k d3 ; The three sets of parameters for each component are adjusted according to the differences in measurement requirements between the components, i.e., the design stiffness of the electromagnet for each component. Initialize the buoyancy target position Initial displacement error Preset position displacement control target value Set the initial displacement of the balance shell. and controller initial output For components with stiffness less than or equal to the threshold, Formula 1 is satisfied; for components with stiffness greater than the threshold, Formula 2 is satisfied. , Official 1; Official 2; Where k is the speed control coefficient, and its value range is... .

4. The method according to claim 1, characterized in that, The closed-loop control of the system to start the balance housing movement specifically includes: The system uses closed-loop control to start the balance housing from moving, and determines that the balance housing has started moving based on a first judgment condition, wherein the first judgment condition includes: within N consecutive control cycles The current displacement of the balance shell. Initial displacement of the balance shell The difference satisfies: .

5. The method according to claim 1, characterized in that, The closed-loop control of the balance shell to float to the initial preset position specifically includes: The system uses closed-loop control to lift the balance shell to an initial preset position, and determines the initial preset position based on a second judgment condition, wherein the second judgment condition includes: M consecutive control cycles. Inside, preset displacement control target value Displacement relative to the current state of the balance shell real-time displacement error The absolute values ​​of all values ​​are less than or equal to the second predetermined value, wherein the real-time displacement error Satisfying the relation .

6. The method according to claim 1, characterized in that, The system determines whether the buoyancy is successful by including: The system determines whether the buoyancy meets the third judgment condition. If it does, the buoyancy is determined to be complete. The third judgment condition includes: P consecutive control cycles. Inside, the target position for buoyancy Displacement relative to the current state of the balance shell real-time displacement error The absolute values ​​of all values ​​are less than or equal to a third predetermined value, and the real-time displacement error is... Satisfying the relation .

7. The method according to claim 1, characterized in that, The system determines whether the buoyancy is successful by including: The system determines whether the buoyancy attempt meets the fourth condition. If it does, the buoyancy attempt fails. The fourth condition includes: L consecutive control cycles. Inside, the target position for buoyancy Displacement relative to the current state of the balance shell real-time displacement error The difference between the maximum and minimum values ​​is greater than or equal to a fourth predetermined value, and the real-time error is... Satisfying the relation .

8. A buoyancy device for a wind tunnel magnetic levitation balancing force measurement system, characterized in that, include: The receiving module is used to receive the buoyancy command after the flow field is established and the system is powered on and initialized. The initialization module is used to perform demagnetization before buoyancy, prepare for buoyancy closed-loop adjustment, and initialize system parameters. After initialization, the system close-loop controls the balance shell to start moving and then controls the balance shell to float to the initial preset position. The buoyancy module is used to control the movement of the balance shell to the target buoyancy position via the system. The judgment module is used to determine whether the buoyancy is successful through the system. If the judgment is successful, a stable buoyancy load measurement is performed; otherwise, the system is reset, and the initialization module, the buoyancy module, and the judgment module are repeatedly called until stable buoyancy is achieved.

9. An electronic device, characterized in that, include: The memory, the processor, and the computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of the levitation method of the wind tunnel magnetic levitation balance force measurement system as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores an information transmission implementation program, which, when executed by a processor, implements the steps of the levitation method of the wind tunnel magnetic levitation balance force measurement system as described in any one of claims 1 to 7.

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