A gas density automatic regulation method, system, device and medium for model experiment

Abstract

This invention relates to a method, system, device, and medium for automatic gas density control in model experiments, comprising: setting a target density value; acquiring the actual density value of the gaseous medium inside a sealed experimental container in real time; comparing the actual density value with the target density value and calculating the density deviation; generating an inflation or deflation operation command based on the density deviation; outputting the inflation or deflation operation command to an actuator to adjust the density of the gaseous medium inside the sealed experimental container through the inflation or deflation operation until the density deviation between the actual density value and the target density value inside the sealed experimental container is within a preset range. This invention can be widely applied in the field of model experiment technology.

Description

Technical Field

[0001] This invention belongs to the field of model experiment technology, specifically relating to a method, system, device and medium for automatic control of gas density in model experiments. It is particularly suitable for achieving precise and automatic adjustment of the density of gaseous medium in a closed container in scaled-down model experiments to meet experimental requirements under different gas-liquid density ratio conditions. Background Technology

[0002] In model experiments in fields such as shipbuilding and marine engineering, aerospace, and environmental simulation, it is often necessary to simulate specific gaseous environments, where the density of the gaseous medium is a crucial control parameter. For example, in liquid tank sloshing model experiments, the density ratio of the gaseous to the liquid medium is a significant factor affecting the sloshing impact pressure. Studies have shown that the traditional water-air combination cannot accurately reproduce actual operating conditions; therefore, it is necessary to adjust the density of the gaseous medium to meet experimental requirements. Similarly, in research areas such as combustion experiments and material environmental adaptability testing, precise control of the gas density within sealed containers is frequently required.

[0003] Currently, there are several related technologies involving gas density control or mixing. For example, Chinese patent CN111650972A discloses a "multi-component dynamic gas mixing test system with a mixer." This system uses a mass flow controller to prepare multi-component gases and employs a spherical mixing tank with a vacuum device to thoroughly mix gases with large density differences for scientific experiments. This technical solution focuses on the continuous preparation and mixing of multi-component gases, belonging to the field of "gas mixing." Its core lies in mixing different gases according to a preset ratio and then outputting the mixture, rather than real-time monitoring and active control of the density of the gas phase medium within an existing closed container.

[0004] Unlike the open-loop control method of the gas distribution system described above, the control of gas density in model experiments often requires stronger real-time performance and interactivity. During the experiment, the density of the gaseous medium in the sealed container will fluctuate due to factors such as temperature changes, gas leakage, or experimental operations, while the experiment requires the gas density to be stably maintained near the target value throughout the entire experiment. This necessitates that the control system can monitor the actual density inside the container in real time and automatically perform inflation or deflation operations based on the deviation between the measured value and the target value, forming a closed-loop feedback control.

[0005] To address the aforementioned needs, current technologies lack a gas density control device specifically designed for model experiment scenarios, possessing real-time density monitoring and closed-loop automatic adjustment capabilities. While existing gas mixing systems can prepare gases to the target density, they cannot dynamically adjust for density fluctuations within the container during experiments. Furthermore, gas density monitoring devices in industrial applications are primarily used for safety monitoring of power equipment, and their control logic and interface methods are difficult to adapt to the diverse experimental containers. Therefore, there is an urgent need in this field for a dedicated control system capable of real-time monitoring of gas density and automatic adjustment to meet experimental requirements. Summary of the Invention

[0006] To address the lack of existing control methods for model experiment scenarios that can monitor gas density in real time and perform closed-loop automatic regulation, the present invention aims to provide a method, system, device, and medium for automatic gas density regulation in model experiments. Through a complete set of feedback control logic, it achieves precise and automatic adjustment of the density of the gas phase medium in a closed experimental container, meeting the control requirements of the gas-liquid density ratio under different experimental conditions, and features high control accuracy, stable response, and wide applicability.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides an automatic gas density control method for model experiments, comprising: Set the target density value; Real-time acquisition of the actual density value of the gaseous medium inside a closed experimental container; The actual density value is compared with the target density value to calculate the density deviation. Generate inflation or deflation operation instructions based on density deviation; The inflation or deflation command is output to the actuator, and the density of the gaseous medium in the sealed experimental container is adjusted by the inflation or deflation operation until the density deviation between the actual density value and the target density value in the sealed experimental container is within the preset range.

[0008] Furthermore, the target density value is calculated and determined based on the gas-liquid density ratio and the density of the liquid phase medium required for the experiment.

[0009] Furthermore, the step of generating inflation or deflation operation commands based on density deviation includes: Determine if the absolute value of the density deviation is less than the preset dead zone threshold. If so, continue monitoring the actual density value of the sealed experimental container; otherwise, proceed to the next step. Generate corresponding density control instructions based on density deviation: When the actual density value is less than the target density value, an inflation command is generated to control the gas source to inject a preset high-density gas into the sealed experimental container. When the actual density value is greater than the target density value, an exhaust command is generated to control the exhaust valve to discharge gas from the sealed experimental container.

[0010] Furthermore, when generating inflation or deflation operation commands based on density deviation, a PID control algorithm is employed.

[0011] Furthermore, the PID control algorithm includes: Obtain the current density deviation e(t); Based on the current density deviation e(t), proportional, integral, and differential calculations are performed respectively to obtain the proportional term, integral term, and differential term; Summing the proportional, integral, and differential terms yields the total control quantity u(t) = P + I + D; Based on the magnitude of the control quantity u(t), the opening degree or opening and closing frequency of the gas source control valve or exhaust valve is dynamically adjusted, thereby controlling the rate of gas injection or discharge.

[0012] Furthermore, the method also includes a pressure interlock control step: During the inflation or deflation process, the gas pressure value inside the sealed experimental container is obtained in real time. The gas pressure value inside the sealed experimental container is compared with the preset upper pressure threshold and the preset lower pressure threshold. When the gas pressure exceeds the preset pressure upper limit threshold, an emergency venting command and / or a command to stop inflation are generated. When the gas pressure value is lower than the preset lower pressure threshold, a command to prohibit exhaust is generated.

[0013] Furthermore, the method also includes a turbulence interlocking control step: While executing the inflation or deflation command, a turbulence start command is generated to control the turbulence device set inside the sealed experimental container to turbulently mix the gas inside the sealed experimental container. Once the density deviation stabilizes within the preset range, a turbulence stop command is generated to shut down the turbulence device.

[0014] Secondly, the present invention provides an automatic gas density control system for model experiments, comprising: The target setting module is used to set the target density value; The data acquisition module is used to obtain the actual density value of the gaseous medium inside the sealed experimental container in real time. The comparison calculation module is used to compare the actual density value with the target density value and calculate the density deviation. The control decision module is used to generate inflation or deflation operation commands based on density deviation; The instruction execution module is used to output inflation or deflation operation instructions to the actuator to adjust the density of the gaseous medium in the sealed experimental container until the density deviation between the actual density value and the target density value in the sealed experimental container is within a preset range.

[0015] Thirdly, the present invention provides a computer-readable storage medium for storing one or more programs, said one or more programs including instructions that, when executed by a computing device, cause the computing device to perform any method.

[0016] Fourthly, the present invention provides a computing device comprising: one or more processors and a memory, wherein the memory stores one or more programs and is configured to be executed by the one or more processors, the one or more programs including instructions for performing any method.

[0017] The present invention has the following advantages due to the adoption of the above technical solutions: 1. This invention sets a target density value, obtains the actual density value of the gaseous medium in the sealed experimental container in real time, calculates the deviation from the target value, and generates inflation or deflation commands based on the deviation, forming a closed-loop feedback control until the density stabilizes within the preset range. This achieves precise and automatic adjustment of the density of the gaseous medium in the sealed experimental container, meets the control requirements of the gas-liquid density ratio under different experimental conditions, and has the characteristics of high control accuracy, stable response, and wide applicability.

[0018] 2. By setting up a pressure interlock control step, the present invention ensures that the pressure inside the sealed experimental container is maintained within the pressure threshold range, thereby effectively protecting the safety of experimental equipment and personnel.

[0019] 3. By setting up a turbulence interlock control step, the present invention can turbulently mix the gas in the experimental container while it is filling or venting, avoiding gas stratification caused by density differences, and making the density distribution of the gaseous medium in the sealed experimental container uniform.

[0020] This invention can be widely applied in the field of model experiment technology. Attached Figure Description

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. In the drawings: Figure 1 A flowchart of an automatic gas density control method for model experiments provided in an embodiment of the present invention; Figure 2A flowchart of the PID control algorithm provided in an embodiment of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] In some embodiments of the present invention, an automatic gas density control method for model experiments is provided. This method sets a target density value, acquires the actual density value of the gaseous medium inside a sealed experimental container in real time, calculates the deviation from the target value, and generates inflation or deflation commands based on the deviation, forming a closed-loop feedback control until the density stabilizes within a preset range. The present invention solves the problem of existing technologies being unable to monitor and dynamically maintain the gas density inside a sealed container in real time during model experiments. It has the advantages of high control precision, stable response, and safety and reliability, and is suitable for scaled-down model experiments in fields such as marine engineering, aerospace, and marine engineering.

[0025] Correspondingly, in other embodiments of the present invention, an automatic gas density control system, device, and medium for model experiments are provided.

[0026] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0027] Example 1 like Figure 1 As shown, this embodiment provides an automatic gas density control method for model experiments, including the following steps: Step S1: Set the target density value; Step S2: Obtain the actual density value of the gaseous medium inside the sealed experimental container in real time; Step S3: Compare the actual density value with the target density value and calculate the density deviation; Step S4: Generate inflation or deflation operation commands based on density deviation; Step S5: Output the inflation or deflation operation command to the actuator to adjust the density of the gaseous medium in the sealed experimental container through inflation or deflation operation. Step S6: Repeat steps S2 to S5 until the density deviation between the actual density value and the target density value in the sealed experimental container is within the preset range. Stop the inflation or deflation operation, maintain the current state, and complete the density control.

[0028] Furthermore, in step S1 above, the target density value is calculated and determined based on the required gas-liquid density ratio and the density of the liquid medium. For example, if the target gas-liquid density ratio is 0.004 and the density of the liquid medium (water) is 1000 kg / m³, then the target density value can be set to 4.0 kg / m³.

[0029] Furthermore, in step S2 above, the actual density value of the gaseous medium inside the sealed experimental container can be obtained in real time by a gas density monitor. Preferably, the gas density monitor can be a density sensor based on the principle of vibrating tube or thermal conductivity, with its probe extending into the sealed experimental container or connected to the sealed experimental container through a circulation pipeline to ensure accurate measurement.

[0030] Furthermore, step S4 above includes the following steps: Step S41: Determine whether the absolute value of the density deviation is less than the preset dead zone threshold (e.g., 0.05 kg / m³). If so, it means that the current density has met the experimental requirements. Then return to step S2 to continue monitoring and do not generate inflation or deflation commands to prevent frequent switching of control commands. Otherwise, proceed to step S42. Step S42: Generate corresponding density control instructions based on density deviation: When the actual density value is less than the target density value, an inflation command is generated to control the gas source to inject high-density gas (such as SF6) into the sealed experimental container. When the actual density value is greater than the target density value, an exhaust command is generated to control the exhaust valve to discharge gas from the sealed experimental container.

[0031] Furthermore, in step S42 above, when comparing the actual density value with the target density value and generating an inflation or deflation command based on the comparison result, a PID control algorithm is employed. Based on the proportional, integral, and derivative parameters of the density deviation, the control quantity is calculated, and the gas injection or deflation rate is dynamically adjusted to achieve smooth adjustment of the gas density.

[0032] like Figure 2 As shown, the specific flow of the PID control algorithm is as follows: Step S421: Input the current density deviation e(t), which is the difference between the actual density and the target density; Step S422: Perform proportional calculation and output the proportional term P=Kp×e(t), where Kp is the proportional coefficient, used to quickly respond to the current deviation; Step S423: Perform integral calculation and output the integral term I=Ki×∫e(t)dt, where Ki is the integral coefficient, which is used to eliminate steady-state error and make the density finally reach the target value accurately. Step S424: Perform differential calculation and output the differential term D=Kd×de(t) / dt, where Kd is the differential coefficient, used to predict the trend of deviation and suppress overshoot and oscillation; Step S425: Summate the proportional, integral, and derivative terms to obtain the total control quantity u(t) = P + I + D; Step S426: Based on the magnitude of the control quantity u(t), dynamically adjust the opening degree (if a proportional control valve is used) or opening and closing frequency (if an on / off valve is used) of the gas source control valve or exhaust valve to control the rate of gas injection or discharge.

[0033] Specifically, when the deviation is large, the control quantity u(t) is large, and the valve is fully open or opened and closed at high frequency; when the deviation gradually decreases, the control quantity u(t) decreases accordingly, the valve opening narrows or the opening and closing frequency decreases, so as to achieve a smooth approach of density.

[0034] Step S427: Return to the main control flow, obtain the new density deviation value, and perform the next round of PID calculation.

[0035] By using the PID control algorithm described above, this embodiment avoids the problems of frequent valve opening and closing and density oscillation in traditional on / off control methods, and achieves precise and stable regulation of gas density.

[0036] Furthermore, the above method also includes a pressure interlock control step: During inflation or deflation, the gas pressure value inside the sealed experimental container is obtained in real time through a pressure sensor; The gas pressure value inside the sealed experimental container is compared with the preset upper pressure threshold and the preset lower pressure threshold. When the gas pressure exceeds the preset pressure upper limit threshold, an emergency venting command and / or a prohibition on gas filling command are generated until the pressure returns to the normal range, thereby effectively ensuring the safety of experimental equipment and personnel. When the gas pressure value is lower than the preset lower pressure threshold, a command to prohibit exhaust is generated.

[0037] Furthermore, the above method also includes a turbulence interlocking control step: While executing the inflation or deflation command, a turbulence start command is generated to control the turbulence device set inside the sealed experimental container to turbulently mix the gas inside the sealed experimental container, so as to avoid gas stratification caused by density differences. Once the density deviation stabilizes within the preset range, a turbulence stop command is generated to shut down the turbulence device, ensuring a uniform density distribution of the gaseous medium inside the container.

[0038] Those skilled in the art should understand that the specific parameters described in the above embodiments (such as dead zone threshold, PID coefficient, pressure threshold, etc.) are merely illustrative and can be adjusted according to experimental requirements and equipment characteristics in actual applications. The method and control system described in this invention are not limited to a specific hardware structure and can be flexibly adapted to various sealed experimental containers, thus having wide applicability.

[0039] Example 2 The above-described embodiment 1 provides an automatic gas density control method for model experiments. Correspondingly, this embodiment provides an automatic gas density control system for model experiments. The system provided in this embodiment can implement the automatic gas density control method for model experiments of embodiment 1. The system can be implemented through software, hardware, or a combination of both. For example, the system may include integrated or separate functional modules or units to execute the corresponding steps in the methods of embodiment 1. Since the system in this embodiment is basically similar to the method embodiment, the description process in this embodiment is relatively simple. Relevant details can be found in the description of embodiment 1. The system embodiment provided in this embodiment is merely illustrative.

[0040] This embodiment provides an automatic gas density control system for model experiments, comprising: The target setting module is used to set the target density value; The data acquisition module is used to obtain the actual density value of the gaseous medium inside the sealed experimental container in real time. The comparison calculation module is used to compare the actual density value with the target density value and calculate the density deviation. The control decision module is used to generate inflation or deflation operation commands based on density deviation; The instruction execution module is used to output inflation or deflation operation instructions to the actuators (gas source control valve and exhaust valve) to adjust the density of the gaseous medium in the sealed experimental container until the density deviation between the actual density value and the target density value in the sealed experimental container is within the preset range, then the inflation or deflation operation is stopped, the current state is maintained, and the density regulation is completed.

[0041] Example 3 This embodiment provides a processing device corresponding to the automatic gas density control method for model experiments provided in Embodiment 1. The processing device can be a client-side processing device, such as a mobile phone, laptop, tablet computer, desktop computer, etc., to execute the method of Embodiment 1.

[0042] The processing device includes a processor, a memory, a communication interface, and a bus. The processor, memory, and communication interface are connected via the bus to enable communication between them. The memory stores a computer program that can run on the processor. When the processor runs the computer program, it executes the automatic gas density control method for model experiments provided in Embodiment 1.

[0043] Preferably, the memory may be high-speed random access memory (RAM), and may also include non-volatile memory, such as at least one disk storage device.

[0044] Preferably, the processor can be any type of general-purpose processor such as a central processing unit (CPU) or a digital signal processor (DSP), and there is no limitation herein.

[0045] Example 4 The automatic gas density control method for model experiments described in Embodiment 1 can be specifically implemented as a computer program product. The computer program product may include a computer-readable storage medium on which computer-readable program instructions for executing the automatic gas density control method for model experiments described in Embodiment 1 are loaded.

[0046] A computer-readable storage medium can be a tangible device that holds and stores instructions for use by an instruction execution device. A computer-readable storage medium can be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any combination thereof.

[0047] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes. These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes. These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0048] 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 it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for automatically controlling gas density in model experiments, characterized in that, include: Set the target density value; Real-time acquisition of the actual density value of the gaseous medium inside a closed experimental container; The actual density value is compared with the target density value to calculate the density deviation. Generate inflation or deflation operation instructions based on density deviation; The inflation or deflation command is output to the actuator, and the density of the gaseous medium in the sealed experimental container is adjusted by the inflation or deflation operation until the density deviation between the actual density value and the target density value in the sealed experimental container is within the preset range.

2. The method for automatic gas density control in model experiments as described in claim 1, characterized in that, The target density value is calculated and determined based on the gas-liquid density ratio and the density of the liquid medium required for the experiment.

3. The method for automatic gas density control in model experiments as described in claim 1, characterized in that, The process of generating inflation or deflation commands based on density deviation includes: Determine if the absolute value of the density deviation is less than the preset dead zone threshold. If so, continue monitoring the actual density value of the sealed experimental container; otherwise, proceed to the next step. Generate corresponding density control instructions based on density deviation: When the actual density value is less than the target density value, an inflation command is generated to control the gas source to inject a preset high-density gas into the sealed experimental container. When the actual density value is greater than the target density value, an exhaust command is generated to control the exhaust valve to discharge gas from the sealed experimental container.

4. The method for automatic gas density control in model experiments as described in claim 3, characterized in that, When generating inflation or deflation operation commands based on density deviation, a PID control algorithm is used.

5. The method for automatic gas density control in model experiments as described in claim 4, characterized in that, The PID control algorithm includes: Obtain the current density deviation e(t); Based on the current density deviation e(t), proportional, integral, and differential calculations are performed respectively to obtain the proportional term, integral term, and differential term; Summing the proportional, integral, and differential terms yields the total control quantity u(t) = P + I + D; Based on the magnitude of the control quantity u(t), the opening degree or opening and closing frequency of the gas source control valve or exhaust valve is dynamically adjusted, thereby controlling the rate of gas injection or discharge.

6. The method for automatic gas density control in model experiments as described in claim 1, characterized in that, The method also includes a pressure interlock control step: During the inflation or deflation process, the gas pressure value inside the sealed experimental container is obtained in real time. The gas pressure value inside the sealed experimental container is compared with the preset upper pressure threshold and the preset lower pressure threshold. When the gas pressure exceeds the preset pressure upper limit threshold, an emergency venting command and / or a command to stop inflation are generated. When the gas pressure value is lower than the preset lower pressure threshold, a command to prohibit exhaust is generated.

7. The method for automatic gas density control in model experiments as described in claim 1, characterized in that, The method also includes a turbulence interlocking control step: While executing the inflation or deflation command, a turbulence start command is generated to control the turbulence device set inside the sealed experimental container to turbulently mix the gas inside the sealed experimental container. Once the density deviation stabilizes within the preset range, a turbulence stop command is generated to shut down the turbulence device.

8. An automatic gas density control system for model experiments, characterized in that, include: The target setting module is used to set the target density value; The data acquisition module is used to obtain the actual density value of the gaseous medium inside the sealed experimental container in real time. The comparison calculation module is used to compare the actual density value with the target density value and calculate the density deviation. The control decision module is used to generate inflation or deflation operation commands based on density deviation; The instruction execution module is used to output inflation or deflation operation instructions to the actuator to adjust the density of the gaseous medium in the sealed experimental container until the density deviation between the actual density value and the target density value in the sealed experimental container is within a preset range.

9. A computer-readable storage medium for storing one or more programs, characterized in that, The one or more programs include instructions that, when executed by a computing device, cause the computing device to perform any of the methods described in claims 1 to 7.

10. A computing device, characterized in that, include: One or more processors and a memory, wherein the memory stores one or more programs and is configured to be executed by the one or more processors, the one or more programs including instructions for performing any of the methods described in claims 1 to 7.

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