A method and system for calibrating parameters of high-altitude oxygen supply equipment

Abstract

This invention discloses a method and system for calibrating parameters of high-altitude oxygen supply equipment. The method involves creating a 3D model of the target area to be supplied with oxygen, setting initial oxygen supply parameters for the 3D model, meshing the 3D model, and simulating the oxygen supply process using ANSYS FLUENT software. Simulation data is obtained by changing the initial oxygen supply parameters. The simulation data is then normalized, and the oxygen supply effect score under different parameter schemes is calculated based on the normalized data and the proposed oxygen supply effect score calculation formula, thus obtaining a suitable parameter calibration scheme. This invention enables rapid analysis and calculation of parameters for high-altitude oxygen supply equipment, resulting in a scientific configuration scheme for key parameters of high-altitude oxygen supply equipment, better serving related work on high-altitude oxygen supply.

Description

Technical Field

[0001] This invention relates to the field of oxygen supply technology, and in particular to a method and system for calibrating parameters of high-altitude oxygen supply equipment. Background Technology

[0002] The air is thin in high-altitude areas, and oxygen levels are low both indoors and outdoors. Prolonged exposure to high oxygen levels can harm physical and mental health, leading to a range of altitude-related illnesses. To address the health hazards of high-altitude hypoxia, alleviate altitude sickness symptoms, and improve the quality of life for people in these areas, oxygen supply facilities are gradually becoming more widespread.

[0003] Oxygen supply equipment is a type of device developed for specific oxygen supply needs. Common oxygen supply methods include nasal inhalation and diffusion oxygen supply. Nasal inhalation requires wearing a cannula at all times, which is extremely inconvenient in daily work and life. Diffusion oxygen supply maintains the oxygen demand of a specific location by outputting a large amount of oxygen, but its utilization rate is usually low and its oxygen consumption is high. This is because the oxygen supply method of diffusion oxygen supply equipment is usually not precise enough, resulting in a lot of oxygen being wasted. Furthermore, uneven oxygen concentration distribution means that low concentrations are ineffective, while high concentrations can be harmful to human health.

[0004] There is considerable research on oxygen supply equipment. For example, publication number 209253974U, "A Portable Diffusion Oxygen Supply System, Oxygen Supply Device and Intelligent Oxygen Supply System," explores an oxygen supply device for creating an oxygen-rich environment within a suitable range; publication number 214619056U, "A Plateau Oxygen Disperser and Oxygen Supply Device," introduces an oxygen supply device that can achieve uniform dispersion of oxygen within a tent; and publication number 212719211U, "A Diffusion Oxygen Supply System for Hospital Rooms in Plateau Areas," envisions a diffusion oxygen supply system serving hospital wards in plateau areas. Given that precise oxygen supply can effectively reduce resource waste, some studies have focused on its implementation. For example, the patent application 216934482U, titled "A Localized Diffusion Oxygen Supply Device for High-Altitude Areas," improves local oxygen concentration through localized diffusion oxygen supply. The patent application 112346488A, titled "A Control Method for Diffusion Oxygen Supply in High-Altitude Areas," suggests regional oxygen supply within large areas to avoid excessive oxygen supply and waste. The patent application 104536351A, titled "An Indoor Diffusion Oxygen Supply Controller and Its Operation Method," focuses on controlling the amount of indoor diffusion oxygen supply to ensure that the oxygen concentration is within a comfortable range for humans. However, previous studies have mostly focused on the design and overall operation of the equipment, primarily using oxygen supply devices to deliver oxygen to target areas to achieve a set concentration. The power and oxygen delivery speed of each oxygen supply device for different space sizes are mainly adjusted manually, which can easily lead to excessively high or low oxygen concentrations in the target area, failing to achieve optimal operating conditions and thus wasting oxygen resources. Summary of the Invention

[0005] The purpose of this invention is to provide a method and system for calibrating parameters of high-altitude oxygen supply equipment, so as to overcome the problem that existing oxygen supply equipment parameters cannot enable the oxygen supply equipment to reach its optimal working state.

[0006] A method for calibrating parameters of high-altitude oxygen supply equipment includes the following steps:

[0007] S1. Perform a 3D model of the target area to be supplied with oxygen, and set the initial parameters for oxygen supply for the 3D model of the target area to be supplied with oxygen; at the same time, perform mesh generation on the 3D model.

[0008] S2 simulates the oxygen supply process using a meshed 3D model and ANSYS FLUENT software. It obtains corresponding simulation data by changing the initial oxygen supply parameters. The obtained simulation data is normalized, and the oxygen supply effect score under different parameter schemes is calculated based on the normalized data and the proposed oxygen supply effect score calculation formula, so as to obtain a suitable parameter calibration scheme.

[0009] Preferably, a 3D model of the target area to be supplied with oxygen is constructed using CATIA software, and corresponding oxygen supply ports are added. NUMECA HEXPRESS software is then used to mesh the 3D geometric model.

[0010] Preferably, the initial parameters of the oxygen supply equipment include an initial oxygen volume ratio of vp0, an initial height of the oxygen inlet from the target area of ​​h0, an initial angle of the oxygen inlet of a0, and an final oxygen volume ratio of vp. t The final value of the distance h between the oxygen inlet and the target area. t Oxygen inlet angle end value a t And the oxygen volume percentage adjustment step size τ v The oxygen port distance to the target area height adjustment step size τ h τ is the step size for adjusting the oxygen inlet angle. a .

[0011] Preferably, a 3D model of the target area to be supplied with oxygen is constructed using CATIA software, and oxygen supply ports are added.

[0012] Preferably, the 3D geometric model obtained from 3D modeling is meshed using NUMECA HEXPRESS software.

[0013] Preferably, the height of the oxygen inlet from the target area is determined, and the height of the oxygen inlet from the target area is taken as h, while the current value of the oxygen inlet angle is set as a = a0.

[0014] Preferably, the grid size of the oxygen supply port cross section is 0.5 mm, and the grid size of the gap is 0.25 mm.

[0015] Preferably, the oxygen volume percentage in the output gas from the oxygen inlet is determined based on whether the current value vp is equal to the final value vp. t If they are equal, then do not increase; otherwise, let vp = vp + τ. v Update the current value of the oxygen volume percentage in the output gas from the oxygen inlet;

[0016] Based on whether the current value 'a' of the oxygen inlet angle is equal to the final value 'a' of the oxygen inlet angle. t Determine whether to increase the angle between the oxygen inlet and the bed surface. If the angle is equal, do not increase it; otherwise, let a = a + τ. a Update the current value of the oxygen inlet angle.

[0017] Preferably, the current height h of the oxygen inlet is equal to the final height h of the oxygen inlet from the target area. t Determine whether to increase the height of the oxygen inlet. If the height is equal, do not increase it; otherwise, let h = h + τ. h Update the height value of the oxygen inlet.

[0018] A parameter calibration system for high-altitude oxygen supply equipment includes a modeling module and a calibration module;

[0019] The modeling module is used to perform three-dimensional modeling of the target area to be oxygenated, and at the same time, set the initial oxygenation parameters within the three-dimensional model of the target area to be oxygenated, and perform mesh generation on the three-dimensional model.

[0020] The calibration module simulates the oxygen supply process using a meshed 3D model and ANSYS FLUENT software. It obtains corresponding simulation data by changing the initial oxygen supply parameters. The obtained simulation data is normalized, and the oxygen supply effect score under different parameter schemes is calculated based on the normalized data and the proposed oxygen supply effect score calculation formula, thus obtaining a suitable parameter calibration scheme.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects:

[0022] This invention discloses a method for calibrating parameters of high-altitude oxygen supply equipment. The method involves creating a 3D model of the target area to be supplied with oxygen, setting initial oxygen supply parameters within the 3D model, meshing the 3D model, and simulating the oxygen supply process using ANSYS FLUENT software. Simulation data is obtained by changing the initial oxygen supply parameters. The obtained simulation data is then normalized, and the oxygen supply effect score under different parameter schemes is calculated based on the normalized data and the proposed oxygen supply effect score calculation formula. This yields a suitable parameter calibration scheme. This invention enables rapid analysis and calculation of parameters for high-altitude oxygen supply equipment, resulting in a scientific configuration scheme for key parameters of high-altitude oxygen supply equipment, thus better serving high-altitude oxygen supply-related work.

[0023] Preferably, the present invention determines whether the current value of the gas volume percentage (vp) is equal to the final value of the oxygen volume percentage (vp). t Is the current value 'a' of the oxygen inlet angle equal to the final value 'a' of the oxygen inlet angle? t Determine whether to increase the angle between the oxygen inlet and the bed surface; check if the current height h of the oxygen inlet is equal to the final height h of the oxygen inlet from the target area. t This allows for the determination of whether to increase the height of the oxygen inlet to adjust different simulation parameters in order to obtain accurate calibration results, greatly improving the scientific nature of the calibration process and increasing the accuracy of the calibration results. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a three-dimensional geometric model in an embodiment of the present invention.

[0025] Figure 2 This is a flowchart of the parameter calibration method for high-altitude oxygen supply equipment in an embodiment of the present invention. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0027] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0028] like Figure 2 As shown, a method for calibrating parameters of high-altitude oxygen supply equipment includes the following steps:

[0029] S1. Perform a 3D model of the target area to be supplied with oxygen, and set the initial oxygen supply parameters of the oxygen supply equipment for the 3D model of the target area to be supplied with oxygen; at the same time, perform mesh generation on the 3D model.

[0030] The initial parameters of the oxygen supply equipment include the initial oxygen volume ratio (vp0), the initial height of the oxygen inlet from the target area (h0), the initial angle of the oxygen inlet (a0), and the final oxygen volume ratio (vp). t The final value of the distance h between the oxygen inlet and the target area. t Oxygen inlet angle end value a t And the oxygen volume percentage adjustment step size τ v The oxygen port distance to the target area height adjustment step size τ h τ is the step size for adjusting the oxygen inlet angle. a .

[0031] Let the current height of the oxygen inlet from the target area be h = h0.

[0032] Specifically, a 3D model of the target area (3D house, bedroom) to be supplied with oxygen was constructed using CATIA software, and corresponding oxygen supply ports were added. NUMECA HEXPRESS software was used to mesh the 3D geometric model.

[0033] A 3D model of the target area to be supplied with oxygen is constructed using CATIA software. The model includes the size of the target area. This application uses a residential room as the target area, and it is necessary to determine the size of the room, as well as the location and size of the room door, window, and bed. Among them, a 1 mm narrow gap needs to be set at the door and window to simulate the door and window effect.

[0034] S2 simulates the oxygen supply process using a meshed 3D model and ANSYS FLUENT software. It obtains corresponding simulation data by changing the initial oxygen supply parameters. The obtained simulation data is normalized, and the oxygen supply effect score under different parameter schemes is calculated based on the normalized data and the proposed oxygen supply effect score calculation formula. The most suitable parameter calibration scheme can then be obtained to serve the design, installation and maintenance of oxygen supply equipment.

[0035] Meshing of the 3D model of the target area: The 3D model of the target area was meshed using NUMECA HEXPRESS software. The mesh size for houses was 300 mm, and the mesh size for other objects in the target area was 8 mm.

[0036] Determine the height of the oxygen inlet from the target area: Take the height of the oxygen inlet from the target area as h, and at the same time let the current value of the oxygen inlet angle be a = a0.

[0037] Determine the angle between the oxygen inlet and the target area: Set the initial angle between the oxygen supply port and the target area as 'a'.

[0038] Set up the oxygen supply port model on the 3D house model: Similarly, use CATIA software to set the oxygen supply port in the center above the head of the bed. The size of the oxygen supply port is set according to the actual high-altitude oxygen supply equipment. The height of the oxygen supply port is h, and the angle between the oxygen supply port and the target area is a.

[0039] Meshing of the oxygen supply port model: The oxygen supply port model was meshed using NUMECA HEXPRESS software. The mesh size for the oxygen supply port cross-section was 0.5 mm, and the mesh size for the gaps was 0.25 mm. Simultaneously, the current volume percentage of oxygen in the output gas from the oxygen inlet was set to vp = vp0.

[0040] Example

[0041] This application takes the area within a bedroom as the target oxygen supply zone as an example:

[0042] Simulation of the oxygen supply process:

[0043] like Figure 1 As shown,

[0044] A 3D model of the target area to be oxygenated is created, and initial oxygen supply parameters are set within the 3D model of the target area. Simultaneously, the 3D model is meshed. The oxygen supply process is simulated based on the meshed 3D model and ANSYS FLUENT software. Simulation data is obtained by changing the initial oxygen supply parameters. First, simulation calculation parameters are set in ANSYS FLUENT software, including calculation method, gas composition, velocity inlet boundary conditions, pressure outlet boundary conditions, initial flow field, gas pressure, diffusion coefficients of nitrogen and oxygen, k-ξ turbulence model parameters, and simulation calculation step size.

[0045] The calculation method employed a second-order accurate unsteady incompressible solver and a k-ξ turbulence model. The turbulence terms k and ξ in the k-ξ turbulence model were set to second-order accuracy. The gas composition included nitrogen and oxygen. In the velocity inlet boundary conditions, the inlet velocity was specified as 0.4 m / s, perpendicular to the inlet cross-section, with room temperature and a turbulence characteristic length of 0.01 m. The volume components of oxygen and nitrogen were specified based on the volume ratio vp of pure oxygen and the air mixture in the simulated region. In the pressure outlet boundary conditions, the outlet gauge pressure was 0 Pa, the temperature was room temperature, and the volume components of nitrogen and oxygen were determined according to the simulated region. The turbulence parameters were set to the default values ​​in ANSYS FLUENT software. In the initial flow field, the volume components of nitrogen and oxygen were determined according to local conditions, and room temperature was specified based on the actual situation. The gas pressure and the diffusion coefficients of nitrogen and oxygen were determined based on the actual altitude. The simulation calculation step size was 1 second, with 1800 steps. Oxygen concentration data at the head position was recorded once per simulation step to obtain time-series oxygen concentration data. The distance between the top of the head and the wall is 10cm, the distance between the chin and the wall is 30cm, the distance between the back of the head and the bed surface is 5cm, and the distance between the face and the bed surface is 25cm.

[0046] During the simulation, the current value (vp) of the oxygen volume percentage in the output gas from the oxygen inlet is checked against the final value (vp) of the oxygen volume percentage. t If they are equal, then do not increase; otherwise, let vp = vp + τ. v Update the current value of the oxygen volume percentage in the output gas from the oxygen inlet.

[0047] Determine whether to increase the angle between the oxygen inlet and the bed surface: Check if the current value 'a' of the oxygen inlet angle is equal to the final value 'a' of the oxygen inlet angle. t Determine whether to increase the angle between the oxygen inlet and the bed surface. If the angle is equal, do not increase it; otherwise, let a = a + τ. a Update the current value of the oxygen inlet angle.

[0048] Determine whether to increase the height of the oxygen inlet: Check if the current height h of the oxygen inlet is equal to the final height h of the oxygen inlet from the target area. tDetermine whether to increase the height of the oxygen inlet. If the height is equal, do not increase it; otherwise, let h = h + τ. h Update the oxygen inlet height value until h = h t .

[0049] Based on the above data simulation process, the output oxygen concentration time-series data is used to calculate the scores of the simulation data under different parameters. Based on the oxygen concentration time-series data, for each parameter (index i for time series), three corresponding oxygen supply indicators are extracted: achieving the desired concentration C. exp Required time T i e At the end of the simulation, the oxygen concentration C i t and the percentage of time periods with concentrations not less than the expected concentration (P) i e This leads to three data sets T. e C t and P e If the oxygen concentration at the head position does not reach the expected value at the end of the simulation, then T is taken. i e To double the simulation time, take P i e The score is 0. Meanwhile, the oxygen supply effectiveness score for each plan is calculated as follows:

[0050] a: The expected value T of the time required to reach the desired concentration. exp Include all T i e The obtained dataset is then normalized to the interval [0,1] to obtain the normalized data, denoted as t. exp and The formula used for normalization is:

[0051]

[0052]

[0053] b: Similarly, the desired concentration C exp Include all The obtained dataset is then normalized to [0,1], resulting in normalized data, denoted as c. exp and

[0054] c: Calculate the oxygen supply effect score E for each calibration scheme according to Formula 3. i .

[0055]

[0056] Based on the oxygen supply effect score, select the calibration scheme with the highest score; the calibration process for key parameters is now complete.

[0057] In summary, based on the oxygen supply assessment method, and by carrying out condition improvement work according to the assessment results, it helps to extend the service life of the turnout system and provides a reference for the design, installation, and maintenance of oxygen supply equipment. The method described can effectively guide engineering practice.

[0058] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A method for calibrating parameters of high-altitude oxygen supply equipment, characterized in that, Includes the following steps: S1. Perform a 3D model of the target area to be supplied with oxygen, and set the initial parameters for oxygen supply for the 3D model of the target area to be supplied with oxygen; at the same time, perform mesh generation on the 3D model. S2, based on a meshed 3D model and ANSYS FLUENT software, simulates the oxygen supply process. By changing the initial oxygen supply parameters, the corresponding simulation data is obtained. The obtained simulation data is normalized, and the oxygen supply effect score under different parameter schemes is calculated based on the normalized data and the proposed oxygen supply effect score calculation formula, so as to obtain a suitable parameter calibration scheme. Determine the current volume percentage of oxygen in the output gas from the oxygen inlet. Is it equal to the final value of oxygen volume percentage? If they are equal, the current value of the oxygen volume ratio in the output gas from the oxygen inlet will not be increased. Otherwise Update the current value of the oxygen volume percentage in the output gas from the oxygen inlet; Adjust the step size for the oxygen volume percentage; Based on the current value of the oxygen inlet angle Is it equal to the end value of the oxygen inlet angle? Determine whether to increase the angle between the oxygen inlet and the bed surface. If it is equal, do not increase it; otherwise, let... Update the current value of the oxygen inlet angle; Adjust the step size for the oxygen inlet angle.

2. The method for calibrating parameters of a high-altitude oxygen supply equipment according to claim 1, characterized in that, A 3D model of the target area to be supplied with oxygen was constructed using CATIA software, and corresponding oxygen supply ports were added; the 3D geometric model was meshed using NUMECA HEXPRESS software.

3. The method for calibrating parameters of a high-altitude oxygen supply equipment according to claim 1, characterized in that, The initial parameters of the oxygen supply equipment include the initial value of the oxygen volume ratio. Initial value of the distance between the oxygen inlet and the target area Initial value of oxygen inlet angle Oxygen volume percentage final value The final value of the distance between the oxygen inlet and the target area. End value of oxygen inlet angle and the step size for adjusting the oxygen volume percentage Adjusting the step size of the oxygen port's distance from the target area Oxygen inlet angle adjustment step size .

4. The method for calibrating parameters of a high-altitude oxygen supply equipment according to claim 1, characterized in that, A 3D model of the target area to be supplied with oxygen was created using CATIA software, and oxygen supply ports were added.

5. The method for calibrating parameters of a high-altitude oxygen supply equipment according to claim 1, characterized in that, The 3D geometric model obtained from 3D modeling was meshed using the NUMECAHEXPRESS software.

6. The method for calibrating parameters of a high-altitude oxygen supply equipment according to claim 1, characterized in that, Determine the height of the oxygen inlet from the target area, and take the height of the oxygen inlet from the target area as... At the same time, set the current value of the oxygen inlet angle. , This is the initial value of the oxygen inlet angle.

7. A method for calibrating parameters of a high-altitude oxygen supply equipment according to claim 2, characterized in that, The grid size of the oxygen supply port cross section is 0.5 mm, and the grid size of the gaps is 0.25 mm.

8. The method for calibrating parameters of a high-altitude oxygen supply equipment according to claim 1, characterized in that, Based on the current height of the oxygen inlet Is it equal to the end value of the height of the oxygen inlet from the target area? Determine whether to increase the height of the oxygen inlet. If the height is equal, do not increase it; otherwise, set... Update the oxygen inlet height value. Adjust the step size for the distance between the oxygen port and the target area.

9. A parameter calibration system for high-altitude oxygen supply equipment, characterized in that, Includes a modeling module and a calibration module; The modeling module is used to perform three-dimensional modeling of the target area to be oxygenated, and at the same time, set the initial oxygenation parameters within the three-dimensional model of the target area to be oxygenated, and perform mesh generation on the three-dimensional model. The calibration module simulates the oxygen supply process using a meshed 3D model and ANSYS FLUENT software. It obtains corresponding simulation data by changing the initial oxygen supply parameters. The obtained simulation data is normalized, and the oxygen supply effect score under different parameter schemes is calculated based on the normalized data and the proposed oxygen supply effect score calculation formula, so as to obtain a suitable parameter calibration scheme. Determine the current volume percentage of oxygen in the output gas from the oxygen inlet. Is it equal to the final value of oxygen volume percentage? If they are equal, then the current value of the oxygen volume ratio in the output gas from the oxygen inlet will not be increased; otherwise, let... , Adjust the step size for the oxygen volume percentage and update the current value of the oxygen volume percentage in the output gas from the oxygen inlet. Based on the current value of the oxygen inlet angle Is it equal to the end value of the oxygen inlet angle? Determine whether to increase the angle between the oxygen inlet and the bed surface. If it is equal, do not increase it; otherwise, let... Update the current value of the oxygen inlet angle. Adjust the step size for the oxygen inlet angle.

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