Pressure container pressure acquisition method, system and equipment and storage medium

Abstract

The invention provides a pressure container pressure acquisition method, system and device and a storage medium, and belongs to the field of pressure measurement, and the method comprises the following steps: collecting the displacement and temperature of any measuring point on the external surface of a pressure container in an inflation process through a non-intrusive mode, and constructing a database according to the displacement and temperature; acquiring a real-time displacement value of a certain measuring point on the outer surface of the pressure vessel at the ith moment; in the using process of the pressure container, interpolation is conducted on the real-time displacement value according to the multiple displacement change values in the database, two displacement change values closest to the real-time displacement value in the database are obtained, fitting is conducted on pressure values at the moments corresponding to the two closest displacement change values, and a fitting relation is obtained; and acquiring the pressure value of a certain measuring point on the external surface of the pressure vessel at the ith moment according to the fitting relational expression. According to the invention, the pressure container is not damaged, gas leakage is avoided, and the pressure value acquisition reliability is improved.

Description

Technical Field

[0001] The present invention belongs to the field of pressure measurement, and in particular relates to a pressure vessel pressure acquisition method, system, equipment and storage medium. Background Art

[0002] In the aerospace field, traditional pressure measurement generally uses pressure sensors to perform intrusive measurements on pressure vessels in the aviation field. That is, when using a pressure sensor, it is necessary to open a gas port on the surface of the pressure vessel to collect the pressure. However, using this method for pressure measurement may pose a risk of gas leakage. The high-pressure gas cylinders used in some aerospace power systems have a maximum pressure of more than 20MPa. Once a gas leak occurs, it will not only have a serious impact on other subsystems, but may even affect the success of the launch, with disastrous consequences.

[0003] In summary, when using existing sensors to measure the pressure of high-pressure pressure vessels in high-risk fields such as aviation, aerospace, navigation and nuclear industry, there is a problem of low measurement reliability. Summary of the invention

[0004] In order to overcome the problem of insufficient reliability in measuring the pressure value of a high-pressure pressure vessel, the present invention provides a method for obtaining the pressure of a pressure vessel, comprising the following steps:

[0005] Before using the pressure vessel, the pressure vessel is inflated, and the displacement and temperature of any measuring point on the outer surface of the pressure vessel during the inflation process are collected in a non-invasive manner, and a database is constructed according to the displacement and temperature; the data in the database are multiple inflation pressure values ​​and displacement change values ​​of the pressure vessel surface corresponding to the multiple inflation pressure values ​​one by one;

[0006] During the use of the pressure vessel, the real-time displacement value of a measuring point on the outer surface of the pressure vessel at the i-th moment is collected in a non-invasive manner; the real-time displacement value is interpolated according to a plurality of displacement change values ​​in a database to obtain two displacement change values ​​closest to the real-time displacement value in the database, the two closest displacement change values ​​and the inflation pressure values ​​corresponding to the two closest displacement change values ​​are fitted to obtain a fitting relationship, and the fitting relationship is solved to obtain the pressure value of a measuring point on the outer surface of the pressure vessel at the i-th moment.

[0007] Preferably, the non-invasive method is to collect the displacement of the outer surface of the pressure vessel using a laser vibrometer, and to collect the temperature of the outer surface of the pressure vessel using a temperature sensor attached to the outer surface of the pressure vessel.

[0008] Preferably, the step of constructing a database based on displacement and temperature comprises the following steps:

[0009] Inflate the pressure vessel and collect the temperature T and displacement X of any measuring point on the external surface of the pressure vessel during the inflation process;

[0010] According to the thermal expansion coefficient of the pressure vessel surface material, calculate the displacement change X of the container surface caused by temperature during the inflation process. T ;

[0011] Subtract the container surface displacement X caused by temperature during the inflation process from the container surface displacement X measured by the laser vibrometer T , and obtain the displacement change value X of the container surface caused by the pressure change P ;

[0012] The inflation pressure value P during the container inflation process and the displacement change value X of the container surface caused by the pressure change P Correspondingly, a database is constructed according to the corresponding data.

[0013] Preferably, the plurality of displacement change values ​​include all displacement values ​​when the pressure vessel is inflated from an atmospheric pressure state to a rated pressure state.

[0014] Preferably, the fitting of the two closest displacement change values ​​and the inflation pressure values ​​corresponding to the two closest displacement change values ​​to obtain a fitting relationship, and solving the fitting relationship to obtain the pressure value of a certain measuring point on the outer surface of the pressure vessel at the i-th moment comprises the following steps:

[0015] Find the two displacement change values ​​X with the smallest absolute difference from the real-time displacement value in the database Pj and X Pj+1 ;

[0016] Read and X in the database respectively Pj and X Pj+1 The corresponding inflation pressure value P j and P j+1 , using the least squares method to find (X Pj , P j ) and (X Pj+1 , P j+1 ) is fitted to obtain a fitting relationship;

[0017] Substitute the real-time displacement value into the fitting equation to obtain the pressure value P corresponding to the i-th moment i .

[0018] Preferably, the fitting relationship is:

[0019] (P i -P j ) / (P j+1 -P j )=(X i -X Pj) / (X Pj+1 -X Pj )

[0020] Where, X i is the real-time displacement value of a measuring point on the external surface of the pressure vessel at the i-th moment; P i is the pressure value of a measuring point on the external surface of the pressure vessel at the i-th moment; X Pj and X Pj+1 are the two displacement change values ​​with the smallest absolute value of the difference from the real-time displacement value; P j and P j+1 and X Pj and X Pj+1 The corresponding inflation pressure value P j and P j+1 .

[0021] The present invention also provides a pressure vessel pressure acquisition system, comprising:

[0022] A database construction module is used to inflate the pressure vessel before using it, collect the displacement and temperature of any measuring point on the external surface of the pressure vessel during the inflation process in a non-invasive manner, and construct a database based on the displacement and temperature; the data in the database are multiple inflation pressure values ​​and displacement change values ​​of the pressure vessel surface corresponding to the multiple inflation pressure values ​​one by one;

[0023] The pressure acquisition module is used to collect the real-time displacement value of a certain measuring point on the outer surface of the pressure vessel at the i-th moment in a non-invasive manner during the use of the pressure vessel; interpolate the real-time displacement value according to multiple displacement change values ​​in the database to obtain two displacement change values ​​closest to the real-time displacement value in the database, fit the two closest displacement change values ​​and the inflation pressure values ​​corresponding to the two closest displacement change values ​​to obtain a fitting relationship, and solve the fitting relationship to obtain the pressure value of a certain measuring point on the outer surface of the pressure vessel at the i-th moment.

[0024] The present invention also provides a computer device, comprising a memory and a processor; the memory stores a computer program, and the processor is used to run the computer program in the memory to execute the pressure vessel pressure acquisition method.

[0025] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program is suitable for being loaded by a processor to execute the pressure vessel pressure acquisition method.

[0026] The pressure vessel pressure acquisition method, system, device and storage medium provided by the present invention have the following beneficial effects:

[0027] The present invention collects the displacement and temperature of any measuring point on the outer surface of the pressure vessel during the inflation process in a non-invasive manner, and can construct a database of multiple inflation pressure values ​​and displacement change values ​​of the pressure vessel surface corresponding to the multiple inflation pressure values; during the use of the pressure vessel, a fitting relationship can be obtained by fitting the two displacement change values ​​closest to the real-time displacement value of a certain measuring point in the database, and the pressure value of a certain measuring point can be conveniently calculated through the fitting relationship. This method will not cause damage to the pressure vessel itself, avoids the occurrence of gas leakage caused by invasive measurement, and improves the reliability of pressure value acquisition. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiment of the present invention and its design scheme, the following briefly introduces the drawings required for this embodiment. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 The present invention is a flowchart of a method for obtaining pressure of a pressure vessel according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention and implement it, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the scope of protection of the present invention.

[0031] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the technical solutions of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In addition, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified or limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In the description of the present invention, unless otherwise specified, "plurality" means two or more, which will not be described in detail here.

[0033] Example

[0034] The present invention provides a method for obtaining pressure of a pressure vessel, specifically: Figure 1 As shown, the following steps are included:

[0035] Step 1: Before using the pressure vessel, inflate the pressure vessel, collect the displacement and temperature of any measuring point on the external surface of the pressure vessel during the inflation process in a non-invasive manner, and build a database based on the displacement and temperature; the data in the database are multiple inflation pressure values ​​and displacement change values ​​of the pressure vessel surface corresponding to the multiple inflation pressure values. The specific steps are as follows:

[0036] (1) A temperature sensor is attached to a measuring point on the outer surface of the high-pressure container (the temperature sensor is a wall temperature sensor, which has high reliability and is very small in size. It only needs to be attached to the surface of the gas cylinder and will not have any impact on the gas cylinder). The high-pressure container is inflated and the pressure value during the inflation process is recorded. The temperature T and displacement X of the measuring point during the inflation process are respectively collected using a temperature sensor and a laser vibrometer.

[0037] (2) Based on the thermal expansion coefficient of the high-pressure container surface material, calculate the container surface displacement change X caused by temperature during the inflation process T ;

[0038] Under the action of pressure, the surface of the pressure vessel will expand and deform, and this deformation mainly includes the linear expansion X caused by the temperature rise caused by the work done by the gas during the inflation process. T and elastic deformation of the container material caused by pressure changes X P , and the elastic deformation follows Hooke's law of material deformation.

[0039] Linear expansion caused by temperature rise X T It can be expressed as:

[0040] X T =α×L0×ΔT.

[0041] Among them, α is the linear expansion coefficient corresponding to the container material, L0 is the wall thickness of the container material, and ΔT is the temperature change.

[0042] (3) Subtract the container surface displacement X caused by temperature during the inflation process from the container surface displacement X measured by the laser vibrometer T , and obtain the displacement change value X of the container surface caused by the pressure change P ;

[0043] (4) The inflation pressure value P during the container inflation process and the displacement change value X caused by the pressure change P Correspondingly, it is written into the displacement acquisition software as a database to obtain the constructed database.

[0044] The data in the above process are obtained before the high-pressure vessel is put into use.

[0045] Step 2: During the use of the pressure vessel, the real-time displacement value of a measuring point on the outer surface of the pressure vessel at the i-th moment is collected in a non-invasive manner; the real-time displacement value is interpolated according to multiple displacement change values ​​in the database to obtain the two displacement change values ​​closest to the real-time displacement value in the database, the two closest displacement change values ​​and the inflation pressure values ​​corresponding to the two closest displacement change values ​​are fitted to obtain a fitting relationship, and the fitting relationship is solved to obtain the pressure value of a measuring point on the outer surface of the pressure vessel at the i-th moment.

[0046] During the use of the high-pressure container, a temperature sensor is attached to a certain measuring point on the outer surface of the high-pressure container (the temperature sensor is a wall temperature sensor, which has extremely high reliability and a small size. It only needs to be attached to the surface of the gas cylinder and will not have any impact on the gas cylinder). The temperature sensor and the laser vibrometer are used to collect the temperature T of the measuring point at the i-th moment. i And displacement value X i , then proceed as follows:

[0047] (1) Find the two displacement change values ​​X with the smallest absolute difference from the real-time displacement value in the database Pj and X Pj+1 ;

[0048] (2) Read and X in the database respectively Pj and X Pj+1 The corresponding inflation pressure value P j and P j+1 , using the least squares method to find (X Pj , P j ) and (X Pj+1 , P j+1 ) to get the fitting relationship, as follows:

[0049] (Pi -P j ) / (P j+1 -P j )=(X i -X Pj ) / (X Pj+1 -X Pj ).

[0050] Where, X i is the real-time displacement value of a measuring point on the external surface of the pressure vessel at the i-th moment; P i is the pressure value of a measuring point on the external surface of the pressure vessel at the i-th moment; X Pj and X Pj+1 are the two displacement change values ​​with the smallest absolute value of the difference from the real-time displacement value; P j and P j+1 and X Pj and X Pj+1 The corresponding inflation pressure value P j and P j+1 .

[0051] (3) X i , X Pj , P j , X Pj+1 , P j+1 Substituting into the fitting relationship in (2), we can get the pressure value P corresponding to the i-th moment: i .

[0052] The present invention also provides a pressure vessel pressure acquisition system, including a database construction module and a pressure acquisition module. The database construction module is used to inflate the pressure vessel before using it, collect the displacement and temperature of any measuring point on the outer surface of the pressure vessel during the inflation process in a non-invasive manner, and build a database based on the displacement and temperature; the data in the database are multiple inflation pressure values ​​and displacement change values ​​of the pressure vessel surface corresponding to the multiple inflation pressure values; the pressure acquisition module is used to collect the real-time displacement value of a certain measuring point on the outer surface of the pressure vessel at the i-th moment in a non-invasive manner during the use of the pressure vessel; interpolate the real-time displacement value according to the multiple displacement change values ​​in the database to obtain the two displacement change values ​​closest to the real-time displacement value in the database, fit the two closest displacement change values ​​and the inflation pressure values ​​corresponding to the two closest displacement change values ​​to obtain a fitting relationship, and solve the fitting relationship to obtain the pressure value of a certain measuring point on the outer surface of the pressure vessel at the i-th moment.

[0053] The present invention also provides a computer device, including a memory and a processor; the memory stores a computer program, and the processor is used to run the computer program in the memory to execute the pressure acquisition method of the pressure vessel.

[0054] The present invention also provides a computer-readable storage medium, which stores a computer program. The computer program is suitable for being loaded by a processor to execute the pressure acquisition method for a pressure vessel.

[0055] The above embodiments are only preferred specific implementation methods of the present invention, and the protection scope of the present invention is not limited thereto. Any simple changes or equivalent replacements of the technical solutions that can be obviously obtained by any technician familiar with the field within the technical scope disclosed in the present invention belong to the protection scope of the present invention.

Claims

1. A method for obtaining pressure of a pressure vessel, characterized in that: The steps include: Before using the pressure vessel, the pressure vessel is inflated, and the displacement and temperature of any measuring point on the outer surface of the pressure vessel during the inflation process are collected in a non-invasive manner, and a database is constructed according to the displacement and temperature; the data in the database are multiple inflation pressure values ​​and displacement change values ​​of the pressure vessel surface corresponding to the multiple inflation pressure values ​​one by one; During the use of the pressure vessel, the real-time displacement value of a measuring point on the outer surface of the pressure vessel at the i-th moment is collected in a non-invasive manner; the real-time displacement value is interpolated according to a plurality of displacement change values ​​in a database to obtain two displacement change values ​​closest to the real-time displacement value in the database, the two closest displacement change values ​​and the inflation pressure values ​​corresponding to the two closest displacement change values ​​are fitted to obtain a fitting relationship, and the fitting relationship is solved to obtain the pressure value of a measuring point on the outer surface of the pressure vessel at the i-th moment.

2. The method for obtaining pressure of a pressure vessel according to claim 1, characterized in that: The non-invasive method is to use a laser vibrometer to collect the displacement of the outer surface of the pressure vessel, and to use a temperature sensor attached to the outer surface of the pressure vessel to collect the temperature of the outer surface of the pressure vessel.

3. The method for obtaining pressure of a pressure vessel according to claim 2, characterized in that: The step of constructing a database based on displacement and temperature includes the following steps: Inflate the pressure vessel and collect the temperature T and displacement X of any measuring point on the external surface of the pressure vessel during the inflation process; According to the thermal expansion coefficient of the pressure vessel surface material, calculate the displacement change X of the container surface caused by temperature during the inflation process. T ; Subtract the container surface displacement X caused by temperature during the inflation process from the container surface displacement X measured by the laser vibrometer T , and obtain the displacement change value X of the container surface caused by the pressure change P ; The inflation pressure value P during the container inflation process and the displacement change value X of the container surface caused by the pressure change P Correspondingly, a database is constructed according to the corresponding data.

4. The method for obtaining pressure of a pressure vessel according to claim 1, characterized in that: The plurality of displacement change values ​​include all displacement values ​​when the pressure vessel is inflated from an atmospheric pressure state to a rated pressure state.

5. The method for obtaining pressure of a pressure vessel according to claim 3, characterized in that: The fitting of the two closest displacement change values ​​and the inflation pressure values ​​corresponding to the two closest displacement change values ​​to obtain a fitting relationship, and solving the fitting relationship to obtain the pressure value of a certain measuring point on the outer surface of the pressure vessel at the i-th moment, comprises the following steps: Find the two displacement change values ​​X with the smallest absolute difference from the real-time displacement value in the database Pj and X Pj+1 ; Read and X in the database respectively Pj and X Pj+1 The corresponding inflation pressure value P j and P j+1 , using the least squares method to find (X Pj , P j ) and (X Pj+1 , P j+1 ) is fitted to obtain a fitting relationship; Substitute the real-time displacement value into the fitting equation to obtain the pressure value P corresponding to the i-th moment i .

6. The method for obtaining pressure of a pressure vessel according to claim 5, characterized in that: The fitting relationship is: (P i -P j ) / (P j+1 -P j )=(X i -X Pj ) / (X Pj+1 -X Pj ), Where, X i is the real-time displacement value of a measuring point on the external surface of the pressure vessel at the i-th moment; P i is the pressure value of a measuring point on the external surface of the pressure vessel at the i-th moment; X Pj and X Pj+1 are the two displacement change values ​​with the smallest absolute value of the difference from the real-time displacement value; P j and P j+1 and X Pj and X Pj+1 The corresponding inflation pressure value P j and P j+1 .

7. A pressure vessel pressure acquisition system, characterized in that: include: A database construction module is used to inflate the pressure vessel before using it, collect the displacement and temperature of any measuring point on the external surface of the pressure vessel during the inflation process in a non-invasive manner, and construct a database based on the displacement and temperature; the data in the database are multiple inflation pressure values ​​and displacement change values ​​of the pressure vessel surface corresponding to the multiple inflation pressure values ​​one by one; The pressure acquisition module is used to collect the real-time displacement value of a certain measuring point on the outer surface of the pressure vessel at the i-th moment in a non-invasive manner during the use of the pressure vessel; interpolate the real-time displacement value according to multiple displacement change values ​​in the database to obtain two displacement change values ​​closest to the real-time displacement value in the database, fit the two closest displacement change values ​​and the inflation pressure values ​​corresponding to the two closest displacement change values ​​to obtain a fitting relationship, and solve the fitting relationship to obtain the pressure value of a certain measuring point on the outer surface of the pressure vessel at the i-th moment.

8. A computer device, characterized in that: It comprises a memory and a processor; the memory stores a computer program, and the processor is used to run the computer program in the memory to execute the pressure acquisition method of a pressure vessel according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is suitable for being loaded by a processor to execute the method for obtaining the pressure of a pressure vessel according to any one of claims 1 to 6.

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