Method and system for designing eccentric control structure of metal diaphragm storage tank

Abstract

The invention provides a design method and system for an eccentric control structure of a metal diaphragm storage tank, and the method comprises the steps: designing the width and height of a rib structure with a rectangular cross section according to the radius and thickness of a bent edge of a metal diaphragm and different height positions of the diaphragm, and enabling a rectangular rib to be located at the outer side of the metal diaphragm, the position of the first rectangular rib is determined according to the relative position of the metal diaphragm and the supporting ring when the metal diaphragm is turned over, and then the positions of the subsequent rectangular ribs are determined one by one according to the mass center requirement when the metal diaphragm is turned over. The problem that the mass center of the metal diaphragm deviates greatly in the overturning process is solved, the mass center deviation of the metal diaphragm in the overturning process does not exceed 3% of the diameter of the metal diaphragm, and meanwhile the problem that an existing metal diaphragm cannot be designed according to the requirement of a propelling system for the mass center of a storage tank in the overturning process is solved. In addition, compared with a conventional metal diaphragm structure, the weight of the improved structure is only increased by about 2%.

Description

Technical Field

[0001] The invention relates to the technical field of aerospace pressure vessels, and in particular to a design method and system for an eccentric control structure of a metal diaphragm tank. Background Art

[0002] As a key component of the liquid attitude and orbit control power system of aerospace vehicles, the propellant tank is responsible for the storage and transportation management of propellant. Among the many types of tanks (surface tension tanks, bladder tanks, diaphragm tanks, etc.), metal diaphragm tanks stand out due to their light weight, high reliability and excellent ability to suppress propellant sloshing, and have been widely used.

[0003] The metal diaphragm tank effectively isolates the gas cavity from the liquid cavity in the tank through the metal diaphragm. When the system receives the working instruction, the electric explosion valve is activated, the high-pressure gas in the gas cylinder is reduced by the pressure reducer, and the tank is pressurized at a constant pressure, thereby squeezing out the medium in the liquid cavity and smoothly supplying propellant to the downstream engine.

[0004] However, during the operation of the tank, when the metal diaphragm flips from the air cavity position to the liquid cavity position, the diaphragm is very likely to shift during the discharge process due to the combined influence of factors such as the dispersion of the metal diaphragm's own material properties, the difficulty in avoiding machining tolerances, and structural design. This shift will cause the overall center of mass of the tank to shift laterally, directly causing serious interference to the system's attitude control. Once the degree of shift exceeds the allowable range, it is very likely that the system's attitude control will completely fail, which poses a huge threat to the safety and precise operation of the spacecraft.

[0005] Currently, there is a lack of means to effectively control the flipping eccentricity of the metal diaphragm, and there is also a lack of design methods that meet the system's requirements for fine centroid control of the metal diaphragm discharge throughout the process. Therefore, a structure and design method that can resist the flipping eccentricity of the metal diaphragm are needed.

[0006] At present, in the relevant technical field, there is a lack of reliable means to effectively control the flip eccentricity of the metal diaphragm, and a lack of design methods that meet the system's requirements for fine center of mass control of the metal diaphragm throughout the discharge process. Against the backdrop of the continuous development of aerospace technology and the increasing requirements for the accuracy of aircraft attitude control, this technical shortcoming has seriously restricted the further development of the aerospace industry.

[0007] Through searching the patent literature, it was found that the utility model with the publication number CN207000833U discloses a variable thickness large flow metal diaphragm tank diaphragm for spacecraft. The patent includes a transition cone angle, a spherical crown section, an arc section, a cone column section and a pre-bent edge section. The pre-bent edge section is smoothly connected to the cone column section through the transition cone angle, and the upper end of the cone column section is also smoothly transitioned to the arc section and the spherical crown section in turn; the diameter of the bottom end of the tank diaphragm is 444mm, and the thickness t of the tank diaphragm varies with the downward height h of the top of the spherical crown section. The patent does not involve such effective measures for eccentricity control, and there are obvious deficiencies in the control of tank eccentricity. In addition, the overall weight of the diaphragm is greatly increased, and it is impossible to achieve accurate control of the center of mass of the diaphragm during the entire flipping process.

[0008] In summary, in view of the above-mentioned problems of the prior art, studying a design method and system for an eccentric control structure of a metal diaphragm tank has become a key task that needs to be solved urgently. Summary of the invention

[0009] In view of the defects in the prior art, the object of the present invention is to provide a design method and system for an eccentric control structure of a metal diaphragm tank.

[0010] A design method for an eccentric control structure of a metal diaphragm tank provided by the present invention comprises the following steps:

[0011] Step S1, determining the size parameters of the metal diaphragm, including the radius R of the spherical shell segment of the metal diaphragm 1 , the inclination angle θ of the cone section of the metal diaphragm, the bending radius R of the metal diaphragm 2 , the total height H of the metal diaphragm 1 , the wall thickness of the metal diaphragm t 1 ;

[0012] Step S2, according to the bending radius R of the metal diaphragm 2 and the position of the rectangular ribs, determine the width w of the rectangular ribs, and according to the wall thickness t of the metal diaphragm 1 Determine the height t of the rectangular rib 2 ;

[0013] Step S3, according to the total height H of the metal diaphragm 1 Determine the height H of the support ring 2 ;

[0014] Step S4, determining the height h of the first rectangular rib according to the relative position of the metal diaphragm and the support ring when the metal diaphragm is turned over 1 ;

[0015] Step S5, designing the positions of subsequent rectangular ribs according to the center of mass requirement diagram of the flipping process.

[0016] Preferably, in step S1, the entire metal diaphragm is composed of a curved edge section, a cone section, and a spherical shell section from bottom to top, and the sections are tangentially connected. The inner side of the metal diaphragm is the liquid end, and the outer side of the metal diaphragm is the gas end.

[0017] Preferably, in step S1, the radius R of the spherical shell segment of the metal diaphragm 1 Calculated by the following formula:

[0018]

[0019] Wherein, V is the required volume of the tank; λ is the volume coefficient, and λ is 1.05 to 1.10;

[0020] The inclination angle θ of the cone section of the metal diaphragm is 60 to 80°;

[0021] The bending radius R of the metal diaphragm 2 Take 3 to 6 mm;

[0022] The total height H of the metal diaphragm 1 Calculated by the following formula:

[0023] H 1 =R 1 +R 1 sinθcosθ+R 2 (2)

[0024] Wall thickness of metal diaphragm t 1 Obtained according to discharge pressure difference requirements.

[0025] Preferably, in step S2, the ribs with a rectangular cross section, i.e., the rectangular ribs, are laid on one side of the gas end of the metal diaphragm by rotating around the rotation axis of the metal diaphragm, the sides of the rectangular ribs are perpendicular to the gas end of the metal diaphragm, the connection between the rectangular ribs and the metal diaphragm is provided with a transition fillet, and the outer side of the rectangular ribs is provided with a smooth chamfer;

[0026] The width w of the first rectangular rib is calculated by the following formula:

[0027] w=ηR 2 +0.5(n-1)(3)

[0028] Wherein, η is the width coefficient of the first rectangular rib, which is 1.05 to 1.2; n is the position of the rectangular ribs calculated from bottom to top of the metal diaphragm, the first rectangular rib n=1, the second rectangular rib n=2, the third rectangular rib n=3, and so on;

[0029] Height of rectangular rib t 2 Calculated by the following formula:

[0030] t 2 =μt 1 (4)

[0031] Wherein, μ is the height coefficient of the rectangular rib, and μ is not less than 0.5;

[0032] Chamfer R of rectangular rib 3 , R 4 Take 0.3t 2 .

[0033] Preferably, in step S2, the heights of the rectangular ribs at various positions of the metal diaphragm are the same, and the widths of the rectangular ribs close to the top of the metal diaphragm gradually increase.

[0034] Preferably, in step S3, the bottom of the support ring fits with the curved edge and the conical section of the metal diaphragm, and the height H of the support ring is 2 Take 0.25H 1 .

[0035] Preferably, in step S4, when the metal diaphragm starts to turn over, the distance S between the metal diaphragm and the contact side of the support ring reaches at least 3t. 1 When the top of the support ring corresponds to the position of the metal diaphragm, it is the starting point of the first rectangular rib, and the height h of the first rectangular rib is determined. 1 .

[0036] Preferably, step S5 includes the following sub-steps:

[0037] Step S5.1, simplifying the tank centroid calculation object to the liquid surrounded by the liquid end side of the metal diaphragm and the inner side of the liquid cavity shell;

[0038] Step S5.2, preliminarily determine the position of the next rectangular rib according to the mass center offset condition of the tank required by the system in the mass center requirement diagram, connect the bottom end of the previous rectangular rib with the bottom end of the next rectangular rib, and determine that the maximum eccentric angle of the metal diaphragm flipping is the angle of the connection line of the two rectangular ribs;

[0039] Step S5.3, determining the flipping position of the metal diaphragm at the liquid cavity shell according to the flipping arc lengths of the two rectangular ribs, and calculating the liquid volume and center of mass according to the liquid surrounded by the liquid end of the metal diaphragm and the inner side of the liquid cavity shell at this time;

[0040] Step S5.4, compare the liquid volume value and the center of mass value with the center of mass offset condition of the tank required by the system. If the liquid volume value and the center of mass value do not meet the set requirements, reselect the position of the second rectangular rib and calculate according to steps S5.2 and S5.3 until the liquid volume value and the center of mass value meet the set requirements;

[0041] Step S5.5, repeating steps S5.2 to S5.4, designing the position of each rectangular rib until the number of rectangular ribs is consistent with the number at the point where the centroid requirement changes in the centroid requirement diagram.

[0042] Preferably, in step S5.4, the system requires that the center of mass offset condition of the tank include a center of mass requirement value, a mutation point volume value and a required value range, and the setting requirements include: the center of mass value does not exceed 80% of the center of mass requirement value, the difference between the liquid volume value and the mutation point volume value does not exceed 0.01V6, V6 is the total volume of the tank, and the line connecting the design value points determined based on different liquid volume values ​​and center of mass values ​​does not exceed the required value range.

[0043] The present invention also provides a design system for a metal diaphragm tank eccentric control structure, comprising:

[0044] Module M1, determines the size parameters of the metal diaphragm, including the radius R of the spherical shell segment of the metal diaphragm 1 , the inclination angle θ of the cone section of the metal diaphragm, the bending radius R of the metal diaphragm 2 , the total height H of the metal diaphragm 1 , the wall thickness of the metal diaphragm t 1 ;

[0045] Module M2, according to the bending radius R of the metal diaphragm 2 and the position of the rectangular ribs, determine the width w of the rectangular ribs, and according to the wall thickness t of the metal diaphragm 1 Determine the height t of the rectangular rib 2 ;

[0046] Module M3, based on the total height H of the metal diaphragm 1 Determine the height H of the support ring 2 ;

[0047] Module M4, determines the height h of the first rectangular rib according to the relative position of the metal diaphragm and the support ring when the metal diaphragm is flipped 1 ;

[0048] Module M5 designs the positions of subsequent rectangular ribs according to the center of mass requirement diagram of the flipping process.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] 1. The present invention solves the problem of large center of mass displacement of the metal diaphragm during the flipping process by designing an annular rectangular rib structure on the gas end side of the metal diaphragm, so that the center of mass displacement of the metal diaphragm during the flipping process does not exceed 3% of the diameter of the metal diaphragm.

[0051] 2. The present invention proposes a method for designing the parameters and positions of annular rectangular ribs, which solves the problem that it was previously impossible to design a metal diaphragm based on the system's requirements for the center of mass during the tank flipping process.

[0052] 3. Compared with the conventional metal diaphragm structure, the eccentricity controllable metal diaphragm structure of the present invention only increases by about 2% in weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0054] Figure 1 A schematic diagram of the eccentricity control structure parameters of a metal diaphragm in an embodiment of the present invention;

[0055] Figure 2 A schematic diagram of a metal diaphragm eccentricity control structure flipping in an embodiment of the present invention;

[0056] Figure 3 It is a simplified diagram of the tank centroid calculation object in an embodiment of the present invention;

[0057] Figure 4 A schematic diagram of calculating the flip centroid of a metal diaphragm eccentricity control structure in an embodiment of the present invention;

[0058] Figure 5 FIG. 4 is a diagram showing the general requirement for the center of mass deviation of a tank during an overturning process in an embodiment of the present invention. DETAILED DESCRIPTION

[0059] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0060] Embodiment 1:

[0061] This embodiment provides a design method for a metal diaphragm tank eccentricity control structure, comprising the following steps:

[0062] Step S1, determining the size parameters of the metal diaphragm, including the radius R of the spherical shell segment of the metal diaphragm 1 , the inclination angle θ of the cone section of the metal diaphragm, the bending radius R of the metal diaphragm 2 , the total height H of the metal diaphragm 1 , the wall thickness of the metal diaphragm t 1 .

[0063] Figure 1Schematic diagram of the eccentricity control structure parameters of a metal diaphragm in an embodiment of the present invention.

[0064] like Figure 1 As shown, the metal diaphragm is composed of a curved edge section, a cone section, and a spherical shell section from bottom to top, and each section is tangentially connected. The inner side of the metal diaphragm is the liquid end, and the outer side of the metal diaphragm is the gas end.

[0065] The radius R of the spherical shell of the metal diaphragm 1 Calculated by the following formula:

[0066]

[0067] Wherein, V is the required volume of the tank; λ is the volume coefficient, and λ is 1.05 to 1.10;

[0068] The inclination angle θ of the cone section of the metal diaphragm is 60 to 80°;

[0069] The bending radius R of the metal diaphragm 2 Take 3 to 6 mm;

[0070] The total height H of the metal diaphragm 1 Calculated by the following formula:

[0071] H 1 =R 1 +R 1 sinθcosθ+R 2 (2)

[0072] Wall thickness of metal diaphragm t 1 Select according to the discharge pressure difference requirements.

[0073] Step S2, according to the bending radius R of the metal diaphragm 2 and the position of the rectangular ribs, determine the width w of the rectangular ribs, and according to the wall thickness t of the metal diaphragm 1 Determine the height t of the rectangular rib 2 .

[0074] Specifically, a rib with a rectangular cross section, i.e., a rectangular rib, is laid on one side of the gas end of the metal diaphragm by rotating around the rotation axis of the metal diaphragm, the side of the rectangular rib is perpendicular to the gas end of the metal diaphragm, a transition fillet is provided at the connection between the rectangular rib and the metal diaphragm, and a smooth chamfer is provided on the outer side of the rectangular rib;

[0075] The width w of the first rectangular rib is calculated by the following formula:

[0076] w=ηR 2 +0.5(n-1)(3)

[0077] Wherein, η is the width coefficient of the first rectangular rib, which is 1.05 to 1.2; n is the position of the rectangular ribs calculated from bottom to top of the metal diaphragm, the first rectangular rib n=1, the second rectangular rib n=2, the third rectangular rib n=3, and so on;

[0078] Height of rectangular rib t 2 Calculated by the following formula:

[0079] t 2 =μt 1 (4)

[0080] Wherein, μ is the height coefficient of the rectangular rib, and μ is not less than 0.5;

[0081] Chamfer R of rectangular rib 3 , R 4 Take 0.3t 2 .

[0082] Specifically, the heights of the rectangular ribs at various positions of the metal diaphragm are the same, while the widths of the rectangular ribs close to the top of the metal diaphragm gradually increase.

[0083] Step S3, according to the total height H of the metal diaphragm 1 Determine the height H of the support ring 2 .

[0084] Specifically, the bottom of the support ring fits with the curved edge and the cone section of the metal diaphragm, and the height H of the support ring is 2 Take 0.25H 1 .

[0085] Step S4, determining the height h of the first rectangular rib according to the relative position of the metal diaphragm and the support ring when the metal diaphragm is turned over 1 .

[0086] Figure 2 Schematic diagram of the flipping of a metal diaphragm eccentricity control structure in an embodiment of the present invention.

[0087] like Figure 2 As shown in FIG. 1 , when the metal diaphragm begins to flip, until the distance S between the metal diaphragm and the contact side of the support ring reaches at least 3t 1 When the top of the support ring corresponds to the position of the metal diaphragm, it is the starting point of the first rectangular rib, and the height h of the first rectangular rib is determined. 1 .

[0088] Step S5, designing the positions of subsequent rectangular ribs according to the center of mass requirement diagram of the flipping process.

[0089] Specifically, step S5 includes the following sub-steps:

[0090] Figure 3 This is a simplified diagram of the tank centroid calculation object in an embodiment of the present invention.

[0091] Step S5.1, such as Figure 3 As shown, the object for calculating the centroid of the tank is simplified to the liquid surrounded by the liquid end side of the metal diaphragm and the inner side of the liquid chamber shell.

[0092] Figure 4 A schematic diagram of calculating the flip centroid of a metal diaphragm eccentricity control structure in an embodiment of the present invention; Figure 5 FIG. 4 is a diagram showing the general requirement for the center of mass deviation of a tank during an overturning process in an embodiment of the present invention.

[0093] Step S5.2, according to the mass center requirement diagram, the system requires the mass center offset condition of the tank (such as Figure 5 The position of the next rectangular rib is preliminarily determined, and the bottom end of the previous rectangular rib is connected to the bottom end of the next rectangular rib. The maximum eccentric angle of the metal diaphragm flipping is determined to be the angle of the connection line of the two rectangular ribs, as shown in FIG. Figure 4 shown.

[0094] Step S5.3, determine the flip position of the metal diaphragm at the liquid cavity shell according to the flip arc lengths of the two rectangular ribs, and calculate the liquid volume value and the center of mass value according to the liquid surrounded by the liquid end of the metal diaphragm and the inner side of the liquid cavity shell, such as Figure 4 shown.

[0095] Step S5.4, compare the liquid volume value and the centroid value with the centroid offset condition of the tank required by the system. If the liquid volume value and the centroid value do not meet the set requirements, that is, exceed the set range, reselect the position of the second rectangular rib and calculate according to steps S5.2 and S5.3 until the liquid volume value and the centroid value meet the set requirements. Figure 5 shown.

[0096] Specifically, the system requires that the center of mass offset conditions of the tank include the center of mass required value, the mutation point volume value and the required value range, and the setting requirements include: the center of mass value does not exceed 80% of the center of mass required value, the difference between the liquid volume value and the mutation point volume value does not exceed 0.01V6, V6 is the total volume of the tank, and the line connecting the design value points determined based on different liquid volume values ​​and center of mass values ​​does not exceed the required value range.

[0097] Step S5.5, repeating steps S5.2 to S5.4, designing the position of each rectangular rib until the number of rectangular ribs is consistent with the number at the point where the centroid requirement changes in the centroid requirement diagram.

[0098] Embodiment 2:

[0099] The present invention also provides a design system for the eccentric control structure of a metal diaphragm tank. The design system for the eccentric control structure of a metal diaphragm tank can be realized by executing the process steps of the design method for the eccentric control structure of a metal diaphragm tank, that is, those skilled in the art can understand the design method for the eccentric control structure of a metal diaphragm tank as a preferred implementation mode of the design system for the eccentric control structure of a metal diaphragm tank.

[0100] The design system includes:

[0101] Module M1, determines the size parameters of the metal diaphragm, including the radius R of the spherical shell segment of the metal diaphragm 1 , the inclination angle θ of the cone section of the metal diaphragm, the bending radius R of the metal diaphragm 2 , the total height H of the metal diaphragm 1 , the wall thickness of the metal diaphragm t 1 ;

[0102] Module M2, according to the bending radius R of the metal diaphragm 2 and the position of the rectangular ribs, determine the width w of the rectangular ribs, and according to the wall thickness t of the metal diaphragm 1 Determine the height t of the rectangular rib 2 ;

[0103] Module M3, based on the total height H of the metal diaphragm 1 Determine the height H of the support ring 2 ;

[0104] Module M4, determines the height h of the first rectangular rib according to the relative position of the metal diaphragm and the support ring when the metal diaphragm is flipped 1 ;

[0105] Module M5 designs the positions of subsequent rectangular ribs according to the center of mass requirement diagram of the flipping process.

[0106] Those skilled in the art know that, in addition to realizing the system and its various devices, modules, and units provided by the present invention in a purely computer-readable program code, it is entirely possible to realize the same functions in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system and its various devices, modules, and units provided by the present invention can be considered as a hardware component, and the devices, modules, and units included therein for realizing various functions can also be regarded as structures within the hardware component; the devices, modules, and units for realizing various functions can also be regarded as both software modules for realizing the method and structures within the hardware component.

[0107] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A design method for an eccentric control structure of a metal diaphragm tank, characterized in that: The steps include: Step S1, determining the size parameters of the metal diaphragm, including the radius R1 of the spherical shell section of the metal diaphragm, the inclination angle θ of the cone section of the metal diaphragm, the radius R2 of the bending edge of the metal diaphragm, the total height H1 of the metal diaphragm, and the wall thickness t1 of the metal diaphragm; Step S2, determining the width w of the rectangular rib according to the bending radius R2 of the metal diaphragm and the position of the rectangular rib, and determining the height t2 of the rectangular rib according to the wall thickness t1 of the metal diaphragm; Step S3, determining the height H2 of the support ring according to the total height H1 of the metal diaphragm; Step S4, determining a height h1 of the first rectangular rib according to the relative position of the metal diaphragm and the supporting ring when the metal diaphragm is turned over; Step S5, designing the positions of subsequent rectangular ribs according to the center of mass requirement diagram of the flipping process.

2. The design method of a metal diaphragm tank eccentric control structure according to claim 1 is characterized in that: In step S1, the metal diaphragm as a whole is composed of a curved edge section, a cone section, and a spherical shell section from bottom to top, and each section is tangentially connected. The inner side of the metal diaphragm is the liquid end, and the outer side of the metal diaphragm is the gas end.

3. The design method of a metal diaphragm tank eccentric control structure according to claim 2 is characterized in that: In step S1, the radius R1 of the spherical shell segment of the metal diaphragm is calculated by the following formula: Wherein, V is the required volume of the tank; λ is the volume coefficient, and λ is 1.05 to 1.10; The inclination angle θ of the cone section of the metal diaphragm is 60 to 80°; The bending radius R2 of the metal diaphragm is 3 to 6 mm; The total height H1 of the metal diaphragm is calculated by the following formula: H1=R1+R1 sinθcosθ+R2(2) The wall thickness t1 of the metal diaphragm is obtained according to the discharge pressure difference requirement.

4. The design method of a metal diaphragm tank eccentric control structure according to claim 1 is characterized in that: In the step S2, the ribs with a rectangular cross section, i.e., the rectangular ribs, are laid on one side of the gas end of the metal diaphragm by rotating around the rotation axis of the metal diaphragm, the sides of the rectangular ribs are perpendicular to the gas end of the metal diaphragm, the connection between the rectangular ribs and the metal diaphragm is provided with a transition fillet, and the outer side of the rectangular ribs is provided with a smooth chamfer; The width w of the first rectangular rib is calculated by the following formula: w=ηR2+0.5(n-1)(3) Wherein, η is the width coefficient of the first rectangular rib, which is 1.05 to 1.2; n is the position of the rectangular ribs calculated from bottom to top of the metal diaphragm, the first rectangular rib n=1, the second rectangular rib n=2, the third rectangular rib n=3, and so on; The height t2 of the rectangular rib is calculated by the following formula: t2=μt1(4) Wherein, μ is the height coefficient of the rectangular rib, and μ is not less than 0.5; The chamfers R3 and R4 of the rectangular ribs are taken as 0.3t2.

5. The design method of the eccentric control structure of a metal diaphragm tank according to claim 4 is characterized in that: In step S2, the heights of the rectangular ribs at various positions of the metal diaphragm are the same, while the widths of the rectangular ribs close to the top of the metal diaphragm gradually increase.

6. The design method of a metal diaphragm tank eccentric control structure according to claim 1, characterized in that: In step S3, the bottom of the support ring fits with the curved edge and the tapered section of the metal diaphragm, and the height H2 of the support ring is set to 0.25H1.

7. The design method of a metal diaphragm tank eccentric control structure according to claim 1, characterized in that: In step S4, when the metal diaphragm starts to flip until the distance S between the metal diaphragm and the supporting ring's fitting side reaches at least 3t1, the top of the supporting ring corresponds to the position of the metal diaphragm, which is the starting point of the first rectangular rib, thereby determining the height h1 of the first rectangular rib.

8. The design method of a metal diaphragm tank eccentric control structure according to claim 1, characterized in that: The step S5 comprises the following sub-steps: Step S5.1, simplifying the tank centroid calculation object to the liquid surrounded by the liquid end side of the metal diaphragm and the inner side of the liquid cavity shell; Step S5.2, preliminarily determine the position of the next rectangular rib according to the mass center offset condition of the tank required by the system in the mass center requirement diagram, connect the bottom end of the previous rectangular rib with the bottom end of the next rectangular rib, and determine that the maximum eccentric angle of the metal diaphragm flipping is the angle of the connection line of the two rectangular ribs; Step S5.3, determining the flipping position of the metal diaphragm at the liquid cavity shell according to the flipping arc lengths of the two rectangular ribs, and calculating the liquid volume value and the center of mass value according to the liquid surrounded by the liquid end of the metal diaphragm and the inner side of the liquid cavity shell at this time; Step S5.4, comparing the liquid volume value and the center of mass value with the center of mass offset condition of the tank required by the system. If the liquid volume value and the center of mass value do not meet the set requirements, reselect the position of the second rectangular rib and calculate according to steps S5.2 and S5.3 until the liquid volume value and the center of mass value meet the set requirements; Step S5.5, repeating the steps S5.2 to S5.4, designing the position of each rectangular rib until the number of rectangular ribs is consistent with the number at the point where the centroid requirement changes suddenly in the centroid requirement diagram.

9. The design method of the metal diaphragm tank eccentric control structure according to claim 8, characterized in that: In step S5.4, the system requires that the center of mass offset condition of the tank include a center of mass requirement value, a mutation point volume value and a required value range, and the set requirements include: the center of mass value does not exceed 80% of the center of mass requirement value, the difference between the liquid volume value and the mutation point volume value does not exceed 0.01V6, V6 is the total volume of the tank, and the line connecting the design value points determined based on different liquid volume values ​​and center of mass values ​​does not exceed the required value range.

10. A design system for an eccentric control structure of a metal diaphragm tank, characterized in that: include: Module M1, determines the size parameters of the metal diaphragm, including the radius R1 of the spherical shell section of the metal diaphragm, the inclination angle θ of the cone section of the metal diaphragm, the radius R2 of the bending edge of the metal diaphragm, the total height H1 of the metal diaphragm, and the wall thickness t1 of the metal diaphragm; Module M2, determining the width w of the rectangular rib according to the bending radius R2 of the metal diaphragm and the position of the rectangular rib, and determining the height t2 of the rectangular rib according to the wall thickness t1 of the metal diaphragm; Module M3, determining the height H2 of the support ring according to the total height H1 of the metal diaphragm; Module M4, determining a height h1 of the first rectangular rib according to a relative position between the metal diaphragm and the supporting ring when the metal diaphragm is flipped; Module M5 designs the positions of subsequent rectangular ribs according to the center of mass requirement diagram of the flipping process.

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