Method and device for evaluating the sealing performance of a sealing structure

Abstract

The application discloses a sealing performance evaluation method and device of a sealing structure, and relates to the technical field of liquid rocket engine research, to solve the problem of poor sealing performance evaluation accuracy of the sealing structure in the prior art. The method comprises the following steps: obtaining static stress load data of a target sealing flange structure in a target liquid rocket engine; based on the static stress load data, determining wear parameters between a soft plating layer and a flange contact surface in the target sealing flange structure by using a soft plating layer friction and wear analysis model; the soft plating layer friction and wear analysis model is an analysis model obtained after at least grid ALE self-adaptation and setting of a grid node motion control mode are performed on a grid corresponding to the soft plating layer of the target sealing flange structure in a two-dimensional axisymmetric finite element model; and based on the wear parameters, evaluating the sealing performance of the target sealing flange structure; thereby the accuracy of evaluating the sealing performance of the sealing structure is improved.

Description

Technical Field

[0001] This invention relates to the field of liquid rocket engine research technology, and in particular to a method and apparatus for evaluating the sealing performance of a sealing structure. Background Technology

[0002] Because liquid rocket engines operate under high temperature and high pressure conditions, the flange sealing structures in these engines often utilize high-temperature alloy materials to withstand the high temperature and high pressure environment caused by the high-temperature exhaust gases. In existing technologies, to ensure good rebound of the seals after compression and sufficient compensation for flange deformation and separation, thin-walled or cantilevered seal structures are commonly used. However, for metal-to-metal seals, gas can escape through molecular-scale gaps. Even when the smoothest machined surfaces are in contact, only a small portion of the surface is actually in close contact, leaving numerous leakage channels. While increasing the flange stiffness and the normal load on the contact surface can improve the sealing surface contact, this does not significantly improve leakage for tiny gas molecules and instead poses a significant challenge to lightweight structural requirements.

[0003] To address the aforementioned issues, a common method involves electroplating a layer of softer metal, such as copper or silver, onto the hard high-temperature alloy substrate of the sealing element. This soft plating layer is then plastically flowed under pressure to fill gaps and defects on the contact surface, effectively achieving a reliable seal between metals. However, current methods for analyzing the sealing performance of sealing structures primarily focus on calculating the deformation of the sealing element and flange. This involves limiting the flange's deformation to within the seal's rebound and considering a certain margin to ensure sealing capability. The influence of the soft plating layer is not incorporated into the analysis, failing to account for the changes in its state due to compression, accumulation, and wear during operation. In other words, the wear rate of the soft plating layer cannot be analyzed, resulting in poor accuracy in assessing the sealing performance and service life of the sealing structure.

[0004] Therefore, there is an urgent need to design a more refined method for evaluating sealing performance in order to solve the problem of poor accuracy in evaluating the sealing performance of sealing structures in existing technologies. Summary of the Invention

[0005] The purpose of this invention is to provide a method and apparatus for evaluating the sealing performance of a sealing structure. By considering the soft contact between the soft plating layer and the hard metal in the sealing structure, the influence of the soft plating layer is incorporated into the sealing performance analysis of the sealing structure, thus obtaining the actual contact state between the sealing element and the flange, and thereby more accurately evaluating the sealing performance of the sealing structure. This solves the problem of poor accuracy in evaluating the sealing performance of sealing structures in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] In a first aspect, the present invention provides a method for evaluating the sealing performance of a sealing structure, which may include:

[0008] Acquire static stress load data of the target sealing flange structure in the target liquid rocket engine;

[0009] Based on the static stress load data, the wear parameters between the soft coating and the flange contact surface in the target sealing flange structure are determined using the soft coating friction and wear analysis model. The soft coating friction and wear analysis model is an analysis model obtained by performing at least mesh ALE adaptation and setting mesh node motion control mode on the mesh corresponding to the soft coating of the target sealing flange structure in the two-dimensional axisymmetric finite element model.

[0010] The sealing performance of the target sealing flange structure is evaluated based on the wear parameters.

[0011] Preferably, the step of determining the wear parameters between the soft coating and the flange contact surface in the target sealing flange structure based on the static stress load data and using the soft coating friction and wear analysis model may include, beforehand: constructing the soft coating friction and wear analysis model; the soft coating friction and wear analysis model is at least used to analyze the wear parameters of the soft coating on the sealing element and the rigid surface;

[0012] The construction of the friction and wear analysis model for the soft coating may include:

[0013] Obtain the cross-sectional data of the sealing element in the target sealing flange structure;

[0014] Based on the cross-sectional data of the seal, the two-dimensional axisymmetric finite element model is constructed;

[0015] By setting the first parameter of the two-dimensional axisymmetric finite element model, a friction and wear analysis model for the intermediate soft coating layer is obtained;

[0016] The soft coating friction and wear analysis model is obtained by setting the soft coating mesh in the intermediate soft coating friction and wear analysis model using ALE adaptive mesh and setting the node motion control mode of the ALE adaptive mesh.

[0017] Preferably, the step of setting the first parameter of the two-dimensional axisymmetric finite element model to obtain the friction and wear analysis model of the intermediate soft coating layer may include:

[0018] Multiple parameter setting objects are defined in the two-dimensional axisymmetric finite element model; the multiple parameter setting objects include at least a seal, a seal substrate, a soft layer, and a contact pair; the contact pair is the contact pair between the seal and the rigid surface.

[0019] Determine multiple target attributes corresponding to multiple parameter setting objects; the multiple target attributes include at least the material properties of the seal, the contact properties of the contact pair, and the elastic modulus, Poisson's ratio, and true stress / strain curves of the seal substrate and the soft coating material, respectively.

[0020] By combining the multiple target properties with the two-dimensional axisymmetric finite element model, the friction and wear analysis model of the intermediate soft coating is obtained.

[0021] Preferably, the step of setting the soft coating mesh in the intermediate soft coating friction and wear analysis model by performing ALE adaptive mesh setting and setting the node motion control mode in the ALE adaptive mesh to obtain the soft coating friction and wear analysis model may include: constructing the soft coating mesh in the intermediate soft coating friction and wear analysis model beforehand.

[0022] The construction of the soft coating mesh in the friction and wear analysis model of the intermediate soft coating may include:

[0023] The sealing geometry model of the friction and wear analysis model of the intermediate soft coating is meshed using a preset reduction integration element strategy to obtain the target mesh region; the preset reduction integration element strategy includes at least the strategy of quadrilateral axisymmetric linear reduction integration element.

[0024] Based on the target mesh region, combined with the coating region using regular quadrilateral units, the soft coating mesh is obtained.

[0025] Preferably, the step of setting the soft coating mesh in the friction and wear analysis model of the intermediate soft coating layer using ALE adaptive mesh and setting the node motion control mode in the ALE adaptive mesh may include:

[0026] Determine multiple target parameters for ALE adaptive mesh settings, wherein the multiple target parameters include at least the mesh type, frequency control parameters, intensity control parameters, and mesh movement mode for the soft coating region;

[0027] By combining multiple target parameters with the friction and wear analysis model of the intermediate soft coating, an ALE adaptive mesh is obtained in the friction and wear analysis model of the intermediate soft coating.

[0028] The method for setting multiple node motion control methods in the ALE adaptive mesh is determined. These multiple node motion control methods include at least the following: a control method for acquiring data information of each node in the moving node set; a control method for acquiring node coordinate information; a control method for acquiring a series of cells connected to the node; a control method for acquiring node characteristic variables; a control method for adjusting mesh density based on wear conditions; and a cumulative data writing control method. Among these, the node characteristic variables include at least the node's normal and tangential contact stress, tangential sliding distance, and normal separation displacement.

[0029] The multiple node motion control methods are combined with the ALE adaptive mesh in the intermediate soft coating friction and wear analysis model to obtain the soft coating friction and wear analysis model.

[0030] Preferably, the process of acquiring the static stress load data of the target sealing flange structure in the target liquid rocket engine may include, prior to:

[0031] Construct a three-dimensional static stress analysis model;

[0032] Obtain transient thermal cycle load data of the target sealing flange structure;

[0033] Based on the transient thermal cycle load data, the working process of the target liquid rocket engine is simulated and calculated using the three-dimensional static stress analysis model to obtain the static stress load data of the target sealing flange structure.

[0034] Preferably, the construction of the three-dimensional static stress analysis model may include:

[0035] The mesh type in the three-dimensional transient heat conduction analysis model is changed from the three-dimensional heat transfer element mesh type to the stress element mesh type to obtain an intermediate three-dimensional static stress analysis model; the stress element mesh type is used to read the transient thermal cycle load data of the start-up and shutdown cooling processes obtained by the transient heat conduction analysis according to the node number in the three-dimensional transient heat conduction analysis model;

[0036] According to the preset parameter setting rules, the parameters of the intermediate three-dimensional static stress analysis model are set to obtain the three-dimensional static stress analysis model; the preset parameter setting rules include at least setting the material strength properties of the sealing flange structure in the intermediate three-dimensional static stress analysis model, setting the contact properties of the contact pair and the contact pair, setting the flange boundary, and setting the three-dimensional static stress analysis steps.

[0037] Preferably, before acquiring the transient thermal cycle load data of the target sealing flange structure, the process may include: constructing a three-dimensional transient heat conduction analysis model;

[0038] Based on the operating parameters of the target liquid rocket engine, the heat transfer analysis of the target sealing flange structure is performed using the three-dimensional transient heat conduction analysis model to obtain the transient thermal cycle load data.

[0039] Preferably, the construction of the three-dimensional transient heat conduction analysis model may include:

[0040] A periodic symmetric model of the sealing flange structure is constructed. The sealing flange structure includes at least a flange, fasteners, and sealing components. The periodic symmetric model of the sealing flange structure includes at least one sector region of a bolt. The sector region is used to conduct transient heat conduction analysis during the working heating process and the shutdown cooling process.

[0041] Based on the target parameters, the periodic symmetric model of the sealing flange structure is meshed according to a preset mesh type to obtain an intermediate three-dimensional transient heat conduction analysis model; the preset mesh type includes at least a three-dimensional heat transfer unit mesh type; the target parameters include at least one of the following: elastic modulus, Poisson's ratio, coefficient of thermal expansion, and thermal conductivity of the flange, fastener, and sealing material as a function of temperature.

[0042] Based on the preset rules for setting loads and boundaries in transient heat transfer analysis, the intermediate three-dimensional transient heat conduction analysis model is parameter-set to obtain the three-dimensional transient heat conduction analysis model; the preset rules for setting loads and boundaries in transient heat transfer analysis include load and boundary setting rules for the heating process and load and boundary setting rules for the cooling process.

[0043] In a second aspect, the present invention provides a device for determining the sealing performance of a sealing structure, which may include:

[0044] The data acquisition module is used to acquire static stress load data of the target sealing flange structure in the target liquid rocket engine;

[0045] The wear parameter determination module is used to determine the wear parameters between the soft coating and the flange contact surface in the target sealing flange structure based on the static stress load data and using a soft coating friction and wear analysis model. The soft coating friction and wear analysis model is an analysis model obtained by performing at least mesh ALE adaptation and setting mesh node motion control mode on the mesh corresponding to the soft coating of the target sealing flange structure in the two-dimensional axisymmetric finite element model.

[0046] A sealing performance evaluation module is used to evaluate the sealing performance of the target sealing flange structure based on the wear parameters.

[0047] Compared with existing technologies, this invention provides a method for evaluating the sealing performance of a sealing structure. This method involves acquiring static stress load data of a target sealing flange structure in a target liquid rocket engine. Based on this static stress load data, a soft-coating friction and wear analysis model is used to determine the wear parameters between the soft coating and the flange contact surface in the target sealing flange structure. The soft-coating friction and wear analysis model is an analysis model obtained by performing at least mesh ALE adaptation and setting mesh node motion control methods on the mesh corresponding to the soft coating of the target sealing flange structure in a two-dimensional axisymmetric finite element model. Finally, the sealing performance of the target sealing flange structure is evaluated based on the wear parameters. Therefore, this invention incorporates the influence of the soft coating into the sealing performance analysis using a soft-coating friction and wear analysis model. This allows for the acquisition of the state changes of the soft coating during operation due to compression, accumulation, and wear, and outputs the wear parameters between the soft coating and the flange contact surface. This provides a more accurate assessment of the contact state between the sealing ring and the flange, improving the accuracy of evaluating the sealing performance of the sealing structure. Attached Figure Description

[0048] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0049] Figure 1 A schematic diagram of the main process of a sealing performance evaluation method for a sealing structure provided by the present invention;

[0050] Figure 2 A schematic diagram of the main process for constructing a friction and wear analysis model for a soft coating layer in a sealing performance evaluation method for a sealing structure provided by the present invention;

[0051] Figure 3 A schematic diagram of the main process for constructing a three-dimensional static stress analysis model in a sealing performance evaluation method for a sealing structure provided by the present invention;

[0052] Figure 4 A schematic diagram of the main process for constructing a three-dimensional transient heat conduction analysis model in a sealing performance evaluation method for a sealing structure provided by the present invention;

[0053] Figure 5 This is a schematic diagram of a sealing performance evaluation device for a sealing structure provided by the present invention. Detailed Implementation

[0054] To facilitate a clear description of the technical solutions in the embodiments of the present invention, the terms "first" and "second" are used to distinguish identical or similar items with essentially the same function and effect. For example, the first threshold and the second threshold are merely used to distinguish different thresholds and do not limit their order. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and the terms "first" and "second" are not necessarily different.

[0055] It should be noted that in this invention, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0056] In this invention, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding related objects have an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, a combination of a and b, a combination of a and c, a combination of b and c, or a, b, and c, where a, b, and c can be single or multiple.

[0057] In existing technologies, the sealing performance analysis of flange sealing structures mainly characterizes their sealing capacity through the contact performance and resilience of the sealing ring. Current analytical methods primarily calculate the deformation of the sealing ring and flange, ensuring sealing capacity only by limiting the flange deformation separation to within the rebound compensation of the sealing ring and considering a certain margin. However, the influence of the soft coating is not incorporated into the analysis. Therefore, the changes in the state of the soft coating due to compression, accumulation, and wear during operation cannot be considered. This results in inaccurate contact state between the sealing ring and flange in the contact performance analysis of the sealing structure, failing to provide true contact pressure and contact area. Consequently, there is a lack of characterization of the wear rate of the soft coating, making it impossible to accurately assess the sealing performance and service life of the sealing structure.

[0058] Based on this, the present invention provides a method and apparatus for evaluating the sealing performance of a sealing structure. It considers the soft contact between the soft plating layer and the hard metal in the sealing structure, incorporates the influence of the soft plating layer into the sealing performance analysis of the sealing structure, obtains the actual contact state between the sealing element and the flange, and can more accurately evaluate the sealing performance of the sealing structure; thus solving the problem of poor accuracy in evaluating the sealing performance of sealing structures in the prior art.

[0059] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings:

[0060] Please see Figure 1 , Figure 1 This is a schematic diagram of the main process of a sealing performance evaluation method for a sealing structure provided by the present invention. The execution subject of the method is a server or service terminal equipped with the sealing performance evaluation method for the sealing structure provided by the present invention, such as a sealing performance evaluation platform or a small sealing performance evaluation device. It should be noted that there are various types of sealing flange structures in liquid rocket engines. For different types of sealing flange structures, as long as there is a correspondence between the sealing element and the flange surface, the sealing performance can be evaluated using the method provided by the present invention.

[0061] exist Figure 1 In this context, the method may include:

[0062] Step 110: Obtain static stress load data of the target sealing flange structure in the target liquid rocket engine.

[0063] In step 110, the static stress load data may include at least the compression and / or rebound history load data of the target sealing structure during use; the use process of the target sealing structure in the liquid engine is: applying bolt preload → applying gas pressure → loading the temperature field during startup and operation → removing gas pressure load → loading the temperature field during shutdown and reheating; therefore, the compression and / or rebound history load data is the compression and / or rebound history load data experienced by the sealing structure during the complete operation of the liquid rocket engine.

[0064] Step 120: Based on the static stress load data, use the soft coating friction and wear analysis model to determine the wear parameters between the soft coating and the flange contact surface in the target sealing flange structure; the soft coating friction and wear analysis model is an analysis model obtained by performing at least mesh ALE adaptation and setting the mesh node motion control mode on the mesh corresponding to the soft coating of the target sealing flange structure in the two-dimensional axisymmetric finite element model.

[0065] Step 130: Evaluate the sealing performance of the target sealing flange structure based on the wear parameters.

[0066] In steps 120 to 130, the friction and wear analysis model of the soft coating is the analysis model obtained by performing at least mesh ALE adaptation and setting the mesh node motion control mode on the mesh corresponding to the soft coating of the target sealing flange structure in the two-dimensional axisymmetric finite element model. For example, it can be based on the sealing-rigid surface contact wear analysis model to establish the soft metal coating, further consider the force and heat load of the sealing component during assembly and operation, as well as the actual contact wear mechanical behavior of the coating, so as to obtain the friction and wear analysis model of the soft coating, which can calculate and analyze the wear history of the soft metal coating during use.

[0067] By employing a friction and wear analysis model for soft-coating layers, the wear parameters between the soft-coating layer and the flange contact surface in the target sealing flange structure are determined. These wear parameters include at least the contact area, contact pressure, contact force, and wear depth. The sealing performance of the target sealing flange structure can then be evaluated using the wear parameters output by the soft-coating friction and wear analysis model. For example, based on the plastic deformation theory of micro-protrusions on the contact surface, assuming that the wear amount is related to the contact pressure, sliding distance, and material hardness, the wear amount of the sealing structure can be calculated, thereby obtaining the sealing performance of the target sealing flange structure.

[0068] Based on this, the present invention provides a method for evaluating the sealing performance of a sealing structure. This method acquires static stress load data of the target sealing flange structure in a target liquid rocket engine. Based on this static stress load data, a soft coating friction and wear analysis model is used to determine the wear parameters between the soft coating and the flange contact surface in the target sealing flange structure. Based on these wear parameters, the sealing performance of the target sealing flange structure is evaluated. This method incorporates the influence of the soft coating into the sealing performance analysis using a soft coating friction and wear analysis model, obtaining the state changes of the soft coating during operation due to compression, accumulation, and wear consumption. The wear parameters between the soft coating and the flange contact surface are output, allowing for a more accurate assessment of the contact state between the sealing ring and the flange, thus improving the accuracy of evaluating the sealing performance of the sealing structure.

[0069] Preferably, before step 120, i.e., based on static stress load data, the wear parameters between the soft coating and the flange contact surface in the target sealing flange structure are determined using a soft coating friction and wear analysis model. This may include: constructing a soft coating friction and wear analysis model; the soft coating friction and wear analysis model is at least used to analyze the wear parameters of the soft coating on the sealing element and the rigid surface.

[0070] Specifically, for constructing a friction and wear analysis model for soft coatings, please refer to [reference needed]. Figure 2 , Figure 2 This is a schematic diagram of the main process for constructing a friction and wear analysis model for a soft coating in a sealing performance evaluation method for a sealing structure provided by the present invention.

[0071] exist Figure 2 In this context, methods for constructing tribological analysis models for soft coatings can include:

[0072] Step 210: Obtain the cross-sectional data of the seal in the target sealing flange structure.

[0073] Step 220: Based on the cross-sectional data of the seal, construct the two-dimensional axisymmetric finite element model.

[0074] In steps 210 to 220, the cross-sectional data of the sealing element can be obtained by extracting the cross-section of the sealing element in the standard sealing flange structure. Based on the cross-sectional data, a two-dimensional axisymmetric finite element model is established, that is, a two-dimensional axisymmetric finite element model that includes the sealing element and the rigid surface. In this model, the sealing element is compressed by a pair of rigid surfaces. Along the sealing lip contour line, a strip-shaped area with a width equal to the coating thickness is cut out in the area where it may come into contact with the rigid surface.

[0075] Step 230: Set the first parameter of the two-dimensional axisymmetric finite element model to obtain the friction and wear analysis model of the intermediate soft coating.

[0076] Step 240: Perform ALE adaptive mesh setting and set the node motion control mode of the ALE adaptive mesh in the soft coating friction and wear analysis model to obtain the soft coating friction and wear analysis model.

[0077] In steps 230 to 240, the first parameter in the two-dimensional axisymmetric finite element model can be set to obtain the friction and wear analysis model of the intermediate soft coating. For example, the material data of the seal, the elastic modulus of the sealing ring substrate and the coating material can be set. Then, the soft coating mesh in the intermediate soft coating friction and wear analysis model is further configured with ALE adaptive mesh and the node motion control mode of ALE adaptive mesh is set to obtain the soft coating friction and wear analysis model used to determine the wear parameters between the soft coating and the flange contact surface in the target sealing flange structure. The ALE adaptive mesh setting can be completed using existing methods. For example, the ALE adaptive mesh setting can be set in the "Analysis Step" module of the ABAQUS / Standard software interface to select the mesh of the soft metal coating area.

[0078] Preferably, in step 230, setting the first parameters of the two-dimensional axisymmetric finite element model to obtain the friction and wear analysis model of the intermediate soft coating can include: first, determining multiple parameter setting objects in the two-dimensional axisymmetric finite element model; the multiple parameter setting objects include at least a seal, a seal substrate, a soft layer, and a contact pair; the contact pair is the contact pair between the seal and the rigid surface; then, determining multiple target attributes corresponding to the multiple parameter setting objects; the multiple target attributes include at least the material properties of the seal, the contact properties of the contact pair, and the elastic modulus, Poisson's ratio, and true stress / strain curves of the seal substrate and the soft coating material; finally, combining the multiple target attributes with the two-dimensional axisymmetric finite element model to obtain the friction and wear analysis model of the intermediate soft coating.

[0079] Specifically, in the contact pair set between the seal and the rigid surface, the rigid surface can be set as the main contact surface, the sealing lip and sealing ring limiting surface can be set as the secondary contact surface, the slip equation can be set as "finite slip", and the discretization method can be set as "node-to-face", etc.

[0080] Preferably, before step 240, i.e., before setting the soft coating mesh in the intermediate soft coating friction and wear analysis model by ALE adaptive mesh setting and setting the node motion control mode in the ALE adaptive mesh to obtain the soft coating friction and wear analysis model, the preceding steps may include: constructing the soft coating mesh in the intermediate soft coating friction and wear analysis model.

[0081] Specifically, constructing the soft coating mesh in the friction and wear analysis model of the intermediate soft coating can include: using a preset reduction integration element strategy to mesh the sealing geometric model of the intermediate soft coating friction and wear analysis model to obtain the target mesh region; the preset reduction integration element strategy includes at least the strategy of quadrilateral axisymmetric linear reduction integration elements; based on the target mesh region, combined with the coating region using regular quadrilateral elements, the soft coating mesh is obtained.

[0082] For example, quadrilateral axisymmetric linear reduced integral elements can be used to mesh the geometric model of the sealing ring, and regular quadrilateral elements can be used in the coating area to obtain the soft (metallic) coating mesh.

[0083] Preferably, in step 240, setting the soft coating mesh in the intermediate soft coating friction and wear analysis model using ALE adaptive mesh and setting the node motion control method in the ALE adaptive mesh may include S1 to S4:

[0084] S1: First, determine several target parameters for ALE adaptive mesh settings. These target parameters include at least the mesh type, frequency control parameters, intensity control parameters, and mesh movement mode for the soft coating region.

[0085] S2: Combine multiple target parameters with the friction and wear analysis model of the intermediate soft coating to obtain the ALE adaptive mesh in the friction and wear analysis model of the intermediate soft coating.

[0086] Specifically, S1 determines several target parameters for ALE adaptive mesh settings, such as: determining the mesh type of the soft coating region as a soft (metallic) coating region mesh; determining the value of m corresponding to the frequency control parameter, which defines the mesh update frequency in a single analysis step; the smaller the m value, the higher the mesh update frequency; in the soft coating friction and wear analysis model, m is set to 1; determining the intensity control parameter n, which represents the number of times a new mesh is generated according to the defined mesh smoothing algorithm in each mesh update; in the soft coating friction and wear analysis model, n is set to 2; and determining the mesh movement mode as user-defined. Further, S2 combines these multiple target parameters with the intermediate soft coating friction and wear analysis model, thereby obtaining the ALE adaptive mesh located in the intermediate soft coating friction and wear analysis model.

[0087] As an example, if ABAQUS / Standard software is used to perform ALE adaptive meshing on the soft metal coating mesh, the ALE adaptive meshing is completed after combining multiple target parameters with the intermediate soft coating friction and wear analysis model. Specifically, in the "Analysis Step" module of the ABAQUS / Standard software interface, the ALE adaptive mesh domain set under the path Other→ALE Adaptive Mesh Domain defines the mesh of the soft metal coating region in the Region field; the frequency control parameter at Frequency is m; and the intensity control parameter at Remeshing sweeps per increment is n. When setting ALE adaptive mesh constraints for the soft metal coating mesh, the corresponding path Other→ALE Adaptive Mesh Constraint in the Step module determines the moving node set and node movement type. The mesh movement mode in the soft coating friction and wear analysis model is user-defined.

[0088] S3: Determine the motion control methods for multiple nodes in the ALE adaptive mesh. The multiple node motion control methods may include at least the control methods for acquiring data information of each node in the moving node set, the control methods for acquiring node coordinate information, the control methods for acquiring a series of cells connected to the node, the control methods for acquiring the node's characteristic variables, the control methods for adjusting the mesh density based on wear conditions, and the cumulative data writing control methods. Among them, the node's characteristic variables may include at least the node's normal and tangential contact stress, tangential sliding distance, and normal separation displacement.

[0089] S4: Combine the motion control methods of multiple nodes with the ALE adaptive mesh in the friction and wear analysis model of the intermediate soft coating to obtain the friction and wear analysis model of the soft coating.

[0090] Specifically, S3 can be used to determine the motion control methods for multiple nodes in the ALE adaptive mesh, including but not limited to: how to obtain the data information of each node in the moving node set, how to obtain the node coordinate information, how to obtain the control methods of a series of cells connected to the node, how to obtain the node's characteristic variables, how to adjust the mesh density based on the wear condition, and how to accumulate data and write it into the mesh. Then, S4 combines the multiple node motion control methods with the ALE adaptive mesh in the intermediate soft coating friction and wear analysis model to obtain the soft coating friction and wear analysis model.

[0091] As an example, the Umeshmotion subroutine can be used to call the ABAQUS software's built-in applications GETVRN, GETNODETOELEMCONN, and GETVRMAVGATNODE to obtain data information for each node in the moving node set, providing input for the Archard wear model. Combined with material parameters such as the coating's hardness and wear coefficient, the wear amount of the soft coating under each contact state can be calculated.

[0092] The Umeshmotion subroutine is used to call the application's GETVRN control method at the end of each increment step to obtain node coordinate information.

[0093] The Umeshmotion subroutine is used to call the application GETNODETOELEMCONN at the end of each increment step to obtain a series of units connected to the node.

[0094] The control method of calling the application GETVRMAVGATNODE at the end of each incremental step using the Umeshmotion subroutine is adopted to obtain characteristic variables such as normal and tangential contact stress, tangential sliding distance and normal separation displacement of the node.

[0095] The wear depth increment of each node is calculated using the Archard model, and the wear depth increment is converted into the normal displacement increment to update the node coordinates, thereby realizing the dynamic evolution of the geometric morphology.

[0096] The mesh is re-divided using a triggered ALE method, and the mesh density is adjusted according to the wear condition.

[0097] The cumulative wear depth, node coordinates, contact stress, sliding distance, etc. are written into the state variable array for use in the next incremental step.

[0098] Of course, the model also needs to be configured with output settings. The model output should include at least the wear parameters used to determine the wear state, such as the contact area, contact pressure, contact force, and wear depth between the soft metal coating and the flange contact surface. Thus, based on the static stress load data of the target sealing flange structure, the wear parameters between the soft coating and the flange contact surface in the target sealing flange structure can be determined using the soft coating friction and wear analysis model.

[0099] Based on this, the soft coating friction and wear analysis model constructed in this invention, by building a soft metal coating within a sealing-rigid surface contact wear analysis model, and considering the actual force-thermal load and the actual contact wear mechanical behavior of the coating during sealing assembly and operation, can calculate and analyze the wear history of the soft metal coating during use, and obtain the actual sealing characteristics of the sealing structure. Simultaneously, a sealing-rigid surface contact wear analysis model can be established using ABAQUS software, and the Umeshmotion subroutine can be used to control the movement of mesh nodes to simulate the wear of the soft metal coating during operation; based on the Archard wear model, the wear degree of the soft metal coating during the loading process is calculated; and mesh reconstruction is performed using ALE (Arbitrary Lagrangian Eulerian) adaptive meshing technology, solving the problems of soft metal coating wear consumption and mesh distortion caused by plastic flow, realizing the introduction of the coating wear process into the numerical calculation of contact characteristics (contact area, contact pressure, contact resultant force, wear depth, etc.), forming a numerical calculation method (wear parameter) for the contact and wear mechanical behavior of the "soft coating-hard alloy" system; thereby improving the accuracy of evaluating the sealing performance of the sealing structure.

[0100] It should be noted that the Archard wear model is based on the theory of plastic deformation of micro-protrusions on the contact surface, assuming that the amount of wear is related to the contact pressure, sliding distance, and material hardness, and can be expressed by the following formula:

[0101] (1)

[0102] Calculate the contact wear amount; where, For wear amount, For normal load, and for sliding distance, For hardness, The wear coefficient is denoted as .

[0103] It should be noted that S1 to S4 can be completed independently by a computer, or in specific application scenarios, they can be completed manually. The specific requirements can be determined according to actual needs, and no specific limitations are made in this invention.

[0104] Preferably, before step 110, i.e. before obtaining the static stress load data of the target sealing flange structure in the target liquid rocket engine, steps S5 to S7 may be included:

[0105] S5: Construct a three-dimensional static stress analysis model.

[0106] S6: Obtain transient thermal cycle load data of the target sealing flange structure.

[0107] S7: Based on transient thermal cycle load data, the working process of the target liquid rocket engine is simulated and calculated using a three-dimensional static stress analysis model to obtain the static stress load data of the target sealing flange structure.

[0108] In S5 to S7, the constructed three-dimensional static stress analysis model can be used for static stress analysis of seals, flanges, and fasteners. The transient thermal cycle load data of the target sealing flange structure is obtained by combining the three-dimensional transient heat conduction analysis model with heat transfer analysis based on engine operating parameters, and the thermal cycle load data experienced by the sealing ring structure during service. The complete working process of the target liquid rocket engine is: applying bolt preload → applying gas pressure → loading the temperature field during startup and operation → removing gas pressure load → loading the temperature field during shutdown and reheating. Based on this, the static stress load data of the target sealing flange structure during the working process of the target liquid rocket engine can be obtained.

[0109] For details on how to construct a three-dimensional static stress analysis model, please refer to [link / reference]. Figure 3 , Figure 3 This is a schematic diagram of the main process for constructing a three-dimensional static stress analysis model in a sealing performance evaluation method for a sealing structure provided by the present invention.

[0110] exist Figure 3 In this context, methods for constructing a three-dimensional static stress analysis model may include:

[0111] Step 310: Modify the mesh type in the three-dimensional transient heat conduction analysis model from the three-dimensional heat transfer element mesh type to the stress element mesh type to obtain the intermediate three-dimensional static stress analysis model; the stress element mesh type is used to read the transient thermal cycle load data of the start-up and shutdown cooling processes obtained by the transient heat conduction analysis according to the node number in the three-dimensional transient heat conduction analysis model.

[0112] Step 320: Set the parameters of the intermediate three-dimensional static stress analysis model according to the preset parameter setting rules to obtain the three-dimensional static stress analysis model; the preset parameter setting rules include at least setting the material strength properties of the sealing flange structure in the intermediate three-dimensional static stress analysis model, setting the contact properties of the contact pair and the contact pair, setting the flange boundary, and setting the three-dimensional static stress analysis steps.

[0113] In steps 310 to 320, a finite element mesh that is completely consistent with the three-dimensional transient heat conduction analysis model can be used first, only the mesh type is changed from heat transfer element to stress element, so that the transient temperature field of the start-up and shutdown cooling processes obtained by the transient heat conduction analysis can be read in according to the node number.

[0114] Then, material strength properties are set for the seal (ring), flange, and fastener respectively; the sealing ring is described by both nonlinear kinematic hardening and saturated isotropic hardening models, while the flange and fastener are described by linear kinematic hardening models.

[0115] Furthermore, contact pairs are set between the sealing ring and the flange sealing ring groove, between the mating surfaces of the upper and lower flanges, between the bolts and the bolt hole walls, between the bolts and the gaskets, and between the gaskets and the upper flange. Among these, the contact properties of the contact pair between the sealing ring and the flange ring groove can be set as follows: the sealing ring is the secondary contact surface, the flange ring groove is the primary contact surface, the slip equation is selected as "finite slip," the discretization method is selected as "node opposite," and the discretization method is selected as "face to face."

[0116] Finally, based on the stiffness of the actual pipeline system where the flange is located, the flange boundary is set, and a periodic symmetrical boundary is applied. Five analysis steps are set up to apply the following load history: applying bolt preload → applying gas pressure → loading the temperature field during start-up and operation → removing the gas pressure load → loading the temperature field during shutdown and recovery. This allows us to obtain the variation law of the contact force between the sealing ring and the flange during the compression-springback process, as well as the radial slippage of the contact point between the sealing ring and the flange. Among them, the temperature fields during start-up and operation and the temperature fields during shutdown and recovery can be obtained using a three-dimensional transient heat conduction analysis model.

[0117] Based on this, a three-dimensional (seal-flange-fastener) static stress analysis model can be obtained. Using this static stress analysis model, based on the complete load history of the engine during operation, data on the compression and rebound history of the seal during use can be obtained.

[0118] Preferably, before S6, i.e. before acquiring the transient thermal cycling load data of the target sealing flange structure, S8 to S9 may be included:

[0119] S8: Construct a three-dimensional transient heat conduction analysis model.

[0120] S9: Based on the operating parameters of the target liquid rocket engine, a three-dimensional transient heat conduction analysis model is used to perform heat transfer analysis on the target sealing flange structure and obtain transient thermal cycle load data.

[0121] In S8 to S9, based on the constructed three-dimensional transient heat conduction analysis model (seal-flange-fastener transient heat conduction analysis model), heat transfer analysis can be carried out based on engine operating parameters to obtain transient thermal cycle load data experienced by the sealing ring structure during service; this provides input for the three-dimensional static stress analysis model, thereby obtaining the static stress load data of the target sealing flange structure in the liquid rocket engine required by this invention, that is, the compression-springback process experienced by the seal during use.

[0122] For instructions on how to construct a three-dimensional transient heat conduction analysis model, please refer to [link / reference]. Figure 4 , Figure 4 This is a schematic diagram of the main process for constructing a three-dimensional transient heat conduction analysis model in a sealing performance evaluation method for a sealing structure provided by the present invention.

[0123] exist Figure 4 In this context, methods for constructing a three-dimensional transient heat conduction analysis model may include:

[0124] Step 410: Construct a periodic symmetric model of the sealing flange structure, wherein the sealing flange structure includes at least a flange, fasteners, and sealing components; the periodic symmetric model of the sealing flange structure includes at least one sector region of a bolt, wherein the sector region is used to conduct transient heat conduction analysis during the working heating process and the shutdown cooling process.

[0125] Step 420: Based on the target parameters, the periodic symmetric model of the sealing flange structure is meshed according to the preset mesh type to obtain an intermediate three-dimensional transient heat conduction analysis model; the preset mesh type includes at least a three-dimensional heat transfer unit mesh type; the target parameters include at least one of the following: elastic modulus, Poisson's ratio, coefficient of thermal expansion, and thermal conductivity of the flange, fastener, and sealing material as a function of temperature.

[0126] Step 430: Based on the preset rules for setting loads and boundaries in transient heat transfer analysis, set the parameters of the intermediate three-dimensional transient heat conduction analysis model to obtain the three-dimensional transient heat conduction analysis model; the preset rules for setting loads and boundaries in transient heat transfer analysis include load and boundary setting rules for the heating process and load and boundary setting rules for the cooling process.

[0127] In steps 410 to 430, it is first necessary to construct a periodic symmetric model of the sealing flange structure, that is, a periodic symmetric model including at least the flange, fasteners and seals. The model is characterized by including a sector region of a bolt, so that the model can be used to carry out transient heat conduction analysis during the working heating process and the shutdown cooling process.

[0128] Furthermore, based on the target parameters, the structure in the model is meshed. The mesh type can be set as a three-dimensional heat transfer element. The target parameters include at least one of the following: elastic modulus, Poisson's ratio, coefficient of thermal expansion, and thermal conductivity of the material corresponding to the flange, fastener, and seal as a function of temperature.

[0129] Finally, the loads and boundaries for the heating process in the transient heat conduction analysis are set as follows: the initial structural temperature is the ambient operating temperature; the inner surface of the flange that is in direct contact with the oxygen-rich combustion gas is set as a convective heat transfer boundary; contact heat conduction is set between each component; the outer surface of the flange that is in direct contact with the air is set as a convective heat transfer boundary and a radiation boundary; the analysis duration is 500s, the engine's single operating time. The loads and boundaries for the cooling process in the transient heat conduction analysis are also set as follows: the initial structural temperature is the temperature field at the engine shutdown moment, i.e., the temperature field obtained from the 500s transient heat conduction analysis; the inner surface of the flange that is in direct contact with the ambient air is set as a convective heat transfer boundary; contact heat conduction is set between each component; the outer surface of the flange that is in direct contact with the air is set as a convective heat transfer boundary and a radiation boundary; the analysis duration is 3 hours, the engine's average reheat time.

[0130] Based on this, the three-dimensional transient heat conduction analysis model of the present invention is obtained. Using this three-dimensional transient heat conduction analysis model, heat transfer analysis can be carried out based on engine operating parameters to obtain the temperature field of the structure during the heating and cooling processes, that is, to obtain the thermal cycle load experienced by the sealing ring structure during service.

[0131] In summary, the sealing performance evaluation method for a sealing structure provided by this invention obtains wear parameters that consider the contact and wear mechanics of the "soft coating-hard alloy" system by using three-dimensional static stress load data of the target sealing flange structure during service and incorporating a soft coating friction and wear analysis model that considers the mechanical properties and wear rate of the soft coating. Because the three-dimensional static stress load data is based on a three-dimensional static stress analysis model, which is not the same analysis model as the soft coating friction and wear analysis model, it avoids the problem of significant scale differences between the sealing coating and the flange structure, which would prevent them from being included in the same model. At the same time, it characterizes the performance of the sealing ring coating and the boundary load properties of the sealing, flange, and fastener connection structure. Furthermore, during rocket engine operation, the seal slides radially along the flange under the action of medium pressure and high temperature expansion, and the soft coating will also wear and be consumed. If the wear of the soft coating is not considered, the evaluated sealing performance will be inaccurate.

[0132] In practical applications, under the action of assembly clamping force, the soft metal plated on the surface of the sealing high-temperature alloy substrate comes into full contact with the high-temperature alloy of the sealing channel to fill gaps and defects. This process is accompanied by the plastic flow of the soft metal, which leads to mesh distortion and makes it difficult for the simulation model that does not consider the softness layer to converge. This invention does not have this problem. Therefore, the present invention provides a method for evaluating the sealing performance of a sealing structure. This method first constructs a three-dimensional transient heat conduction analysis model and a three-dimensional static stress analysis model. Through transient heat transfer analysis and quasi-static stress analysis, it sequentially obtains the thermal cycling and compression rebound processes experienced by the sealing structure during service, constructing static stress load data (mechanical-thermal cycle load) for the sealing component during service. Then, it applies the above mechanical-thermal cycle load using a simplified two-dimensional sealing ring and rigid surface model, constructing a soft metal coating on the sealing ring. A characterization model for the mechanical properties and wear rate of the coating is introduced. By continuously reconstructing the mesh, the mesh distortion problem caused by large plastic deformation of the coating is solved, forming a method for determining wear parameters that considers the contact and wear mechanical behavior of the "soft coating-hard alloy" system. This achieves the inclusion of the soft coating's influence in the sealing performance analysis using a soft coating friction and wear analysis model, obtaining the state changes of the soft coating during operation due to extrusion, accumulation, and wear consumption. It outputs the wear parameters between the soft coating and the flange contact surface, enabling a more accurate assessment of the contact state between the sealing ring and the flange, thus improving the accuracy of evaluating the sealing performance of the sealing structure.

[0133] Secondly, the present invention provides a sealing performance evaluation device for a sealing structure; please refer to [link to relevant documentation]. Figure 5 , Figure 5 This is a schematic diagram of a sealing performance evaluation device for a sealing structure provided by the present invention.

[0134] exist Figure 5 In this context, the device may include:

[0135] The data acquisition module 510 is used to acquire static stress load data of the target sealing flange structure in the target liquid rocket engine.

[0136] The wear parameter determination module 520 is used to determine the wear parameters between the soft coating and the flange contact surface in the target sealing flange structure based on the static stress load data and using the soft coating friction and wear analysis model; the soft coating friction and wear analysis model is an analysis model obtained by performing at least mesh ALE adaptation and setting the mesh node motion control mode on the mesh corresponding to the soft coating of the target sealing flange structure in the two-dimensional axisymmetric finite element model.

[0137] The sealing performance evaluation module 530 is used to evaluate the sealing performance of the target sealing flange structure based on the wear parameters.

[0138] Based on this, the present invention provides a sealing performance evaluation device for a sealing structure. First, a data acquisition module 510 acquires static stress load data of the target sealing flange structure in a target liquid rocket engine. Then, a wear parameter determination module 520, based on the static stress load data, uses a soft coating friction and wear analysis model to determine the wear parameters between the soft coating and the flange contact surface in the target sealing flange structure. The soft coating friction and wear analysis model is an analysis model obtained by performing at least mesh ALE adaptation and setting mesh node motion control methods on the mesh corresponding to the soft coating of the target sealing flange structure in a two-dimensional axisymmetric finite element model. Finally, a sealing performance evaluation module 530 evaluates the sealing performance of the target sealing flange structure based on the wear parameters. This incorporates the influence of the soft coating into the sealing performance analysis, obtaining the state changes of the soft coating during operation due to compression, accumulation, and wear, and outputting the wear parameters between the soft coating and the flange contact surface. This allows for a more accurate evaluation of the contact state between the sealing ring and the flange, improving the accuracy of evaluating the sealing performance of the sealing structure.

[0139] Although the invention has been described herein in conjunction with various embodiments, those skilled in the art will understand and implement other variations of the disclosed embodiments by reviewing the accompanying drawings, the disclosure, and the appended claims in carrying out the claimed invention. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality. A single processor or other unit can implement several functions listed in the claims. While different dependent claims may recite certain measures, this does not mean that these measures cannot be combined to produce good results.

[0140] Although the invention has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made therein without departing from the spirit and scope of the invention. Accordingly, this specification and drawings are merely exemplary descriptions of the invention as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. Clearly, those skilled in the art can make various alterations and modifications to the invention without departing from its spirit and scope. Thus, if such modifications and modifications of the invention fall within the scope of the claims and their equivalents, the invention is also intended to include such modifications and modifications.

Claims

1. A method for evaluating the sealing performance of a sealing structure, characterized in that, include: Acquire static stress load data of the target sealing flange structure in the target liquid rocket engine; Based on the static stress load data, the wear parameters between the soft coating and the flange contact surface in the target sealing flange structure are determined using a soft coating friction and wear analysis model. This process, based on the static stress load data and the soft coating friction and wear analysis model, includes: constructing the soft coating friction and wear analysis model; the soft coating friction and wear analysis model is used at least to analyze the wear parameters of the soft coating on the sealing element and the rigid surface; constructing the soft coating friction and wear analysis model includes: acquiring the cross-sectional data of the sealing element in the target sealing flange structure; constructing a two-dimensional axisymmetric finite element model based on the cross-sectional data of the sealing element; setting the first parameter of the two-dimensional axisymmetric finite element model to obtain an intermediate soft coating friction and wear analysis model; determining multiple target parameters for ALE adaptive mesh setting, wherein the multiple target parameters at least include the mesh type of the soft coating region. The model includes frequency control parameters, intensity control parameters, and mesh movement methods. Multiple target parameters are combined with the intermediate soft coating friction and wear analysis model to obtain an ALE adaptive mesh within the model. Multiple node movement control methods are determined for setting the ALE adaptive mesh. These methods include at least: acquiring data information of each node within the moving node set; acquiring node coordinate information; acquiring a series of elements connected to the node; acquiring node characteristic variables; adjusting mesh density based on wear conditions; and cumulative data writing. The node characteristic variables include at least the node's normal and tangential contact stress, tangential sliding distance, and normal separation displacement. These node movement control methods are then combined with the ALE adaptive mesh in the intermediate soft coating friction and wear analysis model to obtain the soft coating friction and wear analysis model. The sealing performance of the target sealing flange structure is evaluated based on the wear parameters.

2. The method for evaluating the sealing performance of a sealing structure as described in claim 1, characterized in that, The step of setting the first parameter of the two-dimensional axisymmetric finite element model to obtain the friction and wear analysis model of the intermediate soft coating includes: Multiple parameter setting objects are defined in the two-dimensional axisymmetric finite element model; the multiple parameter setting objects include at least a seal, a seal substrate, a soft layer, and a contact pair; the contact pair is the contact pair between the seal and the rigid surface. Determine multiple target attributes corresponding to multiple parameter setting objects; the multiple target attributes include at least the material properties of the seal, the contact properties of the contact pair, and the elastic modulus, Poisson's ratio, and true stress / strain curves of the seal substrate and the soft coating material, respectively. By combining the multiple target properties with the two-dimensional axisymmetric finite element model, the friction and wear analysis model of the intermediate soft coating is obtained.

3. The method for evaluating the sealing performance of a sealing structure as described in claim 1, characterized in that, The process of setting the soft coating mesh in the intermediate soft coating friction and wear analysis model using ALE adaptive meshing and setting the node motion control mode in the ALE adaptive mesh to obtain the soft coating friction and wear analysis model includes the following steps: Construct the soft coating mesh in the friction and wear analysis model of the intermediate soft coating; The construction of the soft coating mesh in the friction and wear analysis model of the intermediate soft coating includes: The sealing geometry model of the friction and wear analysis model of the intermediate soft coating is meshed using a preset reduction integration element strategy to obtain the target mesh region; the preset reduction integration element strategy includes at least the strategy of quadrilateral axisymmetric linear reduction integration element. Based on the target mesh region, combined with the coating region using regular quadrilateral units, the soft coating mesh is obtained.

4. The method for evaluating the sealing performance of a sealing structure as described in claim 1, characterized in that, The process of acquiring static stress load data of the target sealing flange structure in the target liquid rocket engine includes, prior to: Construct a three-dimensional static stress analysis model; Obtain transient thermal cycle load data of the target sealing flange structure; Based on the transient thermal cycle load data, the working process of the target liquid rocket engine is simulated and calculated using the three-dimensional static stress analysis model to obtain the static stress load data of the target sealing flange structure.

5. The method for evaluating the sealing performance of the sealing structure as described in claim 4, characterized in that, The construction of the three-dimensional static stress analysis model includes: The mesh type in the three-dimensional transient heat conduction analysis model is changed from the three-dimensional heat transfer element mesh type to the stress element mesh type to obtain an intermediate three-dimensional static stress analysis model; the stress element mesh type is used to read the transient thermal cycle load data of the start-up and shutdown cooling processes obtained by the transient heat conduction analysis according to the node number in the three-dimensional transient heat conduction analysis model; According to the preset parameter setting rules, the parameters of the intermediate three-dimensional static stress analysis model are set to obtain the three-dimensional static stress analysis model; the preset parameter setting rules include at least setting the material strength properties of the sealing flange structure in the intermediate three-dimensional static stress analysis model, setting the contact properties of the contact pair and the contact pair, setting the flange boundary, and setting the three-dimensional static stress analysis steps.

6. The method for evaluating the sealing performance of the sealing structure as described in claim 4, characterized in that, Prior to acquiring the transient thermal cycle load data of the target sealing flange structure, the following steps are included: Construct a three-dimensional transient heat conduction analysis model; Based on the operating parameters of the target liquid rocket engine, the heat transfer analysis of the target sealing flange structure is performed using the three-dimensional transient heat conduction analysis model to obtain the transient thermal cycle load data.

7. The method for evaluating the sealing performance of a sealing structure as described in claim 6, characterized in that, The construction of the three-dimensional transient heat conduction analysis model includes: A periodic symmetric model of the sealing flange structure is constructed. The sealing flange structure includes at least a flange, fasteners, and sealing components. The periodic symmetric model of the sealing flange structure includes at least one sector region of a bolt. The sector region is used to conduct transient heat conduction analysis during the working heating process and the shutdown cooling process. Based on the target parameters, the periodic symmetric model of the sealing flange structure is meshed according to a preset mesh type to obtain an intermediate three-dimensional transient heat conduction analysis model; the preset mesh type includes at least a three-dimensional heat transfer unit mesh type; the target parameters include at least one of the following: elastic modulus, Poisson's ratio, coefficient of thermal expansion, and thermal conductivity of the flange, fastener, and sealing material as a function of temperature. Based on the preset rules for setting loads and boundaries in transient heat transfer analysis, the intermediate three-dimensional transient heat conduction analysis model is parameter-set to obtain the three-dimensional transient heat conduction analysis model; the preset rules for setting loads and boundaries in transient heat transfer analysis include load and boundary setting rules for the heating process and load and boundary setting rules for the cooling process.

8. A device for evaluating the sealing performance of a sealing structure, characterized in that, include: The data acquisition module is used to acquire static stress load data of the target sealing flange structure in the target liquid rocket engine; The wear parameter determination module is used to determine the wear parameters between the soft coating and the flange contact surface in the target sealing flange structure based on the static stress load data and using a soft coating friction and wear analysis model. The determination of the wear parameters between the soft coating and the flange contact surface based on the static stress load data and using the soft coating friction and wear analysis model includes: constructing the soft coating friction and wear analysis model; the soft coating friction and wear analysis model is used at least to analyze the wear parameters of the soft coating on the sealing element and the rigid surface; constructing the soft coating friction and wear analysis model includes: acquiring the cross-sectional data of the sealing element in the target sealing flange structure; constructing a two-dimensional axisymmetric finite element model based on the cross-sectional data of the sealing element; setting the first parameter of the two-dimensional axisymmetric finite element model to obtain an intermediate soft coating friction and wear analysis model; and determining multiple target parameters for ALE adaptive mesh setting, wherein the multiple target parameters include at least... The mesh type, frequency control parameters, intensity control parameters, and mesh movement mode of the soft coating region are determined. Multiple target parameters are combined with the intermediate soft coating friction and wear analysis model to obtain an ALE adaptive mesh within the model. Multiple node movement control methods are determined for setting the ALE adaptive mesh. These methods include at least: acquiring data information of each node within the moving node set; acquiring node coordinate information; acquiring a series of elements connected to the node; acquiring node characteristic variables; adjusting mesh density based on wear conditions; and cumulative data writing. The node characteristic variables include at least the node's normal and tangential contact stress, tangential sliding distance, and normal separation displacement. These node movement control methods are then combined with the ALE adaptive mesh in the intermediate soft coating friction and wear analysis model to obtain the soft coating friction and wear analysis model. A sealing performance evaluation module is used to evaluate the sealing performance of the target sealing flange structure based on the wear parameters.

Images