Rocker arm roller wear risk assessment method and system and electronic equipment

Abstract

The invention discloses a rocker arm roller wear degree evaluation method and system and electronic equipment, and relates to the technical field of engines. According to the method, after a design model of the rocker arm roller assembly component is obtained, rigidity matrix data of each part forming the rocker arm roller assembly component is determined based on the design model; inputting the stiffness matrix data and design parameters and lubricating oil parameters of the rocker arm roller assembly component into an elastic liquid dynamic calculation model of the rocker arm roller assembly component to obtain an elastic liquid dynamic calculation result of the rocker arm roller assembly component; and evaluating whether the rocker roller assembly has a wear risk. Therefore, the problems of time consumption and high cost caused by the fact that different design parameters need to be changed to manufacture different sample pieces and then strength durability test verification is carried out when the rocker arm roller is abraded are solved.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and more specifically, to a rocker arm roller wear risk assessment method, system and electronic equipment. Background Art

[0002] In recent years, with the continuous improvement of engine strengthening, the wear problem of rocker rollers in the valve train has become more and more prominent. However, the current methods to solve the problem of rocker roller wear are based on experience to change the design scheme, that is, the design engineers make different samples by changing different design parameters based on their own experience, and then conduct strength and durability tests to verify. If it is found that there is no wear after the test, the scheme is locked; if it is still worn after the test, a new round of adjustments and verifications is required. It can be seen that this method greatly increases the time cost and test cost of problem solving. Therefore, it is urgent to find a method that can quickly identify and lock the root cause of rocker roller wear. Summary of the invention

[0003] In view of this, the embodiments of the present application are committed to providing a rocker arm roller wear risk assessment method, system and electronic device to solve the problem of time-consuming and costly problem of changing different design parameters to make different samples and then conducting strength and durability tests to verify the rocker arm roller wear problem.

[0004] In a first aspect, the present invention provides a rocker arm roller wear risk assessment method, comprising:

[0005] Obtain a design model of the rocker arm roller assembly component;

[0006] Based on the design model, determining stiffness matrix data of each part constituting the rocker roller assembly component;

[0007] Inputting the stiffness matrix data and the design parameters and lubricating oil parameters of the rocker arm roller assembly into the elastic liquid dynamics calculation model of the rocker arm roller assembly to obtain the elastic liquid dynamics calculation result of the rocker arm roller assembly;

[0008] Based on the elastic fluid dynamics calculation results, it is evaluated whether the rocker arm roller assembly has a wear risk.

[0009] In a possible implementation manner, determining stiffness matrix data of each part constituting the rocker roller assembly component based on the design model includes:

[0010] Based on the design model, construct a finite element model of the rocker arm roller assembly component;

[0011] Based on the finite element model, performing modal solution on each part constituting the rocker roller assembly component to obtain a result file;

[0012] The result file is imported into multi-body dynamics software to extract stiffness matrix data to obtain the stiffness matrix data.

[0013] In a possible implementation manner, the inputting the stiffness matrix data and the design parameters and lubricating oil parameters of the rocker arm roller assembly into the elastic liquid dynamics calculation model of the rocker arm roller assembly to obtain the elastic liquid dynamics calculation result of the rocker arm roller assembly includes:

[0014] The stiffness matrix data, the design parameters and the lubricating oil parameters are input into the elastic liquid dynamics calculation model of the rocker arm roller assembly component, so that the elastic liquid dynamics calculation model calculates the elastic liquid dynamics calculation result based on the preset correspondence between the working speed and the working condition of the rocker arm roller assembly component.

[0015] In a possible implementation manner, before inputting the stiffness matrix data and the design parameters and lubricating oil parameters of the rocker arm roller assembly into the elastic liquid dynamics calculation model of the rocker arm roller assembly, the method further includes:

[0016] Building an elastic fluid dynamics calculation model of the rocker arm roller assembly;

[0017] The elastic liquid dynamics calculation model for building the rocker roller assembly assembly includes:

[0018] Get the target component in the component library;

[0019] Based on the target element, construct an initial calculation model of elastic liquid dynamics of the rocker roller assembly;

[0020] Based on the structural characteristics of the rocker roller assembly, a connection relationship between the target elements in the elastic liquid dynamics initial calculation model is established to obtain the elastic liquid dynamics calculation model.

[0021] In a possible implementation manner, inputting the stiffness matrix data and the design parameters and lubricating oil parameters of the rocker arm roller assembly into the elastic liquid dynamics calculation model of the rocker arm roller assembly includes:

[0022] Importing the stiffness matrix data into corresponding target elements of the elastic liquid dynamics calculation model respectively;

[0023] The target element is assigned the corresponding design parameters and / or lubricating oil parameters, and the characteristic parameters include geometric characteristic parameters, mass characteristic parameters and mechanical characteristic parameters of the rocker arm roller assembly component.

[0024] In a possible implementation, the evaluating whether the rocker arm roller assembly has a wear risk based on the elastic fluid dynamics calculation result includes:

[0025] Retrieving a wear strong correlation result from the elastic liquid dynamics calculation result, wherein the wear strong correlation result is a calculation result whose correlation with the wear degree of the rocker arm roller assembly component exceeds a preset standard;

[0026] The wear strong correlation result is compared with a preset wear risk evaluation index to obtain an evaluation result of whether the rocker arm roller assembly component has a wear risk.

[0027] In a possible implementation, the method for determining the wear-strong correlation result includes:

[0028] Acquiring wear trace data of a rocker arm roller assembly faulty component corresponding to the rocker arm roller assembly;

[0029] Based on the wear trace data, the wear strong correlation result is determined in the elastic liquid dynamics calculation result.

[0030] In a possible implementation, the method for determining the wear risk evaluation index includes:

[0031] Retrieving simulation data for a target engine, wherein the target engine is an engine using a rocker arm roller assembly assembly of the same type as the rocker arm roller assembly assembly failure part;

[0032] The wear risk evaluation index is determined based on data corresponding to the wear strong correlation result in the simulation data.

[0033] In a second aspect, the present invention provides a rocker roller wear risk assessment system, comprising:

[0034] An acquisition unit, used for acquiring a design model of a rocker arm roller assembly component;

[0035] A first processing unit, configured to determine stiffness matrix data of each part constituting the rocker roller assembly component based on the design model;

[0036] The second processing unit is used to input the stiffness matrix data and the design parameters and lubricating oil parameters of the rocker arm roller assembly into the elastic liquid dynamics calculation model of the rocker arm roller assembly to obtain the elastic liquid dynamics calculation result of the rocker arm roller assembly

[0037] An evaluation unit is used to evaluate whether the rocker arm roller assembly component has a wear risk based on the elastic liquid dynamics calculation result.

[0038] In a third aspect, the present invention provides an electronic device, the electronic device comprising:

[0039] processor;

[0040] a memory for storing instructions executable by the processor;

[0041] The processor is used to execute the rocker arm roller wear risk assessment method provided in the first aspect of the present invention.

[0042] According to the rocker arm roller wear risk assessment method provided by the present invention, after obtaining the design model of the rocker arm roller assembly component, the stiffness matrix data of each part constituting the rocker arm roller assembly component is first determined based on the design model, and then the stiffness matrix data and the design parameters and lubricating oil parameters of the rocker arm roller assembly component are input into the elastic liquid dynamics calculation model of the rocker arm roller assembly component to obtain the elastic liquid dynamics calculation result of the rocker arm roller assembly component, and finally based on the elastic liquid dynamics calculation result, it is evaluated whether the rocker arm roller assembly component has a wear risk. Thus, the verification of the cause of rocker arm roller wear in a virtual scene is realized, which effectively improves the verification efficiency and reduces the verification cost compared with the physical verification. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0044] Figure 1 Shown is a flow chart of a rocker arm roller wear risk assessment method provided by an embodiment of the present invention.

[0045] Figure 2 Shown is a schematic structural diagram of a rocker arm roller assembly component.

[0046] Figure 3 Shown is a schematic diagram of an example of modal analysis provided by an embodiment of the present invention.

[0047] Figure 4 Shown is a schematic diagram of an example of a modal calculation result provided by an embodiment of the present invention.

[0048] Figure 5Shown is a schematic diagram of an example of a stiffness matrix provided by an embodiment of the present invention.

[0049] Figure 6 Shown is a schematic diagram of the rough contact pressure between the matching surfaces of the rocker roller and the rocker shaft of a rocker roller assembly assembly solution before optimization of a six-cylinder internal combustion engine provided by an embodiment of the present invention.

[0050] Figure 7 Shown is a schematic diagram of the rough contact pressure between the mating surfaces of the rocker roller and the rocker shaft of an optimized rocker roller assembly assembly solution for a six-cylinder internal combustion engine provided by an embodiment of the present invention.

[0051] Figure 8 The flowchart shown is a method for evaluating the wear risk of a rocker arm roller assembly using the rocker arm roller wear risk evaluation method provided in an embodiment of the present invention.

[0052] Fig. 9 Shown is a structural diagram of a rocker roller wear risk assessment system provided by an embodiment of the present invention.

[0053] Fig.10 Shown is a schematic structural diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0054] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of this specification shall have the common meanings understood by persons with ordinary skills in the field to which this specification belongs. The words "first", "second" and similar words used in the embodiments of this specification do not indicate any order, quantity or importance, but are only used to avoid confusion of constituent elements.

[0055] Unless the context requires otherwise, throughout the specification, "plurality" means "at least two", and "including" is interpreted as an open, inclusive meaning, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples" or "some examples" are intended to indicate that a particular feature, structure, material or characteristic associated with the embodiment or example is included in at least one embodiment or example of the specification. The schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0056] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this specification.

[0057] It is understandable that the existing method to solve the rocker arm roller wear problem is: the valve train engineer adjusts different design parameters based on design experience and problem analysis reports of worn parts, such as lubricating oil pressure, part surface roughness, part surface hardness, part contact surface width, part contact surface diameter, part matching clearance, etc., and then makes different samples, and then assembles them on different engines to verify the durability reliability test. This method has the following shortcomings:

[0058] 1. It may be necessary to make several rounds of plans and verifications;

[0059] 2. It takes a long time to close the problem, which consumes a lot of manpower, material resources and financial resources.

[0060] The present invention aims to solve the above-mentioned problem by utilizing elastic liquid dynamics (EHD) calculation to realize simulation verification of a rocker arm roller assembly after adjusting the design parameters of a faulty part of the rocker arm roller assembly.

[0061] Furthermore, the rocker arm roller wear risk assessment method provided by the present invention is executed on an electronic device, which may be an intelligent terminal such as a smart phone, a laptop computer, or a network-side server.

[0062] Based on the above, see Figure 1 , Figure 1 is a flow chart of a rocker arm roller wear risk assessment method provided by an embodiment of the present invention, such as Figure 1 As shown, the process of the method may include:

[0063] S100, obtaining a design model of a rocker arm roller assembly component.

[0064] S110. Based on the design model, determine the stiffness matrix data of each part constituting the rocker roller assembly component.

[0065] Specifically, in an optional embodiment, based on the design model, the stiffness matrix data of each part constituting the rocker roller assembly is determined, including:

[0066] Based on the design model, a finite element model of the rocker arm roller assembly is constructed;

[0067] Based on the finite element model, the modal solution of each part of the rocker roller assembly is performed to obtain the result file;

[0068] The result file is imported into the multi-body dynamics software to extract the stiffness matrix data and obtain the stiffness matrix data.

[0069] In this embodiment, determining the stiffness matrix data of the rocker arm roller assembly is divided into three steps: finite element three-dimensional meshing, structural modal solution, and stiffness matrix data extraction. Among them, the implementation method for finite element three-dimensional meshing can be: importing the design model of the rocker arm roller assembly into the meshing software, and retaining the detailed structures of the chamfers, fillets, oil holes, and oil grooves of each part constituting the rocker arm roller assembly, and then dividing it into three-dimensional meshes along the axial and radial directions.

[0070] In some possible embodiments, considering that the size of the rocker roller assembly in the axial direction is generally greater than 6mm, and in order to ensure the accuracy of the axial results, the axial grid size is generally controlled at about 1mm; and a circle in the radial direction is 360 degrees. Also considering the accuracy of the radial results, a radial grid of ≤10 degrees is appropriate. Therefore, the rocker roller assembly can be divided into a three-dimensional grid of no less than 6 layers in the axial direction and 36×n layers in the radial direction (n is a natural number greater than 1).

[0071] Furthermore, for the structural modal solution, the finite element solution software can be used to establish the modal solution model, that is, the rocker roller assembly is split into a calculation model for each part, and its modal output order is set to 36×m (m is a natural number greater than or equal to 1), and then submitted for solution.

[0072] For the extraction of stiffness matrix data, the built-in stiffness matrix data extraction module of the multibody dynamics software can be used. That is, the stiffness matrix data can be automatically extracted by importing the result file of the previous modal solution. The extracted stiffness matrix data will be saved in .txt format, and each part will save a stiffness matrix data.

[0073] The following is a detailed description of the implementation process of determining the stiffness matrix data of each part of the rocker roller assembly based on the design model from the perspective of an example, namely:

[0074] First, for Figure 2 The design model of the rocker roller assembly shown (consisting of a rocker roller and a rocker shaft) is meshed: the design model is imported into the finite element meshing software, the detailed structures of the chamfers, fillets, oil holes and oil grooves of each component are retained, and a three-dimensional mesh with 6 axial layers and 72 radial layers is divided. The meshes generated by the two parts are exported into two .inp files respectively, and the names are changed to roll.inp and shaft.inp. The modal calculation model is built using the two mesh models output above: that is, the roll.inp mesh and shaft.inp mesh files are imported into the abaqus software respectively, and the materials are assigned the material parameters of alloy steel. For example, the material parameters of alloy steel are: density 7.85 tons / m 3, elastic modulus is 21000MPa, Poisson's ratio is 0.3; establish modal analysis step, select Lanczos method for modal analysis, and output as follows Figure 3 Results for the first 36 modes are shown.

[0075] Then perform modal stiffness calculation: create a calculation task named job1 in the job module of the abaqus software, and click the submit button to submit the calculation, such as Figure 4 As shown. The modal results after the calculation are completed are saved in the job1.odb file. Open the multibody dynamics software, import the job1.odb file generated by the above calculation in the stiffness matrix extraction module, click to output the stiffness matrix data, and obtain the stiffness matrix file named job1.txt. From the above mesh division, it can be seen that the calculation mesh in this example is divided into 6 axial meshes, 72 radial meshes, and the two meshes on the axial side are rounded transition layer meshes. The stiffness does not need to be output, so the nodes for the stiffness that need to be output are (6-2+1)×72=360, that is, the output stiffness matrix is ​​360×360 (each node has a stiffness value between itself and other nodes). The output stiffness matrix is ​​as follows Figure 5 shown.

[0076] S120, inputting the stiffness matrix data and the design parameters and lubricating oil parameters of the rocker arm roller assembly into the elastic liquid dynamics calculation model of the rocker arm roller assembly to obtain the elastic liquid dynamics calculation result of the rocker arm roller assembly.

[0077] Specifically, the design parameters of the rocker roller assembly include diameter, width, surface roughness, fitting clearance, etc., and the lubricating oil parameters include lubricating oil brand, temperature, dynamic viscosity, density, etc. By taking the stiffness matrix data, the design parameters of the rocker roller assembly and the lubricating oil parameters together as the input parameters of the elastic liquid dynamics calculation model of the rocker roller assembly, the elastic liquid dynamics calculation results of the rocker roller assembly can be obtained by the elastic liquid dynamics calculation model, such as: rough contact pressure of the fitting surface, total contact pressure, oil film pressure, oil leakage, friction work, etc.

[0078] Specifically, in an optional embodiment, the stiffness matrix data and the design parameters and lubricating oil parameters of the rocker arm roller assembly are input into the elastic liquid dynamics calculation model of the rocker arm roller assembly to obtain the elastic liquid dynamics calculation results of the rocker arm roller assembly, including:

[0079] The stiffness matrix data, design parameters and lubricating oil parameters are input into the elastic liquid dynamics calculation model of the rocker arm roller assembly component, so that the elastic liquid dynamics calculation model calculates the elastic liquid dynamics calculation result based on the corresponding relationship between the working speed and working conditions of the preset rocker arm roller assembly component.

[0080] Specifically, the operating conditions are divided according to the characteristic speed of the engine, such as the operating conditions may include: idle speed, rated speed, overspeed, etc.

[0081] In some possible embodiments, considering that the speed ratio of the engine camshaft and the rocker roller is usually 1:2, the speed of the rocker roller is the same as the engine speed. Then, when the characteristic speed of the engine is 600 rpm at idle, 1800 rpm at rated speed, and 2100 rpm at overspeed, the correspondence between the operating speed of the rocker roller assembly and the operating condition can be set as follows: idle corresponds to 600 rpm, rated speed corresponds to 1800 rpm, and overspeed corresponds to 2100 rpm.

[0082] In some possible embodiments, by setting the operating speed of the rocker roller assembly in the calculation condition, even if one operating speed corresponds to one working condition, after the working condition is set, by clicking the run button of the multi-body dynamics software, the built-in solver of the software can be used to solve the elastic liquid dynamics of the rocker roller.

[0083] In an optional embodiment, before inputting the stiffness matrix data and the design parameters and lubricating oil parameters of the rocker arm roller assembly into the elastic liquid dynamics calculation model of the rocker arm roller assembly, the method further includes:

[0084] Build an elastic fluid dynamics computational model of the rocker arm roller assembly;

[0085] Build an elastic fluid dynamics computational model of the rocker roller assembly, including:

[0086] Get the target component in the component library;

[0087] Based on the target element, build the initial calculation model of elastic fluid dynamics of the rocker roller assembly;

[0088] Based on the structural characteristics of the rocker roller assembly, the connection relationship between the target elements in the initial calculation model of elastic liquid dynamics is established to obtain the elastic liquid dynamics calculation model.

[0089] Specifically, the target components can be selected from the component library built into the multi-body dynamics software, and then the initial elastic liquid dynamics calculation model of the rocker roller assembly is built using the building block method. Finally, the target components with connection relationships are connected in pairs using solid lines in the connection library to obtain the elastic liquid dynamics calculation model.

[0090] In an optional embodiment, the stiffness matrix data and the design parameters and lubricating oil parameters of the rocker arm roller assembly are input into the elastic liquid dynamics calculation model of the rocker arm roller assembly, including:

[0091] Importing stiffness matrix data into corresponding target elements of elastic liquid dynamics calculation model respectively;

[0092] Assign corresponding design parameters and / or lubricant parameters to the target component.

[0093] The design parameters include geometric characteristic parameters, mass characteristic parameters and mechanical characteristic parameters of the rocker arm roller assembly.

[0094] Specifically, the process of inputting the stiffness matrix data and the design parameters and lubricating oil parameters of the rocker arm roller assembly into the elastic liquid dynamics calculation model of the rocker arm roller assembly is the process of setting the model parameters for the elastic liquid dynamics calculation model.

[0095] More specifically, by importing the extracted stiffness matrix data of each part into the corresponding target element in the model, the stiffness matrix of the three-dimensional part can be assigned to the target element of the dynamic model.

[0096] Furthermore, the geometric characteristic parameters of the rocker roller assembly include: the size, fit clearance, fit diameter and fit width of each part; the quality characteristic parameters include: the hardness and surface roughness of each part; the mechanical characteristic parameters include: the external load received by the roller during operation, etc. Then, the corresponding design parameters and / or lubricant parameters are assigned to the target element, which may include filling in the size information, hardness information, surface roughness information, etc. of each three-dimensional component in each target element; inputting the fit clearance, fit diameter, fit width and lubricant parameters in the fitting element, and importing the external load received by the roller during operation in the load module.

[0097] From the perspective of an example, the following specifically describes the implementation process of inputting the stiffness matrix data and the design parameters and lubricating oil parameters of the rocker arm roller assembly into the elastic liquid dynamics calculation model of the rocker arm roller assembly to obtain the elastic liquid dynamics calculation results of the rocker arm roller assembly, namely:

[0098] First, multi-body dynamics software (such as AVL-excite, InNexSight, etc.) is used to select the required components as target components from its built-in component library, and the initial elastic liquid dynamics calculation model of the rocker roller assembly is built by the building blocks method. Then, the target components with connection relationships are connected in pairs using the solid lines in the connection library to obtain the elastic liquid dynamics calculation model of the rocker roller assembly. After that, the extracted stiffness matrix data of each part is imported into the corresponding target components in the model, and the size information, hardness information, surface roughness information, etc. of each three-dimensional component are filled in each target component; the matching clearance, matching diameter, matching width and lubricating oil parameters are input in the matching components; the external loads received by the roller during operation are imported in the load module; finally, the results to be output are selected in the output module of the multi-body dynamics software, such as: rough contact pressure of the matching surface, total contact pressure, oil film pressure, oil leakage, friction work, etc.

[0099] Then set the working speed of the rocker roller assembly in the calculation condition. Set one working condition for one speed, or set multiple working conditions at the same time. After the working condition is set, click the run button of the multi-body dynamics software to use the built-in solver of the software to solve the elastic liquid dynamics of the rocker roller assembly. The solved results are saved in the result file.

[0100] S130. Based on the elastic liquid dynamics calculation results, assess whether the rocker arm roller assembly has a wear risk.

[0101] Specifically, in an optional embodiment, based on the elastic fluid dynamics calculation results, evaluating whether the rocker arm roller assembly has a wear risk includes:

[0102] Retrieving a wear strong correlation result from the elastic fluid dynamics calculation result, where the wear strong correlation result is a calculation result whose correlation with the wear degree of the rocker arm roller assembly component exceeds a preset standard;

[0103] The wear strong correlation results are compared with the preset wear risk evaluation index to obtain the evaluation result of whether the rocker arm roller assembly has wear risk.

[0104] In this embodiment, taking the rough contact pressure of the rocker roller assembly as an example, the wear strong correlation result is assumed to be the wear risk evaluation index as shown in Table 1 below:

[0105] Table 1 Wear risk evaluation indicators

[0106]

[0107] By comparing the rough contact pressure of the rocker arm roller assembly in the elastic fluid dynamics calculation results with the wear risk evaluation index shown in Table 1, an evaluation result of whether the rocker arm roller assembly has a wear risk can be obtained.

[0108] It can be understood that, for evaluating whether there is a wear risk in the rocker roller assembly based on the elastic liquid dynamics calculation results, in addition to the assessment of the wear risk, it can also include the determination of wear-strong correlation results and wear risk evaluation indicators.

[0109] Based on this, in an optional embodiment, a method for determining a wear-strong correlation result is provided, which includes:

[0110] Acquiring wear trace data of a rocker arm roller assembly component failure component corresponding to the rocker arm roller assembly component;

[0111] Based on the wear trace data, strong wear correlation results were identified in the elastic liquid dynamics calculation results.

[0112] In some possible embodiments, after comparison with the wear traces of the faulty part, the rough contact pressure between the locking rocker arm roller and the roller shaft is a strongly related result of wear.

[0113] In an optional embodiment, a method for determining a wear risk evaluation index is provided, comprising:

[0114] Retrieving simulation data for a target engine, where the target engine is an engine using a rocker arm roller assembly assembly of the same type as the rocker arm roller assembly assembly failure part;

[0115] Based on the data corresponding to the wear-strongly correlated results in the simulation data, the wear risk evaluation index is determined.

[0116] It is understandable that engine manufacturers generally perform simulation calculations on the engine and then save the simulation results in a database to form a simulation database of the engine.

[0117] Based on this, the simulation data of the target engine can be obtained through the simulation database of the engine. Further, taking the rough contact pressure between the rocker roller and the roller shaft as an example of a wear-related result, by comparing the rough contact pressure data between the rocker roller and the roller shaft of each project in the simulation data, the wear risk evaluation index of the rocker roller assembly component shown in Table 1 can be determined.

[0118] The following is a specific example of the implementation process of evaluating whether the rocker arm roller assembly has a wear risk based on the elastic fluid dynamics calculation results, namely:

[0119] Firstly, the calculation results of elastic liquid dynamics were analyzed, and combined with the wear position and wear degree of the corresponding roller rocker arm assembly faulty parts, it was found that the rough contact pressure between the mating surfaces of the rocker arm roller and the rocker arm shaft was completely consistent with the wear marks of the sample after the test, that is, the position where the rough contact pressure was large was severely worn, and the position where the rough contact pressure was small had no wear marks. Therefore, the rough contact pressure between the mating surfaces of the rocker arm roller and the rocker arm shaft was defined as an indicator strongly correlated with wear.

[0120] Then the rough contact pressure value between the rocker roller and the rocker shaft mating surface is compared with the determined wear risk evaluation index. Taking the wear risk evaluation index as shown in Table 1 as an example, if the rough contact pressure value exceeds 90MPa, it is judged as wear; if the rough contact pressure value is less than 70MPa, it is judged as no wear; and if the rough contact pressure value is between 70-90MPa, it is judged as possible wear. Whether it is wear needs to be verified by test. Therefore, in engineering projects, it is sufficient to ensure that the rough contact pressure value between the rocker roller and the rocker shaft mating surface is less than 70MPa.

[0121] Afterwards, if the comparison result is not up to standard, the design model and design parameters need to be modified to carry out the next round of rocker roller elastic liquid dynamics modeling solution and evaluation. If the comparison result is up to standard, the design solution will be output.

[0122] It should be noted that, from P = F ÷ A (P is the contact surface pressure, F is the external force, and A is the contact area), it can be seen that increasing the contact diameter and increasing the contact width can reduce the contact pressure. The fit clearance and contact pressure have no clear directionality, so a series of fit clearance optimization calculations from small clearance to large clearance are required to find the fit clearance with the smallest rough contact pressure under a specific structure.

[0123] Specifically, Figure 6 and Figure 7 They are respectively the rough contact pressure between the rocker roller and the rocker shaft mating surface of the rocker roller assembly assembly schemes before and after optimization for a six-cylinder internal combustion engine. The original scheme had multiple rocker roller wear problems in the bench test, which resulted in the engine durability test being unable to proceed smoothly; by adopting the rocker roller wear risk assessment method provided in an embodiment of the present invention, that is, using multi-body dynamics software to build a rocker roller elastic liquid dynamics calculation model, it was calculated that the rough contact pressure value between the rocker roller and the rocker shaft mating surface was 119MPa, which exceeded the critical wear pressure of 70-90MPa, and it was assessed that it did not meet the standard, and the roller had a wear risk. The calculated rough contact pressure value between the rocker roller and the rocker shaft mating surface of the optimized scheme was 52.6MPa, which did not exceed the critical wear pressure of 70-90MPa, and it was assessed that it met the standard, and the roller had no wear risk.

[0124] In summary, the overall process of applying the rocker arm roller wear risk assessment method provided in the above embodiment to perform rocker arm roller wear risk assessment is as follows: Figure 8 As shown. The rocker roller wear risk assessment method provided by an embodiment of the present invention, by providing a method for extracting a three-dimensional data stiffness matrix, greatly shortens the calculation time of elastic fluid dynamics while ensuring the calculation accuracy. Compared with the prior art, a rocker roller elastic fluid dynamics calculation modeling method and solution method are proposed. The physical verification scene is moved to the virtual verification. When the model is built, dozens of schemes can be verified in one day, which greatly improves the verification efficiency and reduces the verification cost. A rocker roller elastic fluid dynamics calculation result evaluation method is proposed, that is, the results that are strongly correlated with wear are identified from a large number of calculation results, and the critical wear range of the result is determined, and then the calculation result is compared with the critical result, so as to achieve an accurate judgment of whether there is a wear risk for the rocker roller assembly.

[0125] A rocker arm roller wear risk assessment system provided in an embodiment of the present invention is introduced below. The rocker arm roller wear risk assessment system described below can be considered as a module architecture for implementing a rocker arm roller wear risk assessment method provided in an embodiment of the present invention; the content described below can be cross-referenced with the above.

[0126] See also Fig. 9 , Fig. 9 : is a structural block diagram of a rocker roller wear risk assessment system provided by an embodiment of the present invention, and the system may include:

[0127] The acquisition unit 10 is used to obtain the design model of the rocker roller assembly component;

[0128] A first processing unit 20 is used to determine stiffness matrix data of each part constituting the rocker roller assembly component based on the design model;

[0129] The second processing unit 30 is used to input the stiffness matrix data and the design parameters and lubricating oil parameters of the rocker arm roller assembly into the elastic liquid dynamics calculation model of the rocker arm roller assembly to obtain the elastic liquid dynamics calculation result of the rocker arm roller assembly;

[0130] The evaluation unit 40 is used to evaluate whether there is a wear risk of the rocker arm roller assembly based on the elastic fluid dynamics calculation results.

[0131] Optionally, the first processing unit 20 is specifically configured to:

[0132] Based on the design model, a finite element model of the rocker arm roller assembly is constructed;

[0133] Based on the finite element model, the modal solution of each part of the rocker roller assembly is performed to obtain the result file;

[0134] The result file is imported into the multi-body dynamics software to extract the stiffness matrix data and obtain the stiffness matrix data.

[0135] Optionally, the second processing unit 30 is specifically configured to:

[0136] The stiffness matrix data, design parameters and lubricating oil parameters are input into the elastic liquid dynamics calculation model of the rocker arm roller assembly component, so that the elastic liquid dynamics calculation model calculates the elastic liquid dynamics calculation result based on the corresponding relationship between the working speed and working conditions of the preset rocker arm roller assembly component.

[0137] Optionally, the second processing unit 30 is further configured to:

[0138] Build an elastic fluid dynamics computational model of the rocker arm roller assembly;

[0139] Build an elastic fluid dynamics computational model of the rocker roller assembly, including:

[0140] Get the target component in the component library;

[0141] Based on the target element, build the initial calculation model of elastic fluid dynamics of the rocker roller assembly;

[0142] Based on the structural characteristics of the rocker roller assembly, the connection relationship between the target elements in the initial calculation model of elastic liquid dynamics is established to obtain the elastic liquid dynamics calculation model.

[0143] Optionally, the second processing unit 30 is further specifically configured to:

[0144] Importing stiffness matrix data into corresponding target elements of elastic liquid dynamics calculation model respectively;

[0145] Corresponding design parameters and / or lubricating oil parameters are assigned to the target element, wherein the design parameters include geometric characteristic parameters, mass characteristic parameters and mechanical characteristic parameters of the rocker arm roller assembly component.

[0146] Optionally, the evaluation unit 40 is specifically configured to:

[0147] Retrieving a wear strong correlation result from the elastic fluid dynamics calculation result, where the wear strong correlation result is a calculation result whose correlation with the wear degree of the rocker arm roller assembly component exceeds a preset standard;

[0148] The wear strong correlation results are compared with the preset wear risk evaluation index to obtain the evaluation result of whether the rocker arm roller assembly has wear risk.

[0149] Optionally, the evaluation unit 40 is further configured to:

[0150] Acquiring wear trace data of a rocker arm roller assembly component failure component corresponding to the rocker arm roller assembly component;

[0151] Based on the wear trace data, strong wear correlation results were identified in the elastic liquid dynamics calculation results.

[0152] Optionally, the evaluation unit 40 is further configured to:

[0153] Retrieving simulation data for a target engine, where the target engine is an engine using a rocker arm roller assembly assembly of the same type as the rocker arm roller assembly assembly failure part;

[0154] Based on the data corresponding to the wear-strongly correlated results in the simulation data, the wear risk evaluation index is determined.

[0155] Below, reference Fig.10 To describe the electronic device provided by the embodiment of the present application, the electronic device provided by the embodiment may include: at least one processor 100, at least one communication interface 200, at least one memory 300 and at least one communication bus 400;

[0156] In the embodiment of the present invention, the number of the processor 100, the communication interface 200, the memory 300, and the communication bus 400 is at least one, and the processor 100, the communication interface 200, and the memory 300 communicate with each other through the communication bus 400; obviously, Fig.10 The communication connections shown for the processor 100, the communication interface 200, the memory 300, and the communication bus 400 are merely optional;

[0157] Optionally, the communication interface 200 may be an interface of a communication module, such as an interface of a GSM module; the processor 100 may be a central processing unit CPU, or an application specific integrated circuit ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present invention.

[0158] The memory 300 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0159] The processor 100 is specifically used to execute the application program in the memory to implement the steps of the above-mentioned rocker arm roller wear risk assessment method.

[0160] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0161] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0162] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0163] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0164] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly explain the technical solutions and cannot be used to limit the scope of protection of the present application.

[0165] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A rocker arm roller wear risk assessment method, characterized in that: include: Obtain a design model of the rocker arm roller assembly component; Based on the design model, determining stiffness matrix data of each part constituting the rocker roller assembly component; Inputting the stiffness matrix data and the design parameters and lubricating oil parameters of the rocker arm roller assembly into the elastic liquid dynamics calculation model of the rocker arm roller assembly to obtain the elastic liquid dynamics calculation result of the rocker arm roller assembly; Based on the elastic fluid dynamics calculation results, it is evaluated whether the rocker arm roller assembly has a wear risk.

2. The method according to claim 1, characterized in that Determining stiffness matrix data of each part constituting the rocker roller assembly component based on the design model includes: Based on the design model, construct a finite element model of the rocker arm roller assembly component; Based on the finite element model, performing modal solution on each part constituting the rocker roller assembly component to obtain a result file; The result file is imported into multi-body dynamics software to extract stiffness matrix data to obtain the stiffness matrix data.

3. The method according to claim 1, characterized in that The step of inputting the stiffness matrix data and the design parameters and lubricating oil parameters of the rocker arm roller assembly into the elastic liquid dynamics calculation model of the rocker arm roller assembly to obtain the elastic liquid dynamics calculation result of the rocker arm roller assembly includes: The stiffness matrix data, the design parameters and the lubricating oil parameters are input into the elastic liquid dynamics calculation model of the rocker arm roller assembly component, so that the elastic liquid dynamics calculation model calculates the elastic liquid dynamics calculation result based on the preset correspondence between the working speed and the working condition of the rocker arm roller assembly component.

4. The method according to claim 1, characterized in that: Before inputting the stiffness matrix data and the design parameters and lubricating oil parameters of the rocker arm roller assembly into the elastic liquid dynamics calculation model of the rocker arm roller assembly, the method further includes: Building an elastic fluid dynamics calculation model of the rocker arm roller assembly; The elastic liquid dynamics calculation model for building the rocker roller assembly assembly includes: Get the target component in the component library; Based on the target element, construct an initial calculation model of elastic liquid dynamics of the rocker roller assembly; Based on the structural characteristics of the rocker roller assembly, a connection relationship between the target elements in the elastic liquid dynamics initial calculation model is established to obtain the elastic liquid dynamics calculation model.

5. The method according to claim 4, characterized in that The step of inputting the stiffness matrix data and the design parameters and lubricating oil parameters of the rocker arm roller assembly into the elastic liquid dynamics calculation model of the rocker arm roller assembly comprises: Importing the stiffness matrix data into corresponding target elements of the elastic liquid dynamics calculation model respectively; The target element is assigned the corresponding design parameters and / or lubricating oil parameters, wherein the design parameters include geometric characteristic parameters, mass characteristic parameters and mechanical characteristic parameters of the rocker arm roller assembly component.

6. The method according to claim 1, characterized in that The step of evaluating whether the rocker arm roller assembly has a wear risk based on the elastic fluid dynamics calculation result includes: Retrieving a wear strong correlation result from the elastic liquid dynamics calculation result, wherein the wear strong correlation result is a calculation result whose correlation with the wear degree of the rocker arm roller assembly component exceeds a preset standard; The wear strong correlation result is compared with a preset wear risk evaluation index to obtain an evaluation result of whether the rocker arm roller assembly component has a wear risk.

7. The method according to claim 6, characterized in that The method for determining the wear-related strong result comprises: Acquiring wear trace data of a rocker arm roller assembly faulty component corresponding to the rocker arm roller assembly; Based on the wear trace data, the wear strong correlation result is determined in the elastic liquid dynamics calculation result.

8. The method according to claim 7, characterized in that The method for determining the wear risk evaluation index includes: Retrieving simulation data for a target engine, wherein the target engine is an engine using a rocker arm roller assembly assembly of the same type as the rocker arm roller assembly assembly failure part; The wear risk evaluation index is determined based on data corresponding to the wear strong correlation result in the simulation data.

9. A rocker arm roller wear risk assessment system, characterized in that: include: An acquisition unit, used for acquiring a design model of a rocker arm roller assembly component; A first processing unit, configured to determine stiffness matrix data of each part constituting the rocker roller assembly component based on the design model; A second processing unit is used to input the stiffness matrix data and the design parameters and lubricating oil parameters of the rocker arm roller assembly into the elastic liquid dynamics calculation model of the rocker arm roller assembly to obtain the elastic liquid dynamics calculation result of the rocker arm roller assembly; An evaluation unit is used to evaluate whether the rocker arm roller assembly component has a wear risk based on the elastic liquid dynamics calculation result.

10. An electronic device, characterized in that: The electronic device comprises: processor; a memory for storing instructions executable by the processor; The processor is used to execute the method according to any one of claims 1 to 8.

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