Crankshaft system modeling method, device and equipment
By establishing a finite element model of the crankshaft system, setting reference points and applying binding force, and calculating constraint mode values, the problem of engine knocking problems under idle charging conditions in automotive design and development is solved, and the effect of quickly positioning the root cause of the problem and verifying the design scheme is achieved, and design and development efficiency and cost-effectiveness are improved.
Patent Information
- Application Number
- CN202411984351.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-05-13
AI Technical Summary
During the automotive design and development process, engine knocking problems occur occasionally under idle charging conditions, resulting in accelerated wear of crankshafts and other components, affecting engine stability and durability, and it is difficult to avoid risks by modifying the crankshaft geometric design, and there is a lack of means to quickly locate the root cause of the problem.
By establishing a three-dimensional model of the crankshaft system, creating a finite element model, setting reference points, establishing connection relationships, applying spring stiffness and fixed binding force, and calculating constraint mode values to determine the vibration mode and potential problem areas of the crankshaft system.
It realizes a more accurate description of the contact between the crankshaft and the cylinder, quickly verify the impact of the design scheme on the crankshaft system, effectively saves design and development and solution verification time, reduces development costs, and improves the ability to solve the shaft system knocking problem under idle charging conditions.
Smart Images
Figure CN119989777A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of modeling technology, and in particular to a crankshaft system modeling method, device and equipment. Background Art
[0002] At present, in the process of automobile design and development, the problem of engine knocking occasionally occurs when the car is idling and charging. The problem of engine knocking will accelerate the wear of key components such as pistons and crankshafts, affect the stability and durability of the engine, shorten the life of the engine, and further lead to weakened vehicle power performance and increased fuel consumption.
[0003] The occurrence of engine knocking is closely related to the Atkinson cycle of hybrid vehicles and the bending mode of the crankshaft system. Therefore, in related technologies, optimizing the crankshaft main journal stiffness can reduce the probability of risk problems to a certain extent and mitigate the impact of risk problems. However, in the later stages of design and development, it is difficult to avoid the occurrence of risk problems by modifying the geometric design of the crankshaft, and there is no more effective means to quickly locate the root cause of the problem, which affects the progress of design and development. Summary of the invention
[0004] The embodiments of the present invention provide a crankshaft system modeling method, device and equipment to solve the problem in the prior art that it is difficult to avoid risks in crankshaft modeling by modifying the geometric design of the crankshaft.
[0005] In a first aspect, an embodiment of the present invention provides a crankshaft system modeling method, the method comprising:
[0006] Establish a finite element model of the crankshaft system based on the three-dimensional model of the crankshaft system;
[0007] A target crankshaft system model is obtained by creating a connection, creating a spring stiffness, and applying a fixed constraint force in the crankshaft system finite element model;
[0008] Calculation is performed using the target crankshaft system model to determine constraint modal values of the crankshaft system.
[0009] Optionally, establishing a finite element model of the crankshaft system based on the three-dimensional model of the crankshaft system includes:
[0010] Performing mesh control on a first structure in the three-dimensional model of the crankshaft system by using a preset first mesh size;
[0011] Dividing a second structure in the three-dimensional model of the crankshaft system by a preset second grid size;
[0012] The first structure is chamfers, fillets and process holes of specific sizes, and the second structure is 6-node triangular units and 10-node tetrahedral units.
[0013] Optionally, the target crankshaft system model is obtained by creating a connection, creating a spring stiffness, and applying a fixed constraint force in the crankshaft system finite element model, including:
[0014] establishing a reference point on a crankshaft within a finite element model of the crankshaft system;
[0015] Based on the reference point, a connection relationship between the reference point and the crankshaft surface is established, a spring stiffness between the reference points is established, and a fixed constraint force is applied to the reference point;
[0016] Wherein, establishing a reference point on the crankshaft in the finite element model of the crankshaft system includes:
[0017] Establishing first reference points at bolt connection holes of the crankshaft and the flywheel in the finite element model of the crankshaft system respectively;
[0018] Establishing a second reference point at the center of each non-middle section main journal of the crankshaft;
[0019] Based on each of the second reference points, a third reference point is established in the axial direction from the rear end of the crankshaft to the front end of the crankshaft along the crankshaft;
[0020] Establishing a fourth reference point at the center of the main journal of the middle section of the crankshaft;
[0021] Based on the fourth reference point, a fifth reference point is established in the axial direction from the rear end of the crankshaft to the front end of the crankshaft along the crankshaft.
[0022] Optionally, establishing a connection relationship between the reference point and the crankshaft surface based on the reference point includes:
[0023] Establishing a connection relationship between each of the first reference points and the inner surface of the corresponding bolt hole;
[0024] Establishing a connection relationship between each of the second reference points and the inner and outer surfaces of the crankshaft within a first preset range on the lower side of the main journal of the corresponding section;
[0025] Establishing a connection relationship between the fourth reference point and the inner and outer surfaces within a second preset range below the thrust bearing force surfaces on both sides of the main journal of the middle section of the crankshaft;
[0026] The established connection relationship is a rigid coupling connection.
[0027] Optionally, establishing a spring stiffness between the reference points based on the reference points comprises:
[0028] Applying radial spring stiffness to a second reference point and a third reference point at the center of each non-middle section main journal of the crankshaft;
[0029] Axial spring stiffness is applied to a fourth reference point and a fifth reference point of the middle section main journal of the crankshaft.
[0030] Optionally, applying a fixed constraint force to the reference point based on the reference point includes:
[0031] Applying a full fixed restraint force to each of the third reference point and the fifth reference point;
[0032] The full fixed constraint force is used to constrain the degrees of freedom in six directions of each of the third reference point and the fifth reference point.
[0033] In a second aspect, an embodiment of the present invention provides a crankshaft system modeling device, the device comprising:
[0034] The first modeling module establishes a finite element model of the crankshaft system based on the three-dimensional model of the crankshaft system;
[0035] A second modeling module obtains a target crankshaft system model by creating a connection, creating a spring stiffness, and applying a fixed constraint force in the crankshaft system finite element model;
[0036] A calculation module is used to perform calculations using the target crankshaft system model to determine the constraint modal value of the crankshaft system.
[0037] Optionally, the target crankshaft system model is obtained by creating a connection, creating a spring stiffness, and applying a fixed constraint force in the crankshaft system finite element model, including:
[0038] establishing a reference point on a crankshaft within a finite element model of the crankshaft system;
[0039] Based on the reference point, a connection relationship between the reference point and the crankshaft surface is established, a spring stiffness between the reference points is established, and a fixed constraint force is applied to the reference point.
[0040] In a third aspect, an embodiment of the present invention provides an electronic device, including:
[0041] at least one processor; and
[0042] at least one memory in communication with the processor, wherein:
[0043] The memory stores program instructions executable by the processor, and the processor calls the program instructions to execute the method as described in any one of the first aspects.
[0044] In a fourth aspect, an embodiment of the present invention provides a storage medium, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute any method described in the first aspect.
[0045] In the embodiment of the present invention, the overall modeling of the crankshaft system, the connection relationship between components and the modal vibration shape are taken into consideration at the same time, so that the simulation analysis results are more consistent with the actual test results. This can not only more realistically describe the contact between the crankshaft and the cylinder body, but also make the runout vibration shape of the flywheel at the end of the crankshaft system more consistent with the measured results, so that the influence of the runout vibration shape of the flywheel of each design scheme on the crankshaft system can be quickly verified, providing strong support for solving the problem of shaft knocking under idle charging conditions.
[0046] Furthermore, the embodiment of the present invention ensures that the model is comprehensive and the calculation results are accurate by adding parameters such as spring stiffness. The calculation results are highly consistent with the actual test results, which effectively saves design development and solution verification time and development costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0048] Figure 1 Shown is a flow chart of a crankshaft system modeling method provided in an embodiment of the present application;
[0049] Figure 2 The figure shows a schematic diagram of a finite element model after a connection is applied between a flywheel and a crankshaft bolt hole provided by an embodiment of the present invention;
[0050] Figure 3 The figure shows a schematic diagram of a finite element model of a crankshaft main journal and a second reference point connected according to an embodiment of the present invention;
[0051] Figure 4 The figure shows a schematic diagram of a finite element model for establishing a connection between a middle section main journal and a thrust bearing bearing surface provided by an embodiment of the present invention;
[0052] Figure 5 Shown is a structural schematic diagram of a crankshaft system modeling device provided in an embodiment of the present application;
[0053] Figure 6 Shown is a schematic structural diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION
[0054] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.
[0055] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0056] At present, in the process of automobile design and development, the problem of engine knocking occasionally occurs when the car is idling and charging. The problem of engine knocking will accelerate the wear of key components such as pistons and crankshafts, affect the stability and durability of the engine, shorten the life of the engine, and further lead to weakened vehicle power performance and increased fuel consumption.
[0057] The occurrence of engine knocking is closely related to the Atkinson cycle of hybrid vehicles and the bending mode of the crankshaft system. Therefore, in related technologies, optimizing the crankshaft main journal stiffness can reduce the probability of risk problems to a certain extent and mitigate the impact of risk problems. However, in the later stages of design and development, it is difficult to avoid the occurrence of risk problems by modifying the geometric design of the crankshaft, and there is no more effective means to quickly locate the root cause of the problem, which affects the progress of design and development.
[0058] Therefore, in order to solve the knocking problem of the engine crankshaft system under idle charging conditions, the embodiments of the present invention provide a crankshaft system modeling method, device and equipment. In the embodiments of the present invention, measures for optimizing the flywheel of the crankshaft system are proposed. By carrying flywheels of different specifications and using simulation analysis methods, the source of the knocking problem can be quickly located, and the effect of the optimization scheme on solving the problem can be quickly verified. This method is relatively more accurate, and the error between the simulation analysis results and the actual test results is <5%, which is conducive to solving the knocking problem under idle charging conditions and promoting project work development.
[0059] like Figure 1 FIG. 1 is a flow chart of a crankshaft system modeling method provided by an embodiment of the present invention. Figure 1 The specific steps of the method include:
[0060] S101, establishing a finite element model of the crankshaft system based on the three-dimensional model of the crankshaft system.
[0061] Specifically, in the established three-dimensional model of the crankshaft system, a first structure in the model is grid controlled by a preset first grid size, and a second structure in the model is divided by a preset second grid size.
[0062] Generally, the first structure is chamfers, fillets and process holes of specific sizes, and the second structure is 6-node triangular elements and 10-node tetrahedral elements.
[0063] In a specific embodiment, the first grid size is set to 3 mm, and the second grid size is set to 5 mm.
[0064] That is, the 3mm structural feature refined grid is used to control the grid of chamfers less than 5mm, fillets with a radius less than 5mm, and process holes with a diameter less than 12mm in the three-dimensional model of the crankshaft system; the 6-node triangular unit (Tri6) and the 10-node tetrahedral unit (Tet10) in the three-dimensional model of the crankshaft system are divided through a 5mm grid.
[0065] S102, obtaining a target crankshaft system model by creating a connection in the crankshaft system finite element model, creating a spring stiffness, and applying a fixed constraint force.
[0066] Specifically, a reference point is firstly established on the crankshaft of the crankshaft system finite element model.
[0067] When establishing reference points on the crankshaft, a first reference point is established at each bolt connection hole between the crankshaft and the flywheel. The number of the first reference points is determined by the number of the bolt connection holes.
[0068] In a specific embodiment, the crankshaft is connected to the flywheel through 8 bolt connection holes. The first reference points (RP-1 to RP-8) established at the centers of the 8 bolt connection holes are
[0069] A second reference point is established at the center of each non-middle section main journal of the crankshaft, and a third reference point is established along the axial direction of the crankshaft from the rear end of the crankshaft to the front end of the crankshaft based on the second reference point of each section main journal. In a specific embodiment, the third reference point is established at a distance of 5 mm from the second reference point. The number of the second reference point and the third reference point is determined by the number of the non-middle section main journals of the crankshaft.
[0070] A fourth reference point is established at the center of the middle section main journal of the crankshaft, and based on the fourth reference point of the middle section main journal, a fifth reference point is established in the axial direction from the rear end of the crankshaft to the front end of the crankshaft. In a specific embodiment, the fifth reference point is established at a distance of 5 mm from the fourth reference point.
[0071] In the above specific embodiment, the crankshaft includes five main journals, wherein the third section is the middle main journal. A second reference point (RP-9) and a third reference point (RP-10) are established at the center of the first main journal, a second reference point (RP-11) and a third reference point (RP-12) are established at the center of the second main journal, a fourth reference point (RP-13) and a fifth reference point (RP-14) are established at the center of the third main journal, a second reference point (RP-15) and a third reference point (RP-16) are established at the center of the fourth main journal, and a second reference point (RP-17) and a third reference point (RP-18) are established at the center of the fifth main journal.
[0072] After each reference point is established, a connection relationship between the reference point and the crankshaft surface is established based on the reference point to create a connection, a spring stiffness is created based on the reference point, and a fixed constraint force is applied based on the reference point.
[0073] When creating a connection, a connection relationship between each first reference point and the inner surface of the corresponding bolt hole is established.
[0074] In the above specific embodiment, the crankshaft and the flywheel are connected through 8 bolt connection holes. Based on the first reference points established at the centers of the 8 bolt connection holes, each first reference point is connected to the inner surface of the bolt hole. Figure 2 , which is a schematic diagram of a finite element model after a connection is applied between a flywheel and a crankshaft bolt hole provided by an embodiment of the present invention.
[0075] Establish a connection relationship between each second reference point and the outer surface of the crankshaft within the first preset range on the lower side of the main journal of the corresponding section. Generally, the first preset range is set to 120°, that is, the outer surface within 120° on the lower side of the main journal of the crankshaft section is connected to the second reference point (such as RP-9). Figure 3 , which is a schematic diagram of a finite element model of a crankshaft main journal and a second reference point provided in an embodiment of the present invention.
[0076] Establish a connection relationship between the fourth reference point and the inner and outer surfaces within the second preset range below the thrust bearing surfaces on both sides of the crankshaft main journal. Generally, the second preset range is set to 180°, that is, the fourth reference point (RP-13) at the center of the crankshaft main journal in the middle section is connected to the 180° surface below the thrust bearing surfaces on both sides. Figure 4 , which is a schematic diagram of a finite element model for establishing a connection between a middle section main journal and a thrust bearing bearing surface provided by an embodiment of the present invention.
[0077] Among them, the connection established between the reference point and the crankshaft surface is a rigid coupling connection (Coupling).
[0078] When creating the spring stiffness, you need to apply the spring stiffness to the reference point of the main journal of the non-middle section of the crankshaft and the reference point of the main journal of the middle section of the crankshaft respectively.
[0079] The radial spring stiffness is applied to the second reference point and the third reference point at the center of each non-middle section main journal of the crankshaft, and the axial spring stiffness is applied to the fourth reference point and the fifth reference point of the middle section main journal of the crankshaft.
[0080] When applying the fixed constraint force, a full fixed constraint force needs to be applied to each of the third reference points and the fifth reference points created to constrain the degrees of freedom of each of the third reference points and the fifth reference points in six directions.
[0081] In the above specific embodiment, a full fixed restraint force is applied to reference points RP-10, RP-12, RP-14, RP-16 and RP-18.
[0082] Optionally, in the embodiment of the present invention, the finite element software Abaqus for engineering simulation can be used to simulate the crankshaft system, and the create constraint function in Abaqus is used to create the connection in the finite element model of the crankshaft system, and the Springs / Dashpots function in Abaqus is used to create the spring stiffness.
[0083] S103, performing calculations using the target crankshaft system model to determine constraint modal values of the crankshaft system.
[0084] In the embodiment of the present invention, the overall modeling of the crankshaft system, the connection relationship between components and the modal vibration shape are taken into consideration at the same time, so that the simulation analysis results are more consistent with the actual test results. This can not only more realistically describe the contact between the crankshaft and the cylinder body, but also make the runout vibration shape of the flywheel at the end of the crankshaft system more consistent with the measured results, so that the influence of the runout vibration shape of the flywheel of each design scheme on the crankshaft system can be quickly verified, providing strong support for solving the problem of shaft knocking under idle charging conditions.
[0085] Furthermore, the embodiment of the present invention ensures that the model is comprehensive and the calculation results are accurate by adding parameters such as spring stiffness. The calculation results are highly consistent with the actual test results, which effectively saves design development and solution verification time and development costs.
[0086] Corresponding to the above crankshaft system modeling method, the present application embodiment also provides a crankshaft system modeling device. Figure 5 , is a structural schematic diagram of a crankshaft system modeling device provided in an embodiment of the present application. The crankshaft system modeling device may include: a first modeling module 501, a second modeling module 502 and a calculation module 503.
[0087] A first modeling module 501 is used to establish a finite element model of the crankshaft system based on the three-dimensional model of the crankshaft system;
[0088] A second modeling module 502 is configured to obtain a target crankshaft system model by creating a connection, creating a spring stiffness, and applying a fixed constraint force in the crankshaft system finite element model;
[0089] The calculation module 503 performs calculations using the target crankshaft system model to determine the constraint modal values of the crankshaft system.
[0090] Figure 6 FIG. 1 is a schematic diagram of the structure of an electronic device according to an embodiment of the present specification. Figure 6 As shown, the electronic device may include at least one processor; and at least one memory communicatively connected to the processing unit, wherein: the memory stores program instructions that can be executed by the processing unit, and the processor calls the program instructions to execute the crankshaft system modeling method provided in this embodiment.
[0091] The electronic device can be a device capable of intelligently communicating with a user, such as a cloud server, and the specific form of the electronic device is not limited in the embodiments of this specification. It can be understood that the electronic device here is the machine mentioned in the method embodiment.
[0092] Figure 6 A block diagram of an exemplary electronic device suitable for implementing the embodiments of the present description is shown. Figure 6 The electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of this specification.
[0093] like Figure 6 As shown, the electronic device is in the form of a general computing device. The components of the electronic device may include but are not limited to: one or more processors 610, a communication interface 620, a memory 630, and a communication bus 640 connecting different system components (including the memory 630, the communication interface 620 and the processor 610).
[0094] The communication bus 640 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processor or a local bus using any of a variety of bus structures. For example, these architectures include but are not limited to Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus and Peripheral Component Interconnection (PCI) bus.
[0095] Electronic devices typically include a variety of computer system readable media. These media can be any available media that can be accessed by the electronic device, including volatile and non-volatile media, removable and non-removable media.
[0096] The memory 630 may include a computer system readable medium in the form of a volatile memory, such as a random access memory (RAM) and / or a cache memory. The electronic device may further include other removable / non-removable, volatile / non-volatile computer system storage media. The memory 630 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of each embodiment of the present specification.
[0097] A program / utility having a set (at least one) of program modules may be stored in memory 630, such program modules including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment. The program modules generally perform the functions and / or methods of the embodiments described in this specification.
[0098] The processor 610 executes various functional applications and data processing by running the programs stored in the memory 630, such as implementing the crankshaft system modeling method provided in the embodiment shown in this specification.
[0099] An embodiment of the present specification provides a non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer instructions, wherein the computer instructions enable the computer to execute the crankshaft system modeling method provided by the embodiment shown in the present specification.
[0100] The above-mentioned non-transitory computer-readable storage medium can adopt any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, - but not limited to - an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (Read Only Memory; hereinafter referred to as: ROM), an erasable programmable read-only memory (Erasable Programmable Read Only Memory; hereinafter referred to as: EPROM) or flash memory, optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, a computer-readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.
[0101] Computer-readable signal media may include a data signal propagated in baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including, but not limited to, electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.
[0102] Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
[0103] Computer program code for performing the operations of this specification may be written in one or more programming languages or a combination thereof, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).
[0104] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
[0105] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this specification, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0106] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of this specification includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of this specification belong.
[0107] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.
[0108] It should be noted that the terminals involved in the embodiments of this specification may include but are not limited to personal computers (Personal Computer; hereinafter referred to as: PC), personal digital assistants (Personal Digital Assistant; hereinafter referred to as: PDA), wireless handheld devices, tablet computers (Tablet Computer), mobile phones, MP3 players, MP4 players, etc.
[0109] In the embodiments provided in this specification, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.
[0110] In addition, each functional unit in each embodiment of this specification may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional units.
[0111] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to perform some steps of the method described in each embodiment of this specification.
[0112] The above description is only a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this specification should be included in the scope of protection of this specification.
Claims
1. A crankshaft system modeling method, characterized in that: The method comprises: Establish a finite element model of the crankshaft system based on the three-dimensional model of the crankshaft system; A target crankshaft system model is obtained by creating a connection, creating a spring stiffness, and applying a fixed constraint force in the crankshaft system finite element model; Calculation is performed using the target crankshaft system model to determine constraint modal values of the crankshaft system.
2. The method according to claim 1, characterized in that The method of establishing a finite element model of the crankshaft system based on the three-dimensional model of the crankshaft system includes: Performing mesh control on a first structure in the three-dimensional model of the crankshaft system by using a preset first mesh size; Dividing a second structure in the three-dimensional model of the crankshaft system by a preset second grid size; The first structure is chamfers, fillets and process holes of specific sizes, and the second structure is 6-node triangular units and 10-node tetrahedral units.
3. The method according to claim 1, characterized in that The method of obtaining a target crankshaft system model by creating a connection, creating a spring stiffness, and applying a fixed constraint force in the crankshaft system finite element model includes: establishing a reference point on a crankshaft within a finite element model of the crankshaft system; Based on the reference point, a connection relationship between the reference point and the crankshaft surface is established, a spring stiffness between the reference points is established, and a fixed constraint force is applied to the reference point; Wherein, establishing a reference point on the crankshaft in the finite element model of the crankshaft system includes: Establishing first reference points at bolt connection holes of the crankshaft and the flywheel in the finite element model of the crankshaft system respectively; Establishing a second reference point at the center of each non-middle section main journal of the crankshaft; Based on each of the second reference points, a third reference point is established in the axial direction from the rear end of the crankshaft to the front end of the crankshaft along the crankshaft; Establishing a fourth reference point at the center of the main journal of the middle section of the crankshaft; Based on the fourth reference point, a fifth reference point is established in the axial direction from the rear end of the crankshaft to the front end of the crankshaft along the crankshaft.
4. The method according to claim 3, characterized in that Based on the reference point, establishing a connection relationship between the reference point and the crankshaft surface includes: Establishing a connection relationship between each of the first reference points and the inner surface of the corresponding bolt hole; Establishing a connection relationship between each of the second reference points and the inner and outer surfaces of the crankshaft within a first preset range on the lower side of the main journal of the corresponding section; Establishing a connection relationship between the fourth reference point and the inner and outer surfaces within a second preset range below the thrust bearing force surfaces on both sides of the main journal of the middle section of the crankshaft; The established connection relationship is a rigid coupling connection.
5. The method according to claim 3, characterized in that: Establishing a spring stiffness between the reference points based on the reference points includes: Applying radial spring stiffness to a second reference point and a third reference point at the center of each non-middle section main journal of the crankshaft; Axial spring stiffness is applied to a fourth reference point and a fifth reference point of the middle section main journal of the crankshaft.
6. The method according to claim 4, characterized in that Applying a fixed constraint force to the reference point based on the reference point includes: Applying a full fixed restraint force to each of the third reference point and the fifth reference point; The full fixed constraint force is used to constrain the degrees of freedom in six directions of each of the third reference point and the fifth reference point.
7. A crankshaft system modeling device, characterized in that: The device comprises: The first modeling module establishes a finite element model of the crankshaft system based on the three-dimensional model of the crankshaft system; A second modeling module obtains a target crankshaft system model by creating a connection, creating a spring stiffness, and applying a fixed constraint force in the crankshaft system finite element model; A calculation module is used to perform calculations using the target crankshaft system model to determine the constraint modal value of the crankshaft system.
8. The device according to claim 7, characterized in that the target crankshaft system model is obtained by creating a connection, creating a spring stiffness, and applying a fixed constraint force in the crankshaft system finite element model, comprising: establishing a reference point on a crankshaft within a finite element model of the crankshaft system; Based on the reference point, a connection relationship between the reference point and the crankshaft surface is established, a spring stiffness between the reference points is established, and a fixed constraint force is applied to the reference point.
9. An electronic device, characterized in that: include: at least one processor; as well as at least one memory in communication with the processor, wherein: The memory stores program instructions executable by the processor, and the processor can execute the method according to any one of claims 1 to 6 by calling the program instructions.
10. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the method according to any one of claims 1 to 6.