Abrasion evaluation method for squirrel cage elastic support dry friction damper under dynamic load and related device

Abstract

The invention discloses a mouse cage elastic support dry friction damper wear evaluation method under a dynamic load and a related device. The method comprises the following steps: applying a dynamic load boundary condition to a mouse cage elastic support dry friction damper finite element model; based on the finite element model of the squirrel-cage elastic support dry friction damper, carrying out influence analysis of dynamic load parameters on wear, respectively changing positive pressure, exciting force and rotating speed through simulation, and obtaining wear loss, contact stress and relative slippage distance change rules under the positive pressure, the exciting force and the rotating speed; based on a mouse cage elastic support dry friction damper finite element model, influence analysis of mouse cage structure parameters on abrasion is carried out, the Poisson's ratio, the elastic modulus and the rigidity of mouse cage elastic support are changed through simulation, and the influence rules of the Poisson's ratio, the elastic modulus and the rigidity on the abrasion loss and the mouse cage bar fillet stress are obtained; according to the method and the related device, the problem that the simulation precision of an existing dry friction damper wear scheme is insufficient can be solved.

Description

Technical Field

[0001] This invention belongs to the field of vibration reduction technology for aero-engine rotor systems, and relates to a method and related device for assessing the wear of a squirrel cage elastic support dry friction damper under dynamic load. Background Technology

[0002] To achieve a high thrust-to-weight ratio, modern aero-engine rotor systems generally employ flexible rotor structures. Their operating speeds are far higher than the first-order critical speed. During operation, the squirrel-cage elastic support dry friction damper must withstand the two-dimensional periodic alternating dynamic load transmitted by the rotor. The damper dissipates vibration energy through dry friction of the friction pair; however, under long-term dynamic loads, the friction pair is prone to micron-level fretting wear, leading to a decline in vibration reduction performance and even affecting the stability of the rotor system.

[0003] Wear alters the surface morphology, contact stiffness, and damping characteristics of the friction pair, leading to a gradual decline in vibration reduction performance. In severe cases, it can cause rotor system instability, threatening the safe operation of the aero-engine throughout its entire life cycle. Currently, wear assessment of elastic-supported dry friction dampers suffers from problems such as a disconnect between operating condition simulation and reality, insufficient simulation accuracy, and a lack of assessment systems. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method and related device for evaluating the wear of a squirrel cage elastic support dry friction damper under dynamic load. This method and related device can overcome the problem of insufficient simulation accuracy of existing dry friction damper wear schemes.

[0005] To achieve the above objectives, this invention discloses a method for evaluating the wear of a squirrel cage elastic support dry friction damper under dynamic load, comprising: Construct a finite element model of a rat cage elastically supported dry friction damper; Constructing the Arcard equations in the finite element model of a squirrel cage elastically supported dry friction damper; Dynamic load boundary conditions are applied to the finite element model of the squirrel cage elastic support dry friction damper; Based on the finite element model of the squirrel cage elastic support dry friction damper, the influence of dynamic load parameters on wear is analyzed. By simulation, the normal pressure, excitation force and rotation speed are changed respectively to obtain the variation law of wear, contact stress and relative slip distance under normal pressure, excitation force and rotation speed. Based on the finite element model of the squirrel cage elastic support dry friction damper, the influence of squirrel cage structural parameters on wear is analyzed. By simulation, the Poisson's ratio, elastic modulus and stiffness of the squirrel cage elastic support are changed respectively, and the influence law of Poisson's ratio, elastic modulus and stiffness on wear and squirrel cage bar fillet stress is obtained.

[0006] Furthermore, the finite element model of the squirrel cage elastic support dry friction damper includes the squirrel cage elastic support, dynamic friction plate, and static friction plate.

[0007] Furthermore, the process of constructing the finite element model of the squirrel cage elastic support dry friction damper is as follows: Based on the actual structure of the squirrel cage elastic support dry friction damper, a 1:1 finite element model of the squirrel cage elastic support dry friction damper was established using ANSYS software. The finite element model of the squirrel cage elastic support dry friction damper includes the squirrel cage elastic support, dynamic friction plate and static friction plate. Based on experimental data, the elastic modulus, Poisson's ratio, and density of the materials for the elastic support of the rat cage, the dynamic friction plate, and the static friction plate were determined. The finite element model of the squirrel cage elastic support dry friction damper was meshed and verified. The wear contact surface was meshed with a hexahedral mesh, and the rest was meshed with a tetrahedral mesh. Different mesh densities were set to verify mesh independence and determine the mesh size.

[0008] Furthermore, the expression for the Archard equation is:

[0009] in, Let be the wear depth of the nth node. For volume wear coefficient, Let n be the contact stress at node n in the i-th increment step. Let n be the relative slip increment of the nth node in the i-th increment step.

[0010] Furthermore, the process of applying dynamic load boundary conditions to the finite element model of the squirrel cage elastic support dry friction damper is as follows: To simulate the cyclic alternating load on the rotor, two sets of sinusoidal excitation forces with perpendicular directions and a 90° phase difference are applied to the radial hole at the top of the squirrel cage elastic support, with the frequency corresponding to the rotor speed. A uniformly distributed normal force is applied to the top of the static friction plate, covering the critical value of the transition from slip to viscosity of the friction pair. Contact parameters and the friction coefficient between the friction pairs are set, and the dry friction contact behavior is simulated using the Coulomb friction model. A fixed constraint is applied to the bottom of the squirrel cage elastic support to restrict its displacement and rotation, and constraints are added to the static friction plate to make it move only in the axial direction.

[0011] Furthermore, the process of obtaining the variation laws of wear, contact stress, and relative slip distance under normal pressure, excitation force, and rotational speed by simulating the changes in normal pressure, excitation force, and rotational speed is as follows: Keeping the magnitude and frequency of the excitation force constant, the magnitude of the top normal pressure is changed, and the wear amount and contact state are obtained through simulation. Keeping the magnitude of the normal force and the frequency of the excitation force constant, the magnitude of the excitation force is changed, and the wear amount and contact state are obtained through simulation. Keeping the magnitude of the excitation force and the magnitude of the top normal pressure constant, the frequency of the excitation force is changed to simulate and obtain the amount of wear and the contact state.

[0012] Furthermore, the process of obtaining the variation laws of wear, contact stress, and relative slip distance under normal pressure, excitation force, and rotational speed by simulating the changes in normal pressure, excitation force, and rotational speed is as follows: By keeping the stiffness and elastic modulus of the materials used in the rat cage constant, and changing the Poisson's ratio, the wear amount and the stress at the fillet radius of the cage bars can be obtained through simulation. Keeping the stiffness and Poisson's ratio of the materials used in the rat cage constant, the elastic modulus is changed, and the wear amount and cage bar fillet stress are obtained through simulation. Keeping the Poisson's ratio and elastic modulus of the material used in the cage constant, the stiffness is varied, and the wear and stress at the rounded corners of the cage bars are obtained through simulation.

[0013] This invention discloses a wear assessment system for a squirrel cage elastic support dry friction damper under dynamic load, comprising: The first building module is used to build the finite element model of the squirrel cage elastic support dry friction damper; The second building module is used to construct the Arcard equations in the finite element model of the squirrel cage elastic support dry friction damper. An application module is used to apply dynamic load boundary conditions to the finite element model of the squirrel cage elastic support dry friction damper. The first simulation module is used to conduct dynamic load parameter analysis on wear based on the finite element model of the squirrel cage elastic support dry friction damper. By simulating the normal pressure, excitation force and rotation speed, the module obtains the variation law of wear amount, contact stress and relative slip distance under normal pressure, excitation force and rotation speed. The second simulation module is used to analyze the influence of squirrel cage structural parameters on wear based on the finite element model of the squirrel cage elastic support dry friction damper. By changing the Poisson's ratio, elastic modulus and stiffness of the squirrel cage elastic support through simulation, the influence of Poisson's ratio, elastic modulus and stiffness on wear and squirrel cage bar fillet stress is obtained.

[0014] This invention discloses a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the wear assessment method for a squirrel cage elastic support dry friction damper under dynamic load.

[0015] This invention discloses a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the wear assessment method for a squirrel cage elastic support dry friction damper under dynamic load.

[0016] The present invention has the following beneficial effects: The wear assessment method and related device for a squirrel-cage elastic support dry friction damper under dynamic load described in this invention, in specific operation, analyzes the influence of dynamic load parameters on wear based on the finite element model of the squirrel-cage elastic support dry friction damper. Through simulation, the wear amount, contact stress, and relative slip distance are obtained by changing the normal pressure, excitation force, and rotational speed under different conditions. Based on the finite element model of the squirrel-cage elastic support dry friction damper, the influence of squirrel cage structural parameters on wear is analyzed. Through simulation, the Poisson's ratio, elastic modulus, and stiffness of the squirrel-cage elastic support are changed to obtain the influence of Poisson's ratio, elastic modulus, and stiffness on the wear amount and the stress at the rounded corners of the squirrel cage bars. This overcomes the problem of insufficient simulation accuracy in existing dry friction damper wear schemes and is highly practical. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart of the method of the present invention; Figure 2 This is a schematic diagram of the mesh generation for the finite element simulation of the elastic support of the mouse cage. Figure 3 This is a schematic diagram of the mesh generation for finite element simulation of the contact surface of a static friction plate. Figure 4 This is a graph showing the effect of normal pressure on wear under dynamic load. Figure 5 A graph showing the effect of the magnitude of the excitation force on the amount of wear under dynamic load; Figure 6 This is a graph showing the effect of rotational speed on wear under dynamic load. Figure 7 The graph shows the effect of Poisson's ratio of the squirrel cage on wear under dynamic load. Figure 8 The graph shows the effect of Poisson's ratio of the squirrel cage on the equivalent stress of the squirrel cage fillet under dynamic load. Figure 9 The graph shows the effect of the elastic modulus of the squirrel cage on the wear amount under dynamic load. Figure 10 This is a graph showing the effect of the elastic modulus of the squirrel cage on the equivalent stress of the squirrel cage fillet under dynamic load. Figure 11 The graph shows the effect of cage stiffness on wear under dynamic load. Figure 12 This is a graph showing the effect of cage stiffness on the equivalent stress of cage fillet radius under dynamic load. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0021] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0022] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this invention generally indicates that the preceding and following objects have an "or" relationship.

[0023] It should be understood that although terms such as first, second, third, etc., may be used in the embodiments of the present invention to describe the preset range, these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from one another. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0024] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0027] Example 1 refer to Figures 1 to 12 The wear assessment method for a squirrel cage elastic support dry friction damper under dynamic load as described in this invention includes the following steps: 1) Construct a finite element model of a squirrel cage elastic support dry friction damper, wherein the finite element model of the squirrel cage elastic support dry friction damper includes a squirrel cage elastic support, a dynamic friction plate and a static friction plate; 2) Construct the Archard equations in the finite element model of the squirrel cage elastic support dry friction damper, and discretize the traditional Archard equations into a nodal incremental form; 3) Apply dynamic load boundary conditions to the finite element model of the squirrel cage elastic support dry friction damper. Specifically, apply a two-dimensional orthogonal sinusoidal excitation force with a phase difference of 90° to the top of the squirrel cage elastic support to simulate the rotor's periodic alternating load, apply normal pressure to the static friction plate, and set the friction coefficient. 4) Based on the finite element model of the squirrel cage elastic support dry friction damper, the influence of dynamic load parameters on wear is analyzed. By changing the normal force, excitation force and rotation speed through simulation, the wear amount, contact stress and relative slip distance under each parameter are obtained. 5) Based on the finite element model of the squirrel cage elastic support dry friction damper, the influence of squirrel cage structural parameters on wear is analyzed. By simulation, the Poisson's ratio, elastic modulus, and stiffness of the squirrel cage elastic support are changed respectively to obtain the influence law of each parameter on the wear amount and the stress of the squirrel cage bar fillet.

[0028] The specific process of step 1) is as follows: 11) Based on the actual structure of the squirrel cage elastic support dry friction damper, a 1:1 finite element model of the squirrel cage elastic support dry friction damper was established using ANSYS software. The finite element model of the squirrel cage elastic support dry friction damper includes the squirrel cage elastic support, dynamic friction plate and static friction plate. 12) Based on the experimental data, the material parameters were set to obtain the elastic modulus, Poisson's ratio and density settings of the materials for the elastic support of the squirrel cage, the dynamic friction plate and the static friction plate; 13) Mesh generation and verification were performed on the finite element model of the squirrel cage elastic support dry friction damper. The wear contact surface was meshed with a hexahedral mesh, and the remaining parts were meshed with a tetrahedral mesh. Different mesh densities were set to verify mesh independence and determine the mesh size.

[0029] Specifically, in step 11), the elastic support for the rat cage has a cage bar length of 103 mm and a stiffness of 7.53 × 10⁻⁶. 5 N / m, number of cage bars: 8, width: 4mm, thickness: 4mm.

[0030] Specifically, in step 12), the elastic support material used for the squirrel cage is 65Mn, with an elastic modulus of 197.5 GPa, a Poisson's ratio of 0.288, and a density of 7820 kg / m³. 3 The dynamic friction pad is made of 45# steel, with an elastic modulus of 200 GPa, Poisson's ratio of 0.3, and a density of 7800 kg / m³. 3 The static friction pad material is HT62, with an elastic modulus of 122 GPa, Poisson's ratio of 0.34, and a density of 8400 kg / m³. 3 .

[0031] Specifically, in step 13), the mesh independence verification selects a mesh size of 3-10 mm to verify the normal stress of the contact surface under the unit normal pressure, and finally selects a 5 mm mesh size for simulation.

[0032] Specifically, in step 2), the Archard equation is modified and discretized into a nodal incremental form, expressed as:

[0033] in, Let be the wear depth of the nth node. For volume wear coefficient, Let n be the contact stress at node n in the i-th increment step. Let n be the relative slip increment of the nth node in the i-th increment step; Specifically, in step 3), the specific operation for applying dynamic load boundary conditions to analyze the wear effect is as follows: 31) Simulate the rotor's periodic alternating load by applying two sets of sinusoidal excitation forces with mutually perpendicular directions and a 90° phase difference at the top radial circular hole of the squirrel cage elastic support, with the frequency corresponding to the rotor speed; 32) Apply a uniformly distributed normal force to the top of the static friction plate, covering the critical value of the transition from slip to viscosity of the friction pair; 33) Set the contact parameters and the friction coefficient between the friction pairs, and use the Coulomb friction model to simulate dry friction contact behavior; apply a fixed constraint to the bottom of the squirrel cage elastic support to restrict its displacement and rotation, and add constraints to the static friction plate to make it move only in the axial direction.

[0034] Specifically, in step 33), the coefficient of friction used is fixed at 0.2.

[0035] Specifically, in step 4), the process of applying different dynamic load boundary conditions to analyze the wear effect is as follows: 41) Keep the magnitude and frequency of the excitation force constant, change the magnitude of the top normal pressure, and simulate to obtain the wear amount and contact state; 42) Keeping the magnitude of the normal force and the frequency of the excitation force constant, change the magnitude of the excitation force and simulate to obtain the wear amount and contact state; 43) Keeping the magnitude of the excitation force and the magnitude of the top normal pressure constant, change the frequency of the excitation force and simulate to obtain the amount of wear and contact state; Specifically, in step 41), the normal pressure varies from 40N to 70N, the excitation frequency is 50Hz, and the excitation force is 10N.

[0036] Specifically, in step 42), the excitation force varies from 6 to 13 N, with a normal pressure of 50 N and an excitation frequency of 50 Hz.

[0037] Specifically, in step 43), the rotational speed range is 1000-6000 r·min. -1 The corresponding excitation frequency is 16.7-100Hz, at which time the excitation force is 10N and the normal force is 50N.

[0038] Specifically, in step 5), the process of applying different cage structural parameters to analyze the effect of wear is as follows: 51) Keeping the stiffness and elastic modulus of the materials used in the rat cage constant, the Poisson's ratio is changed, and the wear amount and cage bar fillet stress are obtained by simulation. All material parameters are shown in Table 1.

[0039] Table 1

[0040] 52) Keep the stiffness and Poisson's ratio of the materials used in the rat cage constant, change the elastic modulus, and simulate to obtain the wear amount and cage bar fillet stress. All material parameters are shown in Table 2.

[0041] Table 2

[0042] 53) Keep the Poisson's ratio and elastic modulus of the material used in the cage constant, change the stiffness, and simulate to obtain the wear amount and cage bar fillet stress.

[0043] Specifically, in step 53), the stiffness of the cage is changed without changing the material. The stiffness is changed by changing the length of the cage bars, and the parameters are shown in Table 3.

[0044] Table 3

[0045] Example 2 The wear assessment system for a squirrel cage elastic support dry friction damper under dynamic load as described in this invention includes: The first building module is used to build the finite element model of the squirrel cage elastic support dry friction damper; The second building module is used to construct the Arcard equations in the finite element model of the squirrel cage elastic support dry friction damper. An application module is used to apply dynamic load boundary conditions to the finite element model of the squirrel cage elastic support dry friction damper. The first simulation module is used to conduct dynamic load parameter analysis on wear based on the finite element model of the squirrel cage elastic support dry friction damper. By simulating the normal pressure, excitation force and rotation speed, the module obtains the variation law of wear amount, contact stress and relative slip distance under normal pressure, excitation force and rotation speed. The second simulation module is used to analyze the influence of squirrel cage structural parameters on wear based on the finite element model of the squirrel cage elastic support dry friction damper. By changing the Poisson's ratio, elastic modulus and stiffness of the squirrel cage elastic support through simulation, the influence of Poisson's ratio, elastic modulus and stiffness on wear and squirrel cage bar fillet stress is obtained.

[0046] The module division in this embodiment is illustrative and represents only one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional modules in each embodiment of this application can be integrated into a single processor, exist as separate physical entities, or be integrated into a single module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0047] Example 3 A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of a method for evaluating the wear of a squirrel-cage elastic support dry friction damper under dynamic load. For example, the method includes: constructing a finite element model of the squirrel-cage elastic support dry friction damper; constructing the Arcard equation in the finite element model of the squirrel-cage elastic support dry friction damper; applying dynamic load boundary conditions to the finite element model of the squirrel-cage elastic support dry friction damper; based on the finite element model of the squirrel-cage elastic support dry friction damper, conducting an analysis of the influence of dynamic load parameters on wear, and obtaining the variation laws of wear amount, contact stress, and relative slip distance under normal pressure, excitation force, and rotational speed by simulation of changing the normal pressure, excitation force, and rotational speed respectively; based on the finite element model of the squirrel-cage elastic support dry friction damper, conducting an analysis of the influence of squirrel cage structural parameters on wear, and obtaining the influence laws of Poisson's ratio, elastic modulus, and stiffness of the squirrel cage elastic support on wear amount and squirrel cage bar fillet stress by simulation of changing the Poisson's ratio, elastic modulus, and stiffness respectively. The memory may include main memory, such as high-speed random access memory (RAM), or non-volatile memory, such as at least one disk storage device. The processor, network interface, and memory are interconnected via an internal bus, which may be an industry-standard architecture bus, a peripheral component interconnection standard bus, or an extended industry-standard architecture bus. The bus can be categorized as an address bus, data bus, or control bus. The memory stores programs; specifically, the program may include program code, which includes computer operation instructions. The memory may include main memory and non-volatile memory, and provides instructions and data to the processor.

[0048] Example 4 A computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of a method for evaluating the wear of a squirrel-cage elastic support dry friction damper under dynamic load. For example, the method includes: constructing a finite element model of the squirrel-cage elastic support dry friction damper; constructing the Arcard equations in the finite element model of the squirrel-cage elastic support dry friction damper; applying dynamic load boundary conditions to the finite element model of the squirrel-cage elastic support dry friction damper; based on the finite element model of the squirrel-cage elastic support dry friction damper, conducting an analysis of the influence of dynamic load parameters on wear, and obtaining the variation laws of wear amount, contact stress, and relative slip distance under normal pressure, excitation force, and rotational speed by simulation of changing the normal pressure, excitation force, and rotational speed respectively; and based on the finite element model of the squirrel-cage elastic support dry friction damper, conducting an analysis of the influence of squirrel cage structural parameters on wear, and obtaining the influence laws of Poisson's ratio, elastic modulus, and stiffness of the squirrel cage elastic support on wear amount and squirrel cage bar fillet stress by simulation of changing the Poisson's ratio, elastic modulus, and stiffness respectively. Specifically, the computer-readable storage medium includes, but is not limited to, volatile memory and / or non-volatile memory. The volatile memory may include random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include read-only memory (ROM), hard disk, flash memory, optical disk, magnetic disk, etc.

[0049] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0050] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0051] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0052] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0053] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0054] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

[0055] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for evaluating the wear of a squirrel cage elastically supported dry friction damper under dynamic load, characterized in that, include: Construct a finite element model of a rat cage elastically supported dry friction damper; Constructing the Arcard equations in the finite element model of a squirrel cage elastically supported dry friction damper; Dynamic load boundary conditions are applied to the finite element model of the squirrel cage elastic support dry friction damper; Based on the finite element model of the squirrel cage elastic support dry friction damper, the influence of dynamic load parameters on wear is analyzed. By simulation, the normal pressure, excitation force and rotation speed are changed respectively to obtain the variation law of wear, contact stress and relative slip distance under normal pressure, excitation force and rotation speed. Based on the finite element model of the squirrel cage elastic support dry friction damper, the influence of squirrel cage structural parameters on wear is analyzed. By simulation, the Poisson's ratio, elastic modulus and stiffness of the squirrel cage elastic support are changed respectively, and the influence law of Poisson's ratio, elastic modulus and stiffness on wear and squirrel cage bar fillet stress is obtained.

2. The wear assessment method for a squirrel cage elastic support dry friction damper under dynamic load according to claim 1, characterized in that, The finite element model of the squirrel cage elastic support dry friction damper includes the squirrel cage elastic support, dynamic friction plate and static friction plate.

3. The wear assessment method for a squirrel cage elastic support dry friction damper under dynamic load according to claim 1, characterized in that, The process of constructing the finite element model of the squirrel cage elastic support dry friction damper is as follows: Based on the actual structure of the squirrel cage elastic support dry friction damper, a 1:1 finite element model of the squirrel cage elastic support dry friction damper was established using ANSYS software. The finite element model of the squirrel cage elastic support dry friction damper includes the squirrel cage elastic support, dynamic friction plate and static friction plate. Based on experimental data, the elastic modulus, Poisson's ratio, and density of the materials for the elastic support of the rat cage, the dynamic friction plate, and the static friction plate were determined. The finite element model of the squirrel cage elastic support dry friction damper was meshed and verified. The wear contact surface was meshed with a hexahedral mesh, and the rest was meshed with a tetrahedral mesh. Different mesh densities were set to verify mesh independence and determine the mesh size.

4. The wear assessment method for a squirrel cage elastic support dry friction damper under dynamic load according to claim 1, characterized in that, The expression for the Archard equation is: in, Let be the wear depth of the nth node. For volume wear coefficient, Let n be the contact stress at node n in the i-th increment step. Let n be the relative slip increment of the nth node in the i-th increment step.

5. The wear assessment method for a squirrel cage elastic support dry friction damper under dynamic load according to claim 3, characterized in that, The process of applying dynamic load boundary conditions to the finite element model of the squirrel cage elastic support dry friction damper is as follows: To simulate the cyclic alternating load on the rotor, two sets of sinusoidal excitation forces with mutually perpendicular directions and a 90° phase difference are applied at the top radial circular hole of the squirrel cage elastic support, with the frequency corresponding to the rotor speed; a uniformly distributed normal force is applied to the top of the static friction plate, covering the critical value of the transition of the friction pair from slip to viscosity. The contact parameters and friction coefficients between the friction pairs are set, and the dry friction contact behavior is simulated using the Coulomb friction model. A fixed constraint is applied to the bottom of the squirrel cage elastic support to restrict its displacement and rotation, and constraints are added to the static friction plate to make it move only in the axial direction.

6. The wear assessment method for a squirrel cage elastic support dry friction damper under dynamic load according to claim 5, characterized in that, The process of obtaining the variation law of wear, contact stress and relative slip distance under normal pressure, excitation force and rotation speed by simulating the changes of normal pressure, excitation force and rotation speed respectively is as follows: Keeping the magnitude and frequency of the excitation force constant, the magnitude of the top normal pressure is changed, and the wear amount and contact state are obtained through simulation. Keeping the magnitude of the normal force and the frequency of the excitation force constant, the magnitude of the excitation force is changed, and the wear amount and contact state are obtained through simulation. Keeping the magnitude of the excitation force and the magnitude of the top normal pressure constant, the frequency of the excitation force is changed to simulate and obtain the amount of wear and the contact state.

7. The wear assessment method for a squirrel cage elastic support dry friction damper under dynamic load according to claim 6, characterized in that, The process of obtaining the variation law of wear, contact stress and relative slip distance under normal pressure, excitation force and rotation speed by simulating the changes of normal pressure, excitation force and rotation speed respectively is as follows: By keeping the stiffness and elastic modulus of the materials used in the rat cage constant, and changing the Poisson's ratio, the wear amount and the stress at the fillet radius of the cage bars can be obtained through simulation. Keeping the stiffness and Poisson's ratio of the materials used in the rat cage constant, the elastic modulus is changed, and the wear amount and cage bar fillet stress are obtained through simulation. Keeping the Poisson's ratio and elastic modulus of the material used in the cage constant, the stiffness is varied, and the wear and stress at the rounded corners of the cage bars are obtained through simulation.

8. A wear assessment system for a squirrel cage elastic support dry friction damper under dynamic load, characterized in that, include: The first building module is used to build the finite element model of the squirrel cage elastic support dry friction damper; The second building module is used to construct the Arcard equations in the finite element model of the squirrel cage elastic support dry friction damper. An application module is used to apply dynamic load boundary conditions to the finite element model of the squirrel cage elastic support dry friction damper. The first simulation module is used to conduct dynamic load parameter analysis on wear based on the finite element model of the squirrel cage elastic support dry friction damper. By simulating the normal pressure, excitation force and rotation speed, the module obtains the variation law of wear amount, contact stress and relative slip distance under normal pressure, excitation force and rotation speed. The second simulation module is used to analyze the influence of squirrel cage structural parameters on wear based on the finite element model of the squirrel cage elastic support dry friction damper. By changing the Poisson's ratio, elastic modulus and stiffness of the squirrel cage elastic support through simulation, the influence of Poisson's ratio, elastic modulus and stiffness on wear and squirrel cage bar fillet stress is obtained.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the wear assessment method for a squirrel cage elastic support dry friction damper under dynamic load as described in any one of claims 1-7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the wear assessment method for a squirrel cage elastic support dry friction damper under dynamic load as described in any one of claims 1-7.

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