Vibration reduction design method and system for bearing common cavity structure, electronic equipment, and storage medium

Abstract

The present invention discloses a vibration reduction design method and system, electronic equipment, and storage medium for a bearing common cavity structure. The method first constructs a power flow model and a finite element model, then performs vibration excitation simulation to obtain power flow data to generate a power flow vector diagram, and performs vibration energy transfer analysis to determine the optimized components, then determines the optimized design direction of the optimized components, and finally determines the vibration reduction optimization design scheme of the optimized parts. The method uses vibration power flow to accurately reflect the vibration magnitude, and uses finite element power flow analysis and generates a power flow vector diagram to accurately reflect the transmission path of the vibration, and can also quickly determine the key parts that affect the vibration energy transfer and consumption of the bearing common cavity structure, and then analyzes the power flow influencing factors of the key components to determine the optimized design direction of the optimized components, which greatly reduces the calculation amount, design cycle, and design cost of the structural optimization design, and greatly improves the vibration reduction effect.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration reduction design, and in particular to a vibration reduction design method and system for a bearing common cavity structure, electronic equipment, and a computer-readable storage medium. Background Art

[0002] In recent years, the bearing co-cavity structure has been widely used in rotary engines. Since the bearing co-cavity structure directly bears and transmits the vibration of the rotor system, when the vibration reduction design of the rotor system is carried out, the bearing co-cavity structure is generally optimized to achieve the purpose of vibration reduction of the rotor system. When the vibration reduction design of the bearing co-cavity structure is carried out, the traditional structural vibration description method mainly uses physical quantities such as vibration force, vibration displacement, and vibration velocity. However, the propagation of vibration is transmitted in the form of energy. The energy in the structure includes kinetic energy and potential energy. If the traditional physical quantity is used to measure the vibration, it cannot accurately reflect the magnitude of the vibration, resulting in unsatisfactory vibration reduction effect of the bearing co-cavity structure. Summary of the invention

[0003] The present invention provides a vibration reduction design method and system for a bearing common cavity structure, an electronic device, and a computer-readable storage medium, which can accurately reflect the vibration size and the vibration transmission path, and can also quickly determine the key parts that affect the vibration energy transmission and consumption of the bearing common cavity structure and their optimization design directions, greatly reducing the calculation amount, design cycle and design cost of the structural optimization design, and greatly improving the vibration reduction effect.

[0004] According to one aspect of the present invention, a vibration reduction design method for a bearing common cavity structure is provided, comprising the following contents:

[0005] Construct the finite element model of power flow model and bearing common cavity structure;

[0006] Apply vibration excitation to the finite element model based on the sensitive excitation frequency of the bearing common cavity structure, calculate the power flow data of the finite element model under vibration excitation based on the power flow model to generate a power flow vector diagram, and perform vibration energy transfer analysis on the power flow vector diagram to determine the optimized components;

[0007] Analyze the factors affecting the power flow of the optimized components and determine the optimization design direction of the optimized components;

[0008] Determine the vibration reduction optimization design scheme for the optimized part based on the optimization design direction.

[0009] Furthermore, the power flow model is:

[0010] ;

[0011] Among them, p xrepresents the power flow in the x direction, p y represents the power flow in the y direction, p z represents the power flow in the z direction, Represents the normal as The upper edge of the axis Shear stress in the direction Represents the normal as The shear stress in the z direction on the plane of the axis, represents the shear stress along the x direction on the plane whose normal is the y axis, represents the shear stress along the z direction on the plane whose normal is the y axis, represents the shear stress along the x direction on the plane whose normal is the z axis, represents the shear stress along the y direction on the plane whose normal is the z axis, , , They represent the conjugate of the normal x, y, and z directions, respectively. , , They represent the normal stress in the normal x, y, and z directions respectively, Im() represents the imaginary part of the complex number, and ω represents the circular frequency of vibration.

[0012] Furthermore, the power flow data includes the power flow amplitude and the power flow direction, which are calculated based on the following formula:

[0013] ;

[0014] ;

[0015] ;

[0016] ;

[0017] Among them, p x represents the power flow in the x direction, p y represents the power flow in the y direction, p z represents the power flow in the z direction, represents the total power flow amplitude flowing through a unit in the finite element model, , and They represent the angles between the total power flow direction and the x-axis, y-axis and z-axis respectively.

[0018] Furthermore, the optimized components include an outer casing and a fold-back structure.

[0019] Furthermore, the optimization design directions include increasing the elastic modulus of the foldback structure and the outer casing, and destroying the local power flow closed loop.

[0020] Furthermore, the process of determining the vibration reduction optimization design scheme of the optimized part based on the optimization design direction includes the following contents:

[0021] An opening structure is designed on the mounting edge of the outer casing, and a circle of elliptical holes is arranged circumferentially on the cylindrical surface of the outer casing. The number of elliptical holes and the ratio of the minor diameter to the major diameter are used as design variables, and the minimization of the total power flow amplitude transmitted to the mounting edge of the outer casing is used as the optimization objective function. A genetic algorithm is used for iterative solution to obtain the first set of vibration reduction optimization design solutions.

[0022] Furthermore, the process of determining the vibration reduction optimization design scheme of the optimized part based on the optimization design direction includes the following contents:

[0023] Ribs were added to the foldable structure and the surface of the outer casing. The number and thickness of the ribs were used as design variables, and the minimization of the total power flow amplitude transmitted to the mounting edge of the outer casing was used as the optimization objective function. Genetic algorithm was used for iterative solution to obtain the second set of vibration reduction optimization design schemes.

[0024] In addition, the present invention also provides a vibration reduction design system for a bearing common cavity structure, comprising:

[0025] Model building module, used to build the finite element model of the power flow model and the bearing common cavity structure;

[0026] An optimized component determination module is used to apply vibration excitation in the finite element model based on the sensitive excitation frequency of the bearing common cavity structure, calculate the power flow data of the finite element model under vibration excitation based on the power flow model to generate a power flow vector diagram, and perform vibration energy transfer analysis on the power flow vector diagram to determine the optimized component;

[0027] An optimization direction determination module is used to analyze the factors affecting the power flow of the optimized component and determine the optimization design direction of the optimized component;

[0028] The vibration reduction optimization design module is used to determine the vibration reduction optimization design scheme of the optimized part based on the optimization design direction.

[0029] In addition, the present invention also provides an electronic device, including a processor and a memory, wherein the memory stores a computer program, and the processor executes the steps of the above method by calling the computer program stored in the memory.

[0030] In addition, the present invention also provides a computer-readable storage medium for storing a computer program for performing vibration reduction design on a bearing common cavity structure, wherein the computer program executes the steps of the method described above when running on a computer.

[0031] The present invention has the following beneficial effects:

[0032] The vibration reduction design method of the bearing common cavity structure of the present invention first constructs a power flow model and a finite element model of the bearing common cavity structure, then performs vibration excitation simulation and calculates the power flow data of the finite element model under vibration excitation based on the power flow model to generate a power flow vector diagram, and performs vibration energy transfer analysis on the power flow vector diagram to determine the optimized component. Then, the power flow influencing factors of the optimized component are analyzed to determine the optimized design direction of the optimized component, and finally, the vibration reduction optimization design scheme of the optimized part is determined according to the optimized design direction to reduce the external vibration. Since the vibration power flow describes the instantaneous energy in the process of structural vibration transmission, it can accurately reflect the vibration size, and the finite element power flow analysis is used to generate the power flow vector diagram, which can accurately reflect the transmission path of the vibration, and can also quickly determine the key parts that affect the vibration energy transmission and consumption of the bearing common cavity structure, and then the power flow influencing factors of the key components are analyzed to determine the optimized design direction of the optimized component, which greatly reduces the calculation amount, design cycle and design cost of the structural optimization design, and greatly improves the vibration reduction effect.

[0033] In addition, the vibration reduction design system of the bearing common cavity structure of the present invention also has the above advantages.

[0034] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0036] Figure 1 It is a flow chart of a vibration reduction design method for a bearing common cavity structure according to a preferred embodiment of the present application;

[0037] Figure 2 It is a structural schematic diagram of the bearing common cavity structure;

[0038] Figure 3 is a schematic diagram of a finite element mesh model of a bearing common cavity structure constructed in a preferred embodiment of the present application;

[0039] Figure 4 is a power flow vector diagram of a preferred embodiment of the present application when displacement excitation is applied at the first support at the first natural frequency;

[0040] Figure 5 is a power flow vector diagram of applying displacement excitation at the third support at the first-order natural frequency in the preferred embodiment of the present application;

[0041] Figure 6is a power flow vector diagram of applying displacement excitation at the first support at the second-order natural frequency in the preferred embodiment of the present application;

[0042] Figure 7 is a power flow vector diagram of applying displacement excitation at the third support at the second-order natural frequency in the preferred embodiment of the present application;

[0043] Figure 8 It is a schematic diagram of a closed loop of power flow at the inner and outer casings in a preferred embodiment of the present application;

[0044] Fig. 9 It is a schematic diagram of a vibration reduction optimization design scheme using an opening method in a certain embodiment of the present application;

[0045] Fig.10 is a schematic diagram of a final vibration reduction optimization design solution of a certain embodiment of the present application;

[0046] Fig.11 It is a schematic diagram of the module structure of a vibration reduction design system for a bearing common cavity structure according to another embodiment of the present application.

[0047] Description of Reference Numerals

[0048] 1. First elastic support; 2. Second elastic support; 3. Third elastic support; 4. First support seat; 5. Second support seat; 6. Folding structure; 7. Inner casing; 8. Support plate; 9. Outer casing; 10. Outer casing mounting edge. DETAILED DESCRIPTION

[0049] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0050] Reference Figure 1 As shown, the preferred embodiment of the present application provides a vibration reduction design method for a bearing common cavity structure, comprising the following contents:

[0051] Step S1: construct a power flow model and a finite element model of a bearing common cavity structure;

[0052] Step S2: applying vibration excitation in the finite element model based on the sensitive excitation frequency of the bearing common cavity structure, calculating the power flow data of the finite element model under vibration excitation based on the power flow model to generate a power flow vector diagram, and performing vibration energy transfer analysis on the power flow vector diagram to determine the optimized components;

[0053] Step S3: Analyze the factors affecting the power flow of the optimized component and determine the optimization design direction of the optimized component;

[0054] Step S4: Determine the vibration reduction optimization design scheme of the optimization part based on the optimization design direction.

[0055] It can be understood that the vibration reduction design method of the bearing common cavity structure of this embodiment first constructs a power flow model and a finite element model of the bearing common cavity structure, then performs vibration excitation simulation and calculates the power flow data of the finite element model under vibration excitation based on the power flow model to generate a power flow vector diagram, and performs vibration energy transfer analysis on the power flow vector diagram to determine the optimized component. Then, the power flow influencing factors of the optimized component are analyzed to determine the optimized design direction of the optimized component. Finally, the vibration reduction optimization design scheme of the optimized part is determined according to the optimized design direction to reduce the external vibration. Since the vibration power flow describes the instantaneous energy in the process of structural vibration transmission, it can accurately reflect the vibration size, and the finite element power flow analysis and power flow vector diagram generation can accurately reflect the transmission path of the vibration, and can also quickly determine the key parts that affect the vibration energy transmission and consumption of the bearing common cavity structure, and then analyze the power flow influencing factors of the key components to determine the optimized design direction of the optimized components, which greatly reduces the calculation amount, design cycle and design cost of the structural optimization design, and greatly improves the vibration reduction effect.

[0056] It can be understood that in step S1, the vibration power flow describes the instantaneous energy in the process of structural vibration transmission. The power flow is the product of the vibration force and velocity in the structure, and the vibration force includes the vibration normal stress and shear stress, which reflects the potential energy in the structure, and the velocity in the structure reflects the magnitude of the kinetic energy of each particle in the structure. The vibration power flow represents the magnitude of the vibration energy per unit time. The power flow after visualization also includes the flow direction of the vibration energy per unit time at the next moment. Therefore, the power flow can reflect the transmission path of the vibration. The position of the vibration source and the transmission process of the vibration energy can be judged based on the power flow. The vibration isolation effect of the vibration isolator can also be judged based on the magnitude of the power flow.

[0057] Specifically, assuming that the power flow is P, the power acting on a point in the structure is calculated by the following formula: ,in, represents the external force acting at this point in the structure, Indicates force The speed response generated by this point under the action of , it can be seen that the power flow is a function of time t. From the perspective of vibration, the vibration point generally moves back and forth. For a very short vibration, it can be considered that the vibration is a simple harmonic vibration with a certain periodicity. Assuming the period is T, the vibration power flow within a vibration period can be obtained. The formula is: .

[0058] Since the vibration is a simple harmonic vibration, the simple harmonic excitation force can be expressed as: , where F represents the amplitude of the excitation force, represents the circular frequency of simple harmonic oscillation. The corresponding response speed can be expressed as: , where X represents the displacement amplitude, Represents the phase angle.

[0059] Then using complex numbers to represent simple harmonic oscillation, it can be expressed as:

[0060] ;

[0061] in, represents the imaginary unit, represents the displacement response, and They represent the simple harmonic excitation force The real and imaginary parts of and denote the real and imaginary parts of the displacement response, respectively, and Represent the real and imaginary parts of the speed response respectively. Thus, the time-averaged steady-state power flow can be obtained as:

[0062] ;

[0063] Where F represents the complex value obtained by Fourier transform of the excitation force, and V represents the complex value obtained by Fourier transform of the response speed. represents conjugation, It means taking the real part.

[0064] Therefore, for a three-dimensional solid finite element model, the power flow per unit area in each direction of the three-dimensional solid element can be expressed as: ,in, Represents normals Normal stress in direction, p n represents the power flow in the direction of the normal n, , and Normal direction, the conjugate of the complex velocity in the first direction and the second direction, and They represent the shear stress in the first direction and the second direction respectively. The first direction and the second direction are two orthogonal directions of the force-bearing surface of the three-dimensional solid unit.

[0065] For steady-state vibration, the following relationship exists: ,in, express The complex velocity in the direction, represents the excitation circular frequency, express Reset shift in direction.

[0066] The solid unit of the finite element model has three degrees of freedom in the x, y, and z directions. Therefore, the formula: Substituting into the formula: In the above equation, the power flow in three directions expressed by stress and displacement parameters can be obtained, that is, the power flow model is:

[0067] ;

[0068] Among them, p x represents the power flow in the x direction, p y represents the power flow in the y direction, p z represents the power flow in the z direction, Represents the normal as The upper edge of the axis Shear stress in the direction Represents the normal as The shear stress in the z direction on the plane of the axis, represents the shear stress along the x direction on the plane whose normal is the y axis, represents the shear stress along the z direction on the plane whose normal is the y axis, represents the shear stress along the x direction on the plane whose normal is the z axis, represents the shear stress along the y direction on the plane whose normal is the z axis, , , They represent the conjugate of the normal x, y, and z directions, respectively. , , Respectively represent the normal stress in the normal x, y, and z directions, Im() represents the imaginary part of the complex number, and ω represents the circular frequency of vibration. It can be seen from the above formula that if power flow analysis is to be performed, it is necessary to perform a harmonic response analysis on the structure, and then obtain the reset displacement of the response of each node at different frequencies and the stress value of each unit, and these parameters can be extracted through secondary development of the APDL language of ANSYS software. The specific extraction process belongs to the existing technology and will not be repeated here.

[0069] In addition, if Figure 2As shown, the bearing common cavity structure mainly includes a first elastic support 1, a second elastic support 2, a third elastic support 3, a first support seat 4, a second support seat 5, a folding structure 6, an inner casing 7, a support plate 8, an outer casing 9 and an outer casing mounting edge 10. During the operation of the engine, the vibration of the rotor is transmitted sequentially through three elastic supports, two support seats, a folding structure 6, an inner casing 7, a support plate 8, an outer casing 9 and an outer casing mounting edge 10. Among them, the connection and position relationship of each component in the bearing common cavity structure are not repeated here, which belongs to the prior art. First, a three-dimensional model of the bearing common cavity structure is constructed, and then the model is meshed using SOLID185 units using ANSYS commercial software. The unit size is set to 5 mm, the bearing seat material is casting K4163, and the material of other structures is casting K423A. The number of nodes after meshing is 389964, and the number of units is 275244. Then, a fixed constraint is applied to the left end of the outer casing 9, and the vertical freedom is restricted at the right end of the outer casing 9. Then, a mass21 unit is rigidly connected with the first elastic support 1 and the third elastic support 3. A force load can be applied to the mass21 unit to simulate the rotor vibration. Figure 3 As shown in the figure, mass21 unit is a mass unit built into ANSYS software, which is used to apply excitation force.

[0070] It can be understood that in step S2, in order to analyze the power flow of the bearing common cavity structure, the present invention applies vibration excitation in the finite element model based on the sensitive excitation frequency of the bearing common cavity structure, and calculates the power flow data of the finite element model under vibration excitation based on the power flow model, and then generates a power flow vector diagram based on the power flow data, and performs vibration energy transfer analysis on the power flow vector diagram to determine the optimized components. Among them, the sensitive excitation frequency is the excitation frequency corresponding to the rotor response amplitude point in the speed range of 0~45000rpm, and the natural frequency of the bearing casing, and the sensitive excitation frequency comes from the displacement response of each support near the natural frequency of the bearing structure.

[0071] For example, consider the first-order natural frequency of the bearing common cavity structure, which is 508Hz. Displacement excitations with amplitudes of 9.69E-13 and 8.702E-14 are applied to the first and third supports respectively. The displacement excitation value is derived from the calculation result of the rotor unbalance response. It simulates the vibration excitation applied by the rotor to the first and third supports when the rotor speed is 30480rpm. The specific calculation principle belongs to the prior art and will not be repeated here. Then, the power flow data p of each unit of the finite element model is calculated using the above-mentioned power flow model calculation formula. x 、p y 、p z , use Matlab to write a program to obtain the amplitude and direction of the vibration power flow through each unit, and the calculation is based on the following formula:

[0072] ;

[0073] ;

[0074] ;

[0075] ;

[0076] Among them, p x represents the power flow in the x direction, p y represents the power flow in the y direction, p z represents the power flow in the z direction, represents the total power flow amplitude flowing through a unit in the finite element model, , and Respectively represent the angles between the total power flow direction and the x-axis, y-axis and z-axis. Based on the power flow data of each unit, a power flow vector diagram can be generated, such as Figure 4 and Figure 5 shown.

[0077] For example, considering the second-order natural frequency of the bearing common cavity structure, the second-order natural frequency is 539Hz, and displacement excitations with amplitudes of 1.077E-12 and 3.053E-13 are applied to the first support and the third support respectively. The displacement excitation simulates the vibration excitation applied by the rotor to supports 4 and 6 when the rotor speed is 32340rpm. Then, the power flow model calculation formula mentioned above is used to calculate the power flow data p of each unit of the finite element model again. x 、p y 、p z , use Matlab to write a program to obtain the amplitude and direction of the vibration power flow through each unit, and generate a power flow vector diagram, such as Figure 6 and Figure 7 shown.

[0078] Through Figures 4 to 7 By analyzing the power flow vector diagram, it can be found that when the excitation source is located at the first support and the third support, no matter how the excitation frequency changes, the vibration energy is always transmitted to the reentry structure through the bearing seat, and then to the support plate and the outer casing. Therefore, the reentry structure is one of the key components that affect the vibration transmission and consumption of the common cavity structure; and there is a closed loop phenomenon in the vibration power flow in the local structure, such as the reentry structure and the outer casing. Figure 7 The circle in the figure shows that the power flow closed loop at the outer casing is as follows: Figure 8As shown, the closed loop of power flow means that the structure here bears the role of vibration energy consumption. Therefore, through the above analysis, it can be determined that the return structure and the outer casing structure play a vital role in the process of vibration energy transmission and consumption. If you want to reduce the external vibration of the bearing common cavity structure, you need to carry out structural optimization design of the return structure and the outer casing structure, so as to determine that the optimized components are the return structure and the outer casing structure.

[0079] It can be understood that in step S3, the folding structure and the outer casing structure have been determined as optimized components in step S2. In order to analyze the influence of the folding structure and the outer casing structure on the vibration energy transmission, it is studied how the vibration energy flows into and out of different components and the percentage of distribution under a specific excitation frequency, and the influence of the density and elastic modulus changes of the outer casing and the folding structure on the vibration energy distribution are analyzed respectively. Specifically, the folding structure is first analyzed, and the density is taken as 0.1, 0.4, 0.7, and 1.0 times of the original density, and the elastic modulus remains unchanged. Without changing the elastic modulus and only changing the material density of the folding structure, a power flow vector diagram is generated again, and it is found that the distribution trend of the vibration power flow is basically unchanged, that is, the material density of the folding structure has little effect on the overall vibration energy distribution mode of the bearing common cavity structure; then, without changing the density and changing the elastic modulus, a power flow vector diagram is generated, and it is found that the distribution trend of the vibration power flow has changed significantly, and the elastic modulus of the folding structure has a greater influence on the overall vibration energy distribution mode of the bearing common cavity structure. Similarly, the outer casing structure is also analyzed in the same way. Based on the above analysis process, it is found that the density of the return structure and the outer casing structure has little effect on the vibration energy distribution and vibration transmission path of the bearing common cavity structure, while changing the elastic modulus of the return structure and the outer casing structure will greatly affect the transmission path and distribution pattern of the vibration energy, indicating that the stiffness of the components has a great influence on the vibration of the bearing common cavity structure; and it is found that the power flow is mainly concentrated in the front and rear bearing seats, the return structure, the outer casing and the annular ring inside the outer casing mounting edge, and the outer casing and the annular ring will form a closed-loop area of ​​the vibration power flow to consume vibration energy. Extrusion oil film dampers are provided at the front and rear bearing seats. During actual operation, the vibration energy can be dissipated by the damper. Although the power flow closed loop formed by the outer casing and the annular ring inside it can consume vibration energy, no special damping elements are set for the two, so excessive vibration may occur. If the vibration here is to be reduced, it can be considered to achieve it by changing the structural form to destroy the form of the power flow closed loop. In addition, through comparative analysis, the present application found that if the elastic modulus of the fold-back structure in the existing design is reduced by 10%, it will lead to a significant change in the vibration energy transmission path. The vibration energy originally transmitted from the combustion rotor bearing seat to the fold-back structure is changed to be transmitted forward, which may cause the vibration of the rear support point of the combustion rotor to intensify. In summary, it can be determined that the optimization design direction of the optimized components includes increasing the elastic modulus of the fold-back structure and the outer casing and destroying the local power flow closed loop.

[0080] It can be understood that the optimized components and their optimized design directions have been determined in the above steps S2 and S3, and in the step S4, the genetic algorithm is used to carry out structural optimization design for the foldback structure and the outer casing structure respectively. Specifically, the process of determining the vibration reduction optimization design scheme of the optimized part based on the optimized design direction includes the following contents:

[0081] An opening structure is designed on the mounting edge of the outer casing, and a circle of elliptical holes is arranged circumferentially on the cylindrical surface of the outer casing. The number of elliptical holes and the ratio of the minor diameter to the major diameter are used as design variables, and the minimization of the total power flow amplitude transmitted to the mounting edge of the outer casing is used as the optimization objective function. A genetic algorithm is used for iterative solution to obtain the first set of vibration reduction optimization design solutions.

[0082] Specifically, an opening structure is designed on the mounting edge of the outer casing to destroy the closed loop of the vibration power flow, and a circle of elliptical holes is arranged circumferentially on the cylindrical surface of the outer casing. The number, minor diameter, and major diameter ratio of the elliptical holes are used as design variables, and the total power flow amplitude transmitted to the mounting edge of the outer casing is used as the optimization objective function, which can be expressed as: ,in, represents the power flow amplitude of the i-th unit on the outer casing installation side, n represents the total number of units on the outer casing installation side, , , and Respectively represent Units , and Then the genetic algorithm is used for iterative solution to obtain the first set of vibration reduction optimization design solutions, where the genetic algorithm belongs to the existing algorithm, and the specific iterative solution process will not be repeated here.

[0083] For example, in a certain embodiment, a hole is opened on the left cylindrical surface of the outer casing mounting edge, and a circle of elliptical holes is arranged circumferentially on the cylindrical surface of the outer casing. The maximum value of the minor diameter of the elliptical hole is 6.5 mm, the ratio of the major diameter to the minor diameter is in the range of 1 to 5, and the number of holes is 4 to 12. The number of elliptical holes, the minor diameter, and the ratio of the major diameter to the minor diameter are used as design variables, and the total power flow value of the outer casing is used as the optimization objective function. A genetic algorithm optimization program is written in MATLAB, and a population is established within a specified numerical range. The response value under 600 Hz excitation is calculated by the harmonic response analysis module, and then the reset displacement of the node and the stress of the unit are extracted by the APDL language, and the vibration power flow is calculated and output. The MATLAB optimization program reads, sorts, and optimizes, and the optimization design results obtained by iterative solution are: minor diameter: 6.5 mm, ratio of major diameter to minor diameter: 5, number of holes: 6, and the vibration reduction optimization design scheme is as follows: Fig. 9 shown.

[0084] In addition, the process of determining the vibration reduction optimization design scheme of the optimized part based on the optimization design direction includes the following contents:

[0085] Ribs were added to the foldable structure and the surface of the outer casing. The number and thickness of the ribs were used as design variables, and the minimization of the total power flow amplitude transmitted to the mounting edge of the outer casing was used as the optimization objective function. Genetic algorithm was used for iterative solution to obtain the second set of vibration reduction optimization design schemes.

[0086] Specifically, the stiffness of the fold-back structure and the outer casing structure is changed at the same time to reduce the response at the support and the vibration transmission of the outer casing. Ribs are added to the fold-back structure and the surface of the outer casing. The number and thickness of the ribs are used as design variables, and the minimization of the total power flow amplitude transmitted to the mounting edge of the outer casing is used as the optimization objective function, which can also be expressed as: . Genetic algorithm is then used for iterative solution to obtain a second set of vibration reduction optimization design solutions. In a certain embodiment of the present invention, reinforcing ribs are added to the folding structure, and axial reinforcing ribs are set on the surface of the outer casing. The second set of vibration reduction optimization design solutions obtained through iterative solution are as follows: 7 ribs are added to one side of each support plate, for a total of 70 ribs. Each rib has a width of 4.8 mm and a height of 1.2 mm, and the vibration reduction rate reaches 22.90%. In addition, after integrating the first set of vibration reduction optimization design solutions and the second set of vibration reduction optimization design solutions, the final vibration reduction optimization design solution is as follows: Fig.10 shown.

[0087] It can be understood that the vibration reduction design method of the bearing common cavity structure of the present invention can quickly determine the key components that affect the vibration energy transmission and consumption of the common cavity structure through finite element power flow analysis and drawing of power flow vector diagrams, and point out the direction for subsequent structural optimization design. Then, based on the key components of vibration energy transmission and consumption determined by the power flow vector diagram, the key variables of the optimization design are clarified, which greatly reduces the calculation amount, design cycle and design cost of the structural optimization design. In addition, for the first time, the vibration energy consumption of the components is reduced by destroying the closed-loop area of ​​the power flow through openings, which greatly reduces the vibration power flow transmitted from the rotor to the mounting edge of the outer casing, and reduces the external vibration. Moreover, it has been put into practical application. Based on the fact that the bearing common cavity structure was used for the first time in China on a certain type of turboshaft engine prototype, but the phenomenon of excessive vibration occurred many times during the whole machine test, subsequently, the key components of the bearing common cavity structure vibration energy transmission and consumption were quickly determined according to the present invention, and the bearing common cavity structure design scheme of a certain type of turboshaft engine was adjusted, which greatly reduced the vibration energy transmitted to the outer casing mounting edge. Using the adjusted structural design scheme, multiple and multi-level whole machine verification tests were carried out. The steady-state vibration amplitudes of each vibration measuring point of the adjusted engine within the full speed range were all below 12 mm / s, and the vibration characteristics were stable. The test results show that the improved bearing common cavity structure is reasonably designed and the rotor vibration characteristics are stable.

[0088] In addition, if Fig.11As shown, another embodiment of the present invention further provides a vibration reduction design system for a bearing common cavity structure, preferably using the vibration reduction design method as described above, including:

[0089] Model building module, used to build the finite element model of the power flow model and the bearing common cavity structure;

[0090] An optimized component determination module is used to apply vibration excitation in the finite element model based on the sensitive excitation frequency of the bearing common cavity structure, calculate the power flow data of the finite element model under vibration excitation based on the power flow model to generate a power flow vector diagram, and perform vibration energy transfer analysis on the power flow vector diagram to determine the optimized component;

[0091] An optimization direction determination module is used to analyze the factors affecting the power flow of the optimized component and determine the optimization design direction of the optimized component;

[0092] The vibration reduction optimization design module is used to determine the vibration reduction optimization design scheme of the optimized part based on the optimization design direction.

[0093] It can be understood that the vibration reduction design system of the bearing common cavity structure of this embodiment first constructs a power flow model and a finite element model of the bearing common cavity structure, then performs vibration excitation simulation and calculates the power flow data of the finite element model under vibration excitation based on the power flow model to generate a power flow vector diagram, and performs vibration energy transfer analysis on the power flow vector diagram to determine the optimized component. Then, the power flow influencing factors of the optimized component are analyzed to determine the optimized design direction of the optimized component. Finally, the vibration reduction optimization design scheme of the optimized part is determined according to the optimized design direction to reduce the external vibration. Since the vibration power flow describes the instantaneous energy in the process of structural vibration transmission, it can accurately reflect the vibration size, and the finite element power flow analysis and power flow vector diagram generation can accurately reflect the transmission path of the vibration, and can also quickly determine the key parts that affect the vibration energy transmission and consumption of the bearing common cavity structure, and then analyze the power flow influencing factors of the key components to determine the optimized design direction of the optimized components, which greatly reduces the calculation amount, design cycle and design cost of the structural optimization design, and greatly improves the vibration reduction effect.

[0094] In addition, another embodiment of the present invention further provides an electronic device, including a processor and a memory, wherein the memory stores a computer program, and the processor executes the steps of the above method by calling the computer program stored in the memory.

[0095] In addition, another embodiment of the present invention further provides a computer-readable storage medium for storing a computer program for performing vibration reduction design on a bearing common cavity structure, wherein the computer program executes the steps of the method described above when running on a computer.

[0096] Common computer-readable storage media include: floppy disks, flexible disks, hard disks, magnetic tapes, any other magnetic media, CD-ROMs, any other optical media, punch cards, paper tapes, any other physical media with patterns of holes, random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), flash-erasable programmable read-only memory (FLASH-EPROM), any other memory chip or cartridge, or any other medium that can be read by a computer. Instructions can further be transmitted or received by a transmission medium. The term transmission medium may include any tangible or intangible medium that can be used to store, encode or carry instructions for execution by a machine, and includes digital or analog communication signals or intangible media that facilitate communication of the above instructions. Transmission media include coaxial cables, copper wire, and optical fiber, including the wires of a bus used to transmit a computer data signal.

[0097] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The schemes in the embodiments of the present application may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0098] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0099] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0100] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0101] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0102] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

[0103] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vibration reduction design method for a bearing common cavity structure, characterized in that: Includes the following: Construct the finite element model of power flow model and bearing common cavity structure; Apply vibration excitation to the finite element model based on the sensitive excitation frequency of the bearing common cavity structure, calculate the power flow data of the finite element model under vibration excitation based on the power flow model to generate a power flow vector diagram, and perform vibration energy transfer analysis on the power flow vector diagram to determine the optimized components; Analyze the factors affecting the power flow of the optimized components and determine the optimization design direction of the optimized components. The optimized components include the outer casing and the return structure. The optimization design direction includes increasing the elastic modulus of the return structure and the outer casing and destroying the local power flow closed loop. Determine the vibration reduction optimization design scheme of the optimized part based on the optimization design direction; The process of determining the vibration reduction optimization design scheme of the optimized part based on the optimization design direction includes the following contents: An opening structure is designed on the mounting edge of the outer casing, and a circle of elliptical holes is arranged circumferentially on the cylindrical surface of the outer casing. The number of elliptical holes and the ratio of the minor diameter to the major diameter are used as design variables, and the minimization of the total power flow amplitude transmitted to the mounting edge of the outer casing is used as the optimization objective function. The genetic algorithm is used for iterative solution to obtain the first set of vibration reduction optimization design solutions. Ribs were added to the foldable structure and the surface of the outer casing. The number and thickness of the ribs were used as design variables, and the minimization of the total power flow amplitude transmitted to the mounting edge of the outer casing was used as the optimization objective function. Genetic algorithm was used for iterative solution to obtain the second set of vibration reduction optimization design schemes.

2. The vibration reduction design method for the bearing common cavity structure according to claim 1, characterized in that: The power flow model is: in, p x express x The power flow in the direction, p y express y The power flow in the direction, p z express z The power flow in the direction, Represents the normal as The upper edge of the axis Shear stress in the direction Represents the normal as The upper edge of the axis z Shear stress in the direction Represents the normal as y The upper edge of the axis Shear stress in the direction Represents the normal as y The upper edge of the axis z Shear stress in the direction Represents the normal as z The upper edge of the axis Shear stress in the direction Represents the normal as z The upper edge of the axis y Shear stress in the direction , , Respectively represent normal x , y , z The conjugate of the reset shift in the direction, , , Respectively represent normal x , y , z Direction normal stress, Im() represents the imaginary part of the complex number, ω Indicates the circular frequency of vibration.

3. The vibration reduction design method for a bearing common cavity structure according to claim 1, characterized in that: The power flow data includes the power flow magnitude and power flow direction, which are calculated based on the following formula: ； ； ； ； in, p x express x The power flow in the direction, p y express y The power flow in the direction, p z express z The power flow in the direction, represents the total power flow amplitude flowing through a unit in the finite element model, , and They represent the total power flow direction and x axis, y Axis and z The angle of the axis.

4. A vibration reduction design system for a bearing common cavity structure, using the vibration reduction design method for a bearing common cavity structure as claimed in any one of claims 1 to 3, characterized in that: include: Model building module, used to build the finite element model of the power flow model and the bearing common cavity structure; An optimized component determination module is used to apply vibration excitation in the finite element model based on the sensitive excitation frequency of the bearing common cavity structure, calculate the power flow data of the finite element model under vibration excitation based on the power flow model to generate a power flow vector diagram, and perform vibration energy transfer analysis on the power flow vector diagram to determine the optimized component; An optimization direction determination module is used to analyze the factors affecting the power flow of the optimized component and determine the optimization design direction of the optimized component; The vibration reduction optimization design module is used to determine the vibration reduction optimization design scheme of the optimized part based on the optimization design direction.

5. An electronic device, characterized in that: The method comprises a processor and a memory, wherein a computer program is stored in the memory, and the processor is used to execute the steps of the method according to any one of claims 1 to 3 by calling the computer program stored in the memory.

6. A computer-readable storage medium for storing a computer program for vibration reduction design of a bearing common cavity structure, characterized in that: When the computer program is run on a computer, the steps of the method according to any one of claims 1 to 3 are executed.

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