CN116702536A - Method and device for simulating structural strength and durability of air cylinder for air suspension - Google Patents
Method and device for simulating structural strength and durability of air cylinder for air suspension Download PDFInfo
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Abstract
The invention belongs to the technical field of automobiles, and particularly relates to a method and a device for simulating structural strength and durability of an air cylinder for an air suspension. Comprising the following steps: 1. determining the strength and durability simulation boundary condition of the air reservoir; 2. structural design is carried out on the cylinder body of the air cylinder based on a section topology optimization method; 3. structural design is carried out on the end cover of the air cylinder based on morphology optimization; 4. drawing a three-dimensional geometric model of the air reservoir by combining process conditions and material density distribution characteristics; 5. importing the geometric model of the air reservoir into finite element analysis software, and establishing a grid model for simulation verification of strength durability; if the strength durability meets the evaluation index, finishing calculation; and if the strength durability does not meet the evaluation index, carrying out local optimization until the structure of the air reservoir meets the strength durability requirement. The invention has the advantages of high speed, high efficiency, shortened product development period, and corresponding evaluation index, and fills the blank in the field of strength and durability simulation analysis of the air cylinder for the air suspension of the passenger car.
Description
Technical Field
The invention belongs to the technical field of automobiles, and particularly relates to a method and a device for simulating structural strength and durability of an air cylinder for an air suspension.
Background
The existing aluminum alloy air cylinder for the passenger car air suspension is generally simple in structure and is formed by welding a cylinder body and two end covers, the cylinder body is of a simple cylindrical structure, in order to avoid the problem of weld quality caused by the traditional coil welding process, an aluminum alloy extrusion forming process is adopted at present, and the end covers are formed by a stamping forming process. The air cylinder works for a long time under the condition of continuous inflation and deflation and bears the alternating action of high and low pressure inside, so that the air cylinder has good strength and durability when in structural design. The following problems are unavoidable when designing the structure: 1. due to the limited space and the limited internal volume of the air cylinder, in some vehicle models, the air cylinder body cannot be designed into an ideal cylindrical structure, as shown in fig. 1 (including but not limited to fig. 1, 2 and 3). Under the condition, the action effect of the pressure in the cylinder body in all directions is unbalanced, the stress is easy to concentrate, even the stress exceeds the strength limit of the material, and further the structure at the position generates larger plastic deformation and causes risks such as explosion. 2. Because of the limitation of the cylinder structure and the external arrangement space, the shape of the end cover cannot be designed into a regular sphere-like shape, and in addition, the existence of the air inlet boss and the air outlet boss, how to reduce the stress of the end cover is often a difficulty in the structural design of the air storage cylinder with a special shape.
At present, few researches are still carried out on an air reservoir simulation analysis algorithm, and particularly few researches are carried out on an air reservoir structure optimization and strength durability simulation method for an air suspension of a passenger car. The development of the air cylinder structure with a special shape is completely based on experience of a designer, so that a longer design period is required, and the strength and durability of the air cylinder structure cannot be ensured.
Disclosure of Invention
The invention provides a method and a device for simulating the structural strength and durability of an air reservoir for an air suspension, which are quick and efficient, shorten the development period of products, provide corresponding evaluation indexes and fill the blank in the field of simulation analysis of the strength and durability of the air reservoir for the air suspension of a passenger car.
The technical scheme of the invention is as follows in combination with the accompanying drawings:
in a first aspect, an embodiment of the present invention provides a method for simulating structural strength and durability of an air cylinder for an air suspension, including the following steps:
step one, determining boundary conditions of strength and durability simulation of the air cylinder;
step two, structural design is carried out on the cylinder body of the air cylinder based on a cross section topology optimization method;
thirdly, structural design is carried out on the end cover of the air cylinder based on a morphology optimization means;
drawing a three-dimensional geometric model of the air reservoir by combining process conditions and material density distribution characteristics;
Step five, importing the geometric model of the air reservoir in the step four into finite element analysis software, and establishing a grid model for simulation verification of strength durability; if the strength durability meets the evaluation index, the calculation is finished; if the strength durability performance does not meet the evaluation index, carrying out local optimization or returning to the second step and the third step, and readjusting the optimization constraint condition until the air reservoir structure meets the strength durability performance requirement.
Further, the specific method of the first step is as follows:
determining minimum working pressure Q of air reservoir in normal operation min Maximum working pressure Q max And the minimum pressure Q when blasting occurs is three working conditions, and is defined as a severe working condition, and the severe working condition is defined as a boundary condition for the strength and durability simulation of the air cylinder.
Further, the specific method of the second step is as follows:
21 Determining the maximum design space of the air reservoir according to the arrangement relation of the air reservoir peripheral suspension and other assemblies to obtain a closed contour line C along the circumferential direction of the cylinder 0 ；
22 Circumferential contour line C of cylinder body of air storage cylinder 0 Introducing finite element analysis software, creating a first barrel section 1 by taking the closed contour line as a boundary, and carrying out finite element grid division on the first barrel section 1 by adopting a two-dimensional quadrilateral shell unit;
23 Along a circumferential contour line C) 0 Two rows of quadrilateral units are created along the normal direction and the opposite direction of the unit of the first cylinder section 1 respectively, the unit size is 2mm, and the newly created grid units form a second cylinder section 2, so that the normal direction of the second cylinder section 2 is ensured to be from inside to outside; the first cylinder section 1 and the second cylinder section 2 form a circumferential contour line C 0 A two-dimensional grid cell having a T-shaped cross-sectional profile feature;
24 Respectively placing the materials and the properties of the middle grid units of the first cylinder section 1 and the second cylinder section 2 into different groups, keeping the corresponding parameters consistent with the cylinders, and giving corresponding units;
25 Establishing topological optimization boundary conditions of the cylinder body of the air storage cylinder, and performing optimization calculation on the section of the cylinder body with the T-shaped section profile characteristics;
26 A cross-section topological optimization model is established.
Further, the specific method of the step 25) is as follows:
251 Defining the working condition of topology optimization assessment; adding uniformly distributed pressure load on grid cells of a corresponding group of the second cylinder section 2, wherein the load direction is equal to that of a single cylinderThe element normal direction is consistent, the size is consistent with the minimum working pressure load Q of the air storage cylinder min Consistent;
252 Defining initial constraint conditions of the model; using inertial release as a model initial constraint;
253 Defining a design variable; defining grid cells of a corresponding group of the first barrel section 1 as a design area with optimized section topology, wherein each shell cell in the area is the minimum cell with variable density, and restraining the minimum dimension mindim value of the design area; defining the units of the corresponding group of the second cylinder section 2 as non-design areas;
254 Defining a response; including design region volume fraction response Volumefrac, overall compliance response complexation;
255 Defining constraint conditions; constraining the design variable by taking the volume fraction Volumafrac as a constraint condition;
256 Defining an objective function, submitting a topological optimization calculation model, defining the minimum overall flexibility as a target, and calculating to obtain a unit density distribution cloud picture on the first barrel section 1.
Further, the specific method of the third step is as follows:
31 When a morphology optimization model is established for the cylinder body of the air cylinder by a section topology optimization method, extracting the middle surface of the end cover model, and carrying out two-dimensional shell cell grid division;
32 Defining a connecting ring surface of the end cover and the cylinder body as an undesigned area, and defining the rest curved surface part units as a signed area;
33 Defining the width, angle and height of the reinforcing ribs in the design area, or adding the distribution characteristics of the reinforcing ribs according to the structural characteristics of the end cover; selecting and defining other optimization parameters according to model characteristics, and finally submitting morphology optimization analysis;
34 And (3) establishing a morphology optimization model according to the morphology optimization analysis result.
Further, the specific method of the fourth step is as follows:
and (3) deriving the optimization calculation results obtained in the second step and the third step in an STP format, and drawing a three-dimensional geometric model of the air reservoir by combining process conditions, material density distribution characteristics and internal volume requirements.
Further, the specific method of the fifth step is as follows:
51 Establishing a finite element grid model based on the three-dimensional geometric model of the air reservoir obtained in the step four; dividing by adopting a second order tetrahedron C3DM10 entity unit;
52 Establishing a connection relationship between the components of the air reservoir; binding contact relation is established between the bracket and the cylinder body, and between the end cover and the cylinder body; the fixed point is connected with the ring surface node in the bolt hole of the bracket through a motion coupling constraint relationship;
53 Defining the materials of all parts of the air reservoir assembly; the method comprises the steps of carrying out assignment according to actual material attribute parameters, respectively defining material elastic modulus, poisson ratio and density value, and fitting a plastic constitutive equation of the material;
54 Calculating the load corresponding to different working conditions and submitting the load to calculation so as to judge the structural strength and durability of the air cylinder for the air suspension.
In a second aspect, an embodiment of the present invention further provides a device for simulating structural strength and durability of an air cylinder for an air suspension, which is characterized by comprising:
The determining module is used for determining boundary conditions of the strength durability simulation of the air cylinder;
the first design module is used for carrying out structural design on the cylinder body of the air cylinder based on a section topology optimization method;
the second design module is used for carrying out structural design on the air cylinder end cover based on a morphology optimization means;
the model building module is used for drawing a three-dimensional geometric model of the air reservoir by combining process conditions and material density distribution characteristics;
the simulation module is used for importing the geometrical model of the air reservoir into finite element analysis software, and establishing a grid model for strength durability simulation verification; if the strength durability meets the evaluation index, the calculation is finished; if the strength durability performance does not meet the evaluation index, carrying out local optimization or returning to the first design module or the second design module, and readjusting the optimization constraint condition until the air reservoir structure meets the strength durability performance requirement.
In a third aspect, a terminal is provided, including:
one or more processors;
a memory for storing the one or more processor-executable instructions;
wherein the one or more processors are configured to:
the method according to the first aspect of the embodiment of the invention is performed.
In a fourth aspect, a non-transitory computer readable storage medium is provided, which when executed by a processor of a terminal, enables the terminal to perform the method according to the first aspect of the embodiments of the invention.
In a fifth aspect, an application product is provided, which when running at a terminal causes the terminal to perform the method according to the first aspect of the embodiments of the invention.
The beneficial effects of the invention are as follows:
1) The invention has the advantages of high speed, high efficiency and shortened product development period;
2) The invention provides corresponding evaluation indexes, and fills the blank in the field of strength and durability simulation analysis of the air cylinder for the air suspension of the passenger car.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a conventional cylinder type automotive air reservoir;
FIG. 2 is a schematic view of a special shape automotive air reservoir;
FIG. 3 is a schematic view of another specific shape automotive air reservoir;
FIG. 4 is a flow chart of a method for simulating structural strength and durability of an air cylinder for an air suspension according to the present invention;
FIG. 5 is a schematic illustration of the axial and axial definitions of the air reservoir;
FIG. 6 is a schematic diagram of pressure loading during a durable condition;
FIG. 7 is a schematic diagram of a finite element model of a complete cross section of a cylinder;
FIG. 8 is a schematic diagram of a full section load distribution;
FIG. 9 is a schematic diagram showing the distribution of the reinforcing ribs on the cross section of the first cylinder after topology optimization;
FIG. 10 is a schematic diagram of another cylinder full section finite element model;
FIG. 11 is another schematic illustration of a full section load distribution;
FIG. 12 is a schematic view of another topology optimized first cylinder section with ribs distributed thereon;
FIG. 13 is a schematic diagram of a gas reservoir geometry model;
FIG. 14 is a schematic diagram of the connection of the components;
FIG. 15 is a cloud chart of stress distribution of a working condition a air cylinder;
FIG. 16 is a schematic view of a device for simulating structural strength and durability of an air cylinder for an air suspension according to the present invention;
fig. 17 is a schematic block diagram of a terminal structure.
In the figure:
1. a first barrel section; 2. a second barrel section.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
Example 1
Fig. 4 is a flowchart of a method for simulating structural strength and durability of an air receiver for an air suspension according to an embodiment of the present invention, where the method may be implemented by an apparatus for simulating structural strength and durability of an air receiver for an air suspension according to an embodiment of the present invention, and the apparatus may be implemented in software and/or hardware.
A method for simulating structural strength and durability of an air cylinder for an air suspension comprises the following steps:
step one, determining boundary conditions of strength and durability simulation of the air cylinder; the method comprises the following steps:
because the air reservoir works for a long time under the condition of continuous inflation and deflation and bears the alternating action of high and low internal pressure, the air reservoir is more focused on the minimum working pressure Q of the air reservoir during normal operation min Maximum working pressure Q max And the minimum pressure Q when blasting occurs, the bearing amplitude of the air cylinder during working is determined by the three internal pressures, and the three working conditions are determined to be the bad working conditions of the air cylinder covered by the invention according to the air cylinder supply conditions and the relevant regulations of the test standard for the automobile formulated in the enterprise and the actual working conditions of the vehicle.
Step two, structural design is carried out on the cylinder body of the air cylinder based on a cross section topology optimization method; establishing a topological optimization grid model of the cylinder body of the air storage cylinder; according to the structural characteristics and stress conditions of the extrusion molding cylinder, the invention adopts the simple two-dimensional shell unit stress problem with T-shaped section profile characteristics to perform topology optimization, which is equivalent to the three-dimensional air cylinder stress problem. The section has the following obvious characteristics: 1) Consists of two mutually perpendicular surfaces; 2) The cell normal on these two faces has specific requirements, specifically as follows:
21 According to the cylinder peripheral suspensionThe arrangement relation of the assemblies determines the maximum design space of the air cylinder to obtain a closed contour line C along the circumferential direction of the cylinder 0 The method comprises the steps of carrying out a first treatment on the surface of the A schematic diagram of the circumferential and axial definition of the air reservoir is shown in fig. 5.
22 Circumferential contour line C of cylinder body of air storage cylinder 0 And (3) introducing finite element analysis software, creating a first barrel section 1 by taking the closed contour line as a boundary, and carrying out finite element grid division on the first barrel section 1 by adopting a two-dimensional quadrilateral shell unit.
23 Along a circumferential contour line C) 0 Two rows of quadrilateral units are created along the normal direction and the opposite direction of the unit of the first cylinder section 1 respectively, the unit size is 2mm, and the newly created grid units form a second cylinder section 2, so that the normal direction of the second cylinder section 2 is ensured to be from inside to outside; the first cylinder section 1 and the second cylinder section 2 form a circumferential contour line C 0 Two-dimensional grid cells with T-shaped cross-sectional profile features.
24 Respectively placing the materials and the properties of the middle grid units of the first cylinder section 1 and the second cylinder section 2 into different groups, keeping the corresponding parameters consistent with the cylinders, and giving corresponding units; in the structural design part of the air cylinder, only the elastic properties of the material line are considered.
25 Establishing topological optimization boundary conditions of the cylinder body of the air cylinder, and performing optimization calculation on the section of the cylinder body with the T-shaped section profile characteristics.
251 Defining the working condition of topology optimization assessment; uniformly distributing pressure load on grid cells of a corresponding group of the second cylinder section 2, wherein the load direction is consistent with the cell normal direction, and the load is equal to the minimum working pressure load Q of the air reservoir min And consistent.
252 Defining initial constraint conditions of the model; inertial release was used as a model initial constraint.
253 Defining a design variable; defining grid cells of a corresponding group of the first barrel section 1 as a design area with optimized section topology, wherein each shell cell in the area is the minimum cell with variable density, and restraining the minimum dimension mindim value of the design area; the corresponding set of cells of the second cylinder section 2 is defined as the non-design area.
254 Defining a response; including the design area volume fraction response Volumefrac and the overall compliance response completions.
255 Defining constraint conditions; the design variables are constrained by using the volume fraction Volumafrac as a constraint condition.
256 Defining an objective function, submitting a topological optimization calculation model, defining the minimum overall flexibility as a target, and calculating to obtain a unit density distribution cloud picture on the first barrel section 1.
26 A cross-section topological optimization model is established.
Thirdly, structural design is carried out on the end cover of the air cylinder based on a morphology optimization means;
31 When a morphology optimization model is established for the cylinder body of the air cylinder by a section topology optimization method, the middle surface of the end cover model is extracted, and two-dimensional shell cell grid division is performed.
32 The connecting ring surface of the end cover and the cylinder body is defined as an undesigned area, and the rest curved surface part units are defined as a signed area.
33 Defining the width, angle and height of the rib in the design area, or adding the distribution characteristics of the reinforcing ribs according to the structural characteristics of the end cover, such as symmetry and the like; and the other optimization parameters such as a response function, constraint conditions, an optimization target and the like are selected and defined according to model characteristics and design experience, and finally morphology optimization analysis is submitted.
34 And (3) establishing a morphology optimization model according to the morphology optimization analysis result.
Drawing a three-dimensional geometric model of the air reservoir by combining process conditions and material density distribution characteristics;
and (3) deriving the optimization calculation results obtained in the second step and the third step in an STP format, and drawing a three-dimensional geometric model of the air reservoir by combining process conditions, material density distribution characteristics and internal volume requirements. Thus, the initial design of the air reservoir structure is completed.
Step five, importing the geometric model of the air reservoir in the step four into finite element analysis software, and establishing a grid model for simulation verification of strength durability; if the strength durability meets the evaluation index, the calculation is finished; if the strength durability performance does not meet the evaluation index, carrying out local optimization or returning to the second step and the third step, and readjusting the optimization constraint condition until the air reservoir structure meets the strength durability performance requirement.
51 Establishing a finite element grid model based on the three-dimensional geometric model of the air reservoir obtained in the step four; the air cylinder is fixed on the vehicle body through the bracket, and has a certain constraint effect on the deformation of the air cylinder, so that the influence of the air cylinder fixing bracket is needed to be considered when the strength and durability analysis is carried out. Because the joint of the reinforcing rib and the cylinder body is generally provided with a chamfer, the characteristic of the fillet of the transition area is disappeared when the middle surface is extracted, and therefore, when the simulation modeling of the strength durability performance is carried out, the grid division cannot be carried out by adopting a shell unit, but the division should be carried out by adopting a second-order tetrahedron C3DM10 entity unit.
52 Establishing a connection relationship between the components of the air reservoir; binding contact relation is established between the bracket and the cylinder body, and between the end cover and the cylinder body; the fixed point is connected with the ring surface node in the bolt hole of the bracket through a motion coupling constraint relation.
53 Defining the materials of all parts of the air reservoir assembly; and (3) assigning values according to actual material attribute parameters, and respectively defining material elastic modulus, poisson ratio and density values. Because the influence of the plastic property of the material is considered in part of working conditions, a real stress-strain curve of the material can be obtained through a tensile test, or a plastic constitutive equation of the material can be fitted according to the type of the material, the strength of the material and the Swift-Hohenberg formula.
54 Calculating the load corresponding to different working conditions and submitting the load to calculation so as to judge the structural strength and durability of the air cylinder for the air suspension. The strength and durability simulation method of the air cylinder provided by the invention needs to examine the following working conditions:
working condition a, namely the maximum working pressure working condition, and constraining the freedom degree of the bracket fixed point 1-6 direction by the established finite element model of the air reservoir according to actual conditions without considering material plasticity, and adding pressure excitation loads perpendicular to the surfaces along the unit normal direction on the inner surfaces of the end cover and the cylinder respectively, wherein the load is Q max And then carrying out finite element analysis and calculation to obtain a stress cloud picture under the working condition. Comparing the analysis result with the strength limit of the material, and if the stress value is smaller than the strength limit, carrying out the next working condition b; if the stress value is largeAt the intensity limit, local structural optimization is carried out or the second step and the third step are returned according to the conditions until the requirement is met.
Working condition b, namely the working condition of maximum working pressure, taking material plasticity into consideration, constraining the freedom degree of a bracket fixed point in the direction of 1-6 by the established finite element model of the air reservoir according to actual conditions, and adding pressure excitation loads perpendicular to the surfaces of the end cover and the inner surface of the cylinder body along the unit normal direction respectively, wherein the load is Q max And then carrying out finite element analysis and calculation to obtain a plastic strain distribution cloud picture of the unloaded material. If the plastic strain value is lower than 0.5%, carrying out the next working condition c; if the plastic strain value is greater than 0.5%, local structural optimization is optionally performed or the second and third steps are returned until the plastic strain value is satisfied.
And c, namely a minimum bursting pressure working condition, taking material plasticity into consideration, restricting the degree of freedom of the fixed point 1-6 directions of the bracket by the established finite element model of the air storage cylinder according to practical conditions, adding pressure excitation load vertical to the surface on the inner surfaces of the end cover and the cylinder body along the normal direction of the unit respectively, wherein the load is Q, then carrying out finite element analysis and calculation to obtain a plastic deformation distribution cloud picture of the air storage cylinder after unloading, and adopting a formula (1) to respectively calculate the ratio of permanent deformation of the air storage cylinder along the circumferential and axial dimensions. Wherein C is 0 The circumferential original size of the air cylinder is obtained after unloading under the working condition C; l (L) 0 The axial original dimension of the air cylinder is L, and the unloading is the axial dimension of the air cylinder after unloading under the working condition c. If the permanent deformation of the circumferential dimension is less than or equal to 1 percent and the permanent deformation of the axial dimension is less than or equal to 1.5 percent, the next working condition d is carried out; if any one is not satisfied, local structural optimization is optionally performed or the second step and the third step are returned until the satisfaction is achieved.
The working condition d, namely the durable working condition, does not consider the plasticity of materials, and the specific constraint and loading mode are the same as the above, the durable working condition of the air reservoir defined by the invention is a constant-amplitude durable working condition, the stress distribution of the air reservoir assembly under the working condition of minimum working pressure and the working condition of maximum working pressure is calculated respectively, and the stress distribution results obtained by the calculation of the two working conditions are imported into FEMFAT software for durable analysis. The curve shown in fig. 6 is circularly loaded for 20 ten thousand times, the damage value is recommended to be used as a durability analysis target, and if the damage value is less than 1, the calculation is completed; if the damage value is more than or equal to 1, local structure optimization is carried out or the second step and the third step are returned according to the situation until the damage value is met.
Example two
In this example, the air reservoir is of an L-shaped configuration, i.e. of the type shown in fig. 2, determined by the spatial arrangement. Taking the structural design of the L-shaped air cylinder body as an example, the cross section topology optimization process and the effect are described in detail:
step one, determining the strength and durability simulation analysis boundary conditions of the air cylinder. Minimum operating pressure Q at normal operation in this example min =4bar, maximum working pressure Q max =19 bar, the minimum pressure q=40 bar at which bursting occurs.
And step two, establishing a topological optimization grid model of the cylinder body of the air cylinder. According to the structural characteristics and stress conditions of the extrusion molding cylinder, the invention adopts the simple two-dimensional shell unit stress problem with T-shaped section profile characteristics to perform topology optimization, which is equivalent to the three-dimensional air cylinder stress problem. The section has the following obvious characteristics: 1) Consists of two mutually perpendicular surfaces; 2) The cell normal on both faces has specific requirements. The section creation process includes the steps of:
21 Determining the maximum design space of the air reservoir according to the arrangement relation of the air reservoir peripheral suspension and other assemblies to obtain a closed contour line C along the circumferential direction of the cylinder 0 。
22 Circumferential contour line C) of the cylinder 0 Finite element analysis software is imported, the closed contour line is used as a boundary to create a first barrel section 1, and a two-dimensional quadrilateral shell unit is used for carrying out finite element grid division on the first barrel section.
23 Along a circumferential contour line C) 0 Two rows of quadrilateral units are respectively built along the normal direction and the reverse direction of the unit of the first barrel section 1, the unit size is 2mm, the newly built grid units form a second barrel section 2, and the first barrel section 1 and the second barrel sectionThe face 2 constitutes a circumferential contour line C 0 Two-dimensional grid cells with T-shaped cross-sectional profile features. The final complete cross section is shown in fig. 7, ensuring that the second barrel cross section 2 normal is consistent with the unit normal shown in fig. 7.
24 The materials and properties of the grid cells in the first cylinder section 1 and the second cylinder section 2 are placed in different groups, respectively, the corresponding parameters remain consistent with the cylinder and are assigned to the corresponding cells.
And thirdly, establishing a barrel topology optimization boundary condition, and performing optimization calculation on a barrel section with a T-shaped section profile characteristic. The method specifically comprises the following steps:
31 Defining the working condition of topology optimization assessment. And uniformly distributing pressure load on grid cells of a corresponding group of the second cylinder section 2, wherein the load direction is consistent with the normal direction of the cells, and the load is 4bar with the minimum working pressure load of the air storage cylinder. A full section load distribution schematic is shown in fig. 8.
32 Defining model initial constraints. Inertial release was used as a model initial constraint.
3.3 define design variables. Defining a grid unit of a corresponding group of the first barrel section 1 as a design area with optimized section topology, wherein each shell unit in the area is a minimum unit with variable density, and restraining the minimum dimension mindim=15mm of the design area; the corresponding set of cells of the second cylinder section 2 is defined as the non-design area.
34 Defining a response including a design region volume fraction response Volumefrac, an overall compliance response completions.
35 Defining constraints. And constraining the design variable by taking the volume fraction Volumefrac less than or equal to 10% as a constraint condition.
36 Defining the minimum of the overall compliance as a target and submitting topology optimization calculation, and obtaining the distribution mode of the reinforcing ribs on the first barrel section 1 after calculation, wherein the distribution mode is shown in figure 9.
Example III
In this example, the air reservoir is of the type shown in fig. 3, determined by the spatial arrangement. Taking the structural design of the cylinder body of the air cylinder as an example, the cross section topology optimization process and the effect are described in detail:
Step one, determining the strength and durability simulation analysis boundary conditions of the air cylinder. Minimum operating pressure Q at normal operation in this example min =4bar, maximum working pressure Q max =19 bar, the minimum pressure q=40 bar at which bursting occurs.
And step two, establishing a topological optimization grid model of the cylinder body of the air cylinder. According to the structural characteristics and stress conditions of the extrusion molding cylinder, the invention adopts the simple two-dimensional shell unit stress problem with T-shaped section profile characteristics to perform topology optimization, which is equivalent to the three-dimensional air cylinder stress problem. The section creation process includes the steps of:
21 Determining the maximum design space of the air reservoir according to the arrangement relation of the air reservoir peripheral suspension and other assemblies to obtain a closed contour line C along the circumferential direction of the cylinder 0 。
22 Circumferential contour line C) of the cylinder 0 And (3) introducing finite element analysis software, creating a first barrel section 1 by taking the closed contour line as a boundary, and carrying out finite element grid division on the first barrel section 1 by adopting a two-dimensional quadrilateral shell unit.
23 Along a circumferential contour line C) 0 Two rows of quadrilateral units are respectively built along the normal direction and the reverse direction of the unit of the first barrel section 1, the unit size is 2mm, the newly built grid units form a second barrel section 2, and the first barrel section 1 and the second barrel section 2 form a circumferential contour line C 0 Two-dimensional grid cells with T-shaped cross-sectional profile features. The final complete cross section is shown in fig. 10, ensuring that the second barrel cross section 2 normal is consistent with the unit normal shown in fig. 10.
24 The materials and properties of the grid cells in the first cylinder section 1 and the second cylinder section 2 are placed in different groups, respectively, the corresponding parameters remain consistent with the cylinder and are assigned to the corresponding cells.
And thirdly, establishing a barrel topology optimization boundary condition, and performing optimization calculation on a barrel section with a T-shaped section profile characteristic. The method specifically comprises the following steps:
31 Defining the working condition of topology optimization assessment. And uniformly distributing pressure load on grid cells of a corresponding group of the second cylinder section 2, wherein the load direction is consistent with the normal direction of the cells, and the load is 4bar with the minimum working pressure load of the air storage cylinder. A full section load distribution diagram is shown in fig. 11.
32 Defining model initial constraints. Inertial release was used as a model initial constraint.
33 Defining a design variable, namely defining grid cells of a corresponding group of the first barrel section 1 as a design area with optimized section topology, wherein each shell cell in the area is a minimum cell with variable density, and restraining the minimum dimension mindim=15 mm of the design area; the corresponding set of cells of the second cylinder section 2 is defined as the non-design area.
34 Defining a response including a design region volume fraction response Volumefrac, an overall compliance response completions.
35 Defining constraint conditions, and constraining the design variables by taking the volume fraction Volumefrac less than or equal to 10% as the constraint conditions.
36 Defining the minimum of the overall compliance as a target and submitting topology optimization calculation, and obtaining the distribution mode of the reinforcing ribs on the first barrel section 1 after calculation, wherein the distribution mode is shown in figure 12.
Example IV
In this example, the strength durability simulation process is described in detail by taking the L-type air cylinder as an example in the above case.
Firstly, the obtained optimization calculation result is exported in STP format, and the three-dimensional geometric model of the air reservoir is drawn by combining the process conditions, the material density distribution characteristics and the internal volume requirements. As shown in fig. 13. And then establishing a finite element model of the air reservoir, and performing strength durability simulation analysis. And importing the obtained air reservoir geometric model into finite element analysis software, and establishing a grid model for strength durability simulation verification. If the strength durability meets the evaluation index, the calculation is finished; if the strength durability does not meet the evaluation index, carrying out local optimization or returning to the second step and the third step, and readjusting the optimization constraint condition until the structure of the air reservoir meets the strength durability requirement. When the strength and durability of the air cylinder are simulated, the key points are as follows:
1) And establishing a finite element grid model based on the geometric model obtained by the early structural design. Because the joint of the reinforcing rib and the cylinder body is generally provided with a chamfer, the characteristic of the fillet of the transition area is disappeared when the middle surface is extracted, and therefore, when the simulation modeling of the strength durability performance is carried out, the grid division cannot be carried out by adopting a shell unit, but the division should be carried out by adopting a second-order tetrahedron C3DM10 entity unit.
2) And establishing the connection relation among the components of the air reservoir. Binding contact relation is established between the bracket and the cylinder body, and between the air storage cylinder end cover and the cylinder body; the anchor points are connected with the nodes of the annulus in the bolt holes of the bracket by a kinematic coupling constraint relationship, as shown in figure 14.
3) Defining the materials of each component of the air reservoir assembly. End cover and support materials are defined as 5083Al, cylinder materials are 6061Al, elastic modulus of the materials is 74000MPa, poisson's ratio is 0.33, and density is 2.7g/cm 3 . The related properties of the two materials are respectively as follows: 5083Al, sigma s ＝125Mpa，σ b ＝275Mpa，δ＝13％；6061Al，σ s ＝240Mpa，σ b =290 Mpa, δ=10%. And respectively fitting plastic stress strain curves of the two materials according to the material type, the material strength and the Swift-Hohenberg formula, and writing the plastic stress strain curves into corresponding working condition material files.
4) Defining boundary conditions of the strength and durability simulation analysis of the air reservoir, and submitting the load corresponding to each working condition to calculation. The method for simulating the strength and durability of the air cylinder provided by the invention needs to examine four working conditions a, b, c and d, and the working condition a is taken as an example for a detailed description, and other working condition results are briefly described.
The working condition a, namely the working condition of maximum working pressure, is free from considering the plasticity of materials, the established finite element model of the air reservoir is restricted to the degrees of freedom in the directions of the fixed points 1 to 6 of the three brackets, pressure excitation loads perpendicular to the surface are respectively added to the inner surfaces of the end cover and the cylinder body along the normal direction of the unit, the load is 19bar, and then finite element analysis and calculation are submitted to obtain a stress cloud diagram under the working condition, as shown in figure 15. The maximum stress value of the end cover of the air storage cylinder under the working condition a in the case is 176Mpa, the maximum stress value of the cylinder body is 232Mpa, the maximum stress value of the air storage cylinder is lower than the strength limit value of the corresponding material, the working condition a meets the requirement, and the analysis of the next working condition b is continued.
And c, under the working condition b, namely the working condition of maximum working pressure, taking the plasticity of materials into consideration, restricting the freedom degree of the fixed point of the bracket in the direction of 1-6 by the established finite element model of the air storage cylinder according to practical conditions, respectively adding pressure excitation load vertical to the surface of the air storage cylinder along the normal direction of the unit on the inner surfaces of the end cover and the cylinder body, wherein the load is 19bar, then submitting finite element analysis and calculation to obtain a plastic strain distribution cloud picture of the unloaded materials, wherein the maximum plastic strain is 0.112%, the requirement is met, and carrying out the next working condition c.
And c, namely a minimum bursting pressure working condition, taking the plasticity of the material into consideration, restricting the freedom degree of the fixed point of the bracket in the direction of 1-6 by the established finite element model of the air cylinder according to actual conditions, respectively adding pressure excitation load vertical to the surface of the end cover and the inner surface of the cylinder along the normal direction of the unit, wherein the load is 40bar, and then carrying out finite element analysis and calculation to obtain a plastic deformation distribution cloud picture of the unloaded material. The calculated ratio of permanent deformation of the air cylinder along the circumferential direction and the axial direction is smaller than 0.5 percent, and is lower than the standard value, so that the requirement is met, and the next working condition d is carried out.
The working condition d, namely the durable working condition, does not consider the plasticity of materials, and the specific constraint and loading mode are the same as the above, the durable working condition of the air reservoir defined by the invention is a constant-amplitude durable working condition, the stress distribution of the air reservoir assembly under two internal pressures of 19bar and 4bar is respectively used as an upper limit value and a lower limit value to be led into FEMFAT software for durable analysis, the load cycle number is 20 ten thousand times, and the damage value <1 of the air reservoir assembly is calculated to meet the requirement. So far, the strength and durability simulation analysis of the air cylinder is completed.
Example five
Referring to fig. 16, an air cylinder structural strength durability simulation apparatus for an air suspension includes:
the determining module is used for determining boundary conditions of the strength durability simulation of the air cylinder;
the first design module is used for carrying out structural design on the cylinder body of the air cylinder based on a section topology optimization method;
the second design module is used for carrying out structural design on the air cylinder end cover based on a morphology optimization means;
the model building module is used for drawing a three-dimensional geometric model of the air reservoir by combining process conditions and material density distribution characteristics;
the simulation module is used for importing the geometrical model of the air reservoir into finite element analysis software, and establishing a grid model for strength durability simulation verification; if the strength durability meets the evaluation index, the calculation is finished; if the strength durability performance does not meet the evaluation index, carrying out local optimization or returning to the first design module or the second design module, and readjusting the optimization constraint condition until the air reservoir structure meets the strength durability performance requirement.
Example six
Fig. 17 is a block diagram of a terminal according to an embodiment of the present application, and the terminal may be a terminal according to the above embodiment. The terminal may be a portable mobile terminal such as: smart phone, tablet computer. Terminals may also be referred to by other names, user equipment, portable terminals, etc.
Generally, the terminal includes: a processor 301 and a memory 302.
Processor 301 may include one or more processing cores, such as a 4-core processor, an 8-core processor, and the like. The processor 301 may be implemented in at least one hardware form of DSP (Digital Signal Processing ), FPGA (Field-Programmable Gate Array, field programmable gate array), PLA (Programmable Logic Array ). The processor 301 may also include a main processor, which is a processor for processing data in an awake state, also called a CPU (Central Processing Unit ), and a coprocessor; a coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor 301 may integrate a GPU (Graphics Processing Unit, image processor) for rendering and drawing of content required to be displayed by the display screen. In some embodiments, the processor 301 may also include an AI (Artificial Intelligence ) processor for processing computing operations related to machine learning.
Memory 302 may include one or more computer-readable storage media, which may be tangible and non-transitory. Memory 302 may also include high-speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In some embodiments, a non-transitory computer readable storage medium in memory 302 is used to store at least one instruction for execution by processor 301 to implement a method of air reservoir structural strength durability simulation for an air suspension provided in the present application.
In some embodiments, the terminal may further optionally include: a peripheral interface 303, and at least one peripheral. Specifically, the peripheral device includes: at least one of radio frequency circuitry 304, touch screen 305, camera 306, audio circuitry 307, positioning component 308, and power supply 309.
The peripheral interface 303 may be used to connect at least one Input/Output (I/O) related peripheral to the processor 301 and the memory 302. In some embodiments, processor 301, memory 302, and peripheral interface 303 are integrated on the same chip or circuit board; in some other embodiments, either or both of the processor 301, the memory 302, and the peripheral interface 303 may be implemented on separate chips or circuit boards, which is not limited in this embodiment.
The Radio Frequency circuit 304 is configured to receive and transmit RF (Radio Frequency) signals, also known as electromagnetic signals. The radio frequency circuitry 304 communicates with a communication network and other communication devices via electromagnetic signals. The radio frequency circuit 304 converts an electrical signal into an electromagnetic signal for transmission, or converts a received electromagnetic signal into an electrical signal. Optionally, the radio frequency circuit 304 includes: antenna systems, RF transceivers, one or more amplifiers, tuners, oscillators, digital signal processors, codec chipsets, subscriber identity module cards, and so forth. The radio frequency circuitry 304 may communicate with other terminals via at least one wireless communication protocol. The wireless communication protocol includes, but is not limited to: the world wide web, metropolitan area networks, intranets, generation mobile communication networks (2G, 3G, 4G, and 5G), wireless local area networks, and/or WiFi (Wireless Fidelity ) networks. In some embodiments, the radio frequency circuitry 304 may also include NFC (Near Field Communication ) related circuitry, which is not limiting of the application.
The touch display screen 305 is used to display a UI (User Interface). The UI may include graphics, text, icons, video, and any combination thereof. The touch screen 305 also has the ability to collect touch signals at or above the surface of the touch screen 305. The touch signal may be input as a control signal to the processor 301 for processing. The touch screen 305 is used to provide virtual buttons and/or virtual keyboards, also known as soft buttons and/or soft keyboards. In some embodiments, the touch display 305 may be one, providing a front panel of the terminal; in other embodiments, the touch display screen 305 may be at least two, respectively disposed on different surfaces of the terminal or in a folded design; in still other embodiments, the touch display 305 may be a flexible display disposed on a curved surface or a folded surface of the terminal. Even more, the touch display screen 305 may be arranged in an irregular pattern that is not rectangular, i.e., a shaped screen. The touch display 305 may be made of LCD (Liquid Crystal Display ), OLED (Organic Light-Emitting Diode) or other materials.
The camera assembly 306 is used to capture images or video. Optionally, the camera assembly 306 includes a front camera and a rear camera. In general, a front camera is used for realizing video call or self-photographing, and a rear camera is used for realizing photographing of pictures or videos. In some embodiments, the number of the rear cameras is at least two, and the rear cameras are any one of a main camera, a depth camera and a wide-angle camera, so as to realize fusion of the main camera and the depth camera to realize a background blurring function, and fusion of the main camera and the wide-angle camera to realize a panoramic shooting function and a Virtual Reality (VR) shooting function. In some embodiments, camera assembly 306 may also include a flash. The flash lamp can be a single-color temperature flash lamp or a double-color temperature flash lamp. The dual-color temperature flash lamp refers to a combination of a warm light flash lamp and a cold light flash lamp, and can be used for light compensation under different color temperatures.
The audio circuit 307 is used to provide an audio interface between the user and the terminal. The audio circuit 307 may include a microphone and a speaker. The microphone is used for collecting sound waves of users and environments, converting the sound waves into electric signals, and inputting the electric signals to the processor 301 for processing, or inputting the electric signals to the radio frequency circuit 304 for voice communication. For the purpose of stereo acquisition or noise reduction, a plurality of microphones can be respectively arranged at different parts of the terminal. The microphone may also be an array microphone or an omni-directional pickup microphone. The speaker is used to convert electrical signals from the processor 301 or the radio frequency circuit 304 into sound waves. The speaker may be a conventional thin film speaker or a piezoelectric ceramic speaker. When the speaker is a piezoelectric ceramic speaker, not only the electric signal can be converted into a sound wave audible to humans, but also the electric signal can be converted into a sound wave inaudible to humans for ranging and other purposes. In some embodiments, the audio circuit 307 may also include a headphone jack.
The location component 308 is used to locate the current geographic location of the terminal to enable navigation or LBS (Location Based Service, location-based services). The positioning component 308 may be a positioning component based on the United states GPS (Global Positioning System ), the Beidou system of China, or the Galileo system of Russia.
The power supply 309 is used to power the various components in the terminal. The power source 309 may be alternating current, direct current, disposable or rechargeable. When the power source 309 comprises a rechargeable battery, the rechargeable battery may be a wired rechargeable battery or a wireless rechargeable battery. The wired rechargeable battery is a battery charged through a wired line, and the wireless rechargeable battery is a battery charged through a wireless coil. The rechargeable battery may also be used to support fast charge technology.
It will be appreciated by those skilled in the art that the structure shown in fig. 17 is not limiting of the terminal and may include more or fewer components than shown, or may combine certain components, or may employ a different arrangement of components.
Example seven
In an exemplary embodiment, there is also provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of simulating structural strength durability performance of an air cylinder for an air suspension according to all the inventive embodiments of the present application.
Any combination of one or more computer readable media may be employed. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
Example eight
In an exemplary embodiment, an application program product is also provided that includes one or more instructions that are executable by the processor 301 of the apparatus to perform the method of simulating structural strength durability of an air reservoir for an air suspension described above.
Although embodiments of the present invention have been disclosed above, they are not limited to the use listed in the description and modes of implementation. It can be applied to various fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. Therefore, the invention is not to be limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (10)
1. The method for simulating the structural strength and durability of the air cylinder for the air suspension is characterized by comprising the following steps of:
step one, determining boundary conditions of strength and durability simulation of the air cylinder;
step two, structural design is carried out on the cylinder body of the air cylinder based on a cross section topology optimization method;
thirdly, structural design is carried out on the end cover of the air cylinder based on a morphology optimization means;
drawing a three-dimensional geometric model of the air reservoir by combining process conditions and material density distribution characteristics;
Step five, importing the geometric model of the air reservoir in the step five into finite element analysis software, and establishing a grid model for simulation verification of strength durability performance; if the strength durability meets the evaluation index, the calculation is finished; if the strength durability performance does not meet the evaluation index, carrying out local optimization or returning to the second step and the third step, and readjusting the optimization constraint condition until the air reservoir structure meets the strength durability performance requirement.
2. The method for simulating structural strength and durability of an air cylinder for an air suspension according to claim 1, wherein the specific method of the first step is as follows:
determining minimum working pressure Q of air reservoir in normal operation min Maximum working pressure Q max And the minimum pressure Q when blasting occurs is three working conditions, and is defined as a severe working condition, and the severe working condition is defined as a boundary condition for the strength and durability simulation of the air cylinder.
3. The method for simulating structural strength and durability of an air cylinder for an air suspension according to claim 1, wherein the specific method of the second step is as follows:
21 Determining the maximum design space of the air reservoir according to the arrangement relation of the air reservoir peripheral suspension and other assemblies to obtain a closed contour line C along the circumferential direction of the cylinder 0 ；
22 Circumferential contour line C of cylinder body of air storage cylinder 0 Introducing finite element analysis software, creating a first barrel section 1 by taking the closed contour line as a boundary, and carrying out finite element grid division on the first barrel section 1 by adopting a two-dimensional quadrilateral shell unit;
23 Along a circumferential contour line C) 0 Two rows of quadrilateral units are respectively built along the normal direction and the opposite direction of the unit of the first cylinder section 1,the size of the unit is 2mm, and the newly created grid unit forms a second cylinder section 2, so that the normal direction of the second cylinder section 2 is ensured to be from inside to outside; the first cylinder section 1 and the second cylinder section 2 form a circumferential contour line C 0 A two-dimensional grid cell having a T-shaped cross-sectional profile feature;
24 Respectively placing the materials and the properties of the middle grid units of the first cylinder section 1 and the second cylinder section 2 into different groups, keeping the corresponding parameters consistent with the cylinders, and giving corresponding units;
25 Establishing topological optimization boundary conditions of the cylinder body of the air storage cylinder, and performing optimization calculation on the section of the cylinder body with the T-shaped section profile characteristics;
26 A cross-section topological optimization model is established.
4. The method for simulating structural strength and durability of an air cylinder for an air suspension according to claim 3, wherein the specific method of step 25) is as follows:
251 Defining the working condition of topology optimization assessment; uniformly distributing pressure load on grid cells of a corresponding group of the second cylinder section 2, wherein the load direction is consistent with the cell normal direction, and the load is equal to the minimum working pressure load Q of the air reservoir min Consistent;
252 Defining initial constraint conditions of the model; using inertial release as a model initial constraint;
253 Defining a design variable; defining grid cells of a corresponding group of the first barrel section 1 as a design area with optimized section topology, wherein each shell cell in the area is the minimum cell with variable density, and restraining the minimum dimension mindim value of the design area; defining the units of the corresponding group of the second cylinder section 2 as non-design areas;
254 Defining a response; including design region volume fraction response Volumefrac, overall compliance response complexation;
255 Defining constraint conditions; constraining the design variable by taking the volume fraction Volumafrac as a constraint condition;
256 Defining an objective function, submitting a topological optimization calculation model, defining the minimum overall flexibility as a target, and calculating to obtain a unit density distribution cloud picture on the first barrel section 1.
5. The method for simulating structural strength and durability of an air cylinder for an air suspension according to claim 1, wherein the specific method in the third step is as follows:
31 When a morphology optimization model is established for the cylinder body of the air cylinder by a section topology optimization method, extracting the middle surface of the end cover model, and carrying out two-dimensional shell cell grid division;
32 Defining a connecting ring surface of the end cover and the cylinder body as an undesigned area, and defining the rest curved surface part units as a signed area;
33 Defining the width, angle and height of the reinforcing ribs in the design area, or adding the distribution characteristics of the reinforcing ribs according to the structural characteristics of the end cover; selecting and defining other optimization parameters according to model characteristics, and finally submitting morphology optimization analysis;
34 And (3) establishing a morphology optimization model according to the morphology optimization analysis result.
6. The method for simulating structural strength and durability of an air cylinder for an air suspension according to claim 1, wherein the specific method in the fourth step is as follows:
and (3) deriving the optimization calculation results obtained in the second step and the third step in an STP format, and drawing a three-dimensional geometric model of the air reservoir by combining process conditions, material density distribution characteristics and internal volume requirements.
7. The method for simulating structural strength and durability of an air cylinder for an air suspension according to claim 1, wherein the specific method in the fifth step is as follows:
51 Establishing a finite element grid model based on the three-dimensional geometric model of the air reservoir obtained in the step four; dividing by adopting a second order tetrahedron C3DM10 entity unit;
52 Establishing a connection relationship between the components of the air reservoir; binding contact relation is established between the bracket and the cylinder body, and between the end cover and the cylinder body; the fixed point is connected with the ring surface node in the bolt hole of the bracket through a motion coupling constraint relationship;
53 Defining the materials of all parts of the air reservoir assembly; the method comprises the steps of carrying out assignment according to actual material attribute parameters, respectively defining material elastic modulus, poisson ratio and density value, and fitting a plastic constitutive equation of the material;
54 Calculating the load corresponding to different working conditions and submitting the load to calculation so as to judge the structural strength and durability of the air cylinder for the air suspension.
8. The utility model provides a gas receiver structural strength durability performance simulation device for air suspension which characterized in that includes:
the determining module is used for determining boundary conditions of the strength durability simulation of the air cylinder;
the first design module is used for carrying out structural design on the cylinder body of the air cylinder based on a section topology optimization method;
the second design module is used for carrying out structural design on the air cylinder end cover based on a morphology optimization means;
the model building module is used for drawing a three-dimensional geometric model of the air reservoir by combining process conditions and material density distribution characteristics;
the simulation module is used for importing the geometrical model of the air reservoir into finite element analysis software, and establishing a grid model for strength durability simulation verification; if the strength durability meets the evaluation index, the calculation is finished; if the strength durability performance does not meet the evaluation index, carrying out local optimization or returning to the first design module or the second design module, and readjusting the optimization constraint condition until the air reservoir structure meets the strength durability performance requirement.
9. A terminal, comprising:
one or more processors;
a memory for storing the one or more processor-executable instructions;
wherein the one or more processors are configured to:
a method for simulating structural strength durability of an air cylinder for an air suspension according to any one of claims 1 to 7 is performed.
10. A non-transitory computer readable storage medium, wherein instructions in the storage medium, when executed by a processor of a terminal, enable the terminal to perform a method of simulating structural strength durability of an air reservoir for an air suspension according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310542170.1A CN116702536A (en) | 2023-05-15 | 2023-05-15 | Method and device for simulating structural strength and durability of air cylinder for air suspension |
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| CN202310542170.1A CN116702536A (en) | 2023-05-15 | 2023-05-15 | Method and device for simulating structural strength and durability of air cylinder for air suspension |
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