CN116205116B - CAE analysis method and system for evaluating strength of corrugated pipe - Google Patents
CAE analysis method and system for evaluating strength of corrugated pipe Download PDFInfo
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- CN116205116B CN116205116B CN202310496157.7A CN202310496157A CN116205116B CN 116205116 B CN116205116 B CN 116205116B CN 202310496157 A CN202310496157 A CN 202310496157A CN 116205116 B CN116205116 B CN 116205116B
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Abstract
The invention discloses a CAE analysis method and a system for evaluating the strength of a corrugated pipe, wherein the method specifically comprises the following steps: establishing a finite element temperature field analysis model of the exhaust hot end system, and performing temperature field analysis of the exhaust hot end system to obtain a temperature field distribution result of the exhaust hot end system, wherein the temperature field distribution result of the exhaust hot end system comprises a temperature field distribution result of the corrugated pipe body; establishing an exhaust hot end system finite element frequency response analysis model by taking a temperature field distribution result of an exhaust hot end system as a boundary, loading target vibration excitation, and carrying out exhaust hot end system frequency response analysis to obtain a relative displacement analysis result of two ends of the corrugated pipe body; the invention takes the temperature field distribution result of the corrugated pipe body and the relative displacement analysis result of the two ends of the corrugated pipe body as boundaries to carry out static strength analysis of the corrugated pipe, and the strain analysis result of the corrugated pipe body under high temperature and vibration is examined, so that the invention provides a low-cost analysis method for evaluating the strength of the corrugated pipe.
Description
Technical Field
The invention relates to the technical field of engine analysis, in particular to a CAE analysis method and system for evaluating the strength of a corrugated pipe.
Background
The bellows of an Exhaust Gas Recirculation (EGR) system of an engine is subjected to flushing of high-temperature gas and vibration excitation of the engine in the working process, and is prone to cracking and failure, and in the design process of the EGR bellows, the strength of the bellows needs to be evaluated and analyzed so that the bellows can bear high-temperature vibration excitation.
The existing strength evaluation method of the corrugated pipe mainly comprises a special vibration test and a CAE analysis method, wherein the special vibration test is to fix two ends of the corrugated pipe on a special vibration test table, load vibration acceleration excitation on the test table, the acceptance standard of the test is to bear 1000 ten thousand times of vibration, the whole test duration period is long, the special vibration test is carried out at normal temperature and is not matched with the actual working condition of the corrugated pipe, and the strength of the corrugated pipe under severe working conditions cannot be accurately evaluated.
The existing analysis method for the strength CAE of the corrugated pipe takes stress as an evaluation index, however, the stress of the material exceeds the yield strength, the material is subjected to plastic deformation, the stress exceeds the tensile limit of the material, the situation of fracture failure does not occur in the test, and the stress is difficult to be suitable for the analysis of the strength of the corrugated pipe under the severe working condition as the evaluation index.
Disclosure of Invention
The invention aims to improve and innovate the defects and problems existing in the background technology, and provides a CAE analysis method and system for evaluating the strength of a corrugated pipe.
According to a first aspect of the present invention, there is provided a CAE analysis method for evaluating strength of a bellows, comprising the steps of:
establishing a three-dimensional fluid model of the inner cavity of the corrugated pipe system, and carrying out in-pipe gas flow analysis to obtain the gas temperature and the heat exchange coefficient of the inner cavity of the corrugated pipe system;
establishing a finite element temperature field analysis model of the exhaust hot end system by taking the gas temperature and the heat exchange coefficient of the inner cavity of the corrugated pipe system as initial temperature boundaries, and carrying out temperature field analysis of the exhaust hot end system to obtain a temperature field distribution result of the exhaust hot end system, wherein the temperature field distribution result of the exhaust hot end system comprises a temperature field distribution result of a corrugated pipe body;
establishing an exhaust hot end system finite element frequency response analysis model by taking a temperature field distribution result of an exhaust hot end system as a boundary, loading target vibration excitation, and carrying out exhaust hot end system frequency response analysis to obtain a relative displacement analysis result of two ends of the corrugated pipe body;
establishing a static strength analysis model of the corrugated pipe body by taking a temperature field distribution result of the corrugated pipe body and a relative displacement analysis result of two ends of the corrugated pipe body as boundaries, and carrying out static strength analysis of the corrugated pipe to obtain a strain analysis result of the corrugated pipe body;
according to the temperature field distribution result of the corrugated pipe body, performing a fatigue test of the corrugated pipe body material at a corresponding temperature to obtain a strain-life curve of the corrugated pipe body material;
and obtaining the circulation times corresponding to the strain analysis result of the corrugated pipe body according to the strain-life curve, judging whether the circulation times of the corrugated pipe body are greater than a preset threshold value, and if so, enabling the strength of the corrugated pipe body to meet the design requirement.
According to the technical scheme, the temperature field analysis of the exhaust hot end system is carried out by establishing a finite element temperature field analysis model of the exhaust hot end system, so that the temperature field distribution result of the exhaust hot end system and the temperature field distribution result of the corrugated pipe body are obtained; then, taking the distribution result of the temperature field of the exhaust hot end system as a boundary, establishing a finite element frequency response analysis model of the exhaust hot end system, and carrying out frequency response analysis of the exhaust hot end system to obtain the analysis result of the relative displacement of the two ends of the corrugated pipe body, thereby considering the influence of temperature on the deformation of the corrugated pipe; and then the temperature field distribution result of the corrugated pipe body and the relative displacement analysis result of the two ends of the corrugated pipe body are used as boundaries, static strength analysis of the corrugated pipe is carried out, so that the obtained strain analysis result of the corrugated pipe body is matched with the strain suffered by the corrugated pipe under the high-temperature and severe vibration working conditions, the strain analysis result of the corrugated pipe body under the high-temperature and severe vibration working conditions is obtained, meanwhile, the obtained temperature field distribution result of the corrugated pipe body is used for guiding a material fatigue test to obtain a strain-life curve under the corresponding temperature, the strain analysis result obtained by taking the temperature field distribution result of the corrugated pipe body as the boundary is input, the number of circulation times is searched in the strain-life curve, the number of circulation times can be obtained, and the number of circulation times is used as a standard for evaluating the strength of the corrugated pipe to be clearer, thereby realizing that the strain analysis result is used for evaluating the strength of the corrugated pipe body, and solving the problem that the existing corrugated pipe strength CAE analysis method takes the stress as an evaluation index, the stress exceeds the material tensile limit, the situation that fracture failure cannot occur in the test, and the stress is difficult to be suitable for the analysis of the strength of the corrugated pipe under the severe working conditions.
The step of establishing the finite element frequency response analysis model of the exhaust hot end system by taking the temperature field distribution result of the exhaust hot end system as a boundary further comprises the following steps:
obtaining the elastic modulus and poisson ratio of the material at different temperatures through a material tensile test;
and endowing the elastic modulus and poisson ratio of each part of the exhaust hot end system at the corresponding temperature according to the temperature field distribution result of the exhaust hot end system.
According to the technical scheme, the elastic modulus and the Poisson ratio at the corresponding temperature are considered, so that the frequency response analysis model is more fit with the actual working condition, and the elastic modulus and the Poisson ratio of the temperature correction material are used for avoiding the problem that the obtained bellows body displacement is smaller due to the fact that the elastic modulus and the Poisson ratio at normal temperature are larger than those at high temperature, and the accuracy of the analysis result is improved.
The further scheme is that the step of loading target vibration excitation and carrying out frequency response analysis of an exhaust hot end system to obtain relative displacement analysis results of two ends of the corrugated pipe body specifically comprises the following steps:
arranging vibration acceleration sensors at the fixed connection positions of the exhaust hot end system, the cylinder body, the cylinder cover and the gearbox, and performing a real vehicle vibration test to obtain vibration excitation detected by the vibration acceleration sensors at different moments;
screening vibration excitation detected at different moments, and taking the maximum vibration excitation of each fixed connection position obtained by detection as target vibration excitation;
simplifying a fixed connection position corresponding to the finite element frequency response analysis model of the exhaust hot end system into a fixed boundary, and loading the target vibration excitation on the fixed boundary so as to carry out the frequency response analysis of the exhaust hot end system;
and establishing an engine coordinate system, and subtracting the displacement values of the air inlet end and the air outlet end of the corrugated pipe obtained under the coordinate system to obtain the relative displacement of the two ends of the corrugated pipe body.
According to the technical scheme, the target vibration excitation is loaded on the fixed boundary, and is the maximum vibration excitation obtained by the real vehicle vibration test, so that the frequency corresponding analysis model is attached to the large vibration working condition, the obtained relative displacement of the two ends of the corrugated pipe body is the maximum relative displacement, and the strength of the corrugated pipe body under the large vibration is considered.
The further scheme is that the step of establishing a static strength analysis model of the corrugated pipe body specifically comprises the following steps of:
extracting a corrugated pipe body grid unit from an exhaust hot end system finite element frequency response analysis model;
and fixing one end with a small frequency response analysis displacement value in the corrugated pipe body grid unit, adding the relative displacement to one end with a large frequency response analysis displacement value, and establishing a static strength analysis model of the corrugated pipe body by taking a temperature field distribution result of the corrugated pipe body as a load boundary.
The further scheme is that the step of establishing the static strength analysis model of the corrugated pipe body by taking the temperature field distribution result of the corrugated pipe body and the relative displacement analysis result of the two ends of the corrugated pipe body as boundaries further comprises the following steps:
obtaining plastic characteristics of the material at different temperatures through a material tensile test;
obtaining the linear expansion coefficients of the materials at different temperatures through a thermal physical property material test;
and endowing the plastic property and the linear expansion coefficient of each part of the corrugated pipe body at the corresponding temperature according to the temperature field distribution result of the corrugated pipe body.
According to the technical scheme, the plastic characteristic of the material at the corresponding temperature and the thermal expansion deformation of the material caused by the high temperature are considered, so that the static strength model is more fit with the actual working condition, and the accuracy of the analysis result is improved.
Further, if yes, after the step that the strength of the corrugated pipe body meets the design requirement, the method further includes:
if the circulation times of the corrugated pipe body are smaller than a preset threshold value, the corrugated quantity is increased or the wave height is increased in the CAD model corresponding to the corrugated pipe system.
Further, the step of establishing a three-dimensional fluid model of the lumen of the bellows system specifically includes:
establishing a CAD model of the corrugated pipe system;
extracting an inner cavity of the CAD model of the bellows system, and dividing grid units to obtain a three-dimensional fluid model of the inner cavity of the bellows system;
the CAD model of the corrugated pipe system comprises exhaust gas post-treatment, an EGR cooler and an EGR corrugated pipe, and the working condition of gas flow analysis is the rated rotation speed working condition of the engine.
According to a second aspect of the present invention, there is provided a CAE analysis system for evaluating strength of a bellows, comprising:
the gas flow analysis module is used for establishing a three-dimensional fluid model of the inner cavity of the corrugated pipe system, and carrying out in-pipe gas flow analysis to obtain the gas temperature and the heat exchange coefficient of the inner cavity of the corrugated pipe system;
the temperature field analysis module is used for establishing a finite element temperature field analysis model of the exhaust hot end system by taking the gas temperature and the heat exchange coefficient of the inner cavity of the corrugated pipe system as initial temperature boundaries, carrying out temperature field analysis of the exhaust hot end system, and obtaining a temperature field distribution result of the exhaust hot end system, wherein the temperature field distribution result of the exhaust hot end system comprises a corrugated pipe body temperature field distribution result;
the frequency response analysis module is used for establishing an exhaust hot end system finite element frequency response analysis model by taking the temperature field distribution result of the exhaust hot end system as a boundary, loading target vibration excitation, and carrying out exhaust hot end system frequency response analysis to obtain the relative displacement analysis result of the two ends of the corrugated pipe body;
the static strength analysis module is used for establishing a static strength analysis model of the corrugated pipe body by taking a temperature field distribution result of the corrugated pipe body and a relative displacement analysis result of two ends of the corrugated pipe body as boundaries, and carrying out static strength analysis of the corrugated pipe to obtain a strain analysis result of the corrugated pipe body;
the fatigue test module is used for carrying out a fatigue test on the corrugated pipe body material at the corresponding temperature according to the temperature field distribution result of the corrugated pipe body to obtain a strain-service life curve of the corrugated pipe body material;
the judging module is used for obtaining the circulation times corresponding to the strain analysis result of the corrugated pipe body according to the strain-life curve, judging whether the circulation times of the corrugated pipe body are larger than a preset threshold value, and if yes, the strength of the corrugated pipe body meets the design requirement.
Further, the frequency response analysis module includes:
the first endowing unit is used for obtaining the elastic modulus and the poisson ratio of the material at different temperatures through a material tensile test;
and endowing the elastic modulus and poisson ratio of each part of the exhaust hot end system at the corresponding temperature according to the temperature field distribution result of the exhaust hot end system body.
Further, the frequency response analysis module is specifically configured to:
arranging vibration acceleration sensors at the fixed connection positions of the exhaust hot end system, the cylinder body, the cylinder cover and the gearbox, and performing a real vehicle vibration test to obtain vibration excitation detected by the vibration acceleration sensors at different moments;
screening vibration excitation detected at different moments, and taking the maximum vibration excitation of each fixed connection position obtained by detection as target vibration excitation;
simplifying a fixed connection position corresponding to the finite element frequency response analysis model of the exhaust hot end system into a fixed boundary, and loading the target vibration excitation on the fixed boundary so as to perform the frequency response analysis of the bellows system;
and establishing an engine coordinate system, and subtracting the displacement values of the air inlet end and the air outlet end of the corrugated pipe obtained under the coordinate system to obtain the relative displacement of the two ends of the corrugated pipe body.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, a finite element temperature field analysis model of the exhaust hot end system is established, so that the temperature field analysis of the exhaust hot end system is carried out, and a temperature field distribution result of the exhaust hot end system and a temperature field distribution result of the corrugated pipe body are obtained; and the temperature field distribution result of the exhaust hot end system is taken as a boundary, a finite element frequency response analysis model of the exhaust hot end system is established, and the frequency response analysis of the exhaust hot end system is carried out to obtain the relative displacement analysis result of the two ends of the corrugated pipe body, so that the influence of temperature on the deformation of the corrugated pipe is considered; and then the temperature field distribution result of the corrugated pipe body and the relative displacement analysis result of the two ends of the corrugated pipe body are used as boundaries, static strength analysis of the corrugated pipe is carried out, so that the obtained strain analysis result of the corrugated pipe body is matched with the strain suffered by the corrugated pipe under the high-temperature and severe vibration working conditions, the strain analysis result of the corrugated pipe body under the high-temperature and severe vibration working conditions is obtained, meanwhile, the obtained temperature field distribution result of the corrugated pipe body is used for guiding a material fatigue test to obtain a strain-life curve under the corresponding temperature, the strain analysis result obtained by taking the temperature field distribution result of the corrugated pipe body as the boundary is input, the number of circulation times is searched in the strain-life curve, the number of circulation times can be obtained, and the number of circulation times is used as a standard for evaluating the strength of the corrugated pipe to be clearer, thereby realizing that the strain analysis result is used for evaluating the strength of the corrugated pipe body, and solving the problem that the existing corrugated pipe strength CAE analysis method takes the stress as an evaluation index, the stress exceeds the material tensile limit, the situation that fracture failure cannot occur in the test, and the stress is difficult to be suitable for the analysis of the strength of the corrugated pipe under the severe working conditions.
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, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a CAE analysis method for evaluating the strength of a bellows according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a CAE analysis system for evaluating strength of a bellows according to a second embodiment of the present invention;
FIG. 3 is a three-dimensional fluid model of the gas in the bellows system of the first embodiment of the present invention;
FIG. 4 is a diagram showing the finite element temperature field distribution results of the exhaust hot side system according to the first embodiment of the present invention;
FIG. 5 is a schematic diagram of an analysis model of the frequency response of the exhaust hot side system according to the first embodiment of the present invention;
FIG. 6 is a schematic view of a static strength analysis model of a bellows body according to a first embodiment of the present invention;
fig. 7 is a schematic diagram showing the results of static strength analysis strain on a bellows body according to the first embodiment of the present invention.
Detailed Description
In order that the objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1, an embodiment of the present invention provides a CAE analysis method for evaluating strength of a bellows, the method specifically includes the following steps:
step S1, a three-dimensional fluid model of an inner cavity of a corrugated pipe system is established, and in-pipe gas flow analysis is carried out to obtain the temperature and heat exchange coefficient of the inner cavity of the corrugated pipe system;
specifically, in order to build a three-dimensional fluid model of an inner cavity of a bellows system, a CAD model of an exhaust hot end system is built firstly, wherein the CAD model of the exhaust hot end system comprises a supercharger, exhaust aftertreatment, an EGR bellows, an EGR cooler and an EGR assembly, and in the embodiment, the bellows is the EGR bellows, wherein the exhaust aftertreatment, the EGR cooler and the EGR bellows form the bellows system; in order to obtain accurate temperature distribution of the EGR corrugated pipe body, modeling is required to be carried out on all parts connected with the EGR corrugated pipe body, wherein the modeling comprises exhaust aftertreatment and an EGR cooler, so that an inner cavity of a CAD model of a corrugated pipe system is extracted, grid cells are divided in Fire software, and a three-dimensional fluid model of the inner cavity of the corrugated pipe system is obtained, as shown in figure 3; and analyzing the gas flow in the pipe, wherein the analysis working condition is the rated rotation speed working condition of the engine, so as to obtain the temperature and heat exchange coefficient of the gas in the inner cavity of the corrugated pipe system under the rated rotation speed working condition of the engine, and the maximum gas temperature in the EGR corrugated pipe can reach 600 ℃ under the rated rotation speed working condition of the engine.
S2, establishing a finite element temperature field analysis model of the exhaust hot end system by taking the gas temperature and the heat exchange coefficient in the inner cavity of the corrugated pipe system as initial temperature boundaries, and carrying out temperature field analysis of the exhaust hot end system to obtain a temperature field distribution result of the exhaust hot end system, wherein the temperature field distribution result of the exhaust hot end system comprises a temperature field distribution result of a corrugated pipe body;
it should be noted that the finite element temperature field analysis model of the exhaust hot end system is obtained by dividing a grid unit by a CAD model of the exhaust hot end system, and the finite element temperature field analysis model of the exhaust hot end system is built in Abaqus software, wherein the grid unit of the EGR bellows is required to be thinned and prepared for subsequent stress analysis, and the size of the grid unit of the EGR bellows is 1-2mm, so that the subsequent frequency response analysis and static strength analysis can be used, and the modeling time is shortened.
Since the exhaust hot side system comprises a bellows system comprising a bellows body, the resulting temperature field distribution results of the exhaust hot side system comprise both the bellows system temperature field distribution results and the bellows body temperature field distribution results, as shown in fig. 4.
S3, establishing an exhaust hot end system finite element frequency response analysis model by taking a temperature field distribution result of an exhaust hot end system as a boundary, loading target vibration excitation, and carrying out exhaust hot end system frequency response analysis to obtain a relative displacement analysis result of two ends of the corrugated pipe body;
specifically, in Nastran software, the temperature field distribution result of the exhaust hot end system is taken as a boundary, meanwhile, the elastic modulus and the Poisson ratio of materials at different temperatures are measured through a material tensile test, the parameters are input into analysis software, and the software can automatically endow each part with the elastic modulus and the Poisson ratio at the corresponding temperatures according to the temperature field distribution result of the exhaust hot end system, so that the influence of the temperature on the elastic modulus and the Poisson ratio of the materials is considered.
In addition, the target vibration excitation is loaded, the target vibration excitation preferentially takes an actual measurement value (obtained by a vibration test), if the actual measurement value is not available, an empirical value can be used, wherein the empirical value is specifically 2g, 2g and 3g in the X/Y/Z direction, and the target vibration excitation is input into Nastran software to perform finite element frequency response analysis, so that the relative displacement analysis result of the two ends of the corrugated pipe body under the action of the target vibration excitation can be obtained.
The method for obtaining the analysis result of the relative displacement of the two ends of the corrugated pipe body by loading target vibration excitation specifically comprises the following steps:
step 301, arranging a vibration acceleration sensor at the fixed connection position of the exhaust hot end system and the component with high rigidity, and performing a real vehicle vibration test to obtain vibration excitation detected by the vibration acceleration sensor at different moments;
step 302, screening vibration excitation detected at different moments, and taking the maximum vibration excitation of each fixed connection position obtained by detection as target vibration excitation;
the maximum vibration excitation was set as the target vibration excitation, and the maximum relative displacement between the two ends of the bellows body was obtained in response.
Step 303, simplifying the fixed connection position corresponding to the finite element frequency response analysis model of the exhaust hot end system into a fixed boundary, and loading the target vibration excitation on the fixed boundary so as to analyze the frequency response of the exhaust hot end system;
the fixed connection part is generally a fixed bolt mounting hole connected with a component with high rigidity, for example, when the fixed connection part is connected with a component with high rigidity such as a cylinder body, a cylinder cover, a gearbox and the like, the component such as the cylinder body and the like does not need modeling, and a bolt hole connected with the fixed connection part is simplified into a fixed boundary; it will be appreciated that the different types of bellows system are different in fixing manner and number, and in this embodiment, there are 4 fixing portions in total, such as the transmission bolt mounting hole, the post-treatment bracket cylinder bolt mounting hole, the EGR cooler bracket cylinder bolt mounting hole, and the EGR cooler bracket cylinder bolt mounting hole of the post-treatment bracket in this order from left to right, as shown by the circle in fig. 5.
And 304, establishing an engine coordinate system, and subtracting the displacement values of the air inlet end and the air outlet end of the corrugated pipe obtained under the coordinate system to obtain the relative displacement of the two ends of the corrugated pipe body.
It should be noted that, by performing the analysis of the frequency response of the exhaust hot end system, the displacement values of the air inlet end and the air outlet end of the bellows body can be obtained, and then the relative displacement values of the air inlet end and the air outlet end of the bellows body in the X/Y/Z direction can be obtained by calculation.
S4, establishing a static strength analysis model of the corrugated pipe body by taking a temperature field distribution result of the corrugated pipe body and a relative displacement analysis result of two ends of the corrugated pipe body as boundaries, and carrying out static strength analysis of the corrugated pipe to obtain a strain analysis result of the corrugated pipe body;
specifically, the corrugated pipe network grid cells are extracted from the exhaust hot end system frequency response analysis model independently, namely, the grid cells of other components are deleted, only the grid cells of the corrugated pipe body are reserved, the corrugated pipe body static strength analysis model is built, as shown in fig. 6, the temperature field distribution result of the corrugated pipe body and the relative displacement result of two ends of the corrugated pipe body obtained through the steps are taken as boundaries, and meanwhile, the plastic characteristics and the linear expansion coefficient of the material of the corrugated pipe body are considered, so that the strain analysis result of the corrugated pipe body is obtained, as shown in fig. 7.
It should be noted that, fixing the end with small displacement value in the frequency response analysis by taking the relative displacement result of the two ends of the bellows body as the boundary, loading the end with large displacement value in the frequency response analysis with the relative displacement, considering the plastic property and the material linear expansion coefficient of the bellows body material to obtain the plastic property value and the material linear expansion coefficient value of the material at different temperatures through a material tensile test, and inputting the parameters into the Abaqus analysis software; the plastic property of each part of the corrugated pipe body at the corresponding temperature can be automatically endowed according to the temperature field distribution result of the corrugated pipe body.
S5, performing a fatigue test of the corrugated pipe body material at a corresponding temperature according to the temperature field distribution result of the corrugated pipe body to obtain a strain-life curve of the corrugated pipe body material;
specifically, according to the temperature field distribution result of the corrugated pipe body, loading a plurality of strain values at the temperature, performing fatigue test on the corrugated pipe body material to obtain cycle times corresponding to the strain values, establishing a two-dimensional coordinate system of the strain values and the cycle times, inputting the obtained strain values and the cycle times corresponding to the strain values into the two-dimensional coordinate system, so as to obtain a plurality of coordinate points, fitting the coordinate points into a line, and obtaining an epsilon-N (strain-life) curve. Wherein the number of cycles is the number of cycles that can withstand deformation of the strain value without breaking, and one cycle is the number of cycles that the bellows is deformed from no deformation to a corresponding strain value.
Step S6, according to the strain-life curve, the circulation times corresponding to the strain analysis result of the corrugated pipe body are obtained, and whether the circulation times of the corrugated pipe body are larger than a preset threshold value or not is judged;
specifically, according to the obtained strain analysis result, that is, the strain value of the bellows body, the corresponding cycle life is searched on an epsilon-N (strain-life) curve at the corresponding temperature, and whether the cycle number of the bellows body is greater than a preset threshold value is judged, wherein in the embodiment, the preset threshold value is set to 20000 times.
And S7, if yes, the strength of the corrugated pipe body meets the design requirement.
If the number of times of circulation of the corrugated pipe body is not greater than a preset threshold, the strength of the corrugated pipe body does not meet the design requirement, and the corrugated pipe body is optimized by increasing the number of waves or increasing the wave height in a CAD model corresponding to the corrugated pipe system.
In summary, by establishing a finite element temperature field analysis model of the exhaust hot end system, carrying out temperature field analysis of the exhaust hot end system to obtain a temperature field distribution result of the exhaust hot end system and a temperature field distribution result of the corrugated pipe body; and the temperature field distribution result of the exhaust hot end system is taken as a boundary, a finite element frequency response analysis model of the exhaust hot end system is established, and the frequency response analysis of the exhaust hot end system is carried out to obtain the relative displacement analysis result of the two ends of the corrugated pipe body, so that the influence of temperature on the deformation of the corrugated pipe is considered; and then the temperature field distribution result of the corrugated pipe body and the relative displacement analysis result of the two ends of the corrugated pipe body are used as boundaries, static strength analysis of the corrugated pipe is carried out, so that the obtained strain analysis result of the corrugated pipe body is matched with the strain suffered by the corrugated pipe under the high-temperature and severe vibration working conditions, the strain analysis result of the corrugated pipe body under the high-temperature and severe vibration working conditions is obtained, meanwhile, the obtained temperature field distribution result of the corrugated pipe body is used for guiding a material fatigue test to obtain a strain-life curve under the corresponding temperature, the strain analysis result obtained by taking the temperature field distribution result of the corrugated pipe body as the boundary is input, the number of circulation times is searched in the strain-life curve, the number of circulation times can be obtained, and the number of circulation times is used as a standard for evaluating the strength of the corrugated pipe to be clearer, thereby realizing that the strain analysis result is used for evaluating the strength of the corrugated pipe body, and solving the problem that the existing corrugated pipe strength CAE analysis method takes the stress as an evaluation index, the stress exceeds the material tensile limit, the situation that fracture failure cannot occur in the test, and the stress is difficult to be suitable for the analysis of the strength of the corrugated pipe under the severe working conditions.
Example 2
Referring to fig. 2, the present invention provides a CAE analysis system for evaluating strength of a bellows, which specifically includes:
the gas flow analysis module is used for establishing a three-dimensional fluid model of the inner cavity of the corrugated pipe system, and carrying out in-pipe gas flow analysis to obtain the gas temperature and the heat exchange coefficient of the inner cavity of the corrugated pipe system;
the temperature field analysis module is used for establishing a finite element temperature field analysis model of the exhaust hot end system by taking the gas temperature and the heat exchange coefficient of the inner cavity of the corrugated pipe system as initial temperature boundaries, carrying out temperature field analysis of the exhaust hot end system, and obtaining a temperature field distribution result of the exhaust hot end system, wherein the temperature field distribution result of the exhaust hot end system comprises a corrugated pipe body temperature field distribution result;
the frequency response analysis module is used for establishing an exhaust hot end system finite element frequency response analysis model by taking the temperature field distribution result of the exhaust hot end system as a boundary, loading target vibration excitation, and carrying out exhaust hot end system frequency response analysis to obtain the relative displacement analysis result of the two ends of the corrugated pipe body;
the static strength analysis module is used for establishing a static strength analysis model of the corrugated pipe body by taking a temperature field distribution result of the corrugated pipe body and a relative displacement analysis result of two ends of the corrugated pipe body as boundaries, and carrying out static strength analysis of the corrugated pipe to obtain a strain analysis result of the corrugated pipe body;
the fatigue test module is used for carrying out a fatigue test on the corrugated pipe body material at the corresponding temperature according to the temperature field distribution result of the corrugated pipe body to obtain a strain-service life curve of the corrugated pipe body material;
the judging module is used for obtaining the circulation times corresponding to the strain analysis result of the corrugated pipe body according to the strain-life curve, judging whether the circulation times of the corrugated pipe body are larger than a preset threshold value, and if yes, the strength of the corrugated pipe body meets the design requirement.
Optionally, the frequency response analysis module includes:
the first endowing unit is used for obtaining the elastic modulus and the poisson ratio of the material at different temperatures through a material tensile test;
and endowing the elastic modulus and poisson ratio of each part of the exhaust hot end system at the corresponding temperature according to the temperature field distribution result of the exhaust hot end system body.
Optionally, the frequency response analysis module is specifically configured to:
arranging vibration acceleration sensors at the fixed connection positions of the exhaust hot end system, the cylinder body, the cylinder cover and the gearbox, and performing a real vehicle vibration test to obtain vibration excitation detected by the vibration acceleration sensors at different moments;
screening vibration excitation detected at different moments, and taking the maximum vibration excitation of each fixed connection position obtained by detection as target vibration excitation;
simplifying a fixed connection position corresponding to the finite element frequency response analysis model of the exhaust hot end system into a fixed boundary, and loading the target vibration excitation on the fixed boundary so as to perform the frequency response analysis of the bellows system;
and establishing an engine coordinate system, and subtracting the displacement values of the air inlet end and the air outlet end of the corrugated pipe obtained under the coordinate system to obtain the relative displacement of the two ends of the corrugated pipe body.
Optionally, the static intensity analysis module includes:
the extraction unit is used for extracting the corrugated pipe body grid unit from the finite element frequency response analysis model of the exhaust hot end system;
the loading unit is used for fixing one end, close to exhaust pipe post-treatment, of the corrugated pipe body grid unit, loading the relative displacement on one end, far away from the exhaust pipe post-treatment, of the corrugated pipe body grid unit, taking a temperature field distribution result of the corrugated pipe body as a load boundary, and establishing a static strength analysis model of the corrugated pipe body.
Optionally, the static intensity analysis module includes:
a giving unit for obtaining plastic properties of the material at different temperatures by a material tensile test;
and endowing the plastic characteristics of each part of the corrugated pipe body with corresponding temperature according to the temperature field distribution result of the corrugated pipe body.
Optionally, the method further comprises:
and the modification module is used for increasing the number of the waves or increasing the wave height in the CAD model when the cycle number of the corrugated pipe body is smaller than a preset threshold value.
Optionally, the gas flow analysis module is specifically configured to:
establishing a CAD model of the corrugated pipe system;
extracting an inner cavity of the CAD model of the bellows system, and dividing grid units to obtain a three-dimensional fluid model of the inner cavity of the bellows system;
the CAD model of the corrugated pipe system comprises exhaust gas post-treatment, an EGR cooler and an EGR corrugated pipe, and the working condition of gas flow analysis is the rated rotation speed working condition of the engine.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the invention.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application for the embodiment. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. The CAE analysis method for evaluating the strength of the corrugated pipe is characterized by comprising the following steps of:
establishing a three-dimensional fluid model of the inner cavity of the corrugated pipe system, and carrying out in-pipe gas flow analysis to obtain the gas temperature and the heat exchange coefficient of the inner cavity of the corrugated pipe system;
establishing a finite element temperature field analysis model of the exhaust hot end system by taking the gas temperature and the heat exchange coefficient of the inner cavity of the corrugated pipe system as initial temperature boundaries, and carrying out temperature field analysis of the exhaust hot end system to obtain a temperature field distribution result of the exhaust hot end system, wherein the temperature field distribution result of the exhaust hot end system comprises a temperature field distribution result of a corrugated pipe body;
establishing an exhaust hot end system finite element frequency response analysis model by taking a temperature field distribution result of an exhaust hot end system as a boundary, loading target vibration excitation, and carrying out exhaust hot end system frequency response analysis to obtain a relative displacement analysis result of two ends of the corrugated pipe body;
taking the temperature field distribution result of the corrugated pipe body and the relative displacement analysis result of the two ends of the corrugated pipe body as boundaries, and obtaining the plastic characteristics of the material at different temperatures through a material tensile test; obtaining the linear expansion coefficients of the materials at different temperatures through a thermal physical property material test; according to the temperature field distribution result of the corrugated pipe body, endowing the plastic characteristics and linear expansion coefficients of each part of the corrugated pipe body at corresponding temperatures, establishing a static strength analysis model of the corrugated pipe body, and carrying out static strength analysis of the corrugated pipe to obtain a strain analysis result of the corrugated pipe body;
according to the temperature field distribution result of the corrugated pipe body, performing a fatigue test of the corrugated pipe body material at a corresponding temperature to obtain a strain-life curve of the corrugated pipe body material;
and obtaining the circulation times corresponding to the strain analysis result of the corrugated pipe body according to the strain-life curve, judging whether the circulation times of the corrugated pipe body are greater than a preset threshold value, and if so, enabling the strength of the corrugated pipe body to meet the design requirement.
2. The CAE analysis method for evaluating a strength of a bellows according to claim 1, wherein the step of establishing a finite element frequency response analysis model of the exhaust hot side system with a result of a temperature field distribution of the exhaust hot side system as a boundary further comprises:
obtaining the elastic modulus and poisson ratio of the material at different temperatures through a material tensile test;
and endowing the elastic modulus and poisson ratio of each part of the exhaust hot end system at the corresponding temperature according to the temperature field distribution result of the exhaust hot end system.
3. The CAE analysis method for evaluating strength of a bellows according to claim 1 or 2, wherein the step of loading target vibration excitation, performing analysis of frequency response of an exhaust hot end system, and obtaining analysis results of relative displacement of two ends of a bellows body specifically comprises:
arranging vibration acceleration sensors at the fixed connection positions of the exhaust hot end system, the cylinder body, the cylinder cover and the gearbox, and performing a real vehicle vibration test to obtain vibration excitation detected by the vibration acceleration sensors at different moments;
screening vibration excitation detected at different moments, and taking the maximum vibration excitation of each fixed connection position obtained by detection as target vibration excitation;
simplifying a fixed connection position corresponding to the finite element frequency response analysis model of the exhaust hot end system into a fixed boundary, and loading the target vibration excitation on the fixed boundary so as to carry out the frequency response analysis of the exhaust hot end system;
and establishing an engine coordinate system, and subtracting the displacement values of the air inlet end and the air outlet end of the corrugated pipe obtained under the coordinate system to obtain the relative displacement of the two ends of the corrugated pipe body.
4. A CAE analysis method for evaluating strength of a bellows according to claim 3, wherein the step of establishing a static strength analysis model of the bellows body is specifically performed by taking a temperature field distribution result of the bellows body and a relative displacement analysis result of both ends of the bellows body as boundaries:
extracting a corrugated pipe body grid unit from an exhaust hot end system finite element frequency response analysis model;
and fixing one end with a small frequency response analysis displacement value in the corrugated pipe body grid unit, loading the opposite displacement at one end with a large frequency response analysis displacement value, and establishing a static strength analysis model of the corrugated pipe body by taking a temperature field distribution result of the corrugated pipe body as a load boundary.
5. The CAE analysis method for evaluating strength of a bellows according to claim 4, wherein, after the step of if the strength of the bellows body meets the design requirement, further comprising:
if the circulation times of the corrugated pipe body are smaller than the preset threshold, modifying a CAD model corresponding to the corrugated pipe system, and increasing the corrugated quantity or increasing the wave height in the CAD model.
6. The CAE analysis method for evaluating strength of a bellows according to claim 1, wherein the step of establishing a three-dimensional fluid model of an inner cavity of the bellows system for in-tube gas flow analysis specifically comprises:
establishing a CAD model of the corrugated pipe system;
extracting an inner cavity of the CAD model of the bellows system, and dividing grid units to obtain a three-dimensional fluid model of the inner cavity of the bellows system;
the CAD model of the corrugated pipe system comprises exhaust gas post-treatment, an EGR cooler and an EGR corrugated pipe, and the working condition of gas flow analysis is the rated rotation speed working condition of the engine.
7. A CAE analysis system for evaluating bellows strength, comprising:
the gas flow analysis module is used for establishing a three-dimensional fluid model of the inner cavity of the corrugated pipe system, and carrying out in-pipe gas flow analysis to obtain the gas temperature and the heat exchange coefficient of the inner cavity of the corrugated pipe system;
the temperature field analysis module is used for establishing a finite element temperature field analysis model of the exhaust hot end system by taking the gas temperature and the heat exchange coefficient of the inner cavity of the corrugated pipe system as initial temperature boundaries, carrying out temperature field analysis of the exhaust hot end system, and obtaining a temperature field distribution result of the exhaust hot end system, wherein the temperature field distribution result of the exhaust hot end system comprises a corrugated pipe body temperature field distribution result;
the frequency response analysis module is used for establishing an exhaust hot end system finite element frequency response analysis model by taking the temperature field distribution result of the exhaust hot end system as a boundary, loading target vibration excitation, and carrying out exhaust hot end system frequency response analysis to obtain the relative displacement analysis result of the two ends of the corrugated pipe body;
the static strength analysis module is used for obtaining the plastic characteristics of the material at different temperatures through a material tensile test by taking the temperature field distribution result of the corrugated pipe body and the relative displacement analysis result of the two ends of the corrugated pipe body as boundaries; obtaining the linear expansion coefficients of the materials at different temperatures through a thermal physical property material test; according to the temperature field distribution result of the corrugated pipe body, endowing the plastic characteristics and linear expansion coefficients of each part of the corrugated pipe body at corresponding temperatures, establishing a static strength analysis model of the corrugated pipe body, and carrying out static strength analysis of the corrugated pipe to obtain a strain analysis result of the corrugated pipe body;
the fatigue test module is used for carrying out a fatigue test on the corrugated pipe body material at the corresponding temperature according to the temperature field distribution result of the corrugated pipe body to obtain a strain-service life curve of the corrugated pipe body material;
the judging module is used for obtaining the circulation times corresponding to the strain analysis result of the corrugated pipe body according to the strain-life curve, judging whether the circulation times of the corrugated pipe body are larger than a preset threshold value, and if yes, the strength of the corrugated pipe body meets the design requirement.
8. The CAE analysis system for evaluating strength of a bellows of claim 7, wherein the frequency response analysis module comprises:
the first endowing unit is used for obtaining the elastic modulus and the poisson ratio of the material at different temperatures through a material tensile test;
and endowing the elastic modulus and poisson ratio of each part of the exhaust hot end system at the corresponding temperature according to the temperature field distribution result of the exhaust hot end system body.
9. The CAE analysis system for evaluating strength of a bellows of claim 7 or 8, wherein the frequency response analysis module is specifically configured to:
arranging vibration acceleration sensors at the fixed connection positions of the exhaust hot end system, the cylinder body, the cylinder cover and the gearbox, and performing a real vehicle vibration test to obtain vibration excitation detected by the vibration acceleration sensors at different moments;
screening vibration excitation detected at different moments, and taking the maximum vibration excitation of each fixed connection position obtained by detection as target vibration excitation;
simplifying a fixed connection position corresponding to the finite element frequency response analysis model of the exhaust hot end system into a fixed boundary, and loading the target vibration excitation on the fixed boundary so as to perform the frequency response analysis of the bellows system;
and establishing an engine coordinate system, and subtracting the displacement values of the air inlet end and the air outlet end of the corrugated pipe obtained under the coordinate system to obtain the relative displacement of the two ends of the corrugated pipe body.
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