CN116776699A - Method for analyzing sealing performance of shell of automobile electric drive system - Google Patents
Method for analyzing sealing performance of shell of automobile electric drive system Download PDFInfo
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Abstract
The invention discloses a method for analyzing the sealing performance of a shell of an automobile electric drive system, which belongs to the technical field of automobiles and specifically comprises the following steps: geometry model importation: importing a geometric model of the reducer shell assembly into Hypermesh software, checking the model and performing geometric cleaning; modeling and assembling finite elements of a speed reducer shell assembly; establishing boundary constraint conditions; loading finite element model load; submitting a calculation: generating inp files for finite element calculation in Hypermesh software, and submitting calculation; analyzing the sealing performance of the reducer shell; and (5) evaluating the sealing performance of the reducer shell. The method has the advantages of standardized operation process, standardized calculation method and rapid analysis and evaluation of the sealing performance of the shell, and is beneficial to reducing the result error caused by manual operation, improving the simulation precision, shortening the research and development period and reducing the research and development cost.
Description
Technical Field
The invention belongs to the technical field of automobiles, and particularly relates to a method for analyzing the sealing performance of an automobile electric drive system shell.
Background
In engineering, when finite element analysis is performed on the sealing performance of the reducer shell, the sealing performance of the reducer shell is generally comprehensively evaluated by adopting the pressure of a joint surface, the opening amount and the displacement amount. The general method comprises the following operation processes: 1) Manually extracting the pressure of the joint surface of the shell, obtaining the maximum value and capturing a picture; 2) Manually extracting the opening amount of the joint surface of the shell, obtaining the maximum value and capturing a screenshot; 3) Because of the limitation of the functions of industrial software, engineers need to manually extract the offset components in the two degrees of freedom directions of the joint surface of the shell, calculate the offset of the joint surface through a formula, acquire the maximum value and capture a picture; 4) And (5) respectively comparing the 3 results with the evaluation standard by an engineer to evaluate the sealing performance of the speed reducer shell. The operation process is mechanically repeated, and the operation time is multiplied by the number of the matching surfaces of the shell along with the scale of the model.
The prior patent document (N202210601495.8) describes a method for calculating the sealing performance of an engine joint surface, which evaluates the sealing performance of the engine joint surface by the sealing pressure, the opening amount, the displacement amount, and the like. The calculation method is a general sealing performance calculation method, namely, the sealing pressure is manually extracted, the opening amount is manually extracted, the offset component is manually extracted, and the offset amount is calculated.
The prior patent document (CN 201911069967.4) describes a rubber structure seal analysis method for evaluating rubber sealing performance by automatically extracting contact pressure and generating a deformation-contact force relationship curve. The method does not involve automatic acquisition of the offset component and automatic calculation and presentation of the resultant and does not involve automatic extraction of the splay amount.
Therefore, it is necessary to find a more convenient and efficient analysis method for the sealing performance of the reducer housing.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the analysis method for the sealing performance of the shell of the automobile electric drive system, which has the advantages of standardized operation process, standardized calculation method and rapid analysis and evaluation of the sealing performance of the shell, and is beneficial to reducing the result error caused by manual operation, improving the simulation precision, shortening the research and development period and reducing the research and development cost.
The invention is realized by the following technical scheme:
the method for analyzing the sealing performance of the shell of the automobile electric drive system specifically comprises the following steps:
s1, importing a geometric model: importing a geometric model of the reducer shell assembly into Hypermesh software, checking the model and performing geometric cleaning;
s2, modeling and assembling finite element of a speed reducer shell assembly;
s3, establishing boundary constraint conditions;
s4, loading finite element model loads;
s5, submitting and calculating: generating inp files for finite element calculation in Hypermesh software, and submitting calculation;
s6, analyzing the sealing performance of the reducer shell: performing secondary development on the Hyperview software by using TCL/tk language, automatically importing a calculation result file, automatically extracting the contact pressure, the opening amount and the offset amount of the joint surface, and storing the screenshot in a specified position;
s7, evaluating the sealing performance of the reducer shell.
Further, in step S2, the following are specifically included:
the speed reducer shell assembly comprises a speed reducer shell, a gear shaft, gears, a bearing, a differential mechanism and bolts, all the components in the speed reducer shell assembly are respectively meshed, and then the components are assembled together by defining contact relation between contact components, and the materials are endowed with properties.
Further, in step S3, the boundary constraint condition of the finite element model is as follows:
s31, fixing bolt holes at the end part of a speed reducer shell so as to simulate the supporting effect of a motor on the speed reducer;
s32, the constraint of the rotational freedom degree of the gear shafts is applied between all gears of the speed reducer and bearings on two sides of the gears by means of RBE3 units, so that the path of torque transmitted from each gear shaft to a bearing hole of a shell of the speed reducer is interrupted.
Further, in step S4, the finite element model load includes:
s41, gear meshing force according to the maximum output torque M of the motor e The gear ratio and the gear load calculation formula are obtained and then applied to the meshing nodes of the corresponding gears;
s42, a bolt pretightening force is obtained by a relation between the bolt pretightening force and the bolt tightening torque, and then the bolt pretightening force is applied to the bolt.
Further, in step S6, the following are specifically included:
defining a result importing command through a TCL language, and automatically importing a calculation result file through defining a model file, a result file position and a name matching rule;
defining a command of extracting the contact pressure of the bonding surface and setting a cloud picture display and screenshot through TCL language, and realizing automatic extraction and screenshot of the contact pressure of the bonding surface;
defining a command for extracting the opening amount of the bonding surface by using a TCL language, setting a cloud picture display and screenshot command, and realizing automatic extraction and screenshot of the opening amount of the bonding surface;
defining a command of extracting a joint surface offset component, calculating the offset quantity, setting a cloud picture display and a screenshot through a TCL language, and realizing automatic extraction and screenshot of joint surface contact pressure;
the amount of the offset is calculated by using the formula (1):
wherein Cselip is the amount of displacement of the bonding surface, and Cslip 1 、cslip 2 The two degrees of freedom directions of the offset components are respectively available for industrial software.
In step S7, the evaluation of the sealing performance of the reducer casing is specifically that an evaluation criterion of the contact pressure, the opening amount and the displacement amount of the joint surface is predefined by TCL language, each calculation result is compared with the evaluation criterion, and the comparison result is presented at the front end, so that the sealing performance of the reducer casing is automatically evaluated.
Further, in step S7, the bonding surface contact pressure evaluation criteria are as follows: the continuous sealing pressure ring with the pressure larger than the preset pressure can be formed, and if the continuous sealing pressure ring with the pressure larger than the preset pressure cannot be formed on the joint surface through image recognition technology and numerical judgment, the contact pressure of the joint surface is judged to be unqualified.
Further, in step S7, the joint surface opening amount evaluation criteria are as follows: if the opening amount of the joint surface is smaller than 0.1mm, judging that the opening amount of the joint surface is qualified; if the opening amount of the joint surface is larger than 0.1mm, judging that the opening amount of the joint surface is unqualified.
Further, in step S7, the joint surface displacement amount evaluation criteria are as follows: if the joint surface offset is smaller than 0.08mm, judging that the joint surface offset is qualified; if the joint surface offset is greater than 0.08mm, judging that the joint surface offset is not qualified.
Further, in step S7, the speed reducer housing sealing performance evaluation criteria are as follows: all indexes are qualified, and the sealing performance of the shell of the speed reducer is qualified; if one index is unqualified, the sealing performance of the speed reducer shell is unqualified.
Compared with the prior art, the invention has the following advantages:
1) The invention can automatically extract the contact pressure of the bonding surface, obtain the maximum contact pressure and automatically capture the screenshot;
2) The invention can automatically extract the opening amount of the joint surface, obtain the maximum opening amount and automatically capture the screenshot;
3) The invention can automatically extract the component of the joint surface offset, calculate the offset amount, acquire the maximum offset amount and automatically screen capturing;
4) The invention can automatically and comprehensively evaluate the sealing performance;
5) The invention is suitable for the analysis of the sealing performance of all the shells of the automobile electric drive system;
6) The invention has the advantages of standardized operation process, standardized calculation method and rapid analysis and evaluation of the sealing performance of the shell, and is beneficial to reducing the result error caused by manual operation, improving the simulation precision, shortening the research and development period and reducing the research and development cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
FIG. 1 is a flow chart of a method for analyzing the sealing performance of a housing of an automotive electric drive system;
fig. 2 is a schematic diagram of a flow chart for analyzing the sealing performance of a reducer housing.
Detailed Description
For a clear and complete description of the technical scheme and the specific working process thereof, the following specific embodiments of the invention are provided with reference to the accompanying drawings in the specification:
in the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some 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 present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The method for analyzing the sealing performance of the shell of the automobile electric drive system specifically comprises the following steps:
s1, importing a geometric model: importing a geometric model of the reducer shell assembly into Hypermesh software, checking the model and performing geometric cleaning;
s2, modeling and assembling finite element of a speed reducer shell assembly;
s3, establishing boundary constraint conditions;
s4, loading finite element model loads;
s5, submitting and calculating: generating inp files for finite element calculation in Hypermesh software, and submitting calculation;
s6, analyzing the sealing performance of the reducer shell: and performing secondary development on the Hyperview software by using TCL/tk language, automatically importing a calculation result file, automatically extracting the contact pressure, the opening amount and the offset amount of the joint surface, and storing the screenshot in a specified position.
Example 1
As shown in fig. 1, a flow chart of a method for analyzing sealing performance of a housing of an automotive electric drive system according to the present embodiment is provided, and the method includes the following steps:
s1, importing a geometric model: importing a geometric model of the reducer shell assembly into Hypermesh software, checking the model and performing geometric cleaning;
s2, modeling and assembling finite element of a speed reducer shell assembly: the speed reducer shell assembly comprises a speed reducer shell, a gear shaft, a gear, a bearing, a differential mechanism, bolts and other parts, and all the parts in the speed reducer shell assembly are respectively subjected to grid division; the contacting components are then assembled together by defining a contacting relationship between them and imparting material properties.
In the embodiment, the reducer casing is generally made of aluminum, and the elastic modulus of the material is defined as 7.1e4MPa in Hypermesh software, and the Poisson ratio is 0.33; the gear shaft, the gear, the bearing and the like are steel materials, the elastic modulus of the material is 2.1e5 MPa in Hypermesh software, and the Poisson ratio is 0.3.
And the mutual matching surfaces of all parts of the reducer shell assembly are defined as contact relation, and the friction coefficient is 0.1.
S3, boundary condition constraint: the boundary conditions of the finite element model comprise two types, namely fixing bolt holes at the end part of a shell of the speed reducer so as to simulate the supporting effect of the motor on the speed reducer; and secondly, the constraint of the rotational freedom degree of the gear shafts is applied between all gears of the speed reducer and bearings on two sides of the gears by means of RBE3 units so as to interrupt the path of torque transmission from each gear shaft to a bearing hole of a shell of the speed reducer.
S4, loading finite element model load: the finite element model load comprises two types, namely gear meshing force according to the maximum output torque M of the motor e The gear ratio and the gear load calculation formula are obtained and then applied to the meshing nodes of the corresponding gears; and secondly, the bolt pretightening force is obtained by a relational expression between the bolt pretightening force and the bolt tightening torque and then is applied to the bolt.
S5, submitting and calculating: and generating inp files for finite element calculation in Hypermesh software, and submitting the calculation.
S6, analyzing the sealing performance of the reducer shell: and performing secondary development on the Hyperview software by using TCL/tk language, automatically importing a calculation result file, automatically extracting the contact pressure, the opening amount and the offset amount of the joint surface, and storing the screenshot in a specified position. The flow of analysis of the sealing performance of the reducer shell is shown in figure 2;
the result file importing command is defined through TCL language, which can be named as ImportResult, and its process parameters include model file and result file, which can be named as model_file and result_file respectively; the model file name and the result file name can be automatically matched with the result by defining a common character string.
Defining a command for automatically extracting and capturing the contact pressure of a bonding surface through a TCL language, defining the data type of a contourctrl_handle1 as 'CPRESS', acquiring the maximum value of the current result and automatically recording the maximum value as 'max_cpress'; the cloud graphic display is defined by the setLengennd command and appropriate visual graphic is intercepted and automatically recorded as "pic_cpress".
Defining a command for automatically extracting and capturing the opening of the combined surface through a TCL language, defining the data type of the contourctrl_handle1 as 'COPEN' and acquiring the maximum value of the current result and automatically recording the maximum value as 'max_copen'; the cloud graphic display is defined by the setLengennd command and the appropriate visual graphic is intercepted and automatically recorded as "pic_copen".
Defining a command for automatically extracting and capturing the joint surface offset through a TCL language, defining an offset amount calculation method, obtaining the maximum value of the result and automatically recording the maximum value as 'max_cslip'; the cloud graphic display is defined by the setLengennd command and the appropriate visual graphic is intercepted and automatically recorded as "pic_cslip". The amount of the offset is calculated by using the formula (1):
wherein Cselip is the amount of displacement of the bonding surface, and Cslip 1 、cslip 2 The two degrees of freedom directions of the offset components are respectively available for industrial software.
S7, evaluating the sealing performance of the reducer shell: the TCL language is used for predefining the evaluation standards of the contact pressure, the opening amount and the displacement amount of the joint surface, each calculation result is respectively compared with the evaluation standards, the front end of the comparison conclusion is presented, and the sealing performance of the reducer shell is automatically evaluated.
The bonding surface contact pressure evaluation criteria were: a continuous sealing pressure ring can be formed that is greater than a preset pressure. And judging that the contact pressure of the bonding surface is unqualified if the bonding surface cannot form a continuous sealing pressure ring which is larger than the preset pressure through the image recognition technology and the numerical judgment.
Setting a contact pressure cloud chart display legend, namely legend, displaying the part with the contact pressure of the bonding surface smaller than 10MPa as white, and judging whether the contact pressure of the bonding surface is qualified or not by identifying the white area range in the contact pressure screenshot pic_cpress of the bonding surface;
the bonding surface opening amount evaluation criteria were as follows: if the opening amount of the joint surface is smaller than 0.1mm, judging that the opening amount of the joint surface is qualified; if the opening amount of the joint surface is larger than 0.1mm, judging that the opening amount of the joint surface is unqualified.
Comparing the maximum value max_copen of the expansion amount with an evaluation standard, and automatically judging whether the expansion amount of the joint surface is qualified or not;
the joint face misalignment amount evaluation criteria were as follows: if the joint surface offset is smaller than 0.08mm, judging that the joint surface offset is qualified; if the joint surface offset is greater than 0.08mm, judging that the joint surface offset is not qualified.
Comparing the maximum value max_cslip of the displacement amount with an evaluation standard, and automatically judging whether the displacement amount of the joint surface is qualified or not;
the evaluation criteria for the sealing performance of the reducer shell are as follows: all indexes are qualified, and the sealing performance of the shell of the speed reducer is qualified; if one index is unqualified, the sealing performance of the speed reducer shell is unqualified.
And (3) automatically evaluating the sealing performance of the speed reducer shell and pushing the speed reducer shell to the front end of software by combining the comparison results of the pic_cpress, the max_copen and the max_cslip with the evaluation standard. Such as "poor seal performance of the reducer housing". Wherein, the displacement of the joint surface is 0.23mm, and the joint surface is unqualified. "
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (10)
1. The method for analyzing the sealing performance of the shell of the automobile electric drive system is characterized by comprising the following steps of:
s1, importing a geometric model: importing a geometric model of the reducer shell assembly into Hypermesh software, checking the model and performing geometric cleaning;
s2, modeling and assembling finite element of a speed reducer shell assembly;
s3, establishing boundary constraint conditions;
s4, loading finite element model loads;
s5, submitting and calculating: generating inp files for finite element calculation in Hypermesh software, and submitting calculation;
s6, analyzing the sealing performance of the reducer shell: performing secondary development on the Hyperview software by using TCL/tk language, automatically importing a calculation result file, automatically extracting the contact pressure, the opening amount and the offset amount of the joint surface, and storing the screenshot in a specified position;
s7, evaluating the sealing performance of the reducer shell.
2. The method for analyzing the sealing performance of a housing of an automotive electric drive system according to claim 1, wherein in step S2, the method specifically comprises the following steps:
the speed reducer shell assembly comprises a speed reducer shell, a gear shaft, gears, a bearing, a differential mechanism and bolts, all the components in the speed reducer shell assembly are respectively meshed, and then the components are assembled together by defining contact relation between contact components, and the materials are endowed with properties.
3. The method for analyzing the sealing performance of a housing of an automotive electric drive system according to claim 1, wherein in the step S3, the boundary constraint condition of the finite element model is as follows:
s31, fixing bolt holes at the end part of a speed reducer shell so as to simulate the supporting effect of a motor on the speed reducer;
s32, the constraint of the rotational freedom degree of the gear shafts is applied between all gears of the speed reducer and bearings on two sides of the gears by means of RBE3 units, so that the path of torque transmitted from each gear shaft to a bearing hole of a shell of the speed reducer is interrupted.
4. The method for analyzing the sealing performance of a housing of an automotive electric drive system according to claim 1, wherein in step S4, the finite element model load includes:
s41, gear meshing force according to the maximum output torque M of the motor e The gear ratio and the gear load calculation formula are obtained and then applied to the meshing nodes of the corresponding gears;
s42, a bolt pretightening force is obtained by a relation between the bolt pretightening force and the bolt tightening torque, and then the bolt pretightening force is applied to the bolt.
5. The method for analyzing the sealing performance of a housing of an automotive electric drive system according to claim 1, wherein in step S6, the method specifically comprises the following steps:
defining a result importing command through a TCL language, and automatically importing a calculation result file through defining a model file, a result file position and a name matching rule;
defining a command of extracting the contact pressure of the bonding surface and setting a cloud picture display and screenshot through TCL language, and realizing automatic extraction and screenshot of the contact pressure of the bonding surface;
defining a command for extracting the opening amount of the bonding surface by using a TCL language, setting a cloud picture display and screenshot command, and realizing automatic extraction and screenshot of the opening amount of the bonding surface;
defining a command of extracting a joint surface offset component, calculating the offset quantity, setting a cloud picture display and a screenshot through a TCL language, and realizing automatic extraction and screenshot of joint surface contact pressure;
the amount of the offset is calculated by using the formula (1):
wherein Cselip is the amount of displacement of the bonding surface, and Cslip 1 、cslip 2 The two degrees of freedom directions of the offset components are respectively available for industrial software.
6. The method for analyzing the sealing performance of the shell of the automotive electric drive system according to claim 1, wherein in the step S7, the evaluation of the sealing performance of the shell of the speed reducer is specifically to predefine the evaluation criteria of the contact pressure, the opening amount and the displacement amount of the joint surface by TCL language, each calculation result is compared with the evaluation criteria respectively, and the front end of the comparison result is presented to automatically evaluate the sealing performance of the shell of the speed reducer.
7. The method for analyzing sealing performance of a housing of an automotive electric drive system according to claim 6, wherein in step S7, the bonding surface contact pressure evaluation criteria are as follows: the continuous sealing pressure ring with the pressure larger than the preset pressure can be formed, and if the continuous sealing pressure ring with the pressure larger than the preset pressure cannot be formed on the joint surface through image recognition technology and numerical judgment, the contact pressure of the joint surface is judged to be unqualified.
8. The method for analyzing sealing performance of a housing of an automotive electric drive system according to claim 6, wherein in step S7, the joint surface opening amount evaluation criteria are as follows: if the opening amount of the joint surface is smaller than 0.1mm, judging that the opening amount of the joint surface is qualified; if the opening amount of the joint surface is larger than 0.1mm, judging that the opening amount of the joint surface is unqualified.
9. The method for analyzing sealing performance of a housing of an automotive electric drive system according to claim 6, wherein in step S7, the joint surface displacement amount evaluation criteria are as follows: if the joint surface offset is smaller than 0.08mm, judging that the joint surface offset is qualified; if the joint surface offset is greater than 0.08mm, judging that the joint surface offset is not qualified.
10. The method for analyzing the sealing performance of a housing of an automotive electric drive system according to claim 1, wherein in step S7, the evaluation criteria of the sealing performance of the housing of the speed reducer are as follows: all indexes are qualified, and the sealing performance of the shell of the speed reducer is qualified; if one index is unqualified, the sealing performance of the speed reducer shell is unqualified.
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