CN112632807A - Modal optimization analysis method for dust cover of automobile disc brake - Google Patents
Modal optimization analysis method for dust cover of automobile disc brake Download PDFInfo
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- CN112632807A CN112632807A CN201910905583.5A CN201910905583A CN112632807A CN 112632807 A CN112632807 A CN 112632807A CN 201910905583 A CN201910905583 A CN 201910905583A CN 112632807 A CN112632807 A CN 112632807A
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- 239000000428 dust Substances 0.000 title claims abstract description 134
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000013433 optimization analysis Methods 0.000 title claims abstract description 24
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 65
- 238000005457 optimization Methods 0.000 claims abstract description 36
- 238000004364 calculation method Methods 0.000 claims abstract description 24
- 238000009826 distribution Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 abstract description 6
- 201000004569 Blindness Diseases 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000005284 excitation Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000877 morphologic effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
The invention discloses a mode optimization analysis method for a dust cover of an automobile disc brake, which comprises the following steps: s1: acquiring a structure of a dust cover of a disc brake, wherein the structure comprises a constraint surface, establishing a corresponding finite element model aiming at the structure of the dust cover of the disc brake, and extracting a first-order mode of the dust cover; s2: defining an entire plane parallel to the constraining surface as an optimizable region and the other portions of the dust shield as non-optimizable regions; adding arrangement parameters of reinforcing ribs to be arranged on the dust cover; s3: and performing form optimization calculation on the dust cover according to the first-order mode to obtain a configuration result of the reinforcing rib on the dust cover. Through the technical scheme, blindness of arrangement of the reinforcing ribs, limitation of weight and peripheral gaps can be avoided, and modal frequency of the dust cover is met.
Description
Technical Field
The invention relates to the technical field of automobile part optimization, in particular to a mode optimization analysis method for an automobile disc brake dust cover.
Background
The dust cover is generally bolted to the knuckle or pressed against the knuckle through a hub bearing and bolted together, and excitation of the tire from the road surface and excitation of the brake during operation are easily transmitted to the dust cover, and if the dust cover has a low mode, it is easily excited and resonates, and may cause the dust cover to vibrate violently and break, so the design must ensure that the mode frequency of the dust cover is higher than the highest frequency of excitation. The test of the acceleration at the dust cover mounting point in the road test process can confirm the frequency component of external excitation, so that the modal frequency target of the dust cover can be confirmed. However, as the mass of the whole vehicle is increased, the radius of the brake disc needs to be increased to ensure the braking performance, and the radius of the dust cover needs to be increased synchronously, but the fixing mode is invariable, the arrangement blindness of the reinforcing ribs and the limitation of the weight and the peripheral clearance cause that the modal frequency of the dust cover is difficult to meet.
However, in the prior art, there is no specific method for performing modal optimization analysis on an automobile brake dust cover, for example, only the structure of a car front brake dust cover or a connection structure of a brake dust cover is generally disclosed, or only a modal optimization method for an automobile exterior mirror is disclosed, but because the specific structure of the automobile exterior mirror and the brake dust cover is different, the specific implementation form of the automobile exterior mirror cannot be used as an effective reference, and thus, no effective technical hint is provided for the optimization method of a disc brake in the prior art.
Therefore, in this case, how to provide a modal optimization analysis method for the dust cover of the automobile disc brake is one of the technical problems to be solved by those skilled in the relevant field. More specifically, how to avoid the design engineer from modifying the digital-analog blindly is more critical to provide it with a stiffener layout solution that meets the modal design goal.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a modal optimization analysis method of an automobile disc brake dust cover.
In order to solve the technical problems, the technical scheme adopted by the invention specifically comprises the following contents:
a mode optimization analysis method for a dust cover of an automobile disc brake comprises the following steps:
s1: acquiring a structure of a dust cover of a disc brake, wherein the structure comprises a constraint surface, establishing a corresponding finite element model aiming at the structure of the dust cover of the disc brake, and extracting a first-order mode of the dust cover;
s2: defining an entire plane parallel to the constraining surface as an optimizable region and the other portions of the dust shield as non-optimizable regions; adding arrangement parameter types of the reinforcing ribs to be arranged on the dust cover, and setting or not setting the numerical values of the arrangement parameters;
s3: and performing form optimization calculation on the dust cover according to the first-order mode to obtain a configuration result of the reinforcing rib on the dust cover.
In order to solve the technical problems and achieve mode optimization analysis of the automobile disc brake dust cover, the inventor provides a method formed by the steps in the technical scheme, wherein firstly, a structure of the disc brake dust cover needs to be obtained, and the dust cover structure is a mounted structure. The dust cover can be installed in a pressing mode or a bolt fixing mode and the like, and a constraint surface is formed. The constraint surface is the area for fixed mounting on the dust cover. The constraint surfaces are used to subsequently distinguish between optimizable regions and non-optimizable regions in the model.
It should be noted that, the mode of defining the optimized region and the non-optimized region by the finite element model of the structure of the dust cover may be that the system itself is divided by identifying the range of the constraint surface; or the user can customize the division according to a finite element model of the structure of the dust cover including the constraining surfaces. The former can make analytic process and mode more convenient, and the latter can make the division more accurate, more is fit for actual requirement.
It should be noted that the reinforcing ribs need to be arranged in the optimizable region.
The mode of disposing the reinforcing ribs is obtained by performing shape optimization calculation on the dust cover according to the first-order mode of the dust cover by system software. The system software for performing the form optimization calculation can be an Opt i struct solver with Hyperworks or other related similar software or programs. In addition, the finite element model corresponding to the structure forming the dust cover can also be designed and constructed by using Hyperworks or related similar software.
Preferably, the reinforcing rib arrangement parameters comprise one or more of strike position, draft angle and draft depth.
More preferably, the strike location comprises a circumferential or radial direction along the compression surface.
It should be noted that the draft angle refers to draft, that is, draft of the mold, and is designed on both sides of the cavity for facilitating the demolding of the reinforcing bar.
It should be noted that the setting of the drawing depth generally does not interfere the rib with the peripheral member.
It should be noted that the orientation position refers to the arrangement orientation of the reinforcing ribs on the dust cover, for example, the orientation of the reinforcing ribs may be a circumferential direction in a designated plane, or may be a radial direction in a designated circle center position and a plane.
It should be noted that, setting various reinforcing rib layout parameters can make the obtained result clearer, and improve the applicability for actually setting the reinforcing ribs for subsequent users. Compared with the prior art that no specific arrangement parameter is set to obtain a more appropriate related output result of the reinforcing rib, the method provided by the invention considers the actual requirement of the optimization analysis method in the scheme in the further preferred embodiment, when the type of the arrangement parameter of the reinforcing rib is selected, one or more of the moving position, the die drawing angle and the die drawing depth are innovatively considered, and the moving position, the die drawing angle and the die drawing depth are preferably set simultaneously, so that the limited and obtained output result of the reinforcing rib is more accurate, and accurate and effective parameters can be provided for the subsequent practical design of the reinforcing rib.
Preferably, the configuration result of the reinforcing ribs on the dust cover obtained in S3 is a simulated distribution of the reinforcing ribs on a finite element model.
It should be noted that, if the form optimization calculation is performed by using the Opt i struct solver of Hyperworks, the configuration result of the reinforcing ribs on the dust cover is obtained in the form of the simulated distribution of the reinforcing ribs on the finite element model. The result of this formation is more direct, which may enable the user to directly actually lay out the reinforcing bars according to the result of the model.
Preferably, the finite element model is a 2D shell simulation of the dust cap.
It should be noted that, the finite element model formed by 2D shell simulation of the dust cover can constrain the 6-directional degree of freedom of the node of the constraint surface, so that the formation of the constraint surface is more objective and accurate, and the position accuracy can be improved for subsequent arrangement.
Preferably, the S3 further includes: when the values of the arrangement parameters are not set; and acquiring a reinforcing rib arrangement parameter result according to the configuration result of the reinforcing rib on the dust cover.
It should be noted that through this preferred procedure, more accurate results of the rib layout parameters can be obtained, facilitating the installation and setting of the actual reinforcing ribs. According to the configuration result of the reinforcing ribs on the dust cover, the mode of acquiring the arrangement parameter result of the reinforcing ribs can be self-calculation of a system, measurement and calculation of a user and the like.
Preferably, the S2 further includes: the ribs are arranged to remain symmetrical along the respective symmetry plane.
It should be noted that the reinforcing ribs are arranged to be symmetrical along the corresponding symmetrical planes, so that the subsequent actual forming and manufacturing process is simpler, the manufacturing cost is saved, and the installation is more convenient.
Preferably, the method for performing the form optimization calculation on the dust cover according to the first-order mode is as follows: and acquiring the maximum value of the first-order mode, and performing form optimization calculation on the dust cover to obtain a corresponding reinforcing rib arrangement parameter result.
It should be noted that, this structural optimization is performed for the fact that the modal frequency of the dust cover does not meet the standard, and at the same time, it is not desirable to increase the weight, and it is limited that the mass of the dust cover is fixed, and it better conforms to the setting and application of the actual dust cover, and it is also possible to eliminate other calculation results, so that the obtained result better conforms to the requirements, so this objective can be further stated as: the modal frequency of the dust cover is improved to the maximum extent on the premise of not increasing weight. The above calculation method can be obtained from this object.
Preferably, the method further comprises:
s4: and comparing the configuration result of the reinforcing ribs on the dust cover with a preset threshold value, and if the configuration result is smaller than the preset threshold value, returning to the step S2.
It should be noted that, in some cases, the configuration result obtained from the previous step or the previous steps cannot satisfy the requirement, and therefore, as a further preferable mode, the step of S4 is added as a result verification step, i.e., a preset threshold is set to compare with the configuration result. The preset threshold is in the form of a numerical value, that is, the configuration result is also a numerical value, and the numerical value can be directly compared, and if the configuration result is an analog distribution, the numerical value needs to be called out for comparison. When the configuration result is smaller than the preset threshold, it indicates that the satisfactory result is not achieved, and it is necessary to go back to S2 again to perform the region definition and parameter selection, and perform the morphological optimization calculation again. It should be noted that when the configuration result is smaller than the preset threshold, it is only a list of one specific embodiment that the unsatisfactory result is not achieved, and other comparison manners, such as whether the satisfactory result is achieved, should be regarded as equivalent embodiments.
Compared with the prior art, the invention has the beneficial effects that:
1. the method for analyzing the mode optimization of the dust cover of the automobile disc brake can realize the mode optimization analysis of the dust cover of the automobile disc brake, avoid the blindness of arrangement of the reinforcing ribs, and the limitation of weight and peripheral clearance, and meet the mode frequency of the dust cover;
2. according to the modal optimization analysis method of the dust cover of the automobile disc brake, the configuration result of the reinforcing ribs on the dust cover is obtained by performing the morphological optimization calculation on the dust cover according to the first-order mode of the dust cover, particularly the configuration result of the reinforcing ribs on the dust cover is the simulated distribution of the reinforcing ribs on a finite element model, so that the method is more direct, and a user can directly perform actual arrangement on the reinforcing ribs according to the result of the model;
3. according to the mode optimization analysis method for the dust cover of the automobile disc brake, the dust cover is subjected to a finite element model formed by 2D shell simulation, the 6-direction freedom degree of the dust cover can be restrained for the nodes of the restraining surface, the restraining surface is formed more objectively and accurately, and the position accuracy can be improved for subsequent arrangement;
4. according to the mode optimization analysis method for the dust cover of the automobile disc brake, the arrangement parameter result of the reinforcing ribs is obtained according to the configuration result of the reinforcing ribs on the dust cover, so that more accurate arrangement parameter result of the reinforcing ribs can be obtained, and the actual mounting and setting of the reinforcing ribs are facilitated;
5. according to the mode optimization analysis method for the dust cover of the automobile disc brake, the reinforcing ribs are arranged to be symmetrical along the corresponding symmetrical surfaces, so that the subsequent actual forming preparation process is simpler, the manufacturing cost is saved, and the installation is more convenient.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic flow chart of a preferred embodiment of a method for analyzing mode optimization of a dust cover of an automotive disc brake according to the present invention;
FIG. 2 is a schematic view of a dust cover installation structure in a preferred embodiment of the method for analyzing modal optimization of a dust cover of an automotive disc brake according to the present invention;
FIG. 3 is a schematic diagram of a finite element model of a dust cover in a preferred embodiment of the modal optimization analysis method of the dust cover of the automotive disc brake of the present invention;
FIG. 4 is a schematic diagram of a dust cover finite element model defining an optimizable region and an non-optimizable region in a preferred embodiment of the method for modal optimization analysis of a dust cover for an automotive disc brake of the present invention;
FIG. 5 is a schematic diagram of a first-order modal frequency optimization calculation process of a dust cover in a preferred embodiment of the method for analyzing the dust cover modal optimization of an automotive disc brake of the present invention;
FIG. 6 is a schematic diagram of the results obtained after the form optimization calculation in a preferred embodiment of the method for analyzing the dust cover mode optimization of the automobile disc brake according to the present invention;
FIG. 7 is a schematic diagram illustrating a reinforcement rib arrangement in a preferred embodiment of the method for analyzing modal optimization of a dust cover of an automotive disc brake according to the present invention;
wherein the reference symbols are:
1. a dust cover;
2. a knuckle;
3. bolt holes;
4. a hub bearing;
5. a compression surface;
A. an optimizable area;
B. a non-optimizable area;
C. a plane of symmetry.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects according to the present invention with reference to the accompanying drawings and preferred embodiments is as follows:
fig. 1 is a schematic flow chart of a preferred embodiment of a method for analyzing mode optimization of a dust cover of an automotive disc brake according to the present invention, which includes the following steps:
s1: acquiring a structure of a dust cover of a disc brake, wherein the structure comprises a constraint surface, establishing a corresponding finite element model aiming at the structure of the dust cover of the disc brake, and extracting a first-order mode of the dust cover;
s2: defining an entire plane parallel to the constraining surface as an optimizable region and the other portions of the dust shield as non-optimizable regions; adding arrangement parameters of reinforcing ribs to be arranged on the dust cover;
s3: and performing form optimization calculation on the dust cover according to the first-order mode to obtain a configuration result of the reinforcing rib on the dust cover.
In a specific embodiment, the dust cover of the disc brake can be structured in various mounting modes. Referring to fig. 2, which is a schematic structural view of one embodiment of a dust cover for a disc brake, in fig. 2, the dust cover 1 is pressed by a hub bearing 4 and both end faces of a knuckle 2 and is connected together by bolts and bolt holes 3.
In another aspect, a specific embodiment of a finite element model of the dust cover with the above structure can be seen in fig. 3, which is a structure of the dust cover according to fig. 2, wherein a pressing surface 5 is further included as a constraining surface, and the finite element model of the dust cover is built in hyperborks software according to the installation manner of the dust cover on the whole vehicle. In a more specific implementation mode, the 2D shell units are adopted to perform meshing on the dust cover, and 6-direction freedom of the mesh nodes in the area of the compression surface is restrained, so that the compression surface is formed more objectively and accurately, and the position accuracy can be improved for subsequent arrangement. Then, an analysis step of modal analysis is further established, and the first-order mode of the dust cover is extracted.
Fig. 4 is a schematic diagram of the software defining the finite element model obtained above. In fig. 4, the finite element model can be divided into an optimizable region a and an non-optimizable region B. As a further embodiment, the reinforcing ribs may be provided in a form forming symmetry along the symmetry plane C. The reinforcing ribs are arranged to be symmetrical along the corresponding symmetrical surfaces, so that the subsequent actual forming preparation process is simpler, the manufacturing cost is saved, and the installation is more convenient.
In another aspect, in combination with the above embodiment, it is necessary to add an arrangement parameter of the reinforcing ribs to be provided on the dust cover. In a more specific embodiment, the kind of the arrangement parameters, such as one or more of the strike position, the draft angle, and the draft depth, may be defined first.
In another embodiment, specific values of the parameters may be further set in addition to the kinds of the above-described arrangement parameters. Compared with the implementation mode of only adding the type of the arrangement parameters of the reinforcing ribs, the implementation mode is defined more specifically, namely, a user defines more specific conditions, and the subsequent software only needs to perform form optimization calculation according to the conditions defined by the user, so that a more specific model result which is more in line with the requirements of the user can be obtained. For example, in a specific embodiment, the ribs are arranged to run in the circumferential direction of the annular dust cover, the draft angle is set to 60 ° in consideration of the requirement of the press forming manufacturing process, the clearance between the dust cover and the peripheral member is taken into consideration to ensure that the dust cover does not interfere with the peripheral member, and the rib punching depth is set to 6 mm. It should be noted that the contents of the trend position can also be understood as a numerical value, and the trend position can be defined and set by different numerical values. In the embodiment, the calculated reinforcing rib is a model display, which mainly displays that the drawing depth, the drawing angle and the reinforcing rib trend are consistent with those set by my earlier stage, and most importantly, the specific arrangement position of the reinforcing rib is provided, and according to the position, a product design engineer can refer to the corresponding position to establish a digital model and perform detailed design.
In combination with the above embodiment, in another aspect, the form optimization calculation of the dust cover is performed according to the first-order mode. In a more specific embodiment, the extracted dust cap first order mode frequency in S1 is first set as the profile optimization response, and the maximum (max) response, i.e., the highest dust cap first order mode, is set as the profile optimization goal.
In a more specific embodiment, a specific process of optimization calculation may be that an Opt i struct solver provided by hyperborks is used for performing optimization calculation, as shown in fig. 5, after the iterative calculation of topography optimization, it can be seen that the first-order modal frequency of the dust cover is increased from the initial 83Hz to the final 102Hz, the obtained arrangement position and size of the reinforcing ribs of the dust cover with the first-order modal frequency of 102Hz are shown in fig. 6, and the reinforcing ribs are arranged in a digital-analog manner according to the optimization result of fig. 6, so that the reinforcing rib distribution shown in fig. 7 is finally obtained.
In combination with the above embodiment, in another aspect, when the value of the arrangement parameter is not set, the result of the arrangement parameter of the reinforcing ribs is obtained according to the configuration result of the reinforcing ribs in the dust cover, and the user can perform the actual arrangement of the reinforcing ribs according to this result.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (9)
1. A mode optimization analysis method for a dust cover of an automobile disc brake is characterized by comprising the following steps:
s1: acquiring a structure of a dust cover of a disc brake, wherein the structure comprises a constraint surface, establishing a corresponding finite element model aiming at the structure of the dust cover of the disc brake, and extracting a first-order mode of the dust cover;
s2: defining an entire plane parallel to the constraining surface as an optimizable region and the other portions of the dust shield as non-optimizable regions; adding arrangement parameter types of the reinforcing ribs to be arranged on the dust cover, and setting or not setting the numerical values of the arrangement parameters;
s3: and performing form optimization calculation on the dust cover according to the first-order mode to obtain a configuration result of the reinforcing rib on the dust cover.
2. The modal optimization analysis method of an automotive disc brake dust cover according to claim 1, wherein the reinforcing rib arrangement parameters include one or more of strike position, draft angle and draft depth.
3. The method for modal optimization analysis of an automotive disc brake dust cover according to claim 2, wherein the orientation position comprises a circumferential or radial direction along the compression surface.
4. The modal optimization analysis method for a dust cover of an automotive disc brake as recited in claim 1, wherein the configuration result of the reinforcing ribs on the dust cover obtained in S3 is a simulated distribution of the reinforcing ribs on a finite element model.
5. The method of modal optimization analysis of an automotive disc brake dust cover of claim 4, wherein the finite element model is a 2D shell simulation of the dust cover.
6. The analysis method for modal optimization of a dust cover of an automotive disc brake as set forth in claim 4, wherein the S3 further comprises: and when the numerical value of the arrangement parameter is not set, obtaining the arrangement parameter result of the reinforcing ribs according to the configuration result of the reinforcing ribs on the dust cover.
7. The analysis method for modal optimization of a dust cover of an automotive disc brake as set forth in claim 1, wherein the S2 further comprises: the ribs are arranged to remain symmetrical along the respective symmetry plane.
8. The method for modal optimization analysis of an automotive disc brake dust cover according to claim 1, wherein the method for performing the form optimization calculation on the dust cover according to the first-order mode is as follows: and acquiring the maximum value of the first-order mode, and performing form optimization calculation on the dust cover to obtain a corresponding reinforcing rib arrangement parameter result.
9. The method for modal optimization analysis of an automotive disc brake dust cover as recited in claim 1, further comprising:
s4: and comparing the configuration result of the reinforcing ribs on the dust cover with a preset threshold value, and if the configuration result is smaller than the preset threshold value, returning to the step S2.
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| CN201910905583.5A CN112632807A (en) | 2019-09-24 | 2019-09-24 | Modal optimization analysis method for dust cover of automobile disc brake |
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2019
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