CN112861400A - Shape optimization-based hat and coat stand modal performance design method - Google Patents
Shape optimization-based hat and coat stand modal performance design method Download PDFInfo
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- CN112861400A CN112861400A CN202110126678.4A CN202110126678A CN112861400A CN 112861400 A CN112861400 A CN 112861400A CN 202110126678 A CN202110126678 A CN 202110126678A CN 112861400 A CN112861400 A CN 112861400A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
Abstract
The invention relates to a method for designing modal performance of a hat rack based on morphology optimization, which comprises the following steps: step 1: calculating the result of the hat rack constraint mode: acquiring the size of a first-order mode of the hat rack, and knowing the difference between the size and a target; step 2: and (3) morphology optimization analysis: calculating the distribution result of the reinforcing ribs according to the parameter setting of the morphology optimization analysis model; and step 3: and (3) verifying an optimization scheme: and designing a reinforcing rib scheme convenient to manufacture according to the reinforcing rib distribution in the last step, carrying out modeling calculation on the scheme, verifying whether the result of the scheme meets the target, and if not, continuing optimization until the result reaches the standard. The invention solves the efficiency problem, repeatedly modifies the structure by experience, can meet the target requirement in limited time, and makes the modal performance design easier to realize.
Description
Technical Field
The invention belongs to the technical field of a modal performance design method, and particularly relates to the technical field of a design method of modal performance of a hat rack based on morphology optimization.
Background
The design of the sheet part in the prior art generally adopts a design flow, firstly an initial design is made, the lap joint with the peripheral part is made, then reinforcing ribs are arranged in the middle of the sheet part according to experience, CAE simulation analysis is carried out to verify whether the modal and rigidity performance of the sheet part meet the target, the design is finished if the target is met, otherwise, the sheet part is continuously modified until the target reaches the standard. The problems existing in the prior art are as follows: the prior art has the problems that when reinforcing ribs are arranged initially, designers are not clear how the arrangement is better, CAE simulation verification is carried out after delay only by experience, the target is not met, and the structure is modified until the target is met, so that the whole process period is long, and the efficiency is low.
Disclosure of Invention
The invention provides a design method of modal performance of a hat and coat stand based on morphology optimization to solve the defects of the problems. The invention is realized by adopting the following technical scheme.
A method for designing modal performance of a hat and coat stand based on morphology optimization comprises the following steps: step 1: calculating hat rack constraint modal results
Acquiring the size of a first-order mode of the hat rack, and knowing the difference between the size and a target;
step 2: morphology optimization analysis
Calculating the distribution result of the reinforcing ribs according to the parameter setting of the morphology optimization analysis model;
and step 3: validating an optimization scheme
And designing a reinforcing rib scheme convenient to manufacture according to the reinforcing rib distribution in the last step, carrying out modeling calculation on the scheme, verifying whether the result of the scheme meets the target, and if not, continuing optimization until the result reaches the standard.
Further, step 1 of the present invention specifically comprises: the method for acquiring the hat rack constraint modal result in the step 1 comprises the following steps:
step 1.1: making a modal analysis model;
cutting a metal plate structure on the periphery of the hat rack, wherein the distance between the edge of the cut section and the edge of the hat rack is 200mm, and restraining the cut part;
step 1.2: submitting calculation;
step 1.3: and reading the calculation result.
Further, the parameter setting of step 2 includes defining design variables, defining responses, defining constraints, and defining targets.
Further, step 3 of the present invention specifically includes: step 3, verifying the optimization scheme, comprising the following steps:
step 3.1: making a modal analysis model
Step 3.2: and establishing a finite element analysis model by the output model, and verifying the analysis result of the optimization scheme again.
Step 3.3: commit computation
Step 3.4: reading the calculation result
Further, step 2 of the present invention specifically comprises: step 2, defining morphology optimization analysis, comprising the following steps:
step 2.1: defining design variables
Independently establishing attributes of the hat and coat stand, and defining the attributes as design variables; continuously defining parameters such as width, height, angle and the like of the reinforcing ribs in the design variable card; defining a symmetry constraint;
step 2.2: defining a response
Defining a first order mode and quality as a response;
step 2.3: defining constraints
Defining the quality response constraint as less than or equal to the original hat and coat stand quality;
step 2.4: defining objects
The target is set to be the first-order modal maximum;
step 2.5: commit computation
Step 2.6: and reading the calculation result.
The device of the design method for the modal performance of the hat and coat stand based on the shape optimization is a 3D printer or a lathe or a milling machine or a machine tool.
The method has the beneficial effects that in the prior art, the structural design is firstly carried out, then the CAE analysis is carried out, the analysis is unqualified, the structure is modified, the CAE analysis is carried out for verification, and the steps are repeated until the standard is reached. According to the method, a flat plate structure is firstly made, so that morphology optimization analysis is carried out, and optimization calculation is carried out by a computer according to the theory of optimization calculation and the intention of an engineer, so that the arrangement form of the reinforcing ribs which theoretically meet the target is finally obtained. The optimization design of the invention takes the mathematical current as the theoretical basis, converts the physical model of the design problem into the mathematical model, applies the optimization mathematical theory, takes the computer and the application software as tools, and seeks the optimal design meeting the predetermined target under the premise of fully considering various design constraints. The optimization problem is solved through the powerful computing power of the computer, and the efficiency is higher than that of the structural design developed through the experience of engineers.
The invention solves the efficiency problem, repeatedly modifies the structure by experience, can meet the target requirement in limited time, and makes the modal performance design easier to realize.
The invention is further explained below with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a block diagram of the logic steps of the present invention.
FIG. 2 is a diagram of a model of modal analysis in step 1.1 of the present invention.
FIG. 3 is a diagram of the modal calculation results of step 1.3 of the present invention.
FIG. 4 is a diagram of the step 2.1 defined optimization model of the present invention.
FIG. 5 is a graph of the calculation result of step 2.2 of the present invention.
FIG. 6 is a diagram of a verification mode analysis model generated in step 3.1 of the present invention.
FIG. 7 is a diagram of a hat and coat stand model with the reinforcing ribs optimized according to the present invention.
Detailed Description
Referring to fig. 1, the hatrack is a relatively large metal plate, the periphery of the hatrack is connected with the vehicle body through welding points, the middle of the hatrack is of a flat plate structure and is not connected with the vehicle body, and the first-order mode of the hatrack is generally relatively low and cannot meet the requirement of modal planning of the whole vehicle; taking a coat and hat rack of a sedan as an example, the general steps of applying a morphology optimization technology to design modal performance are explained;
a method for designing modal performance of a hat and coat stand based on morphology optimization comprises the following steps: step 1: calculating hat rack constraint modal results
Acquiring the size of a first-order mode of the hat rack, and knowing the difference between the size and a target;
step 2: morphology optimization analysis
Calculating the distribution result of the reinforcing ribs according to the parameter setting of the morphology optimization analysis model;
and step 3: validating an optimization scheme
And designing a reinforcing rib scheme convenient to manufacture according to the reinforcing rib distribution in the last step, carrying out modeling calculation on the scheme, verifying whether the result of the scheme meets the target, and if not, continuing optimization until the result reaches the standard.
Further, step 1 of the present invention specifically comprises: the method for acquiring the hat rack constraint modal result in the step 1 comprises the following steps:
step 1.1: making a modal analysis model;
establishing a modal analysis model of the hat rack, as shown in fig. 2;
step 1.2: submitting calculation;
step 1.3: and reading the calculation result.
The result of the mode calculation of the hat rack is shown in fig. 3, the first-order mode frequency is 42.3Hz, and the result is lower and needs to be optimized;
further, step 2 of the present invention specifically comprises: step 2, defining morphology optimization analysis, comprising the following steps:
step 2.1: defining an optimization model
As shown in fig. 4, the original reinforcing ribs are filled in the white area, the area is defined as a design variable, the first-order modal frequency is defined as a response, the first-order modal frequency is defined as a target at the maximum, the constraint may not be defined, the height of the reinforcing ribs is defined as 10mm, and the angle is 60 degrees;
step 2.2: submitting calculation and reading results
The calculation results are shown in fig. 5, which shows the size and position of the optimized reinforcing bars;
further, step 3 of the present invention specifically includes: step 3, verifying the optimization scheme, comprising the following steps:
step 3.1: making a verification modal analysis model
Making a verification model by referring to the size and the position of the reinforcing ribs in the step 2.2, as shown in FIG. 6;
step 3.2: submitting calculations and reading results
As shown in FIG. 7, the frequency of the first-order mode of the hat rack after the reinforcing ribs are optimized to be 86.8Hz, and the frequency of the first-order mode of the hat rack is improved by 105 percent by the method.
The device of the design method for the modal performance of the hat and coat stand based on the shape optimization is a 3D printer or a lathe or a milling machine or a machine tool.
The above description is only a part of specific embodiments of the present invention (since the embodiments of the present invention are not exhaustive, the scope of the present invention is defined by the description scope of the present invention and other technical points), and the detailed contents or common general knowledge known in the schemes are not described herein too much. It should be noted that the above-mentioned embodiments do not limit the present invention in any way, and all technical solutions obtained by means of equivalent substitution or equivalent transformation for those skilled in the art are within the protection scope of the present invention. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (6)
1. A design method for modal performance of a hat and coat stand based on morphology optimization is characterized by comprising the following steps:
step 1: calculating hat rack constraint modal results
Acquiring the size of a first-order mode of the hat rack, and knowing the difference between the size and a target;
step 2: morphology optimization analysis
Calculating the distribution result of the reinforcing ribs according to the parameter setting of the morphology optimization analysis model;
and step 3: validating an optimization scheme
And designing a reinforcing rib scheme convenient to manufacture according to the reinforcing rib distribution in the last step, carrying out modeling calculation on the scheme, verifying whether the result of the scheme meets the target, and if not, continuing optimization until the result reaches the standard.
2. The method for designing modal performance of a hat and coat stand based on morphology optimization according to claim 1, wherein the step 1 specifically comprises: the method for acquiring the hat rack constraint modal result in the step 1 comprises the following steps:
step 1.1: making a modal analysis model;
cutting a metal plate structure on the periphery of the hat rack, wherein the distance between the edge of the cut section and the edge of the hat rack is 200mm, and restraining the cut part;
step 1.2: submitting calculation;
step 1.3: and reading the calculation result.
3. The method for designing modal performance of hatrack based on morphology optimization according to claim 1, wherein the parameter setting of the step 2 comprises defining design variables, defining responses, defining constraints and defining targets.
4. The method for designing modal performance of a hat and coat stand based on morphology optimization according to claim 1, wherein the step 3 is specifically as follows: step 3, verifying the optimization scheme, comprising the following steps:
step 3.1: making a modal analysis model
Step 3.2: and establishing a finite element analysis model by the output model, and verifying the analysis result of the optimization scheme again.
Step 3.3: commit computation
Step 3.4: and reading the calculation result.
5. The method for designing modal performance of a hat rack based on morphology optimization according to claim 3, wherein the step 2 is specifically as follows: step 2, defining morphology optimization analysis, comprising the following steps:
step 2.1: defining design variables
Independently establishing attributes of the hat and coat stand, and defining the attributes as design variables; continuously defining the width, height and angle parameters of the reinforcing ribs in the design variable card; defining a symmetry constraint;
step 2.2: defining a response
Defining a first order mode and quality as a response;
step 2.3: defining constraints
Defining the quality response constraint as less than or equal to the original hat and coat stand quality;
step 2.4: defining objects
The target is set to be the first-order modal maximum;
step 2.5: commit computation
Step 2.6: and reading the calculation result.
6. The device for designing the modal performance of the hat rack based on the morphology optimization according to the claims 1 to 5 is characterized in that the device is a 3D printer or a lathe or a milling machine or a machine tool.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110126678.4A CN112861400A (en) | 2021-01-29 | 2021-01-29 | Shape optimization-based hat and coat stand modal performance design method |
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| CN202110126678.4A CN112861400A (en) | 2021-01-29 | 2021-01-29 | Shape optimization-based hat and coat stand modal performance design method |
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| CN202110126678.4A Withdrawn CN112861400A (en) | 2021-01-29 | 2021-01-29 | Shape optimization-based hat and coat stand modal performance design method |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111125953A (en) * | 2019-12-18 | 2020-05-08 | 汉腾汽车有限公司 | Method for optimizing morphology of spare tire pit |
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- 2021-01-29 CN CN202110126678.4A patent/CN112861400A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111125953A (en) * | 2019-12-18 | 2020-05-08 | 汉腾汽车有限公司 | Method for optimizing morphology of spare tire pit |
Non-Patent Citations (1)
| Title |
|---|
| 李金龙等: "基于OptiStruct的某车身备胎池形貌优化设计", 《2015ALTAIR技术大会论文集》, pages 197 - 201 * |
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