CN112560183A - Automobile damping patch position optimization method and system - Google Patents
Automobile damping patch position optimization method and system Download PDFInfo
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- CN112560183A CN112560183A CN202011525788.XA CN202011525788A CN112560183A CN 112560183 A CN112560183 A CN 112560183A CN 202011525788 A CN202011525788 A CN 202011525788A CN 112560183 A CN112560183 A CN 112560183A
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- 238000013016 damping Methods 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005457 optimization Methods 0.000 title claims description 20
- 238000004458 analytical method Methods 0.000 claims abstract description 62
- 238000013461 design Methods 0.000 claims abstract description 22
- 238000010206 sensitivity analysis Methods 0.000 claims abstract description 21
- 238000012546 transfer Methods 0.000 claims abstract description 15
- 230000035945 sensitivity Effects 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims description 25
- 238000004088 simulation Methods 0.000 claims description 14
- 238000006073 displacement reaction Methods 0.000 claims description 13
- 230000005855 radiation Effects 0.000 claims description 13
- 238000011549 displacement method Methods 0.000 claims description 7
- 230000005284 excitation Effects 0.000 claims description 7
- 238000012795 verification Methods 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000013433 optimization analysis Methods 0.000 abstract description 2
- 238000001308 synthesis method Methods 0.000 abstract description 2
- 238000011960 computer-aided design Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 238000012938 design process Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
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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
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/10—Noise analysis or noise optimisation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention discloses a method and a system for optimizing the position of an automobile damping patch, which aim at damping optimization and sensitivity analysis aiming at risk frequency in a targeted manner by establishing a finite element model of a body-in-white and combining an effective sound power analysis method and a modal synthesis method for use, carrying out sensitivity analysis on a confirmed damping patch, finding out a position with high sensitivity according to a sensitivity analysis result to carry out primary arrangement design on the damping patch, finally carrying out Trimbody noise transfer function analysis on a potential damping patch, and optimizing a scheme with obvious right ear response of a driver after adding the damping patch.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a method and a system for optimizing the position of an automobile damping patch.
Background
With the rapid development of scientific technology, the requirements of consumers on the quality of automobiles are higher and higher, and particularly the vibration noise performance is concerned more and more, wherein the damping sheet which is one of the measures for improving the vibration noise is more and more widely applied in the field of automobile NVH.
In the early development process of the automobile, more accurate position analysis may be provided by early CAE intervention due to various reasons such as structure, cost, period and the like, a frequency response method is adopted by a plurality of host factories, the method is based on the analysis of a body-in-white, divides a large sheet metal of the body-in-white into a plurality of small blocks, applies excitation to key points of a chassis, carries out statistical analysis through response results to obtain a relatively weak area of a body structure, the method has long time spent on front and back treatment, higher cost, no defect of error control compared with test data in the design process, no pertinence on optimization frequency, only can be verified by various schemes in real vehicles, the support to the problems of the actual vehicle is not ideal enough, the position of the damping fin can not be well supported for optimization and improvement, therefore, it is necessary to design a method and a system for optimizing the position of the damping patch of the vehicle to solve the above technical problems. .
Disclosure of Invention
In order to solve the technical problems, the invention relates to a method and a system for optimizing the position of an automobile damping patch, which effectively solve the technical problems by adopting a means of combining simulation analysis and experimental analysis and are suitable for popularization and use
A method for optimizing the position of an automobile damping patch comprises the following steps:
s101, obtaining design input conditions through project product definition;
s102, establishing a CAD model for the body-in-white according to the design input conditions;
s103, establishing a finite element model of the body in white based on the CAD model;
s104, performing modal analysis on the finite element model to obtain a modal analysis result;
s105, carrying out modal test on the body-in-white to obtain a modal test result;
s106, performing benchmarking on the modal analysis result and the modal test result;
s107, optimizing the finite element model according to the benchmarking result, improving the simulation precision and controlling the modal frequency and the error of the vibration mode result to be less than 5%;
s108, performing equivalent radiation acoustic power analysis on the finite element model, distinguishing the maximum radiation position of the structural plate by combining a simulation result, and preliminarily determining the position to which the damping fin should be applied;
s109, based on a modal comprehensive displacement method, superposing all modal displacements of the white automobile body within the frequency range of 20-200Hz, wherein the superposed modal displacements have a reference threshold value, and performing damping arrangement;
s110, carrying out topology optimization on peak frequency according to the analysis result of the Trimbody noise transfer function, and thus preliminarily locking the position to which the damping fin should be applied;
s111, carrying out sensitivity analysis on the primarily locked damping fins, and finding out the position with high sensitivity according to the sensitivity analysis result to carry out primary layout design on the damping fins;
and S112, carrying out Trimbody noise transfer function analysis on the arranged damping fins, and carrying out position and size verification on the scheme which has obvious right ear response of the driver after the damping fins are added by combining the analysis result.
On the basis of the above scheme and as a preferable scheme of the scheme: and S103, importing the data of the CAD model into a finite element preprocessor, and performing meshing in the finite element preprocessor to establish the finite element model of the body-in-white.
On the basis of the above scheme and as a preferable scheme of the scheme: and S105, performing modal test on the body-in-white by adopting a vibration exciter excitation method, and performing modal frequency extraction on each point response data to obtain modal frequency data, modal damping ratio and vibration mode data of the body-in-white.
On the basis of the above scheme and as a preferable scheme of the scheme: and S108, performing equivalent radiated acoustic power analysis on the finite element model, respectively applying unit forces in three directions to key attachment points of a vehicle body and a chassis, wherein the excitation frequency range is 50-500Hz, and calculating to obtain an equivalent radiated acoustic power analysis result.
The invention also relates to a system for optimizing the position of the automobile damping patch, which comprises,
the acquisition module is used for defining and acquiring design input conditions for the project product;
the building module is used for building a CAD model for the body-in-white according to the design input conditions;
the model processing module is used for establishing a finite element model of the body in white based on the CAD model;
the modal analysis module is used for carrying out modal analysis on the finite element model to obtain a modal analysis result;
the modal testing module is used for carrying out modal testing on the body-in-white to obtain a modal testing result;
the modal benchmarking module is used for benchmarking the modal analysis result and the modal test result;
the judgment module is used for optimizing the finite element model according to the benchmarking result, improving the simulation precision and controlling the modal frequency and the vibration mode result error to be less than 5%;
the damping analysis module is used for carrying out equivalent radiation acoustic power analysis on the finite element model, distinguishing the maximum radiation position of the structural plate by combining a simulation result, preliminarily determining the position to which the damping fin should be applied, and can also be used for a modal comprehensive displacement method, superposing all modal displacements of the white automobile body within the frequency range of 20-200Hz, wherein the superposed modal displacements have a reference threshold value, and carrying out damping arrangement;
the topology optimization module is used for carrying out topology optimization on the peak frequency according to the analysis result of the Trimbody noise transfer function, so that the position where the damping fin should be applied is locked preliminarily;
the sensitivity analysis module is used for carrying out sensitivity analysis on the primarily locked damping fin and finding out a position with high sensitivity according to the sensitivity analysis result to carry out primary arrangement design on the damping fin;
and the scheme verification module is used for carrying out Trimbody noise transfer function analysis on the arranged damping fin and verifying the position and size of the scheme with obvious right ear response of the driver after the damping fin is added by combining the analysis result.
Compared with the prior art, the invention has the outstanding and beneficial technical effects that: the method and the device have the advantages that the equivalent acoustic power analysis method and the modal synthesis method are combined for use, damping optimization and sensitivity analysis are performed on risk frequencies in a targeted mode, the damping fins at corresponding positions are subjected to sensitivity analysis, the positions with high sensitivity are found according to the sensitivity analysis result, damping fin primary arrangement design is performed, Trimbody noise transfer function analysis is performed on potential damping fins, a scheme with obvious right ear response of a driver is optimized after the damping fins are added, and scheme landing is finally promoted after the scheme is verified.
Drawings
FIG. 1 is a flowchart of a method for optimizing the position of an automobile damping patch according to an embodiment of the present invention;
FIG. 2 is a finite element model diagram of a body-in-white of an automobile according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a result of an equivalent acoustic power analysis method according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating a modal synthesis displacement method according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a topology optimization result provided in the embodiment of the present invention;
FIG. 6 is a comparison graph of sound pressure curves of the right ear of the driver at a point before and after the vehicle passes through the damping sheet according to the embodiment of the present invention;
fig. 7 is a diagram of a system for optimizing the position of an automobile damping patch according to an embodiment of the present invention.
Detailed Description
In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments, however, the specific embodiments and embodiments described below are only for illustrative purposes and are not intended to limit the present invention.
Example one
Referring to fig. 1, the invention relates to a method for optimizing the position of an automobile damping patch, which comprises the following steps:
s101, obtaining design input conditions through project product definition;
s102, taking a body-in-white as a research and development vehicle model, and establishing a CAD (computer-aided design) model for the body-in-white according to the design input conditions, wherein the CAD model comprises information such as material thickness, materials, welding points, structural adhesive and the like;
s103, as shown in FIG. 2, importing the data of the CAD model into a finite element preprocessor, and performing grid division in the finite element preprocessor to establish a finite element model of the body-in-white, wherein the divided unit grids are endowed with correct material properties and thicknesses, the unit type shell unit is Pshell, and the body unit is Psolid; assembling a body-in-white grid model, simulating spot welding by adopting acm units, simulating welding lines by adopting rigid RBE units, and setting the adhesive type as adhesives;
s104, performing modal analysis on the finite element model to obtain a modal analysis result, wherein the modal analysis result comprises modal frequency data and modal array type data of the finite element model, and focuses on the integral modes of first-order bending and first-order torsion, and local modes within 200Hz, such as a launder, a front windshield cross beam, a front wall, a floor, a top cover, a side wall and the like;
s105, performing modal test on the body-in-white by adopting a vibration exciter excitation method, and performing modal frequency extraction on response data of each point to obtain a modal test result, wherein the modal test result comprises modal frequency data, modal damping ratio and vibration mode data of the body-in-white;
s106, performing benchmarking on the modal analysis result and the modal test result, and finding out the difference between a finite element model and a body-in-white;
s107, optimizing the finite element model according to the benchmarking result, improving the simulation precision and controlling the modal frequency and the error of the vibration mode result to be less than 5%;
s108, performing equivalent radiation acoustic power analysis on the finite element model, respectively applying unit forces in three directions to key attachment points of a vehicle body and a chassis, wherein the excitation frequency range is 50-500Hz, obtaining an equivalent radiation acoustic power analysis result through calculation as shown in FIG. 3, distinguishing the maximum radiation position of the structural plate by combining a simulation result, and preliminarily determining the position to which the damping fin should be applied;
s109, based on a modal comprehensive displacement method, superposing all modal displacements of the white automobile body within the frequency range of 20-200Hz, as shown in FIG. 4, to obtain a region with larger displacement, wherein the superposed modal displacements have a reference threshold value, and thus, damping arrangement is performed;
s110, carrying out topology optimization on the peak frequency according to the analysis result of the Trimbody noise transfer function, wherein as shown in FIG. 5, the optimization design variable is a body-in-white, the constraint condition is that the weight is minimum, and the objective function is that the peak frequency is minimum. Obtaining a topology optimization result through multi-round optimization iterative calculation, and thus preliminarily locking the position to which the damping fin should be applied, mainly comprising a ceiling, a floor, a front wall and the like;
s111, carrying out sensitivity analysis on the primarily locked damping fins, and finding out the position with high sensitivity according to the sensitivity analysis result to carry out primary layout design on the damping fins;
s112, Trimbody noise transfer function analysis is carried out on the arranged damping fins, position and size verification is carried out on the scheme which has obvious right ear response of the driver after the damping fins are added by combining the analysis result, the optimization effect is shown in FIG. 6, a solid line in the diagram is a noise transfer function of a certain point of a basic vehicle type, a dotted line is a damping fin position effect optimized according to simulation, and the scheme can be pushed to land after verification is completed.
As shown in fig. 7, the present invention also relates to a system diagram for optimizing the position of the damping patch of the automobile, which comprises the following modules:
the acquisition module 11 is used for defining and acquiring design input conditions for the project product;
the establishing module 21 is used for establishing a CAD model for the body-in-white according to the design input conditions;
the model processing module 31 is used for importing the data of the CAD model into a finite element preprocessor, and performing mesh division in the finite element preprocessor to establish a finite element model of the body in white;
a modal analysis module 41, configured to perform modal analysis on the finite element model to obtain a modal analysis result;
the modal testing module 42 is configured to perform a modal test on the body-in-white to obtain a modal test result;
a modal benchmarking module 51 for benchmarking the modal analysis result and the modal test result;
the judgment module 61 is used for optimizing the finite element model according to the calibration result, improving the simulation precision and controlling the modal frequency and the error of the vibration mode result to be less than 5%;
the damping analysis module 71 is used for performing equivalent radiation acoustic power analysis on the finite element model, distinguishing the maximum radiation position of the structural plate by combining a simulation result, preliminarily determining the position to which the damping fin should be applied, and also can be used for a modal comprehensive displacement method, overlapping all modal displacements of the white automobile body within the frequency range of 20-200Hz, wherein the overlapped modal displacements have a reference threshold value, so that damping arrangement is performed;
the topology optimization module 81 is configured to perform topology optimization on the peak frequency according to the analysis result of the Trimbody noise transfer function to obtain a topology optimization result, so as to preliminarily lock a position to which the damping fin should be applied;
the sensitivity analysis module 91 is used for carrying out sensitivity analysis on the primarily locked damping fin, finding a position with high sensitivity according to the sensitivity analysis result and carrying out primary arrangement design on the damping fin;
and the scheme verification module 100 is used for analyzing the Trimbody noise transfer function of the arranged damping fin and verifying the position and size of the scheme with obvious right ear response of the driver after the damping fin is added by combining the analysis result.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes in structure, shape and principle of the invention should be covered by the protection scope of the invention.
Claims (5)
1. A method for optimizing the position of an automobile damping patch is characterized by comprising the following steps:
s101, obtaining design input conditions through project product definition;
s102, establishing a CAD model for the body-in-white according to the design input conditions;
s103, establishing a finite element model of the body in white based on the CAD model;
s104, performing modal analysis on the finite element model to obtain a modal analysis result;
s105, carrying out modal test on the body-in-white to obtain a modal test result;
s106, performing benchmarking on the modal analysis result and the modal test result;
s107, optimizing the finite element model according to the benchmarking result, improving the simulation precision and controlling the modal frequency and the error of the vibration mode result to be less than 5%;
s108, performing equivalent radiation acoustic power analysis on the finite element model, distinguishing the maximum radiation position of the structural plate by combining a simulation result, and preliminarily determining the position to which the damping fin should be applied;
s109, based on a modal comprehensive displacement method, superposing all modal displacements of the white automobile body within the frequency range of 20-200Hz, wherein the superposed modal displacements have a reference threshold value, and performing damping arrangement;
s110, carrying out topology optimization on peak frequency according to the analysis result of the Trimbody noise transfer function, and thus preliminarily locking the position to which the damping fin should be applied;
s111, carrying out sensitivity analysis on the primarily locked damping fins, and finding out the position with high sensitivity according to the sensitivity analysis result to carry out primary layout design on the damping fins;
and S112, carrying out Trimbody noise transfer function analysis on the arranged damping fins, and carrying out position and size verification on the scheme which has obvious right ear response of the driver after the damping fins are added by combining the analysis result.
2. The method for optimizing the position of the automobile damping patch according to claim 1, wherein the method comprises the following steps: and S103, importing the data of the CAD model into a finite element preprocessor, and performing meshing in the finite element preprocessor to establish the finite element model of the body-in-white.
3. The method for optimizing the position of the automobile damping patch according to claim 1, wherein the method comprises the following steps: and S105, performing modal test on the body-in-white by adopting a vibration exciter excitation method, and performing modal frequency extraction on each point response data to obtain modal frequency data, modal damping ratio and vibration mode data of the body-in-white.
4. The method for optimizing the position of the automobile damping patch according to claim 1, wherein the method comprises the following steps: and S108, performing equivalent radiated acoustic power analysis on the finite element model, respectively applying unit forces in three directions to key attachment points of a vehicle body and a chassis, wherein the excitation frequency range is 50-500Hz, and calculating to obtain an equivalent radiated acoustic power analysis result.
5. An automobile damping patch position optimization system based on any one of claims 1-4, characterized by comprising:
the acquisition module is used for defining and acquiring design input conditions for the project product;
the building module is used for building a CAD model for the body-in-white according to the design input conditions;
the model processing module is used for establishing a finite element model of the body in white based on the CAD model;
the modal analysis module is used for carrying out modal analysis on the finite element model to obtain a modal analysis result;
the modal testing module is used for carrying out modal testing on the body-in-white to obtain a modal testing result;
the modal benchmarking module is used for benchmarking the modal analysis result and the modal test result;
the judgment module is used for optimizing the finite element model according to the benchmarking result, improving the simulation precision and controlling the modal frequency and the vibration mode result error to be less than 5%;
the damping analysis module is used for carrying out equivalent radiation acoustic power analysis on the finite element model, distinguishing the maximum radiation position of the structural plate by combining a simulation result, preliminarily determining the position to which the damping fin should be applied, and can also be used for a modal comprehensive displacement method, superposing all modal displacements of the white automobile body within the frequency range of 20-200Hz, wherein the superposed modal displacements have a reference threshold value, and carrying out damping arrangement;
the topology optimization module is used for carrying out topology optimization on the peak frequency according to the analysis result of the Trimbody noise transfer function, so that the position where the damping fin should be applied is locked preliminarily;
the sensitivity analysis module is used for carrying out sensitivity analysis on the primarily locked damping fin and finding out a position with high sensitivity according to the sensitivity analysis result to carry out primary arrangement design on the damping fin;
and the scheme verification module is used for carrying out Trimbody noise transfer function analysis on the arranged damping fin and verifying the position and size of the scheme with obvious right ear response of the driver after the damping fin is added by combining the analysis result.
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Cited By (1)
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