CN106503361B - A kind of engine plastic items Low Noise Design method - Google Patents
A kind of engine plastic items Low Noise Design method Download PDFInfo
- Publication number
- CN106503361B CN106503361B CN201610949479.2A CN201610949479A CN106503361B CN 106503361 B CN106503361 B CN 106503361B CN 201610949479 A CN201610949479 A CN 201610949479A CN 106503361 B CN106503361 B CN 106503361B
- Authority
- CN
- China
- Prior art keywords
- plastic items
- noise
- frequency
- result
- radiated noise
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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]
Abstract
The present invention relates to a kind of engine plastic items Low Noise Design methods, comprising: establishes injection model, for gate location in centre, fiber flow direction is from left to right, to obtain along the different test sample of machine direction and two, vertical fibers direction；Tension test test is carried out to the test sample established from different directions, obtains the elasticity modulus of machine direction and vertical fibers direction respectively.Construct anisotropic material elastic constitutive model equation；The surface vibration response result of plastic items is mapped in acoustic envelope grid, the calculating of acoustic boundary member is carried out, obtains the radiated noise size of plastic items；It is found out and the immediate mode order of crest frequency according to radiated noise interpretation of result noise peak frequency by calculating the Constrained mode of plastic items, as optimization aim, structure is changed to improve the modal frequency of the mode order, avoids resonant frequency, reduces radiated noise.
Description
Technical field
The present invention relates to a kind of engine plastic items Low Noise Design methods.
Background technique
Engine plastic items in engine noise reduction due to playing important work with excellent damping characteristic
With engine plastic items mostly use fibre reinforced plastics, it is ensured that plastic items have enough intensity, and fiber increases
The mechanical property of strong plastics is different with the change of fiber orientation and planform, therefore, based on isotropic material model with
Anisotropic material model can obtain different as a result, and having certain difference in statics Analysis and calculation of dynamic response
Different, this means that the calculated result based on isotropic material model will lead to apparent error, especially for some faces
The biggish thin plate type component of product, resultant error can be bigger, cannot not only obtain correct components results of performance analysis in this way,
It can mislead instead to subsequent optimization design, it is therefore proposed that a kind of engine plastic items Low Noise Design method pair
The Low Noise Design of engine is of great significance.
Summary of the invention
In view of the above-mentioned problems, it is an object of the invention to provide a kind of engine plastics zero that prediction model accuracy can be improved
Component Low Noise Design method, technical scheme is as follows:
A kind of engine plastic items Low Noise Design method, including the following steps:
(1) injection model is established, for gate location in centre, fiber flow direction is from left to right, to obtain along fibre
Tie up direction and the different test sample in two, vertical fibers direction；Stretching examination is carried out to the test sample established from different directions
Test examination, obtains the elastic modulus E of machine direction and vertical fibers direction respectively1And E2。
(2) according to the elastic modulus E of machine direction and vertical fibers direction1And E22, Poisson's ratio value takes with isotropism
It is worth identical, building anisotropic material elastic constitutive model equation, the definition of progress anisotropic material attribute in finite element software:
Wherein,Stiffness matrix [D]mIn constant by calculate flexibility matrix [C]mInverse matrix
It obtains；
(3) flow direction of fiber and final fiber orientation, plastics in plastic items are obtained by mold flow analysis
Components different parts fiber orientations is different, thus to plastic items different parts by way of defining local coordinate system come
Machine direction is defined, realizes that the material of fibre reinforced plastics components different parts is fixed in conjunction with above-mentioned anisotropic material attribute
Justice.
(4) by pasting vibration acceleration sensor in plastic items and the engine body place of being bolted, plastics are obtained
The vibrational excitation of components, by applying vibrational excitation at plastic items bolt hole, to calculate the vibration of plastic items
Response results；
(5) the surface vibration response result of plastic items is mapped in acoustic envelope grid, carries out acoustic boundary member
It calculates, obtains the radiated noise size of plastic items；
(6) it is found out according to radiated noise interpretation of result noise peak frequency by calculating the Constrained mode of plastic items
Structure is changed to improve the modal frequency of the mode order, is kept away as optimization aim with the immediate mode order of crest frequency
Resonant frequency is opened, radiated noise is reduced.
The present invention obtains the elasticity modulus of machine direction and vertical fibers direction by material tensile test, constructs each to different
Property elastic properties of materials constitutive equation, define machine direction by local coordinate system, realize the definition of anisotropic material attribute, mention
The accuracy of high prediction model.
Detailed description of the invention
Injection model shown in FIG. 1
The finite element model of Fig. 2 different materials attribute
Fig. 3 oil cooler the cover noise prediction as a result, (a) be isotropism, (b) be anisotropy
Plastics cooler for engine oil cover noise after Fig. 4 optimization
Specific embodiment
The present invention will be described with reference to the accompanying drawings and examples.The specific steps of the present invention are as follows:
(1) it in order to obtain along the different test sample of machine direction and two, vertical fibers direction, can establish such as Fig. 1 institute
The injection model shown, the gate location of injection model can make fiber orientation more consistent in this way in centre, in big dotted line frame
The consistent material exemplar of fiber orientation can be obtained, fiber flow direction is that from left to right, therefore can obtain as can be seen from Figure
Obtain machine direction exemplar and vertical direction exemplar.Tension test test is carried out to the exemplar of different directions, obtains fiber side respectively
To the elastic modulus E with vertical fibers direction1And E2。
(2) according to elastic modulus E1And E2, Poisson's ratio μ12And μ23Value is identical as isotropic material value, construct it is each to
Unlike material elastic constitutive model equation carries out the definition of anisotropic material attribute in finite element software.
Wherein,Stiffness matrix [D]mIn constant can by calculate it is soft
It spends matrix [C]mInverse matrix obtain.
(3) using software MOLDFLOW by the flow direction of fiber in the available plastic items of mold flow analysis and
Final fiber orientation, plastic items different parts fiber orientation is different, therefore to plastic items different parts by determining
The mode of adopted local coordinate system defines machine direction, in conjunction with above-mentioned anisotropic material attribute can realize fibre reinforced plastics zero
The material of component different parts defines.
(4) it by pasting vibration acceleration sensor in plastic items and the engine body place of being bolted, can obtain
The vibrational excitation of plastic items, by applying vibrational excitation at plastic items bolt hole, to calculate plastic items
Vibratory response result.
(5) the surface vibration response result of plastic items is mapped in acoustic envelope grid, carries out acoustic boundary member
It calculates, can get the radiated noise size of plastic items.
(6) it is found out according to radiated noise interpretation of result noise peak frequency by calculating the Constrained mode of plastic items
It is improved as optimization aim by structural optimization software or manual change structure with the immediate mode order of crest frequency
The order modal frequency avoids resonant frequency, reduces radiated noise.
Embodiment:
It altogether include 52 according to the fiber orientation of plastics machine oil cooling dome lid as a result, finite element model can be divided into 12 groups
Piecemeal, as shown in Figure 2；Different piecemeals fiber orientation having the same and identical color in same group, utilize local coordinate
The fiber orientation of different piecemeals is defined in system, in simulation calculation, the bolt hole position of plastics oil cooler the cover
Constrain six-freedom degree.
In order to compare the difference of isotropic material model and anisotropic material model in terms of characteristics of mode, to two kinds
The plastics oil cooler the cover of model carries out Free Modal simulation analysis respectively；It is proposed in this paper based on each to different in order to verify
The accuracy of property material property modeling and simulation method, has carried out modal test test to plastics oil cooler the cover；
The calculating Free Modal frequency and experimental modal frequency Comparative result of isotropism and anisotropic material model, such as
Shown in table 1,
1 plastics oil cooler cover mold state frequency comparison of table
Referring to Fig. 3, it can be found that the sound function of anisotropic material model from the noise prediction result of two kinds of material models
There is some difference with isotropic material model result for rate result, and in 500Hz to 1000Hz range intervals, anisotropy material
Expect that plant noise result is significantly lower than isotropic material plant noise as a result, by calculating it can be found that each in this frequency band
The overall noise of anisotropy material model is lower than isotropic material model 2.05dB.
The radiated noise result of radiated noise result and original plastic oil cooler the cover after structure optimization is carried out
Comparison, it can be found that radiated noise result decreases after optimization, by calculating the plastics oil cooler cover it is found that after optimization
Lid radiated noise total acoustic power grade is 93.97dB, 4.18dB lower than the radiated noise total acoustic power grade of initial model.
Claims (1)
1. a kind of engine plastic items Low Noise Design method, including the following steps:
(1) injection model is established, for gate location in centre, fiber flow direction is from left to right, to obtain along fiber side
To the test sample different with two, vertical fibers direction；Tension test survey is carried out to the test sample established from different directions
Examination obtains the elastic modulus E of machine direction and vertical fibers direction respectively1And E2；
(2) according to the elastic modulus E of machine direction and vertical fibers direction1And E2, Poisson's ratio μ12And μ23With isotropism value
It is identical, anisotropic material elastic constitutive model equation is constructed, the definition of anisotropic material attribute is carried out in finite element software:
Wherein,Stiffness matrix [D]mIn constant by calculate flexibility matrix [C]mInverse matrix obtain；
(3) flow direction of fiber and final fiber orientation in plastic items are obtained by mold flow analysis, zero, plastics
Part different parts fiber orientation is different, therefore is defined by way of defining local coordinate system to plastic items different parts
Machine direction realizes the material definition of fibre reinforced plastics components different parts in conjunction with above-mentioned anisotropic material attribute；
(4) by pasting vibration acceleration sensor in plastic items and the engine body place of being bolted, zero, plastics is obtained
The vibrational excitation of part, by applying vibrational excitation at plastic items bolt hole, to calculate the vibratory response of plastic items
As a result；
(5) the surface vibration response result of plastic items is mapped in acoustic envelope grid, carries out the calculating of acoustic boundary member,
Obtain the radiated noise size of plastic items；
(6) it according to radiated noise interpretation of result noise peak frequency, by calculating the Constrained mode of plastic items, finds out and peak
It is worth the immediate mode order of frequency, as optimization aim, changes structure to improve the modal frequency of the mode order, avoid altogether
Vibration frequency reduces radiated noise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610949479.2A CN106503361B (en) | 2016-10-26 | 2016-10-26 | A kind of engine plastic items Low Noise Design method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610949479.2A CN106503361B (en) | 2016-10-26 | 2016-10-26 | A kind of engine plastic items Low Noise Design method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106503361A CN106503361A (en) | 2017-03-15 |
| CN106503361B true CN106503361B (en) | 2019-02-26 |
Family
ID=58323037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610949479.2A Active CN106503361B (en) | 2016-10-26 | 2016-10-26 | A kind of engine plastic items Low Noise Design method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106503361B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102023074A (en) * | 2010-11-10 | 2011-04-20 | 中国第一汽车集团公司 | Performance analysis method for vibratory noise of automobile engine oil pan |
| CN104834763A (en) * | 2014-10-31 | 2015-08-12 | 北汽福田汽车股份有限公司 | Method for obtaining engine radiation noise and engine design optimization method |
| CN105512409A (en) * | 2015-12-11 | 2016-04-20 | 中国北方发动机研究所(天津) | Optimum design method of engine parts |
-
2016
- 2016-10-26 CN CN201610949479.2A patent/CN106503361B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102023074A (en) * | 2010-11-10 | 2011-04-20 | 中国第一汽车集团公司 | Performance analysis method for vibratory noise of automobile engine oil pan |
| CN104834763A (en) * | 2014-10-31 | 2015-08-12 | 北汽福田汽车股份有限公司 | Method for obtaining engine radiation noise and engine design optimization method |
| CN105512409A (en) * | 2015-12-11 | 2016-04-20 | 中国北方发动机研究所(天津) | Optimum design method of engine parts |
Non-Patent Citations (2)
| Title |
|---|
| Performance analysis of the plastic square plate based on the fiber reinforced PA66;Jian Wang等;《2016 3rd International Conference on Mechanics and Mechatronics Research (ICMMR 2016)》;20161003;08003 |
| 基于流固体耦合和模态参与因子的低噪声油底壳优化设计研究;张俊红等;《内燃机工程》;20160630;第105-110页 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106503361A (en) | 2017-03-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| El Mahi et al. | Damping analysis of orthotropic composite materials and laminates | |
| Kim et al. | Identification of fractional-derivative-model parameters of viscoelastic materials from measured FRFs | |
| Houmat | Nonlinear free vibration of laminated composite rectangular plates with curvilinear fibers | |
| Daoud et al. | Numerical and experimental characterization of the dynamic properties of flax fiber reinforced composites | |
| CN109362020A (en) | A kind of Numerical Simulation Analysis method of speaker frame dynamic stiffness | |
| Yang et al. | Simulations on the wide bandgap characteristics of a two-dimensional tapered scatterer phononic crystal slab at low frequency | |
| CN108846192A (en) | A kind of ship three dimensional sound flexibility analysis method of any impedance bundary of structure | |
| Lasov et al. | Investigation of dynamic properties of hybrid laminate structure | |
| Hine et al. | Validating a micromechanical modelling scheme for predicting the five independent viscoelastic constants of unidirectional carbon fibre composites | |
| CN106503361B (en) | A kind of engine plastic items Low Noise Design method | |
| Singh et al. | Vibroacoustic response of mode localized thin functionally graded plates using physical neutral surface | |
| Moradi Dastjerdi et al. | Static and free vibration analyses of functionally graded nano-composite plates reinforced by wavy carbon nanotubes resting on a Pasternak elastic foundation | |
| Quanjin et al. | Numerical investigation on free vibration analysis of kevlar/glass/epoxy resin hybrid composite laminates | |
| Kamal et al. | Vibration damping behavior of fiber reinforced composites: A review | |
| Urban et al. | Macroscopic Modeling of the Linear Viscoelastic Vibration Behavior of Short Fiber Reinforced Plastics | |
| Jaber et al. | Vibrational energy flow in carbon composite structures | |
| Kherredine et al. | Evaluation and measurement of the damping properties of laminated CFRP composite plates | |
| KR100661307B1 (en) | Dynamic simulation method on hydraulic mount | |
| Meng et al. | Research on the multilayer free damping structure design | |
| Wang et al. | The relationship between structural intensity and sound field characteristics of cylindrical shells | |
| Domingo-Roca | 3D-Printing technology applied to the development of bio-inspired functional acoustic systems | |
| CN112257213B (en) | Method for describing large-deflection vibration of rubber cylindrical shell | |
| Elwali et al. | Vibro-acoustic computation of irregular cavities using a combined analytical-finite element approach with application to vehicle interior acoustics | |
| Pluymers et al. | Application of the wave based prediction technique for the analysis of the coupled vibro-acoustic behaviour of a 3D cavity | |
| Zha et al. | An improved Fourier series method for rectangular structural-acoustic coupling system with arbitrary boundary conditions |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |