CN109753722A - A kind of optimum design method and system improving noise transfer function - Google Patents
A kind of optimum design method and system improving noise transfer function Download PDFInfo
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Abstract
The present invention provides a kind of optimum design methods and system for improving noise transfer function, comprising: establishes the finite element model for reorganizing and outfit vehicle body and crew module's operatic tunes of vehicle to be optimized；Noise transfer function analysis is carried out to finite element model, obtains the sound pressure level curve of noise transfer function；The sheet metal component being coupled in finite element model with crew module's operatic tunes is subjected to panel division, obtains multiple panels；Panel contribution amount and the analysis of modal contribution amount are carried out based on the peak value in sound pressure level curve, determines the target board and target modalities for causing transmission function peak value；Body structure is optimized based on target modalities and target board, the object construction after being optimized, and vehicle body finite element model is modified based on the object construction after optimization.By the present invention in that with analysis software, at automobile research initial stage, so that it may which the body structure for the noise transfer function for reorganizing and outfit vehicle body to influence on finite element model optimizes, and improves body performance, has saved research and development cost, shortened the R&D cycle.
Description
Technical field
The present invention relates to Automobile Body Design technical fields, set more particularly, to a kind of optimization for improving noise transfer function
Count method and system.
Background technique
Noise transfer function (Noise Transfer Function, abbreviation NTF) be primarily referred to as input stimulus load with it is defeated
Respective function relationship between noise out is to influence vehicle noise, vibration for evaluation structure to the sensory characteristic of vibration sounding
The dynamic principal element with sound vibration roughness (Noise, Vibration, Harshness, abbreviation NVH) performance.Whether from road
The excitation in face or the excitation of engine are all finally that occupant is passed to by vehicle body, and therefore, the structure of vehicle body is to noise
It transmits most important.
Noise transfer function analysis is will to reorganize and outfit vehicle body and crew module's operatic tunes as coupled system, analyzes vehicle body attachment point and adds
It carries unit and motivates the acoustic response generated at human ear in the car.Noise transfer function reflects body structure vibration to internal car noise
Influence degree, vehicle body interior noise level can be controlled effectively to the control of body noise transmission function.The NVH of the prior art is tried
Although test examination is a kind of method of reliable analysis noise function, NVH test is carried out to vehicle by research technique
R & D Cost is high and the period is longer.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of optimum design method for improving noise transfer function and being
System tests by research technique the NVH that vehicle carries out the side to optimize to body panels compared to the prior art
Formula, the method that the present invention optimizes body panels by the analysis to finite element model, shortens body of a motor car
Development cycle reduces R & D Cost.
In a first aspect, the embodiment of the invention provides a kind of optimum design method for improving noise transfer function, the side
Method includes: to establish the geometrical model for reorganizing and outfit vehicle body of vehicle to be optimized, based on the geometrical model establish described in reorganize and outfit vehicle body
Finite element model obtains the first finite element model；The finite element mould of crew module's operatic tunes is established based on first finite element model
Type obtains the second finite element model；Noise is carried out to first finite element model and second finite element model and transmits letter
Number analysis, obtains the sound pressure level curve of noise transfer function；By in first finite element model with crew module's operatic tunes phase
The sheet metal component of coupling carries out panel division, obtains multiple panels；Based on the peak value in the sound pressure level curve to the multiple face
Plate carries out panel contribution amount and the analysis of modal contribution amount, determines the target board and mesh for causing the peak value in the sound pressure level curve
Mark mode；The body structure of the vehicle to be optimized is optimized based on the target board and the target modalities, is obtained
Target body structure after optimization, and first finite element model and institute are modified based on the target body structure after the optimization
The second finite element model is stated, the first finite element model after being optimized and the second finite element model after optimization.
Further, the method also includes: according to after the optimization the first finite element model and the optimization after
Second finite element model carries out noise transfer function analysis again, the sound pressure level curve of the noise transfer function after being optimized；
Whether the sound pressure level peak of curve of the noise transfer function after judging the optimization is less than or equal to predetermined target value；If so,
Then terminate to optimize.
Further, the method also includes: if it is determined that the sound pressure level curve of the noise transfer function after the optimization
Peak value is greater than predetermined target value, then the target board and the target modalities is again based on, to the vehicle of the vehicle to be optimized
Body structure optimizes, the target body structure after obtaining suboptimization again, and based on the target vehicle body knot after the suboptimization again
Structure modifies first finite element model and second finite element model, the first finite element model after obtaining suboptimization again and
The second finite element model after suboptimization again.
Further, noise transfer function point is carried out to first finite element model and second finite element model
Analysis, the sound pressure level curve for obtaining the noise transfer function includes: the selection vehicle body attachment point in first finite element model
As excitation point, the two ear positions of driver and occupant point in response is chosen in second finite element model；To described
The unit force of excitation point load different directions is motivated, and obtains the sound pressure level curve of the response point, as noise transmits letter
Several sound pressure level curves.
Further, the body structure of the vehicle to be optimized is carried out based on the target board and the target modalities
Optimization, comprising: the target body structure of vehicle to be optimized is determined based on the target board and the target modalities；If the mesh
The frequency for marking mode is higher than frequency corresponding to the peak value of the sound pressure level curve, and the frequency of the target modalities and the acoustic pressure
Difference between frequency corresponding to the peak value of grade curve is greater than preset value, then just using the part of the increase target body structure
The method of local quality spent or reduce the target body structure optimizes, the target body structure after being optimized；If
Frequency corresponding to peak value of the frequency of the target modalities lower than the sound pressure level curve, and the frequency of the target modalities and institute
The difference stated between frequency corresponding to the peak value of sound pressure level curve is greater than the preset value, then using the reduction target vehicle body knot
The method of the local quality of the local stiffness or increase target body structure of structure optimizes, the target carriage after being optimized
Body structure；If the difference between frequency corresponding to the peak value of the frequency of the target modalities and the sound pressure level curve is less than or waits
In the preset value, then optimized using the reduction target body structure vibration amplitude method, the target after being optimized
Body structure, wherein the reduction target body structure vibration amplitude method includes at least one of: increasing damping
Piece increases bump leveller.
Second aspect, the embodiment of the invention also provides a kind of Optimum Design System for improving noise transfer function, applications
In terminal device, the system comprises: the first model building module, for establishing the geometry mould for reorganizing and outfit vehicle body of vehicle to be optimized
Type；Second model building module, for obtaining first based on the finite element model for reorganizing and outfit vehicle body described in geometrical model foundation
Finite element model；The finite element model that crew module's operatic tunes is established based on first finite element model obtains the second finite element mould
Type；Noise transfer function analysis module, for carrying out noise to first finite element model and second finite element model
Transfer function analysis obtains the sound pressure level curve of noise transfer function；Panel division module is used for the first finite element mould
The sheet metal component being coupled in type with crew module's operatic tunes carries out panel division, obtains multiple panels；Contribution amount analysis module is used
In carrying out panel contribution amount and the analysis of modal contribution amount to the multiple panel based on the peak value in the sound pressure level curve, determine
Cause the target board and target modalities of the peak value in the sound pressure level curve；Structure optimization module, for being based on the target
Panel and the target modalities optimize the body structure of the vehicle to be optimized, the object construction after being optimized；Mould
Type update module, for modifying first finite element model and second finite element based on the object construction after the optimization
Model, the second finite element model after the first finite element model and optimization after being optimized.
Further, the structure optimization module comprises determining that unit, for being based on the target board and the target
Mode determines the target body structure of vehicle to be optimized；Target modalities frequency cells are improved, for using the increase target carriage
Vehicle body of the method for the local quality of the local stiffness or reduction target body structure of body structure to the vehicle to be optimized
Structure optimizes, the target body structure after being optimized；Target modalities frequency cells are reduced, for using the reduction mesh
It marks the local stiffness of body structure or increases the method for the local quality of the target body structure to the vehicle to be optimized
Body structure optimizes, the target body structure after being optimized；Reduce vibration amplitude unit, for using the reduction mesh
Mark body structure vibration amplitude method optimizes the body structure of the vehicle to be optimized, the target vehicle body after being optimized
Structure, wherein the reduction vibration amplitude method includes at least one of: increase damping fin, increase bump leveller.
Further, the system also includes: comparison module is used for: according to the first finite element model after the optimization
Noise transfer function analysis is carried out again with the second finite element model after the optimization, the noise transfer function after being optimized
Sound pressure level curve；It is preset whether the sound pressure level peak of curve of the noise transfer function after comparing the optimization is less than or equal to
Target value；If it is, terminating optimization.
The third aspect, the embodiment of the invention also provides a kind of electronic equipment, including memory, processor, the storages
The computer program that can be run on the processor is stored in device, wherein the processor executes the computer program
The step of Shi Shixian method as described in relation to the first aspect.
Fourth aspect, the embodiment of the invention also provides a kind of non-volatile program codes that can be performed with processor
Computer-readable medium, wherein said program code makes the method for the processor execution as described in relation to the first aspect.
The embodiment of the present invention brings following the utility model has the advantages that a kind of optimization design side for improving noise transfer function of the invention
Method and system.In the method, the geometrical model to be optimized for reorganizing and outfit vehicle body is initially set up；Geometrical model foundation is then based on to reorganize and outfit
The finite element model of vehicle body obtains the first finite element model；The finite element of crew module's operatic tunes is established based on the first finite element model
Model obtains the second finite element model；Noise transfer function analysis is carried out to a finite element model and the second finite element model again,
Obtain noise transfer function curve；The sheet metal component being coupled in first finite element model with crew module's operatic tunes carries out panel division,
Obtain multiple panels；Panel contribution amount and the analysis of modal contribution amount are carried out to the peak value of noise transfer function curve, influenced
The target board and target modalities of peak value；Target board and target modalities are finally based on, not to influence noise transfer function curve
The body structure of peak value optimizes respectively under same frequency, and updates the first finite element model and the second finite element model.The party
Method is by using analysis software, at automobile research initial stage, so that it may which the noise for reorganizing and outfit vehicle body to influence on finite element model passes
The body structure of delivery function optimizes, and improves body performance, has saved research and development cost, has shortened the R&D cycle.
Other features and advantages of the present invention will illustrate in the following description, also, partly become from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention are in specification, claims
And specifically noted structure is achieved and obtained in attached drawing.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of flow chart of optimum design method for improving noise transfer function provided in an embodiment of the present invention；
Fig. 2 is that a kind of automobile provided in an embodiment of the present invention reorganizes and outfit vehicle body finite element model figure；
Fig. 3 is a kind of operatic tunes finite element model figure of automobile provided in an embodiment of the present invention；
Fig. 4 is that a kind of major body attachment point mark of vehicle body finite element model of automobile provided in an embodiment of the present invention shows
It is intended to；
Fig. 5 is that a certain attachment point of vehicle body provided in an embodiment of the present invention is passed by the noise before and after target board topography optimization
Delivery function curve comparison figure；
Fig. 6 is the flow chart of another optimum design method for improving noise transfer function provided in an embodiment of the present invention；
Fig. 7 is a kind of structural representation of Optimum Design System for improving noise transfer function provided in an embodiment of the present invention
Figure；
Fig. 8 is the structural representation of another Optimum Design System for improving noise transfer function provided in an embodiment of the present invention
Figure.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In addition, in the description of the embodiment of the present invention unless specifically defined or limited otherwise, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Currently, vehicle NVH performance is to evaluate the important indicator of vehicle class, in body structure design, noise transmits letter
The direct reaction structure of number is the principal element for influencing vehicle NVH performance to the sensory characteristic of vibration sounding.Vehicle body and chassis,
The attachment point of power assembly is the key point for influencing body vibrations noise.Excitation or engine whether from road surface
Excitation, is all finally to pass to occupant by vehicle body.Although existing NVH experimental test is a kind of essential reliable side
Method, but and period longer problem high there are R & D Cost.Based on this, a kind of raising noise biography provided in an embodiment of the present invention
The optimization method and system of delivery function can be applied to the optimization that vehicle body noise transfer function is reorganized and outfit to automobile.
To transmit letter to a kind of raising noise disclosed in the embodiment of the present invention first convenient for understanding the present embodiment
Several optimization methods describe in detail.
Embodiment one:
The present invention provides kind of an optimization methods for raising noise transfer function, are applied to terminal device.It should be noted that
Step shown in the flowchart of the accompanying drawings can execute in a computer system such as a set of computer executable instructions, and
It, in some cases, can be to be different from sequence execution institute herein and although logical order is shown in flow charts
The step of showing or describing.As shown in Figure 1, method includes the following steps:
Step S102 establishes the geometrical model for reorganizing and outfit vehicle body of vehicle to be optimized.
Geometrical model is established to the vehicle body of reorganizing and outfit of vehicle to be optimized first, for example, can be in CAD
The CAD model that automobile reorganizes and outfit vehicle body is established in (Computer Aided Design) abbreviation CAD software.Wherein, vehicle is reorganized and outfit
Vehicle body refers to automobile by the vehicle body of factory specification equipment complete (such as spare tyre, tool installation is complete).
Step S104 is established the finite element model for reorganizing and outfit vehicle body based on geometrical model, obtains the first finite element model；It is based on
First finite element model establishes the finite element model of crew module's operatic tunes, obtains the second finite element model.
The geometrical model for reorganizing and outfit vehicle body that step S102 is established imports computer-aided engineering (Computer Aided
Engineering) the pre-processing module of abbreviation CAE software carries out grid to the geometrical model for reorganizing and outfit vehicle body of vehicle to be optimized
It divides, is assembled after assigning material properties, establish spot welding, CO2Protect weldering, gluing, bolt, buckle, sealing strip, buffer stopper etc.
Type of attachment completes the foundation for reorganizing and outfit the finite element model of vehicle body, obtains the first finite element model.For example, establishing vehicle to be optimized
The first finite element model it is as shown in Figure 2.
The surface parameter inside the crew module in the first finite element model with air contacting surface is extracted, and is joined based on surface
Number obtains closed acoustic cavity；Crew module's operatic tunes finite element model is established based on closed acoustic cavity, and assigns material category
Property information, obtains the second finite element model.For example, the second finite element model for establishing vehicle to be optimized is as shown in Figure 3.
Step S106, to the first finite element model and the second finite element model vehicle to be optimized the main attachment point of vehicle body
Noise transfer function analysis is carried out, the sound pressure level curve of noise transfer function is obtained.
Fig. 4 is that a kind of major body attachment point mark of vehicle body finite element model of automobile provided in an embodiment of the present invention shows
It is intended to.
Specifically, vehicle body attachment point is chosen in the first finite element model as excitation point, in the second finite element model
Choose the two ear positions of driver and occupant point in response；
The unit force of excitation point load different directions is motivated, the sound pressure level curve of response point, as noise are obtained
The sound pressure level curve of transmission function.
For example, loading unit force respectively (for example, can be using 10~200Hz's to tri- directions vehicle body attachment point X, Y, Z
Broadband white noise) it is motivated, obtain the sound pressure level curve of response point, i.e. the sound pressure level curve of noise transfer function.
The sheet metal component being coupled in first finite element model with crew module's operatic tunes is carried out panel division, obtained by step S108
To multiple panels.
Specifically, the sheet metal component coupled in the first finite element model with crew module's operatic tunes is subjected to panel division, wherein face
Plate division principle can be with are as follows:
A. panel is uniform in size；B. symmetrical about Y-axis；C. there is directive property.
Step S110 carries out panel contribution amount and modal contribution amount point to multiple panels based on the peak value in sound pressure level curve
Analysis determines the target board and target modalities for causing the peak value in sound pressure level curve.
Specifically, to the peak value of the sound pressure level curve of different noise transfer functions, panel contribution amount and modal contribution are carried out
Amount analysis, finds out the primary panel and primary modal for influencing peak value, observes Mode Shape, further determines that peak value producing cause,
The target board and target modalities for causing the peak value in sound pressure level curve are determined, so as to the determination of subsequent prioritization scheme.
Step S112 is based on target board and target modalities, bent on the sound pressure level for influencing noise biography letter in vehicle to be optimized
The body structure of peak value optimizes respectively under line different frequency, the target body structure after being optimized, and is based on after optimizing
Target body structure modify the first finite element model and the second finite element model, the first finite element model after optimize with
The second finite element model after optimization.To update finite element model.For example, Fig. 5 be it is provided in an embodiment of the present invention it is a kind of to
The a certain attachment point of vehicle body for optimizing vehicle, by the sound pressure level curve pair of the noise transfer function before and after target board topography optimization
Than figure, it can be seen from the figure that the vehicle finite element model after optimum design method provided in an embodiment of the present invention optimization
Noise transfer function sound pressure level curve, in frequency peak value corresponding between 112Hz~135Hz, before optimization
The sound pressure level curve of the noise transfer function of vehicle finite element model, in frequency peak value corresponding between 112Hz~135Hz
Want low.
A kind of optimum design method improving noise transfer function provided in an embodiment of the present invention, initially sets up to be optimized whole
The geometrical model of standby vehicle body；It is then based on geometrical model and establishes the finite element model for reorganizing and outfit vehicle body, obtain the first finite element model；
The finite element model that crew module's operatic tunes is established based on the first finite element model obtains the second finite element model；Again to a finite element
Model and the second finite element model carry out noise transfer function analysis, obtain noise transfer function curve；First finite element model
In the sheet metal component that is coupled with crew module's operatic tunes carry out panel division, obtain multiple panels；To the peak of noise transfer function curve
Value carries out panel contribution amount and the analysis of modal contribution amount, obtains the target board and target modalities for influencing peak value；Finally it is based on mesh
Panel and target modalities are marked, the body structure for influencing peak value under noise transfer function curve different frequency is optimized respectively,
And update the first finite element model and the second finite element model.This method is by using analysis software, at automobile research initial stage, just
The body structure for the noise transfer function that vehicle body can be reorganized and outfit to influence on finite element model optimizes, and improves vehicle body
Can, research and development cost has been saved, the R&D cycle is shortened.
Preferably, above-mentioned steps S112 is based on target board and target modalities, passes letter to noise is influenced in vehicle to be optimized
Sound pressure level curve different frequency under peak value the method that optimizes respectively of body structure are as follows: according to quality, rigidity, damping pair
The influence situation of noise transfer function, in conjunction with the target modalities frequency and peak of the sound pressure level peak of curve for causing noise transfer function
It is worth the comparative situation of frequency, and causes the target board and peripheral structure of the sound pressure level peak of curve of noise transfer function, really
Determine Body structure optimization method, specifically, includes the following steps:
Step S1121 determines the target body structure of vehicle to be optimized based on target board and target modalities.
Step S1122, if frequency corresponding to peak value of the frequency of target modalities higher than sound pressure level curve, and target modalities
Difference between frequency corresponding to the peak value of frequency and sound pressure level curve is greater than preset value, then using increase target body structure
The method of the local quality of local stiffness or reduction target body structure optimizes the body structure of vehicle to be optimized, thus
Achieve the effect that improve target modalities frequency values.Such as target board partial structurtes are changed by topography optimization, increase structure and connects
The methods of it connects, increase support construction, change thickness.Wherein, preset value can arbitrarily be set according to actual needs, do not do have here
Body limits.
For example, preset value is 1Hz, the frequencies of target modalities is 80Hz, corresponding to a peak value in sound pressure level curve
Frequency is 78Hz, then can improve target modalities frequency values using the method for the local stiffness for increasing target body structure, from
And the body structure of vehicle to be optimized is optimized.
Step S1123, if frequency corresponding to peak value of the frequency of target modalities lower than sound pressure level curve, and target modalities
Difference between frequency corresponding to the peak value of frequency and sound pressure level curve is greater than preset value, then using reduction target body structure
The method of the local quality of local stiffness or increase target board optimizes the body structure of vehicle to be optimized, to reach
Reduce the effect of target modalities frequency values.Such as mass damper is increased to the part of target body structure, weakens connection, change
The methods of thickness.
For example, preset value is 1Hz, the frequencies of target modalities is 76Hz, corresponding to a peak value in sound pressure level curve
Frequency is 78Hz, then can reduce target modalities frequency values using the method for the local stiffness for reducing target body structure, from
And the body structure of vehicle to be optimized is optimized.
Step S1124, if the difference between frequency corresponding to the peak value of the frequency of target modalities and sound pressure level curve is less than
Or be equal to preset value, then it is excellent to the body structure progress of vehicle to be optimized using target body structure vibration amplitude method is reduced
The methods of change, such as damping fin is increased to target body structure, increases bump leveller.
For example, preset value is 1Hz, the frequencies of target modalities is 78.5Hz, corresponding to a peak value in sound pressure level curve
Frequency be 78Hz, then can using to target body structure increase damping fin, reduce target body structure magnitude of vibrations side
Method optimizes the body structure of vehicle to be optimized.
Step S1125: finite element model is updated based on the sheet metal component after structure optimization, i.e., and based on the target knot after optimization
Structure modifies the first finite element model and the second finite element model, second after the first finite element model and optimization after being optimized
Finite element model.
Preferably, as shown in fig. 6, the optimum design method provided in an embodiment of the present invention for improving noise transfer function, goes back
It may include steps of:
Step S114 makes an uproar again according to the first finite element model after optimization and the second finite element model after optimization
Acoustic transfer function analysis, the sound pressure level curve of the noise transfer function after being optimized.
Specifically, the noise in the first finite element model and the second finite element model progress step S106 after optimization is passed
Delivery function analytic process, for example, in the first finite element model after optimization, to tri- directions difference of vehicle body attachment point X, Y, Z
Load unit force (for example, the broadband white noise that can use 10~200Hz) is motivated, the second finite element after output optimization
In model, sound pressure level curve at driver's auris dextra obtains the sound pressure level curve of response point, the i.e. acoustic pressure of noise transfer function
Grade curve.
Whether the sound pressure level peak of curve of step S116, the noise transfer function after judging optimization are less than or equal to default mesh
Scale value, if so, thening follow the steps S118；If it is not, then return step S112.
Specifically, if it is determined that the sound pressure level peak of curve of the noise transfer function after optimization is greater than predetermined target value, then
It is again based on target board and target modalities, the body structure of vehicle to be optimized is optimized, the mesh after obtaining suboptimization again
Structure is marked, and the first finite element model and the second finite element model are modified based on the object construction after suboptimization again, is obtained again
The first finite element model after optimization and again the second finite element model after suboptimization.
Step S118 terminates optimization.
Specifically, noise transfer function analysis is re-started to each vehicle body attachment point after optimization, after verifying optimization
Whether the peak value of vehicle body attachment point noise transfer function curve meets requirement of the vehicle to noise transfer function, i.e., after judgement optimization
The sound pressure level peak of curve of noise transfer function whether be less than or equal to predetermined target value.If it is, can terminate to optimize.
If it is not, then return step S112, re-starts Body structure optimization, until meeting the noise transfer function requirement of vehicle (no
With vehicle according to the difference of exploitation demand, usual noise transfer function sound pressure level different to the requirement condition of noise transfer function
Predetermined target value be 55dB).
If the peak value of the vehicle body attachment point noise transfer function curve after optimization meets vehicle to noise transfer function
It is required that can then terminate the Body structure optimization process.
It should be noted that automobile provided in an embodiment of the present invention reorganizes and outfit vehicle body noise transfer function optimization method, not only
Suitable for the optimization to the noise transfer function for reorganizing and outfit vehicle body, apply also for the modal Optimization for reorganizing and outfit vehicle body.
As can be seen from the above description, the embodiment of the invention provides a kind of optimization design sides for improving noise transfer function
Method, by using analysis software, for example, reorganizing and outfit having for vehicle body and the vehicle body operatic tunes using what CAD software and CAE software established vehicle
Meta-model is limited, and carries out the mode of noise transfer function analysis to the finite element model of foundation, obtains influencing body noise transmitting
The panel block of peak of function carries out topography optimization by opposite plate, and then optimizes to body panels design.It is opened in vehicle
Hair initial stage, so that it may which the body structure for the noise transfer function for reorganizing and outfit vehicle body to influence on finite element model optimizes, and mentions
High body performance, has saved research and development cost, has shortened the R&D cycle.
Embodiment two:
The embodiment of the invention also provides a kind of Optimum Design System for improving noise transfer function, which is mainly used for
The optimum design method that noise transfer function is improved provided by above content of the embodiment of the present invention is executed, below to of the invention real
The system for applying example offer does specific introduction.
Fig. 7 is a kind of structural representation of Optimum Design System for improving noise transfer function according to an embodiment of the present invention
Figure is applied to terminal device, as shown in fig. 7, the system specifically includes that the first model building module 10, the second model foundation mould
Block 20, noise transfer function analysis module, 30, panel division module 40, contribution amount analysis module 50,60 He of structure optimization module
Model modification module 70, wherein specifically, first model building module 10, for establishing the vehicle body of reorganizing and outfit of vehicle to be optimized
Geometrical model.
Second model building module 20 obtains first for establishing the finite element model for reorganizing and outfit vehicle body based on geometrical model
Finite element model；The finite element model that crew module's operatic tunes is established based on the first finite element model obtains the second finite element model.
Noise transfer function analysis module 30, for carrying out noise biography to the first finite element model and the second finite element model
Delivery function analysis, obtains the sound pressure level curve of noise transfer function.
Panel division module 40, the sheet metal component for will be coupled in the first finite element model with crew module's operatic tunes carry out face
Plate divides, and obtains multiple panels.
Contribution amount analysis module 50, for based on the peak value in sound pressure level curve to multiple panels carry out panel contribution amount and
The analysis of modal contribution amount, determines the target board and target modalities for causing the peak value in sound pressure level curve.
Structure optimization module 60, it is excellent for being carried out based on target board and target modalities to the body structure of vehicle to be optimized
Change, the target body structure after being optimized.
Model modification module 70, for being had based on target body structure modification the first finite element model and second after optimization
Meta-model is limited, the second finite element model after the first finite element model and optimization after being optimized.
Optionally, as shown in figure 8, structure optimization module 60 comprises determining that unit 61, target modalities frequency cells are improved
62, it reduces target modalities frequency cells 63 and reduces vibration amplitude unit 64, specifically:
Determination unit 61, for determining the target body structure of vehicle to be optimized based on target board and target modalities；
Target modalities frequency cells 62 are improved, for using the local stiffness or reduction target carriage for increasing target body structure
The method of the local quality of body structure optimizes the body structure of vehicle to be optimized, the target vehicle body knot after being optimized
Structure；
Target modalities frequency cells 63 are reduced, for using the local stiffness or increase target carriage for reducing target body structure
The method of the local quality of body structure optimizes the body structure of vehicle to be optimized, the target vehicle body knot after being optimized
Structure；
Reduce vibration amplitude unit 64, reduces target body structure vibration amplitude method to vehicle to be optimized for using
Body structure optimizes, the target body structure after being optimized, wherein reduce vibration amplitude method include it is following at least it
One: increasing damping fin, increase bump leveller.
Preferably, as shown in figure 8, the Optimum Design System provided in an embodiment of the present invention for improving noise transfer function, goes back
Including comparison module 80, it is used for:
Noise transmitting letter is carried out again according to the first finite element model after optimization and the second finite element model after optimization
Number analysis, the sound pressure level curve of the noise transfer function after being optimized；The sound pressure level of noise transfer function after comparing optimization
Whether peak of curve is less than or equal to preset target value；If it is, terminating optimization.
A kind of Optimum Design System improving noise transfer function provided in an embodiment of the present invention, mentions with above-described embodiment one
The optimum design method technical characteristic having the same of a kind of raising noise transfer function supplied, so also can solve identical skill
Art problem reaches identical technical effect.
Optionally, the embodiment of the present invention also provides a kind of electronic equipment, including memory, processor, in the memory
It is stored with the computer program that can be run on the processor, the processor is realized above-mentioned when executing the computer program
A kind of the step of optimum design method of raising noise transfer function described in embodiment one.
Optionally, the embodiment of the present invention also provides a kind of calculating of non-volatile program code that can be performed with processor
Machine readable medium, said program code make the processor execute a kind of a kind of raising noise transfer function of above-described embodiment
Optimum design method.
Unless specifically stated otherwise, the opposite step of the component and step that otherwise illustrate in these embodiments, digital table
It is not limit the scope of the invention up to formula and numerical value.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description
It with the specific work process of device, can refer to corresponding processes in the foregoing method embodiment, details are not described herein.
In all examples being illustrated and described herein, any occurrence should be construed as merely illustratively, without
It is as limitation, therefore, other examples of exemplary embodiment can have different values.
The flow chart and block diagram in the drawings show the system of multiple embodiments according to the present invention, method and computer journeys
The architecture, function and operation in the cards of sequence product.In this regard, each box in flowchart or block diagram can generation
A part of one module, section or code of table, a part of the module, section or code include one or more use
The executable instruction of the logic function as defined in realizing.It should also be noted that in some implementations as replacements, being marked in box
The function of note can also occur in a different order than that indicated in the drawings.For example, two continuous boxes can actually base
Originally it is performed in parallel, they can also be executed in the opposite order sometimes, and this depends on the function involved.It is also noted that
It is the combination of each box in block diagram and or flow chart and the box in block diagram and or flow chart, can uses and execute rule
The dedicated hardware based system of fixed function or movement is realized, or can use the group of specialized hardware and computer instruction
It closes to realize.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, it can be with
It realizes by another way.The apparatus embodiments described above are merely exemplary, for example, the division of the unit,
Only a kind of logical function partition, there may be another division manner in actual implementation, in another example, multiple units or components can
To combine or be desirably integrated into another system, or some features can be ignored or not executed.Another point, it is shown or beg for
The mutual coupling, direct-coupling or communication connection of opinion can be through some communication interfaces, device or unit it is indirect
Coupling or communication connection can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, server or network equipment etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention.
And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic or disk.
Finally, it should be noted that embodiment described above, only a specific embodiment of the invention, to illustrate the present invention
Technical solution, rather than its limitations, scope of protection of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, those skilled in the art should understand that: anyone skilled in the art
In the technical scope disclosed by the present invention, it can still modify to technical solution documented by previous embodiment or can be light
It is readily conceivable that variation or equivalent replacement of some of the technical features；And these modifications, variation or replacement, do not make
The essence of corresponding technical solution is detached from the spirit and scope of technical solution of the embodiment of the present invention, should all cover in protection of the invention
Within the scope of.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. a kind of optimum design method for improving noise transfer function, which is characterized in that the described method includes:
The geometrical model for reorganizing and outfit vehicle body for establishing vehicle to be optimized, based on the geometrical model establish described in reorganize and outfit the limited of vehicle body
Meta-model obtains the first finite element model；The finite element model that crew module's operatic tunes is established based on first finite element model, is obtained
To the second finite element model；
Noise transfer function analysis is carried out to first finite element model and second finite element model, obtains noise transmitting
The sound pressure level curve of function；
The sheet metal component being coupled in first finite element model with crew module's operatic tunes is subjected to panel division, is obtained multiple
Panel；
Panel contribution amount is carried out to the multiple panel based on the peak value in the sound pressure level curve and modal contribution amount is analyzed, really
Surely cause the target board and target modalities of the peak value in the sound pressure level curve；
The body structure of the vehicle to be optimized is optimized based on the target board and the target modalities, is optimized
Target body structure afterwards, and first finite element model and described the are modified based on the target body structure after the optimization
Two finite element models, the second finite element model after the first finite element model and optimization after being optimized.
2. the method according to claim 1, wherein the method also includes:
Noise biography is carried out again according to the first finite element model after the optimization and the second finite element model after the optimization
Delivery function analysis, the sound pressure level curve of the noise transfer function after being optimized；
Whether the sound pressure level peak of curve of the noise transfer function after judging the optimization is less than or equal to predetermined target value；
If it is, terminating optimization.
3. according to the method described in claim 2, it is characterized in that, the method also includes:
If it is determined that the sound pressure level peak of curve of the noise transfer function after the optimization is greater than predetermined target value, then it is again based on
The target board and the target modalities optimize the body structure of the vehicle to be optimized, after obtaining suboptimization again
Target body structure, and first finite element model and described is modified based on the target body structure after the suboptimization again
Second finite element model, the first finite element model after obtaining suboptimization again and again the second finite element model after suboptimization.
4. the method according to claim 1, wherein to first finite element model and second finite element
Model carries out noise transfer function analysis, and the sound pressure level curve for obtaining the noise transfer function includes:
Vehicle body attachment point is chosen in first finite element model as excitation point, is chosen in second finite element model
The two ear positions of driver and occupant point in response；
The unit force of the excitation point load different directions is motivated, obtains the sound pressure level curve of the response point, as
The sound pressure level curve of noise transfer function.
5. the method according to claim 1, wherein based on the target board and the target modalities to described
The body structure of vehicle to be optimized optimizes, and the target body structure after being optimized includes:
The target body structure of vehicle to be optimized is determined based on the target board and the target modalities；
If the frequency of the target modalities is higher than frequency corresponding to the peak value of the sound pressure level curve, and the frequency of the target modalities
Difference between frequency corresponding to the peak value of rate and the sound pressure level curve is greater than preset value, then using the increase target vehicle body
The method of the local quality of the local stiffness or reduction target body structure of structure optimizes, the target after being optimized
Body structure；
If frequency corresponding to peak value of the frequency of the target modalities lower than the sound pressure level curve, and the frequency of the target modalities
Difference between frequency corresponding to the peak value of rate and the sound pressure level curve is greater than the preset value, then using the reduction target
The method of the local quality of the local stiffness or increase target body structure of body structure optimizes, after being optimized
Target body structure；
If the difference between frequency corresponding to the peak value of the frequency of the target modalities and the sound pressure level curve is less than or equal to
The preset value is then optimized using the reduction target body structure vibration amplitude method, the target carriage after being optimized
Body structure, wherein the reduction target body structure vibration amplitude method includes at least one of: increase damping fin,
Increase bump leveller.
6. a kind of Optimum Design System for improving noise transfer function, which is characterized in that be applied to terminal device, the system packet
It includes:
First model building module, for establishing the geometrical model for reorganizing and outfit vehicle body of vehicle to be optimized；
Second model building module obtains for reorganizing and outfit the finite element model of vehicle body described in establishing based on the geometrical model
One finite element model；The finite element model that crew module's operatic tunes is established based on first finite element model, obtains the second finite element
Model；
Noise transfer function analysis module, for carrying out noise to first finite element model and second finite element model
Transfer function analysis obtains the sound pressure level curve of noise transfer function；
Panel division module, the sheet metal component for will be coupled in first finite element model with crew module's operatic tunes carry out
Panel divides, and obtains multiple panels；
Contribution amount analysis module, for carrying out panel contribution amount to the multiple panel based on the peak value in the sound pressure level curve
It is analyzed with modal contribution amount, determines the target board and target modalities for causing the peak value in the sound pressure level curve；
Structure optimization module, for the body structure based on the target board and the target modalities to the vehicle to be optimized
It optimizes, the target body structure after being optimized；
Model modification module, for modifying first finite element model and described based on the target body structure after the optimization
Second finite element model, the second finite element model after the first finite element model and optimization after being optimized.
7. system according to claim 6, which is characterized in that the structure optimization module includes:
Determination unit, for determining the target body structure of vehicle to be optimized based on the target board and the target modalities；
Target modalities frequency cells are improved, for using the local stiffness or the reduction target for increasing the target body structure
The method of the local quality of body structure optimizes the body structure of the vehicle to be optimized, the target carriage after being optimized
Body structure；
Target modalities frequency cells are reduced, for using the local stiffness or the increase target for reducing the target body structure
The method of the local quality of body structure optimizes the body structure of the vehicle to be optimized, the target carriage after being optimized
Body structure；
Reduce vibration amplitude unit, reduces the target body structure vibration amplitude method to the vehicle to be optimized for using
Body structure optimize, the target body structure after being optimized, wherein the reduction vibration amplitude method includes following
At least one: increase damping fin, increase bump leveller.
8. system according to claim 6, which is characterized in that the system also includes: comparison module is used for:
Noise biography is carried out again according to the first finite element model after the optimization and the second finite element model after the optimization
Delivery function analysis, the sound pressure level curve of the noise transfer function after being optimized；
Whether the sound pressure level peak of curve of the noise transfer function after comparing the optimization is less than or equal to preset target value；
If it is, terminating optimization.
9. a kind of electronic equipment, including memory, processor, be stored in the memory to run on the processor
Computer program, which is characterized in that the processor realizes that the claims 1 to 5 are any when executing the computer program
The step of method described in item.
10. a kind of computer-readable medium for the non-volatile program code that can be performed with processor, which is characterized in that described
Program code makes the processor execute described any the method for claim 1-5.
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Application publication date: 20190514 |