CN109086536A - A kind of NTF improved method based on topography optimization - Google Patents
A kind of NTF improved method based on topography optimization Download PDFInfo
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- CN109086536A CN109086536A CN201810914114.5A CN201810914114A CN109086536A CN 109086536 A CN109086536 A CN 109086536A CN 201810914114 A CN201810914114 A CN 201810914114A CN 109086536 A CN109086536 A CN 109086536A
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- 238000005457 optimization Methods 0.000 title claims abstract description 36
- 238000012876 topography Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000004458 analytical method Methods 0.000 claims abstract description 20
- 230000004044 response Effects 0.000 claims abstract description 18
- 230000005284 excitation Effects 0.000 claims abstract description 10
- 238000004613 tight binding model Methods 0.000 claims abstract description 9
- 238000004364 calculation method Methods 0.000 claims abstract description 4
- 239000006096 absorbing agent Substances 0.000 claims description 7
- 230000035939 shock Effects 0.000 claims description 7
- 240000006409 Acacia auriculiformis Species 0.000 claims description 6
- 210000005069 ears Anatomy 0.000 claims description 6
- 230000002596 correlated effect Effects 0.000 claims description 3
- 210000003205 muscle Anatomy 0.000 claims description 3
- 238000012805 post-processing Methods 0.000 abstract 1
- 238000013461 design Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 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
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- Automation & Control Theory (AREA)
- Aviation & Aerospace Engineering (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
Abstract
The NTF improved method based on topography optimization that the object of the present invention is to provide a kind of, using finite element method, TB model harmony cavity mold type is established, loads the excitation in three directions respectively to vehicle body and each attachment point in chassis, computation model solves, and obtains the homologous thread between frequency and acoustic pressure by post-processing.The sound pressure curve chosen more than target value corresponds to frequency at peak value, finds out under the frequency, the biggish components of panel contribution amount, carries out topography optimization.Using the structure after optimization, NTF calculating is re-started, more reasonable result is obtained.The technical solution of the present invention is as follows: carrying out NTF analysis to vehicle archetype, find out wherein nonconformance, topography optimization is carried out for related components, structure after optimization is substituted into archetype, keep other input conditions constant, NTF analytical calculation, the response curve of comparison optimization front and back are carried out again.
Description
Technical field
The invention belongs to the fields computer-aided engineering (CAE), and in particular to a kind of improvement side NTF based on topography optimization
Method.
Background technique
NVH performance is to measure an integrated performance index of automobile manufacture quality.As people are to passenger car quality requirements
Increasingly raising, promoting vehicle NVH performance becomes one of the main problem that vehicle and components manufacturer pay close attention to.NTF(Noise
Transfer Function noise transfer function) analysis mainly the design phase it is horizontal to the excitation transmitting of the sound and vibration of car body into
Row prediction and assessment.Whether this index is reasonable, is an important evaluation criterion of vehicle NVH exploitation.
Method of this patent based on topography optimization finds maximum in conjunction with the analysis of vehicle body coupled vibro-acoustic panel contribution amount is reorganized and outfit
The maximum part of acoustic pressure respective frequencies lower panel contribution amount simultaneously carries out topography optimization.Using the structure after optimization, NTF is carried out again
Analysis reduces the sound pressure level investigated under frequency, improves vehicle NVH performance, provides reference for body structure design.
Summary of the invention
The object of the present invention is to provide a kind of, and the NTF improved method based on topography optimization establishes TB using finite element method
Model harmony cavity mold type loads the excitation in three directions to vehicle body and each attachment point in chassis respectively, and computation model solves, by rear
Processing obtains the homologous thread between frequency and acoustic pressure.The sound pressure curve chosen more than target value corresponds to frequency at peak value, finds out
Under the frequency, the biggish components of panel contribution amount carry out topography optimization.Using the structure after optimization, NTF meter is re-started
It calculates, obtains more reasonable result.
The technical solution of the present invention is as follows: carrying out NTF analysis to vehicle archetype, wherein nonconformance is found out, for phase
It closes components and carries out topography optimization, the structure after optimization is substituted into archetype, keeps other input conditions constant, again
NTF analytical calculation is carried out, it is as follows to make a concrete analysis of process step for the response curve of comparison optimization front and back:
Step 1 establishes TB grid model harmony cavity mold type according to vehicle geometric data, wherein includes white vehicle in TB model
Body, car door lid, interior exterior trim, chassis and electric appliance related system, part in exterior trim and electric appliance；
Step 2 establishes analysis operating condition: loading the excitation in tri- direction X, Y, Z respectively in vehicle body attachment point, frequency sweep model is arranged
It encloses, output response point X is to shift value；
Step 3, result treatment obtain response curve；
Step 4 chooses wherein underproof point, does the analysis of panel contribution amount, finds the biggish panel of contribution amount and response
Position, point load X is to when excitation on rear shock absorber known to NTF analysis result, the sound of driver's auris dextra and the left ear of heel row occupant
Pressure reaches maximum amplitude in 32Hz, is analyzed by panel contribution amount, it is larger to find contribution amount under maximum amplitude respective frequencies
Panel, i.e. 32Hz when, the biggish panel of contribution amount is the left front door and left back door correlated parts coupled with the operatic tunes, predominantly left
Front door inner panel and left back door inner panel；
Step 5, the panel component big to contribution amount carry out topography optimization, retain main mounting hole and mounting surface, to improve
Inner plate of car door local mode is target, carries out topography optimization to front door inner panel and back door inner panel respectively, and most raised muscle height is
5mm；
Step 6, by the front door inner panel after optimization and before back door inner panel is substituted into original TB model, other inputs are kept
It is constant, calculating is resubmited, the NTF result after being optimized.
Beneficial effects of the present invention are the method using topography optimization, optimize, have assisted to NTF analysis result
The assessment for motivating transmitting horizontal at sound and vibration.Its major advantage is:
1, by the method for topography optimization, body structure is optimized, provides reference for bodywork parts design；
2, the method optimized using row looks can be provided optimum ideals to parts design, play directive significance, reduce blind
It the time of mesh change and design, provides and greatly shortens the product design period.
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 TB model schematic of the present invention；
Fig. 2 is operatic tunes model schematic of the present invention；
Fig. 3 be rear shock absorber of the present invention on point load X to motivate when, the schematic diagram of driver's auris dextra pressure response；
Fig. 4 be rear shock absorber of the present invention on point load X to motivate when, the schematic diagram of the left ear pressure response of occupant；
Fig. 5 is that front door of the present invention and back door inner panel optimize forward and backward, acoustic pressure correlation curve.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, 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 the description of the present invention, it should be noted that unless otherwise clearly defined and limited, 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.
Embodiment
Fig. 1 is TB model schematic of the present invention；Fig. 2 is operatic tunes model schematic of the present invention；Fig. 3 is rear shock absorber of the present invention
It is upper point load X to excitation when, the schematic diagram of driver's auris dextra pressure response；Fig. 4 be on rear shock absorber of the present invention point load X to sharp
When encouraging, the schematic diagram of the left ear pressure response of occupant；Fig. 5 is that front door of the present invention and the optimization of back door inner panel are forward and backward, and acoustic pressure comparison is bent
Line.It is as shown in the figure:
NTF analysis is carried out to archetype, finds out wherein nonconformance.Topography optimization is carried out for related components, it will
Structure after optimization is substituted into archetype, keeps other input conditions constant, carries out NTF analytical calculation again, is compared excellent
Change the response curve of front and back.By taking certain four passenger car as an example, the analysis process of this emulation is as follows:
1. establishing TB grid model harmony cavity mold type according to vehicle geometric data.It wherein include white body, vehicle in TB model
Door closure, interior exterior trim, chassis and electric appliance related system.Exterior trim and electric appliance in part do not need to establish complete grid model,
Directly substituted with lumped mass.
2. establishing analysis operating condition: the excitation in tri- direction X, Y, Z is loaded respectively in vehicle body attachment point, and swept frequency range is set, it is defeated
Response point (driver's auris dextra and the left ear of heel row occupant) X is to shift value out.
3. result treatment obtains response curve.
4. choosing wherein underproof point, the analysis of panel contribution amount is done, finds the biggish panel of contribution amount and response position.
Point (left side) loads X to when excitation on rear shock absorber known to NTF analysis result, the sound of driver's auris dextra and the left ear of heel row occupant
Pressure reaches maximum amplitude in 32Hz.It is analyzed by panel contribution amount, it is larger to find contribution amount under maximum amplitude respective frequencies
Panel.That is when 32Hz, the biggish panel of contribution amount is the left front door and left back door correlated parts coupled with the operatic tunes, predominantly left
Front door inner panel and left back door inner panel.
5. the big panel component of pair contribution amount carries out topography optimization.Retain main mounting hole and mounting surface, to improve car door
Inner panel local mode is target, carries out topography optimization to front door inner panel and back door inner panel respectively, and most raised muscle height is 5mm.
6. by the front door inner panel after optimization and before back door inner panel is substituted into original TB model, other inputs are remained unchanged,
Calculating is resubmited, the NTF result after being optimized.
7. comparison optimizes forward and backward, two response curves.It was found that acoustic pressure maximum amplitude has different degrees of reduction when 32Hz.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (1)
1. a kind of NTF improved method based on topography optimization, which is characterized in that carry out NTF analysis to vehicle archetype, find out
Wherein nonconformance carries out topography optimization for related components, the structure after optimization is substituted into archetype, it is kept
His input condition is constant, carries out NTF analytical calculation again, the response curve of comparison optimization front and back, concrete analysis process step is such as
Under:
Step 1 establishes TB grid model harmony cavity mold type according to vehicle geometric data, wherein in TB model comprising white body,
Car door lid, interior exterior trim, chassis and electric appliance related system, part in exterior trim and electric appliance；
Step 2 establishes analysis operating condition: the excitation in tri- direction X, Y, Z loaded respectively in vehicle body attachment point, and swept frequency range is set, it is defeated
Response point X is to shift value out；
Step 3, result treatment obtain response curve；
Step 4 chooses wherein underproof point, does the analysis of panel contribution amount, finds the biggish panel of contribution amount and response bit
It sets, point load X is to when excitation on rear shock absorber known to NTF analysis result, the acoustic pressure of driver's auris dextra and the left ear of heel row occupant
Reach maximum amplitude in 32Hz, analyzed by panel contribution amount, it is biggish to find contribution amount under maximum amplitude respective frequencies
When panel, i.e. 32Hz, the biggish panel of contribution amount is the left front door and left back door correlated parts coupled with the operatic tunes, predominantly left front
Door inner panel and left back door inner panel；
Step 5, the panel component big to contribution amount carry out topography optimization, retain main mounting hole and mounting surface, to improve car door
Inner panel local mode is target, carries out topography optimization to front door inner panel and back door inner panel respectively, and most raised muscle height is 5mm；
Step 6, by the front door inner panel after optimization and before back door inner panel is substituted into original TB model, other inputs are remained unchanged,
Calculating is resubmited, the NTF result after being optimized.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810914114.5A CN109086536A (en) | 2018-08-13 | 2018-08-13 | A kind of NTF improved method based on topography optimization |
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| CN201810914114.5A CN109086536A (en) | 2018-08-13 | 2018-08-13 | A kind of NTF improved method based on topography optimization |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109753722A (en) * | 2018-12-29 | 2019-05-14 | 北京长城华冠汽车技术开发有限公司 | A kind of optimum design method and system improving noise transfer function |
| CN110263408A (en) * | 2019-06-13 | 2019-09-20 | 中汽研（天津）汽车工程研究院有限公司 | A method of utilizing BNI curve assessment NTF risk |
| CN112417590A (en) * | 2020-11-13 | 2021-02-26 | 广州汽车集团股份有限公司 | Vehicle body design optimization method and device, automobile and storage medium |
-
2018
- 2018-08-13 CN CN201810914114.5A patent/CN109086536A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109753722A (en) * | 2018-12-29 | 2019-05-14 | 北京长城华冠汽车技术开发有限公司 | A kind of optimum design method and system improving noise transfer function |
| CN110263408A (en) * | 2019-06-13 | 2019-09-20 | 中汽研（天津）汽车工程研究院有限公司 | A method of utilizing BNI curve assessment NTF risk |
| CN110263408B (en) * | 2019-06-13 | 2023-04-25 | 中汽研（天津）汽车工程研究院有限公司 | Method for evaluating NTF risk by using BNI curve |
| CN112417590A (en) * | 2020-11-13 | 2021-02-26 | 广州汽车集团股份有限公司 | Vehicle body design optimization method and device, automobile and storage medium |
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