CN109596363A - A kind of NVH matching process - Google Patents
A kind of NVH matching process Download PDFInfo
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- CN109596363A CN109596363A CN201811525662.5A CN201811525662A CN109596363A CN 109596363 A CN109596363 A CN 109596363A CN 201811525662 A CN201811525662 A CN 201811525662A CN 109596363 A CN109596363 A CN 109596363A
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- component
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- intrinsic frequency
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- ots
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of NVH matching process, belong to mechanical NVH performance technologies field.The described method includes: detecting the intrinsic frequency of component to be matched, testing result is obtained；It will test result and carry out judgement of stability, screening meets the component to be matched of stability requirement；The testing result that the component to be matched of stability requirement will be met, is compared with the intrinsic frequency of matching block, is screened and the consistent component to be matched of matching block NVH characteristic according to comparison result.The present invention avoids frequently using NVH bench test, has saved match test expense, shortens the matching period, greatly enhances component NVH matching efficiency, strong applicability can be applied to the matched several scenes of NVH of a variety of mechanical parts.
Description
Technical field
The present invention relates to mechanical NVH performance technologies field, in particular to a kind of NVH matching process.
Background technique
NVH (noise, vibration and sound vibration roughness, Noise, Vibration, Harshness) is to measure automobile manufacture matter
One global question of amount, it is experienced as most directly and most surface to user vehicle.The NVH problem of vehicle is international vapour
One of the problem of major vehicle manufacturing enterprise of vehicle industry and parts enterprises are paid close attention to.There is statistics to show, there are about 1/3 events for vehicle
Barrier problem is that have relationship with the NVH problem of vehicle, and each major company has nearly 20% R & D Cost to consume in the NVH for solving vehicle
In problem.
In the exploitation of wheel stand or production domesticization accreditation process, it is necessary to carry out NVH matching.Generality is to pass through at present
NVH bench test to carry out NVH matching to wheel stand: on inertia testing stand, a whole set of hind axle assembly is installed, according to NVH
Bench test specification carries out match test.One about 200,000 RMB of NVH bench test expense, the test period about 1 month, therefore
This kind of NVH matching scheme testing expenses are high, and the test period is long, and the NVH bench test being related to only has a small number of mechanisms can be with
Carry out, applicability is not high.
Summary of the invention
In order to solve problems in the prior art, the embodiment of the invention provides a kind of NVH matching process, portion to be matched is saved
Part needs to use NVH bench test without exception, saves match test expense, shortens the matching period, to improve mechanical part NVH
Matching efficiency, strong applicability.
The technical solution is as follows:
Provide a kind of NVH matching process, which comprises
The intrinsic frequency of component to be matched is detected, testing result is obtained；
It will test result and carry out judgement of stability, screening meets the component to be matched of stability requirement；
The testing result that the component to be matched of stability requirement will be met, is compared with the intrinsic frequency of matching block
Compared with according to comparison result screening and the consistent component to be matched of matching block NVH characteristic.
Preferably, the intrinsic frequency of component to be matched is detected, testing result is obtained, comprising:
The intrinsic frequency of component to be matched is detected by pulsed transfer function measurement method.
Preferably, the intrinsic frequency of component to be matched is detected, testing result is obtained, comprising:
Component OTS exemplar to be matched is selected at random；
It is more than so that the component OTS exemplar is in free shape after 24 hours that the component OTS exemplar, which is placed in room temperature,
State hangs or lies on foam-rubber cushion, detects the intrinsic frequency of the component OTS exemplar by scheduled measurement method at room temperature
Rate, wherein the frequency of the foam-rubber cushion is less than 50Hz.
Preferably, the component OTS exemplar meets the following conditions:
The component OTS exemplar is wheel stand OTS exemplar, left wheel bracket OTS exemplar therein and right wheel stand
OTS exemplar is equal in number；And/or
The wheel stand OTS exemplar is from multiple and different die cavity or batch.
Preferably, the scheduled measurement method includes:
The corresponding connection for choosing two threaded holes for connecting brake-caliper support on the wheel stand OTS exemplar is flat
Face, pulse hammer connect the input tapped in plane as excitation at wherein one, and sensor, which is adhesive in, connects plane at another
On, the signal that transmitting comes is received, to complete the detection of the wheel stand OTS exemplar axial natural frequency.
Preferably, the intrinsic frequency of component to be matched is detected, testing result is obtained, comprising:
By power hammer excitation, feedback signal is measured by acceleration transducer, and by meeting bandwidth and required precision
Multichannel or double channel data acquisition instrument obtain measurement data.
Preferably, the frequency measurement range for carrying out the signal pickup assembly of signal acquisition is 100Hz~10kHz, frequency point
Resolution is not less than 1Hz.
Preferably, it will test result and carry out judgement of stability, screening meets the component to be matched of stability requirement, comprising:
Mean value MW1, MW2 ... the MWj of intrinsic frequency under each mode of component to be matched is calculated according to testing result, wherein j
For the integer greater than 1, MWj is the intrinsic frequency mean value under j mode, choose intrinsic frequency mean control under each mode ±
Component to be matched within a%, i.e. MWj meet the following conditions:
USGj=(1-a%) * MWj
OSGj=(1+a%) * MWj
Wherein, USGj is the intrinsic frequency lower limit value of mode j, and OSGj is the intrinsic frequency upper limit value of mode j.
Preferably, the testing result of the component to be matched of stability requirement, the intrinsic frequency with matching block will be met
It is compared, is screened and the consistent component to be matched of matching block NVH characteristic according to comparison result, comprising:
The testing result that the component to be matched of stability requirement will be met, is compared with the intrinsic frequency of matching block
Compared with comparison result is eligible: | MWj1-MWj2 | the component to be matched of/MWj2≤a% is determined as and matching block NVH
Characteristic is consistent, wherein MWj1 is the intrinsic frequency mean value of component to be matched, and MWj2 is the intrinsic frequency mean value of matching block.
Technical solution provided in an embodiment of the present invention has the benefit that
1, the test period is shorter, can be detected completion within one day, improves NVH matching efficiency；And the NVH platform in known field
Frame test usually requires 1 month time；
2, experimentation cost is cheap, saves match test expense, and NVH bench test well known in the art usually requires 200,000
RMB；
3, it is less to be related to testpieces, and do not damage testpieces；And NVH bench test well known in the art need it is whole
Rear axle is covered, and brake disc and friction plate can be lossy after the test；
4, detection method is simple and easy, and many testing agencies can all carry out.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is NVH matching process flow chart provided in an embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached in the embodiment of the present invention
Figure, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only this
Invention a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.It needs
Bright, in the description of the present invention, the meaning of " plurality " is two or more, unless otherwise specifically defined.
There is different mode of oscillations according to the different shape of mechanical part, each mode of oscillation corresponds to an intrinsic frequency again
Rate treats matching block and the intrinsic frequency of matching block compares due to the NVH characteristic of mode of oscillation deciding part,
If intrinsic frequency is consistent, the NVH match test result of two kinds of wheel stands can be equivalent, to save wheel stand to be matched
NVH bench test.Based on the above principles, the embodiment of the invention provides a kind of component NVH matching process, to be matched by detecting
The intrinsic frequency of component, and guarantee the stability of its testing result, it is examined eventually by the intrinsic frequency that will ensure stability requirement
Measured value is compared with the natural frequency value of matching block, is finally screened and matching block NVH characteristic according to comparison result
Consistent component to be matched avoids frequently using NVH bench test, has saved match test expense, shortens the matching period, very
Component NVH matching efficiency is improved in big degree, strong applicability can be applied to the matched a variety of fields NVH of a variety of mechanical parts
Scape is particularly suitable for wheel stand NVH matching scene, needs a whole set of rear axle progress NVH bench test, testing expenses to improve
The state of the art high, the period is long.
Combined with specific embodiments below and attached drawing, it elaborates to NVH matching process provided in an embodiment of the present invention, this
In illustratively select wheel stand component carry out respective description.
Fig. 1 is NVH matching process flow chart provided in an embodiment of the present invention, as shown in Figure 1, provided in an embodiment of the present invention
NVH matching process, comprising the following steps:
The intrinsic frequency of S1, detection component to be matched, obtain testing result.
Specifically, detecting the intrinsic frequency of component to be matched by pulsed transfer function measurement method.
Wheel stand has different change in shape, and different change in shape reflects the different mode of oscillations of wheel stand.
Determine wheel stand NVH characteristic, the exactly mode of oscillation of wheel stand.Due to corresponding one intrinsic frequency of each mode of oscillation
Rate, so, the comparison of two kinds of wheel stand NVH characteristics can be realized by the comparison of intrinsic frequency under different modalities.Certainly right
The basis of ratio is the wheel stand for having matched completion, that is, wheel stand that is qualified or meeting desired standard, this has matched branch
Frame can complete matching by any possible NVH characteristic test matching process in the prior art, preferably pass through existing NVH platform
Matching is completed in frame test, high-precision for the matched standard of NVH to obtain.
Preferably, above-mentioned detection process is accomplished by the following way:
Wheel stand OTS to be matched (initial exemplar, Off Tool Sample) exemplar is selected at random, further preferably
Ground, wheel stand OTS exemplar meet the following conditions: in the wheel stand OTS exemplar selected, left wheel bracket OTS therein
Exemplar and right wheel stand OTS exemplar are equal in number, such as each 10；And/or wheel stand OTS exemplar is from multiple and different
Die cavity or batch because when wheel stand OTS exemplar as far as possible from different die cavity or batch, being capable of better control
Batch state；
It is more than so that wheel stand OTS exemplar is in free shape after 24 hours that wheel stand OTS exemplar, which is placed in room temperature,
State hangs or lies on foam-rubber cushion, detects the intrinsic frequency of wheel stand OTS exemplar by scheduled measurement method at room temperature
Rate, wherein the frequency of foam-rubber cushion is less than 50Hz.It is further preferred that above-mentioned scheduled measurement method includes: to choose wheel stand OTS
The corresponding connection plane of two threaded holes for connecting brake-caliper support on exemplar, a pulse hammer connection plane wherein
The upper input tapped as excitation, sensor are adhesive in another connection plane, the signal that transmitting comes are received, to complete
The detection of wheel stand OTS exemplar axial natural frequency.
Period can measure feedback signal by acceleration transducer, and by meeting bandwidth and precision by power hammer excitation
It is required that multichannel or double channel data acquisition instrument obtain measurement data, pass through the measurement of the transmission function between excitation and feedback
Realize the detection of intrinsic frequency.Also, the frequency measurement range for being preferably used for the signal pickup assembly of signal acquisition is 100Hz
~10kHz, frequency resolution are not less than 1Hz.
S2, it will test result progress judgement of stability, screening meets the component to be matched of stability requirement.
Specifically, calculating the mean value MW1, MW2 ... of intrinsic frequency under each mode of component to be matched according to testing result
MWj, wherein j is the integer greater than 1, and MWj is the intrinsic frequency mean value under j mode, chooses the intrinsic frequency mean value under each mode
The component to be matched within ± a% is controlled, i.e. MWj meets the following conditions:
USGj=(1-a%) * MWj
OSGj=(1+a%) * MWj
Wherein, USGj is the intrinsic frequency lower limit value of mode j, and OSGj is the intrinsic frequency upper limit value of mode j.
A% value is that we provide the value of stability requirement in advance, is not changed with measured result；We combine and survey out
Mean value and a%, the upper limit value and lower limit value of mode j intrinsic frequency can be calculated --- it is required that actual measurement monodrome all in bound model
In enclosing.It is, of course, also possible to alternatively, calculate mean value by measured value, at the same select from measured value maximum value and
Minimum value calculates maximum, minimum value and mean value deviation, sees whether the deviation is less than a%.
Because needing to carry out judgement evaluation to testing result after completing detection, require to be divided to two herein: stability is wanted
Frequency comparison of summing requires.Wherein stability requirement is the basic demand to wheel stand stability, and frequency comparison requires to be used for
It whether consistent evaluates two kinds of wheel stand NVH characteristics, is detailed in step S3.
S3, will meet stability requirement component to be matched testing result, carried out with the intrinsic frequency of matching block
Compare, is screened and the consistent component to be matched of matching block NVH characteristic according to comparison result.
Specifically, the intrinsic frequency by the testing result for the component to be matched for meeting stability requirement, with matching block
It is compared, comparison result is eligible: | MWj1-MWj2 | the component to be matched of/MWj2≤a% is determined as and matching part
Part NVH characteristic is consistent, wherein MWj1 is the intrinsic frequency mean value of component to be matched, and MWj2 is the intrinsic frequency of matching block
Mean value.
All the above alternatives can form alternative embodiment of the invention using any combination, herein no longer
It repeats one by one.
In conclusion NVH matching process provided in an embodiment of the present invention, has the advantages that compared with prior art
1, the test period is shorter, can be detected completion within one day, improves NVH matching efficiency；And the NVH platform in known field
Frame test usually requires 1 month time；
2, experimentation cost is cheap, saves match test expense, and NVH bench test well known in the art usually requires 200,000
RMB；
3, it is less to be related to testpieces, and do not damage testpieces；And NVH bench test well known in the art need it is whole
Rear axle is covered, and brake disc and friction plate can be lossy after the test；
4, detection method is simple and easy, and many testing agencies can all carry out.
Those of ordinary skill in the art will appreciate that realizing that all or part of the steps of above-described embodiment can pass through hardware
It completes, relevant hardware can also be instructed to complete by program, the program can store in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only memory, disk or CD etc..
It is referring to according to the method for embodiment, equipment (system) and calculating in the embodiment of the present application in the embodiment of the present application
The flowchart and/or the block diagram of machine program product describes.It should be understood that can be realized by computer program instructions flow chart and/or
The combination of the process and/or box in each flow and/or block and flowchart and/or the block diagram in block diagram.It can mention
For the processing of these computer program instructions to general purpose computer, special purpose computer, Embedded Processor or other programmable datas
The processor of equipment is to generate a machine, so that being executed by computer or the processor of other programmable data processing devices
Instruction generation refer to for realizing in one or more flows of the flowchart and/or one or more blocks of the block diagram
The device of fixed function.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although the preferred embodiment in the embodiment of the present application has been described, once a person skilled in the art knows
Basic creative concept, then additional changes and modifications may be made to these embodiments.So appended claims are intended to explain
Being includes preferred embodiment and all change and modification for falling into range in the embodiment of the present application.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (9)
1. a kind of NVH matching process, which is characterized in that the described method includes:
The intrinsic frequency of component to be matched is detected, testing result is obtained；
It will test result and carry out judgement of stability, screening meets the component to be matched of stability requirement；
The testing result that the component to be matched of stability requirement will be met, is compared, root with the intrinsic frequency of matching block
It is screened and the consistent component to be matched of matching block NVH characteristic according to comparison result.
2. obtaining detection knot the method according to claim 1, wherein detecting the intrinsic frequency of component to be matched
Fruit, comprising:
The intrinsic frequency of component to be matched is detected by pulsed transfer function measurement method.
3. the method according to any one of claims 1 and 2, which is characterized in that the intrinsic frequency for detecting component to be matched obtains
Obtain testing result, comprising:
Component OTS exemplar to be matched is selected at random；
It is more than so that the component OTS exemplar is in free state after 24 hours that the component OTS exemplar, which is placed in room temperature, is hanged
It hangs or lies on foam-rubber cushion, detect the intrinsic frequency of the component OTS exemplar by scheduled measurement method at room temperature,
Described in foam-rubber cushion frequency be less than 50Hz.
4. according to the method described in claim 3, it is characterized in that, the component OTS exemplar meets the following conditions:
The component OTS exemplar is wheel stand OTS exemplar, left wheel bracket OTS exemplar therein and right wheel stand OTS sample
Part is equal in number；And/or
The wheel stand OTS exemplar is from multiple and different die cavity or batch.
5. according to the method described in claim 4, it is characterized in that, the scheduled measurement method includes:
The corresponding connection plane of two threaded holes for connecting brake-caliper support on the wheel stand OTS exemplar is chosen,
Pulse hammer connects the input tapped in plane as excitation at wherein one, and sensor is adhesive in another connection plane,
The signal that transmitting comes is received, to complete the detection of the wheel stand OTS exemplar axial natural frequency.
6. the method according to any one of claims 1 and 2, which is characterized in that the intrinsic frequency for detecting component to be matched obtains
Obtain testing result, comprising:
By power hammer excitation, feedback signal, and the multi-pass by meeting bandwidth and required precision are measured by acceleration transducer
Road or double channel data acquisition instrument obtain measurement data.
7. according to the method described in claim 6, it is characterized in that, carrying out the frequency measurement of the signal pickup assembly of signal acquisition
Range is 100Hz~10kHz, and frequency resolution is not less than 1Hz.
8. the method according to any one of claims 1 and 2, which is characterized in that will test result and carry out judgement of stability, sieve
Choosing meets the component to be matched of stability requirement, comprising:
Mean value MW1, MW2 ... the MWj of intrinsic frequency under each mode of component to be matched is calculated according to testing result, and wherein j is big
In 1 integer, MWj is the intrinsic frequency mean value under j mode, choose intrinsic frequency mean control under each mode ± a% with
Interior component to be matched, i.e. MWj meet the following conditions:
USGj=(1-a%) * MWj
OSGj=(1+a%) * MWj
Wherein, USGj is the intrinsic frequency lower limit value of mode j, and OSGj is the intrinsic frequency upper limit value of mode j.
9. the method according to any one of claims 1 and 2, which is characterized in that the portion to be matched of stability requirement will be met
The testing result of part is compared with the intrinsic frequency of matching block, is screened according to comparison result special with matching block NVH
The consistent component to be matched of property, comprising:
The testing result that the component to be matched of stability requirement will be met, is compared with the intrinsic frequency of matching block, will
Comparison result is eligible: | MWj1-MWj2 | the component to be matched of/MWj2≤a% is determined as and matching block NVH characteristic one
It causes, wherein MWj1 is the intrinsic frequency mean value of component to be matched, and MWj2 is the intrinsic frequency mean value of matching block.
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| AT504316A2 (en) * | 2006-09-20 | 2008-04-15 | Gif Gmbh | TEST BENCH FOR MEASURING NVH FEATURES OF A TRANSMISSION TEST, CONNECTION SHAFT FOR AN INSPECTION STATION, USE OF AN ADAPTER SHAFT AND METHOD OF MEASURING NVH PROPERTIES |
| CN104214262A (en) * | 2014-08-21 | 2014-12-17 | 清华大学苏州汽车研究院（相城） | Dynamic vibration absorber capable of improving NVH and matching method thereof |
| CN205879553U (en) * | 2016-07-18 | 2017-01-11 | 华东交通大学 | High speed train bogie wheel pair modal analysis's test device |
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2018
- 2018-12-13 CN CN201811525662.5A patent/CN109596363A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5814963A (en) * | 1995-10-09 | 1998-09-29 | Eurocopter France | Device for damping the vibrations of a structure subjected to dynamic stresses |
| CN1619275A (en) * | 2003-11-17 | 2005-05-25 | 尤洛考普特公司 | Method to tune a vibration damping device |
| AT504316A2 (en) * | 2006-09-20 | 2008-04-15 | Gif Gmbh | TEST BENCH FOR MEASURING NVH FEATURES OF A TRANSMISSION TEST, CONNECTION SHAFT FOR AN INSPECTION STATION, USE OF AN ADAPTER SHAFT AND METHOD OF MEASURING NVH PROPERTIES |
| KR100787238B1 (en) * | 2006-11-09 | 2007-12-21 | 한국기계연구원 | Driveline test bench for automotive chassis system and test method using the same |
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