CN113340576A - Method for formulating EOL (equivalent of load) test limit value of automobile part - Google Patents
Method for formulating EOL (equivalent of load) test limit value of automobile part Download PDFInfo
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- CN113340576A CN113340576A CN202110564042.8A CN202110564042A CN113340576A CN 113340576 A CN113340576 A CN 113340576A CN 202110564042 A CN202110564042 A CN 202110564042A CN 113340576 A CN113340576 A CN 113340576A
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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
- G01M13/00—Testing of machine parts
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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
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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Abstract
The invention discloses a method for making an EOL test limit value of an automobile part, which comprises the following steps: mounting a part to be tested on a whole vehicle, and selecting a detection point in the whole vehicle; acquiring a vibration sound transfer frequency response function of a part from a mounting point on the whole vehicle to a detection point in the vehicle through a hammering test by using noise vibration test equipment, taking dB of a response value as a coordinate of the response value, and drawing a VTNTF function curve; calculating the difference value between the maximum value and the minimum value of the VTNTF function curve, carrying out M equal division on points on the VTNTF function curve, weighting the response values of the points on the VTNTF function curve according to intervals, and then normalizing the VTNTF curve, namely VTNTF-RE/max, and marking as VTNTF-RE-F; selecting critically acceptable parts on the whole vehicle to perform retest on EOL, performing Fourier transform to obtain a frequency domain curve of the parts, and multiplying the frequency domain curve by a VTNTF-RE-F curve to perform weighted calculation to obtain a limit value curve in the whole frequency spectrum.
Description
Technical Field
The invention belongs to the technical field of automobile part offline detection methods, and particularly relates to a method for formulating an EOL (equivalent EOL) test limit value of an automobile part.
Background
The common evaluation method is that one or more fixed evaluation limit values (which need to be approved and established by customers) are set for the concerned test objective quantity as indexes for evaluating whether the key automobile parts are qualified or not, but the expression of the key automobile parts installed on the whole automobile has strong correlation with the structure, strength, acoustic scheme and the like of the whole automobile, but the influence of the EOL test evaluation limit values is not considered, the traditional EOL limit value cannot comprehensively consider the global section expression of parts in a sensible sound frequency section (20-2000Hz) on the whole automobile, so that comprehensive complete limit values cannot be established, the limit values of some non-key frequency bands are easy to be over-strict, the production qualification rate of the parts is influenced, and the key frequency bands are loose, therefore, the correlation between the test value of the part on the EOL and the whole vehicle is relatively poor.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a scheme for comprehensively considering the structure, strength and acoustics of the whole vehicle, identifying the key frequency band, inhibiting the non-key frequency band and comprehensively formulating the EOL limit value aiming at the whole perceptible audio frequency band.
In order to achieve the purpose, the invention provides the following technical scheme: a method for making an EOL test limit value of an automobile part comprises the following steps:
s1: mounting a part to be tested on a whole vehicle, and selecting a detection point in the whole vehicle;
s2: by using noise vibration testing equipment and through a hammering test, a vibration sound transfer frequency response function of a part from a mounting point on a whole vehicle to a detection point in the vehicle is obtained and recorded as VTNTF, the VTNTF is obtained by adopting the following formula,
VTNTF＝F(s(t))/F(x(t))；
f (s (t)): fourier transformation of the sound signal at the position of the detection point in the vehicle;
f (x (t)): fourier transform of vibration signals at the mounting points of the parts;
taking dB of the response value as a coordinate of the response value, and drawing a VTNTF function curve;
s3: calculating the difference value between the maximum value and the minimum value of the VTNTF function curve and carrying out M equal division, wherein M is a positive integer, then carrying out M equal division on points on the VTNTF function curve, dividing M intervals, respectively recording the intervals as N1, N2, … and NM, weighting the response value of the points on the VTNTF function curve according to the intervals, thereby reconstructing the VTNTF function curve, recording the reconstructed result as VTNTF-RE, and then normalizing the VTNTF curve, namely VTNTF-RE/max, and recording the reconstructed result as VTNTF-RE-F;
s4: selecting critically acceptable parts on the whole vehicle to perform retest on the EOL, performing Fourier transform to obtain a frequency domain curve of the parts, multiplying the frequency domain curve by a VTNTF-RE-F curve to perform weighted calculation to obtain a Limit value curve in the whole frequency spectrum, and marking the Limit value curve as Limit, wherein the Limit value curve can distinguish a key frequency band and a non-key frequency band on the whole vehicle, so that the relaxation control of EOL non-detection points can be realized, the qualification rate is improved, and the detection points are accurately controlled.
Further, in step S3, after the difference between the maximum value and the minimum value of the VTNTF function curve is calculated, 20 × log (max/min) is obtained and recorded as SN, and then M is performed, i.e., sep is SN/M, where max is the maximum value of the VTNTF function curve and min is the minimum value of the VTNTF function curve.
Further, in step S3, the value of sep is close to 3.
Further, in step S3, M-division is performed on the points on the VTNTF function curve according to min + index sep, where the index values are integers of 1, 2, and 3 … M in sequence.
Further, in step S3, when weighting the response values of the points on the VTNTF function curve by intervals, the weighting coefficients are index × 100%/M, where the index values are integers of 1, 2, and 3 … M in this order.
Further comprising step S5: the subsequent EOL detection of the component is weighted by the VTNTF/max curve and then compared with the Limit in step S4.
Compared with the prior art, the invention has the beneficial effects that: the EOL limit value making method considering the comprehensive performance of the whole vehicle can distinguish a key frequency band from a non-key frequency band according to factors such as the structure, the strength and the acoustic package of the whole vehicle, so that the reasonable EOL limit value is set after weighted calculation according to a VTNTF-RE curve, the EOL limit value relaxation control of the non-key frequency band is realized, the qualification rate is improved, the key frequency band is accurately controlled, and the correlation between the test value of a part on the EOL and the whole vehicle is improved.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a graph illustrating VTNTF function.
Detailed Description
In the description of the present invention, it should be noted that, for the terms of orientation, such as "central", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate that the orientation and positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific scope of the present invention.
Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, a definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features, and in the description of the invention, "a number" or "a number" means two or more unless explicitly specified otherwise.
A method for making an EOL test limit value of an automobile part comprises the following steps:
s1: mounting a part to be tested on a whole vehicle, and selecting a detection point in the whole vehicle;
s2: by using noise vibration testing equipment, through a hammering test, a vibration sound transfer frequency response function (frequency domain representation, the abscissa is Hz) of a part from a mounting point on a whole vehicle to a detection point in the vehicle is obtained and recorded as VTNTF, the VTNTF is obtained by adopting the following formula,
VTNTF＝F(s(t))/F(x(t))；
f (s (t)): fourier transformation of the sound signal at the position of the detection point in the vehicle;
f (x (t)): fourier transform of vibration signals at the mounting points of the parts;
taking dB of the response value as a coordinate of the response value, and drawing a VTNTF function curve;
s3: calculating the difference value between the maximum value and the minimum value of the VTNTF function curve and carrying out M equal division, wherein M is a positive integer, then carrying out M equal division on points on the VTNTF function curve, dividing M intervals, respectively recording the intervals as N1, N2, … and NM, weighting the response value of the points on the VTNTF function curve according to the intervals, thereby reconstructing the VTNTF function curve, recording the reconstructed result as VTNTF-RE, and then normalizing the VTNTF curve, namely VTNTF-RE/max, and recording the reconstructed result as VTNTF-RE-F;
s4: selecting critically acceptable parts on the whole vehicle to perform retest on the EOL, performing Fourier transform to obtain a frequency domain curve of the parts, multiplying the frequency domain curve by a VTNTF-RE-F curve to perform weighted calculation to obtain a Limit value curve in the whole frequency spectrum, and marking the Limit value curve as Limit, wherein the Limit value curve can distinguish a key frequency band and a non-key frequency band on the whole vehicle, so that the relaxation control of EOL non-detection points can be realized, the qualification rate is improved, and the detection points are accurately controlled.
In the invention, the in-car detection point is the position of a key in the car, such as the headrest of each seat in the cockpit.
The VTNTF function curve is drawn, and is similar to the VTNTF function curve shown in figure 2, the curve graph is not fixed, and the curve has different performances according to different real vehicles.
The VTNTF comprehensively considers factors such as the structure, the strength and the acoustic scheme of the whole vehicle and describes the transfer relation (frequency domain) from the vibration of a mounting point of a part on the whole vehicle to the sound response of a key position in the vehicle, in a VTNTF function curve, a point with a large value is a point with large noise response on the whole vehicle, namely a weak point of the structure, otherwise, the point with a strong structure and small noise response is used, and a key frequency band and a non-key frequency band can be identified.
Further, the maximum value (marked as max) of the curve of the VTNTF function is obtainedCalculating 20 log (max/min) of the difference value of the minimum value (min), recording the difference value as SN, calculating the log to prevent the objective value from having obvious difference in magnitude, and performing M equal division, namely sep is SN/M, wherein M is an integer, but the sep is closest to 3, performing energy division on the whole vehicle by using 3dB, naturally selecting other more proper values for sep, and performing M equal division on points on the curve according to min + index sep, wherein the index values are integers among 1, 2 and 3 … M in sequence and are divided into M sections, and the N sections are respectively recorded as N sections1、N2、…、NM。
And weighting the response values of points on the VTNTF curve according to intervals, wherein the weighting coefficients are index 100%/M, the index values are integers among 1, 2 and 3 … M in sequence, so that the reconstruction of the VTNTF curve is realized and is recorded as VTNTF-RE, and the further normalization curve, namely VTNTF-RE/max, is recorded as VTNTF-RE-F.
Further, a critical acceptable part on the whole vehicle is selected to carry out retest on the EOL to obtain a retest value, Fourier transform is carried out to obtain a frequency domain vibration curve of the part on the EOL, further, VTNTF-RE-F is taken as a weight-counting weight curve of EOL detection of the part before production line production, namely, the retest value curve is multiplied by the VTNTF-RE-F curve, the key frequency band is highlighted (accurately controlled and not lower than a critical value), the non-key frequency band is inhibited (broadened control), a Limit value is obtained and marked as Limit, the Limit curve considers factors of a comprehensive structure, a sound package and the like of the whole vehicle, the key frequency band and the non-key frequency band on the whole vehicle can be distinguished, namely, the broadened control of EOL non-key points can be realized, the qualification rate is improved, the key points are accurately controlled, weighting calculation is carried out by using VTNTF/max before the subsequent part is produced, namely, the EOL test curve is multiplied by the VTNTF/max curve, and compared to Limit.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (6)
1. A method for making an EOL test limit value of an automobile part is characterized by comprising the following steps:
s1: mounting a part to be tested on a whole vehicle, and selecting a detection point in the whole vehicle;
s2: by using noise vibration testing equipment and through a hammering test, a vibration sound transfer frequency response function of a part from a mounting point on a whole vehicle to a detection point in the vehicle is obtained and recorded as VTNTF, the VTNTF is obtained by adopting the following formula,
VTNTF＝F(s(t))/F(x(t))；
f (s (t)): fourier transformation of the sound signal at the position of the detection point in the vehicle;
f (x (t)): fourier transform of vibration signals at the mounting points of the parts;
taking dB of the response value as a coordinate of the response value, and drawing a VTNTF function curve;
s3: obtaining the difference value between the maximum value and the minimum value of the VTNTF function curve, carrying out M equal division, wherein M is a positive integer, then carrying out M equal division on points on the VTNTF function curve, dividing M intervals, and respectively recording the M intervals as N1、N2、…、NMWeighting the response value of a point on the VTNTF function curve according to an interval so as to reconstruct the VTNTF function curve, recording the reconstructed response value as VTNTF-RE, and then normalizing the VTNTF curve, namely VTNTF-RE/max, recording the normalized VTNTF curve as VTNTF-RE-F;
s4: selecting critically acceptable parts on the whole vehicle to perform retest on the EOL, performing Fourier transform to obtain a frequency domain curve of the parts, multiplying the frequency domain curve by a VTNTF-RE-F curve to perform weighted calculation to obtain a Limit value curve in the whole frequency spectrum, and marking the Limit value curve as Limit, wherein the Limit value curve can distinguish a key frequency band and a non-key frequency band on the whole vehicle, so that the relaxation control of EOL non-detection points can be realized, the qualification rate is improved, and the detection points are accurately controlled.
2. The method for formulating an EOL test limit for an automotive part of claim 1, wherein: in step S3, after the difference between the maximum value and the minimum value of the VTNTF function curve is calculated, 20 × log (max/min) is obtained and recorded as SN, and then M-division is performed, that is, sep is SN/M, where max is the maximum value of the VTNTF function curve and min is the minimum value of the VTNTF function curve.
3. The method for formulating an EOL test limit for an automotive part of claim 2, wherein: in step S3, sep is approximated to 3.
4. The method for formulating an EOL test limit for an automotive part of claim 3, wherein: in step S3, M-division is performed on the points on the VTNTF function curve according to min + index sep, where the index values are integers between 1, 2, and 3 … M in this order.
5. The method for formulating an EOL test limit for an automotive part of claim 4, wherein: in step S3, when weighting the response values of the points on the VTNTF function curve by intervals, the weighting coefficients are index × 100%/M, where the index values are integers of 1, 2, and 3 … M in this order.
6. The method for formulating an EOL test limit for an automotive part of claim 5, wherein: further comprising step S5: the subsequent EOL detection of the component is weighted by the VTNTF/max curve and then compared with the Limit in step S4.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092310A (en) * | 2016-04-21 | 2016-11-09 | 重庆理工大学 | A kind of automotive transmission vibration noise off-line test method |
| CN108387308A (en) * | 2018-02-27 | 2018-08-10 | 安徽江淮汽车集团股份有限公司 | Gearbox is uttered long and high-pitched sounds off-line test method and its detecting system |
| CN109540441A (en) * | 2019-01-08 | 2019-03-29 | 重庆青山工业有限责任公司 | Automobile gearbox is preloading lower internal vibration transmission function test macro and method |
| CN111103468A (en) * | 2018-10-26 | 2020-05-05 | 湖南中车时代电动汽车股份有限公司 | EMC (electro magnetic compatibility) testing method and device for electronic parts of new energy automobile |
| CN111209655A (en) * | 2019-12-30 | 2020-05-29 | 格特拉克（江西）传动系统有限公司 | Method for calculating and evaluating transmission squeaking sound in vehicle |
| CN112082757A (en) * | 2020-08-25 | 2020-12-15 | 格特拉克（江西）传动系统有限公司 | Gear surface evaluation method and device for gearbox |
| US20200393329A1 (en) * | 2019-06-14 | 2020-12-17 | Hyundai Motor Company | Diagnosing method of engine condition and diagnostic modeling method thereof |
| US20210134075A1 (en) * | 2019-11-01 | 2021-05-06 | Caterpillar Inc. | System and Method for Implementing a Preventative Maintenance Schedule |
-
2021
- 2021-05-24 CN CN202110564042.8A patent/CN113340576B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092310A (en) * | 2016-04-21 | 2016-11-09 | 重庆理工大学 | A kind of automotive transmission vibration noise off-line test method |
| CN108387308A (en) * | 2018-02-27 | 2018-08-10 | 安徽江淮汽车集团股份有限公司 | Gearbox is uttered long and high-pitched sounds off-line test method and its detecting system |
| CN111103468A (en) * | 2018-10-26 | 2020-05-05 | 湖南中车时代电动汽车股份有限公司 | EMC (electro magnetic compatibility) testing method and device for electronic parts of new energy automobile |
| CN109540441A (en) * | 2019-01-08 | 2019-03-29 | 重庆青山工业有限责任公司 | Automobile gearbox is preloading lower internal vibration transmission function test macro and method |
| US20200393329A1 (en) * | 2019-06-14 | 2020-12-17 | Hyundai Motor Company | Diagnosing method of engine condition and diagnostic modeling method thereof |
| US20210134075A1 (en) * | 2019-11-01 | 2021-05-06 | Caterpillar Inc. | System and Method for Implementing a Preventative Maintenance Schedule |
| CN111209655A (en) * | 2019-12-30 | 2020-05-29 | 格特拉克（江西）传动系统有限公司 | Method for calculating and evaluating transmission squeaking sound in vehicle |
| CN112082757A (en) * | 2020-08-25 | 2020-12-15 | 格特拉克（江西）传动系统有限公司 | Gear surface evaluation method and device for gearbox |
Non-Patent Citations (1)
| Title |
|---|
| 王泽贵 等: "变速器啸叫声与下线台架振动的相关性试验研究", 《振动与冲击》 * |
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