CN113390653A - Wheel force transfer rate testing method and system - Google Patents
Wheel force transfer rate testing method and system Download PDFInfo
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- CN113390653A CN113390653A CN202110800898.0A CN202110800898A CN113390653A CN 113390653 A CN113390653 A CN 113390653A CN 202110800898 A CN202110800898 A CN 202110800898A CN 113390653 A CN113390653 A CN 113390653A
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- 238000012360 testing method Methods 0.000 title claims abstract description 44
- 238000012546 transfer Methods 0.000 title claims description 28
- 230000005284 excitation Effects 0.000 claims abstract description 49
- 230000001133 acceleration Effects 0.000 claims abstract description 35
- 230000005540 biological transmission Effects 0.000 claims abstract description 18
- 238000010998 test method Methods 0.000 claims abstract description 5
- 239000003292 glue Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052742 iron Inorganic materials 0.000 abstract description 5
- 239000000725 suspension Substances 0.000 abstract description 3
- 238000001228 spectrum Methods 0.000 description 8
- 238000004364 calculation method Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000005316 response function Methods 0.000 description 2
- BDEDPKFUFGCVCJ-UHFFFAOYSA-N 3,6-dihydroxy-8,8-dimethyl-1-oxo-3,4,7,9-tetrahydrocyclopenta[h]isochromene-5-carbaldehyde Chemical group O=C1OC(O)CC(C(C=O)=C2O)=C1C1=C2CC(C)(C)C1 BDEDPKFUFGCVCJ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000008569 process Effects 0.000 description 1
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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
- G01M17/013—Wheels
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Abstract
The invention discloses a method and a system for testing wheel force transmission rate, wherein the method comprises the steps of suspending a tire by an elastic rope; sensors are respectively arranged at the wheel center and the bottom end of the tire surface; connecting the sensors of the wheel center and the tire tread with a data acquisition system by using connecting wires respectively; connecting the data acquisition system with a computer by using a connecting wire; striking the wheel center excitation part by using an iron bar or a wrench or other common objects such as a human fist; the two sensors respectively pick up the vibration acceleration of the wheel center and the tire tread, and the vibration acceleration of the wheel center and the vibration acceleration of the tire tread are obtained through computer processing and display; the wheel force transmission rate can be obtained by calculating the ratio of the tire tread vibration acceleration to the wheel center vibration acceleration, the wheel force transmission rate test can be realized without using special excitation equipment, the wheel force transmission rate test procedure is simplified, test suspension and delay caused by the fault of the special excitation equipment can be avoided during the test, and the test reliability is effectively improved.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a wheel force transmission rate testing method and system.
Background
With the improvement of automobile technology and the improvement of consumer taste, the NVH performance (noise vibration comfort) of the automobile is increasingly emphasized by the consumers, so that the NVH performance of the automobile becomes an important index for measuring the quality of the automobile and has important significance in the development of the whole automobile. During the running of the automobile, the excitation force from the road surface can cause the wheel centers to generate vibration which is transmitted to the automobile body and the steering wheel through a suspension system and a steering system, and meanwhile, the vibration can excite the automobile body to generate structural noise, and the vibration and the noise can cause discomfort to passengers in the automobile. Therefore, the wheel with good vibration damping performance can well improve the riding comfort of passengers, and the wheel force transmission rate is the ratio of the wheel center output force to the tread input force and can be used as an index for evaluating the vibration damping performance of the wheel, so that the wheel force transmission rate is necessary to be tested.
The invention patent with the publication number of CN104344937A discloses a method for testing the vibration isolation performance of an automobile wheel, and the invention patents with the publication numbers of CN105510057A and CN105547715A respectively disclose a method and a device for testing the wheel force transfer function, wherein the method for testing the wheel force transfer function needs to be provided with special excitation equipment such as a modal force hammer, a vibration exciter and the like, the special excitation equipment is connected to a signal collector, the signal collector is used for collecting the magnitude of the instantaneous excitation force for exciting a sample in the excitation equipment, and the transfer function can be obtained by combining the vibration acceleration of a wheel center and a wheel surface, so that the wheel force transfer rate data can be obtained according to the transfer function; the special excitation equipment has higher purchase cost, and additionally occupies a channel of a data acquisition system when in use, so that the use cost is increased, and the modal force hammer, the vibration exciter and the like of the special excitation equipment used by the method are precise instruments, need to be electrified for use, and can not be used due to possible faults in a test, so that the test is delayed and stopped, and the test progress is delayed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method and a system for realizing the wheel force transfer rate test without using special excitation equipment, solve the problem of high cost caused by the fact that the special excitation equipment is required to be used in the existing wheel force transfer rate test, and simultaneously solve the problems of test delay, termination and test progress delay caused by the fact that the special excitation equipment fails to be used in the test.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a method of testing wheel force transmission comprising suspending a tire from a tire receiver; striking the excitation position of the wheel center to obtain a first vibration acceleration a at the wheel center1And a second vibration acceleration a at the tread2Calculating a second vibration acceleration a2And a first vibration acceleration a1The ratio of (a) to (b) yields a value for the wheel force transfer rate FT.
Further, the wheel force transfer rate is calculated by the formula
A wheel force transmissibility testing system for implementing the wheel force transmissibility testing method of claim, comprising a tire, a tire receiver, a plurality of sensors, a data acquisition system and a computer; the tire hangs on the tire accepting piece, and the sensor is installed on the tire, is connected through the connecting wire between sensor and the data acquisition system, is connected through the connecting wire between data acquisition system and the computer.
Further, the tire adapting piece is an elastic rope.
Further, the sensor is a vibration acceleration sensor.
Furthermore, the number of the sensors is two, and the sensors comprise a first sensor and a second sensor; the first sensor is arranged on the wheel center, and the second sensor is arranged at the bottom end of the tread corresponding to the midline of the tread; the first sensor is used for acquiring a first vibration acceleration a at the wheel center1A second sensor for acquiring a second vibration acceleration a at the tread2。
Further, the first sensor is installed on the wheel center through glue, and the second sensor is installed on the bottom end of the tire tread corresponding to the midline of the tire tread through glue.
Further, the tire includes a wheel center excitation site.
Further, the first sensor is arranged opposite to the excitation position of the wheel center along the diameter two ends of the wheel center.
The invention has the beneficial effects that:
the wheel force transmissibility test can be realized without using special excitation equipment, and the special excitation equipment is not required to be installed in the test process, so that the wheel force transmissibility test procedure is simplified, and the test is more convenient; meanwhile, the purchase cost of the excitation equipment is saved, resources occupied by a data acquisition channel of the special excitation equipment are saved, test suspension and delay caused by faults of the special excitation equipment can be avoided during testing, and the reliability of the test is effectively improved.
Drawings
FIG. 1 is a schematic representation of the wheel center excitation of the present invention using an iron rod impact.
FIG. 2 is a schematic view of the wheel center excitation position of the present invention using a wrench to impact the wheel center.
Figure 3 is a schematic diagram of the present invention illustrating a wheel center actuation using a human fist.
FIG. 4 is a comparison of test data without the use of a dedicated stimulus device and with a dedicated stimulus device in accordance with the present invention.
In the figure: the wheel comprises a wheel 1, an elastic rope 2, a sensor 3, a wheel center excitation part 4, an iron rod 5, a data acquisition system 6, a computer 7, a wrench 8 and a human fist 9.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described with reference to the accompanying drawings.
Wheel force transmission rate: the ratio of the output force of the wheel center to the input force of the tread is defined as
Is calculated by the formula
Wherein FWheel centerIs the wheel center output force, wherein FTreadIs the tread input force, H11As a wheel center-wheel center transfer function, H21Is the wheel center-tread transfer function.
Using force F1Exciting the wheel center, and measuring the vibration acceleration a of the wheel center by using a vibration acceleration sensor1And acceleration a of vibration of the tread2The transfer function can be calculated by a calculation formula of the transfer function.
Wherein
Is a1The self-power spectrum of (a) a,
is a2The self-power spectrum of (a) a,
is F1And a1The cross-power spectrum of (a) a,
is F1And a2Cross power spectra (above according to the formula p103 of frequency response function of 3.12 from "practical technique of modal testing: guide of practitioner" ISBN 978-7-11-63234-4 mechanical industry press). Wherein
Is directly measured by a vibration acceleration sensor,
must be measured using a modal force hammer or like actuation device. Therefore if a formula is used
To calculate FT, an excitation device such as a modal force hammer must be used.
The self-power spectrum and the cross-power spectrum can be further decomposed mathematically:
wherein
Is a1The frequency spectrum of (a) is,
is that
Conjugation of (1);
is a2The frequency spectrum of (a) is,
is that
Conjugation of (1);
is F1(the above is according to the formula p103 of frequency response function of 3.12 from "practical technique of modal testing: guide of practitioner" ISBN 978-7-11-63234-4 mechanical industry press).
since the real parts of the conjugate complex numbers are equal and the imaginary parts are opposite, according to the nature and algorithm of the complex numbers, it can be calculated that:
then:
therefore, if a formula is used
The FT is calculated, and the wheel force transmission rate can be obtained approximately without using special excitation equipment such as a modal force hammer and the likeAnd (7) FT. Fig. 4 shows test data, and it can be seen that the error between the wheel force transfer rate FT calculated without using the modal force hammer and the wheel force transfer rate FT calculated using the modal force hammer is only 0.01dB, which can completely meet the use requirement.
Therefore, when the wheel force transfer rate FT is calculated, the wheel center is hit and the vibration acceleration of the tread and the wheel center is measured without testing the transfer function and knowing the magnitude of the excitation force.
The invention discloses a wheel force transmission rate testing method, which comprises the following steps: as shown in fig. 1, the wheel 1 is suspended by using an elastic rope 2, the elastic rope 2 can be hung on a hook on a ceiling or other objects capable of bearing the elastic rope 2, as shown in fig. 1 to 3, a first sensor 3 is arranged at the wheel center of the wheel 1, a second sensor 3 is arranged at the bottom end of the tread corresponding to the tread center line, the sensor 3 is a vibration acceleration sensor, the sensor 3 is connected to a data acquisition system 6 through a connecting line, and the data acquisition system 6 is connected with a computer 7 through the connecting line.
The sensor 3 is glued at the centre of the wheel and at the bottom end of the tread in correspondence of the tread mid-line by means of a glue, for example 454 glue.
The sensor 3 at the wheel center is used to measure the vibration acceleration a at the wheel center when the excitation part 4 of the wheel center is hit1(ii) a The sensor 3 of the bottom end of the tread corresponding to the tread middle line is used for measuring the vibration acceleration a of the tread2。
Using any means such as: an iron rod 5 in FIG. 1, a wrench 8 in FIG. 2 or a human fist 9 in FIG. 3 and other common objects hit the wheel center excitation part 4, and vibration acceleration at the wheel center and the tire tread is picked up through a sensor 3; then the computer 7 calculates and displays the vibration acceleration a of the wheel center and the tread1And a2By passing
The wheel force transfer rate FT is calculated.
In the invention, as shown in fig. 1 to 3, the sensor 3 on the wheel center is adhered to the lower left corner of the wheel center through 454 glue, and the wheel center excitation part 4 is arranged at the upper right corner of the wheel center; the sensor 3 on the wheel center is separated from the wheel center excitation part 4 by a vehicle mark, and the sensor 3 on the wheel center is not contacted when the wheel center excitation part 4 is hit.
Figure 4 is a comparison of test data for a modal force hammer without the use of a dedicated excitation device and with a dedicated excitation device.
In the table of fig. 4, reference numeral 1 denotes wheel force transmission rate data FT obtained by striking the wheel center with an iron bar without using a special excitation device modal force hammer, and the calculation formula is a formula
The reference numeral 3 in the table of FIG. 4 is the tread vibration acceleration a obtained without using a dedicated excitation device2；
The number 4 in the table of FIG. 4 is the wheel center vibration acceleration a obtained without using a dedicated excitation device1；
When the special excitation equipment modal force hammer is used, the special excitation equipment modal force hammer needs to be connected into the data acquisition system 6 to acquire data
A value of (d); meanwhile, the vibration acceleration of the wheel center and the tire tread is obtained through a vibration acceleration sensor according to a formula
And formula
The transfer function H can be derived11And H21A value of (d); then by the formula
The value of the wheel force transfer rate data FT when using the dedicated excitation device can be derived.
The data in the table in fig. 4, through the computer 7 performing four arithmetic operations between the logarithmic function and the common number, it can be found from the wheel force transfer rate calculated in fig. 4 that the wheel force transfer rate data obtained without using the special excitation device is substantially consistent with the wheel force transfer rate data obtained by using the special excitation device modal hammer, the error is only 0.01dB, and the error can be substantially ignored in engineering, therefore, the test case comparatively proves the accuracy and reliability of the method of the present invention.
Finally, it should be noted that: while the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that various changes in the form and details may be made therein without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of testing the force transmission rate of a vehicle wheel, comprising suspending a tyre (1) from a tyre receiver; striking the excitation position of the wheel center to obtain a first vibration acceleration a at the wheel center1And a second vibration acceleration a at the tread2Calculating a second vibration acceleration a2And a first vibration acceleration a1The ratio of (a) to (b) yields a value for the wheel force transfer rate FT.
2. The wheel force transmission rate test method according to claim 1, wherein the wheel force transmission rate is calculated by the formula
3. A wheel force transmissibility testing system for implementing the wheel force transmissibility testing method of claim 1, characterized by comprising a tire (1), a tire receiver, a plurality of sensors (3), a data acquisition system (6), and a computer (7); the tire (1) is hung on the tire bearing piece, the sensor (3) is installed on the tire (1), the sensor (3) is connected with the data acquisition system (6) through a connecting line, and the data acquisition system (6) is connected with the computer (7) through a connecting line.
4. A wheel force transmissibility testing system according to claim 3, wherein said tire receiving member is an elastic cord (2).
5. A wheel force transmissibility testing system according to claim 3, characterized in that said sensor (3) is a vibration acceleration sensor.
6. The wheel force transmissibility testing system of claim 3, wherein said plurality of sensors (3) is two, including a first sensor (3) and a second sensor (3).
7. The wheel force transmissibility testing system of claim 6, wherein said first sensor (3) is mounted on the wheel center, and said second sensor (3) is mounted on the tread bottom end corresponding to the tread center line; the first sensor (3) is used for acquiring a first vibration acceleration a at the wheel center1A second sensor (3) for acquiring a second vibration acceleration a at the tread2。
8. The wheel force transmissibility testing system of claim 6, wherein said first sensor (3) is mounted on the wheel core by glue and said second sensor (3) is mounted on the tread bottom end corresponding to the tread centerline by glue.
9. A wheel force transmissibility testing system according to claim 3, wherein said tyre (1) comprises a wheel center excitation site (4).
10. The wheel force transmissibility testing system of claim 8 or 9, wherein said first sensor (3) is disposed opposite said wheel center excitation site (4) along a diameter of said wheel center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110800898.0A CN113390653A (en) | 2021-07-15 | 2021-07-15 | Wheel force transfer rate testing method and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110800898.0A CN113390653A (en) | 2021-07-15 | 2021-07-15 | Wheel force transfer rate testing method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114199593A (en) * | 2021-12-16 | 2022-03-18 | 东风汽车集团股份有限公司 | Device and method for measuring vibration sensitivity of tire rotation excitation to attachment point |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104344937A (en) * | 2013-07-24 | 2015-02-11 | 重庆长安汽车股份有限公司 | Automobile wheel vibration isolation performance test method |
| CN105510057A (en) * | 2016-01-25 | 2016-04-20 | 中国汽车技术研究中心 | Method and device for testing wheel force transfer function in free state |
| CN105547715A (en) * | 2016-01-25 | 2016-05-04 | 中国汽车技术研究中心 | Method and device for testing wheel force transfer function in finished automobile state |
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2021
- 2021-07-15 CN CN202110800898.0A patent/CN113390653A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104344937A (en) * | 2013-07-24 | 2015-02-11 | 重庆长安汽车股份有限公司 | Automobile wheel vibration isolation performance test method |
| CN105510057A (en) * | 2016-01-25 | 2016-04-20 | 中国汽车技术研究中心 | Method and device for testing wheel force transfer function in free state |
| CN105547715A (en) * | 2016-01-25 | 2016-05-04 | 中国汽车技术研究中心 | Method and device for testing wheel force transfer function in finished automobile state |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114199593A (en) * | 2021-12-16 | 2022-03-18 | 东风汽车集团股份有限公司 | Device and method for measuring vibration sensitivity of tire rotation excitation to attachment point |
| CN114199593B (en) * | 2021-12-16 | 2023-09-05 | 东风汽车集团股份有限公司 | Device and method for measuring vibration sensitivity from rotation excitation of tire to attachment point |
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