CN100462704C - Method for measuring type dynamic balance unbalance amount - Google Patents

Method for measuring type dynamic balance unbalance amount Download PDF

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Publication number
CN100462704C
CN100462704C CNB2004100238425A CN200410023842A CN100462704C CN 100462704 C CN100462704 C CN 100462704C CN B2004100238425 A CNB2004100238425 A CN B2004100238425A CN 200410023842 A CN200410023842 A CN 200410023842A CN 100462704 C CN100462704 C CN 100462704C
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unbalance
amount
tire
axis
detected tyre
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CN1673704A (en
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杭柏林
孟鹏
东野广俊
王金健
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Mesnac Co Ltd
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QINGDAO COLLEGES AND UNIVERSITIES SOFT CONTROL Co Ltd
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Abstract

The present invention is the measurement method of unbalance amount of tyre in dynamic balancing machine. During the measurement of static and dynamic unbalance amount of tyre with sensors, the linear mold of the corresponding relation between the unbalance amount in the calibrating plane and the sensor signals is established, so as to measuring static and dynamic unbalance amount of tyre accurately.

Description

The measuring method of tire dynamic and balance amount of unbalance
Technical field
The present invention relates to a kind of measuring method of tire dynamic and balance amount of unbalance.
Background technology
The quantity that present domestic unit and family buy automobile increases substantially, and has proposed requirements at the higher level for the quality standard in doughnut serviceable life.
Automobile tyre is the rotatable body of a kind of circular ring type of tubular section, and it is to be processed through applying, moulding, sulfuration typing by rubber preformed material, compounded rubber preformed material that multilayer has an all-steel cord.The tire of described structure, its constituent material exist skewness inevitably or mass centre does not overlap problems such as (so-called mass eccentricities) with the geometric center of tire, just the unbalance amount of tire of often saying.According to relevant mechanics principle, there is the to a certain degree tire of mass eccentricity, under the high speed rotating situation, must produce the radial force of alternation, thereby can cause the vibration or the noise of automobile, can have influence on speed, comfort level or the smoothness of automobilism.If the amount of unbalance of tire is bigger, serious also can the damage car parts, even can cause traffic hazard.
For the detection of unbalance amount of tire, be a necessary and crucial flow process in the existing tire production.As application number is 02106779, the patent that is used for measuring wheel tyre uniformity and/or dynamically balanced equipment and method, its equipment comprises that one is rotatably supported in one by the main shaft in the main shaft housing of non-yielding prop, described tire is fixedly mounted on the described main shaft, when measurement was carried out, described main shaft was rotated; And at least one is installed in the piezoelectric force transducer on the described main shaft housing, and when described main shaft rotated, described at least one piezoelectric force transducer detected the power that tyre rotation produces.
Pick-up unit and the method disclosed as above-mentioned patent, do not disclose and illustrate for the unbalance mass, of different kinds of tyre distribute and the sensor measured value between linear relationship; The also undeclared amount of unbalance of how measuring and identifying axis system itself is difficult to realize accurately reflecting the amount of unbalance of detected tyre.
Thereby for the accuracy that improves measuring wheel movement of the foetus, static-unbalance with set up the mathematical model of measuring method, lack regular the guidance, it is more to measure uncertain factor.Be reflected in the actual measurement process, just need at every turn amount of unbalance at different kinds of tyre to distribute to calculate the correct operation with the sensor measured value, otherwise the error of detection data be bigger.This must increase detection time and difficulty, thereby has influence on tire checking efficient, and its integral production cost also can correspondingly increase for tire production producer.
Summary of the invention
The measuring method of tire dynamic and balance amount of unbalance of the present invention, its purpose are intended to address the above problem with deficiency provides a kind of method that is used for measuring wheel movement of the foetus, static-unbalance.
The core content of described measuring method is that measuring method is applied to the amount of unbalance of the detected tyre on the dynamic balancer and measures.Adopt multisensor to carry out the dynamic and static amount of unbalance of tire when measuring, set up the value size of amount of unbalance on the correcting plane and the linear model of the corresponding relation of multiple sensor signals, thereby can measure the dynamic and static amount of unbalance of tire exactly.
After tire is retrofitted to dynamic balancer, comprise testing machine axis system, tire together, have a corresponding linear relationship between amount of unbalance on correcting plane up and down and the unbalanced couple amount that a plurality of sensors record, promptly be formed with the calibration coefficient of demarcation amount of unbalance.
The calibration coefficient of amount of unbalance is changeless for a certain testing machine.Therefore, calibration coefficient conversely, also can set up the linear corresponding relation of unbalanced couple amount measured value and the unbalance amount of tire of asking, thus can Tire Static, dynamically balanced amount of unbalance quantizes and calculate, thus offer the tire construction improvement with effective basis.
In the above-mentioned amount of unbalance of determining according to calibration coefficient, also include the amount of unbalance that testing machine axis system itself produces, the amount of unbalance of its axis system also is changeless for a certain testing machine equally.As long as the axis system amount of unbalance is identified and removes, can draw the value of amount of unbalance detected tyre, the process reduction.
As mentioned above, measuring method of the present invention is that the calibration coefficient determining used dynamic balance test machine is set at k1, k2, k3, k4; And n amount of unbalance measured value Mi of detected tyre and axis system (i=0,1 ..., n-1) carry out vector and calculate after, the amount of unbalance M of the axis system of determining.And based on this, sue for peace by vector and finally to calculate the unbalance mass, m of each concrete detected tyre at last rectifying plane s, and at the following unbalance mass, m of rectifying plane x
The measuring method of tire dynamic and balance amount of unbalance of the present invention, its main flow process is:
The first step is set up the linear relationship expression formula between detected tyre unbalance mass, and the testing machine force transducer measured value
m s = k 1 N s + k 2 N x m x = k 3 N s + k 4 N x - - - ( 1 )
Wherein: m sBe the unbalance mass, of rectifying plane on the detected tyre,
m xIt is the unbalance mass, of rectifying plane under the detected tyre;
K1, k2, k3, k4 are described scale transformation coefficient, i.e. calibration coefficient;
N sIt is the measured value of force transducer out-of-balance force on the testing machine;
N xIt is the measured value of force transducer out-of-balance force under the testing machine;
Second goes on foot, and determines calibration coefficient k1, k2, k3, the k4 numerical value of dynamic balancer;
Determine that described calibration coefficient includes,
Determine arbitrary detected tyre unbalance mass, m and survey the linear relationship between the out-of-balance force N; And, use the linear relationship between above-mentioned m and the N, install the identical counterweight of certain mass and fixed angle respectively additional and the actual out-of-balance force N that records calculates the concrete numerical value of calibration coefficient k1, k2, k3, k4 with the rotation of identical rotating speed by upper and lower rectifying plane at described dynamic balancer;
The 3rd step, the amount of unbalance of confirmed test main shaft system;
On definite calibration coefficient k1, k2, k3, k4 basis, arbitrary detected tyre is installed on the axis system and repeatedly by 180 ° of rotation detected tyres, with record form right amount of unbalance measured value Mi (i=0,1 ..., n-1);
After said n time measured value Mi being carried out vector and calculate, measure the amount of unbalance M of axis system by the amount of unbalance that balances out detected tyre 0(comprise the intrinsic unbalance mass, M of axis system at last rectifying plane S0, at the following intrinsic unbalance mass, M of rectifying plane X0
In the 4th step, carry out the amount of unbalance of measuring arbitrary detected tyre;
The tire of certain specification is placed on main measurement unit, is installed on the axis system and inflates, and select a certain rotating speed to be rotated from the scope of 200-1000rpm, the signal of lower sensor is N on the whole amount of unbalance correspondence of tire that records and axis system s, N xStop the rotation, unload gas and unload tire;
The whole amount of unbalance that solves tire and axis system according to above-mentioned second step and equation (1) is m SA, m XA
Amount of unbalance M with axis system S0, M X0With whole amount of unbalance be m SA, m XACarry out vector and, then the actual amount of unbalance of detected tyre, promptly
m S=m SA-M S0
m X=m XA-M X0
As mentioned above, promptly be the main flow content of measuring method of the present invention.
Demarcation flow process as above-mentioned described calibration coefficient of second step of flow process is:
Corresponding linear relationship between the first step, the centrifugal force of deriving upper and lower rectifying plane and force cell measured value.That is,
According to principle of moment balance, upper and lower rectifying plane asks the result of square to should be 0, thereby can set up arbitrary detected tyre at centrifugal force F that last rectifying plane produced s, respectively with the N of upper and lower force transducer measured value s, N xBetween the linear relationship expression formula; And, the centrifugal force F that arbitrary detected tyre is produced at following rectifying plane x, respectively with the N of upper and lower force transducer measured value s, N xBetween the linear relationship expression formula.
Second step is by the centrifugal force F of the upper and lower rectifying plane generation of detected tyre s, F xCalculate tire eccentric mass m.
In the 3rd step,, establish detected tyre unbalance mass, m and (comprise the unbalance mass, m that decomposes the upper and lower rectifying plane of detected tyre by tire eccentric mass m s, m x) and survey the linear relationship between the out-of-balance force N, (comprise N s, N x) between corresponding relation, i.e. calibration coefficient k1, k2, k3, k4.
As mentioned above, by calibration coefficient k1, k2, k3, k4, can determine detected tyre unbalance mass, m and survey the linear relationship between the out-of-balance force N.
Determine the numerical value of calibration coefficient k1, k2, k3, k4, can utilize the linear relationship between above-mentioned m and the N, by repeatedly last rectifying plane, down rectifying plane install additional certain mass, install the identical counterweight of angle additional, calculate with the actual out-of-balance force N that records of certain rotating speed.
Calibration coefficient k1, k2, k3, k4 numerical value is in case determine, can calculate and finally finishes its sign work at the amount of unbalance of axis system.
Measurement flow process as above-mentioned described axis system amount of unbalance of the 3rd step of flow process is:
The first step is got a standard tire and is placed on main measurement unit and is installed on the axis system, inflates;
By certain rotating speed rotary main shaft system, and the synthetic amount of unbalance that records axis system and detected tyre is M0, stops the rotation venting, last wheel rim rise;
Second the step, with tire on axis system, rotate 360 °/n (n=2,4,6 ..., n for the measurement number of times; Requiring n in theory is even number, practical application general n≤10); The operation of the repetition first step, last wheel rim descends, be installed tire and inflation, inner gas pressure remains unchanged; Obtain the synthetic amount of unbalance of axis system and detected tyre successively, until n time is measured;
The 3rd step, with the Mi as a result that measures for n time (i=0,1 ..., n-1) carry out vector and calculating, and after the scale transformation except that n.
The amount of unbalance of detected tyre is cancelled, and that then obtain is axis system amount of unbalance M 0, promptly
The measuring method of tire dynamic and balance amount of unbalance is to be based upon as above-mentioned equation (1) in sum
M 0 = Σ i = 0 n - 1 Mi n
The basis on, promptly be based upon on the basis of calibration coefficient k1, k2, k3, k4.Behind definite main shaft coefficient amount of unbalance, thereby it can be identified whole measurement coefficient has been found canonical reference system, because calibration coefficient and axis system amount of unbalance are changeless for dynamic balancer, thereby the amount of unbalance of measured detected tyre is accurately, not contain other amount of unbalances.
Use measuring method of the present invention, have measurement standard and reference frame reliably, the unbalanced data of measuring can directly instruct the tire construction correction and find out and cause reason of unbalanced, there is no uncertain factor.And in the actual measurement process, only need carry out the measuring and calculating of calibration coefficient and axis system amount of unbalance in advance, just can survey tire and calculate, thereby reduce detection time and difficulty effectively at each, the tire production detection efficiency is higher, and production cost also can correspondingly reduce.
Description of drawings
Fig. 1 is the primary structure synoptic diagram of dynamic balancer.
As shown in Figure 1, use axis system amount of unbalance measuring method of the present invention dynamic balancer, mainly include down wheel rim 1, last wheel rim 2, counterweight 3, last rectifying plane 4, tire 5, following rectifying plane 6, last wheel rim clamping body 7, last force transducer 8, main shaft supporting 9, following force transducer 10, rotary encoder 11.Wherein,
N sBe to go up the force transducer measured value,
N xForce transducer measured value under being,
A is two distances between the force transducer,
B is the distance that upper sensor arrives down the wheel rim lower surface,
C is the tread width (operating distance between just upper and lower wheel rim) of tire,
R is the radius of upper and lower rectifying plane (wheel rim).
Embodiment
Embodiment 1, in conjunction with dynamic balancer structure shown in Figure 1, measuring method of the present invention, after determining and dynamic balancer be in place, select arbitrary detected tyre with eccentric mass m, at first set up calibration coefficient k and detected tyre unbalance mass, m and survey the linear mathematic(al) representation between the rectifying plane unbalanced couple amount N, its linear model derivation is:
The first step as shown in Figure 1, according to principle of moment balance, is asked square respectively to upper and lower rectifying plane, and calculates the centrifugal force that the upper and lower rectifying plane of detected tyre produces.
Promptly last rectifying plane is asked square, its result should be 0, i.e. ∑ Ms=0.Solve:
F x = B + C C N s - A + B + C C N x - - - ( 2 )
Wherein, F xBe the centrifugal force that detected tyre decomposes down rectifying plane.
Again following rectifying plane is asked square, its result should be 0, i.e. ∑ Mx=0.Solve:
F s = A + B C N x - B C N s - - - ( 3 )
Wherein, F sBe the centrifugal force that detected tyre decomposes rectifying plane.
Second step decomposed the centrifugal force of upper and lower rectifying plane by detected tyre, had:
F=F s+F x (4)
Wherein, F is that eccentric mass m is the centrifugal force that r wheel rim place produces at radius.
Produce principle according to centrifugal force, can calculate the eccentric m of tire quality;
m=F/rω 2(5)
R is the radius of upper and lower correction,
ω is the angular velocity of tire rotation, is rotated counterclockwise moment for just, and right-handed moment is for bearing;
In the 3rd step,, establish the quality m that the detected tyre equivalence decomposes rectifying plane by tire eccentric mass m s, m xWith sensor survey out-of-balance force N s, N xBetween linear relationship, i.e. calibration coefficient k;
With above-mentioned equation (2), (3), (4), (5) formula simultaneous, set up the expression formula of following linear relationship
m s = k 1 N s + k 2 N x m x = k 3 N s + k 4 N x - - - ( 6 )
Wherein:
m sBe the unbalance mass, of rectifying plane on the detected tyre,
m xBe the unbalance mass, of rectifying plane under the detected tyre,
K1, k2, k3, k4 are described scale transformation coefficient, i.e. calibration coefficient.
By aforesaid linear model derivation, calibration coefficient k1, k2, k3, k4 are to determine constantly for specific concrete dynamic balance testing machine, and no matter how the unbalance mass, m of detected tyre changes.
Thereby, only need calculate calibration coefficient k1, k2, k3, k4, promptly the form of available numerical value gives expression to the unbalance mass, m of the upper and lower rectifying plane of detected tyre s, m x
Below be the idiographic flow of measuring and calculating calibration coefficient k1, k2, k3, k4:
The first step, the test value that detected tyre only is installed.
Detected tyre is installed between the upper and lower wheel rim, and selects a certain rotating speed to be rotated between 200-1000rpm, record the whole amount of unbalance of tire and axis system, the actual measurement of the corresponding upper and lower sensor of promptly whole amount of unbalance is N S0, N X0After recording above-mentioned measured value, promptly stop the rotation.
In second step, below colonel, add the test value behind the certain mass counterweight.
Add the counterweight that quality is m1 (being generally 50-200g) at last rectifying plane, the rotating speed of still going up step then is rotated, and records the tire and the whole amount of unbalance of axis system, i.e. the measured value N of corresponding upper and lower sensor that install additional behind the counterweight Ss, N XsAfter recording above-mentioned measured value, promptly stop the rotation.
According to aforesaid equation (6), can draw
k 1 ( N ss - N s 0 ) + k 2 ( N xs - N x 0 ) = m 1 k 3 ( N ss - N s 0 ) + K 4 ( N xs - N x 0 ) = 0 - - - ( 7 )
4 unknown quantity k1, k2, k3, k4 are arranged in the above-mentioned expression formula, still can not calculate occurrence, thereby also need get one group of numerical value again.
The 3rd step, the test value after below following school, adding the certain mass counterweight.
Taking off quality from last rectifying plane is that the counterweight of m1 is added in down on the same angle of rectifying plane, and the employing rotating speed rotation identical with the last step, records the tire and the whole amount of unbalance of axis system, i.e. the measured value N of corresponding upper and lower sensor that install additional behind the counterweight Sx, N XxAfter recording above-mentioned measured value, promptly stop the rotation.
Based on same principle,, can draw according to equation (6)
k 1 ( N sx - N s 0 ) + k 2 ( N xx - N x 0 ) = 0 k 3 ( N sx - N s 0 ) + K 4 ( N xx - N x 0 ) = m 1 - - - ( 8 )
In fact, N S0, N X0, N Ss, N Xs, N Sx, N Xx, m1 is given value, thereby can be with system of equations (7), (8) simultaneous,
If N Ss-N S0=T1, N Xs-N X0=T2, N Sx-N S0=T3, N Xx-N X0=T4, thus can solve:
k 1 = m 1 T 4 / ( T 1 T 4 - T 2 T 3 ) k 2 = m 1 T 3 / ( T 2 T 3 - T 1 T 4 ) k 3 = m 1 T 2 / ( T 2 T 3 - T 1 T 4 ) k 4 = m 1 T 1 / ( T 1 T 4 - T 2 T 3 )
Calibration coefficient k1, k2, k3, the k4 that tried to achieve this moment are actual measuring and calculating values.
Use above-mentioned dynamic balancer, all can pass through equation (6) for arbitrary detected tyre, and according to calibration coefficient k1, k2, k3, k4, and upper and lower force transducer measured value N s, N x, finally determine the unbalance mass, m of the upper and lower rectifying plane of detected tyre s, m x
Use above-mentioned calibration coefficient k1, k2, k3, the k4 that calculates, can calculate the whole amount of unbalance that comprises axis system and detected tyre by following flow process.Its measuring process is:
The first step is got a standard tire and is placed on main measurement unit and is installed on the axis system, inflates;
By certain rotating speed rotary main shaft system, and the synthetic amount of unbalance that records axis system and detected tyre is M0, stops the rotation venting, last wheel rim rise;
Second the step, with tire on axis system, rotate 360 °/n (n=2,4,6 ..., n is for measuring number of times; Requiring n in theory is even number, practical application general n≤10); The operation of the repetition first step, last wheel rim descends, be installed tire and inflation, inner gas pressure remains unchanged; Obtain the synthetic amount of unbalance of axis system and detected tyre successively, until n time is measured;
The 3rd the step, with n time the measurement Mi as a result (i=0,1 ..., n-1) carry out vector and calculating, and remove n after the scale transformation.
The amount of unbalance of detected tyre is cancelled, and that then obtain is axis system amount of unbalance M 0, promptly
M = Σ i = 0 n - 1 Mi n
As mentioned above, at definite calibration coefficient k1, k2, k3, k4 and axis system amount of unbalance M 0The basis on, can carry out the actual amount of unbalance of measuring arbitrary tire.Its flow process is:
The tire of certain specification is placed on main measurement unit, is installed on the axis system and inflates, and carry out the rotation of 200-1000rpm, the signal of lower sensor is N on the whole amount of unbalance correspondence of tire that records and axis system s, N xStop the rotation, unload gas and unload tire;
The whole amount of unbalance that solves tire and axis system according to above-mentioned second step and equation (1) is m SA, m XA
Amount of unbalance M with axis system S0, M X0With whole amount of unbalance be m SA, m XACarry out vector and, then the actual amount of unbalance of detected tyre, promptly
m S=m SA-M S0
m X=m XA-M X0

Claims (4)

1. the measuring method of a tire dynamic and balance amount of unbalance is characterized in that: the calibration coefficient determining institute's using tyre dynamic balancer is set at k1, k2, k3, k4; And n amount of unbalance measured value Mi of detected tyre and axis system, i=0,1 ..., n-1, after carrying out vector and calculating, the amount of unbalance M of the axis system of determining; On the basis of determining above-mentioned calibration coefficient and axis system amount of unbalance, sue for peace by vector and finally to calculate arbitrary concrete detected tyre and decompose unbalance mass, m at last rectifying plane s, and decompose at the unbalance mass, m of rectifying plane down x, the flow process of described measuring method is,
The first step is set up the linear relationship expression formula between detected tyre unbalance mass, and the testing machine force transducer measured value
m s = k 1 N s + k 2 N x m x = k 3 N s + k 4 N x - - - ( 1 )
Wherein: m sBe the unbalance mass, of rectifying plane on the detected tyre,
m xIt is the unbalance mass, of rectifying plane under the detected tyre;
K1, k2, k3, k4 are described scale transformation coefficient, i.e. calibration coefficient;
N sIt is the measured value of force transducer out-of-balance force on the testing machine;
N xIt is the measured value of force transducer out-of-balance force under the testing machine;
Second goes on foot, and determines calibration coefficient k1, k2, k3, the k4 numerical value of dynamic balancer;
Determine that described calibration coefficient includes,
Determine arbitrary detected tyre unbalance mass, m and survey the linear relationship between the out-of-balance force N; And,
Use the linear relationship between above-mentioned m and the N, install the identical counterweight of certain mass and fixed angle respectively additional and the actual out-of-balance force N that records calculates the concrete numerical value of calibration coefficient k1, k2, k3, k4 with the rotation of identical rotating speed by upper and lower rectifying plane at described dynamic balancer;
The 3rd step, the amount of unbalance of confirmed test main shaft system;
On definite calibration coefficient k1, k2, k3, k4 basis, arbitrary detected tyre is installed on the axis system and repeatedly by 180 ° of rotation detected tyres, recording the right amount of unbalance measured value Mi that form more, i=0,1 ..., n-1;
After said n time measured value Mi being carried out vector and calculate, measure the amount of unbalance M of axis system by the amount of unbalance that balances out detected tyre 0, comprise the intrinsic unbalance mass, M of axis system at last rectifying plane S0, at the following intrinsic unbalance mass, M of rectifying plane X0
In the 4th step, carry out the amount of unbalance of measuring arbitrary detected tyre;
The tire of certain specification is placed on main measurement unit, is installed on the axis system and inflates, and carry out the rotation of 200-1000rpm, the signal of lower sensor is N on the whole amount of unbalance correspondence of tire that records and axis system s, N xStop the rotation, unload gas and unload tire;
The whole amount of unbalance that solves tire and axis system according to above-mentioned second step and equation (1) is m SA, m XA
Amount of unbalance M with axis system S0, M X0With whole amount of unbalance be m SA, m XACarry out vector and, then the actual amount of unbalance of detected tyre, promptly
m S=m SA-M S0
m X=m XA-M X0
2. the measuring method of tire dynamic and balance amount of unbalance according to claim 1 is characterized in that: set up the unbalance mass, of arbitrary detected tyre in the described measuring method, and the flow process of the linear relationship between the testing machine force transducer measured value is,
The first step according to principle of moment balance, is asked square respectively to upper and lower rectifying plane, and calculates the centrifugal force that the upper and lower rectifying plane of detected tyre produces;
Promptly last rectifying plane is asked square, its result should be 0, i.e. ∑ Ms=0; Solve:
F x = B + C C N s - A + B + C C N x - - - ( 2 )
Wherein, F xBe the centrifugal force that detected tyre decomposes down rectifying plane,
A is two distances between the force transducer,
B is the distance that upper sensor arrives down the wheel rim lower surface,
C is the tread width of tire, the operating distance between just upper and lower wheel rim;
Again following rectifying plane is asked square, its result should be 0, i.e. ∑ Mx=0 solves:
F s = A + B C N x - B C N s - - - ( 3 )
Wherein, F sBe the centrifugal force that detected tyre decomposes rectifying plane;
Second step decomposed the centrifugal force of upper and lower rectifying plane by detected tyre, had:
F=F s+F x (4)
Wherein, F is that eccentric mass m is the centrifugal force that r wheel rim place produces at radius,
Produce principle according to centrifugal force, can calculate the eccentric m of tire quality;
m=F/rω 2 (5)
R is the radius of upper and lower correction,
ω is the angular velocity of tire rotation, is rotated counterclockwise moment for just, and right-handed moment is for bearing;
In the 3rd step,, establish the quality m that the detected tyre equivalence decomposes rectifying plane by tire eccentric mass m s, m xWith sensor survey out-of-balance force N s, N xBetween linear relationship, i.e. calibration coefficient k;
With above-mentioned equation (2), (3), (4), (5) formula simultaneous, set up the expression formula of following linear relationship
m s = k 1 N s + k 2 N x m x = k 3 N s + k 4 N x - - - ( 6 )
Wherein:
m sBe the unbalance mass, of rectifying plane on the detected tyre,
m xBe the unbalance mass, of rectifying plane under the detected tyre,
K1, k2, k3, k4 are described scale transformation coefficient, i.e. calibration coefficient.
3. the measuring method of tire dynamic and balance amount of unbalance according to claim 2 is characterized in that: the flow process of definite calibration coefficient k1, k2, k3, k4 is in the described measuring method,
The first step, the test value that detected tyre only is installed;
Detected tyre is installed between the upper and lower wheel rim, and in the scope of 200-1000rpm, selects a certain rotating speed to be rotated, record the whole amount of unbalance of tire and axis system, the measured value N of the corresponding upper and lower sensor of promptly whole amount of unbalance S0, N X0After recording above-mentioned measured value, promptly stop the rotation;
In second step, below colonel, add the test value behind the certain mass counterweight;
Adding quality at last rectifying plane is m1, is the counterweight of 50-200g, and the frequency 200-1000rpm that still goes up step then is rotated, and records the tire and the whole amount of unbalance of axis system, i.e. the measured value N of corresponding upper and lower sensor that install additional behind the counterweight Ss, N XsAfter recording above-mentioned measured value, promptly stop the rotation,
According to aforesaid equation (4), draw
k 1 ( N ss - N s 0 ) + k 2 ( N xs - N x 0 ) = m 1 k 3 ( N ss - N s 0 ) + k 4 ( N xs - N x 0 ) = 0 - - - ( 7 )
The 3rd step, the test value after below following school, adding the certain mass counterweight;
Taking off quality from last rectifying plane is that the counterweight of m1 is added in down rectifying plane, and the employing rotation identical with the last step, records the tire and the whole amount of unbalance of axis system, i.e. the measured value N of corresponding upper and lower sensor that install additional behind the counterweight Sx, N XxAfter recording above-mentioned measured value, promptly stop the rotation;
Based on same principle,, draw according to equation (4)
k 1 ( N sx - N s 0 ) + k 2 ( N xx - N x 0 ) = 0 k 3 ( N sx - N s 0 ) + k 4 ( N xx - N x 0 ) = m 1 - - - ( 8 )
In fact, N S0, N X0, N Ss, N Xs, N Sx, N Xx, m1 is given value, thereby can be with system of equations (7), (8) simultaneous,
If N Ss-N S0=T1, N Xs-N X0=T2, N Sx-N S0=T3, N Xx-N X0=T4, thus can solve
k 1 = m 1 T 4 / ( T 1 T 4 - T 2 T 3 ) k 2 = m 1 T 3 / ( T 2 T 3 - T 1 T 4 ) k 3 = m 1 T 2 / ( T 2 T 3 - T 1 T 4 ) k 4 = m 1 T 1 / ( T 1 T 4 - T 2 T 3 ) .
4. the measuring method of tire dynamic and balance amount of unbalance according to claim 3 is characterized in that: the flow process of definite axis system amount of unbalance is in the described measuring method,
The first step is got a standard tire and is placed on main measurement unit and is installed on the axis system, inflates;
By certain rotating speed rotary main shaft system, and the synthetic amount of unbalance that records axis system and detected tyre is M 0, stop the rotation, venting, last wheel rim rises;
Second step, tire is rotated 360 °/n on axis system, n=2,4,6 ..., n is for measuring number of times; N is an even number, n≤10; The operation of the repetition first step, last wheel rim descends, be installed tire and inflation, inner gas pressure remains unchanged; Obtain the synthetic amount of unbalance of axis system and detected tyre successively, until n time is measured;
The 3rd step, with the Mi as a result of n measurement, i=0,1 ..., n-1 carries out vector and calculating, and removes n after the scale transformation;
The amount of unbalance of detected tyre is cancelled, and that then obtain is axis system amount of unbalance M 0, promptly
M = Σ i = 0 n - 1 Mi n .
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