CN101750196A - Method for detecting static rigidity of light passenger car body - Google Patents
Method for detecting static rigidity of light passenger car body Download PDFInfo
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- CN101750196A CN101750196A CN200910264011A CN200910264011A CN101750196A CN 101750196 A CN101750196 A CN 101750196A CN 200910264011 A CN200910264011 A CN 200910264011A CN 200910264011 A CN200910264011 A CN 200910264011A CN 101750196 A CN101750196 A CN 101750196A
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Abstract
The invention relates to a static rigidity detection method, in particular to a method for detecting static rigidity of a light passenger car body, which comprises the following steps: applying a certain torque to the front part of the passenger car body by utilizing a lever, acquiring displacement deformations at two longitudinal beams of the passenger car body, calculating a torsional angle of the passenger body and calculating the slope f a fitting straight line according to the results of opposite torsional angles between a front axle and a rear axle of the passenger car body to obtain the torsional rigidity of the passenger car body; then, applying a certain bending moment to the middle part of the passenger car body by utilizing the lever or a weight, acquiring displacement deformations at the two longitudinal beams of the passenger car body, calculating the bending rigidity of the passenger car body according to maximal applying force and maximal deformation; finally, describing a torsional and bending curve by utilizing the data of the torsional and bending displacement deformations of the passenger car body and judging whether the partial performance of the passenger car body is proper according to the curve. The invention not only can obtain the static rigidity value of the passenger car body, but also can validate the accuracy of CAE analysis results and detect the result accuracy, thereby having higher reliability.
Description
Technical field
The present invention relates to a kind of method for detecting static rigidity, a kind of specifically method for detecting static rigidity of light passenger car body.
Background technology
At present, the quiet rigidity detection system of vehicle body only is confined to coachbuilt body, and the quiet rigidity value of bus body still need be by means of Computer Analysis, and its result's confidence level still is subjected to bigger query, cause its as a result utilizability reduce greatly, be unfavorable for solving with the relevant vehicle performance problem of vehicle body.
Summary of the invention
Technical matters to be solved by this invention is: at the shortcoming of above prior art existence, a kind of method for detecting static rigidity of light passenger car body is proposed, can not only obtain the quiet rigidity value of vehicle body, and can verify cae analysis result's accuracy, testing result accuracy and confidence level are higher.
The technical scheme that the present invention solves above technical matters is:
Method for detecting static rigidity of light passenger car body comprises displacement transducer, force transducer, counterweight and lever, may further comprise the steps:
(1) utilizes lever that body forward structure is applied certain moment of torsion, gather the displacement deformation amount at vehicle body two longeron places, calculate the vehicle body torsional angle,, calculate the slope of fitting a straight line, draw body torsional rigdity according to relative torsional angle between the vehicle body antero posterior axis;
(2) utilize lever or counterweight that vehicle body middle part is applied certain bending moment, gather the displacement deformation amount at vehicle body two longeron places, apply power and the maximum displacement deflection calculates the vehicle body bending stiffness according to maximum;
(3) utilize vehicle body to reverse and describe torsional rigidity and bending stiffness curve, judge according to curve whether the local performance of vehicle body is suitable with bending displacement deflection data.
The arrangement principle of displacement sensor and force transducer is that the corresponding longeron of antero posterior axis place must arrange that other measuring points 300～400mm are at interval arranged one.
In the step (1), the moment of torsion loading position is positioned at the front axle both sides, and the torque maximal value is 4000N.m, and starting point is 1000N.m, increases progressively 1000N.m at every turn, divides 4 loadings to finish.In the step (2), the moment of flexure loading position is positioned at the antero posterior axis centre position, and magnitude of load is 1/2 of a vehicular gross combined weight.
Advantage of the present invention is: detection method of the present invention not only simply but also reliable, just can be implemented the static rigidity of light passenger car body test very easily, and its testing result accuracy and confidence level are higher.The present invention can not only obtain the quiet rigidity value of vehicle body, and can verify cae analysis result's accuracy.
Description of drawings
Fig. 1 is that torsional rigidity of the present invention detects synoptic diagram.
Fig. 2 is that bending stiffness of the present invention detects synoptic diagram.
Fig. 3 is bending stiffness data processing principle figure.
Embodiment
Embodiment one
Torsional rigidity:
Torsional rigidity synoptic diagram such as Fig. 1, testing table is made up of vehicle body, bending stiffness platform, vehicle body support, crosswise fixed bar, displacement transducer, force transducer.Vehicle body front axle the way of restraint: the displacement of constraint front axle z direction, discharge x, y, the z direction is rotated, vehicle body rear axle the way of restraint: constraint rear axle x, y, the displacement of z direction discharges x, y, the z direction is rotated; The way of restraint is realized by ball pivot.Guarantee chassis runner level all around during test, displacement sensor and force transducer arrangement principle are that the corresponding longeron of antero posterior axis place (about two longerons) must arrange, other measuring points are arranged according to vehicle body total length and body structure, general 300～400mm at interval arranges a point, vehicle body is paid close attention to the position and need be arranged measuring point in addition, and the precision of displacement transducer device is not less than 0.01mm.Reverse loading position and be positioned at the front axle both sides, torque is according to body structure and purposes decision, and maximal value is about 4000N.m, and starting point is 1000N.m, increases progressively 1000N.m at every turn, divides 4 steps to load and finishes.Before the official test, need carry out 2 prestrain to vehicle body, purpose is to eliminate the fit-up gap error.The test figure collection should load in load to be carried out after finishing in 2 minutes, guaranteed data stability.
The displacement transducer position is the vehicle body left-right longeron, and arrangement is for being symmetrically arranged.
Load mode is the left-right symmetric vertical loading, about respectively carry out the loaded cycle of 3 1000～4000N.m.
Data processing: to about each data of 3 times carry out arithmetic mean respectively, to the vertical deformation amount of deserved longeron and 2 spacing, calculate each cross section windup-degree of 1000～4000N.m vehicle body according to the sensor that is symmetrically arranged.Torsional rigidity=loading moment/front and back hang relative torsional angle.Retouch out 4 points according to 1000～4000N.m loading moment with the value of the outstanding relative torsional angle in front and back, make straight line (Y=kX+b) by these 4 then, the slope k of this straight line is the torsional rigidity value, and wherein the outstanding relative torsional angle in front and back refers to the difference of forward and backward outstanding torsional angle.The rear overhang torsional angle should be zero in theory, and in actual tests because test fixture and tie point place are not absolute rigidity, can produce certain microdeformation, produce a torsional angle, need cut.The outstanding torsional angle in front and back is calculated by outstanding place, front and back longeron vertical deformation amount.
Utilize the torsional angle result who calculates, draw the vehicle body torsion curve, as line smoothing, then body torsional rigdity is linear, and promptly the local performance of vehicle body is suitable.
Bending stiffness:
Bending stiffness synoptic diagram such as Fig. 2, test-bed is made up of vehicle body, bending stiffness platform, vehicle body support, displacement transducer, force transducer.Vehicle body front axle the way of restraint: constraint front axle y, the displacement of z direction discharges x, y, the z direction is rotated and the displacement of x direction, vehicle body rear axle the way of restraint: constraint rear axle x, y, the displacement of z direction discharges x, y, the z direction is rotated; The way of restraint is realized by ball pivot.Guarantee chassis runner level all around during test, the transducer arrangements principle is that the corresponding longeron of antero posterior axis place (about two longerons) must arrange, other measuring points are arranged according to vehicle body total length and body structure, general 300～400mm at interval arranges a point, vehicle body is paid close attention to the position and need be arranged measuring point in addition, and the precision of displacement transducer device is not less than 0.01mm.Loading position is positioned at the antero posterior axis centre position, and magnitude of load determines according to vehicular gross combined weight, is 1/2 of vehicular gross combined weight, before the official test, need carry out 2 prestrain to vehicle body, and purpose is to eliminate the fit-up gap error.The test figure collection should load in load to be carried out after finishing in 2 minutes, guaranteed data stability.
The displacement transducer position is the vehicle body left-right longeron, and arrangement is for being symmetrically arranged.
Load mode is a vertical loading.
Data processing: left-right symmetric displacement transducer test bit is carried out arithmetic mean, the processing of making zero of antero posterior axis place racking test numerical value, concrete grammar is: set the vehicle body flexural property for linear, utilize the displacement deformation amount at antero posterior axis place to obtain the influence of other measuring point displacement volume productions being given birth to, its schematic diagram such as Fig. 3 because of antero posterior axis place displacement deformation amount.
Among Fig. 3: a1, a6 are respectively the corresponding longeron of antero posterior axis place deflection, a0, a2, a3, a4, a5, a7 are respectively other measuring points of longeron need elimination because of the distortion of antero posterior axis place the amount of influence, b1, b2, b3, b4, b5, b6, b7 are each measuring point spacing, their numerical value equates that b0 is the distance of antero posterior axis line intersection point to the a0 measuring point.
Actual displacement amount=the test value of other measuring points-measured by the influence of antero posterior axis.
Vehicle body bending stiffness=F/ Δ Z
Wherein: the F-maximum load;
The maximum distortion of Δ Z-longeron on the Z direction.
Utilize the arithmetic mean of left-right symmetric displacement transducer test bit to draw the vehicle body buckling curve, horizontal ordinate is displacement transducer position (length of wagon), and ordinate is the displacement deformation amount.As the curve smoother, this vehicle body bending stiffness linearity then, promptly the local performance of vehicle body is suitable.
The present invention can also have other embodiment, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of protection of present invention.
Claims (4)
1. method for detecting static rigidity of light passenger car body comprises displacement transducer, force transducer, counterweight and lever, it is characterized in that: may further comprise the steps:
(1) utilizes lever that body forward structure is applied certain moment of torsion, gather the displacement deformation amount at vehicle body two longeron places, calculate the vehicle body torsional angle,, calculate the slope of fitting a straight line, draw body torsional rigdity according to relative torsional angle between the vehicle body antero posterior axis;
(2) utilize lever or counterweight that vehicle body middle part is applied certain bending moment, gather the displacement deformation amount at vehicle body two longeron places, apply power and the maximum displacement deflection calculates the vehicle body bending stiffness according to maximum;
(3) utilize vehicle body to reverse and describe torsional rigidity and bending stiffness curve, judge according to curve whether the local performance of vehicle body is suitable with bending displacement deflection data.
2. method for detecting static rigidity of light passenger car body as claimed in claim 1 is characterized in that: the arrangement principle of described displacement sensor and force transducer is that the corresponding longeron of antero posterior axis place must arrange that other measuring points 300～400mm are at interval arranged one.
3. method for detecting static rigidity of light passenger car body as claimed in claim 1 is characterized in that: in the described step (1), the moment of torsion loading position is positioned at the front axle both sides, the torque maximal value is 4000N.m, starting point is 1000N.m, increases progressively 1000N.m at every turn, divides 4 loadings to finish.
4. method for detecting static rigidity of light passenger car body as claimed in claim 1 is characterized in that: in the described step (2), the moment of flexure loading position is positioned at the antero posterior axis centre position, and magnitude of load is 1/2 of a vehicular gross combined weight.
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| CN200910264011A CN101750196A (en) | 2009-12-29 | 2009-12-29 | Method for detecting static rigidity of light passenger car body |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018024A (en) * | 2012-12-03 | 2013-04-03 | 奇瑞汽车股份有限公司 | Method for evaluating torsional rigidity |
| CN107292011A (en) * | 2017-06-14 | 2017-10-24 | 奇瑞汽车股份有限公司 | Determine the method and device of the Static stiffness of vehicle body tie point |
| CN108627310A (en) * | 2018-04-25 | 2018-10-09 | 江铃控股有限公司 | Automobile body-in-white entirety Static stiffness test method |
| CN111157200A (en) * | 2017-01-25 | 2020-05-15 | 松下知识产权经营株式会社 | Rigidity measuring device and rigidity measuring method |
| CN111551363A (en) * | 2020-05-21 | 2020-08-18 | 青岛理工大学 | System and method for measuring friction of gear transmission tooth surface |
| CN111999017A (en) * | 2019-05-07 | 2020-11-27 | 东风汽车集团有限公司 | Vehicle body rigidity test system and method |
| CN112504693A (en) * | 2020-11-25 | 2021-03-16 | 东风柳州汽车有限公司 | Static rigidity test device for body-in-white structure |
| CN113375946A (en) * | 2021-05-28 | 2021-09-10 | 安徽江淮汽车集团股份有限公司 | Vehicle body dynamic torsion and bending test method and device |
-
2009
- 2009-12-29 CN CN200910264011A patent/CN101750196A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018024A (en) * | 2012-12-03 | 2013-04-03 | 奇瑞汽车股份有限公司 | Method for evaluating torsional rigidity |
| CN111157200A (en) * | 2017-01-25 | 2020-05-15 | 松下知识产权经营株式会社 | Rigidity measuring device and rigidity measuring method |
| CN107292011A (en) * | 2017-06-14 | 2017-10-24 | 奇瑞汽车股份有限公司 | Determine the method and device of the Static stiffness of vehicle body tie point |
| CN108627310A (en) * | 2018-04-25 | 2018-10-09 | 江铃控股有限公司 | Automobile body-in-white entirety Static stiffness test method |
| CN111999017A (en) * | 2019-05-07 | 2020-11-27 | 东风汽车集团有限公司 | Vehicle body rigidity test system and method |
| CN111999017B (en) * | 2019-05-07 | 2022-03-29 | 东风汽车集团有限公司 | Vehicle body rigidity test system and method |
| CN111551363A (en) * | 2020-05-21 | 2020-08-18 | 青岛理工大学 | System and method for measuring friction of gear transmission tooth surface |
| CN111551363B (en) * | 2020-05-21 | 2022-09-20 | 青岛理工大学 | System and method for measuring friction of gear transmission tooth surface |
| CN112504693A (en) * | 2020-11-25 | 2021-03-16 | 东风柳州汽车有限公司 | Static rigidity test device for body-in-white structure |
| CN112504693B (en) * | 2020-11-25 | 2023-01-24 | 东风柳州汽车有限公司 | Static rigidity test device for body-in-white structure |
| CN113375946A (en) * | 2021-05-28 | 2021-09-10 | 安徽江淮汽车集团股份有限公司 | Vehicle body dynamic torsion and bending test method and device |
| CN113375946B (en) * | 2021-05-28 | 2024-04-26 | 安徽江淮汽车集团股份有限公司 | Method and device for testing dynamic torsion and bending of vehicle body |
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Open date: 20100623 |