CN112326119A - Vehicle mass center height measuring device and method - Google Patents
Vehicle mass center height measuring device and method Download PDFInfo
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- CN112326119A CN112326119A CN202011193459.XA CN202011193459A CN112326119A CN 112326119 A CN112326119 A CN 112326119A CN 202011193459 A CN202011193459 A CN 202011193459A CN 112326119 A CN112326119 A CN 112326119A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000000725 suspension Substances 0.000 claims abstract description 15
- 238000005303 weighing Methods 0.000 claims abstract description 15
- 239000006096 absorbing agent Substances 0.000 claims abstract description 10
- 230000035939 shock Effects 0.000 claims abstract description 10
- 230000005489 elastic deformation Effects 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims description 16
- 238000005259 measurement Methods 0.000 claims description 4
- 239000000295 fuel oil Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 15
- 238000012938 design process Methods 0.000 abstract description 6
- 238000012546 transfer Methods 0.000 description 6
- 206010034719 Personality change Diseases 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010959 steel Substances 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
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/12—Static balancing; Determining position of centre of gravity
- G01M1/122—Determining position of centre of gravity
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Abstract
The invention discloses a vehicle mass center height measuring device and a method, wherein the vehicle mass center height measuring device comprises a fixed supporting column, a movable supporting column, a weighing disc and an attitude control clamping block, wherein: the fixed supporting columns are used for supporting rear wheels of a vehicle to be measured, the weighing disc is fixed on the fixed supporting columns, and the weighing disc is in signal connection with a display; the movable supporting column can reciprocate along the axis direction and is used for supporting the front wheel of the vehicle to be tested; the attitude control clamping block is arranged on a shock absorber of the vehicle to be tested so as to resist elastic deformation of a suspension. Compared with the prior art, the attitude accuracy test is realized, the calculation performance accuracy in the vehicle design process is improved, the guarantee is provided for the calculation of the braking stability, the operation stability, the smoothness performance and the like, and meanwhile, the influence of the elastic deformation of the suspension when the suspension is stressed on the height of the centroid is eliminated.
Description
Technical Field
The invention relates to the technical field of vehicle mass center measurement, in particular to a vehicle mass center height measuring device and method.
Background
The automobile mass center height is an important parameter in the automobile design process, and has important influence on the stability and smoothness performance and the braking safety, the mass center position of the whole automobile is usually calculated according to the mass center position of each assembly in the design process, but due to the processing and assembly reasons, the calculated mass center position and the actual position have larger errors, and the problem that the mass center position cannot be accurately obtained is important in the automobile design process.
The automobile mass center is the inherent attribute of an automobile, but can change due to changes of tire air pressure, suspension stiffness and axle load transfer, and the mass center height can influence the axle load transfer amount after the automobile attitude changes, so that the mass center height position is judged according to the axle load transfer amount, but the changed axle load can influence the tire deformation and can also cause the compression deformation of a suspension spring, the changes can further aggravate the axle load transfer, and the test process of the mass center height is difficult. Although the existing method also utilizes the axle load transfer after the automobile attitude changes to calculate the height of the mass center, the influence of the attitude change caused by tire deformation and suspension compression deformation on the height of the mass center is not considered, so that the tested data cannot reflect the actual height of the mass center and has certain influence on design calculation.
Fig. 1 is a schematic diagram of a conventional centroid height test, and its main structure includes the following parts: two stands lift test bench about, but divide into four and all can weigh, the side lift realization change of heeling about during the experiment, it can to record left and right side weight change and test bench heeling angle down, the principle of mainly utilizing is as follows: the axle load is changed after the vehicle rolls, the change is determined by the height of the mass center, the height of the mass center in the no-load state is inherent and unchanged, the roll angle of the test bed is equivalent to the roll angle of the vehicle body, the tire is considered to be not deformed, and therefore the height value of the mass center can be obtained through calculation.
The above method has the following drawbacks:
A) in the prior art, a roll angle value is obtained mainly through roll change of left and right sides, and the vehicle deflection angle is considered to be the same as the roll angle value, but after roll, the axle load can be changed, the axle load of a single side can be increased, at the moment, the spring of the side is further compressed and deformed, the spring of the other side can be stretched and deformed, the roll angle of the vehicle body can be changed, and the changed roll angle value can also cause further weight transfer;
B) when the left side and the right side are inclined, the front wheel track and the rear wheel track are basically not required to be the same, but only one value is taken to influence the final calculation precision during calculation, the left side and the right side are inclined, and the tires are compressed to deform, and the mechanism is basically the same as that of a suspension spring;
C) when the left side and the right side are inclined, the lifting height cannot be too large, otherwise, the vehicle is relatively unstable and is easy to sideslip, and meanwhile, the tire is subjected to large lateral force and generates lateral deformation, which also influences the test result.
Disclosure of Invention
The invention aims to provide a vehicle mass center height measuring device and a vehicle mass center height measuring method, which aim to solve the technical problems in the prior art.
The invention provides a vehicle mass center height measuring device, which comprises a fixed supporting column, a movable supporting column, a weighing disc and an attitude control clamping block, wherein:
the fixed supporting columns are used for supporting rear wheels of a vehicle to be measured, the weighing disc is fixed on the fixed supporting columns, and the weighing disc is in signal connection with a display;
the movable supporting column can reciprocate along the axis direction and is used for supporting the front wheel of the vehicle to be tested;
the attitude control clamping block is arranged on a shock absorber of the vehicle to be tested so as to resist elastic deformation of a suspension.
A vehicle centroid height measuring apparatus as defined above wherein preferably said fixed support post is fixed to a slide platform, said slide platform being horizontally movable to move closer to or away from said movable support post.
The vehicle centroid height measuring device as above, wherein preferably, an anti-rolling block is fixed on the top end of the movable support column, an anti-rolling groove is concavely arranged on the top surface of the anti-rolling block, and the inner diameter of the anti-rolling groove is adapted to the outer diameter of the front wheel of the vehicle to be measured.
The vehicle centroid height measuring device as described above, wherein preferably said attitude control clamp block comprises two symmetrically arranged single-side clamp blocks, said single-side clamp blocks are C-shaped.
The invention also provides a method for measuring the height of the mass center of the vehicle, which comprises the following steps:
(1) confirming the vehicle state, filling fuel oil according to 90% of the volume of an oil tank, wherein the vehicle to be tested comprises a spare tire and a vehicle-mounted tool, and the air pressure of the tire is set to be 3.0 bar;
(2) measuring in a state of servicing quality, recording the load of each wheel, and measuring the height required by the attitude control clamping block;
(3) manually adding a front and rear attitude control clamp block by using a vehicle jacking device;
(4) lifting the front axle or the rear axle, wherein the front wheel and the rear wheel must ensure that at least one axle is in a free state when lifting;
the calculation formula of the height of the mass center is as follows, and multiple measurements are averaged;
hS＝L/m*△m/hB*(L2-hB 2)1/2+rdyn
wherein: h isS: height of center of mass, L: wheelbase, m: weight of the entire vehicle, hB: lifting height of movable support column, load change of delta m axis, rdynThe tire load radius.
Compared with the prior art, the invention adopts the structure of additionally installing the attitude limiting block, avoids the influence of attitude change caused by axle load change on the height of the center of mass, increases the tire air pressure, can calculate only by measuring the front lifting height and the rear axle load change, is convenient and quick, can be operated by one person, is easy to modify the test bench by a common unit, integrates the scheme results, realizes accurate attitude test, improves the accuracy of calculation performance in the vehicle design process, provides guarantee for calculation of braking stability, operation stability, smoothness performance and the like, and simultaneously eliminates the influence of elastic deformation of a suspension on the height of the center of mass when the suspension is stressed.
Drawings
FIG. 1 is a schematic diagram of a conventional centroid height test;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a structural diagram of the working state of the attitude control clamping block;
fig. 4 is a schematic structural view of the attitude control clamp block.
Description of reference numerals: the device comprises a fixed supporting column 1, a movable supporting column 2, a weighing plate 3, a posture control clamping block 4, a display 5, an anti-rolling block 6, a unilateral clamping block 7, an upper mounting seat of a shock absorber 8, a rigid cylinder support of the shock absorber 9, a buffer block 10 and a spring 11.
Detailed Description
The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
As shown in fig. 2 to 4, an embodiment of the present invention provides a vehicle centroid height measuring apparatus, including a fixed support column 1, a movable support column 2, a weighing pan 3 and a posture control clamp 4, wherein:
the fixed supporting column 1 is used for supporting a rear wheel of a vehicle to be measured, the weighing disc 3 is fixed on the fixed supporting column 1, and the weighing disc 3 is in signal connection with a display 5; the main function of the weighing plate 3 is to weigh the weight, measure the weight change caused by the posture change, and read the weight at each lifting height through the display 5 for difference calculation.
The movable support column 2 can be lifted and lowered in a reciprocating mode along the axis direction, and the movable support column 2 is used for supporting a front wheel of the vehicle to be tested; the movable supporting column 2 mainly aims at realizing different posture changes of the automobile, the lifting height of the movable supporting column 2 can be measured by a vertical ruler through a controller.
The attitude control clamp 4 is arranged on a shock absorber of the vehicle to be tested to resist elastic deformation of a suspension. Considering that the changed attitude causes the suspension to elastically deform after the attitude is changed, this is mainly achieved by the compression spring 11 deforming. In order to prevent the further change of the posture caused by the deformation of the spring 11, the posture control clamping block 4 is added between the shock absorber rigid cylinder support 9 and the shock absorber upper mounting seat 8, the posture control clamping block 4 needs to be wrapped outside the buffer block 10 and therefore needs to be in a hollow state, the posture control clamping block 4 comprises two symmetrically arranged single-side clamping blocks 7, and the single-side clamping blocks 7 are of a C-shaped structure. In order to guarantee that the lower part is supported 9 backstops by the rigid cylinder of shock absorber, still need the steel pipe internal diameter to be less than the support external diameter, in addition, in order to facilitate the operation, regard gesture control clamp splice 4 as two halves, can realize convenient packing into from spring 11 the inside, the length of unilateral clamp splice 7 then needs to be set for according to the design parameter of car, or set for according to measured data, support vehicle jack earlier during placing, spring 11 atress reduces this moment, the clearance increase between the rigid cylinder of buffer block 10 and shock absorber is supported 9, then place very easily, place the back and loosen the jack can.
The invention considers that the tire compression deformation caused by the axle load change affects the whole vehicle posture, in order to eliminate the influence, the tire air pressure is increased to 3.0bar when in test, at the moment, the tire can be approximately considered as a rigid body, and the tire deformation caused by the axle load change can be ignored.
Further, the fixed supporting column 1 is fixed on a sliding platform, and the sliding platform can move in the horizontal direction to be close to or far away from the movable supporting column 2. The sliding platform is mainly used for adapting to automobiles with different wheelbases, and can be lengthened or shortened to realize automobile testing within the wheelbase range of 2.3 meters to 3.0 meters.
Further, the top end of the movable support column 2 is fixed with an anti-rolling block 6, the top surface of the anti-rolling block 6 is concavely provided with an anti-rolling groove, and the inner diameter of the anti-rolling groove is matched with the outer diameter of the front wheel of the vehicle to be tested. The anti-rolling block 6 is mainly used for preventing the automobile from rolling off the larger tire.
After the test begins, move the car front wheel to the 2 central points of movable support column department, in order to prevent that the tire from rolling, place anti-roll piece 6 manually and avoid dangerous the emergence, place a weighing plate 3 below the rear wheel center, record the lifting height and the axle load weight of back this moment, lift certain height and note the height of lifting and the axle load that corresponds, it can to repeat several times.
The invention also provides a method for measuring the height of the mass center of the vehicle, which comprises the following steps:
(1) confirming the vehicle state, filling fuel oil according to 90% of the volume of an oil tank, wherein the vehicle to be tested comprises a spare tire and a vehicle-mounted tool, and the air pressure of the tire is set to be 3.0 bar;
(2) measuring in the condition of servicing quality, recording the load of each wheel, and measuring the height required by the attitude control clamp block 4;
(3) manually increasing a front and rear attitude control clamp block 4 by using a vehicle jacking device;
(4) lifting the front axle or the rear axle, wherein the front wheel and the rear wheel must ensure that at least one axle is in a free state when lifting;
the calculation formula of the height of the mass center is as follows, and multiple measurements are averaged;
hS＝L/m*△m/hB*(L2-hB 2)1/2+rdyn
wherein: h isS: height of center of mass, L: wheelbase, m: weight of the entire vehicle, hB: the lifting height of the movable supporting column 2 (namely the height difference between the front wheel and the rear wheel), the load change of the triangle m axis, and the rdynThe tire load radius.
The invention adopts the structure of additionally installing the attitude limiting block, avoids the influence of attitude change caused by axle load change on the height of the center of mass, increases the tire air pressure, can calculate only by measuring the front lifting height and the rear axle load change, is convenient and quick, can be operated by one person, is easy to refit the test bench by a common unit, integrates the scheme results, realizes accurate attitude test, improves the accuracy of the calculation performance in the vehicle design process, provides guarantee for the calculation of braking stability, operation stability, smoothness performance and the like, and simultaneously eliminates the influence of elastic deformation of the suspension on the height of the center of mass when the suspension is stressed.
The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.
Claims (5)
1. The utility model provides a vehicle barycenter height measuring device which characterized in that, includes fixed support column, activity support column, weighing plate and attitude control clamp splice, wherein:
the fixed supporting columns are used for supporting rear wheels of a vehicle to be measured, the weighing disc is fixed on the fixed supporting columns, and the weighing disc is in signal connection with a display;
the movable supporting column can reciprocate along the axis direction and is used for supporting the front wheel of the vehicle to be tested;
the attitude control clamping block is arranged on a shock absorber of the vehicle to be tested so as to resist elastic deformation of a suspension.
2. The vehicle centroid height measuring apparatus according to claim 1, wherein said fixed support column is fixed to a slide platform, said slide platform being horizontally movable to approach or move away from said movable support column.
3. The vehicle mass center height measuring device according to claim 1, wherein an anti-rolling block is fixed at the top end of the movable supporting column, an anti-rolling groove is concavely arranged on the top surface of the anti-rolling block, and the inner diameter of the anti-rolling groove is adapted to the outer diameter of the front wheel of the vehicle to be measured.
4. The vehicle centroid height measuring apparatus according to claim 1, wherein said attitude control clamp block comprises two symmetrically disposed single-sided clamp blocks, said single-sided clamp blocks being of C-shaped configuration.
5. A vehicle centroid height measuring method, characterized by using the vehicle centroid height measuring apparatus according to any one of claims 1 to 4, comprising the steps of:
(1) confirming the vehicle state, filling fuel oil according to 90% of the volume of an oil tank, wherein the vehicle to be tested comprises a spare tire and a vehicle-mounted tool, and the air pressure of the tire is set to be 3.0 bar;
(2) measuring in a state of servicing quality, recording the load of each wheel, and measuring the height required by the attitude control clamping block;
(3) manually adding a front and rear attitude control clamp block by using a vehicle jacking device;
(4) lifting the front axle or the rear axle, wherein the front wheel and the rear wheel must ensure that at least one axle is in a free state when lifting;
the calculation formula of the height of the mass center is as follows, and multiple measurements are averaged;
hS＝L/m*△m/hB*(L2-hB 2)1/2+rdyn
wherein: h isS: height of center of mass, L: wheelbase, m: weight of the entire vehicle, hB: lifting height of movable support column, load change of delta m axis, rdynThe tire load radius.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011193459.XA CN112326119A (en) | 2020-10-30 | 2020-10-30 | Vehicle mass center height measuring device and method |
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| CN202011193459.XA CN112326119A (en) | 2020-10-30 | 2020-10-30 | Vehicle mass center height measuring device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115265426A (en) * | 2022-07-25 | 2022-11-01 | 中车株洲电力机车有限公司 | Rail transit vehicle and bogie attitude detection method thereof |
| CN116465548A (en) * | 2023-03-02 | 2023-07-21 | 北京汽车集团越野车有限公司 | A method for measuring the height of the center of mass of a vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115265426A (en) * | 2022-07-25 | 2022-11-01 | 中车株洲电力机车有限公司 | Rail transit vehicle and bogie attitude detection method thereof |
| CN116465548A (en) * | 2023-03-02 | 2023-07-21 | 北京汽车集团越野车有限公司 | A method for measuring the height of the center of mass of a vehicle |
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