CN112629878B - Method and device for measuring torsional rigidity of vehicle body - Google Patents
Method and device for measuring torsional rigidity of vehicle body Download PDFInfo
- Publication number
- CN112629878B CN112629878B CN202011422603.2A CN202011422603A CN112629878B CN 112629878 B CN112629878 B CN 112629878B CN 202011422603 A CN202011422603 A CN 202011422603A CN 112629878 B CN112629878 B CN 112629878B
- Authority
- CN
- China
- Prior art keywords
- point
- vehicle body
- measuring
- measurement
- supporting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a method and a device for measuring torsional rigidity of a vehicle body, wherein the method comprises the following steps: controlling a load applying device to apply a preset load to at least one of a first supporting point and a second supporting point of the vehicle body; the first supporting point and the first supporting point are supporting points of the vehicle body on a workbench, and the first supporting point and the second supporting point are respectively positioned on different sides of the vehicle body; acquiring the position offset of different measuring points of the vehicle body detected by a sensor relative to the workbench; determining the torsion angle of a preset reference line of the vehicle body according to the position offset of the different measuring points; and determining the torsional rigidity of the vehicle body according to the preset load and the torsional angle. The technical scheme can test the torsional rigidity of the automobile body, and can prevent the problem that the automobile has larger potential safety hazard due to lower torsional rigidity of the automobile body.
Description
Technical Field
The invention relates to the technical field of automobile manufacturing, in particular to a method and a device for measuring torsional rigidity of an automobile body.
Background
In the automobile manufacturing process, the torsional rigidity of the automobile body is an important index of the automobile performance, if the torsional rigidity is insufficient, the torsional deformation of the automobile body is large in the running process of the automobile, abnormal sound can be generated, fatigue failure of the automobile body can be caused, and potential safety hazards exist.
Disclosure of Invention
The invention discloses a method and a device for measuring torsional rigidity of a vehicle body, which are used for testing the torsional rigidity of the vehicle body and preventing the problem that the vehicle has larger potential safety hazard due to lower torsional rigidity of the vehicle body.
In order to solve the problems, the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present application discloses a method for measuring torsional rigidity of a vehicle body, the method comprising:
controlling a load applying device to apply a preset load to at least one of a first supporting point and a second supporting point of the vehicle body; the first supporting point and the first supporting point are supporting points of the vehicle body on a workbench, and the first supporting point and the second supporting point are respectively positioned on different sides of the vehicle body;
acquiring the position offset of different measuring points of the vehicle body detected by a sensor relative to the workbench;
determining the torsion angle of a preset reference line of the vehicle body according to the position offset of the different measuring points;
and determining the torsional rigidity of the vehicle body according to the preset load and the torsional angle.
In a second aspect, the present invention discloses a measuring device for torsional rigidity of a vehicle body for measuring torsional rigidity of a vehicle body supported on a table, the measuring device comprising:
a load applying device for applying a preset load to at least one of a first support point and a second support point of the vehicle body;
the sensors are respectively arranged at different measuring points of the vehicle body and are used for detecting the position offset of the different measuring points relative to the workbench.
The technical scheme adopted by the invention can achieve the following beneficial effects:
the embodiment of the invention discloses a method for measuring torsional rigidity of a vehicle body, which can be used for measuring the torsional rigidity of the vehicle body of a vehicle, when the method is implemented, the vehicle body can be supported on a workbench, a load applying device is controlled to apply a preset load to at least one of a first supporting point and a second supporting point, the position offset of different measuring points on the vehicle body relative to the workbench can be detected through a sensor, further, the torsional angle of the vehicle body with preset reference can be determined according to the position offset of different measuring points, and the torsional rigidity of the vehicle body can be determined according to the preset load and the torsional angle, so that the problem that a greater potential safety hazard exists in the vehicle due to lower torsional rigidity of the vehicle body can be prevented.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a flow chart of a measurement method disclosed in an embodiment of the present invention;
FIG. 2 is a schematic diagram showing the calculation of torsion angle in the measurement method according to the embodiment of the present invention;
FIG. 3 is a schematic diagram of a measurement point layout mode in a measurement device according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a measurement point layout manner in another direction in the measurement device according to the embodiment of the present invention.
Reference numerals illustrate:
100-a vehicle body, 111-a first supporting point, 112-a second supporting point, 121-a first fixed point, 122-a second fixed point,
201-first measurement point, 202-second measurement point, 203-third measurement point, 204-fourth measurement point, 205-fifth measurement point, 206-sixth measurement point, 207-seventh measurement point, 208-eighth measurement point,
300-bracket,
400-load applying device,
500-workbench.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The technical scheme disclosed by each embodiment of the invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present invention discloses a method for measuring torsional rigidity of a vehicle body, by which the torsional rigidity of the vehicle body can be measured, the method comprising:
s1, controlling a load applying device to apply a preset load to at least one of a first supporting point and a second supporting point of a vehicle body.
The first supporting point and the first supporting point are supporting points of the vehicle body on the workbench, and the first supporting point and the second supporting point are respectively located on different sides of the vehicle body.
Specifically, the first supporting point and the second supporting point of the vehicle body can be movably supported on the workbench through the rotating supporting piece, under the condition that the connection relation between the first supporting point and the workbench and the connection relation between the second supporting point and the workbench are reliable, and preset loads with equal sizes and opposite directions can be simultaneously applied to the first supporting point and the second supporting point through the rotating supporting piece, so that the accuracy of the measurement result can be further improved. A first connecting line between the first supporting point and the second supporting point is perpendicular to the front longitudinal beam of the vehicle body, and a rotation center of the rotation supporting piece is located at the midpoint of the first connecting line. The first fixing point and the second fixing point of the vehicle body can be mounted on the workbench through a rotary hinge, and a second connecting line between the first fixing point and the second fixing point is perpendicular to a rear longitudinal beam of the vehicle body.
More specifically, the first supporting point and the second supporting point can be fixedly connected to the rotating supporting piece through parts such as riveting or a bolt connecting piece, or sliding rods can be fixed to the first supporting point and the second supporting point, the sliding rods are in sliding fit with sliding blocks on the rotating supporting piece, and the sliding direction is parallel to the connecting line of the first supporting point and the second supporting point. The rotating support piece can be an inverted triangle cross beam specifically, and in the process of installing the rotating support piece, a longitudinal beam of the rotating support piece is fixed on the workbench, the cross beam of the rotating support piece is connected with the first support point and the second support point, and meanwhile, the rotating center of the rotating support piece is located at the center position of the first support point and the center position of the second support point, and further in the process of applying load, the first support point and the second support point are guaranteed to move back to back. The first fixing point and the second fixing point are installed on the workbench through a rotary hinge, and the workbench can be a metal hard workbench.
In a motor vehicle, a front damper and a rear damper are generally provided, and both the front damper and the rear damper function to weaken or even prevent torsional deformation of a body of the motor vehicle, and further, the first support point and the second support are symmetrically disposed with respect to a central axis of the body. In order to ensure that the measurement result is as accurate as possible, the first supporting point and the second supporting point may be both located at the connection point of the vehicle body and the front shock absorber, and correspondingly, the first fixing point and the second fixing point may be both located at the connection point of the vehicle body and the rear shock absorber.
S2, acquiring the position offset of different measuring points of the vehicle body detected by the sensor relative to the workbench.
Specifically, the sensor may be a displacement sensor, and by arranging the displacement sensor at different measurement points of the vehicle body, the displacement sensor may be used to measure the positional offset of the vehicle body at a plurality of different measurement points relative to the table, that is, the torsion condition of the vehicle body when being stressed. Specifically, each displacement sensor can all be supported on the workbench through the rigid support piece, and the rigid support piece can be of a metal columnar structure, and each displacement sensor can be installed on the rigid support piece through the bolt connection piece. In the process of selecting the measuring points, a plurality of measuring points can be selected at different positions of the vehicle body according to the actual positions of the first supporting point and the second supporting point, the measuring points are not overlapped with each other, and the measuring points are not overlapped with the first supporting point, the second supporting point, the first fixed point and the second fixed point.
S3, determining the torsion angle of a preset reference line of the vehicle body according to the position offset of different measuring points. Specifically, after a preset load is applied to the vehicle body, the vehicle body is stressed to generate certain deformation, so that the sensors arranged at different measuring points can measure the position offset of the position, the position offset represents the deformation degree of the vehicle body at different positions, the position of the measuring point is related to the measured position offset, the torsion angles of the front shaft and the rear shaft of the vehicle body relative to the workbench can be obtained by combining the positions of the measuring points and the position offsets of the corresponding positions, and the precision of the torsion angles is related to the positions of the measuring points.
The torsion angle of the rear axle of the vehicle body is the torsion angle of the connecting line of the first fixed point and the second fixed point, and the torsion angle of the front axle of the vehicle body is the torsion angle of the connecting line of the first supporting point and the second supporting point. Based on the above, the torsion angle of the front axle of the vehicle body with respect to the rear axle, that is, the torsion angle of the predetermined reference line of the vehicle body can be obtained.
And S4, determining the torsional rigidity of the vehicle body according to the preset load and the torsional angle. Because the torsion angle of the vehicle body is directly related to the magnitude of the preset load applied to the vehicle body, the torsion angle is relatively larger under the condition of larger preset load, and the torsion angle is relatively smaller under the condition of smaller preset load, so that positive correlation is formed between the torsion angle and the preset load. Accordingly, the torsional rigidity of the vehicle body can be determined from the preset load and the torsion angle of the above-described predetermined reference line.
The embodiment of the invention discloses a method for measuring torsional rigidity of a vehicle body, which can be used for measuring the torsional rigidity of the vehicle body of a vehicle, when the method is implemented, the vehicle body can be supported on a workbench, a load applying device is controlled to apply a preset load to at least one of a first supporting point and a second supporting point, the position offset of different measuring points on the vehicle body relative to the workbench can be detected through a sensor, further, the torsional angle of the vehicle body with preset reference can be determined according to the position offset of different measuring points, and the torsional rigidity of the vehicle body can be determined according to the preset load and the torsional angle, so that the problem that a greater potential safety hazard exists in the vehicle due to lower torsional rigidity of the vehicle body can be prevented.
As described above, the accuracy of the torsion angle of the predetermined reference line is related to the selected positions of the plurality of measurement points. Optionally, the plurality of different measurement points may include a first measurement point, a second measurement point, a third measurement point, a fourth measurement point, a fifth measurement point, a sixth measurement point, a seventh measurement point, and an eighth measurement point. In order to improve the accuracy of the measured torsion angle, the first measuring point and the second measuring point may be located on opposite sides of the first supporting point, the third measuring point and the fourth measuring point may be located on opposite sides of the second supporting point, the fifth measuring point and the sixth measuring point may be located on opposite sides of the first fixing point, and the seventh measuring point and the eighth measuring point may be located on opposite sides of the second fixing point. Under the condition of adopting the technical scheme, eight measuring points can be grouped in pairs, position deviation measuring work is provided for different positions around one connecting position of the vehicle body respectively, the device has certain contrast, and the accuracy of the obtained torsion angle can be further improved by enabling the average value of the position deviation amounts measured by the two measuring points arranged in the group to represent the position deviation amount of the connecting position.
Based on the above, the step S2 includes:
the method comprises the steps of obtaining the position offset of a first measuring point, a second measuring point, a third measuring point, a fourth measuring point, a fifth measuring point, a sixth measuring point, a seventh measuring point and an eighth measuring point detected by a sensor relative to a workbench, wherein the sensors are uniformly distributed on the eight measuring points so as to detect the position offset of each position.
Similarly, in the process of arranging the sensor, the first measurement point and the second measurement point are smaller than the second support point, the first fixed point and the second fixed point, that is, the first measurement point and the second measurement point are disposed on two opposite sides of the first support point, and the other sensors (or measurement points) are also disposed on the same side of the first support point.
In addition, two front stringers and two rear stringers that set up on the automobile body are all symmetry setting, and first measuring point and second measuring point all can set up on a front stringer, and third measuring point and fourth measuring point can set up on another front stringer, and fifth measuring point and sixth measuring point can set up on a rear stringer, and seventh measuring point and eighth measuring point can set up on another rear stringer.
For convenience of description, a coordinate system may be established for the vehicle body, the longitudinal direction of the vehicle body being the direction in which the x-axis is located, the width direction of the vehicle body being the direction in which the y-axis is located, and the height direction of the vehicle body being the direction in which the z-axis is located. Before the body is twisted, the first support point, the second support point, the first fixed point, and the second fixed point can all be considered to lie in the xy plane.
Alternatively, the positions of the first measurement point and the third measurement point in the longitudinal direction of the vehicle body are identical, that is, the x-coordinates of the first measurement point and the third measurement point are identical, in which case the adverse effect of the difference in the respective position parameters of the two measurement points corresponding to the same connection point (including the first support point, the second support point, the first fixed point, and the second fixed point) on the accuracy of the equivalent value can be further reduced. For example, under the condition that other conditions are not changed, compared with the fact that the x coordinates of the first measurement point and the second measurement point are different, the equivalent position offset of the first support point obtained by adopting the technical scheme of making the x coordinates of the first measurement point and the second measurement point identical in the above embodiment obviously can be closer to the actual position offset of the first support point.
Based on the above-described embodiment, the positions of the second measurement point and the fourth measurement point in the longitudinal direction of the vehicle body are optionally the same, that is, the x-coordinates of the second measurement point and the fourth measurement point are the same.
And/or the fifth measuring point and the seventh measuring point are the same in position in the length direction of the vehicle body; that is, the x-coordinates of the fifth measurement point and the seventh measurement point are the same.
And/or the sixth measurement point and the eighth measurement point are identical in position in the longitudinal direction of the vehicle body, that is, the x-coordinates of the sixth measurement point and the eighth measurement point are identical.
Further, in the width direction of the vehicle body:
the distance between the first measuring point and the first supporting point is equal to the distance between the third measuring point and the second supporting point, i.e. the distances between the first measuring point and the second measuring point and the first connecting line are equal. In this case, the average value of the two positional offsets measured by the first measurement point and the second measurement point represents the accuracy of the equivalent positional offset of the first support point to be relatively higher, so that the accuracy of the value of the obtained torsion angle can be improved, and the accuracy of the measured value of the torsion rigidity of the vehicle body can be improved.
Likewise, the spacing between the second measuring point and the first supporting point may be made equal to the spacing between the fourth measuring point and the second supporting point, i.e., the spacing between the second measuring point and the fourth measuring point and the first connecting line.
Likewise, the spacing between the fifth measurement point and the first fixed point may be made equal to the spacing between the seventh measurement point and the second fixed point; that is, the intervals between the fifth measurement point and the seventh measurement point and the second connecting line are equal.
Likewise, the distance between the seventh measuring point and the first fixed point may be made equal to the distance between the eighth measuring point and the second fixed point, i.e. the distance between the sixth measuring point and the eighth measuring point and the second connecting line.
Based on the above embodiment, the torsional rigidity K of the vehicle body is optionally determined according to the objective function k=m/θfront.
Wherein θ front ＝△θ2+(△θ1-△θ2)*(L 2 -L F )/(L 2 -L 1 )
△θ1＝arctan(△L 13 /L Y1 )-θ rear
△θ2＝arctan(△L 24 /L Y2 )-θ rear
θ rear ＝arctan(△L rear /(L Y3 +L Y4 )/2)
△L rear ＝△L 68 +(△L 57 -△L 68 )*(L 4 -L R )/(L 4 -L 3 )
Under the condition that no preset load is applied to the vehicle body, the connecting line between the first supporting point and the second supporting point is a first connecting line, and the connecting line between the first fixed point and the second fixed point is a second connecting line; in the case that a preset load is applied to one of the first supporting point and the second supporting point, a line between the first supporting point and the second supporting point is a third line, a line between the first fixed point and the second fixed point is a fourth line, a line between the first measuring point (i.e., the first measuring point, the other same thing) and the third measuring point is a fifth line, and a line between the second measuring point and the fourth measuring point is a sixth line; Δθ1 is a torsion angle of the fifth wire with respect to the fourth wire; Δθ2 is a torsion angle of the sixth wire with respect to the fourth wire; θ front A torsion angle of the third wire with respect to the fourth wire; θ rear For the fourth wire relative to the second wireIs a torsion angle of (2); l (L) 1 An x coordinate of the first measurement point; l (L) 2 An x coordinate of the second measurement point; l (L) 3 An x coordinate of a fifth measurement point; l (L) 4 An x coordinate of a sixth measurement point; l (L) F An x coordinate of the first support point; l (L) R An x-coordinate that is a first fixed point; deltaL 13 The relative displacement of the first measuring point and the third measuring point in the z direction is used as the relative displacement; deltaL 24 The relative displacement of the second measuring point and the fourth measuring point in the z direction is obtained; deltaL 57 The relative displacement of the fifth measuring point and the seventh measuring point in the z direction is obtained; deltaL 68 The relative displacement of the sixth measuring point and the eighth measuring point in the z direction is obtained; deltaL rear The theoretical relative displacement in the z direction of a first theoretical point identical to the x coordinate of the first fixed point and a second theoretical point identical to the x coordinate of the second fixed point; l (L) Y1 A distance between the first measuring point and the third measuring point in the y direction; l (L) Y2 A distance between the second measuring point and the fourth measuring point in the y direction; l (L) Y3 A distance between the fifth measuring point and the seventh measuring point in the y direction; l (L) Y4 The distance between the sixth measurement point and the eighth measurement point in the y direction.
In detail, (L) in the process of measuring torsional rigidity of the vehicle body 4 -L 3 ) For the distance between the sixth measurement point (or eighth measurement point) and the fifth measurement point (or seventh measurement point) on the x-axis, (. DELTA.L) 57 -△L 68 ) As the difference between the relative displacement amounts of the fifth measurement point and the seventh measurement point in the z direction and the relative displacement amounts of the sixth measurement point and the eighth measurement point in the z direction, (. DELTA.L) 57 -△L 68 )/(L 4 -L 3 ) I.e., the amount of change in the relative displacement in the z direction between the two end points in the unit x length, further, (. DELTA.L) 57 -△L 68 )*(L 4 -L R )/(L 4 -L 3 ) Namely the change of the relative displacement of the first fixed point and the second fixed point in the z direction and the relative displacement of the seventh measuring point and the eighth measuring point in the z direction, and further, deltaL 68 +(△L 57 -△L 68 )*(L 4 -L R )/(L 4 -L 3 ) I.e. the first theoretical point sum being the same as the first fixed point x-coordinateThe theoretical relative displacement of the second theoretical point in the z-direction, which is the same as the x-coordinate of the second fixed point. The y-coordinates of the first theoretical point are the same as those of the fifth and sixth measurement points, and the y-coordinates of the second theoretical point are the same as those of the seventh and eighth measurement points.
Secondly, according to the theoretical relative displacement of the first theoretical point and the second theoretical point in the z direction, the torsion angle of the fourth connecting line relative to the second connecting line, namely the torsion angle of the rear axle of the vehicle body, can be obtained. (L) Y3 +L Y4 ) And/2 is an average value of the distances between the fifth measurement point and the seventh measurement point in the y direction and the distances between the sixth measurement point and the eighth measurement point in the y direction, that is, the distances between the first theoretical point and the second theoretical point in the y direction, as shown in fig. 2, and according to an inverse function, an included angle between a connecting line (i.e., a fourth connecting line) between the first theoretical point (or the first fixed point) and the second theoretical point (or the second fixed point) and the y axis can be obtained. I.e. the torsion angle of the fourth wire with respect to the second wire, which may represent the degree of torsion of the vehicle body.
And determining the torsion angle of the connecting line (namely the fifth connecting line) between the first measuring point and the third measuring point relative to the rear axle (namely the fourth connecting line) and the torsion angle of the connecting line (namely the sixth connecting line) between the second measuring point and the fourth measuring point relative to the rear axle (namely the fourth connecting line) according to the torsion angle of the rear axle of the vehicle body. Wherein ([ delta ] L) 13 /L Y1 ) And (. DELTA.L) 24 /L Y2 ) The opposite sides of the triangle are compared with the adjacent sides, the included angle between the fifth connecting line and the first connecting line and the included angle between the sixth connecting line and the first connecting line can be obtained by means of inverse functions, and the torsion angle delta theta 1 of the fifth connecting line relative to the fourth connecting line and the torsion angle delta theta 2 of the sixth connecting line relative to the fourth connecting line can be obtained by means of difference between the torsion angles of the fifth connecting line and the rear axle.
Then, by combining the x coordinates of the first measurement point, the second measurement point, and the first support point, the torsion angle between the twisted front axis (i.e., the third link) and the twisted rear axis (i.e., the fourth link) can be determined. Wherein, (L) 2 -L 1 ) For the first measuring point and the second measuring point in the x directionSpacing in the direction, (. DELTA.θ1-DELTA.θ2)/(L) 2 -L 1 ) Is the change in torsion angle between two ends in unit x length, further, (DELTAtheta 1-DELTA theta 2) is 2 -L F )/(L 2 -L 1 ) Namely, the included angle of the third connecting line relative to the sixth connecting line is summed with delta theta 2 (the included angle of the sixth connecting line relative to the fourth connecting line) to obtain the torsion angle theta of the third connecting line relative to the fourth connecting line front . Since the first supporting point and the second supporting point are both positioned on the third connecting line, the connecting line between the two measuring points with the same x coordinate as the first supporting point is also coincident with the third connecting line.
Finally, according to k=m/θ front In combination with the angle of torsion theta of the front axle relative to the rear axle front And the torsional rigidity K of the vehicle body can be obtained by the load M.
Based on the embodiment, when the measuring method is implemented, the vehicle body can be firstly supported and fixed on the workbench, wherein the first supporting point and the second supporting point of the vehicle body are movably supported by the rotary supporting piece, and the first fixed point and the second fixed point are installed by the rotary hinge; at least two sensors are uniformly distributed around the first supporting point, the second supporting point, the first fixed point and the second fixed point, and under the condition that a preset load parallel to the z direction is applied to one of the first supporting point and the second supporting point, the torsional rigidity of the vehicle body can be obtained according to an objective function by acquiring displacement amounts measured by a plurality of sensors and parameters such as positions and intervals of the sensors on the x axis and the y axis and based on the magnitude of the preset load.
In summary, in the process of arranging the sensor, the sensor can be arranged according to actual conditions, so that the sensor can be arranged at a position where the rotating support piece does not shield, and the rigid support piece can be used for being installed on the workbench, so that the displacement result measured by the sensor is ensured to be an accurate value; and because at least two sensors are arranged at one supporting point, the displacement of two measuring points equivalent to the transverse positions of the first supporting point and the second supporting point can be determined through the measuring data and the position parameters of a plurality of sensors, and the accuracy of the measuring mode is relatively high.
Further, two sets of measurement data can be obtained by applying the same preset load at different positions by applying the preset load to the first support point and the second support point respectively, and the measured torsional rigidity data of the vehicle body can be further calibrated through corresponding calculation based on the two sets of measurement data.
Based on this, in the measurement method disclosed in the embodiment of the present application, the step S1 may include:
s11, controlling a load applying device to apply a preset load to a first supporting point of a vehicle body;
and S12, controlling the load applying device to apply a preset load to a second supporting point of the vehicle body.
In this case, the step S3 may include:
s31, determining a first torsion angle of a preset reference line of the vehicle body according to first position offset of different measuring points;
s32, determining a second torsion angle of a preset reference line of the vehicle body according to second position offset of different measuring points;
s33, determining the torsion angle of a preset reference line of the vehicle body according to the first torsion angle and the second torsion angle.
Corresponding to the above formula, Δθ1= (Δθ1) according to the present embodiment left +θ1 right )/2，△θ2＝(△θ2 left +θ2 right ) And/2, wherein,
△θ1 left in order to provide a torsion angle of the fifth wire with respect to the fourth wire in the case that a preset load is applied to the first supporting point; θ1 right In the case that a preset load is applied to the two supporting points, the torsion angle of the fifth connecting line relative to the fourth connecting line is set; delta theta 2 left A torsion angle of the sixth wire with respect to the fourth wire in a case that a preset load is applied to the first supporting point; theta 2 right In order to provide a torsion angle of the sixth wire with respect to the fourth wire in the case that a predetermined load is applied to the second supporting point.
That is, the measurement is performed in two times, one of which uses the first supporting point as the loading point and the other of which usesThe second supporting point is a loading point. By making the direction and magnitude of the applied preset load equal, the obtained θ can be further accurate front . The included angle delta theta 1 between the fifth connecting line and the fourth connecting line and the included angle delta theta 2 between the sixth connecting line and the fourth connecting line can be obtained in the two measuring processes, and the accuracy of the obtained delta theta 1 and delta theta 2 is higher through an average value calculation mode, so that the accuracy of the torsion rigidity of the obtained vehicle body is higher. Note that, in the case where the loading points are different, the manner of determining Δθ1 and Δθ2 is the same as that of the above-described embodiment, and the text is considered to be concise and will not be repeated here.
Further, the accuracy of the measured value of the torsional rigidity of the vehicle body can be improved by means of multiple measurements and averaging. In detail, the preset load includes a first preset load and a second preset load, and the position offset includes a first position offset and a second position offset; the torsion angles include a first torsion angle and a second torsion angle.
In the measurement method disclosed in the embodiment of the present application, the step S1 may include:
s13, controlling the load applying device to apply a first preset load to at least one of a first supporting point and a second supporting point of the vehicle body;
s14, controlling the load applying device to apply a second preset load to at least one of the first supporting point and the second supporting point of the vehicle body.
Correspondingly, the step S4 includes:
s41, determining the first torsional rigidity of the vehicle body according to the first preset load and the first torsional angle.
S42, determining second torsional rigidity of the vehicle body according to a second preset load and a second torsional angle;
s43, determining the torsional rigidity of the vehicle body according to the first torsional rigidity and the second torsional rigidity.
That is, by applying preset loads of different magnitudes to the same loading point to obtain different torsion angles, the measured value of the torsion rigidity of the vehicle body can be made more accurate by averaging the torsion rigidity obtained in various cases where the loads are different. In the process of changing the magnitude of the preset load, the load strength needs to be ensured within a certain range, so that the vehicle body is prevented from being irreversibly deformed due to the extremely large load, and the accuracy of the measurement result is adversely affected greatly. Similarly, in the above embodiment, the obtaining and calculating manners of each parameter are the same as those of the above embodiment, and the text is considered to be concise, and will not be described in detail herein.
In order to further improve the accuracy of the measurement result, optionally, in the process of laying out a plurality of sensors, as shown in fig. 3, the positions of the first measurement point and the second measurement point in the width direction of the vehicle body may be made the same, that is, the y coordinates of the first measurement point and the second measurement point may be made equal.
Under the condition of adopting the technical scheme, the first measuring point and the second measuring point are distributed in the y direction, so that influence factors existing when the first measuring point and the second measuring point are used as equivalent points can be reduced as much as possible, and further under the condition that the loading point is subjected to load action, the displacement variation of the first measuring point and the second measuring point in the z direction can be approximately considered to be only the difference between the displacement variation of the first measuring point and the displacement variation of the second measuring point in the z direction and the distance between the displacement variation of the first measuring point and the loading point in the x direction, and the accuracy of the measuring result of the torsional rigidity of the vehicle body can be further improved.
Similarly, by making the y coordinates of the third measurement point and the fourth measurement point equal, the y coordinates of the fifth measurement point and the sixth measurement point equal, and the y coordinates of the seventh measurement point and the eighth measurement point equal, the accuracy of the measurement result of the torsional rigidity of the vehicle body can be further improved.
As above, in the y-direction, the first measurement point may be disposed on the side of the first support point away from the second support point, and in general, the weaker the torsion resistance of the object at a position closer to the edge, so in another embodiment of the present application, as shown in fig. 3, the first measurement point and the third measurement point may be both located between the first support point and the second support point, in which case the influence on the accuracy of the measurement result at the edge of the vehicle body may be reduced as much as possible, so as to further improve the accuracy of the measurement result of the torsional rigidity of the vehicle body.
Based on the above embodiment, optionally, in the y-direction, the second measurement point and the fourth measurement point are both located between the first support point and the second support point, the fifth measurement point and the seventh measurement point are located between the first fixed point and the second fixed point, and the sixth measurement point and the eighth measurement point are located between the first fixed point and the second fixed point.
Further, in the y direction, the distance between the first measuring point and the first supporting point can be equal to the distance between the third measuring point and the second supporting point, and therefore the influence factors of the relative displacement of the first measuring point and the third measuring point in the z direction can be reduced, the factors affecting the relative displacement of the first measuring point and the third measuring point in the z direction are only the load size and the torsional rigidity of the vehicle body, and accuracy of measuring results is further improved.
Similarly, in the y-direction, the distance between the second measurement point and the first support point may be equal to the distance between the fourth measurement point and the second support point, the distance between the fifth measurement point and the first fixed point may be equal to the distance between the seventh measurement point and the second fixed point, or the distance between the sixth measurement point and the first fixed point may be equal to the distance between the eighth measurement point and the second fixed point.
Based on the method for measuring torsional rigidity disclosed in any of the above embodiments, as shown in fig. 3 and fig. 4, the embodiment of the application also discloses a device for measuring torsional rigidity. With which the torsional rigidity of the vehicle body 100 can be measured, the measuring device including the load applying apparatus 400 and a plurality of sensors.
The load applying apparatus 400 may be an electronic loading device, the load applying apparatus 400 may apply a preset load to at least one of the first support point 111 and the second support point 112, and the magnitude of the applied preset load may be determined according to actual conditions, and the preset load direction is a direction perpendicular to the vehicle body 100.
The sensors are respectively arranged at different measuring points of the vehicle body, and the sensors can detect the position offset between the position of the different measuring points and the position of the workbench. More specifically, as described above, the eight measurement points may be eight, and the eight measurement points include a first measurement point 201 and a second measurement point 202 disposed adjacent to the first support point 111, the first measurement point 201 and the second measurement point 202 are disposed on opposite sides of the first connection line, a third measurement point 203 and a fourth measurement point 204 disposed adjacent to the second support point 112, the third measurement point 203 and the fourth measurement point 204 are disposed on opposite sides of the first connection line, a fifth measurement point 205 and a sixth measurement point 206 disposed adjacent to the first fixed point 121, the fifth measurement point 205 and the sixth measurement point 206 are disposed on opposite sides of the second connection line, a seventh measurement point 207 and an eighth measurement point 208 disposed adjacent to the second fixed point 122, and the seventh measurement point 207 and the eighth measurement point 208 are disposed on opposite sides of the second connection line, respectively.
In addition, the vehicle body may be mounted on the workbench by means of a rotation support member and a rotation hinge, the rotation support member may be an inverted triangle beam, the rotation support member supports the first support point 111 and the second support point 112 of the vehicle body 100, and a rotation center of the rotation support member is located at a midpoint of a first connecting line between the first support point 111 and the second support point 112. The pivot hinge is connected to a first fixing point 121 and a second fixing point 122 of the vehicle body 100, a second connecting line between the first fixing point 121 and the second fixing point 122 is parallel to the first connecting line, and the second connecting line is perpendicular to the front side member and the rear side member of the vehicle body 100. In the process of supporting the vehicle body 100, the rotating support and the rotating hinge can be connected with the vehicle body by means of connecting pieces such as bolts, and of course, other connecting modes can be adopted to mount the vehicle body 100 on the fixed workbench 500 through the rotating support and the rotating hinge.
From the above, in the process of arranging the sensor, the sensor can be arranged according to the actual situation, so that the sensor can be arranged at a position where the rotating support piece does not shield, and the rigid bracket 300 can be used to be installed on the workbench 500, so that the equivalent position offset of the connecting point can be obtained through a plurality of measuring points, the torsional rigidity of the automobile body can be obtained, and the problem that the automobile has a large potential safety hazard due to the lower torsional rigidity of the automobile body can be prevented.
The foregoing embodiments of the present invention mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in view of brevity of line text, no further description is provided herein.
The foregoing is merely exemplary of the present invention and is not intended to limit the present invention. Various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are to be included in the scope of the claims of the present invention.
Claims (7)
1. The method for measuring the torsional rigidity of the vehicle body is characterized in that the supporting points of the vehicle body supported on the workbench comprise a first supporting point, a second supporting point, a first fixed point and a second fixed point, a first connecting line between the first supporting point and the second supporting point is perpendicular to a front longitudinal beam of the vehicle body, a second connecting line between the first fixed point and the second fixed point is perpendicular to a rear longitudinal beam of the vehicle body, and different measuring points of the vehicle body comprise a first measuring point and a second measuring point which are positioned at two sides of the first supporting point, a third measuring point and a fourth measuring point which are positioned at two sides of the second supporting point, a fifth measuring point and a sixth measuring point which are positioned at two sides of the first fixed point, and a seventh measuring point and an eighth measuring point which are positioned at two sides of the second fixed point;
the measuring method comprises the following steps:
the load applying device is controlled to apply preset loads with the same size and the same direction to the first supporting point and the second supporting point respectively;
acquiring the position offset of each of the first measurement point, the second measurement point, the third measurement point, the fourth measurement point, the fifth measurement point, the sixth measurement point, the seventh measurement point and the eighth measurement point detected by a sensor relative to the workbench, wherein the position offset comprises a first position offset and a second position offset;
determining a first torsion angle of a preset reference line of the vehicle body according to the first position offset of the different measuring points;
determining a second torsion angle of a preset reference line of the vehicle body according to the second position offset of the different measuring points;
determining a torsion angle of a preset reference line of the vehicle body according to the first torsion angle and the second torsion angle;
determining the torsional rigidity of the vehicle body according to the preset load and the torsional angle;
the measurement work is performed twice, wherein one of the measurement work is performed by taking the first supporting point as a loading point, the other measurement work is performed by taking the second supporting point as a loading point, so as to obtain two sets of measurement data, and the torsional rigidity of the measured vehicle body is calibrated based on the two sets of measurement data.
2. The method of measuring torsional rigidity of a vehicle body according to claim 1, wherein the preset load includes a first preset load and a second preset load, and the positional offset includes a first positional offset and a second positional offset; the torsion angles include a first torsion angle and a second torsion angle;
the control load applying apparatus applying a preset load to at least one of a first support point and a second support point of the vehicle body includes:
controlling a load applying device to apply a first preset load to at least one of a first support point and a second support point of the vehicle body;
controlling a load applying device to apply a second preset load to at least one of a first supporting point and a second supporting point of the vehicle body;
the determining the torsional rigidity of the vehicle body according to the preset load and the torsional angle comprises:
determining a first torsional rigidity of the vehicle body according to the first preset load and the first torsional angle;
determining a second torsional rigidity of the vehicle body according to the second preset load and the second torsional angle;
and determining the torsional rigidity of the vehicle body according to the first torsional rigidity and the second torsional rigidity.
3. The method for measuring torsional rigidity of a vehicle body according to claim 1 or 2, characterized in that the first measurement point and the third measurement point are identical in position in the longitudinal direction of the vehicle body;
and/or the positions of the second measuring point and the fourth measuring point in the length direction of the vehicle body are the same;
and/or the fifth measuring point and the seventh measuring point are positioned at the same position in the length direction of the vehicle body;
and/or the sixth measuring point and the eighth measuring point are positioned at the same position in the length direction of the vehicle body.
4. The method for measuring torsional rigidity of a vehicle body according to claim 1 or 2, characterized in that the first measurement point and the second measurement point are identical in position in the width direction of the vehicle body;
and/or the third measuring point and the fourth measuring point are the same in position in the width direction of the vehicle body;
and/or the fifth measuring point and the sixth measuring point are the same in position in the width direction of the vehicle body;
and/or the seventh measurement point and the eighth measurement point are positioned the same in the width direction of the vehicle body.
5. The method of measuring torsional rigidity of a vehicle body according to claim 1 or 2, characterized in that the first measurement point and the third measurement point are located between the first support point and the second support point;
and/or the second measurement point and the fourth measurement point are located between the first support point and the second support point;
and/or the fifth measurement point and the seventh measurement point are located between the first fixed point and the second fixed point;
and/or the sixth measurement point and the eighth measurement point are located between the first fixed point and the second fixed point.
6. The method for measuring torsional rigidity of a vehicle body according to claim 1 or 2, characterized in that in a length direction of the vehicle body:
a distance between the first measuring point and the first supporting point is equal to a distance between the second measuring point and the first supporting point;
and/or a spacing between the third measurement point and the second support point equal to a spacing between the fourth measurement point and the second support point;
and/or a spacing between the fifth measurement point and the first fixed point equal to a spacing between the sixth measurement point and the first fixed point;
and/or the spacing between the seventh measurement point and the second fixed point is equal to the spacing between the eighth measurement point and the second fixed point.
7. The method for measuring torsional rigidity of a vehicle body according to claim 1 or 2, characterized in that, in the width direction of the vehicle body:
a distance between the first measuring point and the first supporting point is equal to a distance between the third measuring point and the second supporting point;
and/or a spacing between the second measurement point and the first support point is equal to a spacing between the fourth measurement point and the second support point;
and/or a spacing between the fifth measurement point and the first fixed point equal to a spacing between the seventh measurement point and the second fixed point;
and/or a spacing between the seventh measurement point and the first fixed point is equal to a spacing between the eighth measurement point and the second fixed point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011422603.2A CN112629878B (en) | 2020-12-08 | 2020-12-08 | Method and device for measuring torsional rigidity of vehicle body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011422603.2A CN112629878B (en) | 2020-12-08 | 2020-12-08 | Method and device for measuring torsional rigidity of vehicle body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112629878A CN112629878A (en) | 2021-04-09 |
| CN112629878B true CN112629878B (en) | 2023-07-14 |
Family
ID=75308887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011422603.2A Active CN112629878B (en) | 2020-12-08 | 2020-12-08 | Method and device for measuring torsional rigidity of vehicle body |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112629878B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2758727Y (en) * | 2004-11-22 | 2006-02-15 | 比亚迪股份有限公司 | Measurer for curve rigid of automobile chassis |
| CN1769858A (en) * | 2004-11-05 | 2006-05-10 | 上海比亚迪有限公司 | Torsion rigidity measurer for automobile chassis |
| CN102435508A (en) * | 2011-09-14 | 2012-05-02 | 江苏科技大学 | White car body static stiffness restriction device and static stiffness detection method |
| CN102661862A (en) * | 2012-05-15 | 2012-09-12 | 吉林大学 | Test bench lifting device for traction transmission system of high-speed train suspension bogie |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102455251B (en) * | 2010-10-22 | 2014-05-21 | 上海汽车集团股份有限公司 | Automotive body in white torsion rigidity test system and method thereof |
| CN201892643U (en) * | 2010-10-22 | 2011-07-06 | 上海汽车集团股份有限公司 | Testing point arrangement system for testing static rigidity of automobile bodies in white |
| CN203745209U (en) * | 2014-03-14 | 2014-07-30 | 吉林大学 | Bending and twisting static rigidity test system for white car body structure |
| CN104573174B (en) * | 2014-11-20 | 2018-03-09 | 华晨汽车集团控股有限公司 | A kind of body stiffness analysis method based on CAE |
| WO2017071119A1 (en) * | 2015-10-28 | 2017-05-04 | 株洲时代新材料科技股份有限公司 | Method for improving overall performance of rail vehicle bogie and suspension damping system |
-
2020
- 2020-12-08 CN CN202011422603.2A patent/CN112629878B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1769858A (en) * | 2004-11-05 | 2006-05-10 | 上海比亚迪有限公司 | Torsion rigidity measurer for automobile chassis |
| CN2758727Y (en) * | 2004-11-22 | 2006-02-15 | 比亚迪股份有限公司 | Measurer for curve rigid of automobile chassis |
| CN102435508A (en) * | 2011-09-14 | 2012-05-02 | 江苏科技大学 | White car body static stiffness restriction device and static stiffness detection method |
| CN102661862A (en) * | 2012-05-15 | 2012-09-12 | 吉林大学 | Test bench lifting device for traction transmission system of high-speed train suspension bogie |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112629878A (en) | 2021-04-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7752003B2 (en) | Hysteresis compensation in a coordinate measurement machine | |
| US11247305B2 (en) | Numerical control device and numerical control meihod for machine tool | |
| CN108132033B (en) | Automobile chassis rear suspension part assembly simulation detection tool and detection analysis method | |
| EP2500684A1 (en) | Method of calibrating surface texture measurement device | |
| CN109115523B (en) | Transverse stabilizer bar calibration test and fatigue endurance test bench and test method | |
| CN103808238A (en) | Shape measuring machine and method for correcting shape measurement errors | |
| CN112504670B (en) | RV reduction gear precision retentivity and fatigue life testing arrangement | |
| CN113656943A (en) | Method for extracting fatigue load spectrum of chassis component of whole commercial vehicle | |
| CN105784266A (en) | Docking mechanism test system six-component force on-line calibration method | |
| CN112629878B (en) | Method and device for measuring torsional rigidity of vehicle body | |
| US10675725B2 (en) | Method and test assembly for determining machine parameters | |
| CN115855477A (en) | Device and method for testing robot joint performance | |
| CN115111989A (en) | Comprehensive detection tool for steering knuckle forge piece with pull rod arm | |
| CN110987271B (en) | Three-component force sensor for measuring load at joint of automotive suspension bush | |
| KR101010669B1 (en) | apparatus for inspecting vehicle front carrier | |
| CN114905431B (en) | Positioning device, positioning method and detection method for white car body damping tower | |
| CN114235432B (en) | Multi-source fusion diagnosis method and system for vehicle deviation problem cause | |
| CN216815843U (en) | Comparison type multi-component force sensor calibration device | |
| CN210441777U (en) | Position degree detection tool for automobile parts | |
| CN113319546A (en) | Assembling device, assembling method and batch assembling method | |
| CN118032171A (en) | Method, system and medium for measuring leaf spring support force | |
| CN117664066A (en) | Device and method for measuring angle of space connecting rod | |
| CN214121033U (en) | Automobile tail door frame following detection tool | |
| CN117007299B (en) | Industrial robot processing rigidity detection method and device | |
| CN216050641U (en) | A check out test set for detecting car luggage rack intensity |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |