Method to determine value and direction of deformations of vehicle damaged body at straightening out works

FIELD: mechanical engineering; repair of vehicles.

SUBSTANCE: vehicle with damage body is lifted to preset height relative to floor, and check points on body are chosen. Part of points are arranged of sound part of body. Additional check point is marked on floor under bottom of body. Said point should be located at a distance from bottom not less than one fourth of maximum distance between chosen check points. Distances between all check points are measured, and basing on obtained data, three coordinates of all chosen check points are calculated by computer with determination of distribution of said check points in space. Then, by turning, check points of damage body are registered with similar check points in computer data base belonging to body of standard vehicle. Distribution of check points received in measurement is compared with distribution of check points in standard vehicle and, basing on results of measurement, value and direction of deformations of damaged body are determined.

EFFECT: simplified method at preservation of high accuracy of determination of deformations.

1 ex, 3 tbl, 2 dwg

 

The invention relates to mechanical engineering and can be used in the repair of vehicles at service stations vehicle to determine the nature of deformation of the vehicle.

The known method of controlling the position of points of a body of the vehicle, lying in the same plane, which measure the positions of the points of the deformed body of the car using linear measures of length: tape measure, rulers, calipers and measure distances between points determine the position of points of the body, and the magnitude and direction of deformation of the car body (1).

The disadvantage of this method is the impossibility of obtaining a three-dimensional configuration of points, which reduces the information content of the measurement results, performance and increases the labor costs for the repair of the strain of vehicle.

The known method of controlling the position of points of a body of the vehicle, implemented in the device for controlling the position of the points of the deformed body of the car. This method provides a measure of the position of the control points by using a rotary sensors, frame established by intersecting the axes of the roller and inextensible filaments, one end of which is fixed to the roller, and the other at the control point of the body. Sensors continuously transmit in computer information o n the Board and the length of the elongated filament. Each measured element conveys information about the three coordinates of a single point of the body from a number of controlled reference system associated with the measuring element. Measuring element specifies the coordinates of the points in the spherical coordinate system (2).

The disadvantage of this method is the complexity of the necessity of using a large number of measuring elements and as a consequence of the high cost of equipment for controlling the position of points of a body of the vehicle.

Closest to the invention is a method of controlling the position of points of a body of the vehicle, which define the distance between two measuring elements, which use the laser emitters of the type installed on the matrix and connected to the sensors of rotation in two planes. Bring both beam on one reference point of the body, mentally projecting it on the horizontal plane, build a virtual pyramid, determine the angle between one of the beams and its projection on the horizontal plane and the angle between the projections on the horizontal plane and determine the spatial coordinates of a given point of the body in the given coordinate system. Then put both of the beam at the second point of the body and determine the spatial coordinates of the second point of the body similarly p is pout point, define the distance between two points in three dimensions, which are compared to the reference size. According to the results of the comparisons determine the position of points of the body and this status is determined by the nature of the deformation of the car body (3).

The disadvantage of this method is its complexity due to the use for measuring the coordinates of control points of a special matrix for fastening the measuring elements, and the low accuracy of determining the position of points due to the complexity of visual coincidence of the two beams.

The technical result of the invention is to simplify the method of determining the magnitude and direction of deformation of the damaged body of the vehicle when editing while maintaining the high accuracy of determining the position of points.

This result is achieved in that in the method of determining the magnitude and direction of deformation of the damaged body of the vehicle when editing the vehicle is lifted to a predetermined height relative to the floor, choose control points, some of which are located on the undamaged portion of the underbody of the car body on the floor celebrate an additional control point spaced from the bottom at a distance of not less than one-fourth the maximum distance between control points, measure the distance between all the completed points, enter the values of the measured distances in the database of the computer on which basis by computing the computer unit calculates the three coordinates of all selected control points relative to a given coordinate system, and determine the distribution of these control points in space, by turning combine the obtained distribution of the control points of the body of the vehicle stored in the computer database of the distribution is similar to checkpoint the reference vehicle, compare the distribution of the control points of the body of the vehicle with the distribution of control points of the reference vehicle and the results of the comparison determine the magnitude and direction of deformation of the body of the vehicle.

The possibility of the method of determining the position of points of a body of a vehicle consider the example of determining the position of points of the deformed body of the car.

Figure 1 presents the distribution of the control points of a body in the reference vehicle, stored in the computer database.

Figure 2 - spatial distribution of selected control points in the deformed body of the car.

According to this invention a method of determining the nature on the formation of the body of the car is as follows.

Set the vehicle on a hoist or special stocks. Raise the vehicle to a predetermined height above the floor. Based on the nature of the deformity, choose a reference point on the bottom of the deformed body of the vehicle from the number of control points 1-21 and 11-211listed in the database of the computer (figure 1). Some of them not less than 3 - opt on the undamaged portion of the vehicle body for spatial reference points of the deformed body of the vehicle to the position of the points of a body in the reference vehicle, information of which is stored in the computer database.

Note on the floor under the bottom of the deformed body of the vehicle an additional control point 22. An additional point is chosen at a distance from the bottom of the deformed body of the vehicle not less than one-fourth the maximum distance between the control points of the deformed body of the car.

With the help of measuring tools, such as electronic telescopic line with the probes on the ends, measure all mutual distances between the selected control points. The measurement results are entered into the computer, to avoid error, it is possible with manual input, it is better to use the direct transfer of data from the meter to the computer for example via a cable or radio.

You run hiliterow procedure for finding the three-dimensional distribution of control points in space in accordance with one of the known methods, for example, in accordance with the method of gradient descent (Kalitkin NN. Numerical methods. M.: Nauka, 1978). As a first approximation in the mathematical model in Cartesian coordinates define the "ideal" control points taken from the database of the computer. The program then starts a cyclic traversal of all points of the mathematical model, in turn, for the sample by changing the coordinates of each point on the small size. After each change of coordinates of control points of the mathematical model compares all actually measured distances and the corresponding distances calculated by the points of the mathematical model, and calculates the error. If in the course of the trial displacement of this point, the total error is reduced, this displacement is fixed. If the error has increased, the displacement is performed in the opposite direction. Then moves to the next control point mathematical models, etc. Bypassing all points is repeated until such time as calculated by the model of distance does not coincide with the actually measured. Obtained in this configuration points to be identical in shape to the configuration of the points measured on the model, but can be located in space arbitrarily. Therefore, it is necessary to rotate and align with the reference configuration so that the control points of the body intact h is STI car coincided with the reference as it is possible more precisely.

Obtained the actual location of the control points in space is compared with a reference and the position of the points is determined by the magnitude and direction of deformation of the body.

As an example, the above method of determining the nature of the deformity was conducted with the use of the car HONDA SHUTTLE CR-V, which is mounted on the frame at a predetermined height from the floor.

Figure 1 presents the distribution stored in the computer database.

In the database presents the distribution of control points 1-21 body base reference specified car brand in the right pane (figure 1). Similar control points are located in the left part of the car body. Suppose that damaged the front part of the body to the left. Opt for measurements checkpoint 3, 12, 15 on the right side of the body and similar point 3', 12', 15'. When this right points 3, 12, 15 and left point 12', 15' is selected on the undamaged portion of the vehicle body, and the left point of the 3' to the damaged front of the body.

From the database were obtained three-dimensional coordinates of these points on the Cartesian coordinate system, which are summarized in table 1.

Table 1
No.XYZ
3'273 500167
32732-500167
12'1480409135
121480-409135
15'0643204
150-643204

In accordance discussed above under the car at a distance of about 1 meter was on the floor marked with additional control point 22 (figure 2).

Were measured distances between all the above control points, the measurement results are listed in table 2.

Table 2
PointsDistance
3'-3954
3'-12'1171
3'-121452
3'-15'2657
3'-152867
3'-221646
3-12'1548
3-121256
3-15'2962
3-152736
3-221719
12'-12818
12'-15'500
12'-151817
12'-221113
12-15'1817
12-151500
12-221113
15'-221286
15'-221955
15-221955

On the basis of these measured distances between the control points using the method of gradient descent" were calculated real coordinates all seven control points with respect to the selected Cartesian coordinate system X, Y, Z, and the obtained three-dimensional distribution of the control points of the deformed body of the car, which was rotated so that the four selected control point 12, 15 and 12', 15' better coincided with similar reference points the reference vehicle (figure 1). This has resulted in the following coordinates of the specified points of the deformed car listed in table 3.

Table 3
No.XYZ
3'2650450166
32732-499166
12'1480409135
121480-408135
15'0643204
150-642204
2214800-849

From table 3 it can be seen that the checkpoint 3, 12, 12', 15, 15', located on the undamaged part of the body deformed cars, managed to combine with the control points of the reference vehicle with an accuracy of 1 mm, and the problematic point 3', located on the deformed part of the body of the car has deviated from its true location back to the value 2732-2650=82 mm and to the right by the amount 500-450=50 mm, the Deviation of the Z-axis, i.e. vertically in this example did not happen, because the change of the Z-coordinates of 1 mm is placed in measurement errors.

On the basis of the results obtained decides in which direction and with what force should edit the damage of the car body.

This example allows you to ensure that to determine the nature of deformation of the car body does not require any additional means for obtaining three-dimensional distribution of the control points of the deformed body of the vehicle, while ensuring a sufficiently high accuracy in the op is edelenyi nature of the injury, that reduces the labor involved in carrying out edits the body of the car.

Sources of information

1. Acceptance, repair and production of car body repairs cars enterprises repair shop". RD 37.009.024-92, 1992, Moscow, JSC avtoselhozmash-holding.

2. Copyright certificate EN 1706742 A2, IPC 7 21D 1/12, publ. 23.01.2002.

3. Patent RU 2239505 C1, IPC 7 21D 1/12, publ. 10.11.2004.

The method of determining the magnitude and direction of deformation of the damaged body of the vehicle when dressing, characterized in that the vehicle with damaged body raised to a predetermined height relative to the floor, choose a reference point on his body, part of which is located on the undamaged portion of the underbody of the car body on the floor celebrate an additional control point spaced from the bottom at a distance of not less than one-fourth the maximum distance between control points, measure the distance between all control points, put the values of the measured distances in the database of the computer on which basis by computing the computer unit calculates the three coordinates of all selected the control points relative to a given coordinate system, and determine the distribution of these control points in space, by turning combine the received distributed the e checkpoint damaged body stored in the computer database of the distribution is similar to the control points of a body in the reference vehicle, compare the distribution of the control points of the damaged body with the distribution of the control points of a body in the reference vehicle and the results of the comparison determine the magnitude and direction of deformation of the damaged body.



 

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