CN111964578B - Method for establishing finished automobile parameter measurement coordinate system - Google Patents
Method for establishing finished automobile parameter measurement coordinate system Download PDFInfo
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- CN111964578B CN111964578B CN202010729063.6A CN202010729063A CN111964578B CN 111964578 B CN111964578 B CN 111964578B CN 202010729063 A CN202010729063 A CN 202010729063A CN 111964578 B CN111964578 B CN 111964578B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/002—Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates
- G01B11/005—Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates coordinate measuring machines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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Abstract
The invention relates to a method for establishing a finished automobile parameter measurement coordinate system, which comprises the following steps: determining coordinates of a plurality of datum points on the surface of the vehicle body under a datum coordinate system; measuring the coordinates of at least three groups of symmetrical hard points in the bilateral symmetry direction of the vehicle body under a reference coordinate system; creating a Y source plane by using the symmetric centers of the multiple groups of symmetric hard points; randomly taking two points from front to back on a horizontal ground where an automobile is parked to generate a straight line, projecting the straight line to a Y source plane to obtain an X axis, taking the normal direction of the Y source plane as a Y axis, and taking the normal direction of an XY plane as a Z axis; and projecting the wheel center of the front wheel on the side of the driver to a Y source plane, taking the projection point as the origin of a finished automobile measurement coordinate system, and completing the establishment of the finished automobile measurement coordinate system by adopting a point, line and plane method. The invention can not damage the outer surface and the inner decoration of the whole vehicle, and can quickly and accurately acquire the parameter data of the whole vehicle of the sample vehicle.
Description
Technical Field
The invention belongs to the technical field of automobile benchmarking, and particularly relates to a method for establishing a finished automobile parameter measurement coordinate system.
Background
The whole vehicle man-machine parameter measurement of the passenger vehicle is a process of collecting whole vehicle parameter data of a sample vehicle by adopting equipment such as an optical scanner and the like. In the whole vehicle planning and development stage, relevant information of whole vehicle man-machine parameters of competitive vehicle types is researched, so that a target value of a designed vehicle type is set. In order to better establish the target, guide the design of a new vehicle, comprehensively know the relevant information of competing vehicle types, ensure the reliability of the measured data and also ensure the completeness of the measured information. A conventional finished automobile parameter acquisition method comprises the following steps: A. marking points are pasted on the vehicle body, the coded points and the scale are placed, a special camera is used for photographing, a whole vehicle frame is generated by importing the coded points and the scale into software, and an optical scanner is used for scanning point clouds of the whole vehicle; B. and after scanning, generating a curved surface by using reverse software, and extracting the boundary of the whole vehicle and main parts and the size data of the man-machine. The existing optical scanner for collecting the parameters of the whole vehicle has the following problems: 1. the equipment has large requirements on ambient light, and the whole vehicle needs to be sprayed with a developer and stuck with mark points, so the method has large damage to the outer surface and the interior of the whole vehicle; 2. the equipment has large operation space, and some local parts can not be scanned under the condition of no disassembly; 3. the scanning and post-processing time is longer.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for establishing a finished automobile parameter measurement coordinate system, which can solve the problems that the outer surface and the inner decoration of the whole automobile are greatly damaged when a conventional optical scanner is used for measuring the man-machine parameters of the finished automobile, so that expensive cars cannot be measured, and the later data processing time is long.
In order to solve the technical problem, the method for establishing the finished automobile parameter measurement coordinate system comprises the following steps:
step one, arranging a plurality of datum points on the surface of a vehicle body: measuring by using a three-coordinate measuring instrument and a frog kick ball to obtain the coordinates of each datum point under a reference coordinate system; defining a self-contained coordinate system of the three-coordinate measuring instrument as a reference coordinate system when any two reference point positions are measured for the first time;
moving the three-coordinate measuring instrument to measure at least three groups of symmetrical hard point positions in the bilateral symmetry direction of the vehicle body; calculating to obtain the coordinates of the hard point under the reference coordinate system according to the coordinates of any datum point in the measuring range under the auxiliary coordinate system, the coordinates of the hard point under the reference coordinate system and the coordinates of the hard point under the auxiliary coordinate system in each measurement; thus obtaining the coordinates of a plurality of groups of symmetrical hard points under the reference coordinate system; establishing a Y-source plane of a finished automobile parameter measurement coordinate system by using the symmetric centers of the multiple groups of symmetric hard points; defining a coordinate system of the three-coordinate measuring instrument as an auxiliary coordinate system when the three-coordinate measuring instrument is moved and then measured each time;
moving the three-coordinate measuring instrument to the front vehicle door on the driver side, inserting a frog leaping command, measuring three groups of frog leaping balls close to a datum point position of the front vehicle door on the driver side, then using the three-coordinate measuring instrument to randomly take two points from front to back on a horizontal ground where the vehicle is parked to generate a straight line, projecting the straight line to a Y source plane to obtain an X axis, taking the normal direction of the Y source plane as a Y axis, and taking the normal direction of the XY plane as a Z axis;
and step four, measuring the wheel center 3 of the front wheel on the driver side under the design load, projecting the wheel center to a Y source plane, taking the projection point as the origin of the measurement coordinate system of the whole vehicle, and completing the establishment of the measurement coordinate system of the whole vehicle by adopting a point, line and plane method.
Further, in the first step, a plurality of datum points are dispersedly arranged on the surface of the vehicle body, each datum point is provided with a group of frog jump balls, and each group comprises 3 frog jump balls; arranging the three-coordinate measuring instrument at a position close to the vehicle body, and enabling two datum points to be located in the measuring range of the three-coordinate measuring instrument; measuring the frog kick balls of the two datum points by a three-coordinate measuring instrument to obtain the coordinates of the two datum points under a datum coordinate system; moving the three-coordinate measuring instrument to measure the unmeasured datum point position in the measuring range and any datum point position measured in the first step; at the moment, the coordinate system of the three-coordinate measuring instrument is an auxiliary coordinate system, and the coordinate of the unmeasured datum point under the reference coordinate system is calculated according to the coordinate of the unmeasured datum point, the measured datum point under the auxiliary coordinate system in the first step and the coordinate of the measured datum point under the reference coordinate system; and determining the coordinates of the plurality of datum points under the reference coordinate system in the same way.
Further, in the first step, one datum point is respectively arranged near the left front fender, the left rear fender, the right front fender and the right rear fender.
Further, in the second step, three groups of symmetrical hard points are arranged in the bilateral symmetry direction of the vehicle body, and a Y source plane of the whole vehicle parameter measurement coordinate system is established by using the symmetry centers of the three groups of symmetrical hard points.
Further, in the second step, five groups of symmetrical hard points are arranged in the bilateral symmetry direction of the vehicle body, the five groups of symmetrical hard points are measured to obtain coordinates of the five groups of symmetrical hard points under a reference coordinate system, five symmetry centers of the five groups of symmetrical hard points are further obtained, every four symmetry centers form a plane and form five planes together, and any plane with the flatness not exceeding the tolerance requirement is taken as a Y source plane.
Further, in the second step, five groups of symmetrical hard points are arranged in the bilateral symmetry direction of the vehicle body, the five groups of symmetrical hard points are measured to obtain coordinates of the five groups of symmetrical hard points under the reference coordinate system, five symmetry centers of the five groups of symmetrical hard points are further obtained, every four symmetry centers form a plane, five planes are formed by the planes, and any plane with the smallest flatness tolerance is taken as a Y source plane.
And in the second step, a part with a circular part is taken as a measuring element, a coordinate of three points on the circumference under the reference coordinate system is measured by using a three-coordinate measuring instrument, and then the coordinate of the circle center of a circumscribed circle of the three points under the reference coordinate system is obtained and is taken as a hard point.
The invention has the beneficial effects that:
1. the invention eliminates the problem that the whole vehicle needs to be sprayed with developer and stuck with mark points when the conventional optical scanner is used for measuring the man-machine parameters of the whole vehicle, so that the external surface and the internal decoration of the whole vehicle are greatly damaged;
2. the invention establishes the spatial position relationship between the sample car and the three-coordinate measuring instrument by arranging the frog jump ball at different positions of the car, can ensure the relevance of the front data and the rear data,
3. according to the invention, the frog jump ball is arranged to move along with the posture of the vehicle body, so that the measurement data can be converted into a built whole vehicle coordinate system through the frog jump ball when the subsequent equipment or the vehicle load changes.
4. The invention realizes the effect of matching the established coordinate system with the design coordinate system of the whole vehicle, can effectively improve the measurement speed of the parameters and the man-machine dimension of the whole vehicle, can further quickly acquire and accumulate man-machine data of different vehicle types, ensures the product to be referenced, and improves the optimization of the man-machine engineering scheme of a company. The method can solve the problems that when a conventional optical scanner is used for measuring the man-machine parameters of the whole car, the whole car needs to be sprayed with the developer and adhered with the mark points, the damage to the outer surface and the inner decoration of the whole car is large, some expensive cars cannot be measured, and the later-stage data processing time is long. The invention can realize rapid and accurate whole vehicle parameter data acquisition of the sample vehicle.
Drawings
FIG. 1 is a diagram of an embodiment of setting a frog kick point location and establishing a coordinate system base element outside a vehicle;
FIG. 2 is an example of establishing a coordinate system of FIG. 1;
fig. 3 is a three-dimensional measurement result of vehicle parameters.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
The invention relates to a method for measuring parameters of a whole vehicle and establishing a coordinate system, which specifically comprises the following steps:
step one, as shown in fig. 1, determining coordinates of four datum points on a vehicle body under a reference coordinate system:
(1) setting datum points a, b, c and d near the left front fender, the left rear fender, the right front fender and the right rear fender respectively, and setting a group of frog jumping balls at each datum point; each group comprises three frog jumping balls, and the corresponding datum point position is the circle center of a circumscribed circle of the jumping points of the three frog jumping balls;
(2) arranging the three-coordinate measuring instrument at a position close to the vehicle body, enabling two datum points a and b to be in the measuring range of the three-coordinate measuring instrument, and taking the coordinate system of the three-coordinate measuring instrument as a datum coordinate system; inserting a frog leaping command, and measuring the coordinates (x) of two datum points (a and b) under a datum coordinate system by a three-coordinate measuring instrumenta,ya,za)、(xb,yb,zb)；
(3) Moving the three-coordinate measuring instrument to enable the two datum point positions b and c to be in the measuring range of the three-coordinate measuring instrument, taking the coordinate system of the three-coordinate measuring instrument as an auxiliary coordinate system at the moment, inserting a frog leaping command, and measuring the coordinates (x) of the two datum point positions b and c under the auxiliary coordinate system through the three-coordinate measuring instrumentb1,yb1,zb1)、(xc1,yc1,zc1)；
(4) According to the coordinate (x) of the datum point position b under the reference coordinate systemb,yb,zb) In the assistance ofCoordinates (x) in a coordinate systemb1,yb1,zb1) And the coordinate (x) of the datum point position c in the auxiliary coordinate systemc1,yc1,zc1) Calculating to obtain the coordinate (x) of the datum point position c under the datum coordinate systemc,yc,zc)；
Similarly, the coordinate (x) of the datum point position d in the datum coordinate system can be obtainedd,yd,zd)。
Step two, creating a Y source plane:
(1) 5 groups of symmetrical hard points are dispersedly arranged in the bilateral symmetry direction of the vehicle body, and are respectively L1-L5、R1-R5；
(2) Moving the three-coordinate measuring instrument to make the datum point a and the hard point L1-L4In the measuring range, the coordinate system of the three-coordinate measuring instrument is taken as an auxiliary coordinate system; measuring datum point position a and hard point L1-L4Coordinates in the auxiliary coordinate system;
(3) using datum points a and hard points L1-L4Coordinates in the auxiliary coordinate system, and coordinates (x) of the datum point position a in the reference coordinate systema,ya,za) Calculating to obtain a hard point L1-L4Coordinates under a reference coordinate system;
similarly, other hard points L can be obtained by using the datum points b, c and d5And R1-R5Coordinates under a reference coordinate system;
(4) five corresponding symmetric centers are obtained according to coordinates of five groups of symmetric hard points under a reference coordinate system, every four symmetric centers form a plane, five planes are formed by the planes, any plane with flatness not exceeding the tolerance requirement is taken as a Y source plane, any plane with the minimum flatness tolerance is taken as a Y source plane, and the perpendicularity of the Y source plane and the Z source plane can be guaranteed.
The part with a circular part on the vehicle body can be taken as a measuring element, the coordinate of three points on the circumference under a reference coordinate system is measured by a three-coordinate measuring instrument, and then the coordinate of the circle center of a circumscribed circle of the three points under the reference coordinate system is obtained and is taken as a hard point. For example, a member having a circular portion such as a hinge fixing bolt flange circle, a shackle fixing bolt flange circle, or the like may be used as the measuring element.
Moving the three-coordinate measuring instrument to the front door of the driver side, inserting a frog leaping command, measuring three groups of frog leaping balls of the datum point position a, then using the three-coordinate measuring instrument to randomly take two points 2a and 2b from front to back on the horizontal ground where the automobile is parked to generate a straight line 2, projecting the straight line 2 to a Y source plane as an X axis, taking the advancing direction of the automobile as the negative direction, taking the normal direction of the Y source plane as a Y axis, taking the direction right as the positive direction, and generating a Z axis according to a right-hand coordinate system method.
And step four, measuring the wheel center 3 of the front wheel on the driver side under the design load, projecting the wheel center to a Y source plane, taking the projection point as the origin of the measurement coordinate system of the whole vehicle, and completing the establishment of the measurement coordinate system of the whole vehicle by adopting a point, line and plane method. The established measuring coordinate system of the whole vehicle is shown in fig. 2.
The whole vehicle measurement coordinate system is utilized, whole vehicle parameters can be measured, and CATIA software is utilized to perform data processing to generate a man-machine wire-frame diagram. As shown in fig. 3.
In the first step, the number of the datum point positions is determined according to the length of the vehicle body and the length of the measuring arm of the three-coordinate measuring instrument, the vehicle body is longer and wider, and when the measuring arm is shorter, the number of the datum point positions can be increased. For the car body is short and the measuring arm is long, the number of datum points can be reduced, and the measuring requirement can be met.
In the second step, 3 sets of symmetrical hard spots, 4 sets of symmetrical hard spots or 6 sets of symmetrical hard spots may be dispersedly arranged in the bilateral symmetry direction of the vehicle body.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A method for establishing a finished automobile parameter measurement coordinate system is characterized by comprising the following steps:
step one, arranging a plurality of datum points on the surface of a vehicle body: measuring by using a three-coordinate measuring instrument and a frog kick ball to obtain the coordinates of each datum point under a reference coordinate system; defining a self-contained coordinate system of the three-coordinate measuring instrument as a reference coordinate system when any two reference point positions are measured for the first time;
moving the three-coordinate measuring instrument to measure at least three groups of symmetrical hard point positions in the bilateral symmetry direction of the vehicle body; calculating to obtain the coordinates of the hard point under the reference coordinate system according to the coordinates of any datum point in the measuring range under the auxiliary coordinate system, the coordinates of the hard point under the reference coordinate system and the coordinates of the hard point under the auxiliary coordinate system in each measurement; thus obtaining the coordinates of a plurality of groups of symmetrical hard points under the reference coordinate system; establishing a Y-source plane of a finished automobile parameter measurement coordinate system by using the symmetric centers of the multiple groups of symmetric hard points; defining a coordinate system of the three-coordinate measuring instrument as an auxiliary coordinate system when the three-coordinate measuring instrument is moved and then measured each time;
moving the three-coordinate measuring instrument to the front vehicle door on the driver side, inserting a frog leaping command, measuring three groups of frog leaping balls close to a datum point position of the front vehicle door on the driver side, then using the three-coordinate measuring instrument to randomly take two points from front to back on a horizontal ground where the vehicle is parked to generate a straight line, projecting the straight line to a Y source plane to obtain an X axis, taking the normal direction of the Y source plane as a Y axis, and taking the normal direction of the XY plane as a Z axis;
and step four, measuring the wheel center (3) of the front wheel on the driver side under the design load, projecting the wheel center to a Y-source plane, taking the projection point as the origin of the finished automobile measurement coordinate system, and completing the establishment of the finished automobile measurement coordinate system by adopting a point, line and plane method.
2. The method for establishing the finished automobile parameter measurement coordinate system according to claim 1, wherein in the first step, a plurality of datum points are dispersedly arranged on the surface of an automobile body, each datum point is provided with a group of frog jump balls, and each group comprises 3 frog jump balls; arranging the three-coordinate measuring instrument at a position close to the vehicle body, and enabling two datum points to be located in the measuring range of the three-coordinate measuring instrument; measuring the frog kick balls of the two datum points by a three-coordinate measuring instrument to obtain the coordinates of the two datum points under a datum coordinate system; moving the three-coordinate measuring instrument to measure the unmeasured datum point position in the measuring range and any datum point position measured in the first step; at the moment, the coordinate system of the three-coordinate measuring instrument is an auxiliary coordinate system, and the coordinate of the unmeasured datum point under the reference coordinate system is calculated according to the coordinate of the unmeasured datum point, the measured datum point under the auxiliary coordinate system in the first step and the coordinate of the measured datum point under the reference coordinate system; and determining the coordinates of the plurality of datum points under the reference coordinate system in the same way.
3. The method for establishing the finished automobile parameter measurement coordinate system according to claim 2, wherein in the first step, a datum point is respectively arranged near the left front fender, the left rear fender, the right front fender and the right rear fender.
4. The method for establishing the finished automobile parameter measurement coordinate system according to claim 1, wherein in the second step, three groups of symmetrical hard points are arranged in the left-right symmetrical direction of the automobile body, and a Y-source plane of the finished automobile parameter measurement coordinate system is established by using the symmetrical centers of the three groups of symmetrical hard points.
5. The method for establishing the finished automobile parameter measurement coordinate system according to claim 1, wherein in the second step, five groups of symmetrical hard points are arranged in the left-right symmetrical direction of the automobile body, the five groups of symmetrical hard points are measured to obtain coordinates of the five groups of symmetrical hard points under a reference coordinate system, so as to obtain five symmetrical centers of the five groups of symmetrical hard points, every four symmetrical centers form a plane, five planes are formed by the same, and any plane with flatness not exceeding the tolerance requirement is taken as a Y-source plane.
6. The method for establishing the finished automobile parameter measurement coordinate system according to claim 1, wherein in the second step, five groups of symmetrical hard points are arranged in the left-right symmetrical direction of the automobile body, the five groups of symmetrical hard points are measured to obtain coordinates of the five groups of symmetrical hard points under the reference coordinate system, so as to obtain five symmetrical centers of the five groups of symmetrical hard points, every four symmetrical centers form a plane, five planes are formed by the same symmetry, and any plane with the smallest flatness tolerance is taken as a Y-source plane.
7. The vehicle parameter measurement coordinate system establishing method according to claim 1, wherein in the second step, a part having a circular portion is taken as a measurement element, a coordinate of three points on a circumference under a reference coordinate system is measured by a three-coordinate measuring machine, and then a coordinate of a center of a circle circumscribed by the three points under the reference coordinate system is obtained and taken as a hard point.
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| CN113959388A (en) * | 2021-09-30 | 2022-01-21 | 中国第一汽车股份有限公司 | Main welding line trolley consistency detection method |
| CN114166161B (en) * | 2021-11-04 | 2023-06-20 | 东风汽车集团股份有限公司 | Method, device and equipment for establishing white car body measurement coordinate system and readable storage medium |
| CN114322874A (en) * | 2021-12-27 | 2022-04-12 | 浙江吉利控股集团有限公司 | Body-in-white measuring method and system |
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