阅读说明：本技术 一种竞品车逆向工程中座椅基准点的确定方法 (Method for determining seat reference point in reverse engineering of competitive product vehicle ) 是由 张营 朱松 杜天强 王坤 张洪涛 王伟 曲辅凡 于 2020-05-27 设计创作，主要内容包括：本发明提供了一种竞品车逆向工程中座椅基准点的确定方法,包括以下步骤：S1、利用摄影测量系统对待测车辆外表面进行全局定位摄影测量；S2、将步骤S1得到的三维空间坐标数据输入到三维扫描测量仪系统,利用光学拍照定位技术和光栅测量原理进行外表面三维点云数据采集,得到待测车辆整车外表面点云数据；S3、利用三维结构设计软件对整车外表面点云数据进行处理分析,通过坐标转换,限制六向自由度进而确定整车基准坐标系；S4、采集待测车辆内部点云数据,并对点云数据进行处理,借助计算机辅助处理分析,得到座椅基准点。本发明所述的竞品车逆向工程中座椅基准点的确定方法为竞品车逆向工程中座椅基准点的确定提供了一种规范及标准的工作流程。(The invention provides a method for determining a seat reference point in a reverse engineering of a competitive product vehicle, which comprises the following steps: s1, carrying out global positioning photogrammetry on the outer surface of the vehicle to be measured by using the photogrammetry system; s2, inputting the three-dimensional space coordinate data obtained in the step S1 into a three-dimensional scanning measuring instrument system, and acquiring external surface three-dimensional point cloud data by using an optical photographing positioning technology and a grating measuring principle to obtain external surface point cloud data of the whole vehicle to be measured; s3, processing and analyzing the cloud data of the points on the outer surface of the whole vehicle by using three-dimensional structural design software, and limiting six-direction freedom degrees through coordinate conversion to further determine a reference coordinate system of the whole vehicle; and S4, collecting point cloud data inside the vehicle to be detected, processing the point cloud data, and obtaining the seat reference point by means of computer-aided processing and analysis. The method for determining the seat reference point in the competitive product vehicle reverse engineering provides a standard working process for determining the seat reference point in the competitive product vehicle reverse engineering.)

1. A method for determining a seat reference point in a reverse project of a competitive products vehicle is characterized by comprising the following steps:

s1, carrying out global positioning photogrammetry on the outer surface of the vehicle to be measured by using the photogrammetry system so as to obtain three-dimensional space coordinate data of the outer surface of the whole vehicle of the vehicle to be measured;

s2, inputting the three-dimensional space coordinate data obtained in the step S1 into a three-dimensional scanning measuring instrument system, and acquiring external surface three-dimensional point cloud data by using an optical photographing positioning technology and a grating measuring principle to obtain external surface point cloud data of the whole vehicle to be measured;

s3, processing and analyzing the cloud data of the points on the outer surface of the whole vehicle by using three-dimensional structural design software, and limiting six-direction freedom degrees through coordinate conversion to further determine a reference coordinate system of the whole vehicle;

and S4, collecting point cloud data inside the vehicle to be detected, processing the point cloud data, and obtaining the seat reference point by means of computer-aided processing and analysis.

2. The method for determining the seat reference point in the reverse engineering of the competitive products vehicle as claimed in claim 1, wherein: and the photography measurement system in the step S1 is a finished vehicle Tritop global photography measurement system.

3. The method for determining the seat reference point in the reverse engineering of a competitive sports car as claimed in claim 1, wherein the specific implementation method of step S1 is as follows:

firstly, pasting masking paper on the black edge of the whole vehicle windshield, then spraying a developer, covering a whole vehicle light-permeable and high-reflection part, pasting a reference point, uniformly distributing coding points, and arranging a first proportional scale and a second proportional scale; the method comprises the steps that a specific camera of a photogrammetric system is used for completing the acquisition of a first scale by adopting a four-frame photographing method, and then the whole outer surface of the vehicle is continuously photographed according to the upper, middle and lower sequence; in the photographing process, at least 5 codes and reference points appear in each picture, at least 3 common code reference points exist in two continuous pictures, then all the photographed pictures are imported into system software, the positions of all the reference points are accurately positioned through the calculation of the system software, and a three-dimensional space point set on the outer surface of the whole vehicle is formed and output in a refx format.

4. The method for determining the seat reference point in the reverse engineering of the competitive products vehicle as claimed in claim 1, wherein: in the step S2, the three-dimensional scanning measurement instrument system includes a grating projection unit, an image acquisition card, a workstation computer, and two CCD cameras respectively disposed on two sides of the vehicle to be measured and connected to the workstation computer;

the execution method of the three-dimensional scanning measuring instrument system comprises the following steps:

the method comprises the steps that a grating projection unit projects a plurality of specifically coded structured lights onto a vehicle to be detected during scanning, two CCD cameras forming a certain included angle synchronously acquire corresponding images, then the images are decoded and subjected to phase calculation, the spatial three-dimensional coordinate values of pixel points in a common visual area of the two CCD cameras are calculated by utilizing a matching technology and a triangle measurement principle, and a scanning measuring instrument positions scanned point cloud data according to the reference points because the three-dimensional coordinate data of the reference points are determined.

5. The method for determining the seat reference point in the reverse engineering of the competitive products vehicle as claimed in claim 4, wherein: in the step S4, the three-dimensional scanning measurement instrument system is used to measure the point cloud data inside the vehicle, including the three-dimensional point cloud data of the glass black edge, the dummy gesture, and the interior.

6. The method for determining the seat reference point in the reverse engineering of the competitive products vehicle as claimed in claim 4, wherein: the method for collecting point cloud data in the vehicle to be measured in the step S4 is as follows:

s401, placing a dummy in front of a seat, and adjusting a vehicle chassis to be in a horizontal state by using a jack and a laser level meter; adjusting a main driving seat to the last lowest position, placing a seat plate of a three-dimensional H-point device on the seat, pushing the seat plate backwards to the last position, moving the seat plate leftwards and rightwards to adjust the seat plate until bubbles of a bubble level meter are centered, loosening a trunk hinge mechanism when loading the three-dimensional H-point device, loading balancing weights outwards and upwards from H points, preventing the three-dimensional H-point device from toppling and separating from the seat, stamping the three-dimensional H-point device twice by using 100N force through a push-pull force meter on a corresponding load application point before loading each round of balancing weights, so that the three-dimensional H-point device is completely and tightly contacted with the seat in the loading process, and checking whether the three-dimensional H-point device is horizontal or not in;

s402, sequentially placing legs and shoes of a three-dimensional H-point device according to a standard on the premise that a pedal is not pressed down, striking a horizontal laser line on one end of a cushion shaft, namely an H-point hinge shaft, of the three-dimensional H-point device, vertically placing a steel plate ruler on a carpet beside the heel of the three-dimensional H-point device shoes, and adjusting the backrest angle of a seat to be 25 degrees if the reading of the horizontal laser line on the steel plate ruler is smaller than or equal to 290 mm; otherwise, the backrest angle is 23 degrees;

and S403, after the dummy posture point cloud data is acquired, adjusting the main driving seat to be in the last lowest state, keeping the backrest angle of the seat unchanged, and acquiring the interior decoration point cloud data through a photogrammetry system and a three-dimensional scanning measuring instrument system.

7. The method for determining the seat reference point in the reverse engineering of the competitive products vehicle as claimed in claim 5, wherein: the acquired point cloud data inside the vehicle to be detected also needs to be processed, and the processing comprises denoising, cavity repairing, smoothing and filtering.

8. The method for determining the seat reference point in the reverse engineering of the competitive products vehicle as claimed in claim 6, wherein: in step S4, after the point cloud data is collected, the method for determining the seat reference point includes:

transferring multi-state point cloud data of the seat dummy, analyzing to obtain the position of each dummy state H point, projecting the H points onto the plane of the trunk line of the three-dimensional H point device, connecting the H points to obtain a seat motion track curve, referring to the point cloud of the dummy in the last lowest state of the seat, preliminarily determining the placement of a human body model, outputting a seat suitable line according to the three-dimensional space coordinates of a pedal point, a heel point and the H point in the preliminarily determined human body model, initially determining a seat reference point by taking 95% of the seat suitable line and a seat motion track line, respectively intersecting the points V1 and V2 according to the initially determined seat reference point and determining the back angle of the seat, obtaining wind window glass reference points a, b and c by intersecting the V1 point with a straight line horizontally deviating from the left 17 degrees, the V1 point forwards along the vertical plane upwards by 7 degrees and the V2 point forwards along the vertical plane by 5 degrees with the black edge point cloud of the wind window glass to obtain wind window glass reference points a, b and c, and requiring that the wind window glass reference point, and b, moving the seat reference point according to the requirement to meet the standard, obtaining the determined seat reference point at the moment, and analyzing and checking the competitive product vehicle dummy engineering parameters through the R point.

Technical Field

The invention belongs to the technical field of automobile industry, and particularly relates to a method for determining a seat reference point in reverse engineering of a racing car.

Background

The automobile chassis, dynamic performance, NVH performance and the like can be identified through dynamic and specific working conditions, and the human engineering relates to human correlation, generally speaking, only static sensing is needed, and the identification is very easy. However, with the wide use of automobiles, high requirements for riding comfort, maneuverability and the like are required, and the quality of ergonomics in automobile design relates to the production and sales volume of one automobile, so that whether one automobile is developed successfully or not is determined. Therefore, the basis of automobile ergonomics is required to be made, namely, the seat reference point (R point) of the competitive vehicle is required to be accurate.

At present, in the process of determining the seat reference point in the human-computer engineering of the competitive products vehicle in each large host factory in China, the main problem is the diversification of data processing and analyzing methods, and most of the data processing and analyzing methods are analyzed according to respective experience methods of designers. However, the design engineer has strong personal subjective experience, and lacks standardization and consistency of data acquisition, processing and analysis, so that a certain deviation is generated in an analysis result, and the determination of the R point is deviated, thereby influencing later forward development to a certain extent. In summary, there is an urgent need to develop a method for determining R points in a standardized bidding vehicle reverse engineering, so as to provide a more accurate and consistent reference for bidding design of a competitive bidding vehicle.

Disclosure of Invention

In view of the above, the present invention aims to provide a method for determining seat reference points in a reverse engineering of a competitive product vehicle, so as to solve the problem that the determination method of seat reference points in the reverse engineering of the current competitive product vehicle lacks standardization and consistency, and the R points of the competitive product vehicle are obtained by performing standardized acquisition on three-dimensional point cloud data of the competitive product vehicle by means of a three-dimensional optical scanning measurement system and performing standardized computer processing analysis at a later stage, so as to finally provide more accurate and consistent reference for forward bidding design of an enterprise.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a method for determining a seat reference point in a reverse project of a competitive products vehicle comprises the following steps:

s1, carrying out global positioning photogrammetry on the outer surface of the vehicle to be measured by using the photogrammetry system so as to obtain three-dimensional space coordinate data of the outer surface of the whole vehicle of the vehicle to be measured;

s2, inputting the three-dimensional space coordinate data obtained in the step S1 into a three-dimensional scanning measuring instrument system, and acquiring external surface three-dimensional point cloud data by using an optical photographing positioning technology and a grating measuring principle to obtain external surface point cloud data of the whole vehicle to be measured;

s3, processing and analyzing the cloud data of the points on the outer surface of the whole vehicle by using three-dimensional structural design software, and limiting six-direction freedom degrees through coordinate conversion to further determine a reference coordinate system of the whole vehicle;

and S4, collecting point cloud data inside the vehicle to be detected, processing the point cloud data, and obtaining the seat reference point by means of computer-aided processing and analysis.

Further, the photogrammetry system in step S1 is a complete vehicle Tritop global photogrammetry system.

Further, the specific implementation method of step S1 is as follows:

firstly, pasting masking paper on the black edge of the whole vehicle windshield, then spraying a developer, covering a whole vehicle light-permeable and high-reflection part, pasting a reference point, uniformly distributing coding points, and arranging a first proportional scale and a second proportional scale; the method comprises the steps that a specific camera of a photogrammetric system is used for completing the acquisition of a first scale by adopting a four-frame photographing method, and then the whole outer surface of the vehicle is continuously photographed according to the upper, middle and lower sequence; in the photographing process, at least 5 coding reference points appear in each picture, at least 3 common coding reference points exist in two continuous pictures, then all the photographed pictures are imported into system software, all the reference point positions are accurately positioned automatically through calculation of the system software, and a three-dimensional space point set on the outer surface of the whole vehicle is formed and output in a refx format.

Further, in step S2, the three-dimensional scanning measurement instrument system includes a grating projection unit, an image acquisition card, a workstation computer, and two CCD cameras respectively disposed on two sides of the vehicle to be measured and connected to the workstation computer;

the execution method of the three-dimensional scanning measuring instrument system comprises the following steps:

the method comprises the steps that a grating projection unit projects a plurality of specifically coded structured lights onto a vehicle to be detected during scanning, two CCD cameras forming a certain included angle synchronously acquire corresponding images, then the images are decoded and subjected to phase calculation, the spatial three-dimensional coordinate values of pixel points in a common visual area of the two CCD cameras are calculated by utilizing a matching technology and a triangle measurement principle, and a scanning measuring instrument positions scanned point cloud data according to the reference points because the three-dimensional coordinate data of the reference points are determined.

Further, in step S4, the three-dimensional scanning measuring instrument system is used to measure the point cloud data inside the vehicle, including the three-dimensional point cloud data of the glass black edge, the dummy gesture, and the interior.

Further, the method for collecting point cloud data of the interior of the vehicle to be detected in step S4 is as follows:

s401, placing a dummy in front of a seat, and adjusting a vehicle chassis to be in a horizontal state by using a jack and a laser level meter; adjusting a main driving seat to the last lowest position, placing a seat plate of a three-dimensional H-point device on the seat, pushing the seat plate backwards to the last position, moving the seat plate leftwards and rightwards to adjust the seat plate until bubbles of a bubble level meter are centered, loosening a trunk hinge mechanism when loading the three-dimensional H-point device, loading balancing weights outwards and upwards from H points, preventing the three-dimensional H-point device from toppling and separating from the seat, stamping the three-dimensional H-point device twice by using 100N force through a push-pull force meter on a corresponding load application point before loading each round of balancing weights, so that the three-dimensional H-point device is completely and tightly contacted with the seat in the loading process, and checking whether the three-dimensional H-point device is horizontal or not in;

s402, sequentially placing legs and shoes of a three-dimensional H-point device according to a standard on the premise that a pedal is not pressed down, striking a horizontal laser line on one end of a cushion shaft, namely an H-point hinge shaft, of the three-dimensional H-point device, vertically placing a steel plate ruler on a carpet beside the heel of the three-dimensional H-point device shoes, and adjusting the backrest angle of a seat to be 25 degrees if the reading of the horizontal laser line on the steel plate ruler is smaller than or equal to 290 mm; otherwise, the backrest angle is 23 degrees;

and S403, after the dummy posture point cloud data is acquired, adjusting the main driving seat to be in the last lowest state, keeping the backrest angle of the seat unchanged, and acquiring the interior decoration point cloud data through a photogrammetry system and a three-dimensional scanning measuring instrument system.

Further, the acquired point cloud data inside the vehicle to be detected needs to be processed, and the processing includes denoising, cavity repairing, smoothing and filtering.

Further, in step S4, after the point cloud data is collected, the method for determining the seat reference point includes:

transferring multi-state point cloud data of the seat dummy, analyzing to obtain the position of each dummy state H point, projecting the H points onto the plane of the trunk line of the three-dimensional H point device, connecting the H points to obtain a seat motion track curve, referring to the point cloud of the dummy in the last lowest state of the seat, preliminarily determining the placement of a human body model, outputting a seat suitable line according to the three-dimensional space coordinates of a pedal point, a heel point and the H point in the preliminarily determined human body model, initially determining a seat reference point by taking 95% of the seat suitable line and a seat motion track line, respectively intersecting the points V1 and V2 according to the initially determined seat reference point and determining the back angle of the seat, obtaining wind window glass reference points a, b and c by intersecting the V1 point with a straight line horizontally deviating from the left 17 degrees, the V1 point forwards along the vertical plane upwards by 7 degrees and the V2 point forwards along the vertical plane by 5 degrees with the black edge point cloud of the wind window glass to obtain wind window glass reference points a, b and c, and requiring that the wind window glass reference point, and b, moving the seat reference point according to the requirement to meet the standard, obtaining the determined seat reference point at the moment, and analyzing and checking the competitive product vehicle dummy engineering parameters through the R point.

Compared with the prior art, the method for determining the seat reference point in the reverse engineering of the competitive products vehicle has the following advantages:

(1) the method for determining the seat reference point in the reverse engineering of the competitive product vehicle solves the problems that the prior method for determining the seat reference point in the reverse engineering of the competitive product vehicle lacks standardization and consistency, data cannot be transversely benchmarked and the like, and provides a whole set of method for acquiring, processing and analyzing test data for determining the initial conditions of the vehicle and equipment, lists and specifications of data acquisition, processing and analysis, computer-aided processing and analysis specification flow and the like, thereby providing a standard working flow for determining the seat reference point in the reverse engineering of the competitive product vehicle.

(2) The method for determining the seat reference point in the reverse engineering of the competitive product vehicle can ensure the standardization and consistency of data acquisition, processing and analysis of the competitive product vehicle, thereby ensuring the consistency of the reference of analysis output parameters, perfecting the transverse contrast of total arrangement data between bidding vehicle types and providing technical support for reverse bidding and forward design of enterprises.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a flowchart of a method for determining a seat reference point in a competitive bidding reverse engineering according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of basic three-dimensional point cloud data acquisition in a reverse project of a racing car according to the present invention;

FIG. 3 is a schematic diagram of computer-aided processing analysis in reverse engineering of a racing car according to the present invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

A method for determining a seat reference point in a competitive product vehicle reverse engineering comprises the following steps (as shown in figure 1):

(1) preparing for cleaning data acquisition instrument equipment and vehicles;

(2) carrying out global positioning photogrammetry on the outer surface by adopting a Tritop digital photogrammetry system to obtain three-dimensional space coordinate data of the outer surface of the whole vehicle, and simultaneously carrying out precision calibration on a three-dimensional optical scanner;

(3) outputting the three-dimensional space point set of the reference point to a scanner, and acquiring the three-dimensional point cloud data of the outer surface by an optical photographing positioning technology and a grating measurement principle to obtain the point cloud data of the outer surface of the whole vehicle;

(4) and performing coordinate conversion through three-dimensional structure design software to determine the reference coordinate system of the whole vehicle. Then collecting point cloud data of the interior trim, the glass black edge, the seat dummy state and the like of the whole vehicle;

(5) preprocessing the acquired three-dimensional data, wherein the preprocessing mainly comprises the processing of point cloud denoising hole repairing, fairing, filtering and the like;

(6) and (3) checking by means of computer-aided processing analysis and combining SAE J1100-2009 (R) Motor vehicle dimensions standards to obtain a seat datum point, and checking the general arrangement in various aspects through the point to obtain various parameters of the general arrangement of the competitive product vehicle.

The three-dimensional point cloud data acquisition is mainly carried out by means of a three-dimensional optical scanning measurement system, and the system mainly comprises a finished vehicle Tritop digital photogrammetry system and a three-dimensional scanning measurement instrument system.

First, the Tritop digital photogrammetry system is a high-performance digital photogrammetry system for inspecting accurate spatial coordinate values and dimensions of a test object. The method has the main function of providing a spatial three-dimensional coordinate value of a measured object for avoiding iterative accumulation of point cloud splicing errors in the scanning process of a later scanner. The method comprises the steps of placing coding points, reference points, a scale and the like on the surface of an object to be measured, shooting the surface of the object to be measured in a multi-angle full-coverage mode through a specially-arranged high-resolution digital camera, ensuring that at least 3 common coding points exist in two continuous pictures in the shooting process, and placing the coding points, the reference points, the scale and the like without position movement. All the shot pictures are imported into equipment software, and the space relative coordinate values of the mark points (reference points, coding points and the like) can be automatically and accurately measured and recorded through software calculation, so that the space coordinates of the reference points on the surface of the measured object in the same reference coordinate system are obtained.

And the three-dimensional scanning measuring instrument system consists of a left industrial-grade CCD camera, a right industrial-grade CCD camera, a grating projection unit, an image acquisition card, a workstation computer and the like with high resolution. During scanning, the grating projection device projects a plurality of specifically coded structured lights onto an object to be detected, two CCD cameras forming a certain included angle synchronously acquire corresponding images, then the images are decoded and subjected to phase calculation, and spatial three-dimensional coordinate values of pixel points in a common visual area of the two CCD cameras are calculated by utilizing a matching technology and a triangle measurement principle. Because the space position of each reference point is fixed, the scanning measuring instrument can position the scanned point cloud according to the reference points, automatic splicing of the two scanning point clouds is realized, and meanwhile, the scanning measuring instrument can be moved to any position of a measured object with the previously positioned reference point at will to perform high-speed scanning, so that the problem of splicing deviation of the point cloud data of the scanned object is avoided, redundancy and repeated data are reduced, and the integral measuring precision is higher.

The computer-aided data processing and analysis mainly comprises the steps of determining a coordinate system of the whole vehicle by means of calculation processing of three-dimensional software according to collected three-dimensional point cloud data and referring to relevant standards, and ensuring data reference consistency. Under a determined coordinate system, a seat track line is obtained through software calculation processing, the position of a human body model is preliminarily determined by referring to the last lowest point cloud state of the seat, three-dimensional space coordinates of a stepping point, a heel point and an H point are obtained according to the preliminarily determined state of the human body model, so that seat suitable lines (2.5%, 5%, 10%, 50%, 90%, 95% and 97.5% of total 7 seat suitable curves) are output, the seat reference point is preliminarily determined by taking 95% of the seat suitable lines and the seat motion track line, and finally the coordinates of the seat reference point are finally determined through wind window vision checking.

As shown in fig. 2, a three-dimensional space coordinate value of a reference point (including a reference point with or without a code) arranged on a finished automobile is acquired by a finished automobile Tritop global photogrammetry system by using a specific camera and a calibration scale, and finally, three-dimensional point cloud data of the outer surface of the finished automobile, a glass black edge, a dummy posture and an interior are acquired by a blue light scanner.

(1) Firstly, pasting masking paper on the black edge of the whole vehicle windshield, then spraying a developer, covering a whole vehicle light-permeable and high-reflection part, pasting a reference point, uniformly distributing coding points (cross coding points), and putting a first proportional scale and a second proportional scale, wherein the proportional scale is used for calculating the actual size of a measured object and carrying out space positioning by taking pictures through a specific camera according to the standard size of the proportional scale and combining the reference point and the coding points. The specific camera is used for completing the acquisition of a first scale through four photographing methods (up, down, left and right), and then the whole outer surface of the automobile is photographed continuously from top to bottom. In the photographing process, at least 5 coding reference points appear in each picture, at least 3 common coding reference points exist in two continuous pictures, then all the photographed pictures are imported into software, the positions of all the reference points are accurately positioned automatically through software calculation, a three-dimensional space point set on the outer surface of the whole vehicle is formed, and a refx format is output;

(2) the blue light scanner verifies the scanning precision of the equipment through an 18-step calibration method, and then the acquired point set in the refx format is imported into scanner software, so that the system can accurately and automatically splice a single scanning into a unified coordinate system on the basis of the point set. Removing the masking paper adhered to the glass black edge before scanning, and finally completing point cloud data acquisition and output of the outer surface of the whole vehicle and the glass black edge in stl format;

(3) before the dummy is placed, 4 jacks are arranged at the lower side beam of the vehicle chassis to jack the vehicle, and the laser level meter is used for ensuring that the vehicle chassis is in a horizontal state. The main driving seat is adjusted to the last lowest position (the lowest seat cushion), a seat plate of a three-dimensional H-point device (HPM-II, namely an H-point measurement dummy which is mainly used for determining and positioning standard seat reference data and leg, foot and pedal position reference points) is placed on the seat, the seat plate is pushed backwards to the last position, and the seat plate is adjusted in a left-right mode until bubbles of the bubble level meter are centered. When HPM-II is loaded, the trunk hinge mechanism is loosened, and the balancing weight is loaded outwards and upwards from the point H, so that the HPM-II is prevented from falling and being separated from the seat. Before each wheel of the counterweight is loaded, punching twice with 100N force by a push-pull force meter at the corresponding load application point, so that the HPM-II is completely and closely contacted with the seat in the loading process, and whether the HPM-II is horizontal or not is checked in the loading process, wherein the sequence of loading weights is as follows:

and on the premise that the pedal is not pressed down, sequentially placing the legs and the shoes of the HPM-II according to the standard. A horizontal laser line is arranged at one end of a cushion shaft (H point hinged shaft) of an H point device, a steel plate ruler is vertically arranged on a carpet beside the heel (heel point) of the H point device shoe, and if the reading (H30) of the horizontal laser line on the steel plate ruler is less than or equal to 290mm, the angle of the backrest of the seat is adjusted to be 25 degrees; otherwise, the backrest angle is 23 °.

The seat scanning states are as follows:

main driving seat	8 state-seat cushion is not adjustable	12 state-seat cushion adjustable
			1	The last lowest seat	Lowest final seat-lowest cushion
2	At the end of the seat 1/3	Last lowest-middle of cushion of seat
			3	At the end of the seat 2/3	Last lowest seat-uppermost cushion
4	Last and uppermost seat	Seat last 1/3 Upper-seat cushion mostOn the upper part
			5	Chair foremost and upmost	Seat last 2/3 Upper-seat uppermost
6	At the forefront 2/3 of the seat	Last top seat-top cushion
			7	At the forefront 1/3 of the seat	Seat foremost and upmost-seat cushion upmost
8	The chair is foremost and bottommost	The foremost and uppermost part of the chair-the middle of the cushion
			9	----	Seat foremost and upmost-seat cushion downmost
10	----	Seat front 2/3 upper-cushion bottom
			11	----	Seat front 1/3 upper-cushion bottom
12	----	Seat front lowest-cushion lowest

After the data acquisition of the dummy is finished, the main driving seat is adjusted to be in the last lowest state, the angle of the backrest of the seat is kept unchanged, and the interior decoration point cloud data are acquired through Tritop photogrammetry and a blue light scanner. And (4) processing and analyzing the point cloud data (denoising, hole repairing, smoothing, filtering and the like). So far, all basic three-dimensional point cloud data related to determining the seat reference points are acquired.

Referring to fig. 3, the collected point cloud data is processed and analyzed by computer three-dimensional software, and a full-vehicle reference coordinate system (a longitudinal symmetry plane of the vehicle is a Y reference plane, a horizontal plane passing through the center of the front wheel and perpendicular to the Y plane is an X reference plane, and a horizontal plane passing through the center of the front wheel and perpendicular to the X and Y reference planes is a Z reference plane) is determined by coordinate transformation and limiting six-way degrees of freedom.

Referring to fig. 3, a chair dummy multi-state point cloud is called, the H point positions of all dummy states are obtained through analysis and are projected onto the plane where the trunk line of the three-dimensional H-point device is located, a chair motion track curve (H point stroke) is obtained through connection among the H points, the point cloud placement of the dummy in the last lowest state of the chair is referred, and the human body model placement is preliminarily determined. According to the preliminarily determined three-dimensional space coordinates of the stepping point, the heel point and the H point in the human body model, a seat suitable line is output, 95% of the seat suitable line and a seat motion trajectory line are used for initially determining a seat reference point, according to the initially determined seat reference point and the determined seat back angle, V1 and V2 points are obtained, the V1 points are horizontally deviated from the left 17 degrees forward, the V1 points are deviated from the upper 7 degrees forward along the vertical plane, and the V2 points are respectively intersected with the black edge point cloud of the windshield glass along the straight line which is deviated from the lower 5 degrees forward along the vertical plane, so that windshield glass reference points a, b and c are obtained, the transparent area of the windshield glass is required to contain the windshield glass reference points a, b and c, and the seat reference points are moved according to the requirement so as to meet the standard. And obtaining a determined seat reference point (R point), and analyzing and checking the project engineering parameters of the competitive products vehicle driver through the R point.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.