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Method for drawing line-of-sight envelope contour by calculating line-of-sight intersection based on rectangular coordinate system

A rectangular coordinate system and envelope technology, which is applied in the field of drawing the line of sight envelope contour based on the calculation of the line of sight intersection based on the rectangular coordinate system, can solve the problems of accumulation of errors, large human influence factors, and complicated and tedious calculation process, and improve the accuracy. and accuracy, the calculation process is simple and easy to understand, and the operability is strong.

Pending Publication Date: 2022-06-28
CAMCE WHU DESIGN & RES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In road design, the calculation method of the maximum lateral clear distance is to use the relevant calculation formula of the maximum horizontal clear distance to calculate the maximum value that should be cleared inside a certain curve. Since the clearing value of each section on the curve is different, if the entire curve is equal to If this value is used for clearing, it will inevitably cause waste of engineering
[0005] Drawing the line-of-sight envelope curve The conventional graphic drawing method is greatly influenced by human factors, and the drawing speed is relatively slow. The calculation process of the existing calculation method includes a large number of calculus derivation processes, and the calculation parameters still need to rely on the curve elements of the route (such as: tangent line Long T, route angle α, etc.), and too many variables are introduced in the calculation process, the calculation process is complicated and cumbersome, which will lead to error accumulation and affect the drawing precision and accuracy

Method used

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  • Method for drawing line-of-sight envelope contour by calculating line-of-sight intersection based on rectangular coordinate system
  • Method for drawing line-of-sight envelope contour by calculating line-of-sight intersection based on rectangular coordinate system
  • Method for drawing line-of-sight envelope contour by calculating line-of-sight intersection based on rectangular coordinate system

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Experimental program
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Effect test

Embodiment 1

[0099] like figure 1 , Figure 7 As shown in the figure, a method for drawing a line-of-sight envelope contour based on a Cartesian coordinate system for calculating a line-of-sight intersection includes the following steps:

[0100] S100, carry out road plane design in the computer, and determine the driving trajectory according to the lane division;

[0101] S200, establishing a Cartesian coordinate system, and placing the driving trajectory in the Cartesian coordinate system;

[0102] S300. Select the coordinates of the starting point of the sight line on the driving track, and calculate the coordinates of the end point of the sight line;

[0103] S400, derive the line of sight function expression;

[0104] S500. Simultaneously combine adjacent line-of-sight functions to solve the coordinates of the line-of-sight intersection;

[0105] S600, repeating S300-S500 to obtain the coordinates of a plurality of sight line intersections;

[0106] S700 , connecting the coordina...

Embodiment 2

[0108] This embodiment is a further improvement carried out on the basis of Embodiment 1, and the details are as follows:

[0109] The driving track is composed of a combination of straight lines and circular curves;

[0110] Alternatively, the driving trajectory consists of a combination of straight lines, gentle curves and circular curves;

[0111] It is decided according to different actual situations.

Embodiment 3

[0113] This embodiment is a further improvement carried out on the basis of Embodiment 2, as follows:

[0114] If the driving trajectory is composed of a straight line and a circular curve, the straight line segment is used as the X-axis, the straight circle point is the origin, the radius of the circular curve is R, and the coordinates of the center of the circular curve (m, n) are used to draw the driving trajectory in the Cartesian coordinate system. ;

[0115] If the driving trajectory is composed of a straight line, an escalating curve and a circular curve, take the straight line segment as the X-axis, take the straight escalating point or the escalating straight point as the origin, the escalating curve element A, the radius of the circular curve R, the full length of the escalating curve Ls, the circle The coordinates of the center of the curve (m, n), and the driving track is drawn in the Cartesian coordinate system.

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Abstract

The invention relates to a method for calculating a sight line intersection point and drawing a sight distance envelope contour based on a rectangular coordinate system, and the method comprises the following steps: S100, carrying out the road plane design in a computer, and determining a driving track according to the lane division; s200, establishing a rectangular coordinate system, and placing the driving track into the rectangular coordinate system; s300, selecting a sight line starting point coordinate on the driving track, and calculating a sight line end point coordinate; s400, deriving a sight line function expression; s500, the adjacent sight line functions are combined, and sight line intersection point coordinates are solved; s600, repeating the steps S300 to S500 to obtain a plurality of sight line intersection point coordinates; and S700, connecting a plurality of sight line intersection point coordinates in series to obtain a sight line envelope contour. The method has the advantages that pure mathematical equation solving is carried out in the computer by means of a rectangular coordinate system, the number of parameters in the solving process is small, the calculation process is simple and easy to understand, operability is high, and the drawing precision can be controlled according to the number of the selected sight starting points.

Description

technical field [0001] The invention relates to the field of road design, in particular to a method for drawing a line-of-sight envelope contour by calculating a line-of-sight intersection point based on a rectangular coordinate system. Background technique [0002] Sight distance is an important design index to ensure road driving safety. Only when the required sight distance is met, the driver can respond in time to ensure driving safety. [0003] The conventional methods of driving sight distance inspection mainly include the calculation method of the maximum lateral clear distance and the geometric drawing method (often called "drawing the sight distance envelope curve"). These methods are simple and practical. The former can test whether the sight distance at the position on the curve is not. Satisfying the requirements, the latter can determine the range on the curve that affects the viewing distance. [0004] In road design, the calculation method of the maximum late...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/70G06T11/20G06F17/11
CPCG06T7/70G06T11/203G06F17/11G06T2207/30241G06T2207/30256
Inventor 黄坤
Owner CAMCE WHU DESIGN & RES CO LTD