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Geometric algorithm for high-speed circuit transition curve

A geometric algorithm, high-speed loop technology, applied in vehicle testing, machine/structural component testing, measuring devices, etc., can solve problems such as application limitations, and achieve the effect of full automation and control of calculation accuracy

Inactive Publication Date: 2013-04-17
SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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Problems solved by technology

Therefore, the shortcomings of the existing McConnell curve design method are more obvious, and its application is limited

Method used

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  • Geometric algorithm for high-speed circuit transition curve
  • Geometric algorithm for high-speed circuit transition curve
  • Geometric algorithm for high-speed circuit transition curve

Examples

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Embodiment Construction

[0023] McConnell's transition curve design method takes the sensitivity of the human body to motion as the geometric design criterion of the road, and proceeds from the allowable maximum roll acceleration change rate when the vehicle is running at high speed on the transition curve, deduces that due to the transition Series formulas for curve design.

[0024] The McConnell curve uses the characteristic value of the side swing motion as the control index of the geometric design of the high-speed loop, and uses the change rate J of the side swing motion acceleration (the change rate of the side swing angle acceleration section) as the control of the high-speed loop relaxation curve sexual design parameters.

[0025] Summary table of calculation formulas for side swing characteristic values ​​Table 1

[0026]

[0027] Coordinate Calculation Table of McConnell Spiral Curve Table 2

[0028]

[0029]

[0030] In the table: (8)α 1 = β 1 +β 2 +…+β i-1 +β i / 2

[...

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Abstract

The invention discloses a geometric algorithm for a high-speed circuit transition curve, which adopts a McConnell transition curve calculation formula and is characterized in that a Simpson integration algorithm is introduced into the McConnell transition curve calculation formula; an angle of declination of a random point on the transition curve is calculated; and each coordinate of the transition curve is calculated by the angle of declination. According to the invention, the Simpson integration algorithm is introduced into the McConnell transition curve calculation formula and curve integral adopts a Simpson iteration method; a calculation error is not influenced by the length of a calculation route or an account step; the defects that in a conventional offset method, an accumulated error is increased along with increase of the calculated length and the error is increased along with increase of the iteration step size are overcome; and the geometric algorithm is beneficial for controlling calculation accuracy. The McConnell curve integration algorithm adopted by the geometric algorithm overcomes the defects of a conventional McConnell curve offset iteration method and creates beneficial conditions for accuracy control of automatic paving of a newly constructed high-speed circuit curved surface machinery.

Description

Technical field: [0001] The invention relates to the technical field of geometric design of high-speed loops in automobile proving grounds, in particular to a geometric algorithm mainly used for relaxation curves of high-speed loops. Background technique: [0002] As the main facility of the automobile proving ground, the high-speed ring road generally requires a special geometric design method to provide effective, safe and relatively comfortable operating conditions for continuous high-speed driving tests on a relatively limited site. Its technical index requirements such as the radius of the plane surface and the super-elevation in the transverse direction have far exceeded the limitations of the technical standards for geometric design of expressways. On the other hand, the curved part of the high-speed ring road is completely different from the general road, and the geometric characteristics of the three-dimensional surface of the space have a great influence on the saf...

Claims

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Application Information

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IPC IPC(8): G01M17/007
Inventor 李进刘伟民林巧飞蒋永康王士林林梦蝶陆涛
Owner SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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