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Method for calculating train appearance similarity

A calculation method and technology of similarity, applied in the field of calculation of similarity of train appearance, can solve problems such as large span and inability to correctly reflect the degree of correlation, and achieve the effect of overcoming limitations

Pending Publication Date: 2022-02-18
HUNAN UNIV
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Problems solved by technology

[0005] However, because high-speed trains are different from general products, performance issues such as aerodynamics must be considered in the design and iteration process, and the size of the deformation area increases with the increase in operating speed, and the span is large.
The results obtained by substituting product parameters of different magnitudes into the above calculation formula cannot correctly reflect the degree of correlation

Method used

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  • Method for calculating train appearance similarity
  • Method for calculating train appearance similarity
  • Method for calculating train appearance similarity

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Embodiment Construction

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0042] Such as Figure 1 to Figure 4 As shown, a calculation method for train shape similarity includes the following steps:

[0043] Step S1, modeling each comparative train in a unified spatial Cartesian coordinate system; wherein, the streamlined length of the train model L s The direction is consistent with the direction of the X-axis, the streamlined end position of the train model is located at the coordinate X=0, the tip of the nose faces the positive direction of the X-axis, and the X-axis coincides with the symmetry plane of the train model; the height direction of the train model is consistent with the Z-axis direction, and The rail surface is located at the coordinate Z=0, and the roof faces the positive direction of the Z axis;

[0044] Step S2, performing dimensionless processing on the surface point coordinate paramete...

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Abstract

The invention discloses a method for calculating train appearance similarity. The method comprises the following steps: modeling each comparison train in a unified space rectangular coordinate system; performing dimensionless processing on the surface point coordinate parameters of the comparison train models; collecting coordinate parameters of profile feature points of each comparison train model; and calculating a similarity coefficient R according to the coordinate parameters of the profile feature points. Compared with the prior art, the calculation method can overcome the limitation of a Pearson correlation coefficient calculation model so as to be suitable for calculation of the high-speed train.

Description

technical field [0001] The invention mainly relates to the technical field of research on train appearance features, in particular to a calculation method for train appearance similarity. Background technique [0002] In the study of product shape features, the existing shape similarity quantification methods mainly start from the product feature parameters, quantify the correlation degree of each shape feature of the product in the iterative process, and assist in the extraction of high correlation shape features to guide the iterative process The shape design of new products. Among them, the main calculation model is the Pearson correlation coefficient calculation model, which is used to measure the degree of linear correlation between two variables, and its calculation formula is: [0003] [0004] Among them, r is the correlation coefficient between the two variables of x and y, and a threshold [r] is set for it. When the r value [-1,1] in the calculation model excee...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/15G06K9/62
CPCG06F30/15G06F18/22
Inventor 姬鹏廖思璐冯子凌
Owner HUNAN UNIV
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