Smooth-based ballastless track elevation linear correction method

Abstract

The invention relates to the technical field of high-speed railway tracks, and discloses a smoothness-based ballastless track elevation linear correction method, and a ballastless track comprises a ballastless track grade change point section and / or a section near an ultrahigh downhill point. Comprising the following steps: S1, calculating elevation parameters of a ballastless track grade change point section and a section near an ultrahigh downhill point according to existing data; s2, determining a required smoothness wavelength parameter according to the line grade; s3, calculating irregularity of a ballastless track variable slope point section and a section near an ultrahigh down slope point in a smoothness wavelength parameter range of the ballastless track variable slope point section and the ultrahigh down slope point section; s4, calculating a corrected elevation parameter; s5, calculating corrected height parameters; s6, in absolute elevation control adjustment, taking the corrected elevation parameter as a target value for adjustment; and S7, in relative height control adjustment, performing adjustment by taking the corrected height parameter as a target value. According to the invention, the track is accurately measured and adjusted according to the corrected elevation data or height data, so that the height parameters of the line track meet the requirement of high smoothness.

Description

Technical Field

[0001] The invention relates to the technical field of high-speed railway tracks, and in particular to a method for correcting the elevation line shape of a ballastless track based on smoothness. Background Art

[0002] High-speed railways are the development trend of rail transportation in the world today. With the large-scale construction and operation of high-speed railways in my country, higher requirements are put forward for the comfort of high-speed trains, which requires a high and smooth railway line. The accurate geometric dimensions of railway tracks are the most basic conditions for ensuring the safe operation of trains. Only high and smooth tracks can ensure the safety of high-speed operation and high comfort.

[0003] In the construction standards of high-speed railway lines, the plane of the line is composed of straight lines, transition curves and circular curves, and the superelevation of the curve is generally completed in the transition curve. The longitudinal section of the line is connected by a slope straight line and a circular curve. Due to the use of transition curves in the plane curve of the line, the track direction has a high degree of smoothness. In the longitudinal section of the line, the slope change point adopts a straight-circle-straight line shape. Even if the curve radius is large, there are sudden changes in curvature at the straight-circle and circle-straight points, which will inevitably lead to the dynamic response of the high-speed train during the operation of the train. On the other hand, at the front and rear slope points of the transition curve, due to the superelevation slope, the outer rail of the curve also has a sudden change in slope, which will also lead to the dynamic response of the high-speed train.

[0004] In recent years, my country's high-speed railways have been accelerated to a daily operating speed of 350km / h. Sudden changes in curvature and slope have caused the dynamic response of operating vehicles to affect the riding comfort during high-speed rail operations. Summary of the invention

[0005] In order to overcome or alleviate one or more of the above technical problems, the purpose of the present invention is to provide a method for correcting the elevation linearity of ballastless track based on smoothness. Under the premise of applying the high-speed railway design specifications, based on the principle of smoothness, a method for correcting the elevation parameters on the railway longitudinal section is proposed to ensure the high smoothness of the high-speed railway track. This method aims at the sudden change of curvature of the vertical curve on the longitudinal section of the line and the sudden change of slope at the super-elevation slope point, and fundamentally solves the problem of track unevenness in line design.

[0006] The present invention provides the following technical solutions:

[0007] The present invention provides a method for correcting the elevation linearity of a ballastless track based on smoothness, wherein the ballastless track includes a ballastless track slope change point section and / or a section near a superelevation slope point, and comprises the following steps:

[0008] S1: The centerline elevation parameters of the ballastless track slope change point section are calculated based on the longitudinal section design data of the high-speed railway; the elevation parameters of the line transition curve and its front and rear outer rails are calculated based on the longitudinal section data, plane curve and superelevation parameters of the line in the section near the superelevation slope point;

[0009] S2: The required smoothness wavelength parameters are determined by the line level;

[0010] S3: The ballastless track slope change point section is calculated by the elevation parameter of the center line, and the section near the superelevation slope point is calculated by the elevation parameter of the outer rail of the curve, and the linear filtering technology is used to calculate the irregularity within the smoothness wavelength parameter range;

[0011] S4: subtract the unevenness obtained in step S3 from the elevation parameter calculated in step S1 to obtain a corrected elevation parameter;

[0012] S5: Calculate the corrected height parameters based on the corrected elevation parameters obtained in step S4;

[0013] S6: In the absolute elevation control adjustment, the modified elevation parameter is used as the fine adjustment target value for adjustment;

[0014] S7: In the relative height control adjustment, the corrected height parameters are used as fine-tuning target values ​​for adjustment.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The method for correcting the elevation alignment of a ballastless track based on smoothness provided by the present invention calculates the elevation parameters of the slope change point section and its front and rear sections based on the plane alignment and longitudinal section alignment of the line design. According to the operating speed level of the line, the wavelength parameter of the longest smoothness required for the line is determined, and the irregularity within the slope change point section within the smoothness wavelength range is calculated. The elevation of the line is corrected with the parameter so that the track elevation of the slope change point section line reaches the high smoothness of the required wavelength. For the sudden change in slope at the super-elevated slope point, the elevation parameters and the irregularity of the outer rails of the transition curve and its front and rear sections are calculated, and a similar correction method is also used to achieve the high smoothness of the required wavelength. The track is precisely measured and adjusted with the corrected elevation data or height and low data so that the height and low parameters of the line track meet the high smoothness requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A waveform diagram of vertical curve elevation parameters of a slope change point section of a ballastless track provided in an embodiment of the present invention.

[0018] Figure 2 A waveform diagram of elevation parameters at a superelevation slope point provided in an embodiment of the present invention.

[0019] Figure 3 The present invention provides a flow chart of a method for correcting the elevation line shape of a ballastless track based on smoothness. DETAILED DESCRIPTION

[0020] The present invention is described in detail below in conjunction with the embodiments and drawings, but it should be understood that the embodiments and drawings are only used to exemplify the present invention and do not constitute any limitation on the protection scope of the present invention. All reasonable changes and combinations within the scope of the inventive concept of the present invention fall within the protection scope of the present invention.

[0021] The flowchart of the ballastless track elevation alignment correction method based on smoothness provided by the present invention is as follows: Figure 3 According to the process, the present invention is further described below in conjunction with the accompanying drawings.

[0022] Example 1

[0023] This embodiment provides a method for correcting the vertical curve elevation parameters of a ballastless track slope change point section of a high-speed railway track in a certain place. The specific method is:

[0024] Assume that the design parameters of the elevation of this section of line are: the slope of the front straight line is -1‰, the starting elevation is 0 meters, the length is 200 meters, the radius of the circle is: 25,000 meters, the slope of the rear straight line is 1‰, and the length is also 200 meters.

[0025] Figure 1 Figure (a) shows the calculated elevation parameters. The function expression is set as:

[0026] Height = g(l) (1)

[0027] Among them, l is the mileage parameter, unit: meter.

[0028] According to the inspection requirements of "250 (not included) ~ 350km / h line track dynamic quality allowable deviation management value", the wavelength range of high and low inspection is 1.5 meters to 120 meters, thus determining the longest smoothness wavelength parameter to be 120 meters. The linear filtering algorithm is used to calculate the unevenness parameters within the 120-meter wavelength range of this section (900-meter line length), such as Figure 1 As shown in Figure (b). The filtering algorithm can be used, but is not limited to the following three algorithms:

[0029] (1) Perfect filtering algorithm: Among many algorithms, the zero-phase shift filtering algorithm based on Fourier transform can be used for offline processing;

[0030] (2) Bidirectional filtering algorithm: Second-order, fourth-order or higher-order Butterworth filters are often used in engineering applications. In order to eliminate phase distortion, the filter is applied forward and then reversely.

[0031] (3) Wavelet transform algorithm: Wavelet transform provides a flexible processing method. Linear filtering must be performed in the present invention, and compactly supported spline wavelet is one of the fast processing methods.

[0032] In this example, the wavelet transform method is used for filtering, and the result shows an unevenness with a peak value of about 0.0019 meters. The function expression is:

[0033] Roughness = r(l)(2)

[0034] The design elevation g(l) is deducted from the unevenness r(l) within 120 meters, and the corrected elevation is obtained:

[0035] Corrected elevation = g(l)-r(l)(3)

[0036] The roughness of the corrected elevation within the 120-meter wavelength range is 0, such as Figure 1 As shown in Figure (c).

[0037] Calculate the height parameters from the corrected elevation. For example, the height parameters for 10 meters are:

[0038]

[0039] In the fine measurement and fine adjustment, if absolute height control is adopted, the corrected height parameter is used as the fine adjustment target value for adjustment; if relative height control smoothness is adopted, the corrected height parameter is used as the fine adjustment target value for adjustment. After fine adjustment, the unevenness within the 120-meter wavelength range is eliminated.

[0040] Example 2

[0041] This embodiment provides a method for correcting elevation parameters at a superelevation slope point of a high-speed railway track in a certain place. The specific method is:

[0042] Assume that the length of the transition curve of the line is 500 meters, the radius of the circle is 8000 meters, and the superelevation design value is 0.135 meters. The starting point is a straight line, the length is 200 meters, and the starting point elevation is set to 0 meters.

[0043] The outer rail elevation parameters of the curve are as follows: Figure 2 As shown in Figure (a). The function expression is set as:

[0044] Elevation 外轨 =g w (l)(5)

[0045] The linear filtering algorithm is used to calculate the irregularity within the 120-meter wavelength range of the section (900-meter line length), as follows: Figure 2As shown in Figure (b), the result shows that the peak value of the irregularity is about 0.0019 meters. Its function expression is:

[0046] Unsmooth 外轨 =r w (l)(6)

[0047] The design height g w (l) Subtract the irregularity r within 120 meters w (l), the corrected outer rail elevation is obtained:

[0048] Outer rail corrected elevation = g w (l)-r w (l)(7)

[0049] The corrected outer rail elevation has a roughness of 0 within a wavelength range of 120 meters. Figure 2 As shown in Figure (c).

[0050] Calculate the height parameters of the outer rail from the corrected elevation. For example, the height parameters of 10 meters are:

[0051]

[0052] In the fine measurement and fine adjustment, if absolute height control is adopted, the corrected height parameter is used as the fine adjustment target value for adjustment; if relative height control smoothness is adopted, the corrected height parameter is used as the fine adjustment target value for adjustment. After fine adjustment, the unevenness within the 120-meter wavelength range is eliminated.

[0053] The above embodiments are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A ballastless track elevation alignment correction method based on smoothness, characterized by: The ballastless track includes a ballastless track slope change point section and / or a section near a superelevation slope point, and includes the following steps: S1: The centerline elevation parameters of the ballastless track slope change point section are calculated based on the longitudinal section design data of the high-speed railway; the elevation parameters of the line transition curve and its front and rear outer rails are calculated based on the longitudinal section data, plane curve and superelevation parameters of the line in the section near the superelevation slope point; S2: The required smoothness wavelength parameters are determined by the line level; S3: The ballastless track slope change point section is calculated by the elevation parameter of the center line, and the section near the superelevation slope point is calculated by the elevation parameter of the outer rail of the curve, and the linear filtering technology is used to calculate the irregularity within the smoothness wavelength parameter range; S4: subtract the unevenness obtained in step S3 from the elevation parameter calculated in step S1 to obtain a corrected elevation parameter; S5: Calculate the corrected height parameters based on the corrected elevation parameters obtained in step S4; S6: In the absolute elevation control adjustment, the modified elevation parameter is used as the fine adjustment target value for adjustment; S7: In the relative height control adjustment, the corrected height parameters are used as fine-tuning target values ​​for adjustment.

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