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A method for compiling a test load spectrum

A technology of load spectrum and load, which is applied in the field of test load spectrum compilation, can solve the problems that the real loading conditions of key components cannot be reproduced, the load change process is not considered, and the cost of research and development is increased, so as to shorten the test period, reduce the test cost, The effect of high accuracy

Active Publication Date: 2018-12-11
METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI +2
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  • Application Information

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Problems solved by technology

[0006] In the existing technology, there are mainly two methods for compiling the test load spectrum of the key components of the railway vehicle. One is based on the measured load time history, using the rainflow counting method to obtain the load spectrum block, and compiling the test load spectrum through the principle of damage consistency. Load spectrum block, this method converts the time-domain signal into a frequency-domain signal, does not consider the change process of the load, and cannot reproduce the real loading situation of key components; another method is to load the measured load time history directly as the test load spectrum Test, the test period of this method is too long, which greatly increases the cost of research and development

Method used

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  • A method for compiling a test load spectrum
  • A method for compiling a test load spectrum
  • A method for compiling a test load spectrum

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Experimental program
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Embodiment 1

[0058] Such as figure 1 As shown, a method for compiling the load spectrum of the simulated line loading test for key components of railway vehicles includes the following steps:

[0059] Step 1. Selection of stress reference points

[0060]Using the simulation calculation method, combined with the actual use of key components, select the fatigue risk parts, and then select the points with relatively large stress in the simulation calculation and the points that often have problems in actual use as stress reference points. Table 1 shows the selection results of the stress reference point of a railway freight car body.

[0061] Table 1 Selection results of stress reference points for a certain railway freight car body

[0062] serial number

Location

1

The connection area between the lower cover plate of the outer pillow beam and the middle beam

2

The connection area between the lower cover plate of the pillow beam and the middle beam

3 ...

Embodiment 2

[0099] Except for special instructions, this embodiment adopts the same method as that of Embodiment 1. This embodiment compares the difference between the method of the present invention without introducing the stress average threshold value and only setting the stress amplitude threshold value.

[0100] The stress time history of the stress reference point 1 of a railway freight car body is obtained by the rainflow counting method to obtain two stress cycles 1 and 2, as shown in Figure 5 shown. The statistical results of stress cycle 1 and stress cycle 2 are shown in Table 5. The stress amplitudes of stress cycle 1 and stress cycle 2 are lower than the stress amplitude threshold σ aH , the average stress value is higher than the stress average value threshold σ mH According to the judgment of the existing technology, the two stress cycles belong to the invalid stress cycle, but this part of the stress cycle contributes to the damage of key components and belongs to the ef...

Embodiment 3

[0104] Except for special instructions, this embodiment adopts the same method as that of embodiment 1. In this embodiment, the difference in effect between straight line connection and semi-positive curve connection after deleting invalid and invalid load time periods is compared.

[0105] After deleting the invalid load period, the load time history has a breakpoint, such as Image 6 shown. The connection mode between two adjacent breakpoints is as follows: Figure 7 as shown, Figure 7 (a) is the traditional connection method. After the invalid time period is deleted, breakpoint 2 is translated to the same time point as breakpoint 1, and the two breakpoints are connected by a straight line. The test load spectrum prepared by this connection method introduces a large number of singular points, which is inconsistent with the actual situation. Moreover, during the loading test, the test bed operation cannot achieve a smooth transition, which can easily lead to the test bed l...

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Abstract

The invention relates to a method for compiling a test load spectrum, which comprises the steps of selecting a stress reference point, processing a measured data signal, setting a threshold value of an invalid stress cycle, judging an invalid stress cycle, determining an invalid load period and connecting a breakpoint. This method can shorten the test cycle, reflect the loading condition of key components, and satisfy the principle of damage consistency before and after concentration.

Description

field of invention [0001] The invention belongs to the field of test and test systems, and in particular relates to a preparation method of a test load spectrum. technical background [0002] The key components of railway vehicles are one of the important factors affecting the safe operation of trains, and testing is an important means of designing and evaluating key components. In terms of testing, the line test method can reflect the real working conditions of key components, but the test period is long and the cost is high, and it is impossible to conduct line test tests on every line and every model. The indoor simulated circuit bench test method can be tested with a shorter period and higher efficiency. Therefore, the simulated line bench test is very necessary for the design and evaluation of key components. [0003] When carrying out line simulation loading test on indoor test bench, it is necessary to compile the test load spectrum for loading as the driving excita...

Claims

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Application Information

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IPC IPC(8): G06F17/50G01M17/08
CPCG01M17/08G06F2119/06G06F30/20
Inventor 赵方伟张关震吴斯吴毅张澎湃丛韬尹鸿祥张弘张斌付秀琴
Owner METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI
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