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Dynamic load spectrum compilation method based on time domain extrapolation technology

A dynamic load and load technology, applied in instruments, character and pattern recognition, computer parts, etc., can solve problems such as inapplicability of non-stationary loads, strong subjective factors in threshold selection, and low reconstruction accuracy of extreme value loads. Conducive to automation, avoiding errors, and improving the efficiency of compilation

Pending Publication Date: 2021-07-09
CHINA AGRI UNIV
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Problems solved by technology

[0005] In view of the above-mentioned technical problems, the purpose of the present invention is to provide a dynamic load spectrum preparation method based on time-domain extrapolation technology to solve the problem that the prior art is not suitable for non-stationary loads, the subjective factors of threshold selection are strong and the reconstruction accuracy of extreme loads lower question

Method used

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  • Dynamic load spectrum compilation method based on time domain extrapolation technology
  • Dynamic load spectrum compilation method based on time domain extrapolation technology
  • Dynamic load spectrum compilation method based on time domain extrapolation technology

Examples

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Embodiment

[0111] refer to figure 1 , shows a method for compiling a dynamic load spectrum based on time-domain extrapolation technology according to the present invention, including steps 1 to 4.

[0112] The measured load in the embodiment is the load history of the tractor drive shaft in a complete plowing operation condition, the unit is N·m, the sample length is 40min, and the number of load sample points is 14096. In specific implementation, the measured load data under specific working conditions can be obtained directly by adding corresponding sensors to the key parts of the machine under test.

[0113] Step 1. Process the time domain signal of the measured load by using the load time domain decomposition method of Empirical Mode Decomposition (EMD) to obtain the principal component load and trend load;

[0114] Step 1.1, using the Empirical Mode Decomposition (EMD) method to decompose the time-domain signal of the measured load through formula 1, as figure 2 As shown, a total...

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Abstract

The invention relates to a dynamic load spectrum compilation method based on a time domain extrapolation technology, and the method comprises the following steps: 1, processing an actually measured load time domain signal through employing a load time domain decomposition method of empirical mode decomposition, and obtaining a principal component load and a trend load; step 2, calculating an upper and lower limit optimal threshold value based on a threshold value screening method, and obtaining a fitting distribution function consistent with extreme value sample distribution exceeding the threshold value; 3, extrapolating and reconstructing the extreme value sample exceeding the threshold value on the basis of the step 2 to obtain a complete extrapolation load; and 4, compiling a dynamic load spectrum based on an improved time domain extrapolation method. According to the method, more accurate load input can be provided for simulation analysis and reliability tests in the field of mechanical engineering, and the precision of load spectrum compilation is further improved.

Description

technical field [0001] The present invention relates to a method applied to the preparation process of load spectrum, more specifically, the present invention relates to a dynamic load spectrum preparation method based on time domain extrapolation technology. Background technique [0002] In the early stage of product development, it is extremely difficult to obtain the load information of the machine during the life cycle through the real vehicle test under all working conditions, which requires huge manpower, material resources and time costs. Therefore, R&D personnel are more inclined to obtain more complete load information by obtaining basic load data of the machine under various working conditions through short-term tests, that is, load extrapolation technology. As an important link in the process of load spectrum compilation, load extrapolation can provide continuous and accurate load information for load spectrum compilation based on limited tests, effectively reduce...

Claims

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Application Information

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IPC IPC(8): G06K9/00
CPCG06F2218/00
Inventor 宋正河杨子涵
Owner CHINA AGRI UNIV
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