Automobile part load spectrum rapid compression method based on Hilbert-Huang transform
A technology of auto parts and compression methods, applied in the testing of machine/structural components, genetic laws, genetic models, etc., can solve the problems of limited reduction effect and differences, and achieve good compression effect, consistent distribution, and guaranteed consistency Effect
Pending Publication Date: 2022-02-11
RES INST OF HIGHWAY MINIST OF TRANSPORT +1
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However, the reduction effect of this method is limited, and the obtained compressed signal has significant changes compared with the original signal in terms of statistical parameters, power spectral density analysis, marginal spectrum analysis, and level counting.
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[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0034] figure 1 is a flow chart of the fast compression method for load spectrum of auto parts based on Hilbert-Huang transform, and its specific process is as follows:
[0035] 1) Obtain and input the original load signal;
[0036] 2) Preprocessing the load spectrum, including filtering, deburring, drift correction processing and resampling;
[0037] 3) Perform empirical mode decomposition on the original load signal to obtain multiple intrinsic mode functions;
[0038] 4) Hilbert-Huang transform is performed on each intrinsic mode function to obtain the instantaneous energy spectrum of the load signal;
[0039] 5) Use the genetic algorithm to set a threshold for the instantaneous energy spectrum, and locate the segment of the instantaneous energy spectrum that is lower than the threshold according to the obtained threshold, and l...
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The invention relates to an automobile part load spectrum rapid compression method based on Hilbert-Huang transform. The method comprises the following steps of 1) acquiring and inputting an original load signal; 2) preprocessing the load spectrum; 3) performing empirical mode decomposition on the original load signal to obtain a plurality of intrinsic mode functions; 4) performing Hilbert-Huang transform on each intrinsic mode function to obtain an instantaneous energy spectrum of the load signal; 5) setting a threshold value for the instantaneous energy spectrum by using a genetic algorithm, positioning an instantaneous energy spectrum fragment lower than the optimal threshold value, and deleting a corresponding time fragment in the load signal; 6) splicing the reserved signal segments to obtain an optimal compression signal; 7) calculating the fatigue damage retention amount and the like of the compression load signal and the original load signal, checking the power spectrum density and the level crossing count, when the error of the fatigue damage retention amount and the like is greater than 15%, circulating the step 5) to resolve the threshold value, and otherwise, jumping out the circulation; and 8) completing the compression work of the load spectrum of the automobile parts.
Description
technical field [0001] The invention relates to the field of indoor road simulation tests of auto parts, in particular to a fast and effective compression method for the load spectrum of auto parts based on Hilbert-Huang transformation. Background technique [0002] The reliability of auto parts is one of the important factors affecting the safety of automobile operation, and the test is an important evaluation method for the design and manufacture of auto parts. The indoor road simulation test does not need to involve the lease of the test site, the employment of the driver, etc., and can improve the test efficiency and shorten the test time by editing the test load spectrum, so it is widely used. The load spectrum editing technology of auto parts is one of the important links in the research of indoor road simulation tests. Accelerated editing of the collected part load spectrum can obtain a load spectrum with a shorter time under the premise of ensuring the same loading e...
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Login to View More IPC IPC(8): G01M17/007G06N3/12G06F17/14G06F17/18
CPCG01M17/007G06N3/126G06F17/14G06F17/18Y02T90/00
Inventor 晋杰周炜杨永乐张志飞张禄张佳云侯琛徐中明曹晋阳李臣
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT