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Unequal-amplitude threshold data compression method and device

A data compression, non-uniform amplitude technology, applied in railway vehicle testing and other directions, can solve problems such as affecting compression efficiency and increasing test period, and achieve the effect of long test period, improved compression rate, and shortened fatigue test period.

Active Publication Date: 2019-07-23
CRRC QIQIHAR ROLLING CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] When the equal-amplitude threshold deletion method in the prior art deletes complex multi-channel data, there are still a large number of load events with no or little impact, which affects the compression efficiency and increases the test cycle

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  • Unequal-amplitude threshold data compression method and device

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Embodiment Construction

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0028] In the prior art, the equal-amplitude threshold deletion method is commonly used for data compression. figure 1 It is a schematic diagram of data compression of multiple measuring points in the prior art, such as figure 1 As shown, 1, 2, and 3 are three measuring points, and each measuring point is equivalent to a channel. The three w...

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Abstract

The present invention provides a method and a device for compressing non-constant amplitude domain data. The method determines whether a small load event is in an ascending load event or a descending load event in the rain flow counting statistics. If the small load event is a small load event in the ascending load event and the small load event is smaller than a minimum stress range, a half cycle of the period in which the small load event is counted in the rain flow counting statistics is removed. If the small load event is a light load event in the descending load event and the product of the small load event and the empirical parameter is less than the minimum stress range, a half cycle of the period in which the small load event is counted in the rain flow counting statistics is removed. The non-constant amplitude data compression of different load events is realized. Under the premise of fatigue damage equivalence, the compression efficiency is improved and the test period is shortened.

Description

technical field [0001] Embodiments of the present invention relate to the field of accelerated fatigue tests, and in particular to a method and device for compressing non-equal-amplitude threshold data. Background technique [0002] The bench-based carbody fatigue test is one of the important means developed in recent years to evaluate the fatigue life of full-scale railway wagon carbody. The fatigue test cycle of the railway freight car body is long. While ensuring the test accuracy, it is usually necessary to adopt the method of accelerating the fatigue test of the car body to shorten the test cycle and improve the test efficiency. The key technology of the accelerated fatigue test is to preprocess and compress the measured time-domain signal, and finally form the target signal for the accelerated fatigue test of the vehicle body. [0003] In the prior art, accelerated test compression methods include: small volume reduction method, increasing loading frequency method and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M17/08
CPCG01M17/08
Inventor 李向伟吕世元张强李文全赵尚超
Owner CRRC QIQIHAR ROLLING CO LTD
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