Jitter-free real-time rain flow counting method for structural fatigue life analysis

Abstract

The invention provides a jitter-free real-time rain flow counting method for structural fatigue life analysis. According to the invention, the data points which may cause the cyclic counting jitter phenomenon in the future and the corresponding cyclic values are temporarily stored by virtue of the constructed database, and once the data jitter phenomenon occurs, the cyclic counting result can be corrected, so that the cyclic counting jitter phenomenon is avoided; when the method is used for processing structural load data, the first two data points A and B are read firstly, and then a countingmethod for the data points K with odd numbers and the data points L with even numbers behind the third data point is given according to A (B or A) B in two situations. According to the method, all load process data including divergent convergence waves can be processed in real time on the premise that the sequence of the load process data does not need to be adjusted and any data points are not missed; moreover, the cyclic counting result is not affected by future data, the jitter phenomenon of cyclic counting is avoided, the counting result is more accurate, and the calculation efficiency ishigh.

Description

technical field [0001] The invention relates to the technical fields of structural load history data processing, cycle counting and data storage, in particular to a vibration-free real-time rainflow counting method for structural fatigue life analysis. Background technique [0002] For a structure subjected to cyclic loading, under repeated loading and unloading, even if the internal stress level of the structure is far below the allowable stress of the material, when the number of load cycles is large enough, the structure will still undergo fatigue damage. Different from the strength failure of the structure, it is impossible to predict when the structure will fail when the structure is put into use, and the occurrence of fatigue damage often requires the structure to operate for a period of time (even for a long time). Moreover, before fatigue failure occurs in the structure, the performance of the material has obviously deteriorated, and even fatigue cracks have occurred...

AI Technical Summary

Problems solved by technology

[0012] Aiming at the problem that the existing technology cannot realize real-time performance and jitter occurs during cycle counting, the present invention provides a jitter-free real-time rainflow counting method for structural fatigue life analysis, which is an improved rainflow counting method, and the present invention The method can accurately and real-time process the cycle counting process of the load history data of the structure, and convert it into a series of cycle amplitudes and corresponding cycle times

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