Random multi-parameter load spectrum compilation method based on linear combination

Abstract

The invention discloses a random multi-parameter load spectrum compilation method based on linear combination, and the method comprises the steps: taking a multi-parameter actual measurement load spectrum of a component as basic spectrum compilation data, and carrying out the data compression, namely equivalent judgment, peak-valley value detection and non-key point elimination processing, for a multi-parameter random load, so as to obtain a multi-parameter simplified load process; the method comprises the following steps: obtaining a multi-parameter composite load history through linear combination of a multi-parameter simplified load history, carrying out peak-valley value extraction processing on the multi-parameter composite load history to obtain a composite load peak-valley value sequence and a non-peak-valley value point set, and carrying out rain flow cycle counting to obtain a rain flow cycle matrix of the composite load history; carrying out load history reconstruction on the rain flow cyclic matrix, randomly inserting non-peak-valley points to obtain a composite load reconstruction history, and carrying out composite load linear calculation on the composite load reconstruction history to obtain a new multi-parameter random load spectrum; the method effectively solves the problems that in the prior art, component multi-parameter load spectrum compilation lacks multi-parameter load phase relation consideration, and multi-axis damage information is lost.

Description

technical field [0001] The invention relates to the technical field of multi-parameter random load spectrum preparation of complex mechanical components, and mainly relates to a random multi-parameter load spectrum preparation method based on linear combination. Background technique [0002] At present, most of the studies on load spectrum at home and abroad focus on the compilation of single-parameter load spectrum, and it has been widely used in aerospace, vehicles, construction machinery and other industrial fields. However, in practical engineering applications, most mechanical components are subject to random multi-parameter loads for a long time, that is, components are subjected to more than one load, and components are often prone to multiaxial fatigue damage and failure. For example, complex components such as aero-engine casing components, automobile universal joints and front suspensions are subjected to typical random non-proportional multiaxial loads in actual s...

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Problems solved by technology

[0006] Purpose of the invention: In view of the problems existing in the above-mentioned background technology, the present invention provides a random multi-parameter load spectrum preparation method based on linear combination, which is used to solve the lack of consideration of multi-parameter load phase relationship in the multi-parameter load spectrum preparation of components in the prior art , The problem of loss of multi-axis damage information

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