A Load Spectrum Design Method for Multi-Dimensional Comprehensive Stress-Life Test Based on Load Information Matrix

Abstract

The invention discloses a multi-dimensional comprehensive stress life test load spectrum design method based on a load information matrix, which is applied to the field of electromechanical equipment life test under complex working conditions. The method uses the load information matrix statistical method to perform statistical analysis on various types of stress characteristics under complex working conditions, and uses the acceleration model to normalize the stress levels. The load information matrix can take into account the application duration of different types of stress and the switching frequency before the stress level. It can effectively count and analyze the comprehensive stress test load spectrum of electromechanical equipment subjected to multiple stresses at the same time, and according to the equivalent cumulative damage consistency theory, the stress level of the load information matrix can be accelerated according to the acceleration factor, thereby shortening the test application and completing the accelerated life. Design of the test load spectrum. This method provides an effective load spectrum statistics and design method for electromechanical equipment subjected to multi-dimensional stress, which is convenient for the development of life tests and accelerated life tests.

Description

technical field [0001] The invention belongs to the field of reliability life tests of electromechanical products, and in particular relates to a load spectrum design method for multidimensional comprehensive stress tests based on a load information matrix. Background technique [0002] The reliability life test plays an important role in the measurement and verification of the reliability of electromechanical products and the further improvement guidance of the equipment life. Through the reliability life test, the life characteristics and failure rules of the tested products can be deeply understood. Usually the life characteristics of some simple electromechanical equipment are obtained by the method of life test under normal conditions. However, taking aircraft hydraulic pumps as an example, for this type of electromechanical products with high reliability and long life, due to their precise design, complex manufacturing process, high production cost and strong specifici...

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Problems solved by technology

Because the failure mechanism of electromechanical products is more complicated than that of electronic products, they will be subjected to various types of stress such as constant stress and alternating stress during operation. The complexity of working conditions and periodic stress determine the variety of failure modes. The stress coupling is serious and it bears the characteristics of variable stress, and its life characteristics cannot completely depend on the action of a single stress

Therefore, the traditional single-stress accelerated test load spectrum is difficult to meet the accelerated test requirements of mechanical products under multiple stresses, and the test results deviate from the life indicators under actual working conditions, which brings huge challenges to reliability and life evaluation.

Considering that the current load spectrum and acceleration method in the test environment of electromechanical products are difficult to accurately reflect the actual complex working conditions, and it is difficult to give accurate life evaluation results, how to design the load spectrum of the life test and the accelerated life test according to the characteristics of the actual multi-dimensional stress becomes The key to breaking through the theory and statistical method of multi-dimensional comprehensive stress accelerated life test of electromechanical products

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