Method and device for determining multiaxial fatigue load spectrum

Abstract

The invention discloses a multi-axis fatigue load spectrum determination method and device, and the method comprises the steps: obtaining the random load data of a plurality of axes of a target object, such as an automobile part, automatically determining the damage value of the random load data of the plurality of axes, considering the multi-axis random load data of the target object, and determining the damage value of the multi-axis random load data of the target object. The fatigue load spectrum of the target object can be automatically determined according to the reference damage value and the damage value of the random load data of the multiple axes of the target object, high-requirement rack equipment is not needed, and the accurate and reliable fatigue load spectrum of the target object can be obtained under the condition of low cost. Therefore, the reliability and applicability of fatigue load spectrum verification of the target object are improved, and the durability and the service life of the automobile are ensured. When the target object is the part, the fatigue load spectrum of the part is determined by considering the multi-axis random load data of the part, and the number of times of determining and verifying the fatigue load spectrum of the automobile system level and the whole automobile level can be reduced.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a method and a device for determining a multiaxial fatigue load spectrum. Background technique [0002] The durability of an automobile refers to the working period of the entire vehicle and assembly of the automobile before reaching the limit wear value or unbearable use. The durability of automobiles depends on the properties of automobile parts, such as fatigue resistance. Therefore, accurately obtaining the fatigue resistance of automobile parts, that is, the fatigue load spectrum, has become one of the important concerns of the industry. [0003] In practical applications, the method for determining the fatigue load spectrum of a part is generally as follows: 1. Measure the actual random load of the part on the bench, and filter the measured actual random load to filter out large damage values ​​(for example: damage value). greater than or equal to 90%), so as to obtai...

AI Technical Summary

Problems solved by technology

However, it has been found in practice that in the first method, the determination of the accelerated fatigue load spectrum needs to be performed on multiple axes, so the requirements for the required bench equipment are relatively high, that is, the cost is high; in the second method, each The load of the shaft is accelerated in stages, ignoring the coupling of the load between each shaft of the part, and it is impossible to obtain an accurate and reliable fatigue load spectrum

Images