Excavator load spectrum compilation method and system

Abstract

The invention discloses an excavator load spectrum compilation method and system. The excavator load spectrum compilation method comprises the steps that modeling is conducted on a whole excavator through virtual modeling software, and a dynamic model is obtained; modeling operation soil through discrete element modeling software and obtaining a discrete element model; performing operation joint simulation on the dynamical model and the discrete element model, and obtaining an initial load spectrum of a target part on the dynamical model through coupling calculation; the initial load spectrum is imported into finite element analysis software for strain analysis, and initial strain about the target part is obtained; a strain gauge is pasted to the position, corresponding to the target part, of the excavator entity, and the actual strain of the excavator about the target part after actual operation is obtained; adjusting modeling parameters of the dynamical model and / or the discrete element model according to the difference between the initial strain and the actual strain; and outputting the load spectrum of the target part on the dynamical model after the last adjustment. The method can improve the extraction precision and accuracy of the load spectrum, and reduces the extraction cost.

Description

technical field [0001] The invention relates to the technical field of engineering equipment, in particular to an excavator load spectrum preparation method. The invention also relates to an excavator load spectrum preparation system. Background technique [0002] Engineering equipment is widely used in mining, road construction, emergency rescue and other fields. [0003] An excavator is a common engineering equipment used for soil excavation operations. During the construction process, alternating loads are the main cause of fatigue fractures in excavator power devices (such as buckets, booms, etc.). In order to analyze whether the power under the current structure meets the design life, engineers need to extract the load spectrum and carry out Fatigue life analysis. [0004] At present, the load spectrum can usually be obtained by experimental tests or simulation calculations. Among them, the test method has certain non-repeatability, such as excavator operator's oper...

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Problems solved by technology

[0006] However, in the first extraction method, it is difficult to correspond the working experience with the actual situation one by one, and there are often large deviations when the power plant is in a complex working condition; the second extraction method only stays in the force analysis of the power plant In terms of dynamics, it ignores the influence of the result parameters of different soil properties on the working device in actual work; the third extraction method needs to improve the structure of the power device itself, so it requires high sensor design and manufacturing costs, and also The need to improve the power device itself increases the cost of the experiment, and the pin sensor is not universal, and the work efficiency is also low

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