Fault propagation risk analysis method and prevention and control method based on a meta-motion chain

Abstract

The invention discloses a fault propagation risk analysis method and prevention and control method based on a meta-motion chain, and the method comprises the following steps: decomposing the functionsof a whole machine into a plurality of motions through employing an FMA function decomposition method, and further decomposing each motion into a meta-motion; determining the subordination relation of the meta-actions in each motion, and establishing a meta-action chain formed by connecting the meta-actions in the motion in series according to the motion transmission relation from the power source of the motion to the action executing mechanism; and then establishing a risk propagation model under a common influence condition according to the spontaneous probability of the internal influenceof the meta-actions and the coupling strength of the quantitative external action, and comprehensively analyzing the risk criticality of each meta-action from the perspective of global risk influence.According to the method, on the basis of the reliability analysis idea of the meta-action chain, after the weak link is determined, the fault diagnosis work of the meta-action unit forming the meta-action is clearer, the vain fault search in the fault diagnosis is reduced, and the fault diagnosis efficiency is improved.

Description

technical field [0001] The invention relates to reliability analysis and preventive maintenance methods of mechanical products, in particular, to a method of risk analysis and prevention and control of fault propagation based on meta-action chains. Background technique [0002] In recent decades, with the continuous improvement of people's needs, the performance and function of products have been continuously improved, which means that the functions of mechanical products will become more powerful than before, and the structure will become more complex. There is an uncertain coupling relationship between each subsystem and between subsystems, or between units, thus forming a complex coupling fault propagation process, which brings certain difficulties to product design engineers. [0003] In the field of product failure analysis, commonly used reliability analysis methods include FMEA, FTA, Markov and other methods. These methods are mainly based on single indicators such as...

AI Technical Summary

Problems solved by technology

Compared with traditional machine tools, today's CNC machine tools have a highly complex structure. If the reliability analysis of the whole machine is performed directly, the workload will inevitably increase, and the analysis results will be more or less missing

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