A Fault Tree Analysis Method for Hydraulic System of CNC Grinding Machine Based on Breakpoint Model

Abstract

The invention discloses a fault tree analysis method for a numerical control grinding machine hydraulic system based on a breakpoint model. The fault tree analysis method is characterized by removing sub fault trees which subordinates intermediate events with the occurrence probability less than a preset value, the correlation degree less than a preset value with upper level events and the improvement costs greater than a default value by comprehensively considering the three factors of the occurrence probability of the events, the correlation degree between the events and the upper level events and the improvement costs of the events, and then conducting a fault tree analysis. The fault tree analysis method for the numerical control grinding machine hydraulic system based on the breakpoint model has the advantages of shortening the improvement process, reducing the improvement costs and improving the economic benefit of products.

Description

technical field [0001] The invention belongs to the field of reliability analysis of a numerical control grinding machine, and more specifically relates to a fault tree analysis method for a hydraulic system of a numerical control grinding machine based on a breakpoint model. Background technique [0002] The traditional fault tree analysis method is based on Boolean algebra and probability theory. The fault tree is composed of events and gates. The occurrence of events is described by fault concepts, and the connection of events is described by gates. This analysis method has been widely studied and applied in the reliability analysis of hydraulic systems. [0003] At present, there are three main problems in the fault tree analysis technology: 1. The fault data of mechanical parts cannot be obtained more accurately, which leads to the failure of the theory based on the calculation method of importance; 2. The chain of faults of mechanical products is relatively long, which...

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Problems solved by technology

The other is that the probability of the occurrence of the intermediate event is relatively small, and the cost of controlling the bottom event connected to the event (design, improvement, assembly, etc.) is very high under the existing conditions, so controlling the event will It consumes a lot of cost, and its impact on the top event is not great, and the economic benefits obtained after controlling it are still low

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