A risk assessment method for equipment operating under variable conditions

Abstract

The invention discloses an equipment variable working condition operation risk evaluation method. The method comprises the steps of 1 extraction of equipment operation parameters and operation parameter feature fusion based on information entropy, 2 equipment normal operation state monitoring model building, 3 equipment fault operation state monitoring model building, 4 building of an equipment variable working condition monitoring model based on CHMM-SVM and 5 equipment operation risk evaluation output based on a D-S theory. According to the method, by conducting feature fusion on vibration signals and process signals of monitoring equipment on the basis of the information entropy, the operation state of the equipment can be reflected comprehensively, an equipment variable working condition monitoring model based on the CHMM-SVM is built, the influence of the process signal changes and faults of the equipment on the equipment operate state can be separated, operation risk evaluation is conducted on a single-state monitoring model and an equipment overall state monitoring model on the basis of the D-S theory, the practicability is high, the use effect is good, and application and popularization are convenient.

Description

technical field [0001] The invention belongs to the technical field of risk assessment, and in particular relates to a risk assessment method for equipment operating under variable working conditions. Background technique [0002] Risk assessment is used to measure the possibility and magnitude of losses caused by or to the system. It quantifies the health, safety, and economic impact of each hazardous event by estimating the probability of the factors that lead to the occurrence of hazardous events. . Although for different engineering fields, risk assessment methods vary widely. In general, risk assessment methods can be divided into static assessment and dynamic assessment. But no matter which evaluation method is adopted, in engineering evaluation, domestic and foreign scholars have the same definition of risk, that is, risk has the duality of probability and consequence. Risk assessment of equipment operating status is actually a dynamic risk assessment method, becau...

AI Technical Summary

Problems solved by technology

However, in field application, during the use of equipment, there are a large number of adjustments to the operation of equipment process parameters, and its performance and status will gradually deteriorate over time and eventually lead to failures.

The change of process signal and the failure of equipment itself will lead to the change of equipment operation state, and the failure of equipment itself is the most important factor leading to the increase of equipment operation risk

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