Method and system for health assessment of crane hydraulic system

Abstract

The invention relates to a method and a system for evaluating health of a crane hydraulic system. The method and the system for evaluating the health of the crane hydraulic system comprises the following steps of: collecting hydraulic oil pressure, flow rate per unit time and temperature information of each part of an entire hydraulic system; reasoning obtained hydraulic oil pressure and flow rateper unit time of each part, judging whether current flow rate and pressure in the entire hydraulic system are normal or not, and thereby judging a state of the entire hydraulic system and existing problems; determining the current crane work state and difference between the current state and a standard state according to the hydraulic oil pressure and the flow rate per unit time obtained in eachpart of a data acquisition step, and accurately determining the state of the current hydraulic system and the existing problems by combining a knowledge reasoning step. The method and the system for evaluating the health of the crane hydraulic system combine knowledge reasoning and multi-class Gaussian discriminant analysis method, improve accuracy and reliability of a health evaluation result ofthe crane hydraulic system, and solve a problem of inaccurate evaluation in general health assessment.

Description

technical field [0001] The invention relates to the technical field of health assessment of a hydraulic system of a crane, in particular to a method and system for health assessment of a hydraulic system of a crane. Background technique [0002] The hydraulic system is an important part of power transmission and control in construction machinery, and its operating status directly affects the working status of construction machinery. Therefore, an accurate and efficient health assessment of the crane hydraulic system is of great significance to ensure the normal operation of construction machinery. [0003] After searching, the Chinese invention patent application with the publication number CN104061208A discloses an online fault diagnosis method for hydraulic systems, which uses the Euclidean distance between the eigenvectors of the hydraulic system and the standard eigenvectors and Bayesian reasoning to evaluate the health of the hydraulic system, but Applying this method ...

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Problems solved by technology

[0006] Aiming at one of the existing problems in the prior art, the present invention provides a crane hydraulic system health assessment system and method, which provides matching calculations for collected pressure signals and flow signals, and judges whether there are problems such as flow leakage and pressure loss. At the same time, Using the method of Gaussian discriminant analysis combined with knowledge reasoning, analyze whether there are abnormal conditions such as hydraulic shock and cavitation in the hydraulic system, so as to realize the health assessment of the hydraulic system of the crane

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