Fatigue life assessment method based on a sample continuous increment rapid acquisition stress spectrum

Abstract

The invention discloses a fatigue life assessment method based on a sample continuous increment rapid acquisition stress spectrum. The method comprises the following steps: extracting sample data withcrane lifting load capacity and trolley position as input from a bridge crane data recorder in real time, and adopting a trained radial basis function neural network model to obtain an equivalent force value corresponding to any position point of the bridge crane under the condition that the sample data is continuously increased, so as to draw the time-stress curve of the point; according on therendered time-stress curve, obtaining a stress spectrum containing a mean value and an amplitude value by utilizing a rain flow counting method; and calculating the fatigue residual life of the main beam of the bridge crane by using a damage tolerance-fracture mechanics method. The method is used for predicting and evaluating the service life and reliability of the bridge crane girder in real time. The method solves the problem that the continuous increment of the sample data of the current universal bridge crane cannot be quickly acquired by time. And the stress curve obtains a stress spectrum for fatigue life analysis.

Description

technical field [0001] The invention belongs to the field of fatigue life estimation of cranes, in particular to a method for fatigue life evaluation based on rapid acquisition of stress spectrum based on continuous increment of samples, and is also applicable to fatigue life estimation of other types of cranes. Background technique [0002] As the lifting equipment for product lifting in the workshop, the bridge crane is characterized by intermittent movement, that is, the corresponding mechanisms for retrieving, moving, and unloading in a working cycle work alternately. The crane is in the market. The development and use of more and more widely. With the increase in the number of bridge cranes used, the safety accidents caused by the use of cranes are also on the rise, and once an accident occurs, the social impact will be bad and bring huge losses to the country and the people. According to statistics, the annual casualty accidents caused by hoisting machinery in my coun...

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Problems solved by technology

[0004] In order to solve the problem that the current general bridge cranes cannot quickly obtain the time-stress curve to obtain the stress spectrum for fatigue life analysis due to the continuous increase of sample data, a sample-based method is provided that is convenient and fast to obtain the time-stress curve and effectively calculate the fatigue life. A Method for Fatigue Life Evaluation by Continuously and Incrementally Acquiring Stress Spectrum Rapidly

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