Bridge Crane Based On ANSYS Random Stress Spectrum Acquisition Method And Life

Along with the development of our country faster and faster, heavy industryincreasingly become a pillar industry of our country, and we can find a kind ofused for material handling machinery-crane from agriculture to industry, miningto construction, warehouse to wharf. And the bridge crane is used most widelyand the quantity is the largest recently, but also the highest accident rates and themost risk factors. A lot of accidents have been caused by bridge crane in thisindustry in recent years. In order to reduce accidents, bridge crane must be givena professional test in two years basically. Because each professional test willcost a lot of human resources and time, so we can make the simulation of bridgecrane. Using software for fatigue analysis and life assessment, In this way, wecan reduce the costs efficiently and can prevent the occurrence of accidentseffectively.For the first beginning, with75/30T double-beam bridge crane as anexample, we can obtain the technical parameters and the basic data of liftingconditions through field investigations and tests. With the way of attachingstrain gauge, we can obtain the stress-time history. Eventually, through dataprocessing and life calculation, we can obtain the life data under the testingmethod and provide comparative data for the simulation of finite elementanalysis software ANSYS.Secondly, using the large-scale finite element analysis software ANSYS tobuild bridge crane model and through static analysis under three full loadconditions, we can get the stress distribution cloud. And we can obtain thedangerous section after analysis and comparison with the stress distributioncloud. Again we can determine the final fatigue calculation point through theanalysis and comparison after the dynamics analysis, which can deduce thestress-time history of eight node of the dangerous sectionFinally, we can use the software ANSYS to make dynamic analysiswith one hundred lifting conditions gained from field investigation and test andsimulate the whole process of the lifting, moving and discharging. In this way, we can obtain the Stress-time history of all conditions. And through softwaresimulation and rain flow count for data processing, preparing stress spectrum,using the theories of modified miner fatigue cumulative damage to analyze lifeand evaluate residual life.In this paper, through two different methods, testing method and thesimulation method of finite element analysis software ANSYS, to analyzefatigue life of the box-shaped main girder of bridge crane. Then make theanalysis and comparison to the residual life from two different methods andconfirm the feasibility and practicality of the software simulation.