Finite Element Analysis Of Metal Structures Of Offshore Wind-Power Lifting Equipment

In the current situation of energy crisis, wind-power generation is the project devotedstrongly by different counties in the world. Wind installation is the pivotal technology forwind-power generation. The crane which is used to install wind-power generator, requireshigh lifting capacity and lifting height. Wind-power installation on the sea is more difficultthan on the land, so all the countries invest a lot of people and fund to study the wind-powerlifting equipment. In the process of installing wind-power generator, many factors like thegreat impact act on crane, which will affects the safety of wind-power installation directly.Therefore, this article studied many important techniques including stress of the crane whichis used to lift wind-power generator. The main research work contains:1) Strength and stiffness analysis of crane’s critical metal structureThrough analyzing the classical theory of crane, the design and verification based onthe crane’s classical theory of a crane which has460tones lifting capacity and100meterslifting height were completed. Finite element model of the metal structure was established.According to the analysis of dangerous working condition, constraints and loads of thecrane were accomplished. Through static analysis of the crane boom, stress anddisplacement plots of different integrant metal structure in the dangerous working conditionwere gained. The stress concentration and the danger zone of these parts were achieved,which provides a reference for designing cranes.2) Modal analysis of crane boomThrough analyzing the modal of crane boom system, foremost6-order type reactionand vibrational frequency which reflect the vibration property of crane boom were obtained.The results gained by studying the vibration caused by motor start or cargo deflection whencrane system is working, was compared with the natural frequency of crane boom obtainedfrom modal analysis. The comparing result proves that the design of crane boom structure isreasonable.3) Transient analysis of crane boomFinite element analysis software ABAQUS was used to analyze the transientcharacteristics of crane boom in different start-up modes and impact loads. The stress anddisplacement plot and dangerous part in the impact loading condition were gained. Finally,through the transient dynamic analysis of crane boom in four kinds of lifting condition, vertical displacement, velocity and acceleration and response of lifting load suffered overtime course were obtained when crane boom system was in different start situation. Theanalysis provides the working condition of crane for operators and reference for futuredesigners of cranes, which verifies the correctness of the modeling and solution of crane inthis paper further.