摘要
Abstract
The boom is a critical working component of a full-circle slewing floating crane,and the amplitude and lifting height are controlled by the luffing rope tension.When the boom elevation is large,a sudden drop of the lifted load can cause the structure to rebound backward and threaten crane safety.To investigate the dynamic response of the boom during unloading,a simplified mechanical model was established and the maximum impact force exerted by the boom on the anti-tipping stop was derived by energy conservation.A finite element model was then built,and transient dynamic analysis gave the stress-time history of the anti-tipping stop after load release,confirming the accuracy of the hand calculation.The small relative error shows the analytical derivation is reliable and practical.Finite element simulations further trace the axial-force evolution in the boom's main and branch chords after unloading,revealing noticeable stress increases in several members and demonstrating the necessity of checking the structure against sudden load release.关键词
浮式起重机/臂架/卸载/动力学/模型Key words
floating crane/boom/unloading/dynamics/model分类
机械制造
