柔性梁与带摆动荷载小车的耦合动力学分析

发布时间：2018-05-27 02:25

本文选题：柔性梁 + 摆动荷载　；参考：《西南交通大学学报》2017年02期

【摘要】：起重机桥架结构的振动以及荷载的摆动会使桥架结构产生疲劳损伤并影响荷载的精确定位.基于荷载、起重小车组成的椭圆摆与移动质量通过桥梁模型,起重机柔性梁与带摆动荷载的移动小车多体刚柔耦合动力学系统,并采用拉格朗日方程推导了耦合系统的运动微分方程组.采用Newmark-β逐步积分方法进行数值求解,分析了起重小车的运动速度、荷载质量等参数对桥架结构振动以及荷载摆动的影响.研究结果表明:起重小车的运行速度会影响桥架结构的振型,桥架结构的最大振动幅度与荷载质量成正比;耦合系统桥架结构中点的挠度比采用ANSYS软件计算的静挠度增大4%;荷载的摆动导致起重小车的驱动力与驱动功率周期性地改变,起重小车驱动力以及驱动功率变化的幅度范围正相关于起重小车的加速度值.
[Abstract]:The vibration of crane bridge structure and the vibration of load will cause fatigue damage to the bridge structure and affect the accurate location of load. Based on the load, the elliptical pendulum and moving mass of the lifting trolley pass through the bridge model, the flexible beam of crane and the multi-body rigid-flexible coupling dynamic system of the moving trolley with swinging load. The differential equations of motion of coupled systems are derived by Lagrange equation. The Newmark- 尾 step integral method is used to solve the problem. The effects of the moving speed and load mass of the crane on the vibration and load swing of the bridge structure are analyzed. The results show that the running speed of the crane will affect the vibration pattern of the bridge frame structure, and the maximum vibration amplitude of the bridge frame structure is proportional to the load quality. The deflection of the midpoint of the coupling system bridge structure increases by 4% compared with the static deflection calculated by ANSYS software, and the load swing causes the driving force and driving power of the crane to change periodically. The range of driving force and driving power change is positively related to the acceleration of the crane.
【作者单位】：西南交通大学机械工程学院;
【基金】：国家自然科学基金资助项目(51175442) 四川省应用基础研究计划资助项目(2013JY0136)
【分类号】：TH21

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