直臂高空作业车臂架系统振动特性研究

摘要

The boom system of the widely used telescopic boom aerial work platform is as usual designed as a telescopic boom with stepped box sections.The vibration behaviors of boom system will influence the weight of structure and the vibration amplitude at platform,which determines the operating comfortableness and safety.Based on the Euler-Bernoulli beam bending vibration equation,the bending vibration equation of a stepped beam with tip mass was established.First three inherent frequencies of the boom system at full length and corresponding normalized eigenfunctions were acquired.The vibration equation was transformed into the state space.The vibration behavior of the boom's tip was simulated by using the Simulink with actual parameters of an aerial work platform,under the condition of varying the elevation angle of boom.The results provide a theoretical foundation for the vibration control of aerial work platforms.%作为一种普遍应用的直臂高空作业车，其臂架为箱型阶梯截面伸缩杆件形式，臂架系统振动特性直接影响结构重量以及作业平台处的振幅，决定着操作的舒适性和安全性。基于弹性体振动理论中的欧拉－伯努利梁弯曲振动方程，建立具有末端质量的变截面阶梯梁弯曲振动方程，得到全伸条件下的臂架系统前三阶固有频率和振型曲线，利用状态空间表述臂架振动方程，在 Simulink 环境下模拟已知臂架仰角变化条件下的臂头位置的振动特性，并通过实例求解得到了数值计算结果。此项研究为高空作业车的振动控制提供了理论依据。