流劲式起重机伸缩臂架自振频率的计算

Calculation of free frequency of mobile crane' s telescopic jib

臂架是起重机金属结构的重要部件之一,其工作状态影响起重机的工作性能。通常臂架自振频率的计算多关注于工作平面,而对垂直于工作平面的臂架自振频率的计算则被忽视。文中根据流动式起重机臂架在垂直于工作平面的受力状态,建立了计算模型,并推出最低自振频率计算式。

The jib is one of the most important metal parts of crane and its working state influences the crane's working performance . The existing calculations for free frequency of the jib involve the vibration in the working plane and the vibration in the direction perpendicular to the working plane is usually neglected. In this paper, the calculation model of free frequency is built and the formula for the minimum free frequency derived based on the analysis of loads in the direction perpendicular to the working plane.