【摘要】 为探究横风对云梯消防车臂架的变形及振动特征的影响，采用有限元软件研究不同横风风速条件下云梯臂架的结构振动规律。臂架的风载变形主要体现在副臂在风载作用下的摆动，以偏心力矩造成的弯曲变形为主。臂架在外载荷与周期性变化的内应力共同作用下产生了低频震源，激发了臂架的低阶模态，云梯消防车臂架形变呈现出周期性振动的特征，随着风速的增加，振动幅度逐渐增大。基于该研究成果提出了一种解决方案，可为改良云梯消防车的设计提供思路。更多还原

【Abstract】 The influence of cross wind on the deformation and vibration characteristics of the boom of the ladder fire truck is explored, finite element software was used to study the structural vibration law of ultra-high ladder boom under different wind speed conditions. The wind load deformation of the boom is mainly reflected in the swing of the auxiliary arm under the action of wind load, and the bending deformation caused by eccentric moment is mainly used. Under the combined action of external load and periodic internal stress, the boom produces a low-frequency source that excites the low-order mode of the boom. The deformation of the boom of the raised fire truck shows the characteristics of periodic vibration, and the vibration amplitude gradually increases with the increase of wind speed. Based on the research results,this paper proposes a solution that can provide ideas for the design of improved ladder fire trucks.更多还原