工程车辆薄壁结构振动可靠性优化设计

Vibration reliability optimization design of thin-walled structure on engineering vehicles

工程车辆结构设计中常使用薄壁结构。爬梯作为典型薄壁结构件,需承受操作者重量以及路面不平顺和车辆本身结构引起的振动。当爬梯固有频率与路面激振频率重合时,会发生共振现象,此时结构易出现破坏。文章对某型工程车辆爬梯部件进行模态分析,研究其在特定工况下的振动特性,基于计算结果对结构进行优化。结果表明,优化后结构前6阶固有频率避开了路面激振频率范围,结构可靠性显著增强。

Thin-walled structures are often used in the design of engineering vehicles.As typical thinwalled structure,the ladder needs to withstand the vibration caused by the weight of the operator,the uneven road and the structure of the vehicle within.Resonance occurs when the natural frequency of the ladder coincides with the excitation frequency of the road,and the structure is prone to be destroyed.Modal analysis was carried out on the engineering vehicle ladder,and its vibration characteristics under specifi c working conditions were studied.Based on the calculation results,the structure was optimized.The results show that the natural frequency of the fi rst 6th order of the optimized structure avoids the excitation frequency range of the road,with the reliability of structure was signifi cantly enhanced.