综合考虑减振与抗冲击性能的复合基座设计方法

A vibration and shock isolation synthesis design method for hybrid base

常规基座减振与抗冲击性能在设计中难以兼顾,为此提出了一种利用蜂窝构建负泊松比效应,采用组合结构型式,结合结构动力学优化设计技术的新型减振与抗冲击复合基座设计方法。以某舰用设备基座为例,采用数值方法,对新型复合基座减振与抗冲击机理进行研究。研究表明,常规面板、常规肘板和蜂窝腹板组合式复合基座减振抗冲击是利用了阻抗失配和蜂窝结构吸能两种效应。建立了以基座面板厚度、肘板厚度和腹板蜂窝胞元壁厚为设计变量,在单一减振指标约束和减振抗冲击双指标约束下的复合基座动力学优化设计模型。数值优化结果证明,采用新型负泊松比效应蜂窝腹板组合结构,利用减振及抗冲击双指标约束下的动力学优化设计模型,可设计出减振与抗冲击能力俱佳的复合基座。

To meet the new requirements of vibration reduction and shock resistance, a novel hybrid base consisting of face plates, brackets, and auxetic honeycomb sandwich web plates was proposed by the structural dynamics optimization method. Taking a naval ship transformer base as an example, vibration reduction and shock resistance mechanisms of the hybrid base were conducted by numerical simulation methods. The results reveal that the impedance mismatch effect and energy-absorbing characteristics of cellular materials play an important role in the new hybrid base. Dynamics optimization models of the hybrid base designed with thickness of face plates, brackets, and honeycomb cells as variables were investigated in two cases, one with vibration reduction performance constraints and the other with both vibration reduction and shock resistance performance constraints. Optimization results indicate that by applying the auxetic honeycomb hybrid structure and synthetic dynamics optimization design, excellent performance in vibration reduction and shock isolation can be obtained in the base design.