高传递损失基座阻抗优化设计法

Impedance optimization design of base structures with high transmission loss

提出基于阻抗优化的高传递损失基座设计法,定义高传递损失的量化关系。该方法基于阻抗级和阻抗级落差描述基座的减振效果,通过阻抗综合优化设计获得高传递损失基座。以某水面舰船为例,采用有限元方法对舰船舱段内的基座进行频响分析,通过单点激振单点拾振、单点激振多点拾振的阻抗计算实例,验证了利用阻抗级来描述舰船基座减振效果的可行性。基于Isight平台的近似代理模型优化方法,对基座系统中方钢不同拓扑布局进行了分析,以方钢布置尺寸为设计变量实现了多因子阻振优化设计。高传递损失基座的阻抗优化设计方法可为工程中基座减振设计提供参考。

The design method for base structures with high transmission loss based on the impedance optimization was studied, and the quantitative relationship about high transmission loss was defined. By introducing the concept of impedance magnitude, a method describing the damping effect of base structures was proposed based on the impedance magnitude level, and the design method for base structures with high transmission loss was put forward through the impedance integrated optimization. Taking a surface vessel as a computational example, the vibration response characters of the base structure of its hold frame were analysed by using the FEM software, in which the technique of single point excitation and multi points responses was adopted to compute the impedances. By the example, it was validated that describing the damping effect of base structures of ships by using the concept of impedance magnitude level is feasible. By virtue of the approximation agent model optimization method in the Isight, platform, the topological lay-out of square stell elements in different locations on the pedestal frame system was investigated, where the square steel parameters were taken as design variables to realize the multi-factor composite resistance vibration optimization design. A set of impedance optimization design methods for high transmission loss base structures were proposed, which provides pratical engineering ways to improve the vibration reduction performance of base structures.