高强度钢舱段浮筏基座结构声学设计

Structure-acoustic design of floating foundation in high strength steel cabin

[目的]提出一种同时满足声学阻抗适配和力学刚度匹配要求的高强度钢舱段浮筏基座设计方案。[方法]以某典型浮筏基座为研究对象,采用不与耐压壳体连接的结构形式,调整基座结构参数,通过有限元建模分析,对原始基座和改进基座结构的阻抗特性与固有频率进行多方案计算分析,并对考虑基座影响的耐压船体强度进行校核,获得满足设计要求的浮筏基座方案。[结果]计算结果表明,改进基座阻抗幅值增加,固有频率与设备特征频率的耦合性降低,耐压船体的强度满足规范要求,重量增加在接受范围以内。[结论]该浮筏基座设计方案可为兼顾声学和力学特性的高强度钢舱段内大型基座设计提供参考。

[Objectives]This paper proposes a design for a floating foundation of a high strength steel cabin which simultaneously meets the requirements of impedance adaptation in acoustics and stiffness matching in mechanics.[Methods]Typical floating foundations which are not connected with the pressure hull are studied by adjusting the structural parameters of the foundation,analyzing the impedance characteristics and intrinsic modes with the finite element method,and calculating the strength of the pressure structure along with the original and improved foundations.A scheme of a floating foundation which satisfies the design requirements is obtained.[Results]The results show that the amplitude of the improved foundation is increased,the coupling of the intrinsic modes of the foundation with the mechanical equipment is reduced,the strength of the pressure satisfies the specification requirements,and the added weight is within the acceptable range.[Conclusions]This floating foundation scheme can provide references for the design of large foundations for high strength steel cabins which take into account both acoustic and mechanical requirements.