Ship mounting structure damping material optimization distribution and experimental study
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摘要:
目的 船舶基座结构是船舶减振的重要设备，为提高基座结构的减振效果，在结构表面敷设阻尼材料是常用手段。 方法 以基座结构的加速度振级落差为评价指标，应用各向正交惩罚材料密度法（SIMP），建立自由阻尼材料的拓扑优化数学模型。在优化模型中，其约束条件是确保在阻尼材料总使用量一定的情况下实现阻尼材料在基座结构表面的最优分布。最后，以某型船的主机基座为例，在建立的有限元模型的基础上，开展基座结构阻尼材料拓扑优化的数值计算，并利用基座模型实验的方法对拓扑优化数值计算结果进行实验验证。 结果 经验证，获得了阻尼材料的最优敷设方案。 结论 所得成果对船舶基座结构设计和复合材料的应用具有一定的参考价值。 Abstract:Objectives The mounting structure of a ship is an important piece of equipment for vibration reduction. In order to improve the vibration reduction effect of the mounting structure, damping material is often pasted onto its surface. Methods The vibration level difference of the mounting structure's acceleration parameters is defined as the evaluation index. Based on the Solid Isotropic Material with Penalization(SIMP) model, a topological optimization model of free damping material distribution is established. In the optimization formulation, the constraints ensure the optimal distribution of damping material on the surface of the structure while the total volume of damping material is certain. Finally, based on the Finite Element Model (FEM) of the structure, the optimal damping materials for the laying scheme are ascertained. The results of topological optimization are tested and verified by the model test. Results The optimal free damping material distribution of amounting structure is obtained. Conclusions The research results have value as a reference for the design of the mounting structures of ships and the application of composite materials. -
图 6 优化后评价点群的加速度幅值
Figure 6. Acceleration value of evaluation points after optimization
图 7 优化后评价点群的振级落差
Figure 7. Acceleration level difference of evaluation points after optimization
表 1 材料力学特性
Table 1. The mechanical properties of materials
材料 弹性模量E/ MPa 泊松比 损耗因子η 密度/（kg·m-3） 钢 210 000 0.30 0.001 7 800 阻尼材料 75 0.49 0.750 1 500 
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