摘要：采用拓扑优化方法对含多种多孔材料的结构进行结构与材料微结构构型一体化设计,可以获得具有优良力学性能的结构设计。该文面向多晶胞双尺度结构的时域动刚度最优设计问题,考虑不同晶胞间的可连接性,并行设计微结构的构型及其宏观布局。首先,引入双Helmholtz平滑-分块投影方案,识别不同多孔材料的宏观结构域。其次,通过均匀化方法计算多孔材料的宏观等效力学性能,利用有序SIMP(soid isotropic material with penalization)方法优化不同微观结构的宏观布局。同时,为了保证不同晶胞间的可连接性,在不同多孔材料微结构的边界区域设置为相同拓扑描述的可设计连接域。然后,基于先离散-后微分的伴随敏度分析方法,实现了时空离散动力系统的一致性敏度计算。最后,以双尺度结构动柔度最小化为目标,以材料用量为约束条件,提出了时域动载荷作用下多微结构多尺度并行动力学拓扑优化方法。数值算例结果表明,提出的优化方法能够实现多晶胞结构的构型与宏观布局设计,充分提高了多孔结构的承载性能,同时保证不同晶胞之间的几何连续性,研究结果可为高承载多孔材料结构设计提供理论参考。

摘要：针对涡轮旋转机械的叶片所处的高温、高压及复杂多场环境,建立其弯曲和扭转两自由度耦合的截面模型,研究了来流速度对振幅的影响。利用平均法和能量法原理,得到了系统在发生临界颤振时的幅频关系以及在能量输入输出情况下系统的稳定性关系,避免了颤振发生引起的气动弹性设计失效问题,从而对叶片的优化设计提供理论依据。

摘要：基于多维系统阻抗分析的观点，综合考虑隔振器驻波效应和柔性基础的动态特性。运用子结构导纳综合法，推出了相应的隔振效果解析公式；探讨了柔性基础与刚性基础情况下驻波效应的差别；分析了基础的动态特性、质量比及阻尼对驻波效应的影响规律；提出了高频隔振设计的途径．

摘要：Searching for the optimal cabin layout plan is an efective way to improve the efciency of the overall design and reduce a ship’s operation *** multitasking states of a ship involve several statuses when facing diferent missions during a voyage,such as the status of the marine supply and emergency *** human fow and logistics between cabins will change as the state *** ideal cabin layout plan,which is directly impacted by the above-mentioned factors,can meet the diferent requirements of several statuses to a higher *** deviations exist in the quantifcation of human fow and ***,uncontrollability is present in the fow situation during actual *** coupling of these deviations and uncontrollability shows typical uncertainties,which must be considered in the design ***,it is important to integrate the demands of the human fow and logistics in multiple states into an uncertainty parameter *** research considers the uncertainties of adjacent and circulating strengths obtained after quantifying the human fow and *** numbers are used to integrate them,a two-layer nested system of interval optimization is introduced,and diferent optimization algorithms are substituted for solving *** comparison and analysis of the calculation results with deterministic optimization show that the conclusions obtained can provide feasible guidance for cabin layout scheme.

摘要：以准确预测高频隔振效果为目的,基于多维系统阻抗分析的观点,采用子结构导纳分析法,研究了非对称性和多支承间的耦合作用对柔性多支承隔振系统的隔振效果之影响,首先系统地导出任意多支承非对称柔性隔振系统的传递率及响应此的解析表达式,进而分析各种参数情况下非对称性对隔振效果的影响,揭示系统的各动态特性参数对隔振效果的影响规律,并给出实际系统可作对称简化处理的数量界限,从而为高频隔振效果的准确预测以及合理有效的隔振设计提供依据。