摘要：从结构仿生的观点出发,提出了"孔壳夹芯结构"模型,通过模拟样件试验,归纳出了"孔壳夹芯结构"的压缩变形机制,得出"蛋壳夹芯结构"的承载能力主要取决于"蛋壳"的材料、结构尺寸和排列角度等因素的结论.应用薄壳理论,算出了"蛋壳"单元在承受均布压力情况下的屈曲临界压力,同时,对"蛋壳"单元建立有限元模型,进行了静力学和屈曲模态分析,为进一步的"蛋壳夹芯结构"的工程轻量化设计提供了理论依据.

摘要：屏蔽电机主泵定子屏蔽套的结构稳定性关系到其运行的安全性,基于薄壁圆筒外压屈曲稳定性理论对定子屏蔽套的失稳临界载荷进行了分析,采用Algor有限元软件分别计算了定子屏蔽套屈曲临界载荷和极限载荷,得到了定子屏蔽套屈曲临界载荷和极限载荷随其厚度、半径、长度以及初始缺陷变化的规律,结果表明,定子屏蔽套厚度是对结构稳定性影响最大的因素。

摘要：针对工程机械关键结构精密定位平台柔性支撑杆在结构设计上普遍存在屈曲失稳问题。首先基于瑞利-里兹能量变分法,建立计算精密定位平台柔性支撑杆屈曲临界载荷的数学模型并与有限元的Block Lanczos方法所求其前1阶屈曲载荷和屈曲模态进行对比,结果表明理论值与实验值偏差不大于0.26%,验证了基于瑞利-里兹能量变分法建模的准确性。最后对柔性支撑杆进行参数研究,发现长度比L/l与屈曲临界载荷呈反比例,直径比D/d小于1.5对屈曲临界载荷影响较大,倒角半径R与屈曲临界载荷正相关,为密定位平台柔性支撑杆的设计提供新的思路。

摘要：针对具有高稳定性、高起吊能力的未来超大型海上风电安装平台采用传统方形结构桩靴支撑桩腿面临的站立稳定性不足的问题,设计一种插桩深度可调的新型三支架型结构桩靴。与传统方形结构桩靴支撑桩腿相比,新型可调桩靴支撑的桩腿在不同入泥深度条件下的最大位移都较低且具有更高的屈曲临界载荷。新型可调桩靴结构提高了桩腿的站立稳定性,进而可以提高海上风电安装平台的稳定性。

摘要：用MSC Nastran对2种发动机盖支撑杆结构进行屈曲分析.计算结果表明,2种结构支撑杆的屈曲临界载荷均未超过稳定性要求,不同的结构形式具有不同的屈曲临界载荷和屈曲模态,撑杆结构是影响支撑杆稳定性的重要因素.第二种结构方案的屈曲临界载荷大于第一种方案,为设计部门选取更适合的方案提供参考.

摘要：Stiffened composite panels are used within many applications, from aerospace to marine applications. Stiffened panels are utilized for their high strength to weight ratio and flexibility of layups while counteracting the low stiffness exhibited by composites. Complications arise when attempting to utilize the full variability of layups in conjunction with reliability constraints creating a complex design problem when constrained by both buckling and material strength. To aid the process of optimizing the design of composite structures and layups, while ensuring a low mass, this paper presents a bi-level optimization scheme for minimization of the weight of tophat stiffened composite panels with probabilistic deflection constraints. To improve the computational efficiency, an energy based grillage method is formulated and applied for the investigation of buckling problems under bi-directional in-plane loads. The method is validated by comparing the results obtained from FE model calculations. The variables that have a large impact on the structural safety have been identified by both safety index and COV based reliability analysis. A parametric study of plate dimensions and loading ratios is conducted to investigate the coupling effects on critical buckling load. The method presented in this paper, makes it possible for engineers to improve their designs, at an early stage, with an integrated consideration between product performance and design parameters.