排序方式: 共有57条查询结果,搜索用时 171 毫秒
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提出了光纤通道在火箭控制系统中的应用设想。首先介绍了光纤通道点对点结构、仲裁环形结构、交换结构在火箭控制系统的应用,然后针对目前火箭控制系统的特点,提出了一种光纤通道和其他航天数字总线混合的拓扑结构形式。这种形式可以适应火箭控制系统不同级段不同速率的要求,也可以满足目前总线系统过渡的需要。 相似文献
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基于准则法的阻尼结构拓扑优化 总被引:1,自引:0,他引:1
针对阻尼结构设计,利用拓扑优化技术研究了阻尼结构模态损耗因子最大化设计问题。采用 密度法(Pseudo\|density Method)和材料属性合理近似模型(Rational Approximation of Material Properties, RAMP)建立了以阻尼材料用量为约束条件、模态损耗因子最大化 的阻尼板结构拓扑优化数学模型,并进行了灵敏度分析;利用优化准则法(Optimality
criteria, OC),给出了阻尼结构拓扑优化设计方法和流程,得到了在一定阻尼材料用量下 阻尼板结构的模态损耗因子最大的阻尼材料最优分布构形。相关算例结果表明该方法适合于 阻尼结构的优化设计或轻量化设计。
相似文献
criteria, OC),给出了阻尼结构拓扑优化设计方法和流程,得到了在一定阻尼材料用量下 阻尼板结构的模态损耗因子最大的阻尼材料最优分布构形。相关算例结果表明该方法适合于 阻尼结构的优化设计或轻量化设计。
相似文献
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《中国航空学报》2023,36(4):496-509
In this paper, the thin-walled structures with lattices and stiffeners manufactured by additive manufacturing are investigated. A design method based on the multi-material topology optimization is proposed for the simultaneous layout optimization of the lattices and stiffeners in thin-walled structures. First, the representative lattice units of the selected lattices are equivalent to the virtual homogeneous materials whose effective elastic matrixes are achieved by the energy-based homogenization method. Meanwhile, the stiffeners are modelled using the solid material. Subsequently, the multi-material topology optimization formulation is established for both the virtual homogeneous materials and solid material to minimize the structural compliance under mass constraint. Thus, the optimal layout of both the lattices and stiffeners could be simultaneously attained by the optimization procedure. Two applications, the aircraft panel structure and the equipment mounting plate, are dealt with to demonstrate the detailed design procedure and reveal the effect of the proposed method. According to numerical comparisons and experimental results, the thin-walled structures with lattices and stiffeners have significant advantages over the traditional stiffened thin-walled structures and lattice sandwich structures in terms of static, dynamic and anti-instability performance. 相似文献
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针对卫星集群的无碰撞协同运动问题,提出了一种改进的蜂拥控制策略。首先,结合Prim算法和广度优先算法设计了一种计算度、半径约束最小生成树的拓扑优化方法,并将优化结果作为星群的通信拓扑。该方法不仅能够节省每个卫星的通信资源,还能够减少星群网络的通信延迟。随后,为提高参考轨迹生成的快速性,采用基于傅里叶级数的形状曲线逼近法对主星参考轨迹进行规划。在此基础之上,提出了一种考虑通信延迟与碰撞规避的蜂拥控制策略,使星群能够在保证通信连通性的前提下沿参考轨迹运动到目标点附近,并且在运动过程中不发生碰撞。经过理论分析,利用Lyapunov Razumikhin定理证明了卫星集群系统能够达到渐近稳定。最后,通过数值仿真验证了所提控制策略的正确性和有效性。 相似文献
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《中国航空学报》2023,36(8):182-206
For the stress-constrained topology optimization of a turbine disk under centrifugal loads, the jagged boundaries of the mesh and the gray densities on the solid/void interfaces could make the calculated stress field inconsistent with the actual value. It may result in overestimating the maximum stress and thus affect the effectiveness of stress constraints. This paper proposes a new method for predicting the maximum stress to overcome the difficulty. In the process, a predicted density is newly defined to obtain stable boundaries with thin layers of gray elements, a transition factor is innovatively proposed to evaluate the effects of intermediate-density elements, two different stiffness penalty schemes are flexibly used to calculate the elastic modulus of elements, and a linear stress penalty is further adopted to relax the stress field of the structure. The proposed approach for predicting the maximum stress value is verified by the analysis of a structure with smooth boundaries and the topology optimization of a turbine disk. An updating scheme of the stress constraint in the topology optimization is also developed using the predicted maximum stress. Some key ingredients affecting the optimization results are discussed in detail. The results prove the effectiveness and efficacy of the proposed maximum stress prediction and developed stress constraint methods. 相似文献