Advanced Applicalions of Mg Alloys on Adaptive Structures for Aerospace Environment

(1)为提高超声速颤振临界动压力，减小镁合金板翼结构质量，提出了基于演化结构优化的结构同步优化程序。考虑两种灵敏度，建立了基于演化结构优化的结构同步优化程序。采用镁合金三角翼模型进行了数值验证，验证了优化过程的性能和优化设计的性能。数值结果表明，在一定的尖端变形约束条件下，采用镁合金的优化设计在不影响临界动压和结构质量的情况下具有较好的性能。阐明了质量分布和刚度分布对优化设计的影响。(2)为满足航天发射任务的要求，将镁合金应用于尺寸为305ml的微型卫星CanSat。对卫星结构的设计、减重效果以及镁合金精密零件的制造工艺和表面处理等问题进行了研究。(3)为提高结构的性能，提出了采用镁合金设计结构的可靠性设计技术，并提出了基于可靠性设计的优化算法，以减小结构的总质量。

(1)Simultaneous structural optimization procedure was proposed to improve the critical dynamic pressure for supersonic flutter and to reduce the structural mass of plate wing using Magnesium alloys with an optimization procedure based on Evolutionary Structural Optimization. Simultaneous structural optimization procedure based on the Evolutionary Structural Optimization was formulated by considering the two types of sensitivities. A delta wing model with Magnesium alloy was used for the numerical demonstration to examine the performance of the optimization procedure and the properties of the optimum design. The numerical results indicated that the optimum design with Magnesium alloys had the better performance without conflicting of the critical dynamic pressure and structural mass under a given constraint for the tip deformation. Also, the effects of mass and stiffness distribution on the optimum design were clarified.(2)Mg alloys were applied to a CanSat whose is a pico-satellite sized of 305ml can, to reduce the total mass for the requirements for the space launching mission. The design of the satellite structures, the effects of mass reduction, and the issues of manufacturing processing and surface treatment for the elaborate magnesium parts were investigated.(3)The reliability design techniques for designing structures using magnesium allyos were developed to improve the performance of the structures, and the optimization algorithms based on the reliability design were also developed to reduce the total mass.