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机载雷达的设计不仅要满足刚强度要求,而且要满足轻量化要求。文中采用拓扑优化方法对某机载雷达天线座结构进行了优化设计,以体积最小化为设计目标,单元密度为设计变量,节点位移限制为约束条件。将优化后的方案与最初设计方案进行对比发现,在结构重量减轻的同时,结构的刚强度得到了明显的提高。这也表明,拓扑优化方法非常适合于机载雷达特别是天线座的结构设计。 相似文献
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冲击是挂架面临的多种严酷力学环境考验之一,在冲击试验中,某挂架中罩连接螺钉孔多处发生开裂失效。文中应用Ansys有限元软件对该结构进行了瞬态动力学仿真,首先得出该中罩螺钉孔上所承受的载荷,然后考虑材料非线性的影响,对螺钉孔进行应力分析,得出螺钉孔上的应力大于材料的抗拉强度,结构不满足强度要求,分析结果与试验结果一致,为今后在此方面的设计工作提供参考方法。 相似文献
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对某导弹挂架在随机载荷作用下进行有限元动态仿真分析,基于随机谱分析基础,利用基于高斯分布和Miner线性累计损伤定律的三区间法对某导弹挂架进行了随机振动疲劳环境分析。分析得到:导弹挂架结构在飞机给定随机激励下的应力响应特征以及导弹挂架结构疲劳危险区域为耳片;根据材料疲劳特性,计算得到挂架结构空载及加载情况下的振动疲劳寿命系数,由寿命系数可知结构满足其寿命要求。 相似文献
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刚强度/重量比最优是舰载铸铝密闭机柜的设计目标。为满足设计要求,对机柜进行了结构优化分析。采用拓扑优化方法确定了机柜加强筋布局;通过手工优化和有限元刚强度分析计算,确定了加强筋截面参数、板厚等具体设计参数。结果表明该机柜动态特性可满足设计要求。 相似文献
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Topology optimization is very useful engineering technique especially at the concept design stage. It is common habit to design
depending on the designer’s experience at the early stage of product development. Structural analysis methodology of compressor
bracket was verified on the static and dynamic loading condition with 2 bracket samples for the topology optimization base
model. Topology optimization is able to produce reliable and satisfactory results with the verified structural model. Base
bracket model for the topology optimization was modeled considering the interference with the adjacent vehicle parts. Objective
function was to minimize combined compliance and the constraint was the first natural frequency over 250 Hz. Multiple load
cases such as normal mode calculation and gravity load conditions with 3-axis direction were also applied for the optimization,
expecting an even stress distribution and vibration durability performance. Commercial structural optimization code such as
optistruct of Altair Engineering was used for the structural topology optimization. Optimization was converged after 14 iterations
with the satisfaction of natural frequency constraint. New bracket shape was produced with the CATIA based on the topology
optimization result. The new bracket from topology optimization result was compared with the traditional concept model and
topology optimization base model under 4 load cases. 14 % 1’st natural frequency of new bracket with only 4 % mass increment
increased compared to the concept model. 31 % mass decreased compared to the base model without the increment of stress under
gravity load cases. It was analyzed thata new bracket would not fail during a vibration durability test, and these results
were verified with a fabricated real sample under the durability condition. 相似文献
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拓扑优化方法在雷达天线座的减重设计中具有突出优势,特别适合于大型精密雷达和机载雷达天线座的结构优化设计。文中建立了连接支架的拓扑优化模型,以单元密度为设计变量,体积分数上限为约束条件,加权应变能最小化为优化目标,对机载SAR天线座连接支架进行了拓扑优化设计。考虑到结构美观和制造性,添加了对称平面约束和拔模约束。结果表明:拓扑优化结果符合仿生学原理,在减轻质量的同时,也提高了结构性能。 相似文献
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在航天领域,星上载荷的质量直接影响整星的发射成本。为了降低星上天线的质量,文中以某卫星测控天线支架为研究对象,在满足天线电性能和力学性能的前提下,采用传统方法和拓扑优化分别对支架进行改进设计,然后利用有限元分析软件Workbench对天线进行仿真分析,得到模态响应曲线和正弦振动应力云图,并对比分析仿真结果,获得支架的最优结构设计方案。该支架通过拓扑优化设计并采用增材制造(3D打印)技术加工,不仅满足各项性能指标要求,而且其质量降低了20.3%,加工时间也缩短了近60%。 相似文献
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