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A low frequency dynamic environment prediction of spacecraft using dynamic substructu- ring is presented. The dynamic environment could be used to describe the level of the excitation on the spacecraft itself and auxiliary equipment. In addition, the dynamic environment is a criterion for the structural dynamic design as well as the ground verification test. The proposed prediction method could solve two major problems. The first is the time consumption of analyzing the whole spacecraft model due to the huge amount of degrees of freedom, and the second is multi-source for component structural dynamic models from distributive departments. To demonstrate the feasibility and efficien- cy, the proposed prediction method is applied to resolve a launching satellite case, and the results were compared with those obtained by the traditional prediction technology using the finite element method. 相似文献
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在高温情况下,复合材料舱段连接会出现连接松动以及连接可靠性下降问题。以某飞行器复合材料端框高温情况下由于紧固件轴向膨胀量大,从而导致预紧力降低甚至消失问题为研究对象,研究了其预紧力变化的原因,并提出了一种改进连接形式,并分析了改进连接后结构变形情况。经分析可知,改进结构能够解决高温松动问题,而且这种新方式简单、便捷,可设计性好,可靠性高,适合工程应用。 相似文献
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为了避免爆炸螺栓分离解锁后引发高速冲击破坏及爆炸螺栓可能沿对接孔回弹的问题,在爆炸螺栓盒内设计挡片、弹簧片、缓冲块结构来降低爆炸螺栓盒受到的冲击,同时弹簧片上的耳片结构在爆炸螺栓回弹时对其卡滞防止爆炸螺栓突出分离面。采用ABAQUS显示动力学软件对爆炸螺栓通过弹簧片、最后撞击到缓冲块的过程进行动力学仿真分析,定量分析了挡片、弹簧片对爆炸螺栓冲击速度的影响,对冲击载荷下爆炸螺栓盒体强度进行评估,并开展爆炸螺栓收纳试验验证。结果表明:所设计的爆炸螺栓盒能够实现对爆炸螺栓的有效收纳,其盒体结构强度能够满足冲击载荷下的使用要求。 相似文献
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