新型近等强度高阻尼航天载荷隔振器研究

New quasi-equal strength and high damping isolator for spacecraft payload

针对某航天载荷,设计出一种新型的具有近等强度、高阻尼、兼顾冲击保护等特点的航天载荷隔振器。考虑到安全性对于航天应用尤为重要,在隔振器支架的设计中引入了等强度理论,将应力集中现象显著降低,与未应用等强度设计的结构相比,安全系数提高了0.4倍。在隔振器阻尼材料的设计中,应用阻尼材料能量耗散理论及Rongong修正模态应变能方法,设计了新颖的梳状剪切型阻尼结构。这种结构使隔振器具有高等效阻尼比。同时,所设计的隔振器等效阻尼比处于最佳冲击衰减性能的范围。最后,通过由30个隔振器组成的隔振系统的正弦扫频与随机振动试验验证了隔振器能有效抑制中低频共振,衰减宽频带上随机振动。

A new isolator mainly having features of quasi equal strength, high damping and shock protection was designed and developed for a certain type of spacecraft payload. Considering security being particularly important in field of spacecraft, the isolator bracket was designed with equal strength theory, the stress concentration was significantly reduced and the safety factor increased about 40%. Energy dissipation theory of damping materials and Rongong modification method of modal strain energy were used to design a novel staggered comb structure with a high damping ratio. At the same time, the equivalent damping ratio was designed into the optimal range of shock attenuation. Finally, experimental results of a vibration isolation system consisting of 30 such isolators showed that these new isolators can effectively suppress both lower frequency resonances and random vibration within a broad frequency band.