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首页> 外文会议>55th International Astronautical Congress 2004 vol.3 >ON THE DAMPING EFFECT DUE TO BOLTED JUNCTIONS IN SPACE STRUCTURES SUBJECTED TO PYRO-SHOCK
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ON THE DAMPING EFFECT DUE TO BOLTED JUNCTIONS IN SPACE STRUCTURES SUBJECTED TO PYRO-SHOCK

机译：受热冲击作用的空间结构中键结引起的阻尼效应

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摘要

The damping due to bolted or riveted joints in the dynamics of assembled structures subjected to pyro-shock has been studied. A relevant effect in this phenomenon is the micro-slip between the jointed surfaces. In order to verify the feasibility and the reliability of the numerical analyses performed on structures with junctions, the numerical results obtained by the Finite Elements Method have been compared with those obtained experimentally. Several numerical analyses, in which friction forces have been represented as non-linear loads, have been carried out for the FE models of two application cases: an electronic unit mounted within the Radarsat-2 satellite, and the complete Cosmo-Skymed spacecraft. Considering the load type, involving a typical high frequency response spectrum between 100 and 10000 Hz, both numerical and experimental data have been reduced to the Shock Response Spectrum form. After the comparative evaluation, taking into account also the damping effect, the agreement between numerical results and experimental data has been evaluated. The proposed numerical approach yields an effective and less expensive instrument, able to provide indications in the design phase, to allow the prevision of the dynamic behaviour of the structure for the prevention of failures in units or systems mounted within the spacecraft or launch vector. With the proposed model it is possible to determine in a simple and direct way the characteristics of the damping due to the single bolted and riveted joints, and use them in multiple similar joints in the complete structure assembling or sub-structuring.
机译：已经研究了在遭受热冲击的装配结构中，由螺栓或铆钉连接引起的阻尼。这种现象的相关影响是接合表面之间的微滑动。为了验证对具有结点的结构进行数值分析的可行性和可靠性，将通过有限元方法获得的数值结果与通过实验获得的数值结果进行了比较。对于两个应用案例的有限元模型，已经进行了一些数值分析，其中摩擦力已表示为非线性载荷：安装在Radarsat-2卫星中的电子单元和完整的Cosmo-Skymed航天器。考虑到负载类型，涉及典型的100至10000 Hz之间的高频响应频谱，数值和实验数据都已简化为“冲击响应频谱”形式。在进行比较评估之后，还考虑了阻尼效应，评估了数值结果与实验数据之间的一致性。所提出的数值方法产生了一种有效且较便宜的仪器，能够在设计阶段提供指示，以允许预知该结构的动态行为，以防止安装在航天器或发射矢量内的单元或系统发生故障。利用所提出的模型，有可能以简单直接的方式确定由于单个螺栓连接和铆钉连接引起的阻尼特性，并在完整的结构组装或子结构中将它们用于多个类似的连接中。

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