Pyroshock responses of aerospace structures/systems are significantly important for design and valuation of space systems because it is a harsh environment for the systems, especially the electrical components. But the designers strongly rely on tests because, up to now, there have not been effective analytical and even numerical techniques for this problem. Fortunately, a number of researchers have been making efforts to build numerical techniques for structural responses prediction under this kind of special dynamic environments. This paper presents the techniques of time-history analysis, response spectrum analysis, statistical energy analysis and a synthetic technique composed of hydrocode analysis, time-domain finite element analysis (FEA) and statistical energy analysis. Further work and development trends are discussed in the end.

In space engineering, pyroshock (or pyrotechnical shock) environments induced by pyrotechnical devices are severe for space hardware, especially the inner electrical components. Thus pyroshock responses need to be well considered in the design and manufacture of a space structure or system. Because of the lack of efficient analytical technique, laboratory tests are of importance at present. This paper experimentally studies the pyroshock responses of a conical aeroshell. Two experiments were performed by ignitions of true pyrotechnical devices. A number of acceleration histories were measured and the corresponding shock response spectrums (SRSs) were analyzed. The results show that the responses, not only in time domain but also in frequency domain, have significant decaying characteristics along the axial distance from the pyroshock sources. The quantitative results provide us a good understanding of local environments for design of the components and the corresponding installations.

The cosine-distributed impulsive loads induced by intense soft X-ray radiation are often simulated by explosive rods in laboratory tests. The conventional design method of rods distribution needs a complicated process, by trials or optimization, to ensure the rod number as an integer. This paper proposes a simplified method based on the principle of load discretization and impulse equivalence. It has higher efficiency and more convenience, and can automatically let the rod number be an integer. This study provides an effective design tool for rod-explosive simulation tests of aerospace structures under intense soft X-ray radiation.

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