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Comparative evaluation of test methods to simulate acoustic response of shroud-enclosed spacecraft structures

机译:模拟围罩航天器结构声响应的测试方法的比较评估

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摘要

Test methods were evaluated to ascertain whether a spacecraft, properly tested within its shroud, could be vibroacoustic tested without the shroud, with adjustments made in the acoustic input spectra to simulate the acoustic response of the missing shroud. The evaluation was based on vibroacoustic test results obtained from a baseline model composed (1) of a spacecraft with adapter, lower support structure, and shroud; (2) of the spacecraft, adapter, and lower structure, but without the shroud; and (3) of the spacecraft and adapter only. Emphasis was placed on the magnitude of the acoustic input changes required to substitute for the shroud and the difficulty of making such input changes, and the degree of missimulation which can result from the performance of a particular, less-than optimum test. Conclusions are drawn on the advantages and disadvantages derived from the use of input spectra adjustment methods and lower support structure simulations. Test guidelines were also developed for planning and performing a launch acoustic-environmental test.
机译:对测试方法进行了评估,以确定是否可以在没有护罩的情况下对在其护罩内进行了适当测试的航天器进行振动声学测试,并在声学输入频谱中进行调整以模拟缺失的护罩的声学响应。评估是基于从基线模型获得的振动声学测试结果,该基线模型包括(1)带有适配器,下部支撑结构和护罩的航天器; (2)航天器,适配器和下部结构,但无护罩; (3)只限航天器和适配器。重点放在替代护罩所需的声音输入变化的幅度以及进行这种输入变化的难度,以及可能由于特定的,低于最佳测试的性能而导致的误模拟程度。总结了使用输入光谱调整方法和较低的支撑结构模拟所产生的优缺点。还为计划和执行发射声环境测试制定了测试指南。

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  • 作者

    On, F. J.;

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  • 年度 1975
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