Acoustic Emission Detection and Location for Hypervelocity Impacts
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摘要: 当高速运行的空间碎片撞击到在轨运行的航天器时，会对结构产生损伤，如果能够判断撞击的位置及产生损伤的严重程度，就可以及时采取相应的措施保证航天器和航天员的安全。通过利用高速弹丸撞击铝板产生的损伤模拟上述撞击，采用声发射检测技术，对撞击事件的定位进行了探索。在试验过程中，采集弹丸高速撞击铝板产生的撞击信号，并对应力波到达各个声发射传感器的时差进行分析，通过二维矩形平面定位算法，对损伤部位进行了初步定位。试验结果表明，声发射在撞击源定位方面具有适用性。Abstract: There is already so much space debris in low orbits that it poses a significant threat to satellites and other spacecrafts in orbit. The satellites and the spacecrafts will lose their functions when space debris impacts on the key parts of them. Hypervelocity impacts on aluminum plates are utilized to simulate the impacts resulted from space debris. Acoustic emission (AE) analysis is used for characterization and location for hypervelocity Impacts. Two different Acoustic Emission (AE) sensors are used to detect the arrival time and signals of the hits. Hypervelocity Impacts are generated with a two-stage light-gas gun firing small aluminum ball projectiles(3.97 mm, 6.35 mm). In the impact studies, the results make clears that the location obtained by the resonant R15 sensors are as excellently accurate to these obtained by wideband sensors. The multi-source impact simultaneously is observed during the impacts in that it is difficult for the current conventional localized-algorithm to locate the sources.
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Keywords:
- Acoustic emission testing /
- Space debris /
- Hypervelocity impact /
- Localization
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