1 / 22

Study of Dust Detection System on a Micro Satellite

Study of Dust Detection System on a Micro Satellite. Space Systems Dynamics Laboratory M2 Kyohei Nakashima. Contents. Objective Background Dust Detection System Acoustic Emission Method Experiments Results Conclusions. Objective.

cisco
Download Presentation

Study of Dust Detection System on a Micro Satellite

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Study of Dust Detection System on a Micro Satellite Space Systems Dynamics Laboratory M2 Kyohei Nakashima

  2. Contents • Objective • Background • Dust Detection System • Acoustic Emission Method • Experiments • Results • Conclusions

  3. Objective • Analysis and verification of dust detection system on a micro satellite using Acoustic Emission sensors

  4. Background • Space weather forecast is necessary because space disasters threaten human space activities. • Space disasters • Magnetic storm • High energy particlesradiation • Space debris Sun flares Space debris Magnetic storm Radiation Earth

  5. Dust Detection System • Observation of surfaces of spacecrafts recovered • Example: LDEF (Long Duration Exposure Facility,), EURECA (European Retrievable Carrier ),SFU (Space Flyer Unit) G. Drolshagen, ESA/TOS-EMA21th IADC, 10-13 March 2003, Bangalore, India • High cost • Low Earth Orbit only

  6. Acoustic Emission Method • Acoustic Emission (AE) is an elastic wave motion phenomenon in a solid. • AE occurs when an impact happens on a solid or when destruction happens in a solid. Impact destruction

  7. Acoustic Emission Method • Impact position can be detected by solving the following equations. z S(x, y, z) TN(aN, bN, cN) T1(a1, b1, c1) y Ti(ai, bi, ci) T0(a0, b0, c0) S(x, y, z): Impact position Ti(ai, bi, ci): i th AE sensor position ve: Wave velocity ti: Arrival time of a wave at i th AE sensor x

  8. Experiments • Two experiments were performed by • free fall. • a light gas gun. • Experiments by free fall are in preparation for impacts by a gas gun. • Experiments by a gas gun are representative of impacts in space.

  9. Experiments • Free fall • 4 different types of panel and 1 type of projectile were used in free fall. • Projectiles were dropped from 380 mm above position of panels. • Impact velocity was about 2.7 m/s.

  10. Experiments • Results of experiments by free fall Aluminum alloy panel CFRP layered panel

  11. Experiments • Results of experiments by free fall Aluminum honeycomb sandwich panel Aluminum honeycomb sandwich panel with CFRP face sheets

  12. Experiments • Gas gun • 4 different types of panel and 1 type of projectile were used in a gas gun. • Impact velocity was about 668.4 m/s. • Vacuum level was about 1.0*103 Pa

  13. Experiments • Results of experiments by a gas gun Aluminum alloy panel CFRP layered panel

  14. Experiments • Results of experiments by a gas gun Aluminum honeycomb sandwich panel Aluminum honeycomb sandwich panel with CFRP face sheets

  15. Results • Aluminum alloy panel • compared real impact position with predicted impact position on experiments by free fall

  16. Results • CFRP layered panel • compared real impact position with predicted impact position on experiments by free fall

  17. Results • Aluminum honeycomb sandwich panel • compared real impact position with predicted impact position on experiments by free fall

  18. Results • Aluminum honeycomb sandwich panel with CFRP face sheets • compared real impact position with predicted impact position on experiments by free fall

  19. Results • Compared real impact position with predicted impact position on experiments by a gas gun Aluminum alloy panel CFRP layered panel

  20. Results • Compared real impact position with predicted impact position on experiments by a gas gun Aluminum honeycomb sandwich panel Aluminum honeycomb sandwich panel with CFRP face sheets

  21. Results • Aluminum alloy panel Error- 5.7 % of the distance of sensors • CFRP layered panel Error- 8.4 % of the distance of sensors • Aluminum honeycomb sandwich panel Error- 5.7 % of the distance of sensors • Aluminum honeycomb sandwich panel with CFRP face sheets Error- 7.6 % of the distance of sensors

  22. Conclusions • Dust detection system is possible by using AE sensors. • It is more difficult to decide the arrival time accurately in panels using CFRP and honeycomb sandwich. • Buffers are needed to relieve the impacts to AE sensors. • There are little influence of holes by impacts to detect the impact points.

More Related