کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8057092 | 1519961 | 2013 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
ÎDsat, a QB50 CubeSat mission to study rarefied-gas drag modelling
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موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی هوافضا
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: ÎDsat, a QB50 CubeSat mission to study rarefied-gas drag modelling ÎDsat, a QB50 CubeSat mission to study rarefied-gas drag modelling](/preview/png/8057092.png)
چکیده انگلیسی
A CubeSat mission to study the impact of flow incidence angle, surface material and surface roughness on gas-surface interactions on spacecraft in low Earth orbits has been designed. To accomplish this scientific goal the CubeSat deploys a variable geometry aerofoil capable of exposing different surfaces to the flow at different incident angles. By using the on-board GPS measurements and an orbit determination technique the drag experienced by the CubeSat can be estimated. The CubeSat has been designed to be part of the QB50 mission, and hence it carries a sensor that can take in-situ measurements of the atmosphere. This is then used to estimate the atmospheric density and hence to extract information on the drag coefficient. To minimise any bias present in the measurement chain a differential approach is used. Therefore no absolute drag coefficients are estimated, instead, ratios of drag coefficients are computed. This allows direct comparisons of the drag coefficients of different materials, different surface roughness or different incident angles. Simulations indicate that this CubeSat mission will be able to obtain drag coefficient ratios with an uncertainty level of less than 5%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Astronautica - Volume 89, AugustâSeptember 2013, Pages 130-138
Journal: Acta Astronautica - Volume 89, AugustâSeptember 2013, Pages 130-138
نویسندگان
Josep Virgili, Peter C.E. Roberts,