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Anson 2022-05-01 23:35:28 -07:00
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{"rule":"MORFOLOGIK_RULE_EN_US","sentence":"^\\QWikipedia gives a different definition^[Wikipedia: Characteristic Length] that defines characteristic length as the volume divided by the surface area.\\E$"} {"rule":"MORFOLOGIK_RULE_EN_US","sentence":"^\\QWikipedia gives a different definition^[Wikipedia: Characteristic Length] that defines characteristic length as the volume divided by the surface area.\\E$"}
{"rule":"MORFOLOGIK_RULE_EN_US","sentence":"^\\QCalculation of Characteristic Length, @hillMeasurementSatelliteImpact slide 9\\E$"} {"rule":"MORFOLOGIK_RULE_EN_US","sentence":"^\\QCalculation of Characteristic Length, @hillMeasurementSatelliteImpact slide 9\\E$"}
{"rule":"MORFOLOGIK_RULE_EN_US","sentence":"^\\QCurrently, algorithms have been made that are capable of getting many key features from solid ^A mesh with a surface that is fully closed and has no holes in its geometry.\\E$"} {"rule":"MORFOLOGIK_RULE_EN_US","sentence":"^\\QCurrently, algorithms have been made that are capable of getting many key features from solid ^A mesh with a surface that is fully closed and has no holes in its geometry.\\E$"}
{"rule":"MORFOLOGIK_RULE_EN_US","sentence":"^\\QThe summary is that using PCA determined that by far the most variance out of the current list of properties is captured by the principle moments of inertia.^Eigen Values of the inertia tensor.\\E$"}

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@ -266,7 +266,15 @@ CSV.write("scaled_dataset.csv", df)
--- ---
## Gathering Data ## Machine Learning
The rest of the document is an in depth look at the progress made characterizing the current fake
satellite dataset. The summary is that using PCA determined that by far the most variance out of the
current list of properties is captured by the principle moments of inertia.^[ Eigen Values of the
inertia tensor. ] I'm including this because it is already typed out and may be a good reference,
but likely isn't worth digging into once a new dataset of scans can be made.
### Gathering Data
To get started on the project before any scans of the actual debris are made available, I opted to To get started on the project before any scans of the actual debris are made available, I opted to
find 3D models online and process them as if they were data collected by my team. GrabCAD is an find 3D models online and process them as if they were data collected by my team. GrabCAD is an
@ -276,7 +284,7 @@ assemblies found on GrabCAD, below is an example of one of the satellites that w
![Example CubeSat Used for Analysis](Figures/assembly.jpg) ![Example CubeSat Used for Analysis](Figures/assembly.jpg)
## Data Preparation ### Data Preparation
The models were processed in Blender, which quickly converted the assemblies to `stl` files, giving The models were processed in Blender, which quickly converted the assemblies to `stl` files, giving
108 unique parts to be processed. Since the expected final size of the dataset is expected to be in 108 unique parts to be processed. Since the expected final size of the dataset is expected to be in
@ -331,7 +339,7 @@ matter for characterization. The dataset is available for download here:
- [scaled_dataset.csv](https://gitlab.com/orbital-debris-research/directed-study/report-3/-/blob/main/scaled_dataset.csv) - [scaled_dataset.csv](https://gitlab.com/orbital-debris-research/directed-study/report-3/-/blob/main/scaled_dataset.csv)
## Characterization ### Characterization
The first step toward characterization is to perform a principal component analysis to determine The first step toward characterization is to perform a principal component analysis to determine
what properties of the data capture the most variation. `PCA` also requires that the data is scaled, what properties of the data capture the most variation. `PCA` also requires that the data is scaled,
@ -390,12 +398,12 @@ different shapes and the extreme values are slender rods or flat plates while th
the center more closely resemble a sphere. As the dataset grows it should become more apparent what the center more closely resemble a sphere. As the dataset grows it should become more apparent what
kind of clusters actually make up a satellite, and eventually space debris in general. kind of clusters actually make up a satellite, and eventually space debris in general.
## Next Steps ### Next Steps
The current dataset needs to be grown in both the amount of data and the variety of data. The most The current dataset needs to be grown in both the amount of data and the variety of data. The most
glaring issue with the current dataset is the lack of any debris since the parts are straight from glaring issue with the current dataset is the lack of any debris scans since the parts are straight
satellite assemblies. Getting accurate properties from the current scans we have is an entire from satellite assemblies. Getting accurate properties from the current scans we have has proved
research project in itself, so hopefully, getting pieces that are easier to scan can help bring the exceedingly difficult, so hopefully, getting pieces that are easier to scan can help bring the
project back on track. The other and harder-to-fix issue is finding/deriving more data properties. project back on track. The other and harder-to-fix issue is finding/deriving more data properties.
Properties such as cross-sectional or aerodynamic drag would be very insightful but are likely to be Properties such as cross-sectional or aerodynamic drag would be very insightful but are likely to be
difficult to implement in code and significantly more resource intensive than the current properties difficult to implement in code and significantly more resource intensive than the current properties