diff --git a/atom.xml b/atom.xml index 2ba614f..4e6b5f2 100644 --- a/atom.xml +++ b/atom.xml @@ -4,7 +4,7 @@ FLOW Lab - 2024-11-08T13:34:10-07:00 + 2024-11-08T15:29:03-07:00 http://flow.byu.edu Andrew Ning diff --git a/feed.xml b/feed.xml index ec1148a..5d87fab 100644 --- a/feed.xml +++ b/feed.xml @@ -1 +1 @@ -Jekyll2024-11-08T13:34:10-07:00http://flow.byu.edu/feed.xmlFLOW LabFlight, Optimization, and Wind LaboratoryAndrew NingOptimization Book Available2021-10-15T00:00:00-06:002021-10-15T00:00:00-06:00http://flow.byu.edu/posts/opt-book]]>Andrew NingBEM Paper2021-07-30T00:00:00-06:002021-07-30T00:00:00-06:00http://flow.byu.edu/posts/bem-paper]]>Andrew NingEduardo Research Update2021-03-01T00:00:00-07:002021-03-01T00:00:00-07:00http://flow.byu.edu/posts/eduardo-latest]]>Eduardo AlvarezReformulated VPM2021-02-01T00:00:00-07:002021-02-01T00:00:00-07:00http://flow.byu.edu/posts/reformulated-vpm]]>Eduardo AlvarezOptimization Book Announcement2021-01-20T00:00:00-07:002021-01-20T00:00:00-07:00http://flow.byu.edu/posts/optimization-book]]>Andrew NingPJ Defense2020-09-30T00:00:00-06:002020-09-30T00:00:00-06:00http://flow.byu.edu/posts/pj-defense]]>Andrew NingVPM Paper2020-08-30T00:00:00-06:002020-08-30T00:00:00-06:00http://flow.byu.edu/posts/vpm-paper]]>Eduardo AlvarezAirborne Wind with Vortex Particle Method2020-08-16T00:00:00-06:002020-08-16T00:00:00-06:00http://flow.byu.edu/posts/wind-harvesting]]>Judd Mehr and Eduardo AlvarezEduardo’s Past Three Years2020-08-10T00:00:00-06:002020-08-10T00:00:00-06:00http://flow.byu.edu/posts/eduardo-three-years]]>Eduardo AlvarezFLOWUnsteady in Google Drive2020-08-02T00:00:00-06:002020-08-02T00:00:00-06:00http://flow.byu.edu/posts/google-drive-vpm]]>Eduardo Alvarez \ No newline at end of file +Jekyll2024-11-08T15:29:03-07:00http://flow.byu.edu/feed.xmlFLOW LabFlight, Optimization, and Wind LaboratoryAndrew NingOptimization Book Available2021-10-15T00:00:00-06:002021-10-15T00:00:00-06:00http://flow.byu.edu/posts/opt-book]]>Andrew NingBEM Paper2021-07-30T00:00:00-06:002021-07-30T00:00:00-06:00http://flow.byu.edu/posts/bem-paper]]>Andrew NingEduardo Research Update2021-03-01T00:00:00-07:002021-03-01T00:00:00-07:00http://flow.byu.edu/posts/eduardo-latest]]>Eduardo AlvarezReformulated VPM2021-02-01T00:00:00-07:002021-02-01T00:00:00-07:00http://flow.byu.edu/posts/reformulated-vpm]]>Eduardo AlvarezOptimization Book Announcement2021-01-20T00:00:00-07:002021-01-20T00:00:00-07:00http://flow.byu.edu/posts/optimization-book]]>Andrew NingPJ Defense2020-09-30T00:00:00-06:002020-09-30T00:00:00-06:00http://flow.byu.edu/posts/pj-defense]]>Andrew NingVPM Paper2020-08-30T00:00:00-06:002020-08-30T00:00:00-06:00http://flow.byu.edu/posts/vpm-paper]]>Eduardo AlvarezAirborne Wind with Vortex Particle Method2020-08-16T00:00:00-06:002020-08-16T00:00:00-06:00http://flow.byu.edu/posts/wind-harvesting]]>Judd Mehr and Eduardo AlvarezEduardo’s Past Three Years2020-08-10T00:00:00-06:002020-08-10T00:00:00-06:00http://flow.byu.edu/posts/eduardo-three-years]]>Eduardo AlvarezFLOWUnsteady in Google Drive2020-08-02T00:00:00-06:002020-08-02T00:00:00-06:00http://flow.byu.edu/posts/google-drive-vpm]]>Eduardo Alvarez \ No newline at end of file diff --git a/me415/schedule/hw8/index.html b/me415/schedule/hw8/index.html index e9790cd..24fbd4d 100644 --- a/me415/schedule/hw8/index.html +++ b/me415/schedule/hw8/index.html @@ -149,11 +149,11 @@

HW 8

The parameter \(\Delta V_{ideal}\) is the velocity change from Tsiolkovsky’s rocket equation ignoring all losses (gravity, drag, steering, etc.). The listed specific impulse is just an average of sea level and vacuum (which we’ll assume is constant for the entire stage).

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The notional design for this stage is shown below:

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The notional design for this stage is shown below to the left:

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The fuel tanks and rocket body are made of aluminum. Note that a stacked configuration is used and that about 10 meters of extra length is required below the tanks for the engines. It is easiest to estimate the required tank size by assuming that the tanks are cylinders and then add on about 3 meters per tank to account for the fact that the round end caps will need to be longer than a pure cylinder and that there will be some ullage volume (that means the tanks won’t be 100% filled).

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The fuel tanks and rocket body are made of aluminum. Note that a stacked configuration is used and that about 10 meters of extra length is required below the tanks for the engines. As shown on the right, it is easiest to estimate the required tank size by assuming that the tanks are cylinders and then add on about 3 meters per tank to account for the fact that the round end caps will need to be longer than a pure cylinder and that there will be some ullage volume (that means the tanks won’t be 100% filled). For simplicity, I’d treat the diameter of the tanks as the same as that of the rocket body (it’s a really small difference).

Because the structural mass depends on the propellant mass, and the propellant mass depends on the structural mass, an iterative process is required (i.e., root finding). If you’re struggling to know if you’re on the right track, because this is an actual rocket, you could start with the known propellant mass and work your way through the equations checking your numbers against the actual rocket, then fine tune from there.

diff --git a/me415/schedule/tanks.png b/me415/schedule/tanks.png index 17fad83..373d83b 100644 Binary files a/me415/schedule/tanks.png and b/me415/schedule/tanks.png differ