From 7a7d65603c323ff491684dcc117fc4b4fbf68669 Mon Sep 17 00:00:00 2001 From: Andrew Ning Date: Mon, 14 Oct 2024 14:04:28 -0600 Subject: [PATCH] next hw --- atom.xml | 2 +- feed.xml | 2 +- me415/schedule/hw6/index.html | 44 ++++++++++------------------------- me415/schedule/index.html | 2 +- 4 files changed, 15 insertions(+), 35 deletions(-) diff --git a/atom.xml b/atom.xml index 7e0956aa..cc0cad42 100644 --- a/atom.xml +++ b/atom.xml @@ -4,7 +4,7 @@ FLOW Lab - 2024-10-14T12:40:44-06:00 + 2024-10-14T14:04:23-06:00 http://flow.byu.edu Andrew Ning diff --git a/feed.xml b/feed.xml index 678c7d1d..1360ddec 100644 --- a/feed.xml +++ b/feed.xml @@ -1 +1 @@ -Jekyll2024-10-14T12:40:44-06:00http://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 +Jekyll2024-10-14T14:04:23-06:00http://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/hw6/index.html b/me415/schedule/hw6/index.html index 51ebfc60..53877d43 100644 --- a/me415/schedule/hw6/index.html +++ b/me415/schedule/hw6/index.html @@ -11,7 +11,7 @@ - HW 6 · ME 415 + HW · ME 415 @@ -87,44 +87,24 @@

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HW 6: Performance

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HW 6: Electric Propulsion

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due 11/1/2017 before midnight via Learning Suite -50 possible points

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due 10/23/2024 before midnight via Learning Suite +25 possible points

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Performance

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Predict some key performance metrics for your aircraft including:

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+

Consider a relatively large RC aircraft with the following components.

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  • speed for max range, and the corresponding range
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  • speed for max endurance, and the corresponding endurance
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  • speed for max climb rate, and the corresponding climb rate
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  • speed for max L/D, and the corresponding L/D (you’ve done this before, but your aircraft may have changed). - -
    • +
  • Battery: \(OCV =\) 22.2 V, Q = 5 Ah, R = 0.6 \(\Omega\). We’ll only assess efficiency at one state of charge so won’t need to worry about changes in open circuit voltage and resistance.
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  • Motor: \(K_v = 800\) RPM/V, \(R = 1.2\ \Omega\), and \(I_0 = 0.2\) A.
    • +
  • Propeller: APC Sport 10 x 8
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Discuss your results and what you think is the best metric for your application. Based on your decision report your design speed and design CL.

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Build/Fly

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Spend at least four hours this week working on building (and ideally some RC flying though it’s not required that you make it to the flying stage). Note: that is four hours each, not four hours collectively as a team.

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Report:

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  • How much time you personally spent working on building/flying.
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  • What you personally accomplished.
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  • An overview of what the team accomplished, lessons learned, and areas for future improvement.
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  • Photo(s) of the aircraft on the ground (and in flight if you get there).
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- - - - +

At a flight speed of \(V_\infty = 15\) m/s, plot the efficiency of the propeller, motor, battery, as well as total efficiency (four curves) as a function of propeller rotation speed from 400 rad/s to 600 rad/s.

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Hints: It’ll be easiest to work the power chain backwards from propeller, to motor, to battery. Using \(V_\infty\) and \(\Omega\) as inputs you have everything you need to compute all propeller properties by interpolating the propeller data. Some advance ratios may be outside the range of the provided data, and in those cases you can just use the values at the end point. You now know the torque (and rotation speed) on the motor and will be able to compute all the motor quantities. Finally, you now know the power coming into the motor, which must be the power supplied by the battery (note that voltage of battery and voltage of motor are in general not equal), and so can compute all corresponding battery quantities.

diff --git a/me415/schedule/index.html b/me415/schedule/index.html index 1653aa29..b5e96091 100644 --- a/me415/schedule/index.html +++ b/me415/schedule/index.html @@ -298,7 +298,7 @@

Schedule

W Oct 23 Climb/Glide 7.3-7.5 - HW 6 + HW 6 F Oct 25