MAE 161A 2009 - Lecture 6

# MAE 161A 2009 - Lecture 6 - News: Lecture 6 Homework Office...

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Slide 1 © Wirz MAE 161A Lecture 6 News: Homework HW #3 will be posted today Office Hours (upcoming) Tuesday (2-3) Wednesday (10-11:30) STK Certification Voucher Code is “EDUCERT09” Reading Assignment: BMW 4.1-4.2 (focus on 181-186) Chobotov 3.5, 4.1-4.2 (pages 35-41)

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Slide 2 © Wirz MAE 161A Last Lecture Orbit Transfers Impulsive Low Thrust Plane Change Keplerian Orbital Elements
Slide 3 © Wirz MAE 161A Hohmann Transfer “orbit raising”

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Slide 4 © Wirz MAE 161A What’s Wrong with this Picture?
Slide 5 © Wirz MAE 161A Impulsive V Requirements

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Slide 6 © Wirz MAE 161A Keplerian Orbital Elements (Note: all scalars) a , semi-major axis: size of orbit e , eccentricity: shape of the orbit , true anomaly at epoch angle of the satellite w.r.t. perigee i , inclination: the angle between the equatorial plane and the plane of the orbit , argument of periapsis angle of perigee w.r.t. the line of nodes , right ascension of the ascending node (RAAN) The angle between the X-axis and the line of nodes (where the satellite crosses through the equatorial plane in the northerly direction) Describe orbit (in- plane) Locate orbit plane
Slide 7 © Wirz MAE 161A Today’s Lecture V Rockets Thrust Impulse and Specific Impulse Simplified Rocket Equation

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Slide 8 © Wirz MAE 161A V (Delta-V) In astrodynamics we must change the velocity (apply a V) to: 1. Change the energy of the orbit Launch Descent/Landing Orbit Change Orbit Insertion Station Keeping (a.k.a. orbit maintenance) Drag compensation Interplanetary (Escape) 2. Other Attitude Control Disturbance reduction Formation Flying 2 22 v ra  11 Specific Mechanical Energy related to “a” 2 2 2 1 H e 10 Eccentricity (gives type of conic orbit) Launch Orbit Insertion
Slide 9 © Wirz MAE 161A V (Delta-V) V can be delivered by : Rockets Swing-by a.k.a. gravity assist Drag Other EM field solar wind collision etc.

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Slide 10 © Wirz MAE 161A Rockets Rockets carry their reaction mass (propellant) with them Two main ways to accelerate propellant: 1.
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## This note was uploaded on 10/17/2010 for the course MAE 161 taught by Professor Richard during the Spring '10 term at UCLA.

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MAE 161A 2009 - Lecture 6 - News: Lecture 6 Homework Office...

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