MAE 161A 2009 - Lecture 7

MAE 161A 2009 - Lecture 7 - Lecture 7 News: HW #3 due now...

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Slide 1 © Wirz MAE 161A Lecture 7 News: HW #3 due now HW #4 available soon, due before midterm Midterm, currently Nov 5 th JPL guest lecturers on Nov 19, 20, 24 Reading Assignment: Bate, Mueller, White: 2.1-2.5, 2.9, 2.15 Chobotov, et al.: 2.1, 2.2, 3.6, 4.6-4.9, Ch 7 (focus on 135 144)
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Slide 2 © Wirz MAE 161A Last Lectures Lecture 6 Rockets and V Thrust, Impulse, and Specific Impulse Simplified Rocket Equation Chemical and Electric Propulsion TA Lecture Rendezvous, Orbit Phasing Synodic Period, Sidereal Period, Sidereal Day, Solar Day
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Slide 3 © Wirz MAE 161A Advantages and Disadvantages of Chemical and Electric Propulsion Chemical Propulsion Advantages High Thrust, launch and shorter trip times Mature design (relative to EP) No external power supply required Disadvantages Low Isp = High propellant mass requirement (energy limited) Poor precision High disturbance (high thrust) Electric Propulsion (EP) Advantages High Isp = Low propellant mass requirement Can provide greater V margin since it only costs a little bit of propellant for a lot more V High precision Low disturbance (low thrust) Disadvantages Low thrust, longer trip times (power limited) Higher inert mass: external power and power system required Less mature than chemical propulsion
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Slide 4 © Wirz MAE 161A Mass Definitions m o = (m pay + m i )+ m p (wet mass) m f = (m pay + m i ) (dry mass) m o = ( m f )+ m p m o initial mass m f final mass (delivered mass) m pay payload mass m p propellant mass m i mass of inert support material Structure support structure, fairings Electronics, main power Thruster system (minus propellant): engine, tank, propellant feed system, power, etc.
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MAE 161A 2009 - Lecture 7 - Lecture 7 News: HW #3 due now...

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