1998 - Draper Laboratory

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References[1] Nelson, H.D., “A Finite Rotating Shaft Element Using ReportERC Timoshenko Beam Theory,” Engineering ResearchCenter Report ERC-R-77023, Arizona State University,September 1977, p.61.[2] Nelson, H.D. and J.M. McVaughn, “The Dynamics of Rotor-Bearing Systems Using Finite Elements,” Trans. ASME,Journal of Engineering for Industry, May 1976, pp. 593-603.[3] Scholten, J.R., “A Magnetic Bearing System for HighTemperature Gas Turbine Applications,” published andpresented at IGTI, ASME, 1997.Free-Free Shaft100,000 lb/in (17.51x10 6 N/m) Bearing Stiffness-70,000 lb/in (-12.26x10 6 N/m) Starter-Generator StiffnessAmplitude 20log(x)0-100-20010 100 1000Frequency Hz(a)(d)0-rpm Rotor SpeedAmplitude 20log(x)0-100-20010 100 1000Frequency Hz00Amplitude 20log(x)-100-20010 100 1000Frequency HzAmplitude 20log(x)-100-20010 100 1000Frequency Hz(b)(e)13,400-rpm Rotor Speed00Amplitude 20log(x)-100-20010 100 1000Frequency Hz(c)Amplitude 20log(x)-10022,000-rpm Rotor Speed-20010 100 1000Frequency Hz(f)Figure 8. Bode plots of the rotor transfer function.Rotordynamic Modeling of an Actively Controlled Magnetic Bearing Gas Turbine Engine7
InertialInstruments/MechanicalDesignNeil BarbourRotordynamic Modeling ofan Actively ControlledMagnetic Bearing GasTurbine EngineBernard M. AntkowiakFred C. NelsonYield Enhancement inMicromechanical SensorFabrication UsingStatistical Process ControlJeffrey T. BorensteinDouglas Preble
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Letter from thePresident and CEO,Vi
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Information TechnologyMilton AdamsE
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BiographyMilton Adams has been at D
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Figure 1 represents a functional de
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Programs. In effect, these controll
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Although the terminal area traffic
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Table 2. ATFM performance evaluatio
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In the experiments, a nominal capac
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[3] Wambsganss, Michael C. “Colla
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Guidance, Navigation, and Control A
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A Control Lyapunov FunctionApproach
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x( 0) ∈ X and w(t) ∈Wfor all t
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(b) Select a quadratic RCLF V i (x)
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at each grid point. In the case w 1
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References[1] Ball, J.A. and A.J. v
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Relative and Differential GPSData T
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The first term on the right in the
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H R# δρ R,GPS -H A# δρ A,GPSThi
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selection; and (3) shown that the a
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Segmentation of MR ImagesUsing Curv
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(3)where ν now represents a contin
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Experimental ResultsThe results of
Page 51 and 52: Table 1. A summary of segmentation
Page 53 and 54: Guidance, Navigation,and ControlJim
Page 55 and 56: BiographyGeorge SchmidtGeorge Schmi
Page 57 and 58: clock and ephemeris errors, as well
Page 59 and 60: maintained in a rigid structure, wh
Page 61 and 62: Table 5. “Typical” absolute GPS
Page 63 and 64: performed, then the target location
Page 65 and 66: tightly-coupled system, however, ca
Page 67 and 68: Concluding RemarksRecent progress i
Page 69 and 70: As real-time systems evolve into th
Page 71 and 72: Advanced Fault-TolerantComputing fo
Page 73 and 74: The Viking and Voyager were both in
Page 75 and 76: Containment Regions (FCRs). There a
Page 77 and 78: well as reversing the whole process
Page 79 and 80: As real-time systems evolve into th
Page 81 and 82: Automated Station-Keepingfor Satell
Page 83 and 84: Figure 2. Minimum elevation angles
Page 85 and 86: anomaly M and/or the ascending node
Page 87 and 88: However, since optimization and rec
Page 89 and 90: is maintained in the Northern Hemis
Page 91 and 92: autonomy. It must have the ability
Page 93 and 94: [31] Neelon, Joseph G., Jr., Paul J
Page 95 and 96: Draper’s primary goal is to Drape
Page 97 and 98: )Rotordynamic Modelingof an Activel
Page 99 and 100: Eq. (9) becomes:λ[ R ] { Φ } = [
Page 101: chosen to be 24, for a total of 48
Page 105 and 106: BiographyJeffrey Borenstein is curr
Page 107 and 108: process step. Process information i
Page 109 and 110: Figure 4. Control chart for boron d
Page 111 and 112: References[1] Barbour, N., J. Conne
Page 113 and 114: Draper Laboratory continues to engi
Page 115 and 116: Validating the Validating Tool:Defi
Page 117 and 118: calculates miscellaneous terms, suc
Page 119 and 120: Table 1. Suggested specification sh
Page 121 and 122: User Accuracy as aFunction of Simul
Page 123 and 124: 20-min averaging, this clock lockin
Page 125 and 126: Table 2. Sample high-level summary
Page 127 and 128: AcknowledgmentR.L. Greenspan, J.A.
Page 129 and 130: Systems IntegrationRich MartoranaPe
Page 131 and 132: BiographyAnthony Kourepenis is an A
Page 133 and 134: control is employed to maintain the
Page 135 and 136: Table 1. Summary of automotive yaw
Page 137 and 138: Resolution (60 Hz) deg/h10000000100
Page 139 and 140: References[1] Greiff, P., B. Boxenh
Page 141 and 142: Guidance, Navigation, and Control A
Page 143 and 144: An Integrated Safety AnalysisMethod
Page 145 and 146: Infrastructure ModelsSystemRequirem
Page 147 and 148: Figures 6 and 7 illustrate the bloc
Page 149 and 150: Notice that each flight track descr
Page 151 and 152: Table 7. Safety statistics at 1700-
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An Optimal Guidance Law forPlanetar
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Note that the states in the three d
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Crossrange (Kft)10090807060504030Cl
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The 1997 Charles StarkDraper PrizeT
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The 1997 Charles StarkDraper Prize1
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“Draper encourages its personnel
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Gimballed Vibrating GyroscopeHaving
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Optical Source Isolator withPolariz
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Hunting Suppressor forPolyphase Ele
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Sensor Having an Off-Frequency Driv
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proof mass from transients and enha
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1997 Published PapersThe following
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monitoring of space structures and
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measured by kinematic degrees of fr
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i.e., what percent of the earth’s
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McConley, M. W.; Dahleh, M. A.; Fer
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unaffordable, or even misguided. Bu
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The Draper DistinguishedPerformance
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Educational Activitiesat Draper Lab
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1998 - Draper Laboratory

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