1998 - Draper Laboratory

More documents

Recommendations

Info

InertialInstruments/MechanicalDesignNeil BarbourRotordynamic Modeling ofan Actively ControlledMagnetic Bearing GasTurbine EngineBernard M. AntkowiakFred C. NelsonYield Enhancement inMicromechanical SensorFabrication UsingStatistical Process ControlJeffrey T. BorensteinDouglas Preble
Draper’s primary goal is to Draper’s MEMS gyro is the most accurate MEMS gyro in theproduce fieldable prototypes world. MEMS sensors are built in our clean rooms, using theof complex systems. We are latest processing and measuring equipment, enabling us toproud of our involvement and build extremely high-aspect ratio, precisely tolerancedtechnical leadership in the geometrical structures. These extremely small, very ruggeddevelopment of these systems, such as instrumentation andstructures for munitions and earth-penetrating projectiles,unmanned undersea vehicles, autonomous land and airvehicles, small and microsatellite systems, compositestructures, vision systems, kinetic energy storage and control,active control of shock and vibration isolation, precisionautomated assembly systems, magnetic bearings, noninertialmicromechanical sensors, micromechanical and precisioninertial instruments, and measurement systems.Draper’s precision inertial instruments, which have been themainstay of the nation’s strategic deterrence missiles, arecomplex electromechanical systems offering high performanceacross a rugged environment. As with all engineeringactivities, new technologies have found a role in precisioninertial measurement. The Interferometric Fiber-OpticGyroscope (IFOG) is one of these technologies, and combinesdevices have enabled inertial sensing combined with GPS inextended-range guided munitions and guided 5-in artilleryshells.The ability to put guidance in low-cost munitions or incommercial applications depends on extremely low-costsensors. Yield from a silicon wafer must be high to get lowcost. Yield enhancement and a multipronged statisticalprocess control approach that was tailored to the particularrequirements of a small volume R&D micromachining processline is described in the paper by J. Borenstein and D. Preble.A highly automated process has been put in place to monitorkey processes, significantly improving yield.We use the very latest integrated design and analysis tools,which enhance productivity through integrated solid models,revision control, automated mesh generation, and product datamanagement. We have experience in all aspects of mechanicalthe field of mechanical design and electro-optics; many of the modeling and analysis, including: micromechanicaldevelopments are leveraged from the communicationsindustry. Our niche is in high-performance, radiationhardoptimization, system optimization, rotordynamics, vehiclekinematics, linear and nonlinear structural analysis, dynamics,IFOGs for strategic applications. Inertial thermal, hydrodynamics, aerodynamics, acoustics, magnetics,Instruments/Mechanical Design is the focal point for thedevelopment of a Draper-wide electro-optics capability thatwill ultimately lead to the creation of an electro-opticstechnology center.Inertial Instruments/Mechanical Design contains twoEngineering Technology Centers: the MicroelectromechanicalSystem (MEMS) Center and the Intelligent AutonomousUnmanned Vehicle (IAUV) Center, which are responsiblefor innovative technology development in their respectivefields and involve scientists throughout Draper. The IAUVCenter is home to the Vorticity Control UnmannedUndersea Vehicle (VCUUV) (an 8-ft autonomous vehiclethat swims like a fish) a family of land rovers, a 40-ftsubmarine built for DARPA, a helicopter, and the Drapermicrosatellite. The MEMS Center develops advancedMEMS sensors using batch fabrication techniques appliedin the semiconductor industry. These devices includemicromachined gyros, accelerometers, microphones,hydrophones, chemical sensors, and mirror arrays. TheMEMS Center is currently evaluating the technologiesrequired to create a Micro-Optic-ElectromechanicalSystem (MOEMS) center.biomimetics, gravimetrics, manufacturing, process modeling(including composites processing), and many more.A single-database methodology, where analysis is performedon geometry extracted directly from the CAD model, hasshown its effectiveness in our MEMS design activities. Froma single Pro/Engineer model, geometry is developed, finiteelementanalysis models are created, and mask data areproduced. One of the most important parameters for inertialMEMS devices, resonant frequency, has been shown to bepredictable to within 1-2%. This can be attributed to theconsistency of geometry, from design to analysis tomanufacture, that is inherent in the single-databasemethodology.The paper by B. Antkowiak and F. Nelson describes thedevelopment of a finite-element rotordynamic solution usedfor a closed-loop simulation of a magnetic-bearing rotorsystem for a gas turbine engine. By developing a reducedorderrotordynamic transfer function of the rotor, closed-loopdynamics of the engine’s rotary components can be simulated,enabling a significant advantage over traditional designapproaches by maintaining the coupling between actuators,thereby allowing design of centralized control systems.Introduction
Page 2 and 3:
Letter from thePresident and CEO,Vi
Page 4 and 5:
Information TechnologyMilton AdamsE
Page 6 and 7:
BiographyMilton Adams has been at D
Page 9 and 10:
Figure 1 represents a functional de
Page 11 and 12:
Programs. In effect, these controll
Page 13 and 14:
Although the terminal area traffic
Page 15 and 16:
Table 2. ATFM performance evaluatio
Page 17 and 18:
In the experiments, a nominal capac
Page 19 and 20:
[3] Wambsganss, Michael C. “Colla
Page 21 and 22:
Guidance, Navigation, and Control A
Page 23 and 24:
A Control Lyapunov FunctionApproach
Page 25 and 26:
x( 0) ∈ X and w(t) ∈Wfor all t
Page 27 and 28:
(b) Select a quadratic RCLF V i (x)
Page 29 and 30:
at each grid point. In the case w 1
Page 31 and 32:
References[1] Ball, J.A. and A.J. v
Page 33 and 34:
Page 35 and 36:
Relative and Differential GPSData T
Page 37 and 38:
The first term on the right in the
Page 39 and 40:
H R# δρ R,GPS -H A# δρ A,GPSThi
Page 41 and 42:
selection; and (3) shown that the a
Page 43 and 44: Guidance, Navigation, and Control A
Page 45 and 46: Segmentation of MR ImagesUsing Curv
Page 47 and 48: (3)where ν now represents a contin
Page 49 and 50: 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: [31] Neelon, Joseph G., Jr., Paul J
Page 97 and 98: )Rotordynamic Modelingof an Activel
Page 99 and 100: Eq. (9) becomes:λ[ R ] { Φ } = [
Page 101 and 102: chosen to be 24, for a total of 48
Page 103 and 104: InertialInstruments/MechanicalDesig
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-
Page 153 and 154:
Page 155 and 156:
An Optimal Guidance Law forPlanetar
Page 157 and 158:
Note that the states in the three d
Page 159 and 160:
Crossrange (Kft)10090807060504030Cl
Page 161 and 162:
The 1997 Charles StarkDraper PrizeT
Page 163 and 164:
The 1997 Charles StarkDraper Prize1
Page 165 and 166:
“Draper encourages its personnel
Page 167 and 168:
Gimballed Vibrating GyroscopeHaving
Page 169 and 170:
Page 171 and 172:
Optical Source Isolator withPolariz
Page 173 and 174:
Page 175 and 176:
Hunting Suppressor forPolyphase Ele
Page 177 and 178:
Page 179 and 180:
Sensor Having an Off-Frequency Driv
Page 181 and 182:
proof mass from transients and enha
Page 183 and 184:
1997 Published PapersThe following
Page 185 and 186:
monitoring of space structures and
Page 187 and 188:
measured by kinematic degrees of fr
Page 189 and 190:
i.e., what percent of the earth’s
Page 191 and 192:
McConley, M. W.; Dahleh, M. A.; Fer
Page 193 and 194:
unaffordable, or even misguided. Bu
Page 195 and 196:
The Draper DistinguishedPerformance
Page 197:
Educational Activitiesat Draper Lab
show all

1998 - Draper Laboratory

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?