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199
May 29, 2011
05/11
by
Chao, Winston C.; Chen, Baod
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Chao's numerical and theoretical work on multiple quasi-equilibria of the intertropical convergence zone (ITCZ) and the origin of monsoon onset is extended to solve two additional puzzles. One is the highly nonlinear dependence on latitude of the ''force'' acting on the ITCZ due to earth's rotation, which makes the multiple quasi-equilibria of the ITCZ and monsoon onset possible. The other is the dramatic difference in such dependence when different cumulus parameterization schemes are used in...
Topics: JUPITER (PLANET), CALLISTO, GANYMEDE, EUROPA, RADIATION DOSAGE, ELLIPTICAL ORBITS, TRANSFER ORBITS
397
397
Jul 8, 2010
07/10
by
Schock, V. G.; Mellon, J. R
texts
eye 397
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No Abstract Available
Topics: INTERPLANETARY TRANSFER ORBITS, SWINGBY TECHNIQUE, GRAND TOURS, MISSION PLANNING, TRAJECTORY...
257
257
Jul 12, 2010
07/10
by
Stohrer, F. F.; Pinelli, T. E
texts
eye 257
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The present environment of the technical report is vast, with considerable variance in report components, format, and organization. As part of the Langley Scientific and Technical Information (STI) Review and Evaluation Project, a review of the technical report as an effective product for information communication was undertaken. Style manuals describing theory and practice in technical report preparation; publication manuals covering such factors as design, layout, and type style: and copies...
Topics: LAUNCHING, ORBITAL MECHANICS, TETHERLINES, TRANSFER ORBITS, NUMERICAL ANALYSIS, PAYLOADS, SPACE...
352
352
Jun 21, 2010
06/10
by
Mayo, J. W.; Michael, J. E
texts
eye 352
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Piezoelectric means for missile stage separation indication and stage initiation
Topics: EARTH-MOON TRAJECTORIES, LUNAR GRAVITATIONAL EFFECTS, ORBITAL VELOCITY, TRANSFER ORBITS, HYPERBOLIC...
188
188
Jul 12, 2010
07/10
by
Martersteck, K. E
texts
eye 188
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No Abstract Available
Topics: ASCENT TRAJECTORIES, LUNAR MODULE, RESCUE OPERATIONS, STRATEGY, TRANSFER ORBITS, COMMAND SERVICE...
203
203
Jul 11, 2010
07/10
by
Wetmore, J. W.; Zalovcik, J. A.; Platt, R. C
texts
eye 203
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comment 0
No Abstract Available
Topics: INJECTION GUIDANCE, LUNAR MODULE, TRANSFER ORBITS, EARTH-MOON TRAJECTORIES, PROBLEM SOLVING,...
540
540
Jul 23, 2010
07/10
by
Lichten, S. M.; Border, J. S
texts
eye 540
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High precision orbit determination of Global Positioning System (GPS) satellites is a key requirement for GPS-based precise geodetic measurements and precise low-earth orbiter tracking, currently under study at JPL. Different strategies for orbit determination have been explored at JPL with data from a 1985 GPS field experiment. The most successful strategy uses multi-day arcs for orbit determination and includes fine tuning of spacecraft solar pressure coefficients and station zenith...
Topics: AEROASSIST, AEROBRAKING, MANNED MARS MISSIONS, ORBIT TRANSFER VEHICLES, AEROCAPTURE, ATMOSPHERIC...
288
288
May 27, 2011
05/11
by
Colozza, Anthony J.; Scheiman, David A.; Brinker, David J
texts
eye 288
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Unmanned Aerial Vehicles (UAV) are being proposed for many applications for many applications including surveillance, mapping and atmospheric studies. These applications require a lightweight, low speed, medium to long duration aircraft. Due to the weight, speed, and altitude constraints imposed on such an aircraft, solar array generated electric power can be a viable alternative to air-breathing engines for certain missions. Development of such an aircraft is currently being funded under the...
Topics: CIRCULAR ORBITS, TRANSFER ORBITS, ATMOSPHERIC ENTRY, FLIGHT PATHS, ACCURACY, MISALIGNMENT, MISS...
188
188
Jul 11, 2010
07/10
by
ARISTOVSKAYA, T. V.; DARAGAN, A. Y.; ZYKINA, L. V.; KUTOZOVA, R. S
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THE BASIC MICROBIOLOGICAL PROCESSES CAUSING MOBILIZATION OF CHEMICAL ELEMENTS FROM POORLY SOLUBLE COMPOUNDS ARE DISCUSSED. IT IS CONCLUDED THAT THE MOST IMPORTANT ROLES ARE PLAYED BY: (1) THE FORMATION BY MICROORGANISMS OF MINERAL AND ORGANIC ACIDS AND PRODUCTS FORMING COMPLEX COMPOUNDS WITH MINERAL ELEMENTS; (2) THE RELEASE OF BIOGENETIC ALKALIS; (3) THE EFFECT OF SLIMES FORMED BY CERTAIN BACTERIA AND ALGAE; AND (4) THE LIFE PROCESSES OF MICROORGANISM REDUCING AGENTS.
Topics: ELLIPTICAL ORBITS, ORBIT CALCULATION, TRANSFER ORBITS, AXISYMMETRIC BODIES, IMPULSES, OPTIMIZATION,...
237
237
Jun 21, 2010
06/10
by
Ilinsky, A. I.; Palatnik, L. S.; Ravlik, A. G
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eye 237
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Tensile strength and microhardness of iron and nickel films prepared by vacuum condensation
Topics: EQUATIONS OF MOTION, ORBITAL MECHANICS, THRUST, TRANSFER ORBITS, COORDINATES, CORRECTION,...
The testbed role of an early manned space station in the context of a satellite servicing evolutionary development and flight demonstration technology plan which results in a satellite servicing operational capability is defined. A satellite servicing technology development mission (a set of missions) to be performed on an early manned space station is conceptually defined.
Topics: NASA Technical Reports Server (NTRS), PROJECT PLANNING, SPACE MAINTENANCE, SPACE STATIONS,...
272
272
Sep 20, 2010
09/10
by
Esker, Barbara S.; Mcardle, Jack G
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eye 272
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Aircraft with supersonic, short takeoff, and vertical landing capability were proposed to replace some of the current high-performance aircraft. Several of these configurations use a ventral nozzle in the lower fuselage, aft of the center of gravity, for lift or pitch control. Internal vanes canted at 20 deg were added to a swivel-type ventral nozzle and tested at tailpipe-to-ambient pressure ratios up to 5.0 on the Powered Lift Facility at NASA LeRC. The addition of sets of four and seven...
Topics: ERROR ANALYSIS, GEOSYNCHRONOUS ORBITS, LAUNCH WINDOWS, LUNAR ORBITS, SPACECRAFT LAUNCHING, TRANSFER...
695
695
May 31, 2011
05/11
by
NON
texts
eye 695
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The Year 2002 was another successful year for SHARP. Even after 22 years of SHARP, the Program continues to grow. There were 12 NASA Field Installations with a total of 210 apprentices who participated in the summer 2002 Program supported by 215 mentors in the fields of science and engineering. The apprentices were chosen from a pool of 1,379 applicants. This was a record year for applications exceeding the previous year by over 60%. For the second consecutive year, the number of female...
Topics: SPACE TRANSPORTATION SYSTEM, OBSERVATORIES, GEOSYNCHRONOUS ORBITS, EARTH SCIENCES, ARIANE LAUNCH...
The results of all aspects of the early space station satellite servicing study tasks are presented. These results include identification of servicing tasks (and locations), identification of servicing mission system and detailed objectives, functional/operational requirements analyses of multiple servicing scenarios, assessment of critical servicing technology capabilities and development of an evolutionary capability plan, design and validation of selected servicing technology development...
Topics: NASA Technical Reports Server (NTRS), PROJECT PLANNING, SPACE MAINTENANCE, SPACE STATIONS,...
273
273
May 30, 2011
05/11
by
Zak, J. Allen; Rodgers, William G., Jr
texts
eye 273
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The Aircraft Vortex Spacing System (AVOSS), a set of algorithms to determine aircraft spacing according to wake vortex behavior prediction, requires turbulence profiles to appropriately determine arrival and departure aircraft spacing. The ambient atmospheric turbulence profile must always be produced, even if the result is an arbitrary (canned) profile. The original turbulence profile code was generated By North Carolina State University and used in a non-real-time environment in the past. All...
Topics: DYNAMICAL SYSTEMS, HUBBLE SPACE TELESCOPE, TRAJECTORIES, LIBRATION, EQUATIONS OF STATE,...
327
327
Jul 11, 2010
07/10
by
KASYAN, I.; ASANOV, K
texts
eye 327
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STUDIES CONDUCTED DURING THE SOYUZ 13 FLIGHT DEALING WITH CEREBRAL BLOOD FLOW IN CREW MEMBERS F. POPOVICH AND YU. ARTYUKHIN ABOARD THE SALYUT 3 SPACE STATION ARE DESCRIBED. A LEVKOY TWO CHANNEL RHEOPLETHYSMOGRAPH WAS USED TO RECORD AND TRANSMIT RHEOGRAMS AND ELECTROPLETHYSMOGRAMS TO EARTH THROUGH THE SPACECRAFT'S TELEMETRIC SYSTEM.
Topics: IMPULSES, ORBIT CALCULATION, ORBITAL MECHANICS, TRANSFER ORBITS, EARTH ORBITS, KEPLER LAWS,...
560
560
Jul 11, 2010
07/10
by
VAILLE, C.; DEBRAY, C.; DELATOUR, J.; ROZE, C.; SOUCHARD, M
texts
eye 560
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A SERIES OF EXPERIMENTS ON RATS DEMONSTRATE THAT CAFFEINE ALONE HAS VERY LITTLE EFFECT ON BILE SECRETION, BUT THAT IT DOES PRODUCE A 100% INCREASE IN PANCREATIC FLOW, ALTHOUGH THE PROTEIN CONTENT OF THE PANCREATIC JUICE DOES NOT INCREASE PROPORTIONATELY. SEVERAL POSSIBLE EXPLANATIONS FOR THIS EFFECT ARE OFFERED, BUT IT IS NOT YET POSSIBLE TO DRAW ANY DEFINITE CONCLUSIONS.
Topics: ELLIPTICAL ORBITS, OPTIMIZATION, ORBIT CALCULATION, TRANSFER ORBITS, AXISYMMETRIC BODIES, IMPULSES,...
1,145
1.1K
Jul 11, 2010
07/10
by
NON
texts
eye 1,145
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The requirements of projected space programs (1985-1995) for transportation vehicles more advanced than the space shuttle are discussed. Several future program options are described and their transportation needs are analyzed. Alternative systems approaches to meeting these needs are presented.
Topics: GRAVITATIONAL EFFECTS, GRAVITATIONAL FIELDS, SPACE FLIGHT, SPACE MECHANICS, KEPLER LAWS, ORBITAL...
295
295
Jun 1, 2011
06/11
by
Zilberstein, Shlomo; Washington, Richard; Bernstein, Daniel S.; Mouaddib, Abdel-Illa
texts
eye 295
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Planetary rovers are small unmanned vehicles equipped with cameras and a variety of sensors used for scientific experiments. They must operate under tight constraints over such resources as operation time, power, storage capacity, and communication bandwidth. Moreover, the limited computational resources of the rover limit the complexity of on-line planning and scheduling. We describe two decision-theoretic approaches to maximize the productivity of planetary rovers: one based on adaptive...
Topics: FORMATION FLYING, VECTORS (MATHEMATICS), TRAJECTORY OPTIMIZATION, SPACECRAFT TRAJECTORIES, TRANSFER...
The overall NASA Combined Release and Radiation Effects Satellite (CRRES) program consists of a series of chemical releases from the PEGSAT spacecraft, the CRRES spacecraft and sounding rockets. The first chemical releases were made from the PEGSAT spacecraft in April, 1990 over northern Canada. In addition to the releases planned from the CRRES spacecraft there are releases from sounding rockets planned from the Kwajalein rocket range in July and August, 1990 and from Puerto Rico in June and...
Topics: NASA Technical Reports Server (NTRS), CRRES (SATELLITE), TRANSFER ORBITS, ATMOSPHERIC CHEMISTRY,...
227
227
Jun 26, 2010
06/10
by
Bahm, E
texts
eye 227
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Long life tape transport for magnetic recorder of outer planet spacecraft
Topics: BURNING RATE, LOW THRUST PROPULSION, SOLID PROPELLANT ROCKET ENGINES, TRANSFER ORBITS, HYDROXIDES,...
198
198
Jun 21, 2010
06/10
by
Berger, R. J.; Meier, G. W
texts
eye 198
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Eye movement characteristics of newborn monkeys deprived of patterned vision compared with normal control monkeys
Topics: ALGORITHMS, MAXIMUM PRINCIPLE, RANDOM PROCESSES, NONLINEAR EQUATIONS, OPTIMAL CONTROL, PONTRYAGIN...
191
191
Jun 27, 2010
06/10
by
Glassey, E. A
texts
eye 191
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Mechanical function generators with potentiometer as sensing element
Topics: COMPUTER PROGRAMS, LAGRANGE MULTIPLIERS, NEWTON-RAPHSON METHOD, POWER SERIES, TRAJECTORY...
206
206
Jul 26, 2010
07/10
by
Sandorff, Paul E
texts
eye 206
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No Abstract Available
Topics: CIRCUMLUNAR TRAJECTORIES, TRANSFER ORBITS, DESCENT TRAJECTORIES, LUNAR LANDING, RETROTHRUST, SOFT...
Titan/Centaur TC-3 was launched from the Eastern Test Range, Complex 41, at 02:34 PM EDT on Tuesday, September 9, 1975. This was the third operational flight of the newest NASA unmanned launch vehicle. The spacecraft was the Viking B, the second of two orbiting and landing missions to Mars planned for the 1975 Martian launch opportunity. The objective of the launch phase of the mission, to inject the Viking spacecraft onto the planned transfer orbit to Mars, was successfully accomplished. A...
Topics: NASA Technical Reports Server (NTRS), TITAN LAUNCH VEHICLES, VIKING ORBITER 1975, MARS (PLANET),...
Closed form expressions are derived for the position and velocity of a spacecraft during a finite burn using the method involving the theory of asymptotic expansion of the optimal impulsive solution. The small parameter is given by the reciprocal of the mass flow rate. The expansion is given in terms of the impulsive solution and holds up through third-order for the velocity and fourth-order for the position.
Topics: NASA Technical Reports Server (NTRS), TRAJECTORY OPTIMIZATION, TRANSFER ORBITS, COASTING FLIGHT,...
Numerical solutions to the optimal three-dimensional glide/thrust atmosphere skip maneuver are obtained using the multiple shooting iteration scheme. A singular thrust arc, induced by the heating constraints, is encountered. The synergetic plane change maneuver is shown to be superior to an extra-atmospheric one for 556-km (300-nm) circular orbit plane changes of more than 5 degrees.
Topics: NASA Technical Reports Server (NTRS), SPACE SHUTTLES, TRAJECTORY OPTIMIZATION, TRANSFER ORBITS,...
The launch schedule for Intelsat 5-B, the prime Intelsat satellite to provide communications services between the Americas, Europe, the Middle East, and Africa, is presented. The planned placement of the satellite into an elliptical transfer orbit, and circularization of the orbit at geosynchronous altitude over the equator are described. Characteristics of the Atlas Centaur launch vehicle, AC-56, are given. The launch operation is summarized and the launch sequence presented. The Intelsat team...
Topics: NASA Technical Reports Server (NTRS), ATLAS CENTAUR LAUNCH VEHICLE, INTELSAT SATELLITES, SPACECRAFT...
Quantitative analyses were developed to the point where numerical results can be easily obtained in the optimal transfer trajectory problem. Analyses of deployment dynamics and control of the paired satellite concept are progressing. Automatic control in space, optimal retrieval transfer trajectories, deployment attitude dynamics and control, and automatic control systems for retrieval are also considered.
Topics: NASA Technical Reports Server (NTRS), AUTOMATIC CONTROL, DEPLOYMENT, SPACECRAFT RECOVERY,...
399
399
May 31, 2011
05/11
by
NON
texts
eye 399
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This document presents the full-scale analyses of the CFD RSRM. The RSRM model was developed with a 20 second burn time. The following are presented as part of the full-scale analyses: (1) RSRM embedded inclusion analysis; (2) RSRM igniter nozzle design analysis; (3) Nozzle Joint 4 erosion anomaly; (4) RSRM full motor port slag accumulation analysis; (5) RSRM motor analysis of two-phase flow in the aft segment/submerged nozzle region; (6) Completion of 3-D Analysis of the hot air nozzle...
Topics: AUTOMATIC CONTROL, LINEAR QUADRATIC REGULATOR, AUTONOMY, FEEDBACK CONTROL, GRAVITATIONAL EFFECTS,...
A broad scoped and systematic study was made of space transfer concepts for human Lunar and Mars missions. Relevant space transportation studies were initiated to lead to further detailed activities in the following study period.
Topics: NASA Technical Reports Server (NTRS), LIFE CYCLE COSTS, TRAJECTORY OPTIMIZATION, TRANSFER ORBITS,...
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145
Jun 21, 2010
06/10
by
Fischbach, D. B
texts
eye 145
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Effect of substrate structure on deposition of evaporated carbon
Topics: ALGORITHMS, PROBLEM SOLVING, TRAJECTORY CONTROL, OPTIMAL CONTROL, TRANSFER ORBITS, APPLICATIONS OF...
Titan/Centaur TC-4 was launched from the Eastern Test Range, Complex 41, at 05:22 PM EDT on Wednesday, August 20, 1975. This was the second operational flight of the newest NASA unmanned launch vehicle. The spacecraft was the Viking A, the first of two orbiting and landing missions to Mars planned for the 1975 Martian launch opportunity. The objective of the launch phase of the mission, to inject the Viking spacecraft onto the planned transfer orbit to Mars, was successfully accomplished. This...
Topics: NASA Technical Reports Server (NTRS), TITAN LAUNCH VEHICLES, VIKING ORBITER 1975, MARS (PLANET),...
A study of the basic equations governing orbital transfers using long orbiting tethers is presented. A very simple approximation to the general transfer equation is derived for the case of short tethers and low eccentricity orbits. Numerical examples are calculated for the case of injection into a circular orbit from a platform in eccentric orbit and injection into eccentric orbit from a platform in circular orbit. For the case of long tethers, a method is derived for reducing tether mass and...
Topics: NASA Technical Reports Server (NTRS), LAUNCHING, ORBITAL MECHANICS, TETHERLINES, TRANSFER ORBITS,...
The ascent, rendezvous, docking and sample transfer operations in a potential MSSR mission that uses the Mars orbital rendezvous mode are considered. In order that the design choices made for these operations remain compatible with the rest of the mission, the impact on the Earth launch, Mars landing and orbiting and Earth return phase are also being assessed. The selection and description of a preliminary baseline concept are presented.
Topics: NASA Technical Reports Server (NTRS), FEASIBILITY ANALYSIS, MARS PROBES, ORBITAL RENDEZVOUS,...
305
305
Jul 26, 2010
07/10
by
Bioletti, Carlton; Cunningham, Bernard E
texts
eye 305
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No Abstract Available
Topics: INTERPLANETARY TRANSFER ORBITS, MARS PROBES, PARAMETER IDENTIFICATION, ROUND TRIP TRAJECTORIES,...
434
434
Jul 26, 2010
07/10
by
Yates, E. Carson, Jr
texts
eye 434
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Progress in the development of computational methods for steady and unsteady aerodynamics has perennially paced advancements in aeroelastic analysis and design capabilities. Since these capabilities are of growing importance in the analysis and design of high-performance aircraft, considerable effort has been directed toward the development of appropriate aerodynamic methodology. The contributions to those efforts from the integral-equations research program at the NASA Langley Research Center...
Topics: AEROBRAKING, SHOCK LAYERS, STAGNATION POINT, TRANSFER ORBITS, ATMOSPHERIC ENTRY, BLUNT BODIES,...
Viewgraphs and discussion on space station fluid management logistics are presented. Topics covered include: fluid management logistics - issues for Space Station Freedom evolution; current fluid logistics approach; evolution of Space Station Freedom fluid resupply; launch vehicle evolution; ELV logistics system approach; logistics carrier configuration; expendable fluid/propellant carrier description; fluid carrier design concept; logistics carrier orbital operations; carrier operations at...
Topics: NASA Technical Reports Server (NTRS), FLUID MANAGEMENT, SPACE LOGISTICS, SPACE STATION FREEDOM,...
The objectives of this slide presentation are to (1) Describe the general characteristics of the Earth Parking Orbit (EPO) and Translunar Injection (TLI) (2) List the general activities that occurred during EPO (4) State what went into verifying a working Saturn IVB S-IVB IU and a CSM GNC (5) Differentiate between a Free-Return Trajectory vs. a Hybrid Non-Free-Return Trajectory (6) Identify the crew monitoring task during the TLI Burn and (7) Identify the abort modes in the event of severe...
Topics: NASA Technical Reports Server (NTRS), EARTH ORBITS, PARKING ORBITS, TRANSLUNAR INJECTION, LUNAR...
The third satellite of the international Sun-Earth Explorer program was inserted into a periodic halo orbit about L sub 1, the collinear libration point between the Sun and the Earth-Moon barycenter. A plan is presented that was developed to enable insertion into the halo orbit in case there was a large underperformance of the Delta second or third stage during the maneuver to insert the spacecraft into the transfer trajectory. After one orbit of the Earth, a maneuver would be performed near...
Topics: NASA Technical Reports Server (NTRS), INTERNATIONAL SUN EARTH EXPLORER 3, ORBITAL MECHANICS, DELTA...
332
332
Jul 26, 2010
07/10
by
Kumar, Shiv S
texts
eye 332
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No Abstract Available
Topics: AEROBRAKING, RESOURCE ALLOCATION, TECHNOLOGY UTILIZATION, FINANCIAL MANAGEMENT, INTERPLANETARY...
The classical problem of tangential impulse transfer between coplanar Keplerian orbits is addressed. A completely analytic solution which does not rely on sequential calculation is obtained and this solution is used to demonstrate that certain initially chosen angles can produce singularities in the parameters of the transfer orbit. A necessary and sufficient condition for such singularities is that the initial and final orbits intersect.
Topics: NASA Technical Reports Server (NTRS), KEPLER LAWS, PLANAR STRUCTURES, TRANSFER ORBITS, TWO BODY...
Tether safety issues are summarized.
Topics: NASA Technical Reports Server (NTRS), PAYLOAD TRANSFER, SAFETY FACTORS, TETHERED SATELLITES,...
This paper is a presentation of some practical aspects of orbital transfer from Geosynchronous Transfer Orbit (GTO) to close, near-circular orbits of the Moon. The intent is to identify the important parameters affecting the problem and to bound (approximately) the range of required delta V for a spacecraft that has been placed in GTO. The basic geometric relationships are described and the dynamics are simulated by use of the Zero-Sphere-of Influence Patched Conic method. It is found that the...
Topics: NASA Technical Reports Server (NTRS), ERROR ANALYSIS, GEOSYNCHRONOUS ORBITS, LAUNCH WINDOWS, LUNAR...
An aerobrake design that has matured over several years of development accounting for all of the important flow phenomenology which are characteristic of aerobraking vehicles is proposed as the mission baseline. Flight regimes and aerothermal environments for both Mars and Earth entry are calculated using advanced methods to account for real-gas, thermochemical, relaxation effects. The results are correlated with thermal-protection and structural requirements and mission performance capability....
Topics: NASA Technical Reports Server (NTRS), AEROASSIST, AEROBRAKING, MANNED MARS MISSIONS, ORBIT TRANSFER...
The Aeroassist Flight Experiment (AFE) will be the first vehicle to simulate a return from geosynchronous orbit, deplete energy during an aerobraking maneuver, and navigate back out of the atmosphere to a low earth orbit It will gather scientific data necessary for future Aeroasisted Orbitl Transfer Vehicles (AOTV's). Critical to mission success is the ability of the atmospheric guidance to accurately attain a targeted post-aeropass orbital apogee while nulling inclination errors and...
Topics: NASA Technical Reports Server (NTRS), AEROASSIST, ORBIT CALCULATION, SPACECRAFT TRAJECTORIES,...
Delta vehicle performance increases associated with 14 major configuration changes are outlined in terms of spacecraft weight into synchronous transfer orbit. Also discussed is the per-mission cost history, except range cost and amortization of development.
Topics: NASA Technical Reports Server (NTRS), COST EFFECTIVENESS, DELTA LAUNCH VEHICLE, LAUNCH VEHICLE...
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276
May 23, 2011
05/11
by
Ungewitter, Ronald J.; Beck, James; Ketchum, Andre
texts
eye 276
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The effective performance of modular thrusters in an aerospike configuration is difficult to determine. Standard analytical tools are applicable to conventional nozzle shapes, but are limited when applied to an aerospike nozzle (An aerospike nozzle is an altitude compensating external nozzle). Three baseline nozzle shapes are derived using standard analytical procedures. The baseline nozzle sizes are restricted to fill a volume envelope. The three shapes are an axi-symmetric round nozzle, a two...
Topics: TRANSFER ORBITS, PERTURBATION, FUEL CONSUMPTION, BOUNDARY VALUE PROBLEMS, EQUATIONS OF MOTION,...
The compability of the nominal rendezvous sequence with low target orbits is addressed. It was found that for targets in low earth orbits certain modifications of the nominal sequence are required to achieve a feasible anytime liftoff capability, notably the use of elliptical phasing orbits and the allowance of up to two days for rendezvous under certain phasing conditions.
Topics: NASA Technical Reports Server (NTRS), CIRCULAR ORBITS, ORBITAL MECHANICS, LOW EARTH ORBITS, ORBITAL...
The firing of a fixed impulse spin stabilized upper stage following shuttle deployment of a geosynchronous payload was examined in detail. Design of the transfer trajectory was discussed in terms of finding both a nominal and possible dispersion case that can be handled operationally within the allotted trim fuel budget.
Topics: NASA Technical Reports Server (NTRS), PAYLOADS, SPACE SHUTTLES, TRAJECTORIES, TRANSFER ORBITS,...
