246
246

Jun 18, 2010
06/10

by
Smolinikov, B. A

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Motion of rigid body under rotational effect of internal flywheel

Topics: FLYWHEELS, RIGID STRUCTURES, ROTATION, FLYWHEEL, RIGID BODY, ROTATION

597
597

May 27, 2011
05/11

by
Bland, William M., Jr.; Collie, Katherine A

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Aerodynamic-heating data have been obtained on a modified fineness-ratio-5.0 Von Karman nose shape at free-stream Mach numbers up to 10.4 with a rocket-propelled model. Transient skin temperatures were measured at one station, 26.6 inches behind the tip of a nose 31.6 inches long. A maximum skin temperature of 1,663 deg R was measured soon after the maximum Mach number was obtained. During the periods for which experimental Stanton numbers were presented, flow parameters just outside the...

Topics: RIGID STRUCTURES, THIN WALLED SHELLS, APPROXIMATION, THEORIES, FRICTION, CIRCULAR CYLINDERS

829
829

Jun 17, 2010
06/10

by
Zeleznik, F. J

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No Abstract Available

Topics: BODY KINEMATICS, EUCLIDEAN GEOMETRY, RIEMANN MANIFOLD, RIGID STRUCTURES, TENSOR ANALYSIS

237
237

Jul 26, 2010
07/10

by
Allison, S. G.; Heyman, J. S.; Smith, K.; Salama, K

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No Abstract Available

Topics: KINEMATICS, MANIPULATORS, MATHEMATICAL MODELS, RIGID STRUCTURES, ROBOT DYNAMICS, CONTACT LOADS,...

463
463

Jul 11, 2010
07/10

by
Lock, M. H.; Rubin, S

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A qualitative assessment of the tendency for pogo instability of the shuttle vehicle in the absence of suppression devices, and the effectiveness of two passive suppressors (the compliant accumulator and the resistive accumulator) in counteracting any tendency toward instability is provided. In addition, the relative effectiveness of three suppressor locations (the low pressure pump (LWOP) inlet and discharge and the high pressure pump (HPOP) inlet) is also evaluated. The primary conclusion of...

Topics: QUATERNIONS, RIGID STRUCTURES, ROTATION, AIRCRAFT CONTROL, APPLICATIONS OF MATHEMATICS, KINEMATIC...

550
550

Jun 21, 2010
06/10

by
NON

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Environmental research satellite test design with transponder for range measurements at ground station

Topics: FEEDBACK CONTROL, FLIGHT CONTROL, SATURN LAUNCH VEHICLES, BENDING, EQUATIONS OF MOTION, GYROSCOPES,...

566
566

Jun 27, 2010
06/10

by
Garcia, D

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Reusable nuclear shuttle configuration, mass characteristics, stage and INT-21 interfaces, and design criteria and constraints

Topics: FOAMS, RIGID STRUCTURES, SOLAR COLLECTORS, STORAGE STABILITY, THERMAL ENERGY, CATALYSTS, CHEMICAL...

140
140

Jun 27, 2010
06/10

by
Kurtz, D. W

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Aerodynamic characteristics of vehicle models in aluminum tube

Topics: IMPACT, INCOMPRESSIBLE FLUIDS, SPHERICAL SHELLS, HYDROELASTICITY, IMPACT LOADS, INERTIA, NUMERICAL...

211
211

Jun 21, 2010
06/10

by
Spearman, M. L

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Development and characteristics of translating horizontal tail assembly for supersonic aircraft

Topics: FUEL TANKS, LIQUID SLOSHING, MICROGRAVITY, RIGID STRUCTURES, INCOMPRESSIBLE FLOW, INTERFACIAL...

In a recent paper by Zinoviev and Bies in this Journal, the authors have claimed that the well-known theoretical results of Curle and Ffowcs Williams and Hawkings (FW-H) are incorrect. This claim is categorically refuted below and serious errors are pointed out.

Topics: NASA Technical Reports Server (NTRS), AEROACOUSTICS, RIGID STRUCTURES, FLUID FLOW, PLANE WAVES,...

258
258

Jun 27, 2010
06/10

by
Rossow, V. J.; Clements, H. G.; Denardo, B. P

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Development and characteristics of device for deployment of long wires as method of reducing hazards due to lightning during spacecraft launches

Topics: AERODYNAMIC LOADS, SPACE SHUTTLES, SPACECRAFT CONTROL, LOAD DISTRIBUTION (FORCES), POTENTIAL...

347
347

Jul 6, 2010
07/10

by
Pianko, M

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The optimum paths providing for minimization of the noise level of an aircraft during take-off are studied. Determination of those paths emphasizes the aircraft parameter which, apart from engine noise, establish the noise intensity at take-off. The relative effect of each parameter is evaluated. The influence of engine technology, its restrictions and limitations on future progress in the field of take-off noise is examined. The extent to which the results may be altered by the introduction of...

Topics: RADIATION PRESSURE, RIGID STRUCTURES, SATELLITE ATTITUDE CONTROL, SOLAR RADIATION, EQUATIONS OF...

Plasteel Products Corporation approached the Industrial Applications Center at the University of Pittsburgh to search for ideas on "rigidized" metal sheeting. Thinner-gage metal with strength of heavier sheeting can be obtained through cold bending, stamping, dimpling, or embossing - referred to as "rigidizing." Pittsburgh came up with 36 reports relevant to Plasteel's needs. On the basis of this search the company purchased an embossing machine with which it hopes to...

Topics: NASA Technical Reports Server (NTRS), METAL SHEETS, PANELS, RIGID STRUCTURES, MACHINING, SOLVENTS,...

408
408

May 27, 2011
05/11

by
English, Robert E.; Slone, Henry O.; Bernatowicz, Daniel T.; Davison, Elmer H.; Lieblein, Seymou

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A conceptual design of a nuclear turboelectric powerplant, producing 20,000 kilowatts of power suitable for manned space vehicles is presented. The study indicates that the radiator necessary for rejecting cycle waste heat is the dominant weight, and emphasis is placed on the selection of cycle operating conditions in order to reduce this weight. A thermodynamic cycle using sodium vapor as the working fluid and operating at a turbine-inlet temperature of 2500 R was selected. The total...

Topics: MOMENTS OF INERTIA, RIGID STRUCTURES, CIRCULAR CYLINDERS, SIMPLE HARMONIC MOTION, CAVITIES, CENTER...

386
386

Jul 11, 2010
07/10

by
Ahrons, R. W

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An increase in efficiency from 2% to over 7% was achieved by a solar cell that used polycrystal silicon heterojunction with SnO2 glass. For Single crystal substrates, efficiencies close to 10% were measured. These cells had the same structures as polycrystalline cells. Work on p/n heterojunction using In2O3 glass resulted in cells of 3% efficiency on polycrystalline material and 4% efficiency on single crystal material.

Topics: COMPUTERIZED SIMULATION, DYNAMIC STRUCTURAL ANALYSIS, PROBLEM SOLVING, RIGID STRUCTURES,...

The analysis of the efficiency of algorithms resulting from Kane's Equation for serial and parallel computation of mass matrix is examined. The algorithms resulting from Kane's equation and Modified Kane's equations are detailed. An analysis was made of two classes of algorithms for computation of mass matrix: the Newton-Euler based algorithms and the Composite rigid body algorithms. An analysis was also made of the efficiency of different algorithms for serial and parallel computations....

Topics: NASA Technical Reports Server (NTRS), ALGORITHMS, CONTROL SYSTEMS DESIGN, EQUATIONS OF MOTION,...

For special space applications, e.g. for experiments distant from any orbital platforms or manipulators a new kind of jibs with extreme extension capacity has to be designed. Considering the requirements, the telescopic principle is found to be the most promising. For the choice of the stiff structure, design criteria are evaluated. Special effort deals with the drive system. An electromechanical system can satisfy the requirements. First results of the development of such a drive are...

Topics: NASA Technical Reports Server (NTRS), ELECTROMECHANICAL DEVICES, EXTENSIONS, ORBITAL WORKSHOPS,...

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Jul 11, 2010
07/10

by
Riddle, G. R.; Naumcheff, M

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No Abstract Available

Topics: RIGID STRUCTURES, SATURN 1 SA-5 LAUNCH VEHICLE, SPACECRAFT TRAJECTORIES, DYNAMIC PRESSURE,...

A capability to simulate trajectories Of Multiple interacting rigid bodies has been developed. This capability uses the Program to Optimize Simulated Trajectories II (POST II). Previously, POST II had the ability to simulate multiple bodies without interacting forces. The current implementation is used for the Simulation of parachute trajectories, in which the parachute and suspended bodies can be treated as rigid bodies. An arbitrary set of connecting lines can be included in the model and are...

Topics: NASA Technical Reports Server (NTRS), TRAJECTORIES, SIMULATION, INTERACTIONAL AERODYNAMICS, RIGID...

465
465

Jun 21, 2010
06/10

by
Mc Carthy, D. K

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Mechanical and electrical functions of thermal lightweight oscillating actuator for satellite systems

Topics: BOOMS (EQUIPMENT), RIGID STRUCTURES, SPACE ERECTABLE STRUCTURES, STRUCTURAL DESIGN, BERYLLIUM...

This report describes progress made during the period July 1991 to December 1991 on the tasks identified in the technical proposals for the subject grant. The plans for further effort on each of the tasks are outlined. The computer implementation of the method of analysis under development is referred to in this document as NLPAN. These tasks included: (1) implementation of continuation methods; (2) dynamic analysis capability; (3) additional boundary condition options for the panel ends; (4)...

Topics: NASA Technical Reports Server (NTRS), COMPRESSION LOADS, NONLINEARITY, RIGID STRUCTURES, STIFFNESS...

A capability to simulate trajectories of multiple interacting rigid bodies has been developed, tested and validated. This capability uses the Program to Optimize Simulated Trajectories II (POST 2). The standard version of POST 2 allows trajectory simulation of multiple bodies without force interaction. In the current implementation, the force interaction between the parachute and the suspended bodies has been modeled using flexible lines, allowing accurate trajectory simulation of the...

Topics: NASA Technical Reports Server (NTRS), TRAJECTORIES, PARACHUTES, MOTIVATION, SIMULATION, RIGID...

A methodology for producing simulations of the docking of a rigid spacecraft with any unrestrained flexible structure was studied. A detailed algorithm for the simulation of the docking of a rigid body with a nonuniform unrestrained beam was sought. The values acquired during docking by the variables characterizing the motions of the rigid body and the unrestrained beam were sought.

Topics: NASA Technical Reports Server (NTRS), CANTILEVER BEAMS, FLEXIBILITY, SIMULATION, SPACECRAFT...

A somewhat general multibody model is presented that accounts for energy dissipation associated with fuel slosh and which unifies some of the existing more specialized representations. This model is used to predict the mutation growth time constant for the Triana Spacecraft, or Stack, consisting of the Triana Observatory mated with the Gyroscopic Upper Stage of GUS (includes the solid rocket motor, SRM, booster). At the nominal spin rate of 60 rpm and with 145 kg of hydrazine propellant on...

Topics: NASA Technical Reports Server (NTRS), LIQUID SLOSHING, RIGID STRUCTURES, DYNAMIC MODELS, WAVE...

315
315

Jun 17, 2010
06/10

by
Howard, J. C

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Mathematical model to compute rigid body motion independently of flexible body motion in launch vehicles

Topics: COMPUTATION, MATHEMATICAL MODEL, RIGID BODY, FLEXIBLE BODIES, FREQUENCIES, LAUNCH VEHICLES,...

280
280

Jun 27, 2010
06/10

by
Gamo, H

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Intensity distribution of optical images for various degrees of illumination using Hermitian matrices

Topics: FLIGHT MECHANICS, KINEMATICS, RIGID STRUCTURES, ROTATING BODIES, ANGULAR ACCELERATION, ANGULAR...

The results are presented of a program to improve the reusable surface insulation (RSI) system through the improvement of the LI-1500 material properties and the simplification of the RSI system. The improvements made include: 2500 F-capability RSI systems, water-impervious surface coatings, establishment of a high-emittance coating constituent, development of a secondary water-reduction system, and achievement of a lower density (9 pcf) RSI material.

Topics: NASA Technical Reports Server (NTRS), SPACE SHUTTLES, SPACECRAFT CONSTRUCTION MATERIALS, THERMAL...

A concise method has been formulated for identifying a set of forces needed to constrain the behavior of a mechanical system, modeled as a set of particles and rigid bodies, when it is subject to motion constraints described by nonholonomic equations that are inherently nonlinear in velocity. An expression in vector form is obtained for each force; a direction is determined, together with the point of application. This result is a consequence of expressing constraint equations in terms of dot...

Topics: NASA Technical Reports Server (NTRS), NONLINEAR EQUATIONS, NONHOLONOMIC EQUATIONS, MOTION, RIGID...

360
360

Jul 11, 2010
07/10

by
Holmes, R. F.; King, C. D.; Keller, E. E

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Refinements in the design of a Bosch CO2 reduction unit for spacecraft O2 production are described. Sealing of the vacuum insulation jacket was simplified so that high vacuum and high insulation performance are easily maintained. The device includes a relatively simple concentric shell recuperative heat exchanger which operates at approximately 95% temperature effectiveness and helps lower power consumption. The influence of reactor temperature, pressure, and recycle gas composition on power...

Topics: BODIES OF REVOLUTION, ELASTIC PROPERTIES, NUMERICAL ANALYSIS, RIGID STRUCTURES, USER MANUALS...

413
413

May 31, 2011
05/11

by
Yu, Jirong; Braud, Alain; Petros, Mulugeta; Singh, Upendra N

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A high energy double-pulsed Ho:Tm:YLF 2-micrometer laser amplifier has been demonstrated. 600 mJ per pulse pair under Q-switch operation is achieved with the gain of 4.4. This solid-state laser source can be used as lidar transmitter for multiple lidar applications such as coherent wind and carbon dioxide measurements.

Topics: ATMOSPHERIC ENTRY, BRAKES (FOR ARRESTING MOTION), DATA PROCESSING, FLIGHT SIMULATION, PARACHUTES,...

The problem of applying modular attitude control to a rigid body-flexible suspension model of a flexible spacecraft with some state variables inaccessible was addressed by developing a sequence of single axis models and generating a series of reduced state linear observers of minimum order to reconstruct those scalar state variables that were inaccessible. The specific single axis models treated consisted of two, three and four rigid bodies, respectively, interconnected by a flexible shaft...

Topics: NASA Technical Reports Server (NTRS), COMPUTATIONAL FLUID DYNAMICS, FLEXIBLE SPACECRAFT, SATELLITE...

A titanium-alloy mirror-holding fixture called a strong back allows the temporary and permanent bonding of a 50 degree D263 glass x-ray mirror (IXO here stands for International X-ray Observatory). The strong back is used to hold and position a mirror segment so that mounting tabs may be bonded to the mirror with ultra-low distortion of the optical surface. Ti-15%Mo alloy was the material of choice for the strong back and tabs because the coefficient of thermal expansion closely matches that of...

Topics: NASA Technical Reports Server (NTRS), RIGID STRUCTURES, TITANIUM ALLOYS, SEGMENTED MIRRORS,...

Spatial displays, and a constraint that they do not place on the use of spatial instruments are discussed. Much of the work done in visual perception by psychologists and by computer scientists has concerned displays that show the motion of rigid objects. Typically, if one assumes that objects are rigid, one can then proceed to understand how the constant shape of the object can be perceived (or computed) as it moves through space. The author maintains that photographs and cinema are visual...

Topics: NASA Technical Reports Server (NTRS), CINEMATOGRAPHY, MOTION PERCEPTION, SPATIAL RESOLUTION, VISUAL...

This procedure is distinguished by two beating wings which together describe, in space, a succession of interlaced triangles. On these wings, whose incidence varies automatically, identical forces are exerted: simultaneous lift and thrust when they make their descent, which is inclined toward the front of the craft, and lift alone when they make their ascent, which is inclined toward the rear of the craft and follows a slide horizontal movement. A mechanical device makes these movements...

Topics: NASA Technical Reports Server (NTRS), LIFT DEVICES, RESEARCH AIRCRAFT, THRUST CONTROL, WING...

Some robot tasks require manipulation of objects that may be touching other fixed objects. The effects of friction and kinematic constraint must be anticipated, and may even be exploited to accomplish the task. An example task, a dynamic analysis, and appropriate effector motions are presented. The goal is to move a rectangular block along a wall, so that one side of the block maintains contact with the wall. Two solutions that push the block along the wall are discussed.

Topics: NASA Technical Reports Server (NTRS), KINEMATICS, MANIPULATORS, MATHEMATICAL MODELS, RIGID...

The effect of post-Newtonian potentials on the rotation of a nearly rigid body is shown to consist of a precession and a torque. The frequency of the precession can be exactly represented by means of suitable differential operators. The relativistic torques in the quadrupole approximation depend on the instantaneous orientation of the principal axes of one body with respect to the position like the classical torque and velocity of the other. For a relatively low mass body, such as a gyroscope,...

Topics: NASA Technical Reports Server (NTRS), GRAVITATIONAL FIELDS, PRECESSION, RELATIVISTIC EFFECTS, RIGID...

A belt for transmitting power from a cogged driving member to a cogged driven member such as a pair of wheel sprockets is described. The belt has inflexible teeth spaced along the direction of its travel. Each of the teeth has a longitudinal axis transverse to the direction of belt travel. The belt also includes substantially inextensible fasts spaced transversely to the direction of belt travel. The fasts extend in the direction of belt travel adjacent to the teeth and are looped around...

Topics: NASA Technical Reports Server (NTRS), CABLES (ROPES), DURABILITY, GEAR TEETH, MECHANICAL DRIVES,...

A collapsible dish structure composed of a plurality of rows of rigid radial petal assemblies concentric with the axis of the dish. The petal assemblies consist of a center petal and two side petals, the center petal hinged on an axis tangent to a circle concentric with the axis of the dish and the side petals hinged to the center petal at their mating edge. The center petal is foldable inwardly and the side petals rotate about their hinges such that the collapsed dish structure occupies a much...

Topics: NASA Technical Reports Server (NTRS), COLLAPSE, EXPANDABLE STRUCTURES, PARABOLIC REFLECTORS, RIGID...

Modular, lightweight, fully equipped buildings comprising hybrids of rigid and inflatable structures can be assembled on Earth and then transported to and deployed on the Moon for use as habitats. Modified versions of these buildings could also prove useful on Earth as shelters that can be rapidly and easily erected in emergency situations and/or extreme environments: examples include shelters for hurricane relief and for Antarctic exploration.

Topics: NASA Technical Reports Server (NTRS), INFLATABLE STRUCTURES, MODULES, RIGID STRUCTURES, SHELTERS,...

The plane elasticity problem for an orthotropic strip containing a crack parallel to its boundaries is considered. The problem is formulated under general mixed mode loading conditions. The stress intensity factors depend on two dimensionless orthotropic constants only. For the crack problem the results are given for a single crack and two collinear cracks. The calculated results show that of the two orthotropic constants the influence of the stiffness ratio on the stress intensity factors is...

Topics: NASA Technical Reports Server (NTRS), CRACK PROPAGATION, ORTHOTROPISM, WEDGES, COLLINEARITY, RIGID...

No abstract available

Topics: NASA Technical Reports Server (NTRS), ACTIVE CONTROL, X RAY ASTRONOMY, MIRRORS, RIGID STRUCTURES,...

In the analysis of vibrations of continuous elastic systems, one often encounters complicated transcendental equations with roots directly related to the system's natural frequencies. Typically, these equations contain system parameters whose values must be specified before a numerical solution can be obtained. The present paper presents a method whereby the fundamental frequency can be obtained in analytical form to any desired degree of accuracy. The method is based upon truncation of rapidly...

Topics: NASA Technical Reports Server (NTRS), ALGEBRA, DISTRIBUTED PARAMETER SYSTEMS, RESONANT FREQUENCIES,...

A new method of design decomposition for structural analysis and optimization is described. For this method, the structure is divided into substructures where each substructure has its structural response described by a structural-response subproblem, and its structural sizing determined from a structural-sizing subproblem. The structural responses of substructures that have rigid body modes when separated from the remainder of the structure are further decomposed into displacements that have...

Topics: NASA Technical Reports Server (NTRS), NONLINEAR PROGRAMMING, OPTIMIZATION, RIGID STRUCTURES,...

113
113

Jun 13, 2011
06/11

by
Golden, Keith; Nemani, Ramakrishna; Pang, Wanlin; Votava, Pet

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The latest generation of NASA Earth Observing System (EOS) satellites has brought a new dimension to continuous monitoring of the living part of the Earth System, the biosphere. EOS data can now provide weekly global measures of vegetation productivity and ocean chlorophyll, and many related biophysical factors such as land cover changes or snowmelt rates. However, the highest economic value would come from forecasting impending conditions of the biosphere, to allow decision makers to mitigate...

Topics: STRUCTURAL DESIGN, BENDING MOMENTS, LAUNCH VEHICLES, SPACECRAFT MODULES, TRUSSES, SPACE ERECTABLE...

A FORTRAN subroutine to NASTRAN which constructs coriolis and centripetal acceleration matrices, and a centrifugal load vector due to spin about a selected point or about the mass center of the structure is discussed. The rigid translational degrees of freedom can be removed by using a transformation matrix T and its explicitly given inverse. These matrices are generated in the subroutine and their explicit expressions are given.

Topics: NASA Technical Reports Server (NTRS), DYNAMIC STRUCTURAL ANALYSIS, RIGID STRUCTURES, SUBROUTINES,...

The derivation of the equations of motion is based upon the principle of virtual work. As developed, these equations apply only to a space vehicle whose physical model consists of a rigid central carrier supporting several flexible appendages (not interconnected), smaller rigid bodies, and point masses. Clearly evident in the equations is the respect paid to the influence of the Earth's gravity field, considerably more than has been the custom in simulating vehicle motion. The effect of...

Topics: NASA Technical Reports Server (NTRS), EQUATIONS OF MOTION, GRAVITATIONAL EFFECTS, SPACE STATIONS,...

The basic solution to the problem of mechanical contact between elastically deforming solids was proposed by Hertz over a century ago and has been used by tribologists and others ever since in a steadily increasing number of applications. While the theoretical development is not conceptually difficult and treatments exist to suit all tastes, it is nonetheless interesting to trace the relationships among the solutions in different dimensions. Such an approach is used herein to shed light on the...

Topics: NASA Technical Reports Server (NTRS), ELASTIC DEFORMATION, INTERFACIAL TENSION, STRESS-STRAIN...

Several FORTRAN subroutines and programs were developed which compute complex eigenvalues of a damped system using different approaches, and which rescale mode shapes to unit generalized mass and make rigid bodies orthogonal to each other. An analytical proof of a Minimum Constrained Frequency Criterion (MCFC) for a single damper is presented. A method to minimize the effect of control spill-over for large space structures is proposed. The characteristic equation of an undamped system with a...

Topics: NASA Technical Reports Server (NTRS), DAMPING, EIGENVALUES, LARGE SPACE STRUCTURES, ACTUATORS,...

Viewgraphs on tethered systems control are presented. Topics covered include: rigid body simplifications; feedback control; quadratic optimal nonlinear control; quadratic optimal nonlinear controllers; Lyapunov-based nonlinear controllers; sensor/actuator options; tether control; and fuzzy logic control.

Topics: NASA Technical Reports Server (NTRS), CONTROLLERS, FEEDBACK CONTROL, OPTIMAL CONTROL, TETHERED...

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Jul 11, 2010
07/10

by
Baker, W. E.; Kulesz, J. J.; Ricker, R. E.; Westine, P. S.; Parr, V. B.; Vargas, L. M.; Moseley, P. K

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A workbook is presented to supplement an earlier NASA publication, which was intended to provide the designer and safety engineer with rapid methods for predicting damage and hazards from explosions of liquid propellant and compressed gas vessels used in ground storage, transport and handling. Information is presented in the form of graphs and tables to allow easy calculation, using only desk or handheld calculators. Topics covered in various chapters are: (1) estimates of explosive yield; (2)...

Topics: ALUMINUM COMPOUNDS, PANELS, RIGID STRUCTURES, BEAMS (SUPPORTS), BORON COMPOUNDS, SPACE SHUTTLES,...