On gas ingestion and fluid inertia effects in viscoseals.
Turbulent viscoseals gas ingestion and fluid inertia analysis using stability of dynamic gas-liquid interface between rotating cylinders
Fisher, C. F., Jr.↗
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Results for “Inertia”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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On the synthesis of suboptimal, inertia-wheel attitude control systems.
Suboptimal attitude control system for Nimbus satellite using motor-driven inertia wheels as control torque source for three dimensional control
Clark, L. G.↗
Inertia Tests of a 24 Foot Single Keel Parawing, Model 2
Mass moment of inertia tests for parawings in vacuum sphere
Summers, D. O.↗
Experimental investigation of an attitude control system that uses star trackers and inertia wheels
Simulation tests of attitude control system that uses star trackers and inertia wheels
Dishman, B. H.↗
Experimental determination of apparent mass and moment of inertia of a large disk suspended as a pendulum at different air densities
Experimental determination of apparent mass and moment of inertia of large disk suspended as pendulum at different air densities
Dunning, R. S.↗
On the synthesis of suboptimal, inertia-wheel attitude control systems
Suboptimal attitude control system for Nimbus satellite using motor-driven inertia wheels as control torque source for three dimensional control
Clark, L. G.↗
Thermal diffusivity, conductivity and thermal inertia of Apollo 11 lunar material
Apollo 11 lunar specimen thermal diffusivity, conductivity and inertia in breccias and crystalline igneous rocks measured over wide temperature range
Horai, K.-I.↗
Inertia diaphragm pressure transducer Patent
Design and development of inertia diaphragm pressure transducer
Seegmiller, H. L. B.↗
Moment of inertia test fixture Patent
Test fixture for measuring moment of inertia of irregularly shaped body with multiple axes
Conn, J. H.↗
Thermal inertia of Ganymede from 20-micron eclipse radiometry
Ganymede thermal inertia data from simultaneous visual photometry and IR radiometry observations during 17 March 1971 eclipse
Beery, J. G.↗
Compilation of weights, balance, CG, and moments of inertia for sounding rocket payloads
A compilation of weight, balance, center of gravity, and moments of inertia of various sounding rocket payloads are presented. A permanent record of the physical characteristics of sounding rocket payloads in one location is provided. Data for the weight of payloads which the sounding rockets can support are developed. Illustrations of various sounding rockets to show the space available for payloads are included.
Wolff, J. J., Jr.↗
Recent results on the mass, gravitational field and moments of inertia of the moon.
Use of Doppler tracking data from the Lunar Orbiter series of spacecraft in an analysis of the spherical harmonic coefficients of the lunar gravitational field through thirteenth degree and order. The value obtained for the mass of the moon, GM = 4902.84 cu km/sec/sec, is in good agreement with previous results and with results obtained by alternate procedures. Acceleration contour plots, derived from the gravitational coefficients, show correlations with surface features on the near side of the moon, but are of questionable validity for the far side because of the lack of direct tracking data on the far side. Based on the most recent gravitational field data, the current estimate for the polar moment of inertia of the moon is C/Ma squared = 0.4019 super + 0.004 sub - 0.002. This value indicates that the interior of the moon can be homogeneous, but some results presented strongly suggest that the moon is differentiated, with an excess of mass in the direction toward the earth.
Michael, W. H., Jr.↗
Theoretical Pressure Distribution, Apparent Mass, and Moment of Inertia of a Disk Pendulum Oscillating at Low Frequency
Equations are developed which give the pressure profile, the forces and torques on a disk pendulum by means of point source wave theory from acoustics. The pressure, force and torque equations for an unbaffled disk are developed. These equations are then used to calculate the apparent mass and apparent inertia for the pendulum.
Dunning, R. S.↗
Principal axes and moments of inertia of deformable systems
Information about principal axes and moments of inertia is presented in terms of formulas involving solely quantities which can be expressed in literal form whenever central principal axes can be located by inspection for at least one state of a deformable system composed of particles and rigid bodies. Two illustrative examples are worked out in detail.
Kane, T. R.↗
Rotary solenoid shutter drive assembly and rotary inertia damper and stop plate assembly
A camera shutter assembly composed of a pair of superposed opaque planar shutter blades, each having an aperture and being arranged for reciprocal linear movement is disclosed. A pair of rotary solenoids, each connected to one of the blades by a linkage and arranged to be actuated separately at a predetermined interval is provided. An inertia damper and stop plate is built into each solenoid to prevent rebound.
Cable, W. L.↗
A determination of the lunar moment of inertia
An estimate of the second zonal coefficient of the spherical-harmonic representation of the lunar gravitational field has been obtained from an analysis of particular orbital-element variations of the Explorer 35 and Explorer 49 spacecraft. Data from these spacecraft were used because the orbital configurations resulted in variations of the longitude of periapse and node which were, to first order, dependent only on the even zonal harmonics. The data time span for each satellite was extremely long: 2138 days for Explorer 35 and 230 days for Explorer 49. The value of the harmonic coefficient is determined and used to obtain a value of the lunar moment of inertia.
Gapcynski, J. P.↗
Inertia forces in robots and manipulators
A method is described for the simulation of the dynamic behavior (inertia forces) of a solid performing a tridimensional motion, wherein a discrete system of mass points rigidly attached to the solid is used. Three postulates are necessary and sufficient for dynamical equivalence: (1) the mass of the solid and the total of the concentrated masses should be equal, (2) the center of gravity of the solid and of the discrete system should coincide, and (3) the inertial ellipsoid of the solid and of the discrete system should be equal.
Konstantinov, M. S.↗
An improved value of the lunar moment of inertia
The lunar gravitational research reported on by Gapcynski et al., (1975) has been extended to include an additional 600 days of the time variation of ascending node for the Explorer 49 spacecraft. Analysis of these additional data resulted in an improved value of the second-degree zonal harmonic coefficient C(20) = (-2.0219 equal to 0.0091) times 10 to the minus 4. This value of C(20) used in conjunction with the parameters beta equal to libration (631.27 + or - 0.03) times 10 to the minus 6 and gamma to (227.7 + or - 0.7) times 10 to the minus 6 yields a more accurate definition of the lunar moment of inertia ratio equal to 0.391 + or - 0.002.
Blackshear, W. T.↗