Perturbation and harmonic balance methods for nonlinear panel flutter Technical report, 11 Dec. 1969 - 15 Mar. 1971
Nonlinear panel flutter analyses by perturbation and harmonic balance methods
Dugundji, J.↗
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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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Lunar gravitational field - A thirteenth degree and order spherical harmonic estimate
Lunar Orbiter tracking data analyzed to yield thirteenth degree and order spherical harmonic approximation to lunar gravitational potential function
Anderson, S. G.↗
Turbulence of electrostatic electron cyclotron harmonic waves observed by Alouette-2 and OGO-5
Comparison of Alouette-2 and OGO-5 observation of turbulence of magnetospheric electrostatic electron cyclotron harmonic waves
Oya, H.↗
Deflection analysis of damped rotors with harmonic support forces
Viscous damping and harmonic disturbing forces in rotors with critical speed, support deflection, and support phase angle determinations
Cavicchi, R. H.↗
Orbit perturbation theory using harmonic oscillator systems
Harmonic oscillator systems applied to orbit perturbation theory with two body motion
Blair, W. B.↗
Gravity and gravity gradient from spherical harmonics, case 310
Explicit and recursive formulas for acceleration and gravity gradient derived from spherical harmonics
Heffron, W. G.↗
The transformation of a series expansion in solid spherical harmonics under translation and rotation of coordinates
Transformation formulas in solid spherical harmonics for calculating forces between two homogeneous hemispheres with examples involving coordinate translation and rotation
Lee, W. N.↗
The transformation of external harmonic series under a translation of origin
Transformation properties of coordinates in inverse power spherical harmonic expansions
Madden, S. J., Jr.↗
Spherical harmonic analysis of worldwide cosmic ray variations during geomagnetic storms
Spherical harmonic analysis of worldwide cosmic ray variations during geomagnetic storms, using ground station and satellite data
Akasofu, S.-I.↗
Propagation of harmonic waves in a composite elastic cylinder
Elastic harmonic waves propagation in composite circular elastic cylinder
Dowell, E. H.↗
Whistlers with harmonic bands caused by multiple stroke lightning
Whistlers with harmonic bands caused by multiple stroke lightning, using Injun 5 VLF data
Gurnett, D. A.↗
Reduction of alternator apparent-power requirements and harmonic distortion caused by phase-controlled parasitic loads
Steady state analysis of phase controlled parasitic current, discussing reduction of alternator apparent power requirements and harmonic distortion
Gilbert, L. J.↗
Martian surface harmonics and continental drift
Mars surface harmonics and continental drift from radar and spectroscopic topographic height determination
Wells, R. A.↗
Optical second harmonic generation in biological systems
Optical second harmonic generation in excised tissues by Q switched ruby laser irradiation, observing narrow band emission line in collagenous tissues
Fine, S.↗
Space harmonics in unified electrical-machine theory
Unified electrical machine theory with allowance for space harmonics effects, transforming time- dependent linear differential equations into linear time-invariant equations
Willems, J. L.↗
Earth zonal harmonics from rapid numerical analysis of long satellite arcs
A zonal geopotential is presented to degree 21 from evaluation of mean elements for 21 satellites including 2 of low inclination. Each satellite is represented by an arc of at least one apsidal rotation. The lengths range from 200 to 800 days. Differential correction of the initial elements in all of the arcs, together with radiation pressure and atmospheric drag coefficients, was accomplished simultaneously with the correction for the zonal harmonics. The satellite orbits and their variations are generated by numerical integration of the Lagrange equations for mean elements. Disturbances due to precession and nutation of the earth's pole, atmospheric drag, radiation pressure and luni-solar gravity are added at from 1- to 8-day intervals in the integrated orbits. The results agree well with recent solutions from other authors using different methods and different satellite sets.
Wagner, C. A.↗
Third-harmonic generation in phase-matched Rb vapor.
The generation of 0.3547-micron radiation was performed by tripling 1.064-micron radiation in a phase-matched mixture of rubidium vapor and xenon. A third-harmonic nonlinear susceptibility in Rb vapor is confirmed. It is about 100,000 times greater than that of He. This large susceptibility is due to the large oscillator strengths and resonant enhancements resulting from Rb transitions in the near infrared, visible, and UV.
Young, J. F.↗
Efficient second harmonic generation of picosecond laser pulses.
Efficient conversion to the second harmonic (SH) using KD2PO4 and CsH2AsO4 crystals inside a folded cavity of a high-power-dye mode-locked neodymium-glass laser is reported. For the first time, frequency-doubled picosecond light pulses have been obtained in CsH2AsO4 with peak powers of the order of 1 GW/sq cm at 0.531 micron for an effective pump power density of 4 GW/sq cm.
Rabson, T. A.↗