WorldCat Identities

Loewy, Robert G.

Overview
Works: 24 works in 44 publications in 1 language and 636 library holdings
Genres: Conference papers and proceedings 
Roles: Author
Classifications: TJ1057, 621.823
Publication Timeline
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Most widely held works by Robert G Loewy
Dynamics of rotating shafts by Shock and Vibration Information Center( Book )

11 editions published between 1969 and 1970 in English and held by 184 WorldCat member libraries worldwide

The monograph contains six topical chapters. These are devoted to three main topics: lateral motion, coupled lateral and torsional motion, and balancing. The latter two are separate chapters. Because the preponderance of existing literature treats the first topic, and because several important subphenomena must be treated within the context of lateral motion, four chapters are devoted to the subject of lateral motion. These attempt to present physical descriptions of the phenomena, review important results, introduce the reader to the mathematical foundations, and discuss forced response briefly, in Chapters 2, 3, 4, and 5, respectively. The scope of this monograph was such that not all of the many references could be exhaustively digested and reported. An attempt was made to deal with the most important, and these are cited in the text. All references, whether perused or not, are listed to produce as complete a bibliography on the subject as possible. (Author)
Composite structural materials : semi-annual progress report, April 30, 1983 through September 30, 1983 by George S Ansell( Book )

2 editions published in 1983 in English and held by 157 WorldCat member libraries worldwide

Composite structural materials : semi-annual progress report, September 30, 1983 through April 30, 1984 by George S Ansell( Book )

2 editions published in 1984 in English and held by 153 WorldCat member libraries worldwide

Composite structural materials : semi-annual progress report, September 30, 1984 through April 30, 1985 by Robert G Loewy( Book )

1 edition published in 1985 in English and held by 71 WorldCat member libraries worldwide

Matrix holzer analyses for fully-coupled vibrations of clustered launch-vehicle configurations including applications to the Titan IIIC and uncoupled Saturn I cases by Robert G Loewy( Book )

4 editions published in 1966 in English and held by 17 WorldCat member libraries worldwide

A theory for predicting the rotational and vortex noise of lifting rotors in hover and forward flight by S. Gene Sadler( Book )

3 editions published in 1969 in English and held by 17 WorldCat member libraries worldwide

Theory for predicting rotational and vortex noise of lifting rotors in hovering and forward flight
International Conference on Rotorcraft Basic Research : National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, 19-21 February 1985 by International Conference on Rotorcraft Basic Research( Book )

1 edition published in 1985 in English and held by 12 WorldCat member libraries worldwide

Analytical Investigation of the Aerodynamic Stability of Helical Vortices Shed from a Hovering Rotor( Book )

1 edition published in 1973 in English and held by 2 WorldCat member libraries worldwide

A small-perturbation stability analysis of a doubly infinite array of interdigitated, right circular helical vortices has been formulated. This array corresponds to the vortices trailed from the tips of the blades of a helicopter rotor or propeller in static thrust or axial flight condition and at great distance from the plane of rotation of the blades. The analysis makes use of the Biot-Savart law of induction and the Vorticity Transport Theorem. The singularities in the Biot-Savart integration for self-induction have been eliminated by substituting approximate functions. Near-singular behavior in other integrals has been minimized by adding and subtracting functions with similar near-singular behavior and which have exact, closed-form integrals. (Modified author abstract)
Matrix Holzer analyses, for fully-coupled vibrations of clustered launch-vehicle configurations including applications to the Titan III C and uncoupled Saturn I cases by Robert G Loewy( Book )

1 edition published in 1966 in English and held by 1 WorldCat member library worldwide

Studies of the Structural Dynamic Behavior of Satellite Antenna System( Book )

1 edition published in 1987 in English and held by 1 WorldCat member library worldwide

A Transfer Matrix (TM) Analysis is formulated to predict the natural modes and frequencies of hoop-maypole type satellite antenna systems. Two directions of bending, axial extension/compression and torsion are represented as coupled by feed assemblies canted with respect to the mast, solar panels tilted out of the plane of the center structure and masses offset from the mast centerline. Shear deflections, large steady cable loads and large compressive loads are accounted for in appropriate members. Using properties chosen as representative of such structures, trends are predicted with variations in size and configuration for several simplified configurations; these include, (a) two-dimensional cable-suspended rigid bars on a flexible center body (mast), (b) T and H -shaped center body sub structures in two and three-dimensional vibrations and (c) cable-stiffened, planar polygonal hoop assemblies. IN the last of these cyclic symmetry had to be invoked to avoid numerical difficulties. Some general conclusions are drawn regarding the free vibrations of such structures. The TM approach is seen as a viable alternative to FEM analyses, when structures are encountered which have major substructures with one dimension longer than its others. Full use of the TM analysis for hoop-maypole type structures must await a reformulation in which cyclic symmetry can be invoked, as in the plane hoop cases
Composite structural materials : annual progress report, May 1, 1986 through April 30, 1987 by George S Ansell( Book )

3 editions published between 1979 and 1985 in English and held by 1 WorldCat member library worldwide

The longstanding technological demand for improved performance in materials continues unabated. In fact, the promise of more than a decade in filamentary composite materials has generated intense interest. Such interest is well founded, having been generated by the possibility of using brittle materials with high modulus, high strength, but low density in composites which fail in a non-catastrophic manner. Such fiber reinforced composite materials offer substantially improved performance and potentially lower costs for aerospace hardware. Fulfilling the promise of composite materials, however, requires a strong technology base. NASA and AFOSR have realized that to fully exploit composites in sophisticated aerospace structures the technology base must be improved. This, in turn, calls for expanding fundamental knowledge and the means by which it can be successfully applied in design and manufacture. It also calls for expanding the body of engineers and scientists competent in these areas. As part of their approach to accomplishing this, NASA and AFOSR have funded the current composites program at Rensselaer. The purpose of the RPI composites program is to develop advanced technology in the areas of physical properties, structural concepts and analysis, manufacturing, reliability and life prediction. (MM)
A two-dimensional approximation to the unsteady aerodynamics of rotary wings by Robert G Loewy( Book )

1 edition published in 1955 in English and held by 1 WorldCat member library worldwide

Nonlinear Aeroelastic Effects in Damaged Composite Aerospace Structures by Robert G Loewy( Book )

in English and held by 1 WorldCat member library worldwide

Matrix micro-cracking affects the stiffness properties of composite laminates and the corresponding sectional stiffnesses, most prominantly laminates exhibiting elastic coupling. Matrix micro-cracking gives rise to nonlinear materials behavior in the presence of nonuniformly distributed crack densities. Such matrix damage appears to have little effect on basic bending-torsion flutter speed. However, this damage can induce a limit cycle behavior at airspeeds somewhat below the flutter speed. The effect of damage on the aeroelastic behavior of wing-aileron systems is found to be more pronounced. Here again flutter speeds were found to be slightly lower in the presence of damage. However, in this case, a limit cycle behavior was observed for a significant range of airspeeds below the flutter speed. Reduced fatigue life could result from this limit cycle behavior, since much higher cyclic stresses are generated thereby in the wing-aileron structure
Tables of two-dimensional oscillating airfoil coefficients for rotary wings by Robert G Loewy( Book )

2 editions published in 1955 in English and held by 1 WorldCat member library worldwide

Dynamic analysis of rotor blades with root retention design variations( Book )

1 edition published in 1992 in English and held by 1 WorldCat member library worldwide

"Smart structure" controlled aeroelastically unstable rotor by Robert G Loewy( Book )

1 edition published in 1995 in English and held by 1 WorldCat member library worldwide

Nonlinear analysis of anisotropic rods using curvature transformation and including warping by Aviv Rosen( Book )

1 edition published in 1992 in English and held by 1 WorldCat member library worldwide

Final report of the Center of Excellence in Rotary Wing Technology( Book )

1 edition published in 1993 in English and held by 1 WorldCat member library worldwide

The activities of a Center of Excellence in Rotary Wing Technology at Rensselaer Polytechnic Institute under a second, continuation five year contract with the U.S. Army Research Office are reported here. These include measures taken to revise and update comprehensive and in-depth curricula at advanced levels in rotorcraft technology; attract and retain outstanding young people in these programs; perform basic research at the leading edge of technology in structures, structural dynamics, unsteady aerodynamics and aeroelasticity disciplines as applied to rotorcraft; and accomplishing technology transfer to the rotorcraft community beyond the Rensselaer campus. Descriptions, references and statistics are provided to allow assessment of the extent to which these goals have been realized
A determination of the effect of aerodynamic forces on the transient stresses in airplane wings during landing by Robert G Loewy( )

1 edition published in 1948 in English and held by 1 WorldCat member library worldwide

A theory for predicting the rotational noise of lifting rotors in forward flight, including a comparison with experiment by R. G Loewy( Book )

1 edition published in 1966 in English and held by 1 WorldCat member library worldwide

A theory and resultant calculations are presented, predicting the noise generated by a lifting rotor in forward flight. With suitable adjustments in parameters, this theory reproduced (by numerical integration) the closed form results of Garrick and Watkins in their investigation of noise produced by a propeller. The theory presented here accounts for (1) asymmetry of inflow, lift, and drag; (2) non-linear section characteristics, compressibility, and reverse flow; (3) first harmonic and steady rigid blade flapping and pitching; (4) rotor shaft tilt; and (5) chordwise distribution of lift and drag forces. Sound pressure levels were evaluated for up to 20 harmonics at a general field point translating with the rotor hub, for the H-34 and HU-1 helicopters. A comparison with experiment is also presented. (Author)
 
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English (40)