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  • 1
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    Use of the dispersion ratio in estimating the nonlinear properties of an object of diagnosis (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: An experimental investigation for estimating the nonlinearity of a diagnostic object was carried out on a single-stage, spur gear reducer. The linearity of the properties of spur gearing (including the linearity of its mode of operation) was tested. Torsional vibrations of the driven wheel and transverse (to the meshing plane) vibrations of the drive wheel on its support were taken as the two outputs of the object to be analyzed. The results of the investigation showed that the degree of nonlinearity of a reducing gear is essentially connected with its operating mode, so that different mathematical models of it can correspond to different values of the system parameters.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 157-159
    Format: text
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  • 2
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    The effect of a small initial curvature on the free vibration of clamped, rectangular plates (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An analytical method of obtaining the natural frequencies and mode shapes of clamped, rectangular plates having a small initial curvature is presented. Specifically, the singular perturbation technique is used to reduce the fourth-order plate vibration problem to the simpler membrane problem with modified boundary conditions that account for the bending effects. The eigenfrequencies for plates with inverse aspect ratios varying between 0.1 and 1.0 and for the dimensionless normal prestress between 0.1 and 1.0 have been presented for values of epsilon, the normalized bending rigidity, ranging between 0.0010 and 0.2500. It is established that a small initial curvature has no effect on the frequency of vibration of the plate. However, its effect is manifested in the eigenmodes.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-178964 , NAS 1.26:178964
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  • 3
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    Free vibration of rectangular plates with a small initial curvature (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The method of matched asymptotic expansions is used to solve the transverse free vibration of a slightly curved, thin rectangular plate. Analytical results for natural frequencies and mode shapes are presented in the limit when the dimensionless bending rigidity, epsilon, is small compared with in-plane forces. Results for different boundary conditions are obtained when the initial deflection is: (1) a polynomial in both directions, and (2) the product of a polynomial and a trigonometric function, and arbitrary. For the arbitrary initial deflection case, the Fourier series technique is used to define the initial deflection. The results obtained show that the natural frequencies of vibration of slightly curved plates are coincident with those of perfectly flat, prestressed rectangular plates. However, the eigenmodes are very different from those of initially flat prestressed rectangular plates. The total deflection is found to be the sum of the initial deflection, the deflection resulting from the solution of the flat plate problem, and the deflection resulting from the static problem.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-179370 , NAS 1.26:179370
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  • 4
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    Advanced fabrication techniques for hydrogen-cooled engine structures (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Described is a program for development of coolant passage geometries, material systems, and joining processes that will produce long-life hydrogen-cooled structures for scramjet applications. Tests were performed to establish basic material properties, and samples constructed and evaluated to substantiate fabrication processes and inspection techniques. Results of the study show that the basic goal of increasing the life of hydrogen-cooled structures two orders of magnitude relative to that of the Hypersonic Research Engine can be reached with available means. Estimated life is 19000 cycles for the channels and 16000 cycles for pin-fin coolant passage configurations using Nickel 201. Additional research is required to establish the fatigue characteristics of dissimilar-metal coolant passages (Nickel 201/Inconel 718) and to investigate the embrittling effects of the hydrogen coolant.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-3949 , NAS 1.26:3949 , AMC-81-17928
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  • 5
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    Boundary flexibility method of component mode synthesis using static Ritz vectors (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A method of dynamic substructuring is presented which provides for the incorporation of a set of static Ritz vectors, referred to as boundary flexibility vectors, as a replacement and/or supplement to conventional eigenvectors in component mode synthesis. The suggested boundary flexibility Ritz vectors are generated by an extension of Wilson's load-dependent Ritz vector algorithm for transient dynamic analysis. The extended algorithm is not load-dependent, is applicable to both fixed-and free-interface components, and results in a general component mode synthesis model appropriate for any type of dynamic analysis.
    Keywords: STRUCTURAL MECHANICS
    Type: Computers and Structures (ISSN 0045-7949); 35; 1 19
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  • 6
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    Calculating a ceiling in the form of a shell rectangular in the plan (1966)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Membrane stresses, bending state, and end effect for elliptical paraboloid ceiling resting on series of columns
    Keywords: STRUCTURAL MECHANICS
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  • 7
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    Vibration modes in the problem of the supersonic flutter of panels (1966)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Vibration mode characteristics of panel flutter in supersonic gas stream flow
    Keywords: STRUCTURAL MECHANICS
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  • 8
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    Analytic description of vibrations in a piping system with pulsating flow (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: Various calculation schemes were proposed for describing vibrations in a piping system with pulsating flow. Methods were selected and applied according to the type of irregularities examined: concentrated ones, extended ones, or complex ones. The selection of a method also depends on comparability of the extent of the irregularities with the pressure wavelength and velocity in the flow. Relations were found which permit a description of the interaction of a pulsating flow with any irregularity in the system. For complex systems with varying temperatures and some irregularities, relations were obtained, which reflect the varying phase displacement of the forces in these irregularities. The effect of the frictional torque on pipeline supports, in the presence of flexural and torsional vibrations was investigated, on the assumption that the frictional torque depends linearly on the angular velocity.
    Keywords: STRUCTURAL MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 51-52
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  • 9
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    Water impact testing of a filament wound case (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: A lightweight Filament Wound Case (FWC) Solid Rocket Booster (SRB) is being developed by NASA to increase the payload capability of the space shuttle. As with the steel boosters, the current plan is to recover the FWC SRB's after they impact the ocean at 65 to 85 ft/sec. As the boosters enter the ocean (nozzle first) the water moves away from the vehicle creating a cavity, which then collapses on the vehicle, and results in a significant loading event. To understand this loading event, tests were conducted on a quarter scale FWC model to measure cavity collapse pressure distributions, deflected shape and the effects of end conditions and pressure scaling.
    Keywords: STRUCTURAL MECHANICS
    Type: Shock and Vibration Information Center The Shock and Vibration Bulletin 55, Part 2; p 57-67
    Format: text
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  • 10
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    Buckling of cylindrical shell end closures by internal pressure (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Buckling of cylindrical shell end closures by internal pressure
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-540
    Format: application/pdf
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