Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 311 for “"Natural Frequencies"”.
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Natural frequencies of cantilevered triangular tapered plates
Call number: LD2668 .T4 1966 K78
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Natural frequencies of isotropic circular plates of variable thickness
Digitized by Kansas Correctional Industries
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Natural frequencies of isotropic circular plates of variable thickness
Digitized by Kansas Correctional Industries
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Analysis of natural frequencies of concert harp soundboard shapes
… for a concert harp were modeled and their lowest natural frequencies compared in order to evaluate the claim that a harp with a bulbous extension has richer sound in the lower notes than one with a simple trapezoidal shape. Two models for the soundboards were evaluated, the first using a stiff …
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Prediction of high-speed shaft natural frequencies employing harmonic excitation
A shaft and bearing system was developed with natural frequencies in the range of 8,000 to 60,000 rpm for the purpose of determining the practicality of low-speed harmonic excitation of high-speed natural frequencies. The analytical development and analysis utilized SPAR, a finite element program, …
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Natural frequencies evaluation on existing reinforced concrete bridges using microtremor testing
… been reported several times. Identification of natural frequencies is important to avoid bridge resonance which could happen when frequency of excitation coincides with a bridge natural frequency. Resonance can cause failure to bridges. Therefore, it is important for newly constructed and old …
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Natural frequencies and damping factors for a cable with lumped masses
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982.
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The estimation of natural frequencies and damping ratios of offshore structures
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1980.
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The effect of diagonal stays on the natural frequencies of suspension bridges
Thesis (M.S.) Massachusetts Institute of Technology. Dept. of Civil and Sanitary Engineering, 1949.
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Adult age differences in thinking styles and probabilistic reasoning : the effect of natural frequencies
… chance of a given event happening once and as frequencies, requiring participants to imagine a large number of times or people, and suggesting what number of these might involve the given event. The latter is believed to prime the analytical process of reasoning, particularly when natural, …
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Natural frequencies and an atlas of mode shapes for generally-laminated, thick, skew, trapezoidal plates
… are then extensively studied, and variations in natural frequencies due to geometric parameter changes, such as taper ratio, sweep angle, and value of the parameter q, are discussed. The parameter, q, is a root length multiplier which determines the length of the quarter-chord line, thus …
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Effect of Centrifugal Stiffening on the Natural Frequencies of Aircraft Wings During Rapid Roll Maneuvers
… in rotating beams and consequently on the frequencies of the beam. Multiple cases of the rotating beam are explored in this thesis to investigate effects of mass distribution and boundary conditions on the frequencies of centrifugally stiffened beams. It is found that for a uniform beam …
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A Method for Calculating the Natural Frequencies of Continuous Beams, Frames, and Certain Type of Plates
Made available in DSpace on 2015-05-12T17:06:15Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0006993.PDF: 11426377 bytes, checksum: 2fb48a790260aaa7ec8485242d009758 (MD5) Previous issue date: 1953
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Prediction of natural frequencies of turbine blades for turbocharger application. An investigation of the finite element method, mathematical modelling and frequency survey methods applied to turbocharger blade vibration in order to predict natural frequencies of turbocharger blades.
Methods of determining natural frequencies of the D76D88, B76D88, A86E93, C86G90, C86L90 and C125L89 turbine wheel designs for various environmental conditions were investigated by application of Finite Element Analysis and beam theory. Modelling and simulation methods were developed ; the first …
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Vibrações livres de viga de seção transversal variável
… with the problem of the determination of the natural frequencies of transverse vibrations of beams of variable cross section, in particular beams with section heigh varying according to a polynbmial law. Ritz method is used for the determinátion of the natural frequencies, dueto its rapid …
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Structural performance evaluation of concrete arch dams using ambient vibration monitoring and GNNS systems
… dam responses (deformations, stresses, strains, natural frequencies) which indicate the structural behaviour of dams. This implies that research in the analysis of the collected data is very important. Methods used in the analysis of dam monitoring data include data-driven models, physical-based …
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Vibration suppression in finite length marine cable systems
… cable systems. The models determine cable system natural frequencies, mode shapes and modal damping ratios. The introduction of absorber damping is shown to result in complex roots to the modal characteristic equations. A computer complex root solver is used to solve for the complex roots of the …
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Identification of Physical Changes to a Steel Frame
… AVT was able to preliminarily identify the natural frequencies and mode shapes of the frame. FVT was able to precisely identify four distinct natural frequencies, mode shapes, and damping ratios. The baseline frame then underwent two physical changes: the addition of mass to its roof, and …
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Finite element modeling of a refrigeration compressor for noise prediction applications
… and corrected. After sufficient revisions, 23 natural frequencies (excluding the rigid body modes) are found for the compressor housing in the low frequency range (below 2000 Hz) of analysis. Forced response calculations are also used to correlate the analytical model and test data, with a …
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