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 10 of 10 for “"modal method"”.
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A modal method for the simulation of nonlinear dynamical systems with application to bowed musical intruments
… this thesis, a physical modelling computational method based on a modal approach is developed to perform simulations of nonlinear dynamical systems with particular application to friction-excited musical instruments. This computational method is applied here to three types of systems: bowed …
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Using a non-modal method for system identification of highly damped and high modal density mechanical structures
… is traditionally related to the estimation of modal parameters (natural frequencies, modal damping ratios, and mode shapes). Various well known modal methods often fail to extract these parameters for heavily damped structures with high modal densities due to the high coupling between densely …
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Time Scales, Coherency, and Weak Coupling
… Riccati equation formulation and a particular method for finding its solution led to the result which shows that the singular perturbation method and modal method for reduced order modeling are two extreme points of an iterative method for the time scale decomposition: singular perturbation is …
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Aplicação do método da superposição modal na análise estática não linear de estruturas
The linear buckling mode superpositon method has been utilized as an efficient procedure for geometric nonlinear static analysis of thin-type structures with a mild nonlinear pre-buckling behaviour. This work presents a modal method extension where both geometric and physical nonlinearities are …
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DMD and POD Modal Analysis for Store Separation
… data-set was then used to identify which modal method, POD or DMD, better resolves the known dominate structures of the flow field. The results of this analysis showed the superiority of POD in identifying both free-stream and surface pressure structures. A final representative case of …
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STUDIES OF DYNAMIC RESPONSE OF OFFSHORE GUYED TOWERS
… of the concept of pseudo-forces and the modal method of analysis. The effects of numerous factors on the dynamic response of the structure are investigated. The factors considered include: (1) the relative contribution of the modes of vibration of the system to its response; (2) the …
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Resonances of periodic metal-dielectric structures at the infrared wavelength region
… in the long wavelength region and with Fourier Modal method calculations in the short wavelength. The transmittances of all these meshes show similar resonance peaks and the same dependence on thickness of the short wavelength peaks, suggesting that the interpretation using the oscillator mode …
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Visualizing Vulci: Reimagining an Etruscan-Roman City
… of the site is still unexcavated, an innovative method was created for this project. This ‘n’-dimensional approach layers a series of geospatial and historical data, largely relying on new, non-invasive remote sensing surveys. The main sensors and data sets include a series of older aerial …
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A coupled rotor-fuselage aeroelastic analysis using complex rotor modes
A new modal method capable of analysing the aeroelastic response of rotorcraft in both steady and manoeuvring flight is developed. Particular emphasis is given to the correct modelling of the dynamic interactions between the rotor and the fuselage. This is achieved via the use of complex rotor …
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Inverse Problems In Structural Damage Identification, Structural Optimization, And Optical Medical Imaging Using Artificial Neural Networks
… for the three problems are similar, and a method found suitable for solving one type of problem can be applied for solving other types of problems. Solution of inverse problems using neural networks consists of two parts. The first is repeatedly solving the direct problem, obtaining the …