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 25 for “"Nonlinear vibration"”.
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Nonlinear vibration analysis of inflatable dams
In recent years the use of inflatable dams has become more widespread throughout the world. Various people have done studies on the shape and membrane tension of these structures; however, only a few authors have considered dynamic behavior. Due to the nature of the applications and the material …
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Nonlinear vibration of beam and multibeam systems
… and theoretical investigation into the nonlinear vibration of beam and beam-like structures with rectangular cross sections is presented. Two structures, a cantilever beam subject to a harmonic external excitation and a portal frame subject to a harmonic base motion, are the objects of …
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Nonlinear vibration analysis of viscoelastic plates with fractional damping
… fractional integrals. In the present study, the nonlinear vibration analysis of a rectangular composite plate with fractional viscoelastic properties has been analytically investigated. The plate is modeled based on the von Kármán plate theory, and the Caputo’s fractional derivative has been …
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Active Nonlinear Vibration Control of Engineering Structures of Multiple Dimensions
An active nonlinear mechanical vibration control strategy is developed in the research of the author’s PhD program for the nonlinear vibration control of engineering structures of multiple dimensions. The proposed control strategy has been applied in several wildly applied typical engineering …
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Crack identification and characterization in beams by nonlinear vibration analysis
The slight nonlinear character of a vibrating cracked beam is exploited for the purpose of determining crack location, crack depth, and crack-opening load. The approach is motivated by examining the response of a bilinear spring-mass system to excitation at two frequencies, such that the sum or …
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Nonlinear vibration and frequency response analysis of piezoelectric-based nanotube resonators
To study the vibration behaviour of nanotube-based structures, different models of nanotubes under the effects of piezoelectric layer, intermediate mass, fluid flow and structure curvature are developed. The frequency responses of proposed models for both free and forced vibrations under single …
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Nonlinear vibration energy harvesting : fundamental limits, robustness issues, and practical approaches
… implants to the point where harvesting ambient vibration, a universal and widely available source of energy, has become a viable alternative to costly and bulky traditional batteries. However, implementation of vibratory energy harvesters is currently impeded by three main challenges: broadband …
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A method of characterisation of the nonlinear vibration transmissibility of cushioning materials
… in shipment can be ascribed to shocks and vibrations experienced during transportation. Vibrations can cause resonance, which has the potential to damage the product or cause the failure of critical elements within due to the repetitive application of stresses. The response behaviour of …
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Nonlinear vibration energy harvesting by intentional excitation of high-frequency dynamical instability
In this thesis, a vibration-based energy harvesting system utilizing essential (nonlinearizable) nonlinearities and various electromechanical coupling elements is investigated. These elements include electromagnetic and piezoelectric methods of energy conversion. The mechanical system of interest …
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Nonlinear vibration and chaotic motion of uniform and non-uniform carbon nanotube resonators.
Vibration analysis of carbon nanotubes (CNTs) is very essential field owing to their many promising applications in tiny instruments. The unique and interesting properties of CNTs, particularly their mechanical and electrical features, have fascinated industries and researchers to implement CNTs …
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Nonlinear vibration of beams and plates resting on elastic foundations having nonlinear stiffness properties
… pavements, and runways. Investigating the vibration of beams and plates is an ongoing topic, and researchers are becoming more interested in it. Because the structure foundation is the most important part of the building process, engineers and designers dedicate more attention to that part …
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Multimode Nonlinear Vibration Analysis of Stiffened Functionally Graded Double Curved Shells in a Thermal Environment
… work is to develop a multi-modal analysis of the nonlinear response of stiffened double curved shells made of functionally graded materials under thermal loads. The formulation is based on the first order shear deformation shell theory in conjunction with the von Kármán geometrical nonlinear …
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Analysis of a Nonlinear vibration absorber for vibration control in a hand-held impact machine
… approximately 20% of operators risk developing vibration-related hand injuries, which can be career-ending. As a step toward improving the safety of these tools, this dissertation focuses on modeling their dynamic behavior to evaluate the effectiveness of vibration control strategies. The …
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Evaluation of linear and nonlinear vibration methods to characterize induced microstructural damage in portland cement-based materials
… study was to investigate the use of practical vibration methods to characterize the behavior of portland cement paste and mortar subjected to oven drying and alkali silica reaction (ASR) activity, respectively, and thus to infer and to distinguish the resulting microstructural changes. The …
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Performance of Nonlinear Mechanical, Resonant-Shunted Piezoelectric, and Electronic Vibration Absorbers for Multi-Degree-of-Freedom Structures
Linear vibration absorbers are a valuable tool used to suppress vibrations due to harmonic excitation in structural systems. Limited evaluation of the performance of nonlinear vibration absorbers for nonlinear structures exists in the current literature. The state of the art is extended in this …
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Constitutive Modeling of Friction in Bolted Connections
… poses a significant challenge to modeling the nonlinear vibration of assemblies. This thesis applies empirical and physics-based modeling approaches to identify improvements to current models and a potential path towards predictive models of friction in bolted joints. The empirical modeling …
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Long Time Dynamics of Spherical Objects Governed by Surface Tension
… curvature operator makes both problems highly nonlinear. In the first part of this thesis, we study the long time behavior of an idealistic model of elastic membrane driven by surface tension and inner air pressure. The system is a degenerate quasilinear hyperbolic one that involves the mean …
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Advantageous Utilization of Nonlinear Phenomena in Micro-Structures and Macro-Structures: Applications to Micro-Resonators and Atomic Force Microscopy
Within this work, the nonlinear oscillations of various beam-like structures are studied. Methods are developed to analyze systems of this type to better understand their behavior in order to utilize the nonlinear phenomena associated with them and to provide insights for device development. The …
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Vibration analysis of cracked aluminium plates
… famous books, ‘Perturbation Methods’ (1974) and ‘Nonlinear Oscillations’ (1979, with D.T.Mook), and also by J.Murdock (1990), and M.P.Cartmell et al. (2003) and has been shown to be immensely useful for a wide range of nonlinear vibration problems. In this work it is shown that different boundary …
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Implications of nonlinear suspension behaviour for feedforward control of road noise in cars
… of a linear control system, is the behaviour of nonlinear components in the suspension. The purpose of this research is to identify potential sources of nonlinearity in a car’s suspension and investigate their influence on the propagation of structure-borne road noise into the cabin. The details …
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