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 14 of 14 for “"Multi-degree of freedom systems"”.
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Simulating Complex Multi-Degree-Of-Freedom Systems and Muscle-Like Actuators
Modeling of biological organisms and developing robotic systems based on these models are complicated and computationally intensive tasks. In order to reduce the amount of time needed to develop such models, computational tools are required which intelligently determine parameters of the physical …
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A simplified representation of damping force in lumped-parameter systems with linear and nonlinear damping
The objectives of this thesis are to formulate analysis techniques which determine the damping coefficients for each sub-system in the mathematical model of linear multi-degree-of-freedom systems, and to determine modal dissipation functions for nonlinear systems. For the purpose of this study, …
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Model-Based Strategies for Real-Time Hybrid Testing
… in this dissertation extend the capabilities of real-time hybrid testing by facilitating accurate testing of structural systems with larger natural frequencies (e.g., stiff structures or multi-degree-of-freedom systems) and handling larger delays/lags which are typically associated with …
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Boundary condition effects on vibrating cantilever beams
… continue to see increased used in many areas of modem engineering. Their low cost, ease of production and manufacturing, and precision of motion have made them attractive solutions to many controlled motion systems such as nanopositioners or linear platforms. However, in some applications the …
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Application of the Round-Trip theory to electro-dynamic sources of vibration
… by Moorhouse & Elliott at The University of Salford allows the reconstruction of mechanical frequency response functions at remote locations on a test structure, without the need to physically measure at that location. This makes the identity a powerful tool in the field of modal analysis, …
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System identification of dynamic structural systems using continuous-time domain methods
Structural system identification is the process of deducing the properties of a structural system from its measured response to ambient vibration by fitting a mathematical model. The objectives of this study are to: (1) investigate the use of existing system identification methods, and (2) develop …
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Performance of Nonlinear Mechanical, Resonant-Shunted Piezoelectric, and Electronic Vibration Absorbers for Multi-Degree-of-Freedom Structures
… 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 work to vibration absorbers in their three major physical …
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Improved wind tunnel testing and data reduction methods using a magnetic suspension system
… by the magnetic suspension and balance system of Southampton University. Quasi-static and dynamic forces and moments are measured at low tunnel air flow speeds.</p><p class="MsoNormal">A systematic study of the incidence ramp technique established limitations set by the model aerodynamic …
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Vibration Measurement Based Damage Identification for Structural Health Monitoring
The focus of this research is on the development of vibration response-based damage detection in civil engineering structures. Modal parameter-based and model identification-based approaches have been considered. In the modal parameter-based approach, the flexibility and curvature flexibility …
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Development and Applications of Finite Elements in Time Domain
… method (TFM) to obtain transient responses of both linear, nonlinear, damped and undamped systems. Also the formulation, used in the h-, p- and hp-versions, is extended and found to be readily amenable to multi-degree-of-freedom systems. The resulting linear and nonlinear algebraic equations …
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Problems in nonlinear dynamics
Three types of problems in nonlinear dynamics are studied. First, we use a complex-variable invariant-manifold approach to determine the nonlinear normal modes of weakly nonlinear discrete systems with one-to-one and three-to-one internal resonances. Cubic geometric nonlinearities are considered. …
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Structural damage detection using ambient vibrations
The objective of this research is to use structure ambient random vibration response to detect damage level and location. The use of ambient vibration is advantageous because excitation is caused by service conditions such as normal vehicle traffic on a highway bridge, train passage on a railroad …
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Probabilistic optimization of vibrational systems under stochastic excitation containing extreme forcing events
… interest for efficient quantification schemes of the response statistics of vibrational systems operating in stochastic settings with the aim of providing optimal parameters for design and/or operation. Examples include energy harvesting configurations from ambient vibrations and stochastic …
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Sulla progettazione in zona sismica di strutture dotate di dissipatori fluido-viscosi: proposta di una metodologia
… is focused on the technical characteristics of these devices, their mechanical behavior and the latest evolution of the technology whose they are equipped. In the second section we report the definitions and the guide lines about the design of these devices included in some international …