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 111 for “"mechanical system"”.
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Macro-modeling of micro-electrical-mechanical system devices
… Institute of Technology, Dept. of Mechanical Engineering, 1998.
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Design of a mechanical system for tillage tool depth control on small farm tractor
… therefore they must be designed with caution and mechanical integrity. Tillage tool attachment systems must be designed to determine a tool's maximum depth into the soil and withstand the resulting forces from the soil. The following paper presents a design for an attachment system that …
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Coupled electro-mechanical system modeling and experimental investigation of piezoelectric actuator-driven adaptive structures
… and parametric optimization of the integrated system. The statics-based modeling approaches have been applied to model piezoelectric (PZT) actuator-driven adaptive structures. The dynamic interaction between the actuators and their host structures has been ignored, and the system energy …
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Determining Parameters for a Lagrangian Mechanical System Model of a Submerged Vessel Maneuvering in Waves
… parameters for a nonlinear Lagrangian mechanical system model of a submerged vessel maneuvering near waves is presented. The nonlinear model with determined parameters is capable of capturing nonlinear effects neglected by other linear models, and therefore can be applied to improve …
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A pseudo-optimal control approach for a redundant degree-of-freedom in a gimbaled mechanical system
Unaided inertial navigation systems of sufficient quality allow a missile or other body to navigate freely for potentially long periods of time. The use of four gimbals in such systems allows for elimination of large platform excursions while avoiding the uncontrollable condition of gimbal lock. …
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A modal analysis method for a lumped parameter model of a dynamic fluid system
… is developed for the analysis of dynamic fluid systems and the techniques of modal analysis are applied. An introduction to the lumped parameter modeling approach is accomplished by a thorough review of the dynamic mechanical system. This review of mechanical system analysis introduces terms …
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The link between HVAC type and student achievement
… and practitioners have found that the type of mechanical system utilized to thermally condition a space impacts the noise level for occupants. Indeed, in schools, air conditioning systems are by far the largest contributors to room noise (Bradley, 2002; Nelson et al., 2005; Siebein et al., …
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Optimum Damping of Beam Vibrations Using Piezoceramic Transducers
In this thesis a piezo-electro-mechanical system, constituted of an aluminum beam with five piezoelectric patches glued on it, each of them shunted with an RL electrical circuit, has been numerically and experimentally investigated, in order to determine the optimal electric tuning parameters for …
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Mechanical design of a quadruped robot
This thesis presents the mechanical design and fabrication of the Super Mini Cheetah (SMC) robot, a small ( 9kg) quadruped that is capable of jumping, bounding and trotting. The robot is designed using commercially available components and rapid prototyping methods, resulting in a low-cost, …
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Iteration Methods For Approximating The Lowest Order Energy Eigenstate of A Given Symmetry For One- and Two-Dimensional Systems
Using the idea that a quantum mechanical system drops to its ground state as its temperature goes to absolute zero several operators are devised to enable the approximation of the lowest order energy eigenstate of a given symmetry; as well as an approximation to the energy eigenvalue of the same …
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An automatic crowd-hoist regulator for the strip mining industry
… IV and Appendix 1 presents the analytical system requirements which are basically determined from an analysis of the system's inherent mechanical oscillatory frequency. Section VA is concerned with the development of the hoist and crowd motion transfer functions which are necessary to …
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Treatment of Uncertainties in Vehicle and Terramechanics Systems Using a Polynomial Chaos Approach
Mechanical systems always operate under some degree of uncertainty, which can be due to the inherent properties of the system parameters, to random inputs or external excitations, to poorly known parameters in the interface between different systems, or to inadequate knowledge of the dynamic …
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First Principles Study Of Tribopolymerization On Conductive Material Surfaces
… used to lubricate and to protect the surfaces of mechanical gears, it is considered as a major source of contamination to Micro-electro-mechanical system and Nano-electro-mechanical system (MEMS and NEMS) transistors. MEMS and NEMS, analogous to atomic force microscopy (AFM) devices, design with …
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Monolithic In-Plane Tunable Optical Filter
… presents the development of a Micro-Electro-Mechanical System (MEMS) monolithic in-plane tunable optical filter in both Indium Phosphide and Silicon. By placing one mirror of a waveguide-based Fabry-Perot interferometer on an electrostatically-actuated beam, a tunable filter is constructed. …
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MULTI-SCALE DYNAMICS OF MECHANICAL SYSTEMS WITH FRICTION
… rough surfaces occurs in numerous engineering systems and in many instances influences the macro behavior of the system. In many instances, the interaction between rough surfaces, affect the macro behavior of the system. Effective treatment of systems containing rough surface contact requires …
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Visualizing the Invisible: Generating Explanations of Scientific Phenomena
… This hypothesis was tested in two domains, a mechanical system and a chemical system. The explanations were analyzed for content, and learning assessed by a post-test. Participants' spatial ability was also assessed as spatial ability often correlates with learning science. For the verbal …
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Low-cost interrogation of optical fibre Bragg grating sensors
… to measure the distributive strain response of a mechanical system. Using neural network processing methods we demonstrate the measurement capabilities of a scalable low-cost fibre Bragg grating sensor network. This network has been shown to be comparable with the performance of existing fibre …
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Design of a Mechanically Divinatory I Ching Split-Flap Display Device
… centered around the design and modeling of a mechanical split-flap display device with anthropological applications in connections to the I Ching, an ancient Chinese divination technique. The device was designed to be an interactive mechanical system to introduce new perspective on different …
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Stability problems in constrained pendulum systems and time-delayed systems
… the boundary of stability of a class of linear mechanical systems as a function of a parameter. We consider two different systems under this class: a constrained double pendulum connected by a rigid rod and a state-feedback-controlled mechanical system with time delay. In the first system, the …
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Modeling And Control of Variable Speed Wind Turbines
… over the past decades. Among the wind turbine systems, Variable speed wind turbines are the most preferred one since it is cheaper, more efficient and has more of control capabilities over the produced active and reactive power. This thesis is prepared in order to contribute to the better …
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