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 45 for “"restoring force"”.
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Chemomechanics with a molecular force probe
… relies on the concept of molecular restoring force. We developed a general framework of force-dependent kinetics from the normal mode formalism, and simplified it in the form of Taylor expansion. Molecular force probes are inert molecules that allow incremental variations in …
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Design and Analysis of a Novel Wave Energy Converter With a Tension Leg Platform and Oscillating Proof Masses
… in the direction of surge. Complex hydrodynamic forces caused by ocean waves will excite the system and the surge motion of the proof mass relative to the tension leg platform will generate power via the electromagnetic power takeoff mechanism. First a model of the system with a linear restoring …
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Behavior of Post-Tensioning Systems Subjected to Inelastic Cyclic Loading
… employed in a number of self-centering seismic force resisting systems as part of the restoring force mechanism which virtually eliminates residual building drifts following seismic loading. As a result of the PT strands large elastic deformation capability, they have been proven to work …
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Analysis of a one-dimensional nonlinear mechanical model and its application to the qualitative explanation of the visco-elastic behavior of aluminum from sonic tests
… mechanical model incorporating both a nonlinear restoring force and nonlinear viscous damping in its system. Observations of the test results show that the restoring force is best described by a linear spring, but that the damping can indeed be described, at least qualitatively, by a nonlinear …
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Vibration isolation systems using hysteretic multiple tuned mass damper oscillators
… density. In order to introduce hysteretic restoring force to the oscillators and study its effect to the vibration reduction on the main structure the Bouc-Wen differential model of hysteresis is used. The introduction of hysteresis to the oscillators is observed to increase the vibration …
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Seismic Damage Analysis and Design of Unreinforced Masonry Buildings
… repeated loadings. Model parameters for unreinforced brick masonry were obtained from cyclic load tests of masonry wall specimens. A random vibration method using a nonlinear hysteretic restoring force model to describe the load-deformation behavior of masonry was adopted to evaluate the …
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Experimental Identification of Nonlinear Systems
… by using the parameters extracted to predict the force-response curves at other nearby frequencies. We then compare this technique with two other techniques that have been presented in the literature. In addition to the amplitude- and frequency-sweep technique presented, we apply a second …
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Targeted energy transfer using nonlinear energy sinks for the attenuation of transient loads on building structures
… stiffness elements. The essentially nonlinear restoring force provided by these elements allows the NES to interact with any mode of the primary structure to which the NES is attached and participate in targeted energy transfer (TET), the broadband transfer of energy from the primary structure …
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Dynamics of Small Elastic Systems in Fluid: Tension and Nonlinearity
… for a spatially applied harmonic driving force, and demonstrates quantitative agreement with an experimental beam that is driven electrothermally, in both air and in water. For the stochastic dynamics, the noise spectrum describes the thermal fluctuations at a given frequency. The …
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Investigation of the Behavior of Free-Standing Gabions in Seismic Regions
… bordering Kenya. The corresponding lateral forces to these spectral displacements were found, and the restoring eccentricities from the soil restoring force were backed out through a summation of moments. All analysis was experimentally done due to the complexity of properly modeling the …
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Aplicabilidade de uma máquina teste eletrodinâmica a molas não lineares
… tester by a two degrees af freedom system with restoring force F =(α+βx²)x is made on an analog computer EAI – TR48 DES – 30. The favorable values of the spring deflection ratio y1 /(y2 - y1) the frequency of the exciting force, and y2 the amplitude of motion of the mass m2, as function of the …
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Computational Investigations of Cellular Functions: Three Cases on Membrane Morphogenesis, Organization and Assembly of a Multi-Protein Complex, and the Molecular Origin of Muscle Elasticity
… muscle from overstretching by producing a restoring force when a muscle fiber is extended beyond its normal length. Force spectroscopy studies have shown that titin exhibits several regimes of elasticity. Disordered segments bring about a soft, entropic spring-type elasticity; secondary …
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A novel binary actuator using shape memory alloy
… Memory Alloy (SMA), to generate the actuation force. A compliant bistable mechanism provides the restoring force that pre- strains the martensitic Nitinol, and thus makes the actuator binary. Binary actuation alleviates some of the problems that would otherwise limit the effectiveness of …
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Performance improvement of a proof-mass actuator using nonlinear control
… While these actuators have a favorable force-to-weight ratio, the finite travel of the proof-mass, called the stroke length, imposes restrictions on the use of the actuator. This restriction implies that the actuator has a finite operating region in terms of initial conditions on the …
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Modeling of nonstationary earthquake ground motion and biaxial and torsional response of inelastic structures
… been considered, e.g., hysteretic behavior of restoring force, biaxial interaction, torsional response and degradation of the structure, and nonstationary behavior of ground excitation. A new stochastic ground motion model is proposed in which both intensity and frequency content are functions …
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TeachBot : an education system workforce development
… industries. We present a new type of workforce training system using a collaborative robot and online learning system for expanding the user base of robots. TeachBot is a robotic instructor that delivers a series of lectures stored on an online learning site. TeachBot is also a …
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Electromechanical modulation of electrical conduction through organic thin films for switching applications
… of the electrodes, while also providing the restoring force necessary to turn off the switch when the electrostatic force is removed, mitigating stiction-induced failure. In this thesis, the feasibility of the proposed switching mechanism is investigated through theoretical analysis of two- …
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Chaotic motions of nonlinearly moored structures
… degree of freedom system with a piecewise-linear restoring force function. However, relatively few laboratory measurements of chaotic motions have been reported, and the primary aim of the present study is to investigate the corresponding problem experimentally. Thus, the present work describes …
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Simulation of the catenary effect under wind disturbances in anchoring of small boats
… an input forcing function and various retarding forces and effects. The anchoring system used in the analytical model results in a non-linear but symmetrical restoring force, which resists the force-induced motion of the boat. Two main types of anchor lines are considered: uniform-material and …
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