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 44 for “"Structural Stiffness"”.
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Structural Stiffness Gradient along a Single Nanofiber and Associated Single Cell Response
… studies have explored the role of material stiffness (Young's modulus: N/m2) on cell behavior including attachment, spreading, migration, cytoskeleton arrangement (stress fiber and focal adhesion distribution) and differentiation. In this study using our recently described …
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Analysis of flutter and flutter suppression via an energy method
… increased aerodynamic efficiency, decreased structural weight, and higher flight speeds. Preliminary designs often exhibit a flutter instability within the desired operating envelope of the aircraft. Passive methods which have been used to solve the flutter problem include added structural …
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Cell-Fiber Interactions: A New Route to Mechano-Biological Investigations in Developmental and Disease Biology
… and respond to changes in fiber curvature and structural stiffness as evidenced by alterations to cytoskeleton arrangement, including focal adhesion cluster lengths and nucleus shape indices, leading to altered migration speeds. It is hypothesized that these behaviors occur due to modulation of …
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TRUSS ANALYSIS USING SINGULAR IMBEDDING METHOD
<p>In structural analysis and design of trussed structures, the Singular Imbedding Method is applied and formulated to handle joint displacement, member force, and member stress constraints. There are two structural systems, namely, a Displacement Constraining System (DC) and a Force Constraining …
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Studies of the Human Head from Neonate to Adult: An Inertial, Geometrical and Structural Analysis with Comparisons to the ATD Head
… were studied to obtain geometrical, inertial, structural stiffness, and impact properties. The computational tomography (CT) method was used on pediatric heads to get inertial properties, and clinical CT scans were used to develop average head and skull contours for 12 different age groups. To …
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Nonlinear analysis of topology-optimized scissor-like elements during deployment and structural performance analysis
… of finding a trade-off relationship between the structural performance and the required energy for the deployment of scissor chains. From the trade-off relationship, the balance between the structural stiffness, material saving, and power saving is investigated.
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Design and Modeling of a Catapulting Magnetic Transmission for Tuning Energy Storage and Release
… leadscrew, considering both magnetic and structural aspects, (iii) experimentally validated models of the catapulting event in a magnetic leadscrew, and (iv) use of these models in the context of a practical application, namely powered exoskeletons that may reduce the metabolic cost of …
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Finite element model of a tennis ball impact with a racket
… was used to determine the influence of racket structural stiffness, mass and the position of the balance point, when performing a typical topspin forehand. It was found that using a head-heavy racket, with high structural stiffness and mass, will increase the rebound velocity and topspin of the …
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Estruturas tridimensionais com propriedades mecânicas dos materiais representadas matematicamente por séries - aplicação à análise de pontes
… coefficients together at each nodal point the structural stiffness matrix, that results from the coupling between the harmonics, can be banded. The solution of the system of linear equations is obtained by the Gaussian elimination method, employing a block solver. A computer program is …
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Characterizing tensile loading responses of 3D printed samples
… curves were analyzed to find the peak load, structural stiffness, load at plastic yield, and effective strain at failure. Samples loaded along the printed layers with 100% infill density displayed the most favorable mechanical properties. Samples loaded perpendicular or at an angle to the …
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Comparative study of bracing patterns and materials for tall timber buildings
… its potential to mitigate the carbon embodied in structural materials, tall timber buildings are gaining acceptance as various forms are considered for their designs. Recently built and proposed buildings demonstrate the use of mass timber to resist gravity and lateral loads. There are inherent …
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An experimental investigation of oblique wing static aeroelastic phenomena
… from these tests showed that increasing the wing structural stiffness or applying aileron deflection would increase the wing divergence speed. The divergence speed decreased as the sweep angle increased. Further tests were conducted with the wing unconstrained in roll. Results showed that an …
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Damage detection in structures using frequency response function (FRF) data and finite element modelling
This thesis presents a method to detect structural damage using frequency response function (FRF) data obtained from non-destructive vibration tests. The method is used to study cases of early structural damage in which there is no appreciable change in mass and damping. The resulting change in …
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Design of an automated on-car brake lathe
… linear bearings and actuators with dynamic stiffness sufficient to suppress chatter. During this thesis, two prototype cutting heads were designed, manufactured, and tested. The first prototype employed modular linear bearings, and produced unacceptable surface finish due to chatter. …
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Analysis of mixing and thrust diagnostics for shock tunnel hot nozzle testing
… for a high frequency response demanded high structural stiffness in the thrust measurement system. Dynamic modeling confirmed the proposed thrust measurement system will satisfy that requirement. A detailed uncertainty analysis was used to identify the most important factors in the system …
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Hierarchical Assembly of Polymeric Nanofibers for Advanced Material Applications
… with fiber diameter and it dominates fiber stiffness. Our studies demonstrate isotropic arrangement of polymer chains in the fibers and anisotropic arrangement in the necking region for fibers undergone deformation. Finally, this study demonstrates development of force sensors capable of …
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Effect of Hysteresis Type on Drift Capacity for Global Collapse of Moment Frame Structures for Seismic Loads
… response because of degradation in strength and stiffness. To examine the existence and magnitude of this effect, this research aims to: (1) Determine the global collapse capacities of several classes of moment frame buildings under seismic loads. (2) Develop the basis for the seismic criteria …
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Development of standard components for multi-degrees-of-freedom mems positioning stages with closed-loop feedback
… and transducers at the micro-scale and increased structural stiffness and natural frequency of the system in a favorable way. They were fabricated on SOI and double-sided SOI wafers with standard photolithography patterning processes followed by a series of dry and wet etching process steps to …
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Suspended Micro/Nanofiber Hierarchical Scaffolds for Studying Cell Mechanobiology
… nano Newton) were found to scale with fiber structural stiffness (2 -100 nano Newton/micrometer). Cells were observed to shed debris on fibers, which were found to exert forces (15-20 nano Newton). Upon CO? deprivation, cells were observed to monotonically reduce cell spread area and …
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Simulated Response of Degrading Hysteretic Joints With Slack Behavior
… new mathematical hysteresis model describes the stiffness of the individual bolt at each time step increment and accounts for non-linear and slack behavior; a mechanically-based structural stiffness model explains the interaction of one bolt with another bolt within a joint; an analytically-based …
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