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 34 for “"Torsional stiffness"”.
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Assessment of lateral and torsional stiffness characteristics of medium rise concrete buildings
… few published measurements of the lateral and torsional dynamic characteristics of buildings to establish accurate analytical models of the structures. These measurements, for five different buildings, consisted of data on their fundamental mode shapes and natural frequencies. Initially, …
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A note on the the present knowledge about torsional stiffness of airplane wings
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautical Engineering, 1935.
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A Self -Healing Poly(dimethyl Siloxane) Elastomer
… of the elastomer is also investigated under torsional fatigue loading. The microcapsule-based self-healing PDMS is capable of recovering a significant portion of the original torsional stiffness and retards dynamic crack growth rate. Depending on the matrix material, a nearly complete …
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Feasibility of helically stiffened construction for a formula racing car structural shell
… racing car structural shell is studied. The torsional deformation behavior of circular and square cross-section shells is analyzed as an approximation to the real car structure. Shells with different sandwich and helically stiffened configurations are analyzed with finite elements. For closed …
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Design and Optimization of Carbon-Fiber Chassis Panels
… an effort to improve upon the VT 2013 car, the torsional stiffness of the chassis was increased. Increasing the torsional stiffness of the chassis allows the suspension to be more precisely tuned, resulting in a better overall performance. An investigation was conducted into methods for …
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Auswirkung der Schwingstrecke und des Platten-Winkels einer Doppelplatten-Osteosynthese in einem ovinen Tibia-Defektmodell - eine Finite-Elemente-Analyse
… resulted in an 12.9 times higher shear stiffness and 39% higher torsional stiffness than the 40° configuration. Extending the plate working length of the DPO by 13 mm using longer osteosynthesis plates reduced shear stiffness by 6.3% and torsional stiffness by 17.1%. When the swing …
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Um modelo matemático para estabilidade elástica de cascas cilíndricas enrijecidas
… widely spaced discret slender elements and their torsional stiffness are taken into account. The modelling considers, in a consistent way, the coupling between all essential displacements modes - from shell and stiffeners - that occur during the non-linear response of these structures. In other …
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Experimental Measurements of Vestibular Hair Bundle Stiffness in the Red Ear Slider Turtle Utricle
… functions. In this study, the linear and torsional stiffnesses were measured for hair cells located in the red ear slider turtle utricle. The system used to measure the stiffnesses was composed of a glass whisker (attached to a pipette) used to produce a force on the tip of the bundle, an …
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Design of A Variable-Stiffness Ankle-Foot Orthosis Emulator
… with cerebral palsy. They are characterized by a torsional stiffness and ankle neutral angle. For this project, a lightweight ankle exoskeleton was designed to emulate the spring-like behavior of a traditional AFO for a wide range in torsional stiffnesses and neutral angles. This was achieved by …
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Ultra-low frequency wireless transmitter design using resonant oscillating permanent magnets
… design that uses an electrically-driven torsional resonator. In the resonator, an oscillating permanent magnet (rotor) generates the magnetic field, and additional fixed permanent magnets (stators) provide the torsional stiffness. The phenomenon of resonance helps the rotor magnet achieve …
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Design and Analysis of a Monocoque Chassis for an Electric Formula SAE Vehicle
… the applied external loads with a low-mass, high-stiffness structure. Thus far, MIT’s Formula SAE team has developed and utilized welded steel tube chassis designs for their racecars due to their relative simplicity and economy. By taking advantage of the directional stiffness of anisotropic …
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Instabilidade e sensibilidade de cascas cilíndricas circunferencialmente enrijecidas
… light and equally spaced and their bending and torsional stiffness are taken into account. A parametric study was developed and the effect of shell and ring geometric parameters on the buckling load and imperfection-sensitivity was evaluated. Theoretical predictions are compared with available …
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A mechanism for testing the torsional mechanics of origami-inspired hinges
… mathematical models and design for particular stiffness and fatigue specifications. The purpose of this study is to create a desktop machine that enables the measurement of the torsional stiffness of folded hinges over a wide angular range and a large number of cycles. This machine was then …
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Improving the concentrated solar power plant through connecting the modular parabolic solar trough
… between number of chained modules and required torsional stiffness. To verify said model, an experimental setup was designed and constructed to simulate loads due to both trough weight and wind loads.
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Development of Improved Connection Details for Voided Slab Bridges
… depths, accelerated construction times, and high torsional stiffness. The current longitudinal connection detail, a partial depth grouted shear key, has been known to fail in many of these bridges. The failure leads to reflective cracking in the wearing surface which allows chloride laden water to …
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Development of internally redundant steel box straddle caps
… and high structural performance due to the high torsional stiffness of the box. However, steel box straddle caps are classified as Fracture Critical Members, requiring stringent design, fabrication, and in-service inspections to comply with the provisions of the Fracture Control Plan. Providing …
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Aeroelastic modelling of gyroplane rotors
… of the effect of different values of torsional and flexural stiffness, and the relative chord-wise positions of blade elastic axis and centre of mass on rotor stability during autorotation. The results obtained from the model demonstrate an interesting and unique characteristic of the …
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Design of Chassis, Impact Attenuator, Suspension and Aerodynamic Systems of a Formula SAE Car
… with the aim of achieving a specific target torsional stiffness. A standard impact attenuator was analyzed using SOLIDWORKS drop test simulation with different impact absorbing materials for its crashworthiness. An optimized double wishbone suspension was designed at front and rear which was …
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Microstructurally-based constitutive models of cytoskeletal networks for simulation of the biomechanical response of biological cells
… The network model captures the initial stiffness of the network as well as the nonlinear strain stiffening observed at large stresses in shear rheological data of bundled/unbundled in vitro F-actin networks. The cytoskeletal network model has also been extended to include the internal …
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Nonlinear aeroelastic modelling of large wind turbine composite blades
… blades and thus greatly improves the accuracy of torsional stiffness calculation. It also avoids complicated post-processing of force-displacement data from computationally expensive 3D finite-element analysis (FEA) and thus considerably improves the computational efficiency. A MATLAB program was …
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