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 29 for “"spring stiffness"”.
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Lateral bracing forces in compressed two-span columns with initial curvature
… under consideration may have different bending stiffnesses in each span, and the column is subjected to an axial compressive load. The braces are not assumed to be equally spaced, and may have different spring stiffnesses. For the perfect columns, it is found that if the internal lateral support …
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Motor simulation and parameter identification in a reciprocating mechanism
… of the parameters of mass, damping, spring stiffness, and preload force of the mechanism. The time domain data (e.g. the motor net input torque, the mechanism load torque, the angular velocity, and angular acceleration, etc.) of the mechanism from a simulation can be related through …
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Gearshift Analysis for an Electric Vehicle with a Novel Synchronizer Mechanism
… during gear shifts, the Harpoon-shift torque spring stiffness in each gear is optimized via quantitative analysis. Also, the impacts of rotating inertia and speed difference on the vehicle jerks are quantitatively investigated. In addition, an experiment is conducted to study the engaging …
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Behavior of three-span braced columns with equal and unequal spans
… various initial deflections are studied. "Ideal stiffness" and "full bracing" only exist for these columns with equal spans and translational restraints with identical spring stiffness at the braces. Rotational restraints at the braces or at the ends improve the load-carrying capacity of the …
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Analytical and Numerical Approaches on the Stiffness of Magnetorheological Fluid Filled Spring
<p>A solid mechanical spring generally exhibits uniform stiffness. This thesis studies a mechanical spring filled with magnetorheological (MR) fluid to achieve controllable stiffness. The hollow spring filled with MR fluid is subjected to a controlled magnetic field in order to change the viscosity …
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Impact Mechanics Of A Lap Joint: A Theoretical-Based Parametric Study
… a loose lap joint, a beam impacting four springs with gaps is modeled. A basis analysis reveals impulse frequency responses with unique dynamic phenomena. Using steady state response, six influential parameters are studied: damping ratio, contact stiffness, position of intermediate …
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Design and Characterization of a Nonlinear Stiffening Spring for a Series-Elastic Ankle-Foot Prosthesis
… and characterization of a nonlinear stiffening spring, which acts as the elastic element of a powered transtibial prosthesis with cycloidal drive transmission. A mathematical model for angular deflection of the spring wrapping around a cylindrical surface was created, and finite-element analyses …
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Design and Characterization of Biomimetic Artificial Hair Cells in an Artificial Cochlear Environment
… as a pinned free beam with a rotational spring at the pinned end yields a rotational spring stiffness of 177*10^-6 Nm/rad. Results with 0 mV potential applied across the bilayer indicate that current generation at 0 mV likely comes from other sources besides the bilayer. Increasing the …
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Investigation of the dynamic behavior of a cable-harnessed structure
… the effect of the number of connections, of the spring stiffness of interconnections, and of mass portion of an attached cable. Damping has an important role in structural design because it reduces the dynamic response, thereby avoiding excessive deflection or stress, fatigue loads, and settling …
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3D Upper-extremity ExoNET: Improved Passive Exoskeleton for Gravity Compensation and Motor Rehabilitation
… to hardware, ensuring that parameters such as spring stiffness, anchor geometry, and routing are faithfully imple mented in the physical prototype. The modular hardware architecture enables patient specific customization, targeting specific joint movements or workspace regions. Compared to …
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The Influence of Braking System Component Design Parameters on Pedal Force and Displacement Characteristics. Simulation of a passenger car brake system, focusing on the prediction of brake pedal force and displacement based on the system components and their design characteristics.
… critical parameter of brake booster air valve spring stiffness was identified to improve the brake ‘pedal ‘feel’. This research has contributed to the advancement of automotive engineering by providing a method for brake system engineers to design a braking system with improved pedal ‘feel’. …
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Equilibria of a Gyrostat with a Discrete Damper
… the relative equilibria of a gyrostat with a spring-mass-dashpot damper to gain new insights into the dynamics of spin-stabilized satellites. The equations of motion are developed using a Newton-Euler approach, resulting in equations in terms of system momenta and damper variables. Linear and …
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Uncertainty analysis of disc brake squeal propensity
… analysis. By incorporating uncertainties in the spring stiffness and friction coefficient, the under-prediction of the CEA has been significantly reduced although it increases with the strength of the nonlinearity. The friction oscillator is then extended to interconnected 3×3 friction …
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Analysis of shallow and deep foundations using soil-structure interaction techniques
… supporting soil is modelled using a discrete spring representation as in the simplified subgrade reaction theory (S.S.R.T.). The idealized model is analysed using a standard structural program. Relationships are developed between spring stiffness values and soil moduli for a range of axially …
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A LIGO Double Pendulum Suspension Prototype for Reducing Unwanted Cross-Couplings
… a combination of the wire attachment point and spring stiffness. The resonance can be moved around by changing these factors. This project has two main components. The first is a state space model that describes the equations of motion for the double pendulum and is used to predict dynamic …
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Response of continuous pipelines to tunnel induced ground deformations
… approximations for the vertical and horizontal spring stiffness coefficients in the Winkler models are interpreted from numerical finite element analyses. The proposed analyses are compared with prior solutions proposed by Vorster (2005) and Klar et al. (2005) that rely on empirical procedures …
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ATOMISTIC MODELING OF PHONON BANDSTRUCTURE AND TRANSPORT FOR OPTIMAL THERMAL MANAGEMENT IN NANOSCALE DEVICES
… of lattice waves, effect of strain on spring stiffness, and accurate phonon-phonon interaction. To circumvent this problem, in this work, a coupled molecular mechanics-Monte Carlo (MM-MC) platform has been developed and used to solve the phonon Boltzmann Transport Equation (BTE) for the …
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Vibratory conveyors
… for reducing this effect by re-tuning the bowl spring support system is demonstrated. Some suggestions for improving the performance of conventional bowl feeders are discussed which include details of how the track angle, vibration. angle, track material and suspension spring stiffness should be …
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Experimental and theoretical analysis of boltless semi-rigid connectors
… global model was later modified to incorporate spring stiffness values. Two global models were used to investigate the effect of variation in the number and direction of restraints and the incorporated springs. For every case the beam end connector stiffness value was evaluated and was compared …
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Efficient techniques for soft tissue modeling and simulation
… and ChainMail, we have implemented a mass spring system because of its acceptable accuracy and speed. Mass spring systems have, however, some drawbacks such as, the determination of simulation coefficients with their iterative nature. Given the correct parameters, mass spring systems can …
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