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 50 for “"mass model"”.
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Optimal and on-board near-optimal midcourse guidance
… propulsion. A vertical plane, point-mass model is studied with load factor as a control variable. Time-range-energy optimal trajectories are computed, open-loop, via the usual necessary conditions and a multiple-shooting algorithm. A requirement on terminal velocity magnitude is …
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Determination of axial load and support stiffness of continuous beams by vibration analysis
Three models are presented which predict frequencies and mode shapes of transverse vibration for a continuous prismatic Bernoulli-Euler beam on elastic supports, subjected to a compressive axial load. The first model, which approximates support stiffnesses by an equivalent elastic foundation, is …
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Backpack Energy Harvester with Human Walking Model
… backpack energy harvester for human walking. To model human walking with backpack energy harvester, a simple dual-mass model has been developed and studied first. Dual-mass model for three types of distinct harvesters were investigated, pure damping, traditional rack pinion energy harvester and …
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Eulerian-Eulerian Modeling of Fluidized Beds
… enhanced mixing characteristics. Computational modeling of fluidized bed hydrodynamics is a significant challenge that has to be tackled for increasing predictive accuracy. The distributor plate of a fluidized bed is typically modeled using a uniform inlet condition, when in reality the inlet is …
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The anisotropy of the upper critical field of chevrel phase compounds
… (001) plane. The data were fit to the effective mass model with uniaxial symmetry. A two-fold symmetry was observed in the Cu1.sMo6S8 in the (2TO) plane. Oscillations with three-fold symmetry have been observed for the first time in the (001) plane. The effective mass model was unable to explain …
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Structure-function relationship in hierarchical model of brain networks
… network of cat cortical connectivity. We model the cortical areas by a subnetwork of interacting excitable neurons (multilevel model) and by a neural mass model (population model). With weak couplings, the multilevel model displays biologically plausible dynamics and the synchronization …
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Aircraft agility
… developed based on the notion of a new dynamic model for aircraft motions. This model may be viewed as intermediate between a point-mass model, in which the body attitude angles are control-like, and a rigid-body model, in which the body attitude angles evolve according to Newton's Laws. …
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Analytical and Numerical Optimal Motion Planning for an Underwater Glider
… Instead they change their buoyancy and center of mass location to control attitude and trajectory. The vehicles spend most of their time in long, steady glides, so even minor improvements in glide range can be magnified over multiple dives. This dissertation presents a rigid-body dynamic system …
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Segmented Mirror Telescope model and simulation
… modal controller for a simple spring-mass model of a deformable mirror surface is provided by this thesis. This technique avoids more difficult time-domain solutions, is computationally efficient and scalable to much larger multi-input, multi-output systems than the SMT.
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Development and validation of a single mass Lap simulation
In this thesis, a single mass model lap time simulation was designed, implemented and validated in MATLAB. The goal of this simulation was to accurately predict the velocity of a formula style open wheeled race car on a given track. The simulation was constructed in MATLAB, and features a function …
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A Comparative Study Between 6 Degree-of-Freedom Trajectory Model and Modified Point Mass Trajectory Model of Spinning Projectiles
… spinning projectiles, the 6 Degree-of-Freedom model can closely capture their trajectories with high accuracy and details. However, it comes with the drawbacks of long computation time and needing many aerodynamic coefficients which can be hard to obtain. The Modified Point Mass Trajectory …
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Frequency-based response of damped outrigger systems for tall buildings
… By constructing an 80-dof discrete lumped mass model, and using a frequency-based response approach, two configurations of dampers, namely series and parallel damping are studied in detail. The effect of increasing damper size to overall achievable building damping is monitored for both …
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Chimeric Thrombomodulin and CD47 proteins synergistically improve the engraftment of islets by mitigating IBMIR
… from contributing to islet engraftment in a model of syngeneic marginal mass islet transplantation. Islet-blood interaction initiates IBMIR consisting of activation of the coagulation and complement systems and recruitment of myeloid cells, resulting in most initial graft loss. TM is an …
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Dynamic modeling of a robotic spacecraft for NASA’s asteroid redirect robotic mission
… presents a detailed analysis of the dynamic modeling of the ARRM spacecraft grasping the boulder. This model is used for three-axis attitude control design and simulation of the system. This thesis presents a 30 degree-of-freedom nonlinear lumped-mass model for the structural dynamics of the …
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A study of aircraft agility
Two mathematical models are applied to the study of a flight performance problem for an air-superiority fighter aircraft. The first model considers the body axes angular rates as control variables and is accordingly referred to as the body rate model. The second model is a rigid body model …
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Cantilever Dynamic Analysis in Tapping Mode Atomic Force Microscopy
… to phase shifts in tapping mode AFM using point-mass model. Results showed that the phase shift is independent of the Young’s modulus of the material; the phase shift only changes when energy dissipation occurs, such as the case with adhesion hysteresis and viscosity. However, the simple point …
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Analysis and control of marine cable systems
… An alternative approach based upon a lumped mass model is developed. Mathematical analysis reveals many interesting characteristics of the model. By applying modern control theory, a novel heave compensation mechanism is developed for marine systems of cables and subsea units. This mechanism …
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First on-line mass measurements at SHIPTRAP and mass determinations of neutron-rich Fr and Ra isotopes at ISOLTRAP
… by SHIP. The current set-up for high-precision mass measurements consists of three main functional parts: (i) a gas cell for stopping the energetic ions from SHIP, (ii) radiofrequency quadrupole structures to cool and to bunch the ions extracted from the gas cell, and (iii) a superconducting …
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Development of spintronics devices and Type 1 heterojunctions from graphene nanoribbon superlattices
… could be predicted from a simple 1D effective mass model, or devices with localized magnetism at the interface sites with potential applications in spintronics. For devices with magnetic interfaces, we show the possibility of forming ferrimagnetic and anti-ferromagnetic materials systems and …
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Terminal transient for minimum-time dash mission
… is studied using both a reduced-order "energy" model formulation and a point-mass model formulation of the aircraft. The mission is confined to vertical plane maneuvers, and is defined as consisting of three stages; a climb to the dash point,a steady-state dash at the high velocity point, and …
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