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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 40 for “"State Equations"”.
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Algebraic Generation and Active Network Realization of State Equations
Made available in DSpace on 2014-12-08T22:24:00Z (GMT). No. of bitstreams: 1 6612378.pdf: 1425235 bytes, checksum: cd3c11cdcd8ea967ebcffc4e4ef7da1b (MD5) Previous issue date: 1966
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Computer aided analysis of electric circuits using state-variable techniques.
… main tasks that a computer program based on state-variable analysis must perform: 1) formulation of a degenerate system of equations; 2) processing of these equations until they eventually become the state equations; 3) the solution of the state equations. The first task requires the …
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Nitrification and denitrification kinetics in the activated sludge process
… extension describing the behaviour in the anoxic state required no change in the basic equations describing the aerobic state. The numerical values of the kinetic constants in the anoxic state equations were found to be the same as those in the aerobic state equations, except for one: The value of …
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Modeling, Discontinuous Galerkin Approximation and Simulation of the 1-D Compressible Navier Stokes Equations
In this thesis we derive time dependent equations that govern the physics of a thermal fluid flowing through a one dimensional pipe. We begin with the conservation laws described by the 3D compressible Navier Stokes equations. This model includes all residual terms resulting from the 1D flow …
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Model-agnostic Methodology for High-Altitude Balloon Mission Planning
… a novel model-agnostic set of probabilistic state equations for floating latex high-altitude balloon flights. Individual latex flights have been proven to closely match with the two commonly used sets of latex balloon dynamics, but a large scale analysis of simulation vertical and horizontal …
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Generalised Markovian analysis of timed transition systems
… onto a Markov chain through a process known as state space generation. The Markov chain thus generated can then be solved for its steady-state distribution by numerically determining the solution to a large set of sparse linear equations known as the steady-state equations. Existing techniques …
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Small signal analysis of nonlinear systems with periodic operating trajectories
… using the COSMIR program to solve for the state equations and for steady-state, making a general power supply simulation program.
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A Unified Technique for Dynamic Modeling and Stability Analysis of Microgrid Systems
… of microgrid power systems. Using the automated state-model generation algorithm, a state-space model of the microgrid power system is derived. The model may be used to conduct time-domain simulations and analyze system response to large transients. Additionally, eigenvalues of the system may be …
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Poluição de águas subterrâneas: seleção de um modelo matemático de dispersão bidimensional
… groundwater pollution may be done by a set of equations which includes two continuity equations, one for the mixture water and pollutant (flow equation) and other only for the pollutant (mass-transport equation), Darcy's equation and state equations for the mixture. Complex boundary conditions …
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Indoor Concentration Simulation of Radon Isotopes and Their Decay Products
… deposition, and resuspension. Steady-state and time-dependent equations, derived by Thompson, were used to evaluate the relative effects of these variables on the potential alpha energy concentraiton (PAEC). Steady-state equations showed that at higher ventilation rates PAEC reduction …
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A new numerical optimization method based on Taylor series for challenging trajectory optimization problems
… programming. In direct transcription the system equations must be converted into algebraic constraints. Existing methods use only zeroth and first order derivatives of the system equations to formulate these constraints. The techniques of automatic differentiation allow the computation of the …
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Dynamics and control of spacecraft with retargeting flexible antennas
… The dissertation contains the derivation of the equations of motion by a Lagrangian approach using quasi-coordinates, as well as a procedure for designing the feedback controls. Assuming that antennas are flexible, distributed parameter members, the state equations of motion are hybrid. Moreover, …
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Numerical Solution Techniques for Reaction Parameter Sensitivity Coefficients in Multicomponent Subsurface Transport Models
For reactive transport, the state equations consist of a nonlinear PDE for each aqueous component and a nonlinear ODE for each immobile component; these differential equations are coupled together through reaction source/sink terms. The corresponding sensitivity equations take the form of a system …
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Reduced-order modeling of MEMS using modal basis functions
… few degrees of freedom (DOF), and a small set of state equations. Our process for constructing macromodels is built upon two well-established methodologies - normal mode superposition and Lagrangian mechanics. This is referred to as the "CHURN process" and was originally developed by Gabbay et al. …
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A "HUM" conjugate gradient algorithm for constrained nonlinear optimal control : terminal and regular problems
… be quantified as a total cost functional of the state and control histories. Problems stated in such a manner are not required to follow an exact desired behavior, alleviating potential controllability issues. We present a method for solving large deterministic optimal control problems defined by …
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A model-following digital control law for an EBF-STOL aircraft
… the control loop around each of the plant states while the feedforward gains multiply the states of the inputs to some desirable reference model, thus making it a prefilter to the plant. The model chosen for this research is that of a B-26 aircraft. The longitudinal equations of motion of …
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Concrete at high temperatures: hygro-thermo-mechanical degradation of concrete
… of the slip flow effect is included and several state equations, including relative permeability and saturation vapour pressure, are adopted. Additionally, the effect of polypropylene fibres as a spalling prevention technique is modelled via a modification of the intrinsic permeability …
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On the Application of Machine Learning and Physical Modeling Theory to Causal Lifting Linearizations of Nonlinear Dynamical Systems with Exogenous Input and Control
… system, called observables, may be functions of state and input, Φ(x,u). These input-dependent observables cannot be used for lifting the system, because the state equations in the augmented space contain the time derivatives of input, hence anti-causal. Furthermore, finding effective observable …
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Power System Stability Improvement with Decommissioned Synchronous Machine Using Koopman Operator Based Model Predictive Control
… setting, for power utilities, the detailed state equations of such device as well as the complicated nonlinear power system are usually unobtainable making the controller design a challenging problem. Therefore, a model free, purely data-driven strategy for the nonlinear controller design …
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Output Impedance Modeling and Measurement of a 28 kW Synchronous Generator
… SM. Starting from formulating the SM's abc frame equations, a d-q transformation is done based on the SM rotor frame so that the inductance from the abc frame representation will be fixed. Then, the SM's fundamental parameters are obtained from standstill frequency response testing. In the …
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