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.
Results
Showing 1 to 20 of 20 for “"linearization method"”.
-
Robustness studies of the feedback linearization method
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
-
Solving Nonlinear Aeronautical Problems Using the Carleman Linearization Method
… nontrivial. This thesis will apply the Carleman linearization technique to three model problems: a two-degree of-freedom (2DOF) ballistic trajectory, Blasius' boundary layer, and Van der Pol's equation and evaluate how well the technique can adequately approximate the solutions of these ordinary …
-
Modeling of nonstationary earthquake ground motion and biaxial and torsional response of inelastic structures
… content are functions of time. Corresponding methods for estimating the model parameters based on actual earthquake records are also given. The proposed ground motion model can be efficiently applied to simulations as well as analytical solutions of random vibration and reliability studies for …
-
Random Vibration Analysis of Higher-Order Nonlinear Beams and Composite Plates with Applications of ARMA Models
… response. A new linearly coupled equivalent linearization method is proposed and compared with the widely used traditional equivalent linearization method. The new method is proven to yield closer predictions to the numerical simulation results of the nonlinear beam vibration. A systematical …
-
Model order reduction for nonlinear systems
This thesis presents some practical methods for doing model order reduction for a general type of nonlinear systems. Based on quadratic or even higher degree approximation and tensor reduction with assistance of Arnoldi type projection, we demonstrate a much better accuracy for the reduced …
-
Optimal orbit transfers for satellite formation flying applications
… Third, the dissertation presented an analytic linearization method, termed the “primer vector approximation method,” for solving nonlinear continuous-thrust trajectory optimization problems.
-
A Numerical Study of Unsteady Natural Convection in a Rectangular Enclosure -- The Effect of Variable Thermodynamic and Transport Properties
… derivatives and then linearized using Newton's linearization method. The resulting set of algebraic equations is solved using the Coupled Modified Strongly Implicit Procedure for the unknowns of the problem. The results of this study show that the variable property model predicts lower values …
-
Predicting the Effects of Dimensional and Material Property Variations in Micro Compliant Mechanisms
… existing tolerance and uncertainty analysis methods to apply to micro compliant mechanisms. For simple compliant members, explicit equations can be used in uncertainty analysis. However, for a nonlinear implicit system of equations, the direct linearization method may be used to obtain …
-
Recent numerical techniques for differential equations arising in fluid flow problems
… numerical techniques, namely the spectral quasi-linearization method (SQLM) and the bivariate spectral quasi-linearization method (BSQLM), in solving problems arising in fluid flow. Firstly, we use the SQLM to solve the highly non-linear one dimensional Bratu problem. The results obtained are …
-
Stochastic finite element analyses of uncertain nonlinear plane trusses under random excitations
A method of stochastic finite element analysis is developed in this study to solve for the response statistics and reliability of nonlinear truss structures with uncertain system parameters under random excitations. Emphasis is on structural nonlinear behavior due to both large deflection and …
-
OPTIMAL CONTROL DESIGN FOR POLYNOMIAL NONLINEAR SYSTEMS USING SUM OF SQUARES TECHNIQUE WITH GUARANTEED LOCAL OPTIMALITY
… local optimal control is found by using the linearization method and solving the Algebraic Riccati equation with respect to the quadratic part of a given performance index. Next, we utilize the density function method to find a globally stabilizing polynomial nonlinear control for the …
-
Computational analysis of magnetohydrodynamics boundary layer flow of nanofluid over a stretching sheet in the presence of heat generation or absorption and chemical reaction
… are then solved numerically using spectral local linearization and spectral relaxation methods. The effects of different parameters, Lewis number, Eckert number, stretching, chemical reaction, local Reynolds number, Prandtl number, constant, heat source, Brownian motion, and Thermophoresis are …
-
Vibration isolation systems using hysteretic multiple tuned mass damper oscillators
… the computational intensive Monte Carlo method. Further, statistical linearization of the hysteretic system is conducted. The agreement of the statistics of the nonlinear system response computed by the Monte Carlo method with those computed by the statistical linearization method enables …
-
Neural Network Fatigue Life Prediction in Steel I-Beams Using Mathematically Modeled Acoustic Emission Data
… which are mathematically modeled using three methods of bounded Johnson distribution (Slifker and Shapiro, Mage and Linearization) and Weibull distribution. Currently, the best method is the Linearization method that has prediction error not more than 17%. Multiple linear regression (MLR) …
-
New Models for Crowd Dynamics and Control
… control design that synthesizes the feedback linearization method for the one-dimensional traffic flow problem applied directly on the distributed parameter system. In addition, we suggest and discuss the information technology requirements for an evacuation system. This research was supported …
-
Modeling of HIV, SIR and SIS epidemics on time scales and oscillation theory
… and global stability of equilibria by the linearization method and constructing a suitable Lyapunov function.</p> <p>In all the work above, we show the applications of positive solutions of higher dimensional systems in epidemiology. Finally, we investigate four dimensional dynamic systems, …
-
Establishing A Quantitative Foundation for Exactly Constrained Design
… constrained (EC) design is a robust design method which can be used for mechanical assemblies. It entails using the minimum number of constraints to eliminate all desired motion. <p>While found by some engineers in industry to have many benefits (including robust assembly, no binding or …
-
Lignin acrylate derivatives and their behaviors in free radical copolymerizations
… ratios were computed by use of the Fineman-Ross linearization method, by the KelenTudos equation and by the Yezrielev-Brokhina-Roskin (YBR) numerical method. A comprehensive analysis with respect to the methods used to derive the ratios has shown that the Kelen-Tudos method and the YBR method …
-
Synergistic design of a combined floating wind turbine - wave energy converter
… simulations. This thesis develops a statistical linearization approach to rapidly compute machine dynamics statistics while accounting for nonlinearities in the frequency domain. It is verified that the statistical linearization method may capture significant dynamics effects that are neglected …
-
Vereinfachte Methoden zur optimalen Regelung resonanter Leistungskonverter
… points of power supplies. Also, with new control methods and new ways of manufacturing, for example, the cost per unit might be reduced. Also, a simplified control concept might help to avoid discrete circuits, especially, at low power levels. The last mentioned statement is demonstrated, for …