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DSpace at MIT (28.968 recursos)
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Mostrando recursos 1 - 20 de 87

1. Applications of Proper Orthogonal Decomposition for Inviscid Transonic Aerodynamics - Tan, Bui-Thanh; Willcox, Karen E.; Damodaran, Murali
Two extensions to the proper orthogonal decomposition (POD) technique are considered for steady transonic aerodynamic applications.

2. Bubble Simulation Using Level Set-Boundary Element Method - Tan, Kiok Lim; Khoo, Boo Cheong; White, Jacob K.
In bubble dynamics, an underwater bubble may evolve from being singly-connected to being toroidal.

3. Characterizing Scattering by 3-D Arbitrarily Shaped Homogeneous Dielectric Objects Using Fast Multipole Method - Li, Jian-Ying; Li, Le-Wei
In the analysis, the method of moments is first employed to solve the combined field integral equation for scattering properties of these three-dimensional homogeneous dielectric objects of arbitrary shape.

4. A Comparative Study on Optimization of Constrained Layer Damping for Vibration Control of Beams - Pau, G.S.H.; Zheng, H.; Liu, Guirong
layout to minimize the maximum vibration response of the odd modes, which constitutes the dominant acoustic radiation, of a simply-supported beam excited by a harmonic transverse force.

5. Computing Bounds for Linear Functionals of Exact Weak Solutions to Poissonâ??s Equation - Sauer-Budge, A.M.; Huerta, A.; Bonet, J.; Peraire, Jaime
We present a method for Poissonâ??s equation that computes guaranteed upper and lower bounds for the values of linear functional outputs of the exact weak solution of the infinite dimensional continuum problem using traditional finite element approximations.

6. Data Smoothing: Research 2002 - Strang, Gilbert
This paper will appear in the book Mathematical Systems Theory (J.

7. Effect of Column Inlet and Outlet Geometry on Large-scale HPLC - Tan, S.N.; Khoo, Boo Cheong
The separating characteristics of high performance liquid chromatography (HPLC) columns, measured in terms of the height equivalent of a theoretical plate (HETP) and skewness of the eluted peak, are investigated using computational fluid dynamics (CFD).

8. Generalized Stationary Points and an Interior Point Method for MPEC - Liu, Xinwei; Sun, Jie
Some generalized stationary points of MPEC are studied to better describe the limiting points produced by interior point methods for MPEC.A primal-dual interior point method is then proposed, which solves a sequence of relaxed barrier problems derived from MPEC.

9. Model reduction for active control design using multiple-point Arnoldi methods - Lassaux, G.; Willcox, Karen E.
By choosing the number of frequency interpolation points and the number of Arnoldi vectors at each frequency point, the user can select the accuracy and range of validity of the resulting reduced-order model while balancing computational expense.

10. Multiparameter Moment Matching Model Reduction Approach for Generating Geometrically Parameterized Interconnect Performance Models - Daniel, Luca; Ong, Chin Siong; Low, Sok Chay; Lee, Kwok Hong; White, Jacob K.
The effectiveness of the technique is tested using a multi-line bus example, where both wire spacing and wire width are considered as geometric parameters.

11. Nonsmooth Newtonâ??s Method and Semidefinite Optimization - Sun, Jie
We introduce basic ideas of a nonsmooth Newtonâ??s method and its application in solving semidefinite optimization (SDO) problems.

12. Optimization of Passive Constrained Layer Damping Treatments for Vibration Control of Cylindrical Shells - Zheng, H.; Pau, G.S.H.; Liu, Guirong
This paper presents the layout optimization of passive constrained layer damping (PCLD) treatment for vibration control of cylindrical shells under a broadband force excitation.

13. Real-Time Optimal Parametric Design of a Simple Infiltration-Evaporation Model Using the Assess-Predict-Optimize (APO) Strategy - Ali, S.; Damodaran, Murali; Patera, Anthony T.
Optimal parametric design of a system must be able to respond quickly to short term needs as well as long term conditions.

14. Reliable Real-Time Optimization of Nonconvex Systems Described by Parametrized Partial Differential Equations - Oliveira, I.B.; Patera, Anthony T.
The solution of a single optimization problem often requires computationally-demanding evaluations; this is especially true in optimal design of engineering components and systems described by partial differential equations.

15. Robust Discrete Optimization - Bertsimas, Dimitris J.; Sim, Melvyn
We propose an approach to address data uncertainty for discrete optimization problems that allows controlling the degree of conservatism of the solution, and is computationally tractable both practically and theoretically.

16. Statistical Error in Particle Simulations of Fluid Flow and Heat Transfer - Hadjiconstantinou, Nicolas G.; Garcia, Alejandro L.; Bazant, Martin Z.; He, Gang
Expressions for the common hydrodynamic variables of interest such as flow velocity, temperature, density, pressure, shear stress and heat flux are derived using equilibrium statistical mechanics.

17. Structural Topology Optimization Using a Genetic Algorithm and a Morphological Representation of Geometry - Tai, Kang; Wang, Shengyin; Akhtar, Shamim; Prasad, Jitendra
This paper describes an intuitive way of defining geometry design variables for solving structural topology optimization problems using a genetic algorithm (GA).

18. Summary Conclusions on Computational Experience and the Explanatory Value of Condition Measures for Linear Optimization* - Ordóñez, Fernando; Freund, Robert M.
The modern theory of condition measures for convex optimization problems was initially developed for convex problems in conic format, and several aspects of the theory have now been extended to handle non-conic formats as well.

19. Aerodynamic Shape Design of Transonic Airfoils Using Hybrid Optimization Techniques and CFD - Xing, X.Q.; Damodaran, Murali; Teo, Chung Piaw
Previous studies on this topic by the authors had examined the application of deterministic optimization methods and stochastic optimization methods such as Simulated Annealing and Simultaneous Perturbation Stochastic Analysis (SPSA).

20. Fast Methods for Bimolecular Charge Optimization - Bardhan, Jaydeep P.; Lee, J.H.; Kuo, Shihhsien; Altman, Michael D.; Tidor, Bruce; White, Jacob K.
We report a Hessian-implicit optimization method to quickly solve the charge optimization problem over protein molecules: given a ligand and its complex with a receptor, determine the ligand charge distribution that minimizes the electrostatic free energy of binding.

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