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Now showing items 1-10 of 149

#### Structural Optimization in a Distributed Computing Environment

(1991)

This report presents the formulation and testing of a Feasible Sequential Quadratic Programming (FSQP-DIS) optimization algorithm customized to a Distributed Numerical Computing environment (DNC). DNC utilizes networking ...

#### A Note on the Positive Definiteness of BFGS Update in Constrained Optimization

(1990)

This note reviews a few existing methods to maintain the positive definiteness of BFGS in constrained optimization, and their impacts on both global and local convergence. The boundedness of the matrix from above is also ...

#### Solid Modeling of Reinforced Concrete Beams, Part I: Data Structures and Algorithms, Part II: Computational Environment

(1991)

This 2-part paper describes a solid modeling methodology for the interactive design and analysis of reinforced concrete (RC) beam structures. Part I covers the data structure and algorithms for steel reinforcing bar ...

#### Asymptotic Stability of Nonlinear Systems with Holomorphic Structure

(1990)

We consider the local asymptotic stability of a system dx/dt = F(z), z = C sup n , F : C sup n - C sup n is holomorphic, t R, and show that if the system is locally asymptotically stable at some equilibrium point in the ...

#### On the Redundant-Drive Backlash-Free Robotic Mechanisms

(1990)

In this paper, we introduce a new and innovative concept for the control of backlash in gear-coupled robotic mechanisms. The concept utilizes redundant unidirectional drives to assure positive coupling of gear meshes at ...

#### Robust Stability via the Guardian Map Approach: A Perspective

(1990)

Guardian and semiguardian maps were recently introduced as tools for investigating generalized stability of parametrized families of matrices and of polynomials. Here we give a brief survey of the motivation and scope of ...

#### Nonlinear Stabilization of High Angle-of-Attack Flight Dynamics Using Bifurcation Control

(1990)

We consider the problem of designing stabilizing control laws for flight over a broad range of angles-of-attack which also serve to signal the pilot of impending stall. The paper employs bifurcation stabilization coupled ...

#### On the Computation of the Real Stability Radius

(1993)

Recently, Qiu et al. obtained a computationally attractive formula for the computation of the real stability radius. This formula involves a global maximization over frequency. Here we show that the frequency range can be ...

#### Kinematic Synthesis and Analysis of a Novel Class of Six-DOF Parallel Minimanipulators

(1993)

A new class of six-degree-of-freedom (six-DOF) parallel minimanipulators is introduced. The minimanipulators are designed to provide high resolution and high stiffness in fine- manipulation operations. Two-DOF planar ...

#### Local Nonlinear Control of Stall Inception in Axial Flow Compressors

(1993)

A combination of theoretical and computational nonlinear analysis techniques are used to study the scenario of bifurcations responsible for the initiation of rotating stall in an axial flow compressor model. It is found ...