# Analog Electronic Simulations of a Nonlinear System

*We perform electronic analog simulations of a harmonically forced Duffing oscillator. The addition of noise perturbations of sufficient intensity is shown to induce transitions between...*

A Sphere Moving Down an Inclined Bumpy Surface

*A sphere moving down a bumpy incline in the air is studied theoretically and experimentally. A method based on the principle of energy conservation is used to express the average velocity...*

Structural Control Under Stochastic Seismic Loads

*This paper presents a method of controlling nonlinear and hysteretic civil engineering structures subjected to stochastic earthquake ground excitations. Emphasis is placed on control of...*

Reduced Basis Technique for Nonlinear Vibrations of Composite Panels

*A reduced basis technique and a computational procedure are developed for the nonlinear free vibrations of composite panels. The computational procedure can be conveniently divided into...*

Roll-Waves on a Non-Newtonian Mud Layer

*This article extends the theory of roll-waves due to Dressler (1949) to a thin layer of mud modeled as a power law fluid. Roll-waves are periodic bores moving at a constant velocity down...*

Inflation Instability of Cylindrical Membranes

*A new procedure which investigates inflation instability of cylindrical nonlinear membranes is developed. The general characteristics of inflation instability are described. An efficient...*

Stochastic Finite and Boundary Elements

*The random coefficients in partial differential equations, which govern the responses of stochastic thermo-mechanical systems, (Dasgupta, 1991), pose a computational challenge. The large...*

Investigation of Parametrically-Induced Excitation in Concrete Columns

*A mathematical model is developed which accounts for the non-linear material characteristic of concrete members. The axial and transverse motions of concrete columns, are found to be second-order...*

Minimal Storage Finite Element Solution of Large-Scale Three-Dimensional Elastodynamic Problems

Tripod Crane Concept for Lunar Surface Construction

*A construction scheme using three integrated cranes is proposed. Mikulas proposed a lunar crane concept which introduces a set of three cables in order to stabilize the payload. This paper...*

Tide and Hurricane Storm Surge Computations for the Western North Atlantic and Gulf of Mexico

*The development of a finite element (FE) model to study tides and hurricane storm surge in the Western North Atlantic and Gulf of Mexico is discussed. Issues that are emphasized include...*

Approximation of Convective Processes by Cyclic AOI Methods

*Convective or advective processes play a role in many models for civil engineering applications. For example in transport equations, in hydrodynamic equations or wave energy equations....*

Linearisation and Offshore Fatigue Reliability

*In determining the force effects due to wave action on offshore structures it is conventional to use an equivalent linearisation to convert wave velocities to forces via Morison's equation....*

Asymptotic Importance Sampling

*One of the main issues in reliability analysis is the accurate and efficient calculation of the multivariate reliability integral. The Asymptotic Importance Sampling Technique (AIS) selects...*

Pre-Envelope Covariance Differential Equations

*The problem of predicting the safety of structural systems subjected to random loading arises in may engineering applications. In this framework the envelope process plays an important...*

Experiences with Experimental Design Schemes for Failure Surface Estimation and Reliability

*When using FORM and SORM to predict the probability of failure for a structural component a model for the failure function has to exist. For certain structural components a mechanical...*

Digital Simulation of Wind Load Effects

*The time domain solution of the equations of motion of structures subjected to a stochastic wind field is often obtained by a step-by-step integration approach. The loading is often described...*

Reliability Analysis of Degrading Elasto-Plastic Oscillators

*A method is developed for calculating the probability (reliability) that the total plastic displacement of an elasto-plastic oscillator does not exceed a critical level during a reference...*

A Stochastic Model for Crack Initiation and Fatigue Life

*A stochastic theory of high cycle fatigue life is based on a combination of the theory of diffusion in the presence of a stress field with activated state theory. The result is expressed...*

A Stochastic Approach to the Fatigue Reliability

*In this paper, the stochastic approach, which combines the mixed boundary integral equation method (Lua et al (1992a)) with the First Order Reliability Method (FORM), is applied to study...*

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