We introduce the concept of fruitful regions in a dynamic routing context: regions that have a high potential of generating loads to be transported. The objective is to maximise the number of loads transported, while keeping to capacity and time constraints. Loads arrive while the problem is being solved, which makes it a real-time routing problem. The solver is a self-adaptive evolutionary alg...

This article aims to study the self-supporting truss towers used to support large wind turbines. The goal is to evaluate and validate numerically by finite element method the structural analysis when the lattice structures of the towers of wind turbines are subjected to static loads and these from common usage. With this, it is expected to minimize the cost of transportation and installation of...

Article history: Received 14 May 2009 Received in revised form 23 February 2010 Accepted 7 June 2010

This paper deals with the development of a model for concrete subjected to dynamic loads. Shock waves are generated by Pulsed Arc Electro-hydraulic Discharges (PAED) in water and applied to mortar samples. A diphasic model (liquid water and vapour) is implemented in order to describe the electrical discharge and the propagation of shock waves in water. An anisotropic damage model is devised, wh...

The aim of this paper is to investigate the dynamic response of long span cable-stayed bridges subjected to moving loads. The analysis is based on a continuum model of the bridge, in which the stay spacing is assumed to be small in comparison with the whole bridge length. As a consequence, the interaction forces between the girder, towers and cable system are described by means of continuous di...

A series of treated and untreated laminated Douglas fir beams and plywood panels were subjected to static and dynamic loads to study the effects of pressureimpregnation with fire-retardant chemicals on the mechanical properties of wood and to extend the existing knowledge cf the dynamic properties of wood. Results from the beam tests indicate that designs should be based on use under wet condit...

While probabilistic methods have been applied extensively to quantify uncertainty of sea environments and estimate reliability of naval vessels under normal seaway loads, their extension to surface ships subjected to extreme dynamic loads due to collision, grounding, and weapon effects has not been well explored. Under these extreme loads, the structural response behaves nonlinearly. In additio...

Several topology optimization problems are conducted within the ribs and spars of a wing box. It is desired to locate the best position of lightening holes, truss/cross-bracing, etc. A variety of aeroelastic metrics are isolated for each of these problems: elastic wing compliance under trim loads and taxi loads, stress distribution, and crushing loads. Aileron effectiveness under a constant rol...

Approved: _____________________________________ Thesis Supervisor _____________________________________ Title and Department _____________________________________ Date A STUDY OF ALTERNATIVE FORMULATIONS FOR OPTIMIZATION OF STRUCTURAL AND MECHANICAL SYSTEMS SUBJECTED TO STATIC AND DYNAMIC LOADS

Single-phase induction machines are found in various appliances such as refrigerators, washing machines, driers, air conditioners, and fans. Large concentrations of single-phase induction motor loads such as air conditioners and other motorcompressor loads can adversely impact the dynamic performance of a power system. An understanding of the dynamics of this type of induction machine is needed...