No description available.

No description available.

This diploma thesis deals with computer simulation. In the opening, there are descriptions of theoretical aspect of computer simulation, simulation model structure and individual phases of simulation process. After that follow areas of application, characteristic features of each area and classification of simulation models, that are used in those areas. In this thesis only 4 areas of application were chosen: automotive industry, logistics and transportation systems, healthcare and military simulation. Each application area contains descriptions of a few chosen simulation software products that are used in this area. At the close there is a price comparison of described simulation products, their usage in Czech Republic and their development evaluation.

Zugl.: Cottbus, Techn. Universiẗat, Diss., 2008.

No description available.

No description available.

CFD-Analysen sind in den letzten Jahren ein fester Bestandteil in der Produktentwicklung geworden. Dies liegt primär daran, dass es in den letzten Jahrzehnten große Fortschritte in der Entwicklung der Software und dem Preisverfall der Hardware gegeben hat. Das einstige Expertenwerkzeug CFD hat heutzutage auch in vielen kleinen und mittelständischen Unternehmen seinen festen Platz gefunden und somit ein enormes Anwendungsspektrum erschlossen. Ein wesentlicher Schlüssel für diesen Erfolg war und ist die Effizienz bei der Erstellung der Berechnungsmodelle. Ein Meilenstein war die ab Mitte der 1990er Jahre verfügbare Verwendung unstrukturierter Netze. Erst durch den Einsatz von Tetraedern konnten beliebig komplexe Strukturen überhaupt vernetzt werden. Dieser Vortrag beschreibt die Verwendung von sogenannten kartesischen Netzen in Kombination mit der Immersed Boundary Methode. Dabei handelt es sich um einen bislang wenig beachteten Weg, der den Anwender nochmals erheblich bei der Modellaufbereitung entlastet und somit auch anspruchsvolle CFD-und Thermalsimulationen für Konstrukteure zugänglich macht.

Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniv. / Härtill 5 uppsatser.

PTC Creo strives to provide users with a fully integrated analysis tool which aids in the steps of product development. It includes real-time design guidance from the earliest concepts with “Creo Simulation Live”, high fidelity simulation tailored to the Creo User with “Creo ANSYS Simulation”, “Creo Simulate” and “Creo Simulate Advanced”, a means of autonomously creating designs tailored to the requirements with “Cre Generative Solutions” and flow and particle simulation with “Creo Flow Analysis”.

“Hardware in the Loop” (HIL) testing is widely used in the automotive industry. The sophisticated electronic control units used for vehicle control are usually tested and evaluated using HIL-simulations. The HIL increases the degree of realistic testing of any system. Moreover, it helps in designing the structure and control of the system under test so that it works effectively in the situations that will be encountered in the system. Due to the size and the complexity of interaction within a power network, most research is based on pure simulation. To validate the performance of physical generator or protection system, most testing is constrained to very simple power network. This research, however, examines a method to test power system hardware within a complex virtual environment using the concept of the HIL. The HIL testing for electronic control units and power systems protection device can be easily performed at signal level. But performance of power systems equipments, such as distributed generation systems can not be evaluated at signal level using HIL testing. The HIL testing for power systems equipments is termed here as ‘Power Network in the Loop’ (PNIL). PNIL testing can only be performed at power level and requires a power amplifier that can amplify the simulation signal to the power level. A power network is divided in two parts. One part represents the Power Network Under Test (PNUT) and the other part represents the rest of the complex network. The complex network is simulated in real time simulator (RTS) while the PNUT is connected to the Voltage Source Converter (VSC) based power amplifier. Two way interaction between the simulator and amplifier is performed using analog to digital (A/D) and digital to analog (D/A) converters. The power amplifier amplifies the current or voltage signal of simulator to the power level and establishes the power level interaction between RTS and PNUT. In the first part of this thesis, design and control of a VSC based power amplifier that can amplify a broadband voltage signal is presented. A new Hybrid Discontinuous Control method is proposed for the amplifier. This amplifier can be used for several power systems applications. In the first part of the thesis, use of this amplifier in DSTATCOM and UPS applications are presented. In the later part of this thesis the solution of network in the loop testing with the help of this amplifier is reported. The experimental setup for PNIL testing is built in the laboratory of Queensland University of Technology and the feasibility of PNIL testing has been evaluated using the experimental studies. In the last section of this thesis a universal load with power regenerative capability is designed. This universal load is used to test the DG system using PNIL concepts. This thesis is composed of published/submitted papers that form the chapters in this dissertation. Each paper has been published or submitted during the period of candidature. Chapter 1 integrates all the papers to provide a coherent view of wide bandwidth switching amplifier and its used in different power systems applications specially for the solution of power systems testing using PNIL.