During the lift-off of a launch vehicle, the acoustic pressure fluctuations caused by the engine exhaust gases produce high noise levels inside the cavity of the fairing and can damage the payload inside the fairing. Hence reducing the noise transmitted into the payload bay is an important area of research. Work presented in this thesis investigates the external acoustic pressure excitations on the fairing of a launch vehicle during the lift-off acoustic environment. In particular, it investigates the external sound pressure levels in the low frequency range from 50Hz to 400Hz, on the fairing during the lift-off of a launch vehicle. This study establishes theoretical and numerical models for the prediction of external sound pressure loading on composite structures representing launch vehicles, such as a large composite cylinder referred to as a Boeing cylinder and a Representative Small Launch Vehicle Fairing (RSLVF). To predict the external sound pressure loading, various incident wave conditions were investigated, including incident plane waves, oblique plane waves and oblique plane waves with random phases that strike the circumference of the composite structures. For the theoretical model, both the incident and scattered sound pressure fields due to incident plane waves; perpendicular to an idealised long cylinder were investigated. The results show that the scattered sound pressure field plays a major role in determining the total circumferential sound pressure field at the surface of the cylinder and cannot be ignored for the launch case. The theoretical model was developed further for a point source, line source and oblique incident waves, and modified to determine the incident, scattered and total sound pressure fields away from the cylinder. The approach developed overcomes some limitations of previous analytical derivations. An experiment was undertaken to determine the sound pressure patterns at the surface of a cylinder at various frequencies due to a point source positioned at a finite distance from the cylinder surface. The experimental work confirmed the accuracy of the theoretical model for a point source at a finite distance from the cylinder. The Boundary Element Method (BEM), approach was used for the numerical investigation of the acoustic loadings. The numerical analysis was developed for various acoustic loading conditions and verified with the theoretical results, which showed that the numerical and theoretical models agree well. Both models were extended to a Boeing composite cylinder and an RSLVF for various acoustic loading conditions. The complex acoustic environment generated during the lift-off of a launch vehicle was investigated and used as a basis for the acoustic loading on an RSLVF. To predict the acoustic excitations on an RSLVF, two different source allocation techniques were investigated, which considered acoustic sources along the rocket engine exhaust flow. The investigations were conducted both numerically and analytically. Both results agree well and show that it is possible to predict the acoustic loads on the fairing numerically and analytically. / http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1347443 / Thesis (Ph.D.) -- University of Adelaide, School of Mechanical Engineering, 2008

Virtual reality is a rapidly growing innovation that has many real-world applications inengineering, healthcare, education and much more. More startups are emerging, and someof these companies are developing virtual reality simulators that allows the user toimmerse themselves completely in the virtual world with the use hardware devices.Companies like Infinadeck and Omnifinity have developed one such hardware known asthe walking simulator. This paper studied virtual reality and the barriers that occur whenlaunching a virtual reality walking simulator in the US for the entertainment industry. Theresearch was conducted on B2B companies that manufacture and use virtual realitywalking simulators with the addition of an industry outside of the entertainment industryto allow for comparison of the barriers. This study was a qualitative and comparativestudy based on a theoretical framework combined with empirical findings gathered fromeleven interviews with individuals from the manufacturers, entertainment center and themilitary. By analyzing and comparing the findings throughout this study, the authors canconclude that there are several barriers that can occur and affect launching a virtual realitywalking simulator process negatively. The barriers identified were price, hesitation to tryand reliability. These findings when analyzed with the theoretical framework identified that the emergence of these barriers was due to VR being such advanced technology. Thecustomers understanding of the value it creates is a determining factor when deciding tomake the purchase which showed to be highly complex with the VR walking simulator.The study also offers suggestions that can be taken for future research.

Orientadores: João Mauricio Rosario, Francisco Carlos Parquet Bizarria. / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica / Made available in DSpace on 2018-08-12T03:58:51Z (GMT). No. of bitstreams: 1 Barbosa_SilvanaAparecida_D.pdf: 3254271 bytes, checksum: dfd0e2d57b3560c893dad3675337cfe9 (MD5) Previous issue date: 2008 / Resumo: A tarefa contínua de detecção de mudança de cenários em determinado ambiente pode ocasionar estresse físico e mental para o supervisor. Com o uso da visão computacional associada à automação é possível oferecer recursos para que essa tarefa seja executada de forma automatizada. Neste contexto, este trabalho apresenta uma proposta de arquitetura para um sistema detectar mudanças de cenários por meio da comparação sucessiva de imagens. Esse sistema de visão deverá possibilitar por meio da implementação de um algoritmo, utilizando recursos matemáticos específicos para a aplicação, a detecção de mudança no cenário e o registro das imagens relativas a essa situação. Para validar a referida proposta, com o enfoque na aplicação aeroespacial, é apresentado nesta tese o estudo de caso para aplicação de técnicas de Visão Artificial na Detecção de Mudança de Cenários em Plataforma de Integração de Veículos Espaciais. Esse estudo visa supervisionar áreas destinadas principalmente à integração e aos testes desse veículo espacial. A implementação desse algoritmo utiliza técnicas de processamento de imagens baseada em filtros espaciais, em especial convolução por filtro da média. Os resultados satisfatórios, obtidos nos ensaios práticos realizados em protótipo da Torre Móvel de Integração, indicam que o sistema é adequado para aplicação a qual se destina. / Abstract: The continuous task of detecting changes in scenarios can cause a mental and physical stress on supervisor. The associated use of computational vision and automation provides resources to execute this task in an automated way. This thesis presents an architectural proposal for a system to detect changes in the imaged scenes by comparing images successively. Through the development of algorithm using specific mathematical tools, this vision system detects and record changes in the imaged scenes. Focusing aerospace area to validate this proposal, Artificial Vision Applied in Detection of Change of Scenes, a Study of Case in Platform for Integration of Space Vehicles is presented in this thesis. The purpose of this research is supervising the designed areas for integration and tests of the space vehicle. Image processing techniques based on spatial filters, in particular convolution, are used for algorithm development. The results obtained through practical tests executed on a prototype of an Integration Mobile Tower, show the system is appropriate to this application. / Doutorado / Mecanica dos Sólidos e Projeto Mecanico / Doutor em Engenharia Mecânica

A main topic of thesis has been new product launch of lever arch file OneTip. The goal has been to evaluate propriety and correctness of marketing tools used. I defined crucial project points and set up my own solutions and proposals in marketing recommendation chapter.

This thesis deals with the introduction of a new product to the local market. It is a frozen food category item, more precisely ice cream and was marketed under traditional Misa brand. The theoretical part of the thesis summarizes the interpretation of terms and important issues related to the field of study -- brand management, marketing planning and marketing mix. Practical part presents results of a qualitative research conducted as set of individual in depth interviews, on a sample of 12 respondents, with the aim to analyze motivation, needs, habits and desires of buyers when making purchase decision, and value the importance of traditional brand in the process of making purchase decision.

This thesis sets out to analyse marketing strategy of new product launch. Through review of relevant literature and papers it analyses approaches to new product launch onto an existing market from the marketing perspective. Marketing mix, diffusion of innovations and late entry into the market with dominant brand are at the core of the theoretical part. This theory is later applied at the specific case of Honda's first robotic mower and its European launch. Honda is a traditional Japanese manufacturer of cars, motorbikes, engines and an established producer of premium products in the power equipment market and is introduced in details in this thesis. To provide a complete picture, thorough macroeconomic and competition analysis is conducted together with possible outlooks into the future developments of the market.

This thesis represents marketing plan and strategy formulation for launch of new model Dacia Sandero on czech market. Logical structure of this thesis is split into three parts. First part is focused on definition of used terms and metodology used in analytic part of the thesis. Following part is describing Dacia brand and Renault Czech republic to get all relevant information, which influences the brand it self. Last part starts with market analysis in european market context followed by portfolio analysis. Next part is focused on market and segment forecast and marketing mix specification. Last chapter is comparing the strategy from the thesis with real used strategy.

This thesis deals with market launch of new model generation of Hyundai Tucson on Czech market. Suggestions a recommendations for new model launch are supported by detailed analysis based on intern sources and secondary data, which are divided to several following parts: Czech automotive market analysis, analysis of Sport Utility Vehicles, consumer insight analysis of previous model generation, introduction of new generation and its key features, competitors overview and comparison with them, marketing communication of Hyundai carmaker, previous model generation and its competitors and positioning. Conclusion and target of this thesis are proposals and recommendations to new model generation launch focused on product, target group, competitors and communication.

This master thesis focuses on literature research of problematics linked to power actuators working on electromagnetic principle to accelerate metal projectiles. It’s goal is mathematical analysis and constuction of selected type of electromagntic power actuator – induction coilgun

The Hybrid approach of development has for a long time been the dominating way to develop cross-platform applications targeting both the web and mobile. In recent years, a new combination of technology has appeared called Progressive Web Application (PWA) which aims to combine Native capabilities with best practices of the web to deliver a new Native-like experience to users without the need of Native wrappers. So far PWAs have proven to be the inferior choice when it came to performance and platform support. The purpose of this study is to compare the two technologies based on a literature review and evaluate the current performance across three parameters in an experiment - battery consumption, CPU utilization and time to first activity. Two applications were developed using each respective technique, with the Apache Cordova framework being used for the Hybrid approach and the React framework being used to implement PWA features. The results showed that the Hybrid approach is better in the majority of tests, offering more in terms of platform API access and providing better performance while only being slower when it came to time it took to first activity; but something to consider is that the PWA approach was not far behind. The conclusion this study arrived at was that PWAs have developed significantly since previous studies and is almost able to match Hybrid apps in terms of APIs and performance, but that Hybrid apps are still the preferred choice when it comes to performance. Further development and a wider adaptation of the PWA specification could very well change the way developers choose to approach mobile app development in the future as well as a potential for bringing the web closer to the mobile platform.