| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 11.48 MB | Adobe PDF |
Advisor(s)
Abstract(s)
O fabrico dos veículos tem subjacente uma utilização específica, sendo construídos com base em estudos tendentes a um desempenho eficaz nas suas diversas vertentes, sendo exigência primária a segurança do veículo. Sucede, no entanto, que há diversas atividades às quais os veículos disponíveis, construídos de fábrica, não servem na sua plenitude, gerando a necessidade de efetuar alterações que vão ao encontro dessas necessidades. A implementação dessas alterações deverá, contudo, obedecer a estudos e serem efetuadas com garantia de bom desempenho, nunca perdendo de vista a necessidade de operarem
em segurança, garante dos seus utilizadores e de terceiros que circulem ou se encontrem próximos dos veículos.
Pretende-se, pois, a abordagem do tema na presente dissertação, tendo-se, em vista o estudo das alterações dimensionais e geométricas efetuadas em veículos, mais concretamente veículos fúnebres, a análise das implicações de tais alterações, com realização estudos de rigidez dos chassis, tendo sempre em vista a garantia de circulação em segurança. Abordar-se-á o estudo dos diferentes comprimentos do chassis, os deslocamentos e tensões equivalentes de Von-Mises, demonstrando-se que o aumento do comprimento implica ao aumento dos deslocamentos e tensões o que resulta num fator de segurança
menor á medida que o comprimento do chassis aumenta.
Para tal, trataremos de realizar simulações numéricas e estudo dos chassis em software de simulação, visando conclusões sobre se as alterações aos veículos são garantidamente seguras e se trazem valor acrescentado. Visa, em resumo, a presente dissertação, abordar o tema da adequabilidade das alterações efetuadas em veículos fúnebres e a análise dessas alterações na perspetiva da robustez e segurança do veículo.
Vehicles are manufactured for a specific use and are built on the basis of studies aimed at effective performance in their various aspects, with the primary requirement being vehicle safety. However, there are a number of activities for which the vehicles available, built in the factory, are not fully suited, generating the need to make changes to meet these needs. The implementation of these alterations must, however, be subject to studies and be carried out with a guarantee of good performance, never losing sight of the need for them to operate safely, guaranteeing their users and third parties who circulate or are close to the vehicles. The aim of this dissertation is to study the dimensional and geometric changes made to vehicles, more specifically funeral vehicles, and to analyze the implications of these changes, carrying out rigidity studies of the chassis, always with a view to ensuring safe circulation. The study of different chassis lengths, equivalent Von-Mises displacements and stresses will be addressed, demonstrating that increasing length implies increasing displacements and stresses, resulting in a lower safety factor as the chassis length increases. To this end, we will try to carry out numerical simulations and study the chassis in simulation software, with a view to drawing conclusions as to whether the changes to the vehicles are guaranteed to be safe and add value. In summary, this dissertation aims to address the issue of the suitability of changes made to funeral vehicles and the analysis of these changes from the perspective of vehicle robustness and safety.
Vehicles are manufactured for a specific use and are built on the basis of studies aimed at effective performance in their various aspects, with the primary requirement being vehicle safety. However, there are a number of activities for which the vehicles available, built in the factory, are not fully suited, generating the need to make changes to meet these needs. The implementation of these alterations must, however, be subject to studies and be carried out with a guarantee of good performance, never losing sight of the need for them to operate safely, guaranteeing their users and third parties who circulate or are close to the vehicles. The aim of this dissertation is to study the dimensional and geometric changes made to vehicles, more specifically funeral vehicles, and to analyze the implications of these changes, carrying out rigidity studies of the chassis, always with a view to ensuring safe circulation. The study of different chassis lengths, equivalent Von-Mises displacements and stresses will be addressed, demonstrating that increasing length implies increasing displacements and stresses, resulting in a lower safety factor as the chassis length increases. To this end, we will try to carry out numerical simulations and study the chassis in simulation software, with a view to drawing conclusions as to whether the changes to the vehicles are guaranteed to be safe and add value. In summary, this dissertation aims to address the issue of the suitability of changes made to funeral vehicles and the analysis of these changes from the perspective of vehicle robustness and safety.
Description
Keywords
Veículos Chassis Método de elementos finitos (MEF) Otimização