| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 34.32 MB | Adobe PDF | |||
| 1.74 KB | License |
Advisor(s)
Abstract(s)
A presente Dissertação tem como objetivo a elaboração de um banco de ensaios de rolamentos, com a finalidade de avaliação das perdas de binário associadas aos rolamentos. Este projeto veio no âmbito da inexistência de um banco de ensaios normalizado no mercado para avaliação das perdas de potência. As perdas de binário associadas aos rolamentos devem-se as diferentes interações dos rolamentos com o meio a que este se encontra aplicado. Estas perdas podem ser divididas em quatro formas distintas de perdas de binário: por atrito, por escorregamento, por arrasto e por vedação. Estas perdas são dependentes das condições de serviço a que o rolamento se encontra sujeito. As condições de serviço que influenciam as perdas são as cargas aplicadas, o tipo de lubrificação, altura de imersão no lubrificante e condições de lubrificação. Posto isto, é fulcral que todos os rolamentos ensaiados em simultâneo no banco de ensaio estejam sujeitos às mesmas condições de serviço, neste caso, condições de teste. Para esse efeito serão utilizados dois cartuchos, de igual configuração, que estarão equipados com dois rolamentos. Nos cartuchos um dos rolamentos estará fixado em elementos constituintes do cartucho e no outro rolamento será aplicada uma pré-carga através de um sistema de aperto. Com a variação das diversas condições, será medida a alteração do binário por uma célula, que se encontrar entre os dois cartuchos existentes. Através da comparação dos valores obtidos nos ensaios com os valores medidos do binário em vazio conseguir-se-á medir a alteração do binário e assim determinar as perdas de potência. Estes valores recolhidos nos ensaios realizados a posteriori, permitirão tornar os modelos de perdas de binário em rolamentos mais eficazes. Todos os desenvolvimentos do banco de ensaios, quer a seleção de acessórios, a produção e explicação dos elementos, assim como os cálculos e simulações realizadas serão apresentados no decorrer do relatório.
This dissertation aims to develop a test rig for rolling bearings, with a relief for evaluating the torque losses associated with bearings. This project came within the scope of the lack of a standardized test bench in the market for evaluating power losses. Torque losses associated with bearings are due to different interactions of the bearings with the environment to which they are associated. These losses can be divided into four distinct forms of torque losses, such as rolling friction torque, sliding frictional torque, drag losses, and rolling bearing seal losses. These losses are dependent on the service conditions the bearing is in. Service conditions that influence losses are applied loads, type of lubrication, lubrication immersion height and lubrication conditions. That said, it is crucial that all bearings are tested simultaneously on the test bench devoted to service conditions, in this case, test conditions. For this purpose, two cartridges of the same configuration will be used, which are equipped with two bearings. In the cartridges, one of the bearings available in the constituent elements of the cartridge and in the other bearing a load will be applied through a tightening system. With the variation of the different conditions, the change in torque will be measured by a cell, which is located between the two existing cartridges. Measure by comparing the values in the tests with the measured values of the torque at no load to be able to measure the change in torque and thus determine how power losses. These values collected in experimental tests carried out a posteriori, allow to make the models of torque losses in bearings more efficient. All developments on the test bench, whether the selection of accessories, the production and explanation of the elements, as well as the calculations and simulations carried out during the report.
This dissertation aims to develop a test rig for rolling bearings, with a relief for evaluating the torque losses associated with bearings. This project came within the scope of the lack of a standardized test bench in the market for evaluating power losses. Torque losses associated with bearings are due to different interactions of the bearings with the environment to which they are associated. These losses can be divided into four distinct forms of torque losses, such as rolling friction torque, sliding frictional torque, drag losses, and rolling bearing seal losses. These losses are dependent on the service conditions the bearing is in. Service conditions that influence losses are applied loads, type of lubrication, lubrication immersion height and lubrication conditions. That said, it is crucial that all bearings are tested simultaneously on the test bench devoted to service conditions, in this case, test conditions. For this purpose, two cartridges of the same configuration will be used, which are equipped with two bearings. In the cartridges, one of the bearings available in the constituent elements of the cartridge and in the other bearing a load will be applied through a tightening system. With the variation of the different conditions, the change in torque will be measured by a cell, which is located between the two existing cartridges. Measure by comparing the values in the tests with the measured values of the torque at no load to be able to measure the change in torque and thus determine how power losses. These values collected in experimental tests carried out a posteriori, allow to make the models of torque losses in bearings more efficient. All developments on the test bench, whether the selection of accessories, the production and explanation of the elements, as well as the calculations and simulations carried out during the report.
Description
Keywords
Banco de Ensaios Rolamentos Perda de Potência Lubrificação Binário de arranque Test rig Rolling bearing Power loss Lubrification Non-load losses