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The present document is aimed to propose a suitable thermal model for the cooling down process of a one piston air cooled reciprocating compressor. In order to achieve this, a thermographic camera is used to record the temperature of different measuring points throughout different operating conditions. This data is later analyzed, with statistical tools and graphical visualization. The thermal phenomena present in the thermal process is characterized according to the compressors' geometry. Finally, using the analysis and taking into consideration the thermal phenomena the optimal thermal model is selected. This paper belongs to a bigger project and the last step is to simulate the compressor and the accuracy of the proposed model.
As society continues to age, the implementation of hip stems increases every year. However, there are a variety of different hip stem designs.
The aim of this project is to analyze which hip stem design implemented in a femur is most effective under different static loading conditions such as gait and sideways falling. In addition, a four-point-bending test was carried out. Therefore, the tech-niques were simulated in silico by FEA with Abaqus/CAE 2019.
A short stem, a straight stem and an anatomical stem were tested. All prosthesis are cementless press-fit stems. Each hip stem was examined in physiological and osteoporotic bone applying all three tests. To compare the stems the tests were also applied on a native bone model as a reference. Boundary conditions were used in order to simulate the tests.
The average von Mises stress, tension, compression and the risk of fracture were extracted and compared.
Biomechanical results show that the straight stem induces higher von Mises stresses compared to the anatomical stem. The risk of fracture is higher for osteo-porotic bone than for physiological bone. However, there is no risk of fracture as all the results are below the risk of value.
Schluckspecht project
(2022)