Theoretical analysis and experiments were carried out on cylindrical oil squeeze film dampers. The finite element method (FEM) was applied for calculating pressure distribution in the dampers with end seals and oil grooves. Measurements of the viscous damping coefficient of several dampers were conducted and compared with theoretical values. The effects of the dampers on the vibrational characteristics of engines were reviewed through theoretical analysis and experiments on an engine model. Then, the effects of squeeze film dampers on an actual engine were evaluated for design information.
Experiments and theoretical analysis were made on the unbalance vibration of the single spool turbo-jet engine JR 200 and of its simplified model which simulated vibration characteristics of the engine.
Thermal residual stress (TRS) created in metal matrix composite influences the mechanical properties of composites. In this paper, we present the TRS-modulated tensile properties of continuous SiC fiber reinforced titanium (SiC/Ti) composite. The magnitude and distribution of TRS inside SiC/Ti were evaluated by using a simple 1-D beam model considering fiber-matrix structure and then a full 3-D FEM model. The bending of the SiC/Ti specimen resulting from the asymmetrical fiber placements was used as a measure to verify the pertinence of the mechanical models. A 3-D FEM simulation accounting all TRS information gives a good prediction of the composite's tensile properties.
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