M. Antonini , D. Fausti , M. Mor ,
 PoliBrixia s.r.l., Brescia, Italy
In this paper, the “Morton Effect” is analyzed. This phenomenon is a particular kind of rotor instability due to non-uniform journal bearing heating. In this paper, an overview of the previous works has been done. After this preliminary study, a specific approach suggested by literature has been chosen and analyzed. A thermal model, a rotor dynamic model and a stability criterion were implemented with COMSOL®.
M. Mor, C. Seneci, V. Zacché, C. Remino, G. Petrogalli, D. Fausti,
Polibrixia, Brescia, Italy
This paper presents the study and design of a new generation oven for PET blow-molding machines. The design faced several technical challenges such as: the temperature distribution in the critical areas, the sharp curvature radius, the high PET thermal inertia and the presence of boundary elements, which affected the overall performances. The work included an analysis of the preform material and geometric influence on the heating and transformation process, followed by the definition of the model to implement in a simulation. Finally a series of simulations aimed to simulate the infra red heating system and the convective cooling system, necessary to control the heating process, achieving the ideal temperature distribution, more efficiency, energy saving and higher modularity.
Research activity carried out for Salei-SIL Lumezzane (Brescia), in collaboration with the Department of Mechanical and Industrial Engineering of the University of Brescia.
The first objective of the work is to identify a general mathematical methodology for the synthesis of the profile of the gerotor pump. The classic approach allows to generate profiles from typical circular generating curves; We want to extend the methodology to generally complex geometric shapes describable by Bezier curves.
The generation of the procedure brings with it a greater flexibility in the form of the obtained profiles and therefore a greater freedom of choice of the profile that best respects the specific needs to which the pump will have to face. We want to propose an automatic search for the best solution.
The features for pumps are the following:
– Wear and tear
– Respect to cylinder displacements and maximum dimensions.
We intend to propose a methodology of excellent.