The course is the second module of the “Thin Film and Gas-Lubricated Bearings” course, which is held at PoliTO and EPFL at alternate years. This module is focused on the high-speed industrial applications of gas bearings, in particular on dynamic bearings and illustrates the recent developments of such components in the micro-turbomachinery applications. The course includes rotordynamics to enable the assessment of gas-bearing supported rotors.

Guest Lecture: Jürg Schiffman is Associate Professor at EPFL. He is responsible of the Laboratory for Applied Mechanical Design (LAMD), which contributes to improving energy conversion efficiency through integrated design and optimization approaches. Research is focused on the design and experimental investigation turbomachinery, which has been identified as a key enabler to improve the efficiency of decentralized energy conversion systems. Typical applications range from small scale compressors for domestic heat pumps to high speed expanders for waste heat recovery using Organic Rankine Cycles on trucks and cars. The design of such devices is characterized by a high level of complexity, pronounced multidisciplinarity and by competing design objectives. Besides data driven modeling, integrated mechanical design and optimization methodologies, research activities include high-speed gas bearing technologies and their effect on rotordynamics as well as aerodynamics of small-scale turbomachinery Programme: • Dynamic grooved bearings • Real gas effects • Condensation • Practical implementation of gas-lubricated bearings • Rotordynamics

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P.D.2-2 - Giugno