Environmental and economic considerations urge companies to seek better, more efficient ways of using available resources. Energy is one of these resources, and railway systems are large consumers of electricity, indeed. Even the slightest improvement in the energy consumption of trains can lead to very visible effects, helping to reduce CO2 emissions and to improve
Introduction ‘Parametric roll’ is a phenomenon that sometimes suddenly occurs to ships sailing in the head or following seas. Apparently, without any clear reason, the amplitude of the roll motion (i.e. the rotation about the longitudinal axis of the ship) increases within a couple of roll periods, from a few degrees to above 45 degrees.
We train physiotherapists in treating patients with knee osteoarthritis (degenerated, damaged cartilage). Overload of joints should be avoided, especially the repetitive impact on the affected leg, as this is related to cartilage degeneration. Three-dimensional motion analysis allows us to measure joint load with high precision but is very expensive. Together with physiotherapists and universities, we