This paper proposes a method to quickly and accurately predict the dynamic response of a power system during an under-frequency load shedding scenario. Emergency actions in a power system due to loss of generation typically calls for under-frequency load shedding measures to avoid potential collapse due to the lack of time in which to correct the imbalance via other means. Due to the slow and r...

The question of extending limit analysis to materials with a non-associated flow rule is an old but important one. Many frictional soils, such as sands and drained clays, do not display the large volume change upon shearing that is predicted by an associated flow rule, thus calling into question the collapse loads that are found from the classical limit theorems. This question is important in p...

The numerical solution of a non-smooth minimization problem arising in the stress analysis of a plastic body is investigated. The problem of interest is the computation of the maximal stress of an elastic three-dimensional body under external forces [3, 18]. The computation of that threshold allows one to determine if the material can support the forces applied to it or if the traction on the m...