Micromechanics and electrical conductivity of point contacts in boundary lubrication
Research methods based on recording parameters of electrical conductivity are considered for future application in nanotribology. Design relationships of conductivity are presented for idealized models of interface under conditions of boundary lubrication; contributions of various conductivity types in the total contact conductivity are estimated. An application methodology is described for the methods to study the properties of boundary lubricating layers. Some of the results obtained from the study of strength and frictional properties of boundary lubricating nanometre layers under normal load and sliding conditions are discussed.
ABSTRACTThis paper addresses the issue of reliable load frequency control design of an uncertain multi-area power system with constant time delays and disturbances via non-fragile sampled-data control approach. In particular, the parameter uncertainties are assumed to be randomly occurring which are described by the Bernoulli distributed sequences. By constructing a suitable Lyapunov–Krasovskii functional together with Wirtinger-based inequality, a new set of sufficient conditions in terms of linear matrix inequalities is obtained to ensure the asymptotic stability and extended dissipativity of the multi-area power system not only when all actuators are operational, but also in case of some actuator failures. Finally, simulation results are conducted to validate the effectiveness of the proposed control design technique.