Understanding the dynamic response of phreatic aquifers due to recharge is most important for the proper management of ground-water systems. In this paper an analytical solution is developed to describe the water-table fluctuation in a finite aquifer system due to transient recharge from two...

Among several hydrological models developed over the years, the most widely used technique for estimating direct runoff depth from storm rainfall i.e., the United States Department of Agriculture (USDA) Soil Conservation Service’s (SCS) Curve Number (CN) method was adopted in the present...

The ability to assess faults in a system, while it is operating, requires an appropriate set of measurements. Engine availability can be increased if the faults can be detected, isolated and assessed, so enabling an optimised shutdown of the plant for maintenance to ensue. Depending on the...

World developments have led the armed forces of many countries to become more aware of how their increasingly-stringent financial budgets are spent. One major expenditure for military authorities is upon aero-engines. Deterioration of an engine generally results in a lower specific thrust and...

Sensor failures are a major cause of concern in engine-performance monitoring as they can result in false alarms and, in some cases, lead to the condemnation of a non-offending component or section of the engine. This condition has the potential to increase engine downtime and thus incur higher...

Political and socio-economic increasingly-stringent restrictions have led the armed forces of democratic countries to become more aware of how their financial budgets are spent. One major expenditure for military authorities is upon aero-engine maintanence because in-service worsening...

Some in-service deterioration in any mechanical device, such as an aircraft's gas-turbine engine, is inevitable. However, its extent and rate depend upon the qualities of design and manufacturing, as well as on the maintenance/repair practices followed by the users. Each deterioration has an...

The aim of this investigation is to describe a way of setting up a fuzzy-logic process to achieve diagnoses, based on gas-path measurements, for modern military turbofan engines. Each engine's gas-path components' faults are quantified, taking into account measurement noise, through a non-linear...

For an assumed aircraft's mission profile (consisting of several flight stages), using a bespoke computer simulation, the consequences of engine deterioration upon the weight of the fuel that has to be carried and consumed are predicted. This will help in making wiser management decisions (such...

The aim of this investigation is to be able to diagnose gas-path faults in gas turbines by minimising the differences between the observed and simulated data for the engine's behaviour. The simulated data are generated using a known set of faults as the input to the engine-behaviour aero-thermo...