The extraction and exploitation of existing knowledge assets for supporting decision making and increasing the effectiveness of various internal and external interventions is of critical importance for the success of modern organizations. The use of advanced Operational Research-based quantitative methods in combination with high capabilities information systems can be very useful for this purp...

costs associated with them but is also costly when done frequently. That is why substantial efforts have been invested in minimizing the expected total cost due to failures and preventive maintenance of industrial equipment (Dekker 1996, Tan and Kramer 1997, Bäckert and Rippin 1985, Dekker and Scarf 1998). In industry, most preventive-maintenance approaches include the use of fixed schedules, o...

Gas turbine engines are used in a variety of power generation applications, including providing thrust for the F-35 Lightning II Joint Strike Fighter, turning electrical generators in combined-cycle power plants, and powering the M1 Abrams Main Battle Tank. In the high-temperature region of the turbine section, a complex vortical (swirling) flow present near the junction of a turbine airfoil an...

The Pacific Northwest National Laboratory (PNNL) has conducted R&D for the US Army on prognostics health monitoring (PHM). The main focus of the work was to demonstrate the feasibility of developing an onboard PHM system for the gas turbine engine used on the M1 Abrams tank. Research was performed on methods for real time, onboard prognostics/engine life expectancy forecasting, and a prototype ...

High-pressure turbine blades in a gas turbine engine are constantly exposed to extremely hostile operating conditions, where temperatures can regularly exceed the melting point of the parent material. These conditions make the blades susceptible to thermal fatigue cracking, corrosion and, in some cases, damage due to particle impact. The required inspection method in aerospace for finding surfa...

hydrogen is seen as one of the important energy carriers of the future with potential to reduce local as well as global warming. the main by-product of the combustion of hydrogen in air is water vapor and trace quantities of oxides of nitrogen. an experiment was conducted to study the impact of hydrogen/natural gas blends on performance, thermodynamic efficiency and exhaust gas emissions in a r...

The DLR LUMEN (Liquid Upper stage deMonstrator ENgine) rocket engine comprises of two separate turbopumps, one each for Liquid Oxygen (LOX) and Liquified Natural Gas (LNG) supply. In both an identical bearing block separates the pump section from turbine section. current design, features oil-jet lubrication system to cool lubricate bearings during operation. Cryogenic conditions at pump-interfa...

This paper analyses unstable mode of a free gas turbine turboshaft helicopter engine TV3-117. The analysis is focused on the conditions this phenomenon and possibilities its solution in an industrial turbocharger with turbine. Knowing causes operation will allow pilots to prevent accidents increase level flight safety.