The Experts below are selected from a list of 38847 Experts worldwide ranked by ideXlab platform
Nitin P Padture - One of the best experts on this subject based on the ideXlab platform.
-
Thermal-barrier coatings for more efficient gas-Turbine Engines
MRS Bulletin, 2012Co-Authors: D.r. Clarke, Matthias Oechsner, Nitin P PadtureAbstract:Gas-Turbine Engines used in transportation, energy, and defense sectors rely on high-temperature thermal-barrier coatings (TBCs) for improved effi ciencies and power. The promise of still higher effi ciencies and other benefi ts is driving TBCs research and development worldwide. An introduction to TBCs—complex, multi-layer evolving systems—is presented, where these fascinating systems touch on several known phenomena in materials science and engineering. Critical elements identifi ed as being important to the development of future TBCs form the basis for the fi ve articles in this issue of MRS Bulletin . These articles are introduced, together with a discussion of the major challenges to improved coating development and the rich opportunities for materials research they provide.
D.r. Clarke - One of the best experts on this subject based on the ideXlab platform.
-
Thermal-barrier coatings for more efficient gas-Turbine Engines
MRS Bulletin, 2012Co-Authors: D.r. Clarke, Matthias Oechsner, Nitin P PadtureAbstract:Gas-Turbine Engines used in transportation, energy, and defense sectors rely on high-temperature thermal-barrier coatings (TBCs) for improved effi ciencies and power. The promise of still higher effi ciencies and other benefi ts is driving TBCs research and development worldwide. An introduction to TBCs—complex, multi-layer evolving systems—is presented, where these fascinating systems touch on several known phenomena in materials science and engineering. Critical elements identifi ed as being important to the development of future TBCs form the basis for the fi ve articles in this issue of MRS Bulletin . These articles are introduced, together with a discussion of the major challenges to improved coating development and the rich opportunities for materials research they provide.
A. Grządziela - One of the best experts on this subject based on the ideXlab platform.
-
Diagnosing of Rotor Systems of Marine Gas Turbine Engines in Nonstationary States
Condition Monitoring of Machinery in Non-Stationary Operations, 2012Co-Authors: A. GrządzielaAbstract:Vibration tests of marine gas Turbine Engines are performed as research of on-line and off-line types. On-line Systems generally monitored one or two vibration symptoms, which asses the limited and/or the critical values of parameters and they, potentially, can warn and/or shutdown Engines. Off-line Systems are usually used for vibration analysis during non-steady state of work. The paper presents comparison of different methods of analysis of vibration symptoms measured under run-up and shut-down processes of marine gas Turbine Engines. Results of tests were recorded on gas Turbine engine DR76 type of the COGAG type propulsion system. Main goal of the research was qualified on helpfulness and unambiguous result, from synchronous measurement, order tracking and auto tracking. All vibration symptoms were chosen from the methodology of the diagnosing gas Turbine Engines operated in the Polish Navy, called Base Diagnosing System. Second purpose of the paper was the estimation of the possibility of usage those analysis methods of gas Turbine Engines for on-line monitoring systems.
-
Diagnosis of gas Turbine Engines rotors systems in nonstationary states
Journal of Polish CIMAC, 2011Co-Authors: A. GrządzielaAbstract:Vibration tests of marine gas Turbine Engines are performed as research of on-line and off-line types. On-line Systems generally monitored one or two vibration symptoms, which asses the limited and/or the critical values of parameters and they, potentially, can warn and/or shutdown Engines. Off-line Systems are usually used for vibration analysis during non-steady state of work. The paper presents comparison of different methods of analysis of vibration symptoms measured under run-up and shut-down processes of marine gas Turbine Engines. Results of tests were recorded on gas Turbine engine DR76 type of the COGAG type propulsion system. Main goal of the research was qualified on helpfulness and unambiguous result, from synchronous measurement, order tracking and auto tracking. All vibration symptoms were chosen from the methodology of the diagnosing gas Turbine Engines operated in the Polish Navy, called Base Diagnosing System. Second purpose of the paper was the estimation of the possibility of usage those analysis methods of gas Turbine Engines for on-line monitoring systems. Ke words: dynamics, gas Turbines, rotor vibration, run–up process
-
VIBRATION DIAGNOSTICS OF MARINE GAS Turbine Engines
Journal of KONES, 2011Co-Authors: A. Grządziela, A. CharchalisAbstract:Vibration tests of marine gas Turbine Engines are performed as researches on-line and off-line types. The paper presents analyses of both methods. Results of tests were received on three types of gas Turbine Engines operated in the COGAG type propulsion systems. The application of periodical diagnostic procedures or on-line monitoring systems makes it possible to operate ship propulsion systems in accordance with their current technical state. In the case of ship gas Turbines the hourly period of scheduled maintenance or repair surveys is presently the criterion for maintenance time determination. The Finite Element Analysis (FEA) is used for confirmation actual technical state. FEA are used successfully for a wide range of problems and it may also be used for the modelling and analysis of rotor system. Presently, the diagnostics team uses FEA and the modelling of rotordynamics in conjunction with vibration analysis for detection and identification of unbalancing. Main goal of researches was qualified of helpfulness and unequivocally results received by methods of synchronous measurement, order tracking and auto tracking. All vibration symptoms were chosen from the methodology of the diagnosing gas Turbine Engines operated in the Polish Navy, called BDS (Base Diagnosing System). This element of BDS is accepted and used in all ships of Polish Navy, which are powered by the COGAG power plant. Second purpose of researches was estimation of the possibility of implementation presented methods of vibration analyses of gas Turbine Engines fornew, modern on-line monitoring system. The proposed diagnostics method makes it possible to determine the limiting value of vibration symptoms witch, if exceeded, indicates the inadmissible axis slope value between rotated machines of gas Turbine engine and, more-over, it provides an unambiguous relationship between the value of symptom of rotors unbalance and the rotors rotational speed.
Matthias Oechsner - One of the best experts on this subject based on the ideXlab platform.
-
Thermal-barrier coatings for more efficient gas-Turbine Engines
MRS Bulletin, 2012Co-Authors: D.r. Clarke, Matthias Oechsner, Nitin P PadtureAbstract:Gas-Turbine Engines used in transportation, energy, and defense sectors rely on high-temperature thermal-barrier coatings (TBCs) for improved effi ciencies and power. The promise of still higher effi ciencies and other benefi ts is driving TBCs research and development worldwide. An introduction to TBCs—complex, multi-layer evolving systems—is presented, where these fascinating systems touch on several known phenomena in materials science and engineering. Critical elements identifi ed as being important to the development of future TBCs form the basis for the fi ve articles in this issue of MRS Bulletin . These articles are introduced, together with a discussion of the major challenges to improved coating development and the rich opportunities for materials research they provide.
Charles A. Skarvan - One of the best experts on this subject based on the ideXlab platform.
-
Design of Robust Controllers for Gas Turbine Engines
Journal of Engineering for Gas Turbines and Power, 1991Co-Authors: David E. Moellenhoff, S. Vittal Rao, Charles A. SkarvanAbstract:This paper describes robust controller design methodologies for gas Turbine Engines. A linear state variable model for the engine is derived using partial derivatives. The Linear Quadratic Gaussian with Loop Transfer Recovery (LQG/LTR) and the Parameter Robust Linear Quadratic Gaussian (PRLQG) robust controller design methodologies have been used to design a controller for gas Turbine Engines. A new method is proposed by combining the features of LQG/LTR and PRLQG methods
