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Keywords: probability
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Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. March 2012, 134(3): 032504.
Published Online: January 3, 2012
... probability rotors The influence of manufacturing variability on the performance of gas turbine blades has been the subject of various investigations in recent years. Garzon and Darmofal [( 1 )] introduced a methodology for considering real geometry in computational fluid dynamics (CFD) simulations...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. September 2011, 133(9): 092502.
Published Online: April 19, 2011
... design engineering flow simulation gas turbines probability sensitivity analysis Gas turbine engine secondary airflow systems (SAS) are sensitive to variation from many sources, where the total number ranges from at least 100 to many more. Sources of variation in a flight engine include...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. August 2011, 133(8): 082502.
Published Online: April 5, 2011
... of which may lead to premature fracture. The probability of failure of a component with multiple anomaly types can be predicted using established system reliability methods provided that the failure probabilities associated with individual anomaly types are known. Unfortunately, these failure probabilities...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. January 2011, 133(1): 012901.
Published Online: September 24, 2010
... over time, namely, the random variable (RV) rate and the gamma random process (GP) model. These models are used to derive the lifetime probability distribution and predict the expected number of substandard pipes in any operating interval. This paper also describes statistical estimation of the models...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. July 2010, 132(7): 072502.
Published Online: April 14, 2010
... of the fretting process is formulated and calibrated using failure data from an existing engine fleet. The resulting calibrated model is used to quantify the influence of inspection on the probability of fracture of an actual military engine disk under real life loading conditions. The results can be applied...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. March 2010, 132(3): 031602.
Published Online: December 3, 2009
... detection technique, which is based on Bayesian forecasting and dynamic linear models (DLMs). Bayesian forecasting enables the calculation of conditional probabilities, whereas DLMs are a mathematical tool for time series analysis. The combination of the two methods can be used to calculate probability...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. September 2009, 131(5): 051601.
Published Online: June 9, 2009
.... The results are used to derive fault probabilities, which are then fused to derive a conclusion as to the location of a fault. Once the set of possible faulty components is determined, a well defined diagnostic problem is formulated and the faulty parameters are determined by means of a suitable algorithm...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. May 2009, 131(3): 032503.
Published Online: January 29, 2009
...Sean Bradshaw; Ian Waitz This paper presents a probability-based systems-level approach for assessing the impact of manufacturing variability on combustor liner durability. Simplified models are used to link combustor life, liner temperature variability, and the effects of manufacturing variability...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. January 2009, 131(1): 012506.
Published Online: October 13, 2008
... cycle, jump phenomena, etc. The transitional probability density function (PDF) for the random response of nonlinear systems under white or colored noise excitation (delta-correlated) is governed by both the forward Fokker–Planck (FP) and backward Kolmogorov equations. This paper presents efficient...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. July 2008, 130(4): 041602.
Published Online: April 29, 2008
... data visualisation fault diagnosis gas turbines jet engines least mean squares methods neural nets principal component analysis probability self-organising feature maps support vector machines Safety-critical systems, such as gas turbine engines, demand real-time fault detection...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. July 2008, 130(4): 042507.
Published Online: April 29, 2008
... the impact of feature deviations on performance relevant metrics, nonlinear sensitivity functions are used to obtain scalars and offsets on turbomachinery maps, which reflect module behavior during operation. Probability density functions (PDFs) of user-defined performance parameters of an engine fleet...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. July 2007, 129(3): 827–835.
Published Online: September 15, 2006
...Harry R. Millwater; Michael P. Enright; Simeon H. K. Fitch Titanium gas turbine disks are subject to a rare but not insignificant probability of fracture due to metallurgical defects, particularly hard α . A probabilistic methodology has been developed and implemented in concordance...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. July 2005, 127(3): 483–491.
Published Online: June 24, 2005
... are excellently predicted, and the mean axial velocities are in fairly good agreement with the experimental data for all three combustion models. The mean temperature profiles are fairly well captured by the probability density function (PDF) and eddy dissipation (EDS) combustion models. However, the EDS-finite...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. July 2005, 127(3): 621–628.
Published Online: June 24, 2005
.... 13 June 2004 01 October 2003 01 March 2004 24 06 2005 blades tolerance analysis reliability nonparametric statistics probability manufacturing industries It is well known that the description of a bladed disk using its cyclic symmetry properties 1 2...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. July 2004, 126(3): 610–618.
Published Online: August 11, 2004
...E. Capiez-Lernout, Graduate Student; C. Soize, Professor The random character of blade mistuning is a motivation to construct probability models of random uncertainties. Recently, a new approach known as a nonparametric model of random uncertainties, based on the entropy optimization principle...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. January 2004, 126(1): 107–118.
Published Online: March 2, 2004
.... A capacitance sensor for instantaneous void fraction measurements was developed. The mean and probability density function of the instantaneous void fraction signal can be used to effectively identify the different flow regimes. The current flow regime data show significant differences in the transitional...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. January 2004, 126(1): 155–159.
Published Online: March 2, 2004
... engineering time required by the corresponding OEM tool. In addition, one manufacturer assessed the field experiences of over 50 engine disks of varying levels of maturity using DARWIN™. This included various titanium alloys with different disk and hub geometries. The computed probability of fracture...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. April 2001, 123(2): 388–394.
Published Online: June 9, 2000
...M. P. Mignolet; C.-C. Lin; B. H. LaBorde A recently introduced perturbation technique is employed to derive a novel closed form model for the probability density function of the resonant and near-resonant, steady state amplitude of blade response in randomly mistuned disks. In its most general form...
Journal Articles
Article Type: Technical Papers—Special Ice Section
J. Eng. Gas Turbines Power. October 2000, 122(4): 526–532.
Published Online: August 31, 1999
...Dinu Taraza The paper presents an original probabilistic model of the balance of internal combustion engines. The model considers the manufacturing tolerances and predicts the most probable value of the first-order residual unbalance for engines that—theoretically—have the first order forces...