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O. Le´onard
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Proceedings Papers

Constrained Sparse Estimation for Improved Fault Isolation

S. Borguet, O. Le´onard
Proc. ASME. GT2011, Volume 3: Controls, Diagnostics and Instrumentation; Education; Electric Power; Microturbines and Small Turbomachinery; Solar Brayton and Rankine Cycle, 199-208, June 6–10, 2011
Publisher: American Society of Mechanical Engineers
Paper No: GT2011-45711
https://doi.org/10.1115/GT2011-45711
View Paper titled, Constrained Sparse Estimation for Improved Fault Isolation
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Topics: Compressors, High pressure (Physics), Jet engines, Quadratic programming, Stators, Turbofans
Proceedings Papers

A Quasi-One-Dimensional CFD Model for Multistage Compressors

W. Du, O. Le´onard
Proc. ASME. GT2011, Volume 7: Turbomachinery, Parts A, B, and C, 101-112, June 6–10, 2011
Publisher: American Society of Mechanical Engineers
Paper No: GT2011-45497
https://doi.org/10.1115/GT2011-45497
View Paper titled, A Quasi-One-Dimensional CFD Model for Multistage Compressors
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Topics: Compressors, Computational fluid dynamics, Simulation, Surges
Proceedings Papers

Towards a High Order Throughflow: Part I—Investigating the Effectiveness of a Harmonic Reconstruction for 3D Flows

J. P. Thomas, O. Le´onard
Proc. ASME. GT2010, Volume 7: Turbomachinery, Parts A, B, and C, 831-841, June 14–18, 2010
Publisher: American Society of Mechanical Engineers
Paper No: GT2010-22841
https://doi.org/10.1115/GT2010-22841
View Paper titled, Towards a High Order Throughflow: Part I—Investigating the Effectiveness of a Harmonic Reconstruction for 3D Flows
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Topics: Flow (Dynamics), Simulation, Computation, Blades, Design, Fourier series, Hoop stress, Stress, Turbomachinery
Proceedings Papers

Towards a High Order Throughflow: Part II—Investigation of the Nonlinear Harmonic Method Coupled With an Immersed Boundary Method for the Modeling of the Circumferential Stresses

J. P. Thomas, O. Le´onard
Proc. ASME. GT2010, Volume 7: Turbomachinery, Parts A, B, and C, 843-853, June 14–18, 2010
Publisher: American Society of Mechanical Engineers
Paper No: GT2010-22842
https://doi.org/10.1115/GT2010-22842
View Paper titled, Towards a High Order Throughflow: Part II—Investigation of the Nonlinear Harmonic Method Coupled With an Immersed Boundary Method for the Modeling of the Circumferential Stresses
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Topics: Hoop stress, Modeling, Flow (Dynamics), Blades, Cylinders, Fourier series, Inviscid flow, Nonlinear systems, Turbomachinery
Proceedings Papers

A Study on Engine Health Monitoring in the Frequency Domain

S. Borguet, M. Henriksson, T. McKelvey, O. Le´onard
Proc. ASME. GT2010, Volume 3: Controls, Diagnostics and Instrumentation; Cycle Innovations; Marine, 133-142, June 14–18, 2010
Publisher: American Society of Mechanical Engineers
Paper No: GT2010-22635
https://doi.org/10.1115/GT2010-22635
View Paper titled, A Study on Engine Health Monitoring in the Frequency Domain
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Topics: Engines, Signals, Transients (Dynamics), Errors, Performance, Sensors, Steady state, Turbofans
Proceedings Papers

A Sparse Estimation Approach to Fault Isolation

S. Borguet, O. Le´onard
Proc. ASME. GT2009, Volume 1: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Controls, Diagnostics and Instrumentation; Education; Electric Power; Awards and Honors, 513-522, June 8–12, 2009
Publisher: American Society of Mechanical Engineers
Paper No: GT2009-59099
https://doi.org/10.1115/GT2009-59099
View Paper titled, A Sparse Estimation Approach to Fault Isolation
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Topics: Algorithms, Jet engines, Quadratic programming, Turbofans
Proceedings Papers

A Generalised Likelihood Ratio Test for Adaptive Gas Turbine Health Monitoring

S. Borguet, O. Le´onard
Proc. ASME. GT2008, Volume 2: Controls, Diagnostics and Instrumentation; Cycle Innovations; Electric Power, 7-17, June 9–13, 2008
Publisher: American Society of Mechanical Engineers
Paper No: GT2008-50117
https://doi.org/10.1115/GT2008-50117
View Paper titled, A Generalised Likelihood Ratio Test for Adaptive Gas Turbine Health Monitoring
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Topics: Gas turbines, Kalman filters, Aircraft engines, Algorithms, Delays, Engines
Proceedings Papers

Ten Years of Experience With a Small Jet Engine as a Support for Education

O. Le´onard, J. P. Thomas, S. Borguet
Proc. ASME. GT2008, Volume 7: Education; Industrial and Cogeneration; Marine; Oil and Gas Applications, 11-21, June 9–13, 2008
Publisher: American Society of Mechanical Engineers
Paper No: GT2008-50172
https://doi.org/10.1115/GT2008-50172
View Paper titled, Ten Years of Experience With a Small Jet Engine as a Support for Education
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Topics: Education, Jet engines, Engines, Students, Turbines, Chain, Combustion chambers, Compressors, Flow (Dynamics), Fuels
Proceedings Papers

Investigating Circumferential Non-Uniformities in Throughflow Calculations Using an Harmonic Reconstruction

J. P. Thomas, O. Le´onard
Proc. ASME. GT2008, Volume 6: Turbomachinery, Parts A, B, and C, 2229-2241, June 9–13, 2008
Publisher: American Society of Mechanical Engineers
Paper No: GT2008-50328
https://doi.org/10.1115/GT2008-50328
View Paper titled, Investigating Circumferential Non-Uniformities in Throughflow Calculations Using an Harmonic Reconstruction
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Topics: Blades, Computation, Design, Flow (Dynamics), Hoop stress, Simulation, Turbomachinery
Proceedings Papers

On the Role of the Deterministic and Circumferential Stresses in Throughflow Calculations

J.-F. Simon, O. Le´onard
Proc. ASME. GT2008, Volume 6: Turbomachinery, Parts A, B, and C, 2085-2099, June 9–13, 2008
Publisher: American Society of Mechanical Engineers
Paper No: GT2008-50119
https://doi.org/10.1115/GT2008-50119
View Paper titled, On the Role of the Deterministic and Circumferential Stresses in Throughflow Calculations
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Topics: Hoop stress, Blades, Flow (Dynamics), Stress, Navier-Stokes equations, Approximation, Compressors, Databases, Turbines, Turbulent diffusion
Proceedings Papers

On Inverse Problems in Turbine Engine Parameter Estimation

M. Henriksson, S. Borguet, O. Le´onard, T. Gro¨nstedt
Proc. ASME. GT2007, Volume 1: Turbo Expo 2007, 703-711, May 14–17, 2007
Publisher: American Society of Mechanical Engineers
Paper No: GT2007-27756
https://doi.org/10.1115/GT2007-27756
View Paper titled, On Inverse Problems in Turbine Engine Parameter Estimation
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Topics: Gas turbines, Inverse problems, Parameter estimation, Engines, Jet engines, Simulation results, Turbojets
Proceedings Papers

A Sensor-Fault-Tolerant Diagnosis Tool Based on a Quadratic Programming Approach

S. Borguet, O. Le´onard
Proc. ASME. GT2007, Volume 1: Turbo Expo 2007, 585-594, May 14–17, 2007
Publisher: American Society of Mechanical Engineers
Paper No: GT2007-27324
https://doi.org/10.1115/GT2007-27324
View Paper titled, A Sensor-Fault-Tolerant Diagnosis Tool Based on a Quadratic Programming Approach
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Topics: Quadratic programming, Sensors, Gas turbines, Algorithms, Engines, Flaw detection, Instrumentation, Jet engines, Kalman filters, Robustness
Proceedings Papers

On-Line Aircraft Engine Diagnostic Using a Soft-Constrained Kalman Filter

P. Dewallef, O. Le´onard, K. Mathioudakis
Proc. ASME. GT2004, Volume 2: Turbo Expo 2004, 585-594, June 14–17, 2004
Publisher: American Society of Mechanical Engineers
Paper No: GT2004-53539
https://doi.org/10.1115/GT2004-53539
View Paper titled, On-Line Aircraft Engine Diagnostic Using a Soft-Constrained Kalman Filter
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Topics: Aircraft engines, Algorithms, Engines, Filtration, Kalman filters, Redundancy (Engineering), Stability, Steady state, Turbofans
Proceedings Papers

Combining Classification Techniques With Kalman Filters for Aircraft Engine Diagnostics

P. Dewallef, C. Romessis, O. Le´onard, K. Mathioudakis
Proc. ASME. GT2004, Volume 2: Turbo Expo 2004, 595-603, June 14–17, 2004
Publisher: American Society of Mechanical Engineers
Paper No: GT2004-53541
https://doi.org/10.1115/GT2004-53541
View Paper titled, Combining Classification Techniques With Kalman Filters for Aircraft Engine Diagnostics
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Topics: Aircraft engines, Kalman filters, Algorithms, Turbofans
Proceedings Papers

On-Line Transient Engine Diagnostics in a Kalman Filtering Framework

S. Borguet, P. Dewallef, O. Le´onard
Proc. ASME. GT2005, Volume 1: Turbo Expo 2005, 473-481, June 6–9, 2005
Publisher: American Society of Mechanical Engineers
Paper No: GT2005-68013
https://doi.org/10.1115/GT2005-68013
View Paper titled, On-Line Transient Engine Diagnostics in a Kalman Filtering Framework
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Topics: Engines, Filtration, Transients (Dynamics), Steady state, Flight, Aircraft, Aircraft propulsion, Gas turbines, Turbofans
Proceedings Papers

A Way to Deal With Model-Plant Mismatch for a Reliable Diagnosis in Transient Operation

S. Borguet, P. Dewallef, O. Le´onard
Proc. ASME. GT2006, Volume 2: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Controls, Diagnostics and Instrumentation; Environmental and Regulatory Affairs, 593-602, May 8–11, 2006
Publisher: American Society of Mechanical Engineers
Paper No: GT2006-90412
https://doi.org/10.1115/GT2006-90412
View Paper titled, A Way to Deal With Model-Plant Mismatch for a Reliable Diagnosis in Transient Operation
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Topics: Transients (Dynamics), Kalman filters, Gas turbines, Errors, Turbofans
Journal Articles

Design Method for Subsonic and Transonic Cascade With Prescribed Mach Number Distribution

O. Le´onard, R. A. Van den Braembussche
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. July 1992, 114(3): 553–560.
https://doi.org/10.1115/1.2929179
Published Online: July 1, 1992
View Article titled, Design Method for Subsonic and Transonic Cascade With Prescribed Mach Number Distribution
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Topics: Cascades (Fluid dynamics), Design methodology, Mach number, Blades, Flow (Dynamics), Geometry, Pressure, Design, Boundary-value problems, Shapes