Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 128
Book Description
Automated Procedure for Developing Hybrid Computer Simulations of Turbofan Engines. Part 1: General Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 128
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 128
Book Description
Automated Procedure for Developing Hybrid Computer Simulations of Turbofan Engines
Author: John R. Szuch
Publisher:
ISBN:
Category :
Languages : en
Pages : 117
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 117
Book Description
Automated Procedure for Developing Hybrid Computer Simulations of Turbofan Engines
Author: John R. Szuch
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 132
Book Description
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 132
Book Description
NASA Technical Paper
Author:
Publisher:
ISBN:
Category : Astronautics
Languages : en
Pages : 724
Book Description
Publisher:
ISBN:
Category : Astronautics
Languages : en
Pages : 724
Book Description
NASA Scientific and Technical Publications
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 410
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 410
Book Description
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 456
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 456
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Monthly Catalogue, United States Public Documents
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1092
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1092
Book Description
NASA Technical Memorandum
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 310
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 310
Book Description
Monthly Catalog of United States Government Publications
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages :
Book Description
Kalman Filtering With Inequality Constraints for Turbofan Engine Health Estimation
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 38
Book Description
Kalman filters are often used to estimate the state variables of a dynamic system. However, in the application of Kalman filters some known signal information is often either ignored or dealt with heuristically. For instance, state variable constraints (which may be based on physical considerations) are often neglected because they do not fit easily into the structure of the Kalman filter. This paper develops two analytic methods of incorporating state variable inequality constraints in the Kalman filter. The first method is a general technique of using hard constraints to enforce inequalities on the state variable estimates. The resultant filter is a combination of a standard Kalman filter and a quadratic programming problem. The second method uses soft constraints to estimate state variables that are known to vary slowly with time. (Soft constraints are constraints that are required to be approximately satis- fied rather than exactly satisfied.) The incorporation of state variable constraints increases the computational effort of the filter but significantly improves its estima- tion accuracy. The improvement is proven theoretically and shown via simulation results. The use of the algorithm is demonstrated on a linearized simulation of a turbofan engine to estimate health parameters. The turbofan engine model con- tains 16 state variables, 12 measurements, and 8 component health parameters. It is shown that the new algorithms provide improved performance in this example over unconstrained Kalman filtering.
Publisher:
ISBN:
Category :
Languages : en
Pages : 38
Book Description
Kalman filters are often used to estimate the state variables of a dynamic system. However, in the application of Kalman filters some known signal information is often either ignored or dealt with heuristically. For instance, state variable constraints (which may be based on physical considerations) are often neglected because they do not fit easily into the structure of the Kalman filter. This paper develops two analytic methods of incorporating state variable inequality constraints in the Kalman filter. The first method is a general technique of using hard constraints to enforce inequalities on the state variable estimates. The resultant filter is a combination of a standard Kalman filter and a quadratic programming problem. The second method uses soft constraints to estimate state variables that are known to vary slowly with time. (Soft constraints are constraints that are required to be approximately satis- fied rather than exactly satisfied.) The incorporation of state variable constraints increases the computational effort of the filter but significantly improves its estima- tion accuracy. The improvement is proven theoretically and shown via simulation results. The use of the algorithm is demonstrated on a linearized simulation of a turbofan engine to estimate health parameters. The turbofan engine model con- tains 16 state variables, 12 measurements, and 8 component health parameters. It is shown that the new algorithms provide improved performance in this example over unconstrained Kalman filtering.