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Aerodynamics and Fluid Mechanics Commons™
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Articles 1 - 5 of 5
Full-Text Articles in Aerodynamics and Fluid Mechanics
Analytic Confusion Matrix Bounds For Fault Detection And Isolation Using A Sum-Of-Squared-Residuals Approach, Daniel J. Simon, Donald L. Simon
Analytic Confusion Matrix Bounds For Fault Detection And Isolation Using A Sum-Of-Squared-Residuals Approach, Daniel J. Simon, Donald L. Simon
Electrical and Computer Engineering Faculty Publications
Given a system which can fail in 1 of n different ways, a fault detection and isolation (FDI) algorithm uses sensor data to determine which fault is the most likely to have occurred. The effectiveness of an FDI algorithm can be quantified by a confusion matrix, also called a diagnosis probability matrix, which indicates the probability that each fault is isolated given that each fault has occurred. Confusion matrices are often generated with simulation data, particularly for complex systems. In this paper, we perform FDI using sum-of-squared residuals (SSRs). We assume that the sensor residuals are s-independent and Gaussian, which …
Vibration Analysis Of A Split Path Gearbox, Timothy L. Krantz, Majid Rashidi
Vibration Analysis Of A Split Path Gearbox, Timothy L. Krantz, Majid Rashidi
Scholarship Collection
Split path gearboxes can be attractive alternatives to the common planetary designs for rotorcraft, but because they have seem little use, they are relatively high risk designs. To help reduce the risk of fielding a rotorcraft with a split path gearbox, the vibration and dynamic characteristics of such a gearbox were studied. A mathematical model was developed by using the Lagrangian method, and it was applied to study the effect of three design variables on the natural frequencies and vibration energy of the gearbox. The first design variable, shaft angle, had little influence on the natural frequencies. The second variable, …
Flow Diagnostics, Chemically Reacting Turbulent Flow Modeling And Turbulent Mixing : A Summary Of Project Studies In Combustion, Bahman Ghorashi
Flow Diagnostics, Chemically Reacting Turbulent Flow Modeling And Turbulent Mixing : A Summary Of Project Studies In Combustion, Bahman Ghorashi
Scholarship Collection
No abstract provided.
Simplified Jet-A Kinetic Mechanism For Combustor Application, Bahman Ghorashi, Chi-Ming Lee, Krishna Kundu
Simplified Jet-A Kinetic Mechanism For Combustor Application, Bahman Ghorashi, Chi-Ming Lee, Krishna Kundu
Scholarship Collection
Successful modeling of combustion and emissions in gas turbine engine combustors requires an adequate description of the reaction mechanism. For hydrocarbon oxidation, detailed mechanisms are only available for the simplest types of hydrocarbons such as methane, ethane, acetylene, and propane. These detailed mechanisms contain a large number of chemical species participating simultaneously in many elementary kinetic steps. Current computational fluid dynamic (CFD) models must include fuel vaporization, fuel-air mixing, chemical reactions, and complicated boundary geometries. To simulate these conditions a very sophisticated computer model is required, which requires large computer memory capacity and long run times. Therefore, gas turbine combustion …
Dynamics Of A Split Torque Helicopter Transmission, Majid Rashidi, Timothy Krantz
Dynamics Of A Split Torque Helicopter Transmission, Majid Rashidi, Timothy Krantz
Scholarship Collection
A high reduction ratio split torque gear train has been proposed as an alternative to a planetary configuration for the final stage of a helicopter transmission. A split torque design allows a high ratio of power-to-weight for the transmission. The design studied in this work includes a pivoting beam that acts to balance thrust loads produced by the helical gear meshes in each of two parallel power paths. When the thrust loads are balanced, the torque is split evenly. A mathematical model was developed to study the dynamics of the system. The effects of time varying gear mesh stiffness, static …