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There are three basic techniques commonly employed to extract data from an undersea sensor: 1. via a fixed wired link to a surface expression. 2. via a pop-up buoy, usually incorporating an RF link. 3. via wireless undersea communications. We suggest that the first is impractical in deep or rough conditions (consider the recent oil platform disaster in the Gulf of Mexico). The second consumes considerable...
The characterization of a data cluster representing a certain process behavior is achieved by developing steady-state nonlinear modeling of one or more critical signals as a function of other process variables in the system. This prediction model is used to detect either sensor maloperation or process anomaly by comparing the prediction and measurement of the same variable. A large database from a...
Aircraft maintenance has, since its conception, relied primarily on two methods of fault detection and isolation: 1) in-flight observation and reporting by flight personnel 2) ground operation or testing of airborne systems and equipment. Both methods, even when combined to the optimum, are not always sufficient to pinpoint the exact cause of trouble or locate a defective component. A third method,...
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