The authors propose an algorithm for self-organizing fuzzy modeling (SOFM) which models the system by learning rules from input and output data, even though the rule set is empty at the beginning. The concept of tunin...
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The authors propose an algorithm for self-organizing fuzzy modeling (SOFM) which models the system by learning rules from input and output data, even though the rule set is empty at the beginning. The concept of tuning the cut value and gain introduced to SOFM helps to model the system more accurately and quickly. The cut value, like a filter, can be used to prune unimportant data and decide suitable rules from data possibilities. The gain, like a scaling factor, can adjust membership functions to determine the fuzzy model sensitivity. Simulation of a nonlinear system has shown the fuzzy model obtained in this way to be satisfactory. Pseudorandom binary sequence and Gaussian random noise signals have been added to the system to validate the modeling robustness. Using these results, the design of a hierarchical self-organizing fuzzy logic control structure which will include modeling, control and fault detection, is being investigated.< >
Two methods for decentralized array processing are introduced. Both methods are shown to be statistically optimal in the sense that asymptotically they provide, under mild conditions, the most accurate decentralized e...
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Two methods for decentralized array processing are introduced. Both methods are shown to be statistically optimal in the sense that asymptotically they provide, under mild conditions, the most accurate decentralized estimates of source location parameters. The accuracy of the two decentralized methods is compared to the centralized Cramér-Rao bound, both analytically and numerically, in order to provide indications about the loss of accuracy associated with decentralized processing.
The asymptotic tracking properties of an adaptive notch filter with pole-zeros constraints for the cancellation or retrieval of multiple time-varying sine waves in additive noise are analyzed. The methods of Ljung and...
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The asymptotic tracking properties of an adaptive notch filter with pole-zeros constraints for the cancellation or retrieval of multiple time-varying sine waves in additive noise are analyzed. The methods of Ljung and Gunnarsson (see automatica, vol.26, no.1, p.7-21, Jan. 1990) are used in order to analyze the asymptotic mean-square parameter error, when the variations in the underlying frequencies and the gain of the algorithm are assumed to be sufficiently small. A closed-form expression for the mean square error (MSE) is derived as a function of the tuning variables of the algorithm. The results give insight into the operational properties of the algorithm and are used in order to minimize the MSE with respect to the tuning variables.< >
This paper treats the problem of on-line identification of systems with varying delay, based on measurements of the input and output signals. A discrete rational delay approximation is used in a process model. The loc...
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This paper treats the problem of on-line identification of systems with varying delay, based on measurements of the input and output signals. A discrete rational delay approximation is used in a process model. The local minima of a specified loss function are analysed and the choice of design variables is discussed. A simulation example of the identification of a system with variable delay is presented. Simulation results indicate that a model that includes a discrete delay approximation can successfully be used for estimation of both time-delay and dynamics of a system.
The estimation of sinusoidal frequencies by the overdetermined Yule-Walker (OYW) Method is considered. An explicit expression is derived for the asymptotic covariance matrix of the estimation errors. The effect of inc...
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The estimation of sinusoidal frequencies by the overdetermined Yule-Walker (OYW) Method is considered. An explicit expression is derived for the asymptotic covariance matrix of the estimation errors. The effect of increasing the number of Yule-Walker equations on estimation accuracy is analyzed. The asymptotic estimation accuracy of the OYW method is compared to the best achievable accuracy corresponding to the Cramér-Rao bound
The Kullback discrimination index can be used to test whether two models obtained from different data sets are equal or not. Such an index can be used for model validation, which then is carried out as a crossvalidati...
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The Kullback discrimination index can be used to test whether two models obtained from different data sets are equal or not. Such an index can be used for model validation, which then is carried out as a crossvalidation. However, the form of the index and its implementation differ from traditional crossvalidation. Some simple validation criteria are developed from this index, and also numerically illustrated.
作者：
LUEDEKE, GFARNHAM, RBJR.George Luedeke
Jr.: received his BS degree in Mechanical Engineering from Massachusetts Institute of Technology and his MS degree in Product Design from Illinois Institute of Technology. Early in his career Mr. Luedeke joined General Motors Corporation as a designer responsible for development of people mover and rail rapid transit systems. From 1964 to 1974 he was with Hughes Aircraft Company. At Hughes he performed analyses and developed designs for a wide variety of program and proposal efforts such as: High Speed Ground Transportation (DOT) Task Force Command Center (NAVY) Panama Canal Marine Traffic Control Center (Panama Canal Co.) Royal Iranian Navy Command Center (Iran) Tactical Information Processing and Interpretation Center (Air Force) and WALLEYE CONDOR and PHOENIX Missile Systems (NAVY). He also had marketing development responsibilities related to the diversification of Hughes resources in civil business areas such as: Automatic train control (WMATA BARTD SCRTD) water/sewage treatment plant automation (Santa Clara County) Aqueduct Control (SWR) Hydrometeorological data collection (BPA WMO) and Salton Sea basin systems analysis (Dept. of the Interior). He was responsible for combat system integration for the Hughes 2000T Surface Effect Ship (SES) proposal. He also conducted detailed studies concerning ship flexure for the Improved Point Defense Target Acquisition System Program and for the definition of operational High Energy Laser weapon installations on a series of conventional monohulls (DLG DD and CVN). Since 1974 Mr. Luedeke has been employed at RMI Inc. (formerly Rohr Marine Inc.). During this time he has held several positions. His responsibilities have included directing a number of studies on advanced SES concepts managing activities defining mission/cost effectiveness of military and commercial SES's including defining the operational benefits and enhanced survivability characteristics of cargo SES's for high speed military sealiftfor NA TO and Southeast Asia
This paper will present the results of a marketing, engineering, and economic analysis of advanced marine vehicles done by IMA Resources, Inc. and RMI, Inc., in support of a Maritime Administration project to study “...
This paper will present the results of a marketing, engineering, and economic analysis of advanced marine vehicles done by IMA Resources, Inc. and RMI, Inc., in support of a Maritime Administration project to study “Multimode Express Shipping”. The study was conducted in 1981 and examined the economic benefits of using advanced marine vehicles as express cargo vessels in domestic and international service. Commodity characteristics, desirable express carrier rates, and potential high payoff service and route alternatives were identified. Advanced marine vehicles were surveyed and sized to meet desirable deadweight and block speed objectives. The costs of operating these craft on a variety of trade routes were calculated using an advanced marine vehicle economic analysis program. Revenues, expenses, break-even, profit and loss, cash flow requirements, tax summary and economic indicators (i.e., cost/ton – mile, etc.) were projected over the expected life of the vehicles as was return on investment. Traffic density and market penetration considerations narrowed the field of choice to smaller sized advanced marine vehicle carriers (i.e., 50 and 250 ton deadweight) and to three international and five domestic routes.
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