摘要:

Algebraic algorithms are presented which may be used to obtain the bounds of the feedback gains K of a discrete-time feedback system for root clustering in subregions of a unit circle in the Z plane. The design method, which is simple and straightforward, is robust in the sense that characteristic values are designed to cluster inside the desired subregion, even though the parameters vary within a given interval. Examples are included for illustration.

ISSN:0020-7721    

DOI:10.1080/00207728708963953

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Function discrimination via EMG parameter identification has been employed for controlling electrical stimulation of paralyzed nerves to provide paraplegics with certain walking functions. In this case, large amounts of voluntary EMG data from muscles above the level of paralysis have to be processed in order to discriminate four basic functions needed by the patient to perform the desired walking functions of sitting down, standing up, lifting the right leg and lifting the left leg. The purpose of this study is to extract from the observed data more significant information that may represent the basic functions and to discard less significant data. This will make the classification of functions more efficient. The authors discuss the Karhunen-Loéve expansion and its application to this feature, which motivates an algorithm.

ISSN:0020-7721    

DOI:10.1080/00207728708963954

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

An exploratory study of the marble industry of Rajasthan, India is made. The major problems facing the industry are identified. A mixed-integer programming model is developed considering geological, environmental, mining technology and employment and demand characteristics with a view to deciding on an optimal mix of marble mining techniques and their goal levels for a given increment in demand. Decision graphs are developed to help decide the number of mines of each type to be opened for a particular reserve with the characteristics outlined above. Sensitivity analyses are carried out.

ISSN:0020-7721    

DOI:10.1080/00207728708963955

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

An approach based on the exact augmented lagrangian function is developed for the optimization of large-scale systems composed of interconnected units. The decomposition and coordination strategies are examined and various schemes of upper-level coordination are proposed, all of which are formulated as unconstrained quadratic minimization problems. Convergence analysis is performed exploiting an analogy with minimization by relaxation methods. Numerical examples are reported.

ISSN:0020-7721    

DOI:10.1080/00207728708963956

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The most commonly employed feedback algorithms for the control of industrial plants are those of the P, PI and PID regulators. In this paper, the procedure for decentralized (local) P, PI and PID regulators for multivariable plants optimal with respect to the overall system performance is developed. It is assumed that the type of each regulator is defined a priori and, in the case of PI and PID control laws, the state space of the corresponding subsystem is extended to include the dynamics of the local feedback regulator. The implementation of the procedure is based on optimal structurally constrained state feedback design with respect to the extended quadratic performance criterion.

ISSN:0020-7721    

DOI:10.1080/00207728708963957

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The design of experiments for the identification of non-linear systems is discussed. In open-loop operation the optimum input for a completely unknown non-linear system is derived and practical rules to be followed in closed-loop operation are described. It is shown that the use of PRBS inputs to excite non-linear systems can cause loss of identinability. The results are illustrated by simulated examples.

ISSN:0020-7721    

DOI:10.1080/00207728708963958

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

This paper rebuts Loehle's correspondence entitled ‘Hirata's stability analysis refuted’. His criticism is that the model and analysis of Hirata are void of meaning because materially-closed ecological systems are not ecologically realistic. This paper demonstrates that his criticism is irrelevant by showing several realistic materially-closed ecosystems and by pointing out the important tradition of research on such systems.

ISSN:0020-7721    

DOI:10.1080/00207728708963959

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor