| 1. |
- Madala, Hemarao
(författare)
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GMDH as an identification and modelling tool for biotechnical processes
- 1983
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Ingår i: Elsevier IFAC Publications / IFAC Proceedings series. - 1474-6670. - 0080299784 ; 16:14, s. 225-229
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes GMDH as an identification and modelling tool for biotechnical processes. Several examples are considered by using a known simulated data. The identified models could be used further in analysing the processes by using online algorithms.
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| 2. |
- Madala, Hermano
(författare)
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Self-Organization GMDH Computer Aided Design for Modelling of Cyclic Processes
- 1983
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Ingår i: Elsevier IFAC Publications / IFAC Proceedings series. - 1474-6670. ; 16:19, s. 611-618
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Tidskriftsartikel (refereegranskat)abstract
- The Group Method Data Handling (GMDH) is a specific selforganization computer-aided design which has been proposed by Ivakhnenko (1970, 1971) and which has been described in several recent articles (Ivakhnenko et al, 1978, 1979a) and also in Soviet Automatic Control (USA). One of the several interesting properties of this CAD is its apparent ability to make high accuracy predictions of future states of complex systems. The development presents a procedure for constructing models in a simple and systematic way for complex systems which are cyclic in nature. In the present paper the structures of finite-difference models for cyclic processes are described. The criterion of prediction balance is used for analysing the optimal model. System of combined models constructed in this manner is used recursively for predicting the future states of the cyclic system. Three examples are given. One example used the data generated from a known model and the others the airtemperature data with large number of points and the tea-crop production data with less number of points. The system of combined models is compared with the single overall model. The former has given reasonably better results. The models are checked for stability in long-range actions.
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| 3. |
- Madala, Hemarao, et al.
(författare)
-
Some Experimental Results of Digital Signal Processing
- 1983
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Ingår i: Elsevier IFAC Publications / IFAC Proceedings series. - 1474-6670. ; 16:15, s. 531-535
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes some of the experimental results in processing of signals in finding out the length of a tube. The paper is divided into two parts consisting of different results. The aim of the first part is to find out the behaviour of A parameters of AR model and how they change as the length of the tube varies and to discover a single model of length as a function of A parameters treating the system as a black box. Linear Moving Averages (LMA) used in this paper eased the situation in filtering out the disturbances on A parameters and in getting the exact model. Optimal length of LMA is found out for the given situation. This type of model is useful in the continuous case. In the second part a new harmonical algorithm is described for identifying the signals from the experiment. The estimated models show reasonably good results. The results are discussed for different lengths of the tube.
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