Download Annals of Systems Research: Publikatie van de Systeemgroep by S. Cohen (auth.), B. van Rootselaar (eds.) PDF

By S. Cohen (auth.), B. van Rootselaar (eds.)

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N3 Rtk 1 / -Rvw /\ VSo oriented network graph v~ bondgraph The network graph shows that components are connected either in parallel or in series. Parallel means that 3 or more ports have the same across-variable; in series connection the')}' have the same through-variable. In the bond graph parallel is symbolized by a O-junction, series by a I-junction. All of the previously mentioned components appear: v- and /-sources (VS and FS), transformers and dissipators. Because none of these components stores energy, they all react immediately and the whole model reacts instantly: upon switching on the motor the waterflow is present.

J . j • . -....... ,,1/, ... , , .. / /~/; :. 12 sec later than it reaches the front wheel. Nevertheless there is an immediate movement of the rear wheel, due to the mass and moment of inertia of the body. 4. Conclusion As has been shown network graphs and bond graphs can represent the structure of a physical system in a compact and clear way. Even for simple examples, such as the 2-dimensional motion of a motorcar, it can be seen they compare favorably with other methods, such as the direct modeling by differential equations or the transfer function approach, both used, for example, in [15].

New York 1972. 15. , Strukturbilder von Automobil-Federungssystemen und ihre Behandlung am Analogrechner. VDI-Zeitschri/t 104 (Oct. 1962). ANALYTICAL METHODS IN INFORMATION SYSTEMS A. HOVAGUIMIAN Summary Recent research on the theory of Information Systems has given rise to a technique which we have called Activity Analysis. This technique is intended to provide the analyst/designer with a systematic method of analysing the structure of a system. This will enable him to check consistency, detect redundancy and simplify maintenance and modification of existing systems.

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