By Thomas Ball, Byron Cook, Vladimir Levin, Sriram K. Rajamani (auth.), Eerke A. Boiten, John Derrick, Graeme Smith (eds.)
The fourth convention within the sequence of foreign conferences on built-in F- mal tools, IFM, used to be held in Canterbury, united kingdom, 4–7 April 2004. The convention was once geared up by way of the Computing Laboratory on the college of Kent, whose major campus is simply outdoor the traditional city of Canterbury, a part of the county of Kent. Kent is located within the southeast of britain, and the collage sits on a hill overlooking the town of Canterbury and its world-renowned cathedral. The UniversityofKentwasgranteditsRoyalCharterin1965.Todaytherearealmost 10,000 full-time and part-time scholars, with over a hundred and ten nationalities represented. The IFM conferences have confirmed to be really profitable. The ?rst m- ting used to be held in York in 1999, and to that end we held occasions in Germany in 2000, after which Finland in 2002. The meetings are held each 18 months or so, and allure quite a lot of individuals from Europe, the Americas, Asia and Australia. The convention is now ?rmly a part of the formal equipment convention calendar. The convention has additionally advanced by way of subject matters and matters - provided, and this 12 months, in keeping with the topic as an entire, we observed extra paintings on veri?cation as a few of the demanding situations during this topic are being met. The paintings pronounced at IFM meetings will be visible as a part of the try and deal with complexity by way of combining paradigms of speci?cation and layout, in order that the main applicable layout instruments are used at di?erent issues within the life-cycle.
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Extra resources for Integrated Formal Methods: 4th International Conference, IFM 2004, Cnaterbury, UK, April 4-7, 2004. Proceedings
Sagiv. Precise interprocedural dataflow analysis via graph reachability. In POPL 95: Principles of Programming Languages, pages 49–61. ACM, 1995. F. Somenzi. Colorado university decision diagram package. edu/pub, University of Colorado, Boulder, 1998. M. Sharir and A. Pnueli. Two approaches to interprocedural data flow analysis. In Program Flow Analysis: Theory and Applications, pages 189– 233. Prentice-Hall, 1981. Design Verification for Control Engineering Richard J. uk 2 University of St Andrews Abstract.
Thus for example the HIRM rudder actuator has transfer function The behaviour under particular inputs is often represented graphically. For simplicity we describe only the “frequency response” analysis of such a system via Nichols plots. If a sine wave is input to a stable system it can be shown that the steady state output will also be a sine wave, of the same frequency as the input, but with different phase and amplitude. The difference between the output and input phases is called the “phase margin”, and ratio of the output to the input amplitudes is called the “gain margin”, that is Thus a simple evaluation criterion for a design requirement might take the form Phase margin greater than 40 degrees Gain margin of G greater than 20 dB Design Verification for Control Engineering 27 The Nichols plot of G allows us to express more complex design requirements.
We shall see below how some of the control requirements of fighter aircraft are specified in terms of acceptable paths in this plot . In practice man-made control systems are typically digital embedded software systems, which use sampled, rather than continuous time. These can be Design Verification for Control Engineering 23 modelled as discrete dynamical systems (difference equations), which again admit a transform representation via the z-transform, and an analogous state-space representation, investigated as before using matrix algebra.
Integrated Formal Methods: 4th International Conference, IFM 2004, Cnaterbury, UK, April 4-7, 2004. Proceedings by Thomas Ball, Byron Cook, Vladimir Levin, Sriram K. Rajamani (auth.), Eerke A. Boiten, John Derrick, Graeme Smith (eds.)