ABZ 2014: The Landing Gear Case Study: Case Study Track, by Frédéric Boniol, Virginie Wiels, Yamine Ait Ameur,

By Frédéric Boniol, Virginie Wiels, Yamine Ait Ameur, Klaus-Dieter Schewe (eds.)

This quantity comprises complaints of the Case research tune, held on the 4th overseas convention, ABZ 2014, in Toulouse, France, in June 2014. The eleven papers awarded have been rigorously reviewed and chosen from various submissions. They use various formal recommendations: B, ASM, Fiacre. in addition they suggest other kinds of verification akin to facts, version checking, try out iteration, run-time tracking, and simulation.

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Extra info for ABZ 2014: The Landing Gear Case Study: Case Study Track, Held at the 4th International Conference on Abstract State Machines, Alloy, B, TLA, VDM, and Z, Toulouse, France, June 2-6, 2014. Proceedings

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Any modification in the state of these devices takes a certain time. As a consequence, we always consider two environment events for such modifications: that is a “begin modification” and “end modification”. More precisely, we have events “beg_prs”, “end_prs” (for hydraulic circuit pressurization), “beg_opn”, “end_opn” (for door opening), etc. Events “begin modification” are initiated by the software stimulating some electro-valves: general_EV, open_EV, retract_EV, extend_EV, or closed_EV. When an environment event “end modification” occurs (always after the occurrence of a corresponding “begin modification” event), the environment sends an information to the software, which can then stimulate the next electro-valve, and so on.

Fr Abstract. This paper describes the modeling, done using the Event-B notation, of the aircraft landing gear case study that is proposed in a special track of the ABZ’2014 Conference. In the course of our development, we discovered some problems in our initial modeling approach. This has led us to propose a second approach and then a third one. Each approach is more efficient than the previous one in terms of proof obligations (roughly speaking: 2000, 1000, 500). All this will be described in this paper.

And sequences i0 i1 . . , j0 j1 . . such that i0 j0 0 and Sik Sj¦k for each k and either – both runs terminate and their final states are the last pair of equivalent states; or – both runs and both sequences i0 i1 . . , j0 j1 . . are infinite. The states Sik and Sj¦k are the corresponding states of interest. They represent the end points of the corresponding computation segments (those of interest) for which the equivalence is defined in terms of a relation between their corresponding locations (those of interest).

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