Architecture Modeling - SPES 2020

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Architecture Modeling Figure 5.2: Operational Perspective – Abstraction Level 1 – Top Level Operational and Functional Perspective The intention of the operational perspective (as introduced in Section 3.2.1) is to model the interaction of different actors with the system under development using (operational) activities. The top level component of the operational perspective of the Aircraft Level is depicted in Figure 5.2. It shows a component systemcontext which contains the system under development, that is Aircraft here, and all actors that interact with this system. In this simple example we have just one actor namely the Pilot. This actor interacts with the system via different ports e.g. to control the thrust-reverser or the landing gear. Figure 5.3: Operational Perspective – Aircraft Level – Aircraft Having a closer look into the Aircraft system in Figure 5.3 shows a main activity named DecelerateOnGround. This complex activity offers different ways to decelerate the aircraft on the ground. This is expressed by a further decomposition of this activity into subactivities shown in Figure 5.4. First, there is the need to extend the landing gear before landing which is represented by the activity ControlLandingGear. Furthermore, the forward thrust need to be removed to reduce speed before touching down (RemoveForwardThrust). The activities that model the actual braking process are the primary and secondary stopping force. 74/ 156
Architecture Modeling Figure 5.4: Operational Perspective – Aircraft Level – Decelerate on ground Here, the primary stopping force (ControlPrimaryStoppingForce) is realized by the wheel brake system which is controlled by brake pedals. The secondary stopping force (ControlSecondaryStoppingForce) is implemented by a thrust-reverser. The activity DecelerateOnGround is annotated with a system requirement ARP-ACFT-R-0009 which asks for the existence of such a functionality. By this means, it is documented that this requirement is realized by this activity. Figure 5.5: Functional Perspective – Aircraft Level In the functional perspective (as introduced in Section 3.2.2) of the Aircraft Level shown in Figure 5.5, the user-demands from the operational perspective are depicted as top level functions and decomposed into finer grained subfunctions proposing how these functions should be 75/ 156
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Architecture Modeling ∗ Andreas B
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Contents 1 Introduction 1 2 Quick-T
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1 Introduction This document propos
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Architecture Modeling allowing to m
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Architecture Modeling creating a vi
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Architecture Modeling the design it
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Architecture Modeling of the logica
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Architecture Modeling realization o
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Architecture Modeling can usually o
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3 The Architecture Meta-Model In Se
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Abstraction-Levels (detail increase
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3.2.2 Functional Perspective Archit
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Architecture Modeling The semantics
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e3 && (clk==0) e1 idle pre e1 idle
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Pattern whenever event occurs condi
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If the brake force is above 80% for
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Pattern S3: Failure shall not be ca
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Pattern S9: failureCondition failur
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Pattern R2: Event occurs each perio
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idle e1 |clk:=0 e2 && (l
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The function : allocates a singl
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Architecture Modeling Traces accord
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Architecture Modeling Definition 6.
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Architecture Modeling the one given
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Architecture Modeling Decomposition
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Bibliography [1] ARINC 653 - Avioni
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Architecture Modeling [26] Holger G
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Architecture Modeling - SPES 2020

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