When developing a system, it is also common to find a description of the physical components. So we can build a functional architecture that displays several levels of functions as illustrated below: Some of the top-level functions are still complex and need to be refined through lower-level functions. Practically, this diagram displays the usage of the functions in their operational context (SysML part properties typed by the previously mentioned blocks), the interfaces (connectors with item flows) between the SOI and the other members of the system context, and the interfaces between usages of functions (also connectors with item flows).Ī possible functional architecture for the identified top-level functions is provided below: We use an IBD to formalize the functional architecture. The definition of these functions is formalized with Blocks in SysML. Build fight plan relative to aircraft type.The drone system contains 9 top-level functions: AIDA provides assistance during the inspection of an aircraft before flights: the drone seeks for Aircraft defects. ĪIDA stands for “Aircrat Inspection by Drone Assistant”. This architecture formalizes an arrangement of system functions using two viewpoints: the Functional Breakdown Structure (FBS), which shows the decomposition hierarchy as a tree ( “parent” functions and “child” functions) and the connection graph that shows the functional flows between those functions (energy, information, matter).Īs an illustration, let us take the AIDA open-source sample case from the Saint Exupery Technological Research Institute in Toulouse. In most industrial practices, and in various industrial domains, systems engineers are used to define one (and sometimes several) functional architecture(s). We discuss the following questions: Why do we need a logical architecture? And how do we ensure the consistency between the functional and logical architecture? To enforce ordering of an evaluation, sequencing constraints may be specified among clauses.This fourth article deals with functional and logical architectures. The result may therefore be nondeterministic if more than one test section can be true concurrently. In general, a test section may be executed in any order, including simultaneously if the underlying execution architecture supports it. ![]() If no test section yields a true value, then no body section is executed this may be a semantic error if output values are expected from the conditional node.
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