A Consistent Preliminary Design Process for Mechatronic Systems - Simulation and Modeling Methodologies, Technologies and Application - page 98

3 A Preliminary Design Process

The proposed preliminary design process relies on a methodology that deals with
different modelling, (SysML model, topological model) in order to provide consistent
equations for an optimisation of the mechatronic system with interval analysis.

3.1

Modelling of the Power Lift Gate System with SysML

We propose a modelling of a power lift gate system by means of appropriate SysML
models at the early stages of the technical engineering process. The different SysML
diagrams make it possible for engineers from various disciplinary fields to share a
common view about the system. First, we create an extended context diagram, in
order to present the different interactions between the extended system (Lift gate with
Electric cylinder) and its environment (Fig. 3).
Then a Use Case Diagram is defined to describe the system services (Fig. 4).

Fig. 3. Extended context diagram of the power lift gate system

SysML Requirement Diagram can be used to clearly organize user and derived
system requirements (Fig. 5). By using a hierarchical representation of the require-
ments, clear gains can be made in the elaboration of requirements, in tradeoffs, as
well as in the validation and the verification of requirements. Indeed, during design
activities, verification activities need to be defined to satisfy system constraints and
properties. Links between the Requirements Diagram and other models allow engi-
neers to connect test criteria to test cases used throughout the development process.