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SysML-based Reference Models for Fluid Power Components

SysML-based Reference Models for Fluid Power Components. Chris Paredis, Raphael Kobi Product & Systems Lifecycle Management (PSLM) Center Systems Realization Laboratory G.W. Woodruff School of Mechanical Engineering Georgia Institute of Technology. December 6, 2005

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SysML-based Reference Models for Fluid Power Components

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  1. SysML-based Reference Models for Fluid Power Components Chris Paredis, Raphael Kobi Product & Systems Lifecycle Management (PSLM) Center Systems Realization Laboratory G.W. Woodruff School of Mechanical Engineering Georgia Institute of Technology December 6, 2005 www.srl.gatech.edu www.pslm.gatech.edu

  2. Reference Models for Fluid Power Components • Aim: • To organize knowledge about fluid power components into standardized, reusable and extensible models • To develop methods for (re-)using this knowledge in support of the design of fluid power systems • Method: • Define an ontology for describing fluid power components and systems • Define reference models as standardized containers that include knowledge and information about the form, function and behavior of components • Formalize the ontology and reference models in SysML • Create semantic mappings between SysML and authoring and analysis tools

  3. Initial Focus: Wrapping Modelica Models • Make wrappers of Modelica models available in SysML so that they can be used to create models of new systems • Not the intent to replace Modelica authoring tools (e.g., Dymola) • To use Modelica models, only the interface needs to be available • Includes: Modelica connectors + parameters • Modelica connectors  SysML InternalProperty • Modelica parameters  SysML public value • Note: "parameter" denotes a quantity that remains constant for the duration of a simulation • Other model info is included for completeness • But no semantics – unstructured text

  4. Semantic Mapping: SysML <=> Modelica • Modelica is object oriented  many concepts map directly to SysML • Examples: • Modelica class  SysML class • Modelica model SysML block • Modelica partial class  SysML abstract class • But some mismatches due to richer Modelica semantics • Special types of classes: model, record, block, connector, type, package, function • encapsulated class ?? • Modelica Real has attributes: unit, quantity, displayUnit, nominal, fixed, start, min, max, … • …

  5. Approach: Modelica Profile Extend Semantics of SysML classes Extends Association Semantics Extend Semantics of SysML Types Note: work in progress…feedback welcome

  6. SysML versions of Modelica Libraries Use Modelica Profile to Define the Interfacesof Models in Modelica Libraries Note: work in progress…

  7. [… internal definition of ConMot…] Example: Hydraulic Motor The connectors are defined in this parent model parameters are quantities that remain constant during a simulation, and are publicly accessible

  8. Modelica (Dymola) SysML (Artisan) Example: Hydraulic Motor (NOTE: We have been using Artisan RTS SysML v0.9)

  9. Example: Using Motor in Hydraulic Circuit model VerticalLifter HyLibLight.Pumps.Tank tank; HyLibLight.Pumps.ConMot motor; HyLibLight.Pumps.Basic.IdFlowSource source; equation connect(tank.port_A, motor.port_B); connect(motor.port_A, source.port_B); end VerticalLifter; Automatically GeneratedModelica Model

  10. Next Steps • Get feedback from SysML community on semantic mapping • Expand the semantic mapping for • Implement / modify the mapping for updated SysML spec • We will wait for update of spec in Artisan RTS • Implement tool for automatically mapping Modelica XML libraries into SysML wrappers

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