Towards a model driven Modelica IDE

Linköping Electronic Conference Proceedings

et al. 2014

Self Cite

The OneWind R Modelica Library 1 [15] for coupled wind turbine loads calculation developed at Fraunhofer IWES uses a structural element based on a modal reduction method to model the motion and deformation of flexible wind turbine rotor blades and tower. The degrees of freedom (DOF) are rigid body motions and modal DOF. The ModalElement model allows the simulation of coupling effects like bend-twist coupling in wind turbine rotor blades and the structural behavior is dependent on the selected eigenmodes. This paper gives an overview about the Modelica implementation of the theory of modal elements, the advantages over other methods (finite-elements), how the ModalElement model is included into the OneWind R Modelica Library, and how it is used for load calculation.

Section: Onewind R Modelica Library With Onemodelicamentioning

confidence: 99%

The OneWind Modelica Library for Wind Turbine Simulation with Flexible Structure - Modal Reduction Method in Modelica

Thomas

Xin

Linköping Electronic Conference Proceedings

et al. 2014

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“…For the denition of wind turbine metamodels and models we use editors available with EMF and textual editors that are provided by and generated with the metamodeling tool Xtext 7 . This includes the denition of a grammar for the textual language Modelica [8].…”

Section: Related Workmentioning

confidence: 99%

“…If an error occurs while querying a model, an empty set of roles is returned. Possible errors include a query receiving an object that is not of type String, or a referenced object that does not exist 5 The implementation of validation rules for Modelica models as described in [8,13] showed that queries need a lot of overhead for type checking and null pointer checks. and thus would lead to a potential Null pointer access.…”

Section: Querying Roles From Context Objectsmentioning

confidence: 99%

See 1 more Smart Citation

Semantic validation of physical models using role models

Fritzson

2015

SIMULATION

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The complexity of models for the simulation of physical systems is steadily increasing. This makes the eective validation of models for dierent design aspects crucial. One of the many important aspects is the structural correctness and the behavior due to design parameters which are of particular concern for the modeling of wind turbines.This article presents a design and implementation of a role-based validation framework. The framework allows for the creation of validation rules for dierent design aspects. This is done by role models that are used to dene restrictions for an aspect by roles and rules. Multiple role models can be combined to cover all design features during model development. Restrictions on how models can interact with each other can be dened, which broadens language specic restriction capabilities. The resulting rules can then be tested on arbitrary models based on the Eclipse Modeling Framework, for which mapping between elements of the role model and elements of the validated modeling language must be provided.In the domain of wind turbines, this approach is evaluated by application to two kinds of modeling languages (Modelica and UML2). Role models and rules have shown to be easily described with the framework's role model language and role model denitions are successfully re-used by the denition of mappings for both kinds of modeling languages.

“…Through the grammar definition textual editors that developers can use to define models using the language are automatically generated. The editors recognize syntax errors and the IDE can check additional Well-Formedness Rules (WFR) on the user defined models [16] in order to assist the developer in creating correct code.…”

Section: Concrete Syntax Definitionmentioning

confidence: 99%

Modelica Code Generation with Polymorphic Arrays and Records Used in Wind Turbine Modeling

Linköping Electronic Conference Proceedings

Fritzson

Zuga

et al. 2012

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At Fraunhofer Institute for Wind Energy and Energy System Technology IWES a simulation software for offshore wind farms is being developed, concentrating on the ability to define physical models at different levels of detail. Therefore parameterizable models representing parts of wind turbines are defined that can be transformed for various purposes like simulation with Finite Element Method (FEM) tools or Modelica solvers.This paper describes the concepts of purely parametric physical models and code generation. It is elucidated how models of different complexity can be transformed into each other by model driven development techniques. Thereby the focus is set on the generation of Modelica code and it is explained how the use of Modelica libraries simplifies the generation of simulatable code.During the development of generators for Modelica, issues arose regarding type compatibility of arrays with different sizes when using polymorphism. These issues are explained by an example and possible enhancements for the Modelica language are suggested.