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K McGlinn, M Weise, H Wicaksono

Towards a shared use case repository - the swimming initiative started in the framework of the EU H2020 R&DI programme

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Series: w78:2016 (browse)
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M Weise & P Katranuschkov

Supporting State-based Transactions in Collaborative Product Modelling Environments

Abstract: The up to date state and the consistency of shared building model data are of utmost importance for the achievement of efficient model-based collaborative work. However, in engineering design these are not easy tasks. Design activities are typically carried out in long transactions that are characterized by the following three subtasks: check-out of the needed design data into a private workspace, making design changes within the private workspace, and check-in of a new model state into the shared model repository to make changes and decisions visible to the other designers. As a result of various existing semantic interoperability problems, in the new model state both actual design changes and data loss have to be considered that cannot be easily distinguished. To help tackle these problems we suggest a delta-based versioning approach whose essence is in storing design changes instead of complete design states. This approach is then used as basis to support the three data processing stages of a design step within a collaborative work environment, namely (1) creation of the needed and manageable model subset by removing all irrelevant design data, (2) storing the design changes, and (3) restoring the removed data by an ""undo"" operation of the first step. In the paper we present the used semantics for describing design changes, their transformation to deltas and the scope and limits of the suggested undo operation. At the end we provide an example of the use of the suggested approach with the industry standard IFC model and discuss its potential and needed further research.""

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Full text: content.pdf (623,331 bytes) (available to registered users only)

Series: w78:2005 (browse)
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Permission to reproduce these papers has been graciously provided by the Technische Universitšt Dresden.


M. Weise, T. Liebich, J. Tulke & P. Bonsma

IFC Support for Model-based Scheduling

Abstract: Model-based scheduling is about linking information from three yet separated domains; (1) architectural design, (2) construction scheduling and (3) cost management & quantity take-off. It thus will benefit from the Building Information Modeling (BIM) approach followed by the international buildingSMART initiative and its product the IFC data model specification. On the basis of a novel rule-based linking approach, which is shortly explained in the beginning, the paper provides an overview of the work that has been done to apply the linking approach in conjunction with the IFC 2x3 release and available IFC-enabled design applications. The paper gives insights into the capabilities but also the gaps of IFC. However, the paper is not going into technical details, which are provided in a separate, freely available discussion paper. Instead it shows the way from the requirements definitions, to the gap analysis, suggested extensions and prototype implementations, namely the Scheduling Assistant and the IFC-interface plug-in for MS Project. It finally discusses the current status of our developments and gives an outlook for further developments within the European Research and Development project InPro, an Integrated Project under the 6th framework program that has supported this work.

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Full text: content.pdf (1,344,077 bytes) (available to registered users only)

Series: w78:2009 (browse)
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P Katranuschkov, R J Scherer, M Weise, T Liebich

Extending BIM for Energy Simulation and Design Tasks

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Full text: content.pdf (157,736 bytes) (available to registered users only)

Series: w78:2014 (browse)
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Peter Katranuschkov, Matthias Weise, Ronny Windisch, Sebastian Fuchs, Raimar J. Scherer

BIM-Based Generation of Multi-Model Views

Abstract: Building information modelling (BIM) introduces a new work paradigm that enables improved interoperability and better coordination of AEC processes. The current IFC standard provides an excellent core reference model for that purpose, together with a growing number of supporting domain extensions. However, generation of task-specific model views from a general-purpose BIM is still a difficult problem. Efforts related to the development of an Information Delivery Manual (IDM) and Model View Definitions (MVD) suggest solutions but reveal also gaps that need to be overcome. This includes: (1) more flexible tool-supported specification of domain model views, (2) mechanisms for generation of (ad-hoc) views on object instance level, and (3) multi-model views, combining BIM data with data from other (non BIM) models, such as costs, equipment, supply chain etc. nD-modelling, extending BIM, only partially gives answers to these issues.In this paper we describe a new approach for the generation of multi-model views that meets the above requirements. It is based on the use of an open IFC toolset developed at the University of Weimar and a formal model subset definition schema (GMSD) initially developed by two of the authors. With GMSD and an associated editing tool it is possible to define arbitrary model views on class level, including a subset of IFC classes, attribute constraints (such as wall thickness > 14cm) as well as partial or full tracing of the object relationships. We extend these definitions on instance level by applying a set of geometric, topological and semantic queries that are resolved at runtime. Moreover, using XML schema based representations we provide for simultaneous import of BIM and non BIM data that can be queried, selected and filtered via harmonised cross-model requests. With the same approach, comparison or merging of BIM model views is also possible.

Keywords: BIM, IFC, model filtering, multi-model views, BuildingSMART

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Full text: content.pdf (416,067 bytes) (available to registered users only)

Series: w78:2010 (browse)
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Raimar J. Scherer, Matthias Weise and Peter Katranuschkov

Adaptable Views Supporting Long Transactions In Concurrent Engineering

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Series: w78:2006 (browse)
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Weise M, Katranuschkov P, Scherer R J

Generalised model subset definition schema

Abstract: The idea of a shared product data repository that can be efficiently used in distributed concurrent engineering environments takes practical shape with the ripening of the IFC platform. However, structured methods for defining and deriving different partial model views that can easily be used by domain-specific applications are not yet available. This paper presents a generalised model subset definition schema (GMSD) which tackles many issues related to partial model retrieval and the use of domain-specific views. The schema, defined in EXPRESS for consistence with the IFC project model, contains two subparts: (1) constructs supporting the dynamic selection of object instances in model server queries, and (2) constructs enabling the development of view definitions that can be used as permanent part of a model server environment, to support the automated derivation of discipline-specific model subsets for architectural or structural design, facilities management etc. Discussed are the requirements that have governed the development of GMSD, its basic concepts, a prototype server/client implementation and first test-bed results. The latter indicate the great potential of the suggested structured approach for the definition of appropriate model subsets to improve the amount and quality of the exchanged data between actors and applications.

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Full text: content.pdf (341,730 bytes) (available to registered users only)

Series: w78:2003 (browse)
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Permission to reproduce these papers has been graciously provided by the University of Auckland. The assistance of the editor who provided the full texts and the structured metadata, Dr. Robert Amor, is gratefully appreciated.


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