Model-based definition: Difference between revisions

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'''Model-based definition''' ('''MBD'''), sometimes called '''digital product definition''' ('''DPD'''), is the practice of using [[3D modeling|3D models]] (such as [[solid model]]s, 3D [[Product and manufacturing information|PMI]] and associated metadata) within 3D [[computer-aided drafting|CAD]] software to define (provide specifications for) individual components and product assemblies. The types of information included are [[geometric dimensioning and tolerancing]] (GD&T), component level materials, assembly level [[bill of materials|bills of materials]], engineering configurations, design intent, etc. By contrast, other methodologies have historically required accompanying use of 2D [[engineering drawing]]s to provide such details.<ref>[http://model-based-enterprise.org/Docs/MIL-STD-31000A%20released%20on%20ASSIST%203%2013%202013.pdf "MIL-STD-31000 Rev A"], p36, 26 February 2013. Retrieved on 23 April 2015.</ref>

[[File:MBD (Model-Based Definition) Kompas 3d STEP AP242.png|alt=STEP AP242 files are most commonly used in manufacturing because they contain a large amount of information in a relatively small file size.|thumb|424x424px|'''MBD (Model-Based Definition) Kompas 3d STEP AP242''']]

==Use of the 3D digital data set==

[[File:QIF 3.0 contains PMI data.png|alt=QIF 3.0 (Quality Information System) is a neutral CAD file format built on ANSI and ISO open standards and containing PMI (Product Manufacturing Information) semantics and other metadata, designed for future compatibility and traceability throughout the product life cycle, especially in automated processes and engineering applications.|thumb|430x430px|QIF 3.0 Quality Information System is a neutral CAD file format]]

Modern 3D CAD applications allow for the insertion of engineering information such as dimensions, GD&T, notes and other product details within the 3D digital data set for components and assemblies. MBD uses such capabilities to establish the 3D digital data set as the source of these specifications and design authority for the product. The 3D digital data set may contain enough information to manufacture and inspect product without the need for [[engineering drawings]]. Engineering drawings have traditionally contained such information.<ref>Thilmany, Jean, [https://www.asme.org/engineering-topics/articles/design/digital-tolerance "Digital Tolerance"], "MBD is a method of annotating computer-aided design models with geometric and tolerancing information that allows engineers to draw directly onto a 3-D model.", ASME.org, March 2011. Retrieved on 23 April 2015.</ref>

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In 2013, the [[United States Department of Defense]] released [[MIL-STD-31000]] Revision A to codify the use of MBD as a requirement for [[Technical data package|technical data packages]] (TDP).

STEP AP242 files are most commonly used in manufacturing because they contain a large amount of information in a relatively small file size.

KOMPAS-3D<ref>{{Cite web |title=Аннотированная 3D модель |url=https://pavel-samuta.livejournal.com/38165.html |access-date=2023-02-24 |website=pavel-samuta.livejournal.com |language=en-us}}</ref> contains tools for creating necessary and sufficient data in a 3D model for its production using MBD technology, which allows designers to apply the GOST 2.052-2015 attributes necessary for production to 3D models. These attributes include labels, notes, dimensions, tolerances, geometric tolerances, specifications, roughness, and others.

QIF 3.0 (Quality Information System) is a neutral CAD file format built on ANSI and ISO open standards and containing PMI (Product Manufacturing Information) semantics and other metadata, designed for future compatibility and traceability throughout the product life cycle, especially in automated processes and engineering applications.

In addition to the capabilities of the PDF format, 3D PDF files include 3D representations of the model. The 3D viewer tools are used to manipulate the 3D PDF model. The 3D PDF file also supports annotation data, but is only suitable for visual viewing.

ASME Y14.5 and ISO GPS (Geometric Product Specifications): These standards govern the use of geometric dimensions and tolerances - GD&T. A solid understanding of GD&T principles will help ensure that your MBD based processes are well defined, efficient and stable.

ASME Y14.41: This standard provides guidelines for creating a 3D digital product description.

ASME Y14.47: This standard provides schemas for organizing CAD models.

In America, design standards for MBD are defined in ASME Y14.41-2019 and in Europe ISO 16792:2015, and in Russia all information can be found in the current ESKD standards, such as GOST 2.052-2015 “Electronic product model. General provisions.»

==See also==