TS EN 9300-120
Aerospace series - LOTAR - LOng Term Archiving and Retrieval of digital technical product documentation such as 3D CAD and PDM data - Part 120: CAD 3D explicit geometry with graphic product and manufacturing information
1.1 Introduction This document defines the requirements for the long term digital preservation of the presentation of Product and Manufacturing Information (PMI) with their possible links to the 3D explicit shape and geometry of single CAD parts. The goal is to preserve this 3D information with respect to the geometry and related PMI produced by the original CAD system, following the principles laid down in EN 9300 003 “Fundamentals and Concepts”. The requirements of EN 9300 110 “CAD mechanical 3D explicit geometry information” about the preservation of the 3D explicit shape shall apply within this document. The meaning of terms “Presentation” and “Representation”, defined in the EN 9300 100 “Common concepts for Long term archiving and retrieval of CAD 3D mechanical information” is required to understand this EN 9300 document. 1.2 In scope The following outlines the total scope of this document: – the Presentation of 3D geometrical dimension and tolerance, and 3D annotation attributes; – their possible semantic links with 3D Geometric shape; – User Defined Attributes: that are assigned to 3D geometric entities or at the part level. For the purpose of this document, the semantic definition is at the level that supports associative “Cross-highlighting”, to illustrate the portion of the geometry to which a PMI element applies. In this version, the technology used to preserve this 3D information is based on polyline and tessellated presentation. Polyline presentation is a conversion to lines and curves of all 3D annotations by the STEP interfaces of the CAD system, including validation properties. Tessellated presentation is a conversion to tessellated curves and tessellated faces. The main use cases are the Certification and Product Liability of static information, however, re-use is also possible after the deletion of previous PMI and creation of new PMI (refer to clause 3 for definition). 1.3 Out of scope The following is outside the scope: – machine-interpretable PMI “Representation”; – how to preserve additional information: – – property rights; – -form features; – -machining features; – CAD Assemblies.
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About This Item
TS EN 9300-120 is the LOTAR document for the long-term digital preservation of Product and Manufacturing Information (PMI) presentation associated with explicit 3D CAD geometry in aerospace. It addresses how the visual presentation of PMI, and its links to the geometry of single CAD parts, can be retained so that the archived information remains meaningful in relation to the original CAD-defined shape.
How the document organises PMI and geometry
The scope centres on 3D geometric dimensioning and tolerancing, 3D annotation attributes, and their possible semantic links to 3D geometric shape. It also includes user-defined attributes assigned either to geometric entities or at part level. In general technical terms, this distinction matters because archived CAD data may preserve the appearance of an annotation without preserving the association that tells users which face, edge, or feature the note applies to. This standard focuses on keeping that association intelligible for retrieval and interpretation.
Archiving method and boundaries
For this edition, the preservation technology is based on polyline presentation and tessellated presentation. Polyline presentation converts 3D annotations into lines and curves through CAD STEP interfaces, including validation properties; tessellated presentation converts data into tessellated curves and tessellated faces. The document uses semantic definition at a level that supports associative cross-highlighting, so the portion of geometry affected by a PMI element can be visually indicated. It also states that the requirements of EN 9300-110 for preserving explicit 3D shape apply here. Outside the scope are machine-interpretable PMI representation, additional information such as property rights, form features and machining features, and CAD assemblies.
- Covers PMI presentation linked to explicit 3D geometry.
- Includes 3D GD&T, 3D annotation attributes and user-defined attributes.
- Supports semantic links sufficient for associative cross-highlighting.
- Uses polyline and tessellated presentation as the preservation basis.
- Excludes machine-interpretable PMI representation and CAD assemblies.
- Publication Date: 8.11.2023
- Standard Status: U (Yürürlükteki Standard/Standard)
- Publisher: TSE
- Document Language: en
- ICS Classification: 01.110 Teknik Ürün Dökümantasyonu
- Pages: 29
- Source Standard: EN 9300-120:2023
- International Equivalents: EN 9300-120-EQV
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