Geometrical product specifications (GPS). Standard reference temperature for geometrical product specification and verification

2002 ◽  
Keyword(s):  
Reference Temperature ◽  
Specification And Verification ◽  
Product Specifications ◽  
Geometrical Product Specification ◽  
Product Specification

A Surface Texture Information System Integrated with AutoCAD for Next Generation GPS

2008 ◽  
Vol 381-382 ◽  
pp. 237-240 ◽  
Author(s):  
Q. Qi ◽  
X. Liu ◽  
Xiang Qian Jiang
Keyword(s):  
Information System ◽  
Surface Texture ◽  
Next Generation ◽  
Texture Information ◽  
Inference Algorithms ◽  
Specification And Verification ◽  
Geometrical Product Specification ◽  
Product Specification ◽  
Complete Specification

To meet the requirements of next generation Geometrical Product Specification and Verification (GPS), a surface texture information system integrated with AutoCAD is developed. The information system mainly consists of three parts: a surface texture database containing large amount of surface texture specification information, inference algorithms and interfaces with AutoCAD, so that unambiguous, explicit and complete specification for design, manufacture and verification of surface texture can be provided in AutoCAD for function assurance.

scholarly journals COMPLEMENTING AND ENHANCING DEFINITIONS OF LINE PROFILE COMPOSITE TOLERANCE IMPOSED BY ISO GEOMETRICAL PRODUCT SPECIFICATION

2018 ◽  
Vol 18 (2) ◽  
pp. 75-85
Author(s):  
Yiqing YAN ◽  
Martin BOHN
Keyword(s):  
Line Profile ◽  
Geometric Feature ◽  
Theoretical Level ◽  
Tolerance Zone ◽  
New Approach ◽  
Physical Behaviour ◽  
And Function ◽  
Product Specifications ◽  
Geometrical Product Specification ◽  
Product Specification

According to the ISO Geometrical Product Specifications (GPS), if two or more specifications of the same characteristic are to be indicated, they may be combined as a composite tolerance. Therefore there are no definition differences between the single separate tolerance indicators and their composite tolerance, which is different from the ASME standards. Hereby, the definitions of the combined tolerance which specifies the additional location, orientation and form of tolerance zone are not explicitly defined in the current ISO. It restricts the required definitions of tolerance specifications of a component which are often utilized in practice. However, the required definitions cannot be notated in the technical drawings by using the ISO semantics, because the ISO definitions are insufficient. It causes definition gaps and misinterpretations. This paper focuses on developing the definitions of line profile composite tolerance and suggests a new approach for explicitly defined and function-oriented systematology of line profile composite tolerance. This research is based on the analysis of physical behaviour of geometric feature of a component on a theoretical level. Completed and enhanced definitions in an improved systematology for line profile composite tolerance is formulated which fills the definition gaps and eliminates the deficits in ISO GPS.

A DOE Approach for Sensitivity Analysis of a Shape Partitioning Algorithm

2008 ◽  
Author(s):  
Martina Gandini ◽  
Suela Ruffa
Keyword(s):  
Optimal Parameter ◽  
Research Area ◽  
Technical Committee ◽  
Parameter Configuration ◽  
Specification And Verification ◽  
Application Fields ◽  
Shape Searching ◽  
Geometrical Product Specification ◽  
Product Specification

In the field of geometrical product specification and verification, one of the main problems is classification and segmentation of 3D shapes. Shape recognition and segmentation is a widespread research area with different application fields (image processing, shape searching, pattern recognition, reverse engineering, etc.). Many methodologies and algorithms have been developed within such different fields, each one exhibiting optimized performances with respect to the set of objects and targets in each application [1, 11, 12]. Nevertheless, for manufactured parts a unique description of shape during the whole product lifecycle is still envisaged, and GPS (“Geometrical Product Specification and Verification”) project seems to be the most promising approach, but it should be stated that the partitioning process is still to be improved both theoretically and operationally. The ISO Technical Committee 213 (TC213), entrusted to develop the GPS project, founded the partitioning process on the classification of shapes based on symmetrical properties of surfaces [5, 6]. The aim of this paper is to describe the method proposed by Gelfand and Guibas [4] and analyze its performances on sampled surfaces by varying parameters of the method that basically affect its efficiency. In fact, the ISO research is currently devoted to identify a segmentation method characterized by efficiency, reliability, robustness and applicability with the aim to standardize the methodology for the verification phase of the manufacturing process. In this paper, a DOE analysis has been performed, in order to search an optimal parameter configuration, necessary to consider the method as a standard for shape partitioning.

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