Bibliographies thématiques / Geometrical Product Specification and Verification (GPS)

Littérature scientifique sur le sujet « Geometrical Product Specification and Verification (GPS) »

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Publié le 14 mars 2023

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Articles de revues sur le sujet "Geometrical Product Specification and Verification (GPS)"

Xia, Xue, Yan Ru Zhong, Yu Chu Qin et Liu Jing Ji. « Research on Operational Model of New-Generation GPS Based on Dynamic Description Logic ». Applied Mechanics and Materials 128-129 (octobre 2011) : 702–5. http://dx.doi.org/10.4028/www.scientific.net/amm.128-129.702.

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Operation and Operator are the key technologies in the new-generation geometrical product specification and verification (GPS). In order to solve the geometrical specification problems of product functional requirements and the ambiguity problems of product specification, this paper utilizes a new method based on dynamic description logic to describe the fundamental concepts of geometrical specification. It analyzes the geometrical features of geometrical product functional specification. By establishing the model of the operations, describing the input and output parameters in the specification and verification process, and analyzing the preconditions and results of the executions of specification operator and verification operator, the paper simplifies the operation results and overcomes the shortcomings of ambiguity and inconsistency in product specification process. Finally, it takes the specification process of perpendicularity as an example to prove the feasibility and validity of this method.

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Maláková, Silvia, et Samuel Sivák. « GPS Application in the Design of Gearboxes ». Acta Mechanica et Automatica 16, n^o 4 (14 octobre 2022) : 309–15. http://dx.doi.org/10.2478/ama-2022-0037.

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Abstract The integrated geometrical product specification (GPS) system for workpiece geometry specification and verification is an improved engineering tool for product development and production. The goal of the GPS system is to provide tools for cost-effective management of variability in products and processes. This can be achieved by using a more precise way of expressing the functional requirements of the workpiece, complete and well-defined specifications and integrated verification approaches. The intended function of the product is ensured by controlling the geometry and material properties of the workpiece parts, which make up the product. GPS is a language just for checking geometry, and further development is based on computational mathematics and correct, consistent logic using general sets of rules that can be applied to all types of specifications. This article deals with the application of GPS rules in the design of gearboxes.

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Liu, Hui Fen, Mei Fa Huang, Lei Lei Chen et Bo Shi. « On Generation of the Specification Model for Concentricity Based on Mathematical Modeling ». Advanced Materials Research 361-363 (octobre 2011) : 1481–85. http://dx.doi.org/10.4028/www.scientific.net/amr.361-363.1481.

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Feature specifications are important composite parts in the new generation of geometrical product specifications and verification (GPS). According to the theories of specification model of shaft parts, this paper presents a method to generation of specification model of concentricity. Firstly, the mathematical model of concentricity is established in terms of nominal geometrical features of product for the parts the functional requirement are satisfied. Secondly, the simulation points of the model are generated by using the methods of axial stratification and circumferential multi-angles. The concentricity specification model could be generated after these operations of association and collection. Finally, an example is applied to illustrate the new method. The experiment results show the effectiveness of the proposed method.

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Li, Guo Wei, Wei Min Zhang, Peng Zhong Li et Yi Zhou Zhu. « Computer Aided Geometric Tolerance Specification in 3D-CAD System ». Applied Mechanics and Materials 34-35 (octobre 2010) : 1238–42. http://dx.doi.org/10.4028/www.scientific.net/amm.34-35.1238.

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Tolerance specification is the activity of specifying tolerances. In current 3D-CAD system, tolerance types and tolerance values are specified by designer manully, and the validity checking of tolerance is no available. To achieve semi-automatic tolerance specification, geometric feature in the next-generation Geometrical Product Specifications and Verification (GPS) was introduced, the corresponding rules between geometric features and tolerance types were presented; The recommended values for tolerance were stored in a database system and constrainted by tolerance principles. Additionally, the implementation of computer aided geometric tolerance specification was proposed. Finally, the initial prototype system was developed to demonstrate the proposed scheme, which aides designer to define reasonable tolerance types and tolerance values in 3D-CAD system.

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Toteva, Pavlina, et Krasimira Koleva. « Application of New Generation Geometrical Product Specifications in the practice in Small and Medium Sized enterprises ». MATEC Web of Conferences 299 (2019) : 04006. http://dx.doi.org/10.1051/matecconf/201929904006.

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The increasing development of modern methods of product manufacturing implies an improvement and a new approach to the modern drawing specification in design documentation for design requirements of different parts and assemblies. The ISO Technical Committee 213 has published 148 standards and 48 otherstandards are under development. These standards set out requirements for the accuracy of geometrical characteristics of products. They define requirements for the linear sizes, dimensions different than linear sizes as well as geometric deviations such as form, orientation, location deviations and run-out, and surface roughness and waviness. Ways of indication of these requirements in the drawings are discussed. Many standards are dedicated to the requirements for measuring these characteristics, to measuring instruments for linear sizes and geometrical characteristics. This report reviews the general concept of geometrical product specifications (GPSs), the GPS model, and new terminology by tolerancing linear sizes, geometrical specifications that facilitate communication between design manufacturing and verification and prevent ambiguous interpretation of requirements. Based on the metrological expertise of the drawings in a number of small and mediumsized enterprises, the degree of implementation of the new generation GPS standards and the problems related to it have been analysed.

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Qi, Q., X. Liu et Xiang Qian Jiang. « A Surface Texture Information System Integrated with AutoCAD for Next Generation GPS ». Key Engineering Materials 381-382 (juin 2008) : 237–40. http://dx.doi.org/10.4028/www.scientific.net/kem.381-382.237.

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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.

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Du, Hai Qing, et Ya Zhang. « Uncertainty Estimation in Straightness Mini-Zone Verification Based on Improved GPS Standard System ». Advanced Materials Research 139-141 (octobre 2010) : 2063–66. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.2063.

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Improved Geometrical Product Specifications (GPS) is an internationally accepted standards system. It is the foundation of the technology standards and metrology specifications. Uncertainty is one of the most important concepts in improved GPS. In the improved GPS standards system, uncertainty is used as an economic tool to enable optimum allocation of resources amongst specification, manufacturing and verification. Estimation of uncertainty in measurement according to improved GPS can improve the reliability of the measurement. A method to estimate the uncertainty in straightness measurement is proposed according to the requirements of improved GPS standard system. Based on the mini-zone method and the transparent box model, the calculation equation of uncertainty in straightness measurement is deduced. The experiment indicates that this method may assure the integrity of the verification result and improve the reliability of measurement.

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Wang, Jin Xing, Xiang Qian Jiang et Pan Wang. « A Calculation Method for Compliance Uncertainty of GPS Standard-Chain ». Advanced Materials Research 201-203 (février 2011) : 1642–48. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.1642.

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The improved GPS (Geometrical Product Specification) system uses uncertainty as an economic tool to enable optimum allocation of resource amongst specification, manufacturing and verification. For a given GPS standard-chain, the key question is to calculate the compliance uncertainty. The determination of compliance uncertainty is a complex question because specification uncertainty and measurement uncertainty arise from many causes and propagate through the GPS standard-chain. A calculation method for compliance uncertainty of GPS standard-chain is proposed in this article. According to ISO 17450–2, a GPS process should be either in default state or special state. The biggest difference between the two states is that whether the specification operator is accordant with the verification operator. Aiming at the two states, the flow for the computation of compliance uncertainty is given respectively, and a case study is applied in default state. Results show it enables to generate compliance uncertainty on the verification of a GPS standard-chain, which makes the acceptance or refusal of GPS characteristic can be conducted in a quantitative way, so the veracity of verification could be improved.

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Khan, Muhammad Ilyas, et Shuyuan Ma. « New Generation Geometrical Product Specification (GPS) Backed Flatness Error Estimation and Uncertainty Analysis ». Open Mechanical Engineering Journal 10, n^o 1 (29 avril 2016) : 66–78. http://dx.doi.org/10.2174/1874155x01610010066.

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Measurement and verification are one of the prime stages in the entire course of geometrical products in new generation of geometrical product specifications (GPS) standard. Like other kinds of form tolerances, flatness error is one of the important characteristics affecting the functionality and quality of machined components; sufficient efforts have long been made to determine the flatness error close to the true value based on the minimum zone method (MZM) and still needs continual improvement. This paper presents real coded genetic algorithms referred as Efficient Genetic Algorithms (EGA) for flatness error based on minimum zone method having good precision, repeatability and fast convergence rate. This paper also presents evaluation procedure for measurement uncertainty in flatness error based on new generation geometrical product specifications (GPS). Uncertainty in flatness error has been determined and evaluation procedure is provided to prove the conformance or non-conformance by taking into account the uncertainty in measurement. The contributing factors in measurement uncertainties have been identified and then quantified. The flatness error and evaluation theory in this paper are in the framework of new generation GPS standard. Two practical examples have been presented to show the effectiveness of EGA and shed some light on the uncertainty evaluation theory based on new generation GPS standard.

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Wen, Xiu-Lan, Xiao-Chun Zhu, Yi-Bing Zhao, Dong-Xia Wang et Feng-Lin Wang. « Flatness error evaluation and verification based on new generation geometrical product specification (GPS) ». Precision Engineering 36, n^o 1 (janvier 2012) : 70–76. http://dx.doi.org/10.1016/j.precisioneng.2011.07.006.

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Thèses sur le sujet "Geometrical Product Specification and Verification (GPS)"

SAUZA, BEDOLLA JOEL. « Efficiency improvement of product definition and verification through Product Lifecycle Management ». Doctoral thesis, Politecnico di Torino, 2013. http://hdl.handle.net/11583/2510125.

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The correct and complete geometrical definition of a product is nowadays a critical activity for most companies. To solve this problem, ISO has launched the GPS, Geometrical Product Specifications and Verification, with the goal of consistently and completely describe the geometric characteristics of the products. With this project, it is possible to define a language of communication between the various stages of the product lifecycle based on "operators": these are an ordered set of mathematical operations used for the definition of the products. However, these theoretical and mathematical concepts require a level of detail and completeness of the information hardly used in usual industrial activities. Consequently in industrial practice the definition and verification of products appears to be a slow process, error-prone and difficult to control. Product Lifecycle Management (PLM) is the activity of managing the company's products throughout their lifecycle in the most efficient way. PLM describes the engineering aspects of the products, ensuring the integrity of product definition, the automatic update of the product information and then aiding the product to fulfil with international standards. Despite all these benefits, the concepts of PLM are not yet fully understood in industry and they are difficult to implement for SME’s. A first objective of this research is to develop a model to depict and understand processes. This representation is used as a tool during the application of a case study of a whole set of a GPS standards for one type of tolerance. This procedure allows the introduction of the GPS principles and facilitates its implementation within a PLM process. Until now, PLM is presented on isolated aspects without the necessary holistic approach. Furthermore, industry needs people able to operate in PLM context, professional profiles that are not common on the market. There is therefore an educational problem; besides the technical knowledge, the new profile of engineers must be also familiar with the PLM philosophy and instruments to work effectively in a team. With the aim of solving this problem, this thesis presents a PLM solution that gives the guidelines for a correct understanding of these topics.

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RICCI, FRANCESCO. « Effective Product Lifecycle Management : the role of uncertainties in addressing design, manufacturing and verification processes ». Doctoral thesis, Politecnico di Torino, 2012. http://hdl.handle.net/11583/2501694.

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The aim of this thesis is to use the concept of uncertainty to improve the effectiveness of Product Lifecycle Management (PLM) systems. Uncertainty is a rather new concept in PLM that has been introduced with the new technical language, drawn by ISO, to manage Geometrical Product Specification and Verification (GPS) in the challenging environment of modern manufacturing. GPS standards regard in particular design and verification environments, and want to guarantee consistence of information through a technical language which define both specification and verification on sound logical and mathematical bases. In this context, uncertainty is introduced as the instrument that measures consistency: between the designer intentions (specifications) and the manufactured artefact (as it is observed through measurement) as well as between the measurand definition provided by designers (the specification again) and that used by metrologists. The implications of such an approach have been analyzed through a case study dealing with flatness tolerance and paying particular attention to the verification processes based on Coordinate Measuring Machines (CMM). A Design of Experiment (DoE) has been used and results have been analyzed and used to build a regression model that allows generalization in the experiment validity domain. Then, using Category Theory, a categorical data model has been defined which represents the operation based structure of GPS language and uses the flatness research results in order to design a software able to concretize the GPS vision of geometrical product specifications management. This software is able to translate specification requirements into verification instructions, estimate the uncertainty introduced by simplified verification operations and evaluate costs and risks of verification operations. It provides an important tool for designers, as it allows a responsible definition of specifications (designer can simulate the interpretation of specifications and have an idea of the costs related with their verification), and for metrologist, as it can be a guide for designing GPS compliant verification missions or handling the usual verification procedures according to the GPS standards. However, during the study, it has been matured the consciousness that this approach, even if correct and valuable, was not the most suitable to fully exploit the real potential of CMM. Then, aside the GPS oriented work, an adaptive sampling strategy, based on Kriging modelization, has been proposed with very encouraging results.

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YUSUPOV, JAMBUL. « On the assessment of the form error using Probabilistic Approach based on Symmetry Classes ». Doctoral thesis, Politecnico di Torino, 2015. http://hdl.handle.net/11583/2588833.

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Nowadays, a Coordinate Measuring Machine (CMM) is one of the essential tools used in the product verification process. Measurement points provided by a CMM are conveyed to the CMM data analysis software. As a matter of fact, the software can contribute significantly to the measurement uncertainty, which is very important from the metrological point of view. Mainly, it is related to the association algorithm used in the software, which is intended to find an optimum fitting solution necessary to ensure that the calculations performed satisfy functional requirements. There are various association methods, which can be used in these algorithms (such as Least squares, Minimum zone, etc.). However, the current standards do not specify any of the methods that have to be established. Moreover, there are different techniques for the evaluation of uncertainty (such as experimental resamplings, Monte Carlo simulations, theoretical approaches based on gradients, etc.), which can be used with association methods for the further processing. Uncertainty evaluated by a combination of an association method and uncertainty evaluation technique is a term of implementation uncertainty, which in its turn is a contributor to measurement uncertainty according to the Geometrical Product Specification and Verification project (GPS). This work is focused on the analysis of the impact of the association method on the implementation uncertainty, by assuming that all the other factors (such as the sampling strategy, the measurement equipment parameters, etc.) are fixed and chosen according to standards, within the GPS framework. The objective of the study is Probabilistic method (PM), which is based on the classification of continuous subgroups of a rigid motion (a mathematical principle of the GPS language) and non-parametric density estimation techniques. The method has essentially been developed to decompose complex surfaces and showed promising future in the shape partitioning. However, it comprises geometric fitting procedures, which are considered in this work in more detail. The methodology of the research is based on the comparison of PM with another statistical association method, namely the Least squares method (LS) by means of the parameter estimation and uncertainty evaluation. For the uncertainty evaluation two different techniques, the Gradient-based and Bootstrap methods are used in a combination with the both association methods, PM and LS. The comparison is performed through both the analysis of the results obtained by the parameter estimation and analysis of variance. Variances of the estimated parameters and estimated form error are considered as the response variables in the analysis of variance. The case study is restricted to the roundness geometric tolerance evaluation. Despite the measurement process was simulated, the methodology can be applied for real measurement data. The obtained results during the work can be interesting both in the theoretical and in the practical points of view.

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Chapitres de livres sur le sujet "Geometrical Product Specification and Verification (GPS)"

Qie, Yifan, Lihong Qiao et Nabil Anwer. « A Framework for Curvature-Based CAD Mesh Partitioning ». Dans Lecture Notes in Mechanical Engineering, 228–34. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70566-4_37.

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AbstractIn ISO Geometrical Product Specifications and Verification Standards (GPS) [1], partition is one of the fundamental operations used to obtain ideal or non-ideal features of a product. The operation of partition produces independent geometrical features by decomposing the object. A curvature-based CAD mesh partitioning framework is proposed in this paper. The framework combines several key steps including curvature-based attribute calculation, local shape type refinement, region growing, slippage analysis and statistical modeling. The partitioned features are classified into seven invariance classes of surface in the context of ISO GPS. A case study shows that not only appropriate partitioning but also accurate invariance class recognition for GPS are achieved by the proposed framework.

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Durakbasa, N. M., et G. Poszvek. « Practical Aspects in the Application of Geometrical Product Specifications and Verification (GPS) in the Micro and Nano-Scale Manufacturing ». Dans Lecture Notes in Mechanical Engineering, 217–39. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-18177-2_21.

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Durakbasa, N. M., et G. Poszvek. « Correction to : Practical Aspects in the Application of Geometrical Product Specifications and Verification (GPS) in the Micro and Nano-Scale Manufacturing ». Dans Lecture Notes in Mechanical Engineering, C1. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-18177-2_29.

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Tornincasa, Stefano. « The Geometrical Product Specification (GPS) Language ». Dans Technical Drawing for Product Design, 11–39. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60854-5_2.

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Serre, Philippe, Alain Riviere et André Clement. « Analysis of functional geometrical specification ». Dans Geometric Product Specification and Verification : Integration of Functionality, 115–25. Dordrecht : Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-1691-8_12.

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Ballu, Alex, Luc Mathieu et Jean-Yves Dantan. « Global view of geometrical specifications ». Dans Geometric Product Specification and Verification : Integration of Functionality, 13–24. Dordrecht : Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-1691-8_2.

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Srinivasan, Vijay. « An Integrated View of Geometrical Product Specification and Verification ». Dans Geometric Product Specification and Verification : Integration of Functionality, 1–11. Dordrecht : Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-1691-8_1.

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Legoff, Olivier, et François Villeneuve. « Three-dimensional geometrical tolerancing : quantification of machining defects ». Dans Geometric Product Specification and Verification : Integration of Functionality, 185–96. Dordrecht : Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-1691-8_19.

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Gaunet, Dominique. « 3D Functional Tolerancing & ; Annotation : CATIA tools for Geometrical Product Specification ». Dans Geometric Product Specification and Verification : Integration of Functionality, 25–33. Dordrecht : Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-1691-8_3.

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Portman, V. T., V. G. Shuster et Y. L. Rubenchik. « Geometrical tolerancing using linear programming : functional approach and specification of application domain ». Dans Geometric Product Specification and Verification : Integration of Functionality, 227–36. Dordrecht : Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-1691-8_23.

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Actes de conférences sur le sujet "Geometrical Product Specification and Verification (GPS)"

Gandini, Martina, et Suela Ruffa. « A DOE Approach for Sensitivity Analysis of a Shape Partitioning Algorithm ». Dans ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59175.

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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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Wang, Yu, Shouwen Yao, Qingdong Yan, Jilin Liu et Qinghua Zhang. « The Contact Dynamic Modeling and Analysis Based on Spline Assembly Feature Information ». Dans ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66229.

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Generally, there is clearance between internal and external spline for the convenience of assembly. Because of the error caused by the process of production and assembly, the clearance is not consistent. This causes nonuniformity of load distribution among spline teeth, which reduce the service life of spline and influence the quality of transmission. In order to analyze these phenomenon, a contact dynamic model based on spline assembly feature is presented. Here, an information model called spline assembly feature, which contains the information of dimension, tolerance and material, is established. Based on Dimensional and Geometrical Product Specification and Verification (GPS), the deviation of minor diameter face and tooth flank is calculated, and the specification surface model is generated based on Small Displacement Theory (SDT). The contact situation of spline engagement is analyzed. With the use of collision algorithm, actual contact state is simulated and the penetration depth of contact zone is obtained. Material mechanics analysis is performed to acquire the rigidity of teeth meshing. With the work above, a multi-rigid dynamic model of spline is established based on continuous contact force theory and Hertz contact theory. Two indexes are introduced to evaluate the nonuniformity of load on spline teeth under stable condition and impact condition. Results show that the model is more accurately to predict dynamic performance.

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Salsbury, Jim. « Understanding the Test Measurand and the Profound Impact on Calibration, Verification, and Uncertainty ». Dans NCSL International Workshop & Symposium. NCSL International, 2016. http://dx.doi.org/10.51843/wsproceedings.2016.31.

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In September 2015 a new international standard was published that will likely have far reaching impact in the calibration and test world. This standard, ISO 14253-5, is entitled "Geometrical product specifications (GPS) - Inspection by measurement of workpieces and measuring equipment - Part 5: Uncertainty in verification testing of indicating measuring instruments". While this standard was developed by experts in dimensional metrology, the general concepts need to be deeply considered by anybody involved with conformance testing of any type of measuring instrument to stated specifications. This paper begins with a summary of the primary concepts in ISO 14253-5 - the definition of the test measurand and the measurement uncertainty associated with verification testing, which the standard has termed the "test value uncertainty". This standard is the first formal attempt internationally to define the measurand in conformance testing, and the resulting impact to uncertainty can be significant. This paper will then go beyond the scope of ISO 14253-5 and show how the same principles apply to verification testing of material measures (i.e. artifacts and standards). This paper will then carefully analyze the test measurand and discuss the broad and critical ramifications on the definitions and concepts of calibration and verification. This paper will show how many of the generally accepted notions on the differences between calibration and verification should be carefully considered, and possibly reconsidered. It is the purpose of this paper to introduce the important concepts of ISO 14253-5, evaluate the broader impact, and foster further discussion within NCSL International.

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Guo, Junkang, Jun Hong, Xiaopan Wu, Mengxi Wang et Yan Feng. « The Modeling and Prediction of Gravity Deformation in Precision Machine Tool Assembly ». Dans ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63441.

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The variation propagation in mechanical assembly is an important topic in several research fields, such as computer aided tolerancing (CAT) and product quality control. Mathematical models and analysis methods have been developed to solve this practical problem. Tolerance analysis which is based on the rigid hypothesis can be used to simulate the mass manufacturing and assembly. The state space model and stream of variation theory are mainly applied in flexible part assembly. However, in precision machine tool assembly, both tolerance design and process planning critically impact the accuracy performance, mainly because of the fact that the gravity deformation, including the part deformation and the variation in the joint of two connecting parts, cannot be ignored in variation propagation analysis. In this paper, based on the new generation GPS (Geometrical Product Specification and Verification) standards, the verification and modeling of key characteristics variation due to gravity deformation of single part and adjacent parts are discussed. The accurate evaluation of position and orientation variation taking into account form errors and gravity deformation can be solved from this model by FEM. A mathematical model considering rail error, stiffness of bearings is introduced to simulate the motion error in gravity effect. Based on this work to more accurately calculate the variation propagation considering gravity impact, a state space model describing the assembly process of machine tools is proposed. Then, in any assembly process, the final accuracy can be predicted to find out whether the accuracy is out of design requirement. The validity of this method is verified by a simulation of the assembly of a precision horizontal machining center.

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Xiangqian, Li, Huang Meifa, Kuang Bing, Wang Qiaoyi et Bao Jiading. « Specification design of planar feature based on the new generation geometrical product specification and verification ». Dans Instruments (ICEMI). IEEE, 2009. http://dx.doi.org/10.1109/icemi.2009.5274480.

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Peng, Heping, Xiaojun Liu, Xiangqian Jiang et Zhengao Xu. « Evaluation and management of measurement uncertainty in the new generation Geometrical Product Specification (GPS) ». Dans Third International Symposium on Precision Mechanical Measurements. SPIE, 2006. http://dx.doi.org/10.1117/12.716357.

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Leung, Christopher. « In Search of a Dialogue for Manufacturing Conformance : When Precise Geometry is Paradoxically Imprecise Design Intent ». Dans Design Computation Input/Output 2021. Design Computation, 2021. http://dx.doi.org/10.47330/dcio.2021.vqsv3609.

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An article advocating in favour of introducing the Geometrical Product Specification (GPS) framework to pre-fabrication, pre-assembly and installation sections of the construction industry where designers, makers and inspectors can have clear and unambiguous terms of reference and rules of interpretation with which to discuss and negotiate in a dialogue between functional requirements and design specifications that can be modelled, manufactured and measured for conformance.

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Alperin, Regina, Eyal Manor et Moti Leibowitz. « Verification and Validation Method in Complex Systems : Case Study ». Dans ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59561.

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The article describes a case study methodology that is applied in RAFAEL for the verification and validation (V&V) of complex and multi-disciplinary systems. Various methods of V&V are found within the nature and the type of the product. Some applications use methods that are prevalent in the electronics industry. There are other methods that are based on international standards such as V&V for airborne structures. Complex systems are characterized by a number of special issues which do not allow for a simple implementation of V&V mentioned above. The following issues are unique to complex systems: the design consists of multi-disciplinary subjects, the cost of the life cycle is high, it takes a long time for hardware production and for the completion of development, there is a demand for high reliability, the V&V process contains a multiplicity of parameters and the system has multiple interfaces. For systems of this nature there is no V&V process available in use and it is necessary to implement a tailored-made method. This method of V&V deals with the two main quantitative and qualitative questions of proof: (a) how does the system and sub-system behave under external environmental conditions?, (b) how does the system and sub-system functioning under the existence of differences between sub-systems and components which are supplied in the delivery stage of the life cycle (i.e. geometrical and performance tolerances, time depending parameters)? The new approach is to design a process of V&V in the early stages of the product life cycle. It is different from the conventional approach which performs the reliability tests at the completion of the product development via the approval examinations. The steps in building updated V&V process for complex system are: 1. Identification of the functionality specification of the system and deriving from it the V&V building blocks. 2. Breaking down the system into independent factors and connecting to each factor the relevant part of the physical structures. For each component in the structures it is necessary to identify its functionality and whether if the specification comply with demands. 3. Building computational, analytical and functional models which describe the system, sub-system and its components behavior and sensitivity analysis. 4. Experimental validation for individual sub-systems and components. The purposes are to verify reliability of the models, to validate the margin of safety needed and to find out the failure threshold. 5. Experimental validation at a higher level. The purposes of this stage are to examine the internal and external interfaces, to verify the approach of the separation of parameters and to validate the system functionality. This new approach will be demonstrated on an electromechanical system.

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Qie, Yifan, Lihong Qiao, Yapeng Cui et Nabil Anwer. « A Domain Ontology for Assembly Tolerance Design ». Dans ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-72526.

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Product requirements, tolerance standards and design experience are three main aspects need to be considered during assembly tolerance design process. Currently the standards of tolerance has been included in the process of computer aided tolerance design. The representation for geometrical product specification and verification knowledge has been studied as well. However, the studies mentioned above is lack of a unified knowledge representation to visually express product requirements and design experience. A semantic hierarchical representation structure of assembly tolerance is proposed in this paper to establish the mapping between the geometric feature of the part and the tolerance type as well as tolerance value. A domain ontology model for assembly tolerance design is established with OWL ontology to describe domain information while SWRL rules to enrich the semantics of domain ontology. The application of the model in the proposed hierarchical representation structure enables the consideration tolerance standards, product requirements and design experience of in computer aided tolerancing process, by which the assembly tolerance design knowledge is able to be shared effectively. The application of proposed model is verified by an instance of assembly tolerance reasoning in this paper.

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Shakarji, Craig M. « Understanding the Ramifications of Important Proposed Changes to Decision Rules in Three Standrads within ISO and ASME ». Dans NCSL International Workshop & Symposium. NCSL International, 2015. http://dx.doi.org/10.51843/wsproceedings.2015.49.

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Decision rules define how measurement uncertainty is used (in conjunction with measured values and specification zones) to make acceptance or rejection decisions of products. Decision rule changes that are being proposed in key standards-some of which are quite likely to be implemented-can have important ramifications to the metrological world. Firstly, this paper seeks to highlight proposed changes to ISO 14253-1, which standardizes the default decision rule for the scope of ISO/TC 213, Dimensional and geometrical product specification and verification. Briefly, the change is a shift from a universally-applied guard band with a magnitude equal to 100 % of the expanded (k = 2) uncertainty to a more general guard band equal to the 95th percentile of the error distribution, which is equivalent (in most cases) to a guard band equal to 82.5 % of the (k = 2) expanded uncertainty. Secondly, this paper seeks to highlight a proposed addition to ASME B89.7.3.1, a standard dealing with decision rules. The proposal-presented at a recent B89.7 meeting-could lead to an additional definition of an extended 4:1 simple acceptance/rejection decision rule that allows for acceptance and rejection decisions in some cases when 4:1 is not met, yet the measured value is sufficiently far from the specification limit such that the risk probability is no greater than that implied by the conventional 4:1 rule. Finally, this paper seeks to highlight a proposal from a joint working group between ASME B89 and Y14.5, to be made at the design stage, that can influence decision rule requirements, based on a designer's need to mitigate the risk of potential pass errors. The proposed design requirement would not explicitly state the decision rule but would limit the maximum probable error and hence constrain a metrologist's choice of decision rules. While the authors-who are members of these standards bodies-view these proposed changes as generally favorable, the metrology community should be well aware of the implications of these proposed changes and have appropriate means for feedback into these standards setting organizations at this stage of development.

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