Taxonomy of models for tolerance analysis in assembling

Polini, Wilma

doi:10.1080/00207543.2011.576275

Cited by 44 publications

(16 citation statements)

References 27 publications

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“…For this reason, several design principles have been established to keep the influence of variation in design parameters on the functional performance to a minimum. Thus, the verification of the resulting degree of freedom of principle designs, which corresponds to the kinematic design, prevents the development of over-constrained systems (Myszka 2012). Ebro et al (2012) adopts this basic idea at the interface level and thereby the design clarity procedure prevents unintended couplings within the contact area such as double fit.…”

Section: Approaches For the Consideration Of Variations In The Producmentioning

confidence: 99%

Integration of robust and tolerance design in early stages of the product development process

2020

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Due to the tightening of requirements and the increasing complexity of products, robust design becomes more and more important in the context of a straightforward product development. Although various robust design methods have been evolved to support the design of products that are less sensitive to variations, these methods are not sufficiently integrated into early stages of the product development process. This is mainly due to the lack of concrete product data necessary for robustness evaluation and tolerance specification. For this reason, it is still unclear to product development engineers when and how to apply existing approaches for enhancing the robustness of products. Therefore, this paper describes a holistic methodology that supports the designer in developing a robust product layout including an initial, validated tolerance specification based on the functional requirements. The proposed framework focuses on the close linkage of robust design activities with product data along the product development process and demonstrates the resulting benefits of an early consideration of variations and tolerances. In addition to the proper choice of robust product concepts and their corresponding spatial arrangement in the product structure, the approach allows a conceptual tolerance specification and the subsequent CADbased analysis based on the preliminary design. Thus, the proposed approach aims to reduce iterations in the conventional tolerancing. To demonstrate the process, the methodology is applied to an electric window regulator.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Section: Approaches For the Consideration Of Variations In The Producmentioning

confidence: 99%

Integration of robust and tolerance design in early stages of the product development process

2020

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“…Polini [13] compared the following tolerance analysis methods: Vector loop, Variational, Matrix, Jacobian and Torsor; and came to the conclusion that the vector loop model and the variational model appeared to be more developed than the others; these models were the only ones that provided support for solving tolerance stack-up functions involving networks. Moreover, they provided a method for assigning probability density functions to the model parameters, given the applied tolerances.…”

Section: Tolerance Analysis Softwarementioning

confidence: 99%

A tolerance analysis and optimization methodology. The combined use of 3D CAT, a dimensional hierarchization matrix and an optimization algorithm

Barbero

Azcona²,

Pérez³

2015

Int J Adv Manuf Technol

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We propose a methodology in this study for the analysis and the optimization of assembly tolerances. A combination of three components, it involves the use of 3D CAT software, a table referred to as a "dimensional hierarchization matrix", and a tolerance optimization algorithm. The Antolin Group, a Spanish multinational in the automobile components sector, employs this system to optimize tolerance values and to reduce manufacturing costs. The matrix was designed to enable easy identification, in a single table, of all requirements that fail to meet the specifications in the different approximations, prior to the definition of the dimensional and the geometric tolerances that comply with the functional requirements, and to identify which tolerances contribute most to variations in all of the functional conditions of the mechanism. Through its different iterations, this matrix allows us to see which of the tolerances should first be modified to optimize the design requirement specifications. A tolerance optimization algorithm was also defined, which functions with the data from the dimensional hierarchization matrix.

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“…The literature presents many models for tolerance analysis. that are not completely and univocally accepted (Polini, 2012). Those tolerance analysis models for rigid assemblies are the variation model (Gupta & Turner, 1993), the TTRS model (Desrochers, 2002), the matrix model (Desrochers & Rivière, 1997), the vector loop (Gao et al, 1998), the jacobian model (Laperrière & Lafond, 1999), the torsor model (Bourdet at al., 1996), the jacobian-torsor model (Ghie et al, 2003), the T-Map model (Davidson et al, 2002), the deviation domain model (Giordano et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Free-body model for tolerance analysis of rigid parts with manufacturing signature and operating conditions

Polini¹,

Corrado²

2019

10.5267/j.esm

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This work shows a free-body model for tolerance analysis, that uses the force free-body diagrams and the functional equations' sensitivities, by simulating the geometrical tolerances together with the dimensional ones. The geometrical tolerances were related to the deviations due to the manufacturing process (i.e. the manufacturing signature). Moreover, weight and friction forces were simulated too. A sensitivity analysis on the developed free body model aimed to evaluate the number of points to discretize the circular bodies and how to calculate the point clouds barycentre in order to reduce the simulation time. A case study was used to exemplify the application of the proposed free-body method with and without considering the manufacturing signature. The results show that the free body model is able to solve assembly problems and the manufacturing signature significantly influences the values of the functional requirement on the product and, therefore, it is impossible to neglect it.

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Taxonomy of models for tolerance analysis in assembling

Cited by 44 publications

References 27 publications

Integration of robust and tolerance design in early stages of the product development process

Integration of robust and tolerance design in early stages of the product development process

A tolerance analysis and optimization methodology. The combined use of 3D CAT, a dimensional hierarchization matrix and an optimization algorithm

Free-body model for tolerance analysis of rigid parts with manufacturing signature and operating conditions

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