Variational modeling and assembly constraints in tolerance analysis of rigid part assemblies: planar and cylindrical features

Franciosa, Pasquale; Gerbino, Salvatore; Patalano, Stanislao

doi:10.1007/s00170-009-2400-5

Cited by 39 publications

(27 citation statements)

References 13 publications

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“…Assembly Constraints, specified in the previous step forms input to VRM [14], which generates geometric variations of DPs based on Monte-Carlo Simulation. Optimal assembly configuration for a set of DPs is determined and FRs are measured as clearance or interference between pre-defined inspection points on the planar or cylindrical features.…”

Section: Simulate Dps and Frs By Variation Response Methods (Vrm) -Variamentioning

confidence: 99%

Root Cause Analysis of Product Service Failures in Design-A Closed-loop Lifecycle Modelling Approach

2014

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A number of industries including aerospace, telecom and automotive incur warranty and product return costs due to product malfunctions in service, which can also negatively impact customer satisfaction and loyalty. Product failures, which occur in service, are often caused by root causes at design or at manufacturing phases. Therefore a novel inter-loop modelling framework is needed which takes information from different phases to determine root causes and corrective actions. This goes beyond current intra-loop methods such as design optimization, statistical process control etc., which uses information from a single phase to address failures in the same phase. However, inter-loop modelling poses the challenge of integrating heterogeneous data from different phases of lifecycle with product and process models to determine failure root causes and corrective actions. To deal with failures in service, this paper proposes Closed-loop Lifecycle Modelling approach, specifically integrating information from service and design. Related work on fault diagnosis and corrections is also reviewed in the context of intra and inter loops of product lifecycle. The proposed methodology addresses root cause analysis (RCA) of service failures caused due to dimensional variations of product features. RCA identifies critical geometric features of internal components, which affects dimensional variations of product features. This is done by integrating warranty data from service to design models such as CAD, Geometric Dimensioning & Tolerancing (GD&T) etc. Steps of the methodology include: (i) identification of faulty product features from the Ishikawa diagram of the failure reported in warranty; (ii) variation simulation analysis of geometric features of internal components; (iii) determination of critical geometric features affecting faulty product feature via surrogate modelling of dimensional variations; and (iv) analyzing sensitivity of faulty product features on critical geometric features. The proposed Design-Service inter loop is demonstrated by an industrial case study of automotive ignition switch and 'Sticky Key' service failure. RCA of 'Sticky Key' issue identifies critical geometric features and their sensitivity in affecting the faulty product features, which cause the failure.

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Section: Simulate Dps and Frs By Variation Response Methods (Vrm) -Variamentioning

confidence: 99%

Root Cause Analysis of Product Service Failures in Design-A Closed-loop Lifecycle Modelling Approach

2014

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“…The proposed model in this paper is considered as a tool for visualization and tolerance impact analysis (interference detection) in the assembly simulation case. The second aspect addressed in the literature appears to be closest to this work [22,[25][26][27][28]. Indeed, we can learn a great deal from the methods used in this second aspect, and apply them to solve some issues of the problem as contemplated: Using the OFA to update the mating constraints, the choice of the assembly (sequential assembly), using the parametric variational features to generate the assembly component configurations.…”

Section: Synthesismentioning

confidence: 99%

“…The mobilities between different parts of the gauge are considered the function of the other parts of the mechanical system. Franciosa et al developed a tolerance analysis model [28]. To simulate variational features of rigid-part assemblies, the authors used the Statistical Variational Analysis for tolerancing (SVA-TOL).…”

Section: Generation Of the Realistic Configurations And The Redefinitmentioning

confidence: 99%

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An algorithm for CAD tolerancing integration: Generation of assembly configurations according to dimensional and geometrical tolerances

Louhichi

Tlija

Benamara

et al. 2015

Computer-Aided Design

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“…For example, LI and ROY [10] propose a relative positioning scheme, which is used to determine the positions of variant polyhedral parts in 3D assemblies. Furthermore, a numerical procedure for the assembly simulation among variational features has been proposed in [11,12]. Both approaches can be used to model and simulate assemblies with variant parts, but lack of form deviation considerations.…”

Section: Representationmentioning

confidence: 99%

Contact and Mobility Simulation for Mechanical Assemblies Based on Skin Model Shapes

Schleich

Anwer

Mathieu

et al. 2015

Journal of Computing and Information Science in Engineering

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Assembly modeling as one of the most important steps in the product development activity relies more and more on the extensive use of computer-aided design (cad) systems. The modeling of geometric interfaces between the components of the assembly is of central importance in the simulation of mechanical assemblies. Over the past decades, many researchers have devoted their efforts to establish theories and systems covering assembly modeling. Although the product form or shape has been extensively investigated considering the nominal cad geometry, inevitable limitations can be reported. Computer aided tolerancing (CAT) systems provide simulation tools for modeling the effects of tolerances on the assembly but still lack of form deviation considerations. The skin model concept which stemmed from the theoretical foundations of geometrical product specification and verification (GPS) has been developed to enrich the nominal geometry considering realistic physical shapes. However, the digital representation of the skin model has been investigated only recently. This paper presents a novel approach for a skin model based simulation of contact and mobility for assemblies. Three important issues are addressed: the geometric modeling of the contact, the contact quality evaluation, and the motion analysis. The main contribution to CAT can be found in the analysis of the effects of geometric form deviations on the assembly and motion behavior of solid mechanics, which comprises models for the assembly simulation, for the contact quality evaluation, and for the motion analysis. A case study is presented to illustrate the proposed approaches.

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Variational modeling and assembly constraints in tolerance analysis of rigid part assemblies: planar and cylindrical features

Cited by 39 publications

References 13 publications

Root Cause Analysis of Product Service Failures in Design-A Closed-loop Lifecycle Modelling Approach

Root Cause Analysis of Product Service Failures in Design-A Closed-loop Lifecycle Modelling Approach

An algorithm for CAD tolerancing integration: Generation of assembly configurations according to dimensional and geometrical tolerances

Contact and Mobility Simulation for Mechanical Assemblies Based on Skin Model Shapes

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