Assembly sequence influence on geometric deviations propagation of compliant parts

Mounaud, Mathieu; Thiébaut, François; Bourdet, Pierre; Falgarone, Hugo; Chevassus, Nicolas

doi:10.1080/00207540903460240

Cited by 20 publications

(12 citation statements)

References 15 publications

(14 reference statements)

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“…They are typically performed after complementary defect identification has concluded. Their role is to predict various consequences like the optimal assembly sequence and its effects on the final shape of a flexible part in an assembly [22], the post-assembly shape of a flexible part under normal lighting conditions [23], or the required assembly boundary conditions to insure a post-assembly shape that closely resembles the nominal CAD [24].…”

Section: ) Flexible Registration (With Complementary Defect Identifimentioning

confidence: 99%

The fixtureless inspection of flexible parts based on semi-geodesic distance

Babanezhad

Foucault

Sabri

et al. 2019

Precision Engineering

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Some types of manufactured parts like sheet metals and skins often have a significantly different shape in a free-state position compared to their state-of-use position (as defined by their nominal CAD models) due to a combination of gravity and/or the residual effects of stress. Traditionally known as flexible (nonrigid compliant) parts, these dedicated fixtures are used for inspection operations in order to maintain flexible parts from a free-state position to a state-of-use position. This paper introduces a new automatic defect identification method primarily intended for two less-investigated manufacturing defect types: contour profile errors and hole localization. By combining simple techniques such as mesh boundary detection, fast boundary-based correspondence searches and accurate fast marching on triangulated meshes, the semi-geodesic distances from each boundary vertex on the acquired SCAN mesh to all the other boundary vertices is calculated, stored in a table and then compared to the corresponding values on the part's nominal CAD mesh. The comparisons found in the tables result in an estimation of the location and amplitude of the two aforementioned defect types. Compared to other work in this field, the overall approach does not rely on any mesh registration or finite-element analysis with tedious boundary conditions setup. It is also relatively fast. A fast algorithm/app based on this method was named the AFDA (Automatic Free-state Defect Approximation) and was validated against case studies in the aerospace sector. The results reflect the utility and effectiveness of the proposed approach.

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Section: ) Flexible Registration (With Complementary Defect Identifimentioning

confidence: 99%

The fixtureless inspection of flexible parts based on semi-geodesic distance

Babanezhad

Foucault

Sabri

et al. 2019

Precision Engineering

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“…Best fit assembly considering behavior of components was studied using a helicopter door assembly use case [2]. Also, the assembly sequence influence on geometric deviations of parts was studied using a hydraulic system assembly case [3].…”

Section: Background Research Base Of This Workmentioning

confidence: 99%

Flexible Best Fit Assembly of Large Aircraft Components. Airbus A350 XWB Case Study

Arista

Falgarone

2017

Product Lifecycle Management and the Industry of the Future

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The need for assembly parts and structures where the perfect fitting is not guaranteed due to manufacturing/assembly tolerances and/or the influence of several physical effects, i.e. gravity, is increasing constantly in different industrial sectors and in particular in the aerospace industry. Some techniques have been developed to deal with it. In the field of large aero structures, custom-made parts using reverse engineering techniques are used to machine parts whose geometry requires to be customized for each produced aircraft. In the field of aircraft shells, a technique based on the characteristics of non-rigid components that can be slightly deformed to clear geometrical conditions by controlled forces to strain within its stress limits. FITFLEX project exploit this last technique and was carried out by Airbus Group Innovations and Airbus. The objective is supporting the Airbus A350 XWB ramp-up and the current manual positioning process of the shell by force control, defining a measurement based assembly including a flexible best-fit system. The case subject of study on FITFLEX project is the A350 XWB rear fuselage, a 14 meters by 5 meters side shell positioning process.

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“…The concern of geometrical quality of the assembled product (commonly called tolerancing) is therefore coupled with the assembly process planning. Up to this point, the geometrical tolerances allocated to the components to be assembled may be part of the information contained in a comprehensive assembly process plan [7,12,13].…”

Section: Component Geometrical Tolerancesmentioning

confidence: 99%

“…In this work, only geometrical KC are considered. Tolerancing studies commonly provide a sensitivity matrix S to link the geometrical deviations δl 4 to the KC deviations δKC as in (3Non-Conformity Rateequation.1.2.3) [12,14,13].…”

Section: Assembly Plan Evaluationmentioning

confidence: 99%

Assisted Decision-Making for Assembly Technique Selection and Geometrical Tolerance Allocation

Andolfatto

Thiébaut

Lartigue

et al. 2013

Lecture Notes in Production Engineering

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Assembly process planning involves many aspects from geometrical matters to operational research. Though, the literature shows very few works about assembly technique selection. This paper deals with an original method to select assembly techniques and to allocate component geometrical tolerances in order to minimize the product cost and to maximize the conformity rate associated with the assembly plan. The data structures used to define a parametric assembly plan is detailed. This data structure is used to formulate a multi-objective optimization problem reflecting the concerns of the study. The entire method is illustrated trough a case study. The results obtained are presented and followed by a discussion about the potential benefits of its application in an industrial context. The useful support that this method can provide to decision-making is highlighted. Its shared point of view from product designers to manufacturing process designers makes it an efficient tool for concurrent engineering.

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Assembly sequence influence on geometric deviations propagation of compliant parts

Cited by 20 publications

References 15 publications

The fixtureless inspection of flexible parts based on semi-geodesic distance

The fixtureless inspection of flexible parts based on semi-geodesic distance

Flexible Best Fit Assembly of Large Aircraft Components. Airbus A350 XWB Case Study

Assisted Decision-Making for Assembly Technique Selection and Geometrical Tolerance Allocation

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