Numerical Process Based on Measuring Data for Gap Prediction of an Assembly

Lacroix, Cyril; Mathieu, Luc; Thiébaut, François; Douilly, Marc; Falgarone, Hugo

doi:10.1016/j.procir.2015.04.050

Cited by 13 publications

(7 citation statements)

References 4 publications

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“…Manohar et al [3] proposed a shim prediction technique based on machine learning and sparse sensing for the complicated and cumbersome problem of gap filling work. Lacroix et al [4] developed a numerical method to predict the size and distribution of the gap before assembly by measuring the shape of components. Falgarone et al [5] developed ANATOLEFLEX software and used it to simulate the assembly process of nonrigid parts.…”

Section: Research Backgroundmentioning

confidence: 99%

“…Wang et al [13] proposed an optimal posture evaluation model to control the gaps in the assembly work. As the gap reaches the minimum value and it is within the tolerance range, the component reaches the optimal posture [4]. Dong et al [14] established a parametric finite element model for the assembly problem of composite and metal structures.…”

Section: Research Backgroundmentioning

confidence: 99%

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Effect of Gap and Shims on the Strain and Stress State of the Composite-Aluminum Hybrid Bolted Structure

Yue

et al. 2020

International Journal of Aerospace Engineering

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The composite-aluminum hybrid bolted structures are widely used in aircraft. Due to low molding accuracy of composite components, gaps always occur between components during assembly. In this case, the bolt connection can cause a complex strain and stress state of component. It may adversely affect the mechanical properties or cause local damage of the structure. A simplified model of the composite-aluminum assembly structure was established in this paper. Then, the influence of forced assembly, liquid shim, and peelable fiberglass shim on the strain and stress state of the composite-aluminum hybrid bolted structure was studied. A bolt connection experimental device was designed to apply a preload to the specimen. The strain field on the specimen surface was measured using the 3D-DIC strain measurement system. The finite element model was established to study the interlaminar stress and damage state of composite laminates. It is found that the strain of specimen in the X -direction is mainly affected by the bending deformation, while the strain in the Y -direction is mainly affected by the compression of bolt head. For composite laminates, the strain value in the X -direction can be reduced by 8.31%-70.97% with shims. As for the strain value in the Y -direction, the liquid shim can only reduce it up to 23.93%when the gap is large. In addition, the liquid shim and peelable fiberglass shim cannot reduce the stress value of all interlaminar elements, but it can make the stress distribution more uniform and improve the stress state of the interlaminar element when the shim was more than 0.8 mm.

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Section: Research Backgroundmentioning

confidence: 99%

Section: Research Backgroundmentioning

confidence: 99%

Effect of Gap and Shims on the Strain and Stress State of the Composite-Aluminum Hybrid Bolted Structure

Yue

et al. 2020

International Journal of Aerospace Engineering

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“…To evaluate the accuracy of assembly of two surfaces, one can use CAD models of both real surfaces, associate these models in CAD software to simulate elements closure, and then determine a spatial CAD model of the gap between the surfaces. Such a solution for freeform surfaces is described by Groch et al in [7], and for primitive surfaces in works [8,9]. To develop CAD models of real surfaces, the results of digitizing these surfaces are necessary.…”

Section: Introductionmentioning

confidence: 99%

Simulation for Gap Estimation of Freeform Surfaces Assembly Based on Complex Measurement Data

Poniatowska,

WERNER,

Wojtowicz

2024

Preprint

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This paper presents a simulation method for evaluating the accuracy of assembly of two mating freeform surfaces based on the spatial CAD model of the gap between the surfaces. CAD models of actual surfaces are the basis for determining the gap model. Digital measurement data representing form profiles are determined in measurements on a coordinate measuring machine according to a regular grid of points, and data representing waviness and surface roughness on a profilometer. The SGP components separated in the measurement process are summed up in the CAD modeling process. In the next step, a closure simulation is carried out by docking the inverted complex model of one surface to the surface model of the other surface. In this way, a spatial complex CAD model of the gap between the surfaces is obtained, mapping the effect of all the components of the irregularity on the tightness of the assembly. Based on the obtained model, it is possible to determine its maximum dimension (estimate the local width of the gap between actual surfaces) and the average of local dimensions, but also to illustrate the detailed distribution of local dimensions of this model in the form of a color map. The effectiveness of the proposed method was verified experimentally for the closing surfaces of the elements of the injection mold (cavity and core).

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“…Benichou and Anselmetti 26 used thermal deformation in a tolerance analysis model and analyzed the influence of thermal expansion on product clearance. Lacroix et al 27 combined finite element analysis with measurement data of parts to analyze assembly accuracy, which integrated measurement and calculated data. Cheng et al 28 proposed a virtual assembly method based on the triangular plane model and Laplace operator, and it had a high solving speed and efficiency.…”

Section: Introductionmentioning

confidence: 99%

Tolerance analysis method considering multifactor coupling based on the Jacobian–torsor model

Yang

Gao

2022

Advances in Mechanical Engineering

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Assembly quality affects the performance of mechanical products and reasonable tolerance designs are central to assembly quality. Unreasonable tolerance design leads to the mechanical equipment performance degradation under complex operating conditions. This study developed a novel tolerance analysis method that considers the influence of temperature, load, and other environmental factors based on the Jacobian–torsor and skin models. First, the deformation caused by multifactor coupling was analyzed using the finite element method, and the feature surface of deformation is extracted. Second, the deformation extraction and tolerance conversion based on the new generation geometrical product specification theory was used to convert the deformation of the feature into the dimension, orientation, and form tolerance. Third, the modified Jacobian–torsor model considering multifactor coupling was constructed by superimposing the converted tolerance with the design tolerances. Finally, the abrasion problem of the airborne actuator was considered as an example to verify the effectiveness and accuracy of the novel method. Through the accurate calculation of tolerances, it accurately analyzes the assembly state of the product under the influence of environmental factors, and provides more accurate guidance for the design and optimization of product tolerance in complex working conditions.

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Numerical Process Based on Measuring Data for Gap Prediction of an Assembly

Cited by 13 publications

References 4 publications

Effect of Gap and Shims on the Strain and Stress State of the Composite-Aluminum Hybrid Bolted Structure

Effect of Gap and Shims on the Strain and Stress State of the Composite-Aluminum Hybrid Bolted Structure

Simulation for Gap Estimation of Freeform Surfaces Assembly Based on Complex Measurement Data

Tolerance analysis method considering multifactor coupling based on the Jacobian–torsor model

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