Fixture Design in Flexible Tooling of Aircraft Panel Based on Thin Plate Theory

Pan, Zemin; Liu, Ying; Sun, Zewei; Chang, Songyang; Fang, Qiang

doi:10.1155/2022/6602155

Cited by 3 publications

(1 citation statement)

References 28 publications

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“…The fixture has the function of ensuring the stability of machining, providing reliable positioning and clamping for the workpiece [9] [10]. However, due to the weak rigidity of the spherical shell workpiece, which is prone to clamping deformation under the action of the clamping force, which will affect the dimensional accuracy and surface quality of the product [11] [12].…”

Section: Introductionmentioning

confidence: 99%

Support-absorption composite clamping static response prediction and clamping deformation suppression

Fang,

Liu,

Zhao

et al. 2024

Preprint

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Thin-walled spherical shells are weakly rigid and prone to clamping deformation under clamping force, which will affect machining accuracy. In this paper, the support-absorption composite clamping method is proposed and the in-situ conformal clamping strategy is obtained through the deformation coordination optimization. Firstly, the thin-walled spherical shell static response model is established, and the displacement analytic solution of equivalent constraint superposition is proposed by decoupling load and boundary constraint and Reisner's force-displacement hybrid method. Then, the vacuum generation of the Laval nozzle and pressure regulation mechanism is elucidated, and the matching mechanism of vacuum degree and spring support is revealed. Considering the support and adsorption deformation coordination optimization, the in-situ conformal clamping model is constructed. Next, the simulation explores the response of thin-walled spherical shells at different positions and adsorption effects on different wall thicknesses. The applied velocity ratio of the load in in-situ conformal clamping is analyzed. Finally, comparative experiments with different clamping methods are carried out and the results show that: Larger deformation in the top ± 10° range. The average prediction error of the theoretical model is 11.97%. With a larger load, the larger deformation, and recommended to control within 0.5Mpa. A larger number of partitions isn't recommended, nonlinearities could cause larger acceleration mutations. The thinner the thickness or the smaller the support load, the support-adsorption composite clamping effect is more obvious, the maximum can reduce the clamping deformation by 64.3%. In-situ conformal clamping method can reduce the deformation of the clamping process by 33.3%.

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Section: Introductionmentioning

confidence: 99%

Support-absorption composite clamping static response prediction and clamping deformation suppression

Fang,

Liu,

Zhao

et al. 2024

Preprint

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An improved grey wolf optimizer for minimizing drilling deformation and residual stress in AA2024 sheet

Wu,

Huang,

Zhang

et al. 2024

Int J Adv Manuf Technol

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Aiming at the problem of large deformation and residual stress after drilling of aircraft skin Aluminum Alloy 2024 (AA2024) sheet, an Improved Gray Wolf Optimizer (IGWO) is proposed to optimize its fixture layout to make the deformation and residual stress smaller. A layout coding scheme is designed to obtain the maximum deformation and residual stress under different fixture layouts.Then a kriging prediction model is developed with a prediction error of 3.7% for deformation and 2.2% for residual stress. The model is integrated with the IGWO to provide a comprehensive set of optimal solutions. The specific improvements of IGWO included initializing the population with good point set to increase population diversity, incorporation of Lévy flight to prevent local optimum, adjustable distance control parameter tuning for balance the global and local searches, and optimizing the population by non-dominated sort and crowding distance. Ultimately, experimental studies and algorithmic comparisons are carried out to verify the efficacy of both the proposed model and the algorithm.

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Differential equations of oscillation of thin plates with point bonding

Berikkhanova

Zholymbayev

Aniyarov

2023

Zeitschrift Für Naturforschung A

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The relevance of the research results presented in this article lies in the general concept of elasticity theory, which integrates the bases of theoretical-empirical physics, practical mathematics and the natural implementation of modelling results in the fields of industrial (to a large extent in the design and manufacture of aircraft and naval aircraft shells and fuselages), construction (more so in the design and formation of multi-layer building structures), electronics and other areas of the science and industry complex. The aim of the study is to form a mathematical model of thin plate vibration based on a system of differential equations for the computational case of point bonding. The method of scientific search (Multilocal Literature Review) is used to achieve the set goal, which made it possible to establish the actual scientific-theoretical basis of the investigated problem, the method of mathematical modelling allowing to systematize the systems of differential equations developed earlier and formed in the framework of the present study, both for the general concept of the theory of elasticity of thin plates and for a selected calculation situation with partial constraints in the form of point bond imposing. As a result of the investigations conducted in the framework of this study, a mathematical model of the oscillations of thin plates bounded by special point-coupling conditions has been obtained, consisting of a system of differential equations obtained by successive iterations of mathematical transformations for the generated local boundary conditions. The mathematical model obtained is of practical scientific interest. The developed model environment forms a complete mathematical theory of elasticity for the formulated problem of the oscillatory process of thin plates with bounding point couplings. This problem has not received a satisfactory mathematical apparatus because of the complexity and cumbersomeness of analytical methods to describe the investigated elastic object.

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Fixture Design in Flexible Tooling of Aircraft Panel Based on Thin Plate Theory

Cited by 3 publications

References 28 publications

Support-absorption composite clamping static response prediction and clamping deformation suppression

Support-absorption composite clamping static response prediction and clamping deformation suppression

An improved grey wolf optimizer for minimizing drilling deformation and residual stress in AA2024 sheet

Differential equations of oscillation of thin plates with point bonding

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