Posture Optimization Algorithm for Large Structure Assemblies Based on Skin Model

Abstract

Geometric deviations inevitably occur in product manufacturing and seriously affect the assembly quality and product functionality. Assembly simulations on the basis of computer-aided design (CAD) package could imitate the assembly process and thus find out the design deficiencies and detect the assemblability of the components. Although lots of researches have been done on the prediction of assembly variation considering the geometric errors, most of them only simplify the geometric variation as orientation and position deviation rather than the manufacturing deformation. However, in machinery manufacturing, even if the manufacturing defects are limited, they could propagate and accumulate through components and lead to a noncompliant assembly. Recently, many point-based models have been applied to assembly simulation; however they are mainly interested in simulating the resulting positions of the assembled parts and lack the consideration of the postprocessing after positioning. This paper enriches the complete assembly simulation process based on skin model and presents a simple and effective posture evaluation and optimization method. The studied approach includes a software algorithm applied to evaluate the contact state of the assembly parts and a mathematical model based on the particle swarm optimization to acquire the optimal assembly posture. To verify the efficiency and feasibility of the proposed method, a case study on the aircraft wing box scaling model assembly is performed.

Optimisation for clamping force of aircraft composite structure assembly considering form defects and part deformations

“…For the detailed information of point cloud processing, refer to our other article. 4 Thus, the mating surfaces between the actual panel and skeleton can be converted to the matching between the ideal panel surface and the equivalent skeleton surface. Therefore, a parametric FEA model was established on the basis of the theoretical model of the panel and the equivalent skeleton surface, as shown in Figure 7.…”

“…This best-fit assembly posture can reduce shim usage. A separate paper of our previous research work 4 adopted the method of measurement assisted assembly to optimise and adjust the position and posture of the wing box panel according to the actual gap values to realise the active distribution of the assembly gap. Zhang et al 5 proposed an optimisation method to optimise the pressing force of the assembly gap in composite airframe structure, but the gap is idealised as a uniform gap, which cannot reflect the actual situation.…”

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“…Thyroid diseases encompass a wide range of conditions affecting the thyroid gland, an essential component of the endocrine system that regulates metabolism and influences various bodily functions [1]. Timely and accurate diagnosis of thyroid disorders is pivotal for effective medical intervention and patient care [2].…”