A novel kinematic accuracy analysis method for a mechanical assembly based on DP-SDT theory

Xuan, Zhou; Li, Hai; Zhu, Haiping

doi:10.1007/s00170-017-1105-4

Cited by 8 publications

(2 citation statements)

References 29 publications

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“…Liu et al 8 established the mathematical models of dimensional tolerance, orientation tolerance, geometric tolerance, which promoted the further development of the tolerance modeling theory. Zhou et al 9 established the mathematical expression of geometric error variation under multi tolerance coupling by adopting the SDT theory, and realized the construction of tolerance model. Rahman et al 10 applied the homogeneous coordinate transformation theory and multi-body kinematics to the machining center, and then constructed a 3D tolerance mathematical model including the thermal deformation deviation of the part surface.…”

Section: Introductionmentioning

confidence: 99%

Novel application of mapping method from small displacement torsor to tolerance: Error optimization design of assembly parts

Yuan

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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The manufacturing/assembly error of machine parts is a key factor that influences the performance and economy of mechanical systems. To achieve high assembly precision and performance on the basis of low manufacturing accuracy and cost, this study primarily optimizes the assembly error of machine parts. First, the small displacement torsor is used to characterize the small deformation between the mating surfaces of parts. Subsequently, to realize the combination of small displacement torsor and tolerance, the small displacement torsor with manufacturing error and assembly deformation is mapped to the tolerance domain. Second, based on the relationship between small displacement torsor and tolerance, an assembly error optimization model is established on the basis of the conventional tolerance-cost model, considering the emergence of manufacturing error and assembly deformation. Third, aiming at the high-pressure rotor for aeroengines, the error optimization design of assembly is carried out developed with the assembly accuracy requirement as the constraint condition, and the total costs of the manufacturing and assembly processes as the objective. The optimization results indicate that the manufacturing error range of each mating surface after optimization changes, from small to large, under the premise of ensuring the product’s performance, which verifies that the difficulty in processing parts is reduced, and that the efficiency of parts processing is also improved. Meanwhile, the relative manufacturing cost after optimization is reduced by 6.79%, which reflects the economic requirements to a certain extent. The content of this article provides the necessary design basis and reference for the realization of high assembly accuracy of mechanical systems, under low cost requirements from the design perspective.

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Section: Introductionmentioning

confidence: 99%

Novel application of mapping method from small displacement torsor to tolerance: Error optimization design of assembly parts

Yuan

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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show abstract

“…The analysis of engine assemblies was performed by this modified model in his study. Concerning kinematic accuracy analysis, the small-displacement torsor model was used in the study conducted by X. Zhou [24]. However, the application was still bound up with the static assembly processing, which limits the use of tolerance theory.…”

Section: Introductionmentioning

confidence: 99%

Tolerance Design and Robust Study for The Joint Clearances of Landing Gear Retraction Mechanisms

2020

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Joint clearances inevitably affect the kinematic accuracy and robustness of landing gear retraction mechanisms. However, the complexity and uncertainty of the clearances lead to difficulty in establishing mathematic models and analyzing effects. In the interest of assessing the clearance effects on the kinematic accuracy of landing gears, an integrated tolerance theory is proposed in this paper. In the theory proposed, Jacobian–Torsor model is combined with robust analysis to establish the kinematic accuracy model and predict the influences of clearances. The overall steps to apply the theory presented in practice are given. A typical landing gear retraction mechanism is chosen for the case study and the results show that the tendencies of clearances can be observed. Through the process of tolerance design, robust study, and tolerance redesign, the kinematic accuracy is significantly improved. The integrated tolerance theory proposed and the study conducted will provide designers new insights for the clearance analysis of landing gear mechanisms.

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Assessment of large-scale assembly coordination based on pose feasible space

Cui

2019

Int J Adv Manuf Technol

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A novel kinematic accuracy analysis method for a mechanical assembly based on DP-SDT theory

Cited by 8 publications

References 29 publications

Novel application of mapping method from small displacement torsor to tolerance: Error optimization design of assembly parts

Novel application of mapping method from small displacement torsor to tolerance: Error optimization design of assembly parts

Tolerance Design and Robust Study for The Joint Clearances of Landing Gear Retraction Mechanisms

Assessment of large-scale assembly coordination based on pose feasible space

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