A new accuracy design for a 6-dof docking mechanism

Li, Jianguang; Ding, Jian; Yao, Yingxue; Fang, Honggen

doi:10.1177/0954406215570385

Cited by 10 publications

(8 citation statements)

References 25 publications

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“…Taguchi-like methods have been proposed with different experimental designs to take into account kinematic and dynamic parameters [101,102], joint clearances and additional errors from assembly and operating conditions [103], and sets of poses of the mechanism with reduction to a single performance index [104]. Both experimental and optimization methods have been attempted for specific types of mechanisms such as robotic manipulators [105,106]. A related problem has also been addressed for machine tools through the statistical analysis of multibody models [107].…”

Section: Tolerance Allocation On Linkagesmentioning

confidence: 99%

Concurrent optimization of dimensions and tolerances on structures and mechanisms

Armillotta

2020

Int J Adv Manuf Technol

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The paper deals with a problem of robust optimization of mechanical assemblies, which combines the allocation of tolerances with the selection of dimensional parameters. The two tasks are carried out together with the aim of minimizing the manufacturing cost and the variation on an assembly-level functional characteristic. The problem is addressed in the specific context of planar linkages used in structures and mechanisms. The proposed solution is based on an optimality condition involving both tolerances and dimensions, which allows to define a joint optimization problem avoiding the need of two sequential optimization phases. The condition is developed with the method of Lagrange multipliers using an expanded formulation of the reciprocal power cost-tolerance function. The optimal tolerances depend on the stackup coefficients of the output characteristic, which are calculated with a tolerance analysis method based on a static analogy. The procedure is demonstrated on two examples to illustrate some application details and discuss potential advantages and limitations.

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Section: Tolerance Allocation On Linkagesmentioning

confidence: 99%

Concurrent optimization of dimensions and tolerances on structures and mechanisms

Armillotta

2020

Int J Adv Manuf Technol

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“…Insight on parameter variances of this mechanism was provided with the sensitive maps, and the efficiency and practicality were demonstrated with the proposed method. Li et al (2015) investigated the tolerance design problem of a 6-DOF space docking mechanism using uniform design, and concerned the efficiency and precision of MC simulation in DOE. The tolerance of the component in the mechanism was properly broadened without any loss of output accuracy, and the manufacturing cost was reduced to a certain extent.…”

Section: Mechanism Tolerance Synthesis Reviewmentioning

confidence: 99%

“…We have found that as the dimension of a problem increases, the priorities in analytical precision and efficiency based on NTM are more significant over traditional Monte Carlo simulation. This simulation belongs to a 12-dimension problem, and Li et al had applied Sobol-set based MC in tackling accuracy analysis problem of a six-dof docking mechanism with 42 dimensions (Li et al, 2015). as the dimension increases, the pseudo-random cannot guaranty the investigated space where the high-dimension points uniformly are scatted.…”

Section: Effectiveness Comparisonmentioning

confidence: 99%

“…It ranges from tolerance initialization to final reasonable tolerance determination, in which constraints such as manufacturing capability, performance quality and production cost are considered (Moroni and Polini, 2003;Pasupathy et al, 2003). There are two problems to be addressed: (a) how the mechanism tolerance is assigned, so that manufacturing complexity is reduced without much loss in quality (Singh et al, 2009a;Chen and Ji, 2005;Chlebus and Wojciechowska, 2016;Jeang, 2001;Lyu et al, 2006;Rout and Mittal, 2006, 2008Li et al, 2015); and (b) how the synthesis ap-proach is devised so that process data can be promoted in precision and efficiency (Singh et al, 2009b;Huang, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Design of experiment-based tolerance synthesis for a lock-or-release mechanism of the Chinese Space Station Microgravity Platform

Ding

Liu

et al. 2019

Mech. Sci.

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Abstract. This paper deals with the tolerance synthesis with the application for a typical Lock-or-Release (L/R) mechanism, used for Chinese Space Station Microgravity Platform (SSMP). The L/R mechanism is utilized to lock the SSMP maintaining space position during the launching stage, and to release the SSMP automatically during on-orbit stage. Manufacturing accuracy of L/R mechanism presents direct influence on its kinematic and dynamic behaviors. Tolerance synthesis can provide a reasonable assignment of tolerance, satisfying the critical assembly criteria while lowering manufacturing complexity. In this paper, based on the number-theory method (NTM), a Halton-set based Monte Carlo (MC) simulation is introduced in the accuracy model of the L/R mechanism, aiming at improving analytical precision and efficiency for tolerance synthesis. A design of experiment (DOE) based tolerance synthesis approach is proposed. With initial tolerance determined by capacity, sensitivities of different tolerance factors are generated through the first DOE stage, and then applied to determine feasible tolerance levels. The final tolerance assignments, like points scatted in high-dimensioned space with inherent uniformity, are then produced through uniform DOE in the second stage. Result shows that the majority of feasible tolerance assignments generated have more relaxed tolerance, which can facilitate the manufacturing process.

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“…Pose accuracy of 6-degrees of freedom (dof) docking mechanism as one of the critical indexes in assembly quality control process does not only demand a higher dimensional precision of components but also requires a higher success rate for assembly work. 1,2 To lower the pose errors and improve success rate of the mechanism assembled, the prediction on assembly performance is essential before assembly process is implemented in workshop. The recently developed virtual manufacturing technology provides an effective support for this work.…”

Section: Introductionmentioning

confidence: 99%

Research on distribution pattern for central pose errors of 6-degrees of freedom docking mechanism

Ding

Guo

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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Central pose errors involving central position error and central orientation error are critical indexes for 6-degrees of freedom docking mechanism assembly quality. The performance of assembly could be evaluated during virtual assembly stage in terms of these indexes. However, the evaluation process for assembly has to employ Monte Carlo simulation, which leads to huge computation cost and usually makes the process impossible. This paper gives an insight of the relation between central pose errors and structural errors and finds that the central position error and central orientation error of docking mechanism conform to Rayleigh distribution model at symmetric pose configuration. In comparison, the maximum difference between results with Rayleigh model-based assembly performance and Monte Carlo simulation-based one is no more than 1.22%. With this model, the evaluation process for assembly performance could be facilitated significantly.

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A new accuracy design for a 6-dof docking mechanism

Cited by 10 publications

References 25 publications

Concurrent optimization of dimensions and tolerances on structures and mechanisms

Concurrent optimization of dimensions and tolerances on structures and mechanisms

Design of experiment-based tolerance synthesis for a lock-or-release mechanism of the Chinese Space Station Microgravity Platform

Research on distribution pattern for central pose errors of 6-degrees of freedom docking mechanism

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