A Note on Mechanical Feasibility Predicate for Robotic Assembly Sequence Generation

Bahubalendruni, M. V. A. Raju; Biswal, Bibhuti Bhusan; Kumar, M. Ashok; Deepak, B. B. V. L.

doi:10.1007/978-81-322-2740-3_38

Cited by 20 publications

(8 citation statements)

References 9 publications

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“…Connection offers limitations to components. Most of connections are carried out with support of physical connectors such as screws, nuts and bolts, rivets and joining pins (Bahubalendruni et al , 2015; Bahubalendruni et al , 2016). Tseng et al (2004) classified fasteners to fixed fasteners and movable fasteners.…”

Section: Methods For Generating Disassembly Tasks For Selective Disassemblymentioning

confidence: 99%

Generating disassembly tasks for selective disassembly using ontology-based disassembly knowledge representation

Jiang¹,

Zhu

et al. 2017

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Purpose This paper aims to develop methods for generating disassembly tasks for selective disassembly. The disassembly task contains the disassembly information, namely, disassembly direction, disassembly tool and selective disassembly sequence. Design/methodology/approach Ontology is adopted to represent the product, and ontology rules are used to represent the disassembly knowledge. A product ontology model (POM) is introduced on the basis of material, connection matrix and interference matrix. Two types of disassembly knowledge are taken into account, one is the disassembly knowledge of disassembly tool selection and the other is the disassembly knowledge of special connections. Based on the POM and the disassembly knowledge, decision support methods are designed to generate disassembly tasks. Findings A centrifugal pump is used to demonstrate the proposed methods, and the result shows that the methods work well. Research limitations/implications The methods developed in this study are fundamental approaches. The ontology and the ontology rules can be extended with more disassembly knowledge. Originality/value The main contribution of this research is the development of methods for representing disassembly knowledge based on ontology rules and the decision support methods for generating disassembly tasks.

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Section: Methods For Generating Disassembly Tasks For Selective Disassemblymentioning

confidence: 99%

Generating disassembly tasks for selective disassembly using ontology-based disassembly knowledge representation

Jiang¹,

Zhu

et al. 2017

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show abstract

“…In situation where stability predicate is taken into consideration as the main problem in the planning process, it is recommended to use a stability and support matrices. The significance of this predicate in ASP processes is emphasized in numerous scientific papers (Wang and Liu, 2013; Kumar et al , 2016; (Bahubalendruni and Biswal, 2016c; Bahubalendruni et al , 2016d).…”

Section: Literature Reviewmentioning

confidence: 99%

Self-classification of assembly database using evolutionary method

Iwańkowicz

Taraska

2018

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Purpose The purpose of the paper is to develop a method of automatic classification of the components of the assembly units. The method is crucial for developing an automatic ship assembly planning tools. The proposed method takes into account the assumptions specific for shipbuilding technology processes: high complexity of structures, difficult expert-based classification of components, fixed priority relations between connections resulting from geometrical constraints and demands of welding processes. Design/methodology/approach The set of ex post determined liaisons and assembly sequences constitutes the database of structures which have been made-up earlier. The components classification problem is solved using matrix coding of graphs. Information in such form is stored in the database. The minimization of number of cycles in the graph of classes sequence and minimization of diversity of classes within all constructions has been proposed as criteria of optimization. The genetic algorithm has been proposed as a solution method. Findings The proposed method solves the problem of components’ classifications. It allows setting the pattern of priorities between classes of various connections. This gives a chance to determine the relationship constraints between the connections of new structures for which assembly sequences are not established. Research limitations/implications Mathematical formulation of the database is quite laborious. The possibility of partial automation of this process should be considered. Owing to the complexity of the problem, a relatively simple objective function has been proposed. During a ship hull assembly, additional criteria should be taken into account, what will be the direction of further research. Practical implications Automatic classification of components is dedicated for implementation in shipyards and similar assembly systems. Tests performed by the authors confirm efficiency of presented method in supporting management of the database and assembly of new structures planning. Suggested activity-oriented approach allows for easy conversion of any assembly unit structure to the form of a matrix. Originality/value The new approach for components classification according to its assembly features distinguishes the proposed method from others. The use of nilpotent matrix theory in an acyclicity of graphs analysis is also a unique achievement. Original crossover and mutation operators for assembly sequence were proposed in the article.

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“…34 Review and note on the feasibility of sequence generation show more details for the treatments to dynamic assembly operations. 35,36 Spatial connectivity is primarily expressed by the liaison graphs or AND/OR graphs, which are then developed into liaison matrixes, precedence diagrams, and ordered binary decision diagrams. 37,38 Where one node represents one subassembly to simplify sequences, 39,40 and the positioning and contact feature can reduce the design spaces of sequences.…”

Section: Spatial Connectivitymentioning

confidence: 99%

A dynamic dimensional accumulation with propagations of part mating gaps for series-parallel assembly operations

Sun

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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The changing spring-back effects of part mating gaps restrict the control of the overall dimensional error for the parts assembled by many sequential and parallel processes. So far, it has been merely adjusted by component positions or compensated by some joining processes, which is still limited and lack of a theory and tool for the general dynamic process. To obtain the dimensional response of current assembly when the part contacts with the other, this paper proposes algebraic modelling for dimensional error accumulations that organize the propagation through every part. A new contact graph firstly expresses the part liaisons. Then, a variable array encodes the displacements and the time when each contact finishes, which yields algebraic theorems for the conversion of contact graph to algebraic expression, and for estimating dimensional distortions. If propagations take finite element methods, the algebraic expression outputs the coupled spring-back effects for the current assembled parts that support both variation and tolerance analyses. The dynamic accumulation with propagations is validated by case studies, and the comparison indicates that the assembly with the largest number of parallel modes has the highest nonlinear variations caused by locating errors.

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A Note on Mechanical Feasibility Predicate for Robotic Assembly Sequence Generation

Cited by 20 publications

References 9 publications

Generating disassembly tasks for selective disassembly using ontology-based disassembly knowledge representation

Generating disassembly tasks for selective disassembly using ontology-based disassembly knowledge representation

Self-classification of assembly database using evolutionary method

A dynamic dimensional accumulation with propagations of part mating gaps for series-parallel assembly operations

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