Applications of Mating Conditions in Assembly Sequence Planning Task

1998 ◽  
Author(s):  
Pongsak Dulyapraphant ◽  
Tulga Ozsoy
Keyword(s):  
Degrees Of Freedom ◽  
Tolerance Analysis ◽  
Assembly Sequence Planning ◽  
Assembly Model ◽  
Assembly Sequence ◽  
Kinematics Analysis ◽  
Sequence Planning ◽  
Planning Task ◽  
Intuitive Interface ◽  
Mating Conditions

Abstract Because of their intuitive interface, mating conditions have been prevalently used in assembly modelling. Besides their use for modelling purposes, other type of information, such as spatial relationships between parts and local degrees of freedom, can be directly derived from mating conditions. This information in turn can be used in various engineering analysis applications, such as kinematics analysis or automatic tolerance chain generation for tolerance analysis. In this paper, application of mating conditions in an assembly sequence-planning task is investigated. The proposed approach mainly engages the mating information represented in the CAD assembly model to automatically generate sequence plans based on the minimization of the number of assembly directions.

Assembly Modeling for 3D Component Based on Polychromatic Sets

2011 ◽  
Vol 411 ◽  
pp. 388-392 ◽  
Author(s):  
Yun Long Li ◽  
Jian Min Gao ◽  
Lei Shi ◽  
Song Wang
Keyword(s):  
Information Matrix ◽  
Spatial Location ◽  
Assembly Sequence Planning ◽  
Assembly Model ◽  
Assembly Sequence ◽  
Assembly Modeling ◽  
Sequence Planning ◽  
Location Modeling ◽  
Dynamic Interference

In order to improve the efficiency of assembly modeling and provide a complete assembly model for assembly sequence planning (ASP), a method of assembly modeling based on polychromatic sets (PS) is proposed. Firstly, the assembly information of 3D Component is obtained by API function in SolidWorks. In addition, assembly incident matrix, information matrix and mapping matrix are built. On the basis of these matrixes, a method of location modeling is explored. The interference relation matrix is developed by judging the spatial location and analyzing dynamic interference relation among parts. Finally, a case study is given to verify the method.

The Two Phased Method of Hull Block Assembly Sequence Planning

2011 ◽  
Vol 421 ◽  
pp. 235-239
Author(s):  
Shi Peng Qu ◽  
Zu Hua Jiang
Keyword(s):  
Constraint Satisfaction ◽  
Constraint Satisfaction Problem ◽  
Assembly Sequence Planning ◽  
Assembly Process ◽  
Assembly Model ◽  
Assembly Sequence ◽  
Hierarchical Assembly ◽  
Sequence Planning ◽  
Whole Process ◽  
Block Based

A hull block assembly sequence planning (ASP) problem is modeled as a constraint satisfaction problem where the precedence relations between operations are considered constraints. In order to generate the proper assembly sequence of the hull block, we analyzed the structure features of the block and built the hierarchical assembly model of the block. Based on this model, we divided the whole process of the block assembly into the small subassembly phase and the unit subassembly phase. There exists the rule that the assembly process of the subassembly in the same phase is similar, and it's different to the subassembly in the different phases. So, we proposed the different methods to plan the assembly sequence of the different phases. An example is given to illustrate that this two phased method can solves the block ASP problem effectively and accurately.

Assembly Modeling and Sequence Planning Based on the Kinematics of Features

1996 ◽  
Author(s):  
Zhi-Kui Ling
Keyword(s):  
Degrees Of Freedom ◽  
Planning Process ◽  
Assembly Sequence Planning ◽  
Degree Of Freedom ◽  
Assembly Planning ◽  
Assembly Sequence ◽  
Assembly Modeling ◽  
Sequence Planning ◽  
Local Degree ◽  
Modeling Strategy

Abstract A feature-based model is proposed for assembly sequence planning automation. The fundamental assembly modeling strategy for a product is based on the mating features of its components. The objectives of this study are to integrate assembly planning of a product with its CAD model, generate a correct and practical assembly sequence, and establish a software system to carry out the planning process. A disassembly approach in assembly planning is used in this study. The degree of freedom information between two mating features is used to characterize their kinematic conditions. The intersection calculation of the degrees of freedom on all features of a component provides its local degree of freedom which is used to set up functional precedence relationship. In some cases where functional precedence relationship can not be detected by geometric reasoning, clipping of the known “common sense” relationship is applied by an user. A bounding box checking approach is used to ensure no global collision during assembly. Furthermore, a set of criteria and heuristic rules based on assembly feasibility, manipulability, assembly direction, cost and stability is used to choose a good assembly sequence.

Research of the Assembly Model Based on Parts Attribute Semantic

2014 ◽  
Vol 509 ◽  
pp. 147-151
Author(s):  
Ya Jun Yang ◽  
Hong Gen Fang ◽  
Hao Luan ◽  
Tian Guo Jin
Keyword(s):  
Competitive Advantage ◽  
Matrix Model ◽  
Assembly Sequence Planning ◽  
Two Dimensional ◽  
Assembly Model ◽  
Assembly Sequence ◽  
Sequence Planning ◽  
Model Based ◽  
Dimensional Matrix ◽  
Precedence Relations

Aiming at the problems in the modeling of assembly sequence planning, this paper proposes a assembly model based on the semantic and two-dimensional matrix which is easy to calculate and expression. The paper complement the parts attribute semantic and it is used to make the assembly model .So the parts about the attributes of parts assembly can be used in the ASP. Assembly relations including Assembly Precedence Relations (APRs), Contact semantic, Connection and Transmission semantic are transformed into a matrix model. Finally shaft structure is used as a example to represent a competitive advantage of this model.

Toward an integrated CAD assembly sequence planning solution

2014 ◽  
Vol 229 (16) ◽  
pp. 2987-3001 ◽  
Author(s):  
Riadh Ben Hadj ◽  
Moez Trigui ◽  
Nizar Aifaoui
Keyword(s):  
Automatic Generation ◽  
Assembly Sequence Planning ◽  
Assembly Model ◽  
Assembly Sequence ◽  
Industrial Products ◽  
Sequence Planning ◽  
Simulation Algorithms ◽  
Great Development

Assembly sequence planning has drawn the attention of many researchers over the last years. Despite, the great development of CAD software in many aspects (simulation algorithms, interfaces, and ergonomics), automatic generation of assembly sequence planning from CAD assembly remains an issue to improve especially with the increasing complexity of industrial products. In this paper, an approach of assembly sequence planning generation from a CAD assembly model is presented. In order to generate feasible assembly sequence planning, the developed approach begins with the exploration of CAD assembly. Then, a collision analysis is performed to identify all possible obstacles during the components’ motion. An example of CAD assembly is presented in all sections of this paper in order to demonstrate the efficiency of the proposed approach.

Assembly Sequence Planning by Using Multiple Random Trees Based Motion Planning

2012 ◽  
Author(s):  
Carlos Morato ◽  
Krishnanand Kaipa ◽  
Satyandra K. Gupta
Keyword(s):  
Motion Planning ◽  
Assembly Sequence Planning ◽  
Random Trees ◽  
Planning System ◽  
Assembly Model ◽  
Assembly Sequence ◽  
Disassembly Sequence Planning ◽  
Sequence Planning ◽  
Disassembly Sequence ◽  
Assembly Sequences

In this paper, we introduce multiple random trees based motion planning to perform assembly sequence planning for complex assemblies. Initially, given an assembly model, our technique performs disassembly sequence planning. This approach dynamically reduces the size and complexity of the assembly based on a hierarchical exploration structure that keeps information about the completion of the disassembly. Next, the disassembly information is used to generate feasible assembly sequences, along with precedence constraints, to assemble each part into the current subassembly. The motion planning system chooses part order by detecting geometrical interferences and analyzing feasible part movements. Results from tests on a variety of complex assemblies validate the efficiency of our approach.

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