A Technique for Planar Contact Recognition in Automatic Assembly Planning

1996 ◽  
Author(s):  
Sa’id Golabi ◽  
Kazem Abhary ◽  
Lee H. S. Luong
Keyword(s):  
Assembly Planning ◽  
Solid Model ◽  
Automatic Assembly ◽  
Model Data ◽  
New Approaches ◽  
Assembly Sequences ◽  
Geometrical Data ◽  
Solid Part ◽  
Planar Contact ◽  
Selection Of

Abstract Recognition of all assembly sequences and selection of the most efficient one have been the main concerns of researchers in assembly planning during the last decade. Few of these researchers attempted to automatically generate assembly sequences using the geometric and solid model data of the product. To solve the problem of contact recognition a broad research was conducted to recognise contact between planar, cylindrical and conical faces during this research. This paper explains one of the techniques developed herein to recognise contact between two planar faces. The necessary geometrical data of a solid model has been extracted from AutoCAD. The method includes new approaches for detecting a point within the solid part of a face, and investigating the intersection of two curved edges.

Determining Interference Between Parts in CAD STEP Files for Automatic Assembly Planning

2005 ◽  
Vol 5 (1) ◽  
pp. 56-62 ◽  
Author(s):  
Chunxia Pan ◽  
Shana S.-F. Smith ◽  
Gregory C. Smith
Keyword(s):  
Data Access ◽  
Assembly Planning ◽  
File Format ◽  
Automatic Assembly ◽  
Model Data ◽  
Product Model ◽  
Cad Tools ◽  
Standard Data ◽  
Geometrical Data ◽  
Assembly Analysis

In this paper, a neutral file format—STEP (Standard for the Exchange of Product model data) is used to transfer geometrical data from CAD tools to assembly analysis tools. JSDAI (Standard Data Access Interface for STEP binding to JAVA) is used to read geometrical data from the CAD STEP files. After all necessary geometrical data is extracted from the CAD STEP files, the interference relationships between parts are analyzed. The methods developed for using JSDAI to extract geometrical data from CAD STEP files and for determining interference relationships between parts in the assemblies are introduced.

AUTOMATIC COLLISION DETECTION FOR ASSEMBLY SEQUENCE PLANNING USING A THREE-DIMENSIONAL SOLID MODEL

2011 ◽  
Vol 10 (02) ◽  
pp. 277-291 ◽  
Author(s):  
ALFADHLANI ◽  
T. M. A. ARI SAMADHI ◽  
ANAS MA'RUF ◽  
ISA SETIASYAH TOHA
Keyword(s):  
Free Path ◽  
Collision Detection ◽  
Three Dimensional ◽  
Assembly Sequence Planning ◽  
Detection Methods ◽  
Assembly Sequence ◽  
Sequence Planning ◽  
Assembly Sequences ◽  
Geometrical Data ◽  
Selection Of

Assembly sequence planning of a product involves several steps, including generation of precedence constraints, generation of assembly sequences, and selection of assembly sequences. Generation and selection of assembly sequences should be able to guarantee the feasibility of assembly. Assembly will be feasible if there is no collision between components when assembled. Detection of collision-free path of assembly can be done in an automated way. There are a number of collision detection methods that have been developed, but the method requires a complicated process of data geometry analysis. This paper proposes a method for detecting a collision-free path of the assembly component in a more simple way. Geometrical data required, taken from the three-dimensional (3D) solid drawing in the form of stacked drawing in computer-aided design (CAD) systems. Retrieval of geometrical data of components and detection of the collision-free path of an assembly were done in an automated way, directly from the CAD system.

HighLAP: A High Level System for Generating, Representing, and Evaluating Assembly Sequences

1997 ◽  
Vol 06 (02) ◽  
pp. 149-163 ◽  
Author(s):  
F. Röhrdanz ◽  
H. Mosemann ◽  
F. M. Wahl
Keyword(s):  
User Interaction ◽  
Planning System ◽  
Assembly Planning ◽  
Automatic Assembly ◽  
Level System ◽  
Mechanical Assembly ◽  
Plan Evaluation ◽  
Assembly Sequences ◽  
The Stability ◽  
High Level

In this paper we present our high level assembly planning system HighLAP·HighLAP generates and evaluates all assembly sequences of a mechanical assembly with minimal user interaction. For the evaluation of all feasible assembly sequences several criteria are taken into account. HighLAP considers for example the separability and the manipulability of the generated (sub)assemblies. Furthermore, the necessity of reorientation for a mating operation and parallelism during plan execution is considered. Another important criterion is the stability of the generated (sub)assemblies. Most of the assembly planners developed up to date use heuristics or user defined criteria to determine assembly stability for plan evaluation. In order to bring automatic assembly planning closer to reality HighLAP performs a powerful geometrical and physical reasoning. The presented system is the first assembly planning system taking into account the range of all stable orientations of an assembly considering friction for plan evaluation.

Structural Analysis of Product and Computer-Aided Assembly Planning in AssemBL Software Package

2018 ◽  
pp. 11-33
Author(s):  
A. N. Bozhko
Keyword(s):  
Computer Aided Design ◽  
State Of The Art ◽  
Graph Model ◽  
Design System ◽  
Assembly Planning ◽  
Complex Products ◽  
Assembly Sequences ◽  
Computer Aided ◽  
Cad Cam ◽  
Aided Design

Computer-aided design of assembly processes (Computer aided assembly planning, CAAP) of complex products is an important and urgent problem of state-of-the-art information technologies. Intensive research on CAAP has been underway since the 1980s. Meanwhile, specialized design systems were created to provide synthesis of assembly plans and product decompositions into assembly units. Such systems as ASPE, RAPID, XAP / 1, FLAPS, Archimedes, PRELEIDES, HAP, etc. can be given, as an example. These experimental developments did not get widespread use in industry, since they are based on the models of products with limited adequacy and require an expert’s active involvement in preparing initial information. The design tools for the state-of-the-art full-featured CAD/CAM systems (Siemens NX, Dassault CATIA and PTC Creo Elements / Pro), which are designed to provide CAAP, mainly take into account the geometric constraints that the design imposes on design solutions. These systems often synthesize technologically incorrect assembly sequences in which known technological heuristics are violated, for example orderliness in accuracy, consistency with the system of dimension chains, etc.An AssemBL software application package has been developed for a structured analysis of products and a synthesis of assembly plans and decompositions. The AssemBL uses a hyper-graph model of a product that correctly describes coherent and sequential assembly operations and processes. In terms of the hyper-graph model, an assembly operation is described as shrinkage of edge, an assembly plan is a sequence of shrinkages that converts a hyper-graph into the point, and a decomposition of product into assembly units is a hyper-graph partition into sub-graphs.The AssemBL solves the problem of minimizing the number of direct checks for geometric solvability when assembling complex products. This task is posed as a plus-sum two-person game of bicoloured brushing of an ordered set. In the paradigm of this model, the brushing operation is to check a certain structured fragment for solvability by collision detection methods. A rational brushing strategy minimizes the number of such checks.The package is integrated into the Siemens NX 10.0 computer-aided design system. This solution allowed us to combine specialized AssemBL tools with a developed toolkit of one of the most powerful and popular integrated CAD/CAM /CAE systems.

Romance and Latin approaches to word structure features

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Elisabeth Gibert-Sotelo ◽  
Isabel Pujol Payet
Keyword(s):  
The Other ◽  
Special Issue ◽  
Valuable Contribution ◽  
Field Of Study ◽  
Word Structure ◽  
New Approaches ◽  
Theoretical Approaches ◽  
Special Collection ◽  
Introductory Paper ◽  
Selection Of

Abstract The interest in morphology and its interaction with the other grammatical components has increased in the last twenty years, with new approaches coming into stage so as to get more accurate analyses of the processes involved in morphological construal. This special issue is a valuable contribution to this field of study. It gathers a selection of five papers from the Morphology and Syntax workshop (University of Girona, July 2017) which, on the basis of Romance and Latin phenomena, discuss word structure and its decomposition into hierarchies of features. Even though the papers share a compositional view of lexical items, they adopt different formal theoretical approaches to the lexicon-syntax interface, thus showing the benefit of bearing in mind the possibilities that each framework provides. This introductory paper serves as a guide for the readers of this special collection and offers an overview of the topics dealt in each contribution.

Filippova Automated planning of graduality assembly

2021 ◽  
pp. 28-44
Author(s):  
D. Proskurenko ◽  
◽  
O. Tretyak ◽  
M. Demchenko ◽  
M. Filippova ◽  
...  
Keyword(s):  
Computational Effort ◽  
Planning System ◽  
Assembly Planning ◽  
Component Part ◽  
Practical Implementation ◽  
Early Stages ◽  
Assembly Sequences ◽  
Assembly Operations ◽  
Communication Schedule ◽  
Relation Graph

Modern industrial production requires the improvement of assembly processes, and thus increase the level of automated intelligent sequence planning. Therefore, researches in the field of automation of the sequence of assembly of products in industries are relevant at this time. In today's world there is a need to develop complex, accurate products. Problems are created in industries due to the reduction of the life cycle of products. There is a need to study the problem of assembly planning to achieve the goal of practical implementation and standardization of assembly plans. Creating graphs of the addition process is one of the problems. The assembly planning system can reduce human intervention in the process and reduce computational effort. The finished assembly contains many components that can be assembled using many sequences. A review of the methods from the literature showed that although these methods increase the automation level, they still cannot be applied to actual production because they do not take into account the experience and knowledge that can play a major role in planning and are of great value. Assembly planning, relationship charts, priority charts. Improving the assembly planning system to create a communication schedule and an assembly priority schedule was proposed. The advanced system will be used to generate possible assembly sequences with subassembly identification. A system has been developed to create alternative possible assembly sequences that can be used by component part / product designers in the early stages. A system capable of generating assembly sequences for simultaneous assembly of multiple parts has been proposed. Conclusions and work results can be applied used and improved for more productive product development by designers in the early stages and faster assembly of products in enterprises. The paper did not consider practical limitations (gravity) and irreversible assembly operations, such as permanent fastening, welding etc. Кey words: assembly, blocking graph, relation graph, sequence

scholarly journals PECULIARITIES OF CORRECTING THE FIGURE AMONG WOMEN OF THE FIRST MATURE AGE PERIOD BY MEANS OF SHAPING TECHNIQUES IN ACCORDANCE WITH BODY TYPES

2021 ◽  
Vol 5 (1) ◽  
pp. 30-42
Author(s):  
Olga Kozhanova ◽  
Sergii Pitenko ◽  
Natalia Gavrilova ◽  
Evgeniya Tsуkozа ◽  
Hanna Hudym ◽  
...  
Keyword(s):  
Physical Condition ◽  
Body Shape ◽  
Current Practice ◽  
Control Group ◽  
Body Type ◽  
Adult Age ◽  
New Approaches ◽  
Sports Club ◽  
Experimental Group ◽  
Selection Of

Introduction. Currently, due to environmental and social problems, nervous strain, muscle inactivity, more and more people are starting to engage in health fitness in the hope of improving health, improving physical condition, learning how to deal with stress and lose weight. Nowadays, compared to other types of fitness, shaping classes have become more and more popular as an effective way to lose weight and body shape. Although shaping was originally developed as a system of individual classes, the current practice of group classes requires the search for new approaches in planning shaping programs: there is no research on the selection of exercises, volume and intensity of classes based on individual physiques of those involved. Aim: to increase the effectiveness of classes in order to correct the figure of women 21-35 years old through the use of shaping programs, taking into account their body types. Material and methods. The study involved 30 women aged 21 - 35 years, divided into control and experimental groups, in which 15 people each were divided by somatotype. The pedagogical experiment was conducted on the basis of the sports club "Fitness Box" in Kyiv. Results. It was found that as a result of the application of the developed shaping program in the women of the experimental group there was a decrease in the fat layer in endomorphs by 13.2%, and in the control group of endomorphs by 7.2% (p < 0,05). Changes in the fat layer in the control and experimental groups are supplemented by changes in girth: chest, shoulder, abdomen, thighs, buttocks, the dynamics of which proves the effectiveness of our program compared to traditional. Conclusions. The application of the developed shaping program allows to solve the problem of improving the efficiency of shaping in order to correct the figure taking into account endomorphic body type of women first adult age.

Derivation of Multiple Assembly Sequences From Exploded Views

1994 ◽  
Author(s):  
Andres Rivero ◽  
Ehud Kroll
Keyword(s):  
Original Method ◽  
Assembly Planning ◽  
Planning Problem ◽  
Assembly Sequences ◽  
Exploded View ◽  
Optimal Assembly ◽  
Multiple Assembly ◽  
Algorithmic Procedure

Abstract The original exploded view method of assembly planning (Mohammad and Kroll, 1993b) attempts to automatically generate the “simplest” assembly plan for a product. Criteria for optimal assembly sequences, however, are sometimes unclear and dependent on specific circumstances. It may therefore be advantageous to present the designer with more than one solution to the assembly planning problem, or allow him or her to select the appropriate criteria. This paper introduces an extension to the original method, where all possible assembly sequences are generated. This completely automatic capability is demonstrated by manually applying the method to a simple example and then comparing the results to those generated by the algorithmic procedure of the C. S. Draper Lab.

The Datum Flow Chain: A Systematic Approach to Assembly Design and Modeling

1998 ◽  
Author(s):  
R. Mantripragada ◽  
D. E. Whitney
Keyword(s):  
Design Process ◽  
Systematic Approach ◽  
Assembly Planning ◽  
Assembly Process ◽  
Top Down ◽  
Assembly Design ◽  
Key Characteristics ◽  
Assembly Sequences

Abstract In order to be able to lay out, analyze, outsource, assemble, and debug complex assemblies, we need ways to capture their fundamental structure in a top-down design process, including the designer’s strategy for kinematically constraining and locating the parts accurately with respect to each other. We describe a concept called the “Datum Flow Chain” to capture this logic. The DFC relates the datum logic explicitly to the product’s key characteristics, assembly sequences, and choice of mating features, and provides the information needed for tolerance analyses. Two types of assemblies are addressed: Type-1 where the assembly process puts parts together at their prefabricated mating features, and Type-2 where the assembly process can incorporate in-process adjustments to redistribute variation. Two types of assembly joints are defined: mates that pass dimensional constraint from part to part, and contacts that merely provide support. The scope of DFC in assembly planning is presented using several examples. Analysis tools to evaluate different DFCs and select the ones of interest are also presented.

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