Assembly-Design-Oriented Semantic Modeling and Assembly Configuration Simulation in Virtual Environment

2015 ◽  
Author(s):  
Xiumin Fan ◽  
Li Tian ◽  
Qichang He ◽  
Keyan Liu
Keyword(s):  
Virtual Assembly ◽  
Prototype System ◽  
Semantic Modeling ◽  
Assembly Design ◽  
Assembly Simulation ◽  
Assembly Features ◽  
Cad Models ◽  
Dynamic Assembly ◽  
Configuration Simulation ◽  
Product Assembly

Usually, virtual assembly simulation is based on fixed assembly relationships between parts which are extracted from product’s CAD models. And virtual assembly systems is mainly used to evaluate product assemblability. In order to enhance the function of virtual assembly system to more assembly-design-oriented, a method of dynamic assembly configuration based on part’s semantic modeling is presented. The part’s semantic model contains assembly features, semantic attributes and physical properties of a part. The uniformed part semantic information is defined based on part’s STEP models and described in XML format. Assembly process simulation for dynamic assembly relationship configuration is realized by semantic reasoning, such as the reasoning to determine mating parts, mating positions, construction/solving/navigation of geometry constraints, and generation and modification of assembly relationships. The method supports the assembly processes simulation from single parts to produce the entire assembly in the virtual environments and works without predefined associations between parts. A prototype system is developed and demonstrated with an excavator. The results show that different assembly configurations for product assembly design can be obtained and the assemblability can be evaluated during the virtual assembly simulation process.

Dynamic assembly simplification for virtual assembly process of complex product

2014 ◽  
Vol 34 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Hong Xiao ◽  
Yuan Li ◽  
Jian-Feng Yu ◽  
Hui Cheng
Keyword(s):  
Growth Process ◽  
Virtual Assembly ◽  
Main Step ◽  
Subgraph Isomorphism ◽  
Assembly Process ◽  
Matching Problem ◽  
Content Type ◽  
Complex Product ◽  
Assembly Features ◽  
Dynamic Assembly

Purpose – Virtual assembly process plays an important role in assembly design of complex product and is typically time- and resource-intensive. This paper aims to investigate a dynamic assembly simplification approach in order to demonstrate and interact with virtual assembly process of complex product in real time. Design/methodology/approach – The proposed approach regards the virtual assembly process of complex product as an incremental growth process of dynamic assembly. During the growth process, the current-assembled-state assembly model is simplified with appearance preserved by detecting and removing its invisible features, and the to-be-assembled components are simplified with assembly features preserved using conjugated subgraphs matching method based on an improved subgraph isomorphism algorithm. Findings – The dynamic assembly simplification approach is applied successfully to reduce the complexity of computer aided design models during the virtual assembly process and it is proved by several cases. Originality/value – A new assembly features definition is proposed based on the notion of “conjugation” to assist the assembly features recognition, which is a main step of the dynamic assembly simplification and has been translated into conjugated subgraphs matching problem. And an improved subgraph isomorphism algorithm is presented to address this problem.

A New Fat-Model for Large-Scale Product Assembly

2012 ◽  
Vol 522 ◽  
pp. 776-782
Author(s):  
Jin Song Bao ◽  
Dian Liang Wu ◽  
Jin Ye
Keyword(s):  
Large Scale ◽  
Virtual Assembly ◽  
Modeling Language ◽  
Assembly Model ◽  
Aircraft Wings ◽  
Assembly Simulation ◽  
Definition Of ◽  
Component Assembly ◽  
Product Assembly ◽  
Digital Prototype

Large-scale component assembly, such as the installation of aircraft wings and ship section etc., is usually high cost, long cycle. Virtual assembly simulation gives the possibility of direct and visual perceive of assembly before the actual assembly using digital prototype. A new virtual assembly model, called VAFM (Virtual Assembly Fat Model), is presented. It integrates not only geometry data, but non-geometry information is embedded. All information of model will evolve, mature and derived gradually, from thin to fat, during the whole assembly process. The paper gives the definition of a VAFM, its framework and the evolution rules of the fat model. Meanwhile the paper design the modeling language based XML. Finally, the visualization of VAFM is also presented..

Object-oriented design of product assembly feature data requirements in advanced assembly planning

2018 ◽  
Vol 38 (1) ◽  
pp. 97-112 ◽  
Author(s):  
Mahmood Reza Khabbazi ◽  
Jan Wikander ◽  
Mauro Onori ◽  
Antonio Maffei
Keyword(s):  
Product Design ◽  
Object Oriented ◽  
3D Models ◽  
Assembly Planning ◽  
Content Type ◽  
Assembly Design ◽  
Assembly Features ◽  
Assembly Feature ◽  
Product Assembly ◽  
Data Requirements

Purpose This paper introduces a schema for the product assembly feature data in an object-oriented and module-based format using Unified Modeling Language (UML). To link production with product design, it is essential to determine at an early stage which entities of product design and development are involved and used at the automated assembly planning and operations. To this end, it is absolutely reasonable to assign meaningful attributes to the parts’ design entities (assembly features) in a systematic and structured way. As such, this approach empowers processes such as motion planning and sequence planning in assembly design. Design/methodology/approach The assembly feature data requirements are studied and definitions are analyzed and redefined. Using object-oriented techniques, the assembly feature data structure and relationships are modeled based on the identified requirements as five UML packages (Part, three-dimensional (3D) models, Mating, Joint and Handling). All geometric and non-geometric design data entities endorsed with assembly design perspective are extracted or assigned from 3D models and realized through the featured entity interface class. The featured entities are then associated (used) with the mating, handling and joints features. The AssemblyFeature interface is realized through mating, handling and joint packages related to the assembly and part classes. Each package contains all relevant classes which further classify the important attributes of the main class. Findings This paper sets out to provide an explanatory approach using object-oriented techniques to model the schema of assembly features association and artifacts at the product design level, all of which are essential in several subsequent and parallel steps of the assembly planning process, as well as assembly feature entity assignments in design improvement cycle. Practical implications The practical implication based on the identified advantages can be classified in three main features: module-based design, comprehensive classification, integration. These features help the automation and solution development processes based on the proposed models much easier and systematic. Originality/value The proposed schema’s comprehensiveness and reliability are verified through comparisons with other works and the advantages are discussed in detail.

Virtual Assembly Simulation Method for Complicated Mechanical Product

2012 ◽  
Vol 532-533 ◽  
pp. 1303-1307 ◽  
Author(s):  
Bo Sun ◽  
Shao Yun Zhang ◽  
Yan Cao
Keyword(s):  
Virtual Assembly ◽  
Simulation Method ◽  
Assembly Process ◽  
Simulation Process ◽  
Car Model ◽  
Mechanical Part ◽  
Assembly Simulation ◽  
Low Efficiency ◽  
Product Assembly

The generation of assembly plans for a new complicated product is often a lengthy and costly manual process. In this paper, the pose description and transformation of mechanical part in virtual assembly space are studied. The assembly simulation idea of “detachable means installable” is discussed. A kind of complicated mechanical product assembly simulation process is proposed. Taking a car model as an example, the application of the assembly simulation process is introduced. In this process, complex and low efficiency computation in the assembly process could be avoided.

Realization and Application Method of Mechanisms Motion Simulation in Virtual Assembly System

2011 ◽  
Author(s):  
Zhixian Zhang ◽  
Jianhua Liu ◽  
Yang Liu
Keyword(s):  
Physical Simulation ◽  
Virtual Assembly ◽  
Assembly System ◽  
Prototype System ◽  
Mechanism Analysis ◽  
Motion Simulation ◽  
Application Range ◽  
Application Method ◽  
Assembly Simulation ◽  
Important Research Topic

In recent years, physical simulation is a new trend of virtual assembly (VA) technology. As a part of physical simulation, mechanisms motion simulation is an important research topic. In order to realize the mechanisms motion simulation in VA system, we presented the realization and application method of mechanisms motion simulation in virtual assembly system combining the prototype system, Virtual Assembly Process Planning (VAPP). We described the bottom framework of VAPP system used for mechanisms motion simulation. Then based on the support of bottom platform, we studied the realization method of mechanisms motion simulation and apply mechanisms motion simulation to virtual assembly simulation via some technologies in VAPP system. Our research shows that, simulating mechanisms motion in VA system not only realizes the visualization of mechanism analysis and simulation, but also improves the ability of analysis of VA system effectively and extends the application range of VA system.

Real-virtual interaction in AR assembly simulation based on component contact handling strategy

2015 ◽  
Vol 35 (4) ◽  
pp. 376-394 ◽  
Author(s):  
X. Wang ◽  
S.K. Ong ◽  
A.Y.C. Nee
Keyword(s):  
Information Management ◽  
Management Approach ◽  
Prototype System ◽  
Original Design ◽  
Content Type ◽  
The Real ◽  
Assembly Design ◽  
Assembly Simulation ◽  
Simulation Based ◽  
Virtual Interaction

Purpose – This paper aims to propose and implement an integrated augmented-reality (AR)-aided assembly environment to incorporate the interaction between real and virtual components, so that users can obtain a more immersive experience of the assembly simulation in real time and achieve better assembly design. Design/methodology/approach – A component contact handling strategy is proposed to model all the possible movements of virtual components when they interact with real components. A novel assembly information management approach is proposed to access and modify the information instances dynamically corresponding to user manipulation. To support the interaction between real and virtual components, a hybrid marker-less tracking method is implemented. Findings – A prototype system has been developed, and a case study of an automobile alternator assembly is presented. A set of tests is implemented to validate the feasibility, efficiency, accuracy and intuitiveness of the system. Research limitations/implications – The prototype system allows the users to manipulate and assemble the designed virtual components to the real components, so that the users can check for possible design errors and modify the original design in the context of their final use and in the real-world scale. Originality/value – This paper proposes an integrated AR simulation and planning platform based on hybrid-tracking and ontology-based assembly information management. Component contact handling strategy based on collision detection and assembly feature surfaces mating reasoning is proposed to solve component degree of freedom.

Design and Development of Virtual Assembly Prototype System for CLEAR-I

2014 ◽  
Author(s):  
Leiming Shang ◽  
Zihui Yang ◽  
Jinbo Zhao ◽  
Tao He ◽  
Liqin Hu
Keyword(s):  
Virtual Assembly ◽  
Prototype System ◽  
Scene Modeling ◽  
Virtual Reality Technology ◽  
Assembly Simulation ◽  
Key Points ◽  
Chinese Academy Of Sciences ◽  
Academy Of Sciences ◽  
Preliminary Application ◽  
Subcritical System

China LEAd-based research Reactor (CLEAR-I), which is one part of Accelerator Driven subcritical System (ADS) proposed by Chinese Academy of Sciences. Assembly scenario simulation is part of the CLEAR-I R&D project, enabling their suitability for the environment or scenario key points to be verified, taking into account unexpected situations and providing technical answers. Based on virtual reality technology, a virtual assembly prototype system for CLEAR-I has been developed for training, ergonomics evaluation, safety and security purposes. Main capabilities of system include: 1) CAD-based virtual scene modeling; 2) immersive experience in virtual environment; 3) interactive virtual assembly simulation of complex components. The paper describes the system architecture, main methods and its preliminary application to CLEAR-I.

A Novel Haptic Rendering Algorithm for Stable and Precise 6-DOF Virtual Assembly

2010 ◽  
Author(s):  
Muli Liu ◽  
Dangxiao Wang ◽  
Yuru Zhang
Keyword(s):  
Virtual Assembly ◽  
Haptic Rendering ◽  
Mechanical Assembly ◽  
Constant Frequency ◽  
Refresh Rate ◽  
Assembly Features ◽  
Cad Models ◽  
Continuous Feedback ◽  
The Common ◽  
Six Degree Of Freedom

This paper presents a novel algorithm for six-degree-of-freedom (6-DOF) haptic rendering, providing a fast, stable and precise virtual assembly. This algorithm simplifies large and complex CAD models into simple geometric primes, to accelerate the collision detection and therefore the refresh rate. Analytic approach is employed to simulate the virtual assembly. The common assembly process is decomposed into two basic types of manipulations, axis-alignment assembly and face-mating assembly. Some special assembly features (thread, spline and gear, etc) are described in special parameters. The algorithm has been implemented and interfaced with a 6-DOF PHANToM Premium 3.0. We demonstrate its performance on force display of the mechanical assembly. The object with low clearances can be assembled, and the continuous feedback force can be guaranteed at a constant frequency of 1 kHz.

Automated Navigation of Method Time Measurement Tables for Automotive Assembly Line Planning

2013 ◽  
Author(s):  
Rahul Renu ◽  
Matthew Peterson ◽  
Gregory Mocko ◽  
Joshua Summers
Keyword(s):  
Software Tool ◽  
Controlled Vocabulary ◽  
Prototype System ◽  
Assembly Process ◽  
Line Planning ◽  
Assembly Time ◽  
Study Results ◽  
Automotive Assembly ◽  
Cad Models ◽  
Assembly Procedure

Assembly process sheets are formal documents used extensively within automotive original equipment manufacturers (OEMs) to document and communicate assembly procedure, required tooling, contingency plans, and time study results. These sheets are authored throughout the vehicle life-cycle. Further, various customers use these sheets for training, analyzing the process, and line-balancing. In this research, the primary focus is the time studies analysis that is completed using knowledge contained within the assembly process sheets. In this research, a method and software tool are developed to utilize coupling between part descriptions and process descriptions for assembly time studies. The method is realized through the development of a standardized vocabulary for describing work instructions, a mapping from work instructions to MTM codes, and a tool for extracting relevant part information from CAD models. The approach enables process planners to establish part-process coupling, author work instructions using the controlled vocabulary, to estimate assembly time. A prototype system is developed and tested using examples from an automotive OEM.

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