The Experts below are selected from a list of 5118 Experts worldwide ranked by ideXlab platform
Terrence Fernando - One of the best experts on this subject based on the ideXlab platform.
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an immersive Assembly and maintenance simulation environment
IEEE international symposium on Distributed Simulation and Real-Time Applications, 2004Co-Authors: Norman Murray, Terrence FernandoAbstract:This paper outlines the development of a virtual environment for Constraint based Assembly and maintenance task simulation and analysis of large scale mechanical products. It is important that allowance is made for maintenance activities during a products design phase to help reduce the lifetime operating costs of such large scale mechanical products. Unfortunately, current CAE systems do not support such assessment capabilities, with these issues typically being addressed using expensive and time consuming physical prototypes. The design and implementation of an immersive virtual prototyping environment for supporting the assessment of assemblability and maintainability of large scale mechanical products, along with its use as a maintenance training tool will be outlined. Procedures and environments for realistic component Assembly, Constraint recognition, automatic disAssembly sequence generation, and maintenance review and training are presented. The simulation of maintenance operations allows for maintenance to be addressed early in the design stages. This reduces unforeseen problems creeping into the design as it progresses through its life cycle, consequently saving both time and money while improving product quality.
Xun Xu - One of the best experts on this subject based on the ideXlab platform.
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relationship matrix based automatic Assembly sequence generation from a cad model
Computer-aided Design, 2013Co-Authors: Liming Ou, Xun XuAbstract:Currently in industry, design and communication of a product Assembly is through the use of computer-aided design (CAD) systems. However, there are no commercial systems that can automatically generate feasible Assembly sequence plans. There is past and current academic research in methods to provide automatic Assembly sequence planning. Assembly sequence planning using a commercial system often relies on an expert Assembly sequence planner, and it is predominantly done manually. This requires a great amount of time and expert knowledge; Assembly sequence plans generated may not even be the most efficient. The ability to automatically generate Assembly sequence plans will lead to the reduction of planning time, less reliance on the amount of knowledge required, and better plans at earlier stages of the design process. CAD models are based on feature Constraints to create and define an Assembly. The challenges to automatically generate Assembly sequences using CAD models lie in intelligent reasoning and analysis of the modelled Assembly data. Based on past research findings, there is a reason to believe that Assembly Constraints used in CAD Assembly models can provide essential information related to the Assembly process. This paper presents a system that can analyse and utilize Assembly data available from a CAD model to generate Assembly sequences. The system also considers a user input as a type of Assembly Constraint. The system is capable of producing a set of ranked feasible Assembly sequence plans for an operator to evaluate. A matrix approach has been adopted to process the information retained from a CAD model. Interference and stability studies are carried out during the creation of Assembly sequence plans. The outputs are ranked based on the ease of Assembly and the stability of the generated Assembly sequence plans. Case studies are used to evaluate the system and the feasibility of the output. A case study using a two stroke engine is presented, which demonstrates how the system generates Assembly sequence plans.
Cad Support - One of the best experts on this subject based on the ideXlab platform.
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Research on 3D Assembly Constraint Solving with Approximate Update Formula of Jacobian Matrix
2014Co-Authors: Cad SupportAbstract:A new method of approximately updating Jacobian matrix during 3D Assembly Constraint solving is proposed in this paper.This method principally improves the efficiency of Constraints solving based on the approximate update of Jacobian matrix.First,an approximate update formula of Jacobian matrix and its inverse matrix are inserted to the non-linear iterative solution process.After that,the indispensable Constraint is put forward,which must be satisfied when using the formulas above.At last,a solution handling row rank defect of Jacobian matrix is introduced via disturbance algorithm description.The methodology presented is implemented in a 3D Assembly Constraint solving engine,named CBABench.An example given at the end of this paper shows that the method has achieved a considerable effect.
Junyan Liu - One of the best experts on this subject based on the ideXlab platform.
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a pragmatic system to support interactive Assembly planning and training in an immersive virtual environment i vapts
The International Journal of Advanced Manufacturing Technology, 2006Co-Authors: Yongzhen Yao, Ping Jun Xia, Junyan LiuAbstract:Assembly planning for complex products is a difficult task requiring both intensive knowledge and experience. Computer aided Assembly planning (CAAP) systems have been the subject of considerable research in recent years without achieving a wide application in manufacturing industry. In this paper an alternative approach to the generation of an optimal Assembly planning scheme is presented based on the adoption of immersive virtual reality. A product is assembled from CAD models by providing a CAD interface to transfer Assembly Constraint information from the CAD system to a virtual environment. In the virtual environment an efficient dynamic recognition and management method based on surface geometry is employed, and a process-oriented Assembly task model is established to support interactive Assembly planning and evaluation. The system is implemented using an object oriented methodology, and has been successfully applied to train and guide the Assembly workers in a pump Assembly process.
Norman Murray - One of the best experts on this subject based on the ideXlab platform.
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an immersive Assembly and maintenance simulation environment
IEEE international symposium on Distributed Simulation and Real-Time Applications, 2004Co-Authors: Norman Murray, Terrence FernandoAbstract:This paper outlines the development of a virtual environment for Constraint based Assembly and maintenance task simulation and analysis of large scale mechanical products. It is important that allowance is made for maintenance activities during a products design phase to help reduce the lifetime operating costs of such large scale mechanical products. Unfortunately, current CAE systems do not support such assessment capabilities, with these issues typically being addressed using expensive and time consuming physical prototypes. The design and implementation of an immersive virtual prototyping environment for supporting the assessment of assemblability and maintainability of large scale mechanical products, along with its use as a maintenance training tool will be outlined. Procedures and environments for realistic component Assembly, Constraint recognition, automatic disAssembly sequence generation, and maintenance review and training are presented. The simulation of maintenance operations allows for maintenance to be addressed early in the design stages. This reduces unforeseen problems creeping into the design as it progresses through its life cycle, consequently saving both time and money while improving product quality.
