Model Based Definition Technology Research Articles

Research on intelligent decision method of computer-aided manufacturing numerical control parameters based on model-based definition and back propagation neural networks

Aiming at the low efficiency and intelligence degree in the parameter setting of computer-aided manufacturing (CAM) numerical control (NC) programming caused by manual work, an intelligent decision-making method of CAM NC programming parameters based on model-based definition (MBD) is proposed. The hierarchical process model uses MBD technology to express the process flow and manage the process information. The tightness between process and NC machining is enhanced by sorting out NC machining steps and extracting their process information automatically. Then a back propagation (BP) neural network is used to mine the experience of NC programming in historical cases. Sparrow search algorithm (SSA) and other methods are used to optimize BP neural network’s initial weight and threshold, learning rate, and feedback process. A CAM parameter decision model based on BP neural network is constructed. Taking the connecting rod of a certain type of diesel engine as the experimental object, the method increases programming efficiency by 47%, with an accuracy rate of 80%. It is proved that the intelligent decision-making method proposed in this paper has practicability and feasibility.

Research and Application of Spacecraft Pipeline Digital Development Mode Based on MBD Technology

With the increasingly complex types, functions and structures of spacecraft, the requirements for the quality and cycle of spacecraft pipeline design are becoming higher and higher. By summarizing and analyzing the shortcomings of the traditional development mode of relying on drawings and documents as the carrier, and fully combining with the advanced technology of Model-Based Definition (MBD), the digital development mode of spacecraft pipeline based on MBD technology is proposed. Through the built-in pipeline design rules, the construction of standard parts database and CNC elbow, etc., and relying on the Virtual Product Management (VPM) management platform, with a set of pipeline digital model as the information carrier, runs through the design, process and welding work, shorten the spacecraft pipeline development cycle, improves the design quality, and significantly improves the quality control level.

Implementation of model-based definition and product data management for the optimization of industrial collaboration and productivity

For many years, it has been the industry’s intention to support its product life-cycle with different data formats and versions of the same model in order to provide the necessary information for all the downstream processes. The creation of Model-Based Definition technology eliminates the necessity of diverse file formats by substituting them with a single file that is capable of carrying all the important information for processes, such as design, manufacturing, etc. Furthermore, to achieve a proper distribution of the data to the departments involved in the development of the product, many approaches exploited the PLM and the model-based workflows emerged from these technologies’ cooperation. The purpose of this paper is to introduce a proposed methodology, which utilizes the capabilities of MBD technology along with the use of PDM software to refine the data sharing process and streamline the collaboration among different departments of a company, without being limited to the design and manufacturing of the product. Aiming to eliminate counterproductive data formats and collaboration methods used in the industry, the proposed method uses an MBD 3D PDF-based template as the main source of the necessary information for all the product life-cycle processes. This lightweight template file, in cooperation with the PDM software, provides the ability to all the departments to obtain the required information, and contribute to the generation of them through a proposed workflow. Moreover, the results concerning the duration of different production activities obtained by the implementation of the method to an industrial equipment company, are used to demonstrate its efficiency.

Research on the intelligent generation method of MBD model 3D marking using predefined features

Model-based definition (MBD) carries out a technological innovation for global manufacturing, application of MBD technology plays an important supporting in process design, product manufacturing and other development activities, rapid creation of MBD models have become a key to reduce time and cost for enterprises. However, interactive dimensioning method has severely hampered the efficiency of MBD model creation. This paper mainly studies the dimensions intelligent marking method based on the predefined features to solve the rapid modeling problem of MBD model. Firstly, the expression model of dimensions metadata is established based on the feature identifier. Secondly, by establishing an association mechanism between the dimensions and the predefined feature, the “model-feature-dimensioning” association model is formed. Thirdly, through analysis of the dimensioning type, the intelligent dimensioning algorithm process is determined. Moreover, the completeness check of the dimensions is guaranteed during the marking process. Finally, taking the connecting rod and crankshaft of marine diesel as the research object, the effectiveness of this method is verified.

Model-based definition capabilities and its impact on industrial productivity

The need for optimization of the product manufacturing cycle and data management resulted in the creation of the model-based definition technology. The beneficial impact in most processes (CAD, CAE, CAPP, CAM, etc.) of a product manufacturing cycle, made the MBD technology implemented in various industries. The following paper has the purpose of highlighting the benefits and limitations of the current MBD capabilities and makes its impact on the industrial collaboration known by summarizing the communication file formats, which support this technology. Special interest is attributed to lightweight collaboration files, especially 3D PDFs, which are capable to deliver information and data to the domains of a company inside or outside of the manufacturing cycle and support all the necessary downstream activities of the product.

Research on the Three-Dimensional Process Design Method of Shipbuilding Based on MBD Technology

From two-dimensional engineering drawings, Computer-aided Design (CAD) technology to today’s three-dimensional process design technology of Model Based Definition (MBD) based on feature representation and control, great changes have taken place in human engineering technology. With the applications of MBD technology in aerospace, machine-tool and other fields, it’s also being actively explored in shipbuilding industry on engineering applications of the whole process of ship design and production under the background of intelligent transformation. After analysing the problems existed in process design of domestic shipbuilding enterprises, this paper firstly introduces a three-dimensional digital model of shipbuilding based on MBD technology. Then, a three-dimensional process design method is proposed in order to provide theoretical basis for the realization of three-dimensional process design of shipbuilding.

Research on three-dimensional digital process planning based on MBD

PurposeThree-dimensional digital design and manufacturing technology are changing the current manufacturing pattern and have become the core of enterprise competition. However, the research and application of three-dimensional digital technology in the present phase have a strong bias toward the design of three-dimensional model and focus little on process planning. It restricts the development of manufacturing industry. Therefore, this paper aims to present a design scheme of three-dimensional digital process planning.Design/methodology/approachA three-dimensional digital process design method is developed by combining model-based definition technology and knowledge engineering technology. Model-based definition technology is used to display the process information. And knowledge engineering technology is used for process decision; meanwhile, ontology technology is introduced to describe process knowledge. And taking shaft part as an example, this paper establishes the general ontology of manufacturing process and the special ontology of shaft. This research provides an available method for the three-dimensional digital process planning.FindingsTraditional process planning mainly is based on two-dimensional engineering drawing, which leads to the low efficiency and quality of process planning. Moreover, it cannot achieve effective mining and management of knowledge. Thus, applying an effective knowledge management technology into a three-dimensional process system is necessary.Research limitations/implicationsThis paper contributes to an available method for three-dimensional digital process planning.Originality/valueThe introduction of model-based definition technology makes process information display in three-dimensional environment. And ontology technology achieves sematic reference and efficient management of process knowledge.

A Publishing Method of Lightweight Three-Dimensional Assembly Instruction for Complex Products

In order to accurately guide on-site workers to quickly accomplish the assembly job of complex products, and reduce the deployment cost of assembly instruction, we propose a publishing method of lightweight 3D assembly instruction for complex products. In this paper, the key frames of assembly motion and the 3D technical annotations in the lightweight model are mapped to the time-based assembly process. Then, the annotated lightweight model and assembly process information are integrated and published into a single 3D assembly instruction document. An assembly instruction publishing example of satellite antenna feed component shows that the lightweight 3D assembly instruction is well instructive and affordable because it provides the interactive simulation of assembly process and time-based display of assembly technical annotations without using expensive computer-aided design (CAD) systems, graphics workstations, or virtual reality equipments. This method gives a full play to the advantages of model-based definition technology and lightweight model, and fills the gap between the process planning and the instruction publishing in the 3D virtual manufacturing environment.

Digital Three-Dimensional Labeling System of Product Design Information Based on MBD

MBD (Model Based Definition) technology is the development trend of digital design and manufacture. Design information includes geometric elements, annotations and process attributes. In the paper, the focus is concentrated on digital three-dimensional (3D) labeling of annotations. The 3D labeling system of product design information is seamlessly integrated with NX platform to define digital information of a 3D product model. The Key technologies of the 3D labeling system realization on NX platform mainly includes transformation of space coordinates, reference plane construction based on solid modeling and 3D dimensioning. NX internal program mode is adopted where the developed program is compiled and linked to generate the dll file whose codes are small and whose connection speed is fast. Integrated digital definition of a 3D model shortens product development cycle and improves product design and manufacturing efficiency.

New methods of creating MBD process model: On the basis of machining knowledge

Traditional machining process planning, which passes manufacturing information through 2D drawing, fails to meet the requirement of current 3D manufacturing environment. Thus, model based definition technology, which uses 3D technology to upgrade the current manufacturing capacity, comes into being. This paper focuses on the creation methods of 3D machining process model. In the first place, the relation between machining knowledge and 3D modeling knowledge has been analyzed, establishing machining ontology and modeling ontology. Then, forward creation method and reversed creation method of machining-knowledge-based 3D process model are proposed. In forward creation method, to drive 3D modeling with machining knowledge, process model is created in commercial CAD platform with modeling ontology transferred from machining ontology for knowledge reasoning through the decision tree constructed from training set and test set. Reversed creation method is established by identifying and suppressing the volumetric machining features and surface machining features after building attributed adjacent graph of process model, and the machining knowledge contained in 3D process model is extracted for subsequent reuse. Finally, the validity of this method is verified with the proposed prototype system.

Three-Dimensional Process Design of Large Complex Mechanical Product

With the Model Based Definition technology applied in the aviation manufacturing industry, the 3D model becomes the only basis to design and manufacture. The 3D manufacturing process design becomes the link between three-dimensional design and three-dimensional manufacturing. Here, the relations are analyzed between the traditional manufacturing model and three-dimensional manufacturing model, and the key technology and method of 3D manufacturing process design are made clear. Furthermore, three-dimensional process system architecture is proposed combining the enterprise application integration and data management requirements. Finally, a practice result of enterprise information project mentioned as an example, which would be the foundation to establish the complete three-dimensional development system.

Information Extension of Three-Dimensional Model for Coordinate Measurement

The process of coordinate measurement involves a large amount of data. This paper uses the IDEF0 and DFD model to analyze the measuring function requirements for solving the problem of ambiguous internal information flow and material flow during the measuring process and uses IDEF1X method to constitute information model of coordinate measurement. The information is extended on the three-dimensional model generated by using the MBD (model based definition) technology. It enables us to specify the measurement process and reduce the specification uncertainty of the digital measuring system. In addition, the extended information could have been inputted for the subsequent process such as process planning, data analysis and evaluation of measurement results.

Machining Process Knowledge Discovery Technology: On the Basis of MBD Process Model

To tackle process knowledge discovery difficulty in machining process, this paper studies knowledge discovery method of 2.5–dimensional machining characteristics based on process model with model based definition technology, and finds out machining process design knowledge with the natural structured process description ability of MBD process model. Firstly, the composition of machining geometry ontology and process ontology is analyzed. Secondly, decision tree between ontology are obtained by analyzing abundant samples of MBD process model. Thus, the process and method of reasoning from geometry ontology to process ontology is achieved. Finally, the validity of process knowledge discovery method is exemplified with a group of MBD process models.

Unified Product Information Modeling Using Model-Based Definition Technology

It is a common phenomenon that 3D model and 2D engineering drawings are widely used together in modern manufacturing scenario. Therefore it makes a lot of extra tasks to do for both of them which lead to such results as high time consuming, labor intensive during the process. The Model-based Definition (MBD) approach is definitely an effective method to solve above problems. To facility the usage of the MBD Technology, this paper introduces two kinds of MBD model (design-MBD, process-MBD), and describes their contents as well. The paper also focuses on constructing the dMBD model and pMBD model from two aspects: information organization and annotation standard so that these models can guide production more effective.

Challenge of Model Based Definition Technology to Engineering Graphics Education

MBD (Model Based Definition) technology is a digital method of product definition which combines all information required for manufacturing into the 3D design model including annotation, processing description, attributes and management information. This advancement is a not only a change in media used in the design, manufacturing, inspection and management cycles of the product but also a disruptive reform in engineering-thinking. MBD technology defines a product completely without traditional engineering drawing which is challenging the engineering graphics education. Though MBD technology has not been fully tested or fully developed in all field, change and revolution in relative engineering education must be taken into consideration simultaneously. By comparing the traditional 2D and 3D representation methods with the MBD technology including geometric and non-geometric information of product, some suggestions are presented in contemporary engineering graphics education.