Landscape Perspective Distance-Included Angle Shape Distribution Analysis Based on 3D CAD Model Retrieval Algorithm

In view of the results obtained in the retrieval process of the 3D CAD model, which can show the differences in the local feature details of the model, the 3D CAD model retrieval algorithm is introduced into the analysis of the perspective distance-angle shape distribution of the garden landscape in this paper. Random sampling is performed on the surface of the constructed 3D CAD model, combined with the test distance between the sampling point and the neighboring points, and the corresponding garden landscape perspective distance-angle shape distribution characteristics in this area are calculated in order to achieve the similarity of the CAD model high-speed retrieval. Finally, experimental research shows that the algorithm proposed in this paper is better than the overall shape distribution algorithm and the spherical harmonic algorithm in the search performance of the CAD model, and it can effectively improve the recognition ability of the local detailed features of the 3D CAD model.

User Generated Content for Site Based Training in Virtual Reality

Objectives/Scope Through a partnership with Global Projects and the ExxonMobil IT, we set out to change the way enabling enhanced site specific operator training and model reviews are done on large complex models. The concept was to have the ability to view and navigate complex green-field 3D CAD models in VR (virtual reality) technology to aid in training, model reviews, procedure development, rounds development, maintenance planning and execution, emergency response planning / drills, and project planning. The automated toolset can be used to conduct model reviews followed by training and preparing operators for commissioning before and after site construction is completed. Methods, Procedures, Process Leveraging the 3D CAD files from Engineering Procurement & Construction (EPC) contractors, the feature set allows the ability to create a fully textured 3D Model walk-through (annotated model review), and a content creation application to easily create user generated training scenarios (similar to PowerPoint drag and drop). In the past few months, 20 onsite stations were setup and over 100 first and second line supervisors and operators leveraged the toolset. Baseline metrics were captured with an overwhelming success. Ongoing metrics collections will continue for several months to drive further adjustments on the toolset to ensure high value capture. This toolset, once fully refined, will allow other capital & global projects the ability to train operators prior to the unit being built and ongoing for operations activities bringing pieces of the Digital Twin concept to life. Results, Observations, Conclusions Technical Benefits Business Benefit Novel/Additive Information

Evaluation of the vertical strenght of a 3000 tdw barge using the equivalent beam approach

For the preliminary design stage, the evaluation of vertical strength is mandatory for the preliminary scantling of the structure. This paper presents the evaluation of the vertical sectional efforts by equivalent beam approach, using the 3D-CAD lines plan of a 3000 tdw barge and mass diagram. For numerical analysis the own program P_QSW is used, for sagging and hogging wave condition, ship headings 0 and 45o, wave height max. 1.2 m. The vertical sectional efforts are compared with the maximum bending moment and shearing force prescribed by the classification societies for the 3000 tdw preliminary vertical strength assessment.

Application of Computer Aided 3D CAD Technology in Mechanical Manufacturing and Automation

With the development of computer-aided technology, the application of computer-aided 3D CAD technology in mechanical manufacturing has become more and more extensive. And it has brought new breakthroughs to the machinery manufacturing industry. This article analyzes the characteristics and functions of 3D CAD technology and its application in mechanical manufacturing design, and it also analyzes the characteristics of mechanical automation control systems. In addition, this article also conducts research on the design of mechanical automation control system.

An Approach to the Study of a 19th-Century Sugarcane Mill and Steam Engine through CAD Techniques and Mechanical Engineering

This article shows an approach to the three-dimensional modelling of a sugarcane mill and its associated steam engine, designed by the Robey and Co. engineering company in 1869. In order to obtain the 3D CAD model of said invention, CATIA V5 R20 software has been employed. Various sources of starting material, from the basis of this research and found in the process of searching for relevant information, provide information on the main elements, operating conditions, and mechanism of the machine. Thanks to the three-dimensional geometric modelling carried out, it has been possible to explain, in detail, both its operation and the final assembly of the invention through the assemblies of its different subsets, thereby obtaining a virtual recreation that shows its operation. Likewise, a study has been carried out, from a mechanical engineering viewpoint, of the gear train that transmitted the movement, in order to ascertain the compression force exerted on the sugar cane. This research, related to industrial archaeology, therefore, enables the reader to understand a machine that constituted a milestone in the sugarcane industry, while paying tribute to the English engineer, Robert Robey.

Discovery of key function module in complex mechanical 3D CAD assembly model for design reuse

Purpose Complex mechanical 3D computer-aided design (CAD) model embodies rich implicit design knowledge. Through discovering the key function parts and key function module in 3D CAD assembly model in advance, it can promote the designers’ understanding and reuse efficiency of 3D assembly model in design reuse. Design/methodology/approach An approach for discovering key function module in complex mechanical 3D CAD assembly model is proposed. First, assembly network for 3D CAD assembly model is constructed, where the topology structure characteristics of 3D assembly model are analyzed based on complex network centrality. The degree centrality, closeness centrality, betweenness centrality and mutual information of node are used to evaluate the importance of the parts in 3D assembly model. Then, a multi-attribute decision model for part-node importance is established, and the comprehensive evaluation for key function parts in 3D assembly model is accomplished by combining Analytic Hierarchy Process and Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS). Subsequently, a community discovery of function module in assembly model-based Clauset–Newman–Moore (CNM)-Centrality is given in details. Finally, 3D CAD assembly model of worm gear reducer is taken as an example to verify the effectiveness and feasibility of proposed method. Findings The key function part in CAD assembly model is evaluated comprehensively considering assembly topology more objectively. In addition, the key function module containing key function part is discovered from CAD assembly model by using CNM-Centrality-based community discovery. Practical implications The approach can be used for discovering important design knowledge from complex CAD assembly model when reusing the assembly model. It can help designers capture and understand the design thinking and intent, improve the reuse efficiency and quality. Originality/value The paper first proposes an approach for discovering key function module in complex mechanical 3D CAD assembly model taking advantage of complex network theory, where the key function part is evaluated using node centrality and TOPSIS, and the key function module is identified based on community discovery.