Automatic High-Fidelity 3D Road Network Modeling

Many computer applications such as racing games and driving simulations frequently make use of 3D high-fidelity road network models for a variety of purposes. However, there are very few existing methods for automatic generation of 3D realistic road networks, especially for those in the real world. On the other hand, vast road network GIS data have been collected in the past and used by a wide range of applications, such as navigation and evaluation. A method that can automatically produce 3D high-fidelity road network models from 2D real road GIS data will significantly reduce both the labor and time needed to generate these models, and greatly benefit numerous applications involving road networks. Based on a set of selected civil engineering rules for road design, this dissertation research addresses this problem with a novel approach which transforms existing road GIS data that contain only 2D road centerline information into 3D road network models. The proposed method consists of several components, mainly including road GIS data preprocessing, 3D centerline modeling and 3D geometry modeling. During road data preprocessing, topology of the road network is extracted from raw road data as a graph composed of road nodes and road links; road link information is simplified and classified. In the 3D centerline modeling part, the missing height information of the road centerline is inferred based on 2D road GIS data, intersections are extracted from road nodes and the whole road network is represented as road intersections and road segments in parametric forms. Finally, the 3D road centerline models are converted into various 3D road geometry models consisting of triangles and textures in the 3D geometry modeling phase. With this approach, basic road elements such as road segments, road intersections and traffic interchanges are generated automatically to compose sophisticated road networks. Results show that this approach provides a rapid and efficient 3D road modeling method for applications that have stringent requirements on high-fidelity road models

Production of gears model on FDM printer

Tato bakalářská práce se zabývá problematikou 3D tisku ozubeného soukolí. V první části jsou stručně shrnuty procesy 3D tisku, vybrané druhy Rapid Prototyping s ohledem na metodu FDM a vlastnosti materiálů používaných při této metodě. Druhá část práce se zabývá návrhem modelu ozubeného soukolí, vycházející z převodovky kuchyňského mixéru. Převodovka byla navržena v 3D modelovacím programu Autocad inventor 2013 a vytištěna na Reprap tiskárně Sinuhed. Na závěr je uvedeno technicko-ekonomické zhodnocení výroby modelu.This bachelor thesis deals with an issue of 3D printing of gears. In the first part are concisely summarized processes of 3D printing, selected types of Rapid Prototyping considering the FDM and properties of materials used in this method. The second part deals with a suggestion of gears model based on the gearbox of the kitchen blender. Gearbox was designed in 3D modeling program Autocad inventor 2013 and printed on the Reprap printer Sinuhed. There is techno-economic appreciation of production of the model in conclusion.

Additive manufacturing of cellular materials with tailored properties

The ability to pattern complex materials with high-speed and low-cost three-dimensional (3D) printing techniques is highly desirable. Here, we present progress on developing siloxane-based feedstock formulations, known as “inks,” for a unique 3D printing approach called Direct Ink Writing (DIW). DIW is a low-cost, mask-less printing route that enables rapid design and patterning of planar and three-dimensional (3D) microstructures. In this filamentary printing approach, a concentrated ink with tailored viscoelastic properties is deposited through a micro-nozzle that is translated using a multi-axis positioning stage. The ink rapidly solidifies as it is extruded so that 3D structures with fine features may be built up in a layer-by-layer fashion. We introduce the concept of tailoring the macro-scale mechanical properties by designing the 3D micro-architecture of the printed cellular silicone materials. We show the ability to obtain highly uniform or graded properties by simply adjusting the pattern design. Moreover, by understanding the materials-structure-processing property relationships, we have created a modeling-design-fabrication approach to achieve tailored mechanical properties. For example, we have created porous architectures that, in one case, are well suited for pure compression and, in a separate case, are better suited for shear environments. We expect that the ability to deterministically program mechanical performance from part-to-part and within a part will prove useful for many applications

Production of handbrake component of the car using the rapid prototyping technology

Bakalářská práce je zaměřena zejména na výrobu komponentu ruční brzdy pro automobil Fiat Stillo pomocí technologie Rapid Prototyping metodou FDM. Úvodní část práce obsahuje stručný popis technologií Rapid Prototyping. Součástí práce je modelování komponentu ruční brzdy reálné součásti ve vozidle, u které došlo k destrukci úchytných částí a úprava modelu pro výrobu. Výroba komponentu je realizována na 3D tiskárnu uPrint využitím metody Fused Deposition Modeling. Závěrečná část práce obsahuje zhodnocení nákladů na výrobu komponentu a cenou komponentu dostupného v maloobchodní síti.Bachelor thesis is mainly focused on manufacturing of hand brake component for Fiat Stillo using method Fused Deposition Modeling. Introduction part contains a brief description of Rapid Prototyping technology. Practical part of the work is based on modeling of real component of handbrake, whose fastener part has been damaged. In the work is also description of the necessary modifications for the production of model by FDM method. Production of the component has been performed on Dimension uPrint FDM printer. The final part contains an assessment of production costs compared to price of the product in retail stores.

Volume Modeling for Rapid Prototyping

The expanding workspace of Rapid Prototyping will draw on the new developments in geometric modeling. Volume modeling has substantial advantages over other modeling schemes to meet the emerging requirements of Rapid Prototyping technology. It provides us with a new approach to design complex geometry and topology. The integration of the volume modeling and Rapid Prototyping technology will help us to fully exploit RP's ability to fabricate objects with complex structures. This paper addresses our research and practice in a volume modeling system toward Rapid Prototyping. Novel techniques in volumetric data manipulation, NURBS volume models and triangular facet generation over solid models are presented. Computer models designed by this system and their corresponding DTM products are also shown atthe end of this paper.Mechanical Engineerin

Geometric Modeling of Cellular Materials for Additive Manufacturing in Biomedical Field: A Review

Advances in additive manufacturing technologies facilitate the fabrication of cellular materials that have tailored functional characteristics. The application of solid freeform fabrication techniques is especially exploited in designing scaffolds for tissue engineering. In this review, firstly, a classification of cellular materials from a geometric point of view is proposed; then, the main approaches on geometric modeling of cellular materials are discussed. Finally, an investigation on porous scaffolds fabricated by additive manufacturing technologies is pointed out. Perspectives in geometric modeling of scaffolds for tissue engineering are also proposed

Hybrid Prototypes to Assist Modeling Automotive Seats

The development of new modular seats is an important issue in the automotive industry. However, is very time consuming and costly. Virtual models and hybrid prototypes could accelerate the car seats development process. The hybrid prototypes are mainly manufactured by rapid prototyping with multi materials. The objective of this paper is to establish a methodology to develop innovative lightweight multi-functional, modular car seats to be used in Multi-Purpose Vehicles (MPV), by means of FEA simulation and rapid prototyping additive/subtractive technologies utilizing multi materials. A case study is presented to validate the developed methodology. The manufactured hybrid prototype’s reproduces the main functionalities of the MPV modular seat, namely its three key positions: normal, stored and table.Mechanical Engineerin

From 3D Models to 3D Prints: an Overview of the Processing Pipeline

Due to the wide diffusion of 3D printing technologies, geometric algorithms for Additive Manufacturing are being invented at an impressive speed. Each single step, in particular along the Process Planning pipeline, can now count on dozens of methods that prepare the 3D model for fabrication, while analysing and optimizing geometry and machine instructions for various objectives. This report provides a classification of this huge state of the art, and elicits the relation between each single algorithm and a list of desirable objectives during Process Planning. The objectives themselves are listed and discussed, along with possible needs for tradeoffs. Additive Manufacturing technologies are broadly categorized to explicitly relate classes of devices and supported features. Finally, this report offers an analysis of the state of the art while discussing open and challenging problems from both an academic and an industrial perspective.Comment: European Union (EU); Horizon 2020; H2020-FoF-2015; RIA - Research and Innovation action; Grant agreement N. 68044

Application of modern technologies for the production of spare parts airsoft guns

Tato bakalářská práce popisuje konstrukci a výrobu náhradních součástí do airsoftové zbraně. Vybranými náhradními součástmi byly kohout a držák pružiny, které byly zkonstruovány ve 3D parametrickém programu Autodesk Inventor 2016. Pro výrobu součástí bylo využito metody Fused Deposition Modeling, patřící do technologie Rapid Prototyping. Součásti byly vyrobeny na 3D tiskárně uPrint. Na základě vytvořené součásti držák pružiny byla vytvořena silikonová forma, která sloužila pro výrobu plastové součásti odléváním. Práce je zakončena technicko-ekonomickým zhodnocením, ve kterém bylo zjištěno, že odlévání do silikonové formy je výhodnější při výrobě více kusů.This bachelor thesis describes design and manufacture of airsoft spare parts. Selected spare parts were hammer and spring holder, which were designed in 3D parametric software Autodesk Inventor 2016. Chosen method to manufacture spare parts, was Fused Modeling Deposition, which is part of Rapid Prototyping technology. The device for producing parts was 3D printer uPrint. The manufacture of silicon mould was based on printed spring holder, which was used for parts manufacture, by casting plastic materiál. Thesis is completed with a technical-economical evaluation, in which it was found that the silicon mould casting is more profitable in the production of more parts.