Nikola Vukašinović

Nikola Vukašinović
University of Ljubljana · Faculty of Mechanical Engineering

PhD

About

46
Publications
18,633
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298
Citations

Publications

Publications (46)
Article
Full-text available
This article examines the measurement uncertainty in terms of the incident angle, the object colour and the measurement distance for a Computer Numerical Control (CNC) laser-scanning process. It describes a new method for predicting the measurement uncertainty that simultaneously considers all three parameters. A set of measurements with different...
Article
Full-text available
Currently, the production of a high-quality and highly aesthetic prosthesis is still mainly based on handwork and subjective comparison to get the proper shape and colour of the prosthesis, likely not by a first attempt. This article describes a case study whose goal was to investigate the possibilities of computer-aided surface reconstruction and...
Article
Full-text available
This article examines the influence of incident angle, object colour and measurement distance on the computer numerically controlled laser scanning process. To determine the physical background of these influences, the operation of the triangulation sensor, the surface reflection and the colour properties of the measured object were analysed. The v...
Article
In new product development courses, engineering students are introduced to the tools for addressing the functional or technical issues of the product. Problems arise when they need to empathise with the user to better understand how the product can be used in different contexts. To address this problem, we propose the use of storyboards as a tool t...
Article
Full-text available
Injection moulding is currently the most widely employed production method for polymer gears. Current standardised gear metrology methods, which are based on metal gear inspection procedures, do not provide the key information regarding the geometric stability of injection moulded gears and are insufficient for a thorough gear inspection. The study...
Article
Full-text available
In 3D optical metrology, novel approaches to characterise the geometrical quality of gears require a custom gear alignment process to produce reliable results. This study proposes a novel scan alignment method known as subsequent gear alignment (SGA). It emphasises on the proper alignment of the gear hole and follows the alignment of gears in real-...
Conference Paper
This paper proposes a framework for the systematic adaptation and digitalisation of engineering product development courses in the event of a crisis. Applicants can use resources of the framework to identify crisis-related boundary conditions that impact the delivery of education and are assisted in determining the necessary level of course digital...
Article
Full-text available
The study aims to investigate the possibility of employing machine learning models in the design of non-involute gears. Such a model would be useful for design calculations of non-standard gears, where there are no available guidelines. The aim is to create a decision-support model accompanying the Finite Element Method (FEM) simulations, from whic...
Article
Full-text available
Measurements of technical objects can be done with contact and non-contact approaches. Contact methods are accurate but slow. On the other hand, non-contact methods deliver rapid point acquisition and are increasingly being used as their precision mounts. However, multiple scanning parameters such as the incident angle, object colour and scanning d...
Article
Full-text available
Accurately manufactured gears require a reliable, holistic, and fast inspection method. Standardised geometrical parameters enable a consistent and regulated inspection of gears; however, current inspection methods include only a limited set of measurements for gears at specific locations. Therefore, a method to obtain holistic three-dimensional (3...
Article
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Nowadays, a large number of different tools that support early phases of design are available to engineers. In the past decade a specialized set of CAD-based tools were developed, that support the ideation process by generating different design alternatives according to the criteria given by the designer. Two types of tools are discussed in this pa...
Article
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This paper presents an experimental comparative study into the entrepreneurial mindset of engineering and business students at a Canadian University. The study wants to test if the discipline has an effect on students perceptions of their entrepreneurial mindsets, when engaged in a similar educational approach. Key findings show that entrepreneursh...
Article
In this paper, we explore the possible boundaries of open innovation by looking at the properties and problems associated with various forms of governance which all have claims to be regarded as open innovation. We look first at some basic forms of open innovation governance before looking at the case of a relatively neglected but increasingly impo...
Chapter
The ability to use a variety of CAD tools is one of the most basic competences expected of a modern engineer. It represents a language and a tool, and is used to communicate with other engineers anywhere in the world. While the basic CAD operations are fairly easy to learn, understanding the functioning of CAD tools requires more detailed knowledge...
Chapter
Reconstructing complex surfaces and geometries is generally performed with the use of optical measuring systems that allow the capture of large volumes of data in short periods of time. For the most part these are laser measuring systems, as they allow simple and fairly reliable blocking of the external effects on measuring. Understanding laser mea...
Chapter
Product development should begin by fulfilling the product’s primary functions during the concept stage, whereas its auxiliary functions are added later, during the detailed design. Nowadays, nearly all products with an external shape that is related with the human or natural environment are developed in such a way that the product shape is develop...
Chapter
Using a combination of surfaces and their transformations, one advantage of surface modelling is the ability to be able to create such CAD geometries that would not be possible only by combining the basic features of solid modelling. Using the example of a mass-market product—a hand blender—a number of procedures for working with surfaces are prese...
Chapter
This chapter deals with acquiring information about the shape of products by means of contact measuring devices. The objective of such measurements usually involves remanufacturing or changing the 3D models of an object, and controlling the geometric accuracy of the product, compared to its 3D model. Several types of measuring devices, sensors and...
Chapter
Reverse engineering has been practised since the beginning of technology. Fundamentally, it is about the identification of existing technical and natural solutions, and their reconstruction into new, identical or even improved technical solutions. Over the years it has flourished systematically, thanks to the development of new and technologically...
Chapter
Using practical examples, this chapter presents in detail the procedures for reconstructing CAD models from point clouds. These procedures differ depending on the product’s geometry. We present a procedure for reconstructing the objects where geometrically simple building blocks—surfaces—prevail, as well as two procedures for reconstructing objects...
Chapter
As a rule any CAD modelling should eventually result in a solid model or a system of solid models with all their functional and aesthetic details. Achieving this goal requires the user to understand modelling with features, solid models and the basic principles of the Boolean algebra of solid CAD bodies. As such, this is an essential part of surfac...
Chapter
The objective of this chapter is to present the use of 2D graphics (sketches, drawings, photographs, 2D documents) for the creation of 3D models. The application of 2D graphics is common and also immensely useful for reconstructing existing technical products, as well as for the development of new products in cooperation with industrial designers....
Chapter
A few control points of a B-spline are not enough for an accurate description of the geometry between the selected points that is supposed to follow physical laws. With a good understanding of the physical laws that you want to describe, and by reducing the distances between the interpolation points, it is possible to approach closely to the exact...
Chapter
This last chapter covers the details of fillets, i.e., the transitions between surfaces. Adding fillets and other aesthetic details is usually recommended just before the end of the modelling process. This strategy is mainly due to better control of the main function and shape of the product, which also includes changing and modifying the product a...
Article
Full-text available
Model-based definition and augmented reality are two emerging technologies, which enable a faster product development cycle and better dimensional control. They are an enabler of industry 4.0, and a better way to transfer the data to the user. Although each of the technologies is well researched, their combination presents a challenge from a resear...
Article
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Virtual mobility and communication over ubiquitous ICT channels is already having a significant share in modern business and industrial activities. Collaboration in dislocated, virtual teams, where team members have never met in person are common, daily-based activities in every larger international corporation. Due to number of various reasons, th...
Article
Full-text available
To be successful in the competitive workforce markets, graduates nowadays need more than just disciplinary skills and knowledge. The changes in how businesses operate, have brought about the need to develop highly skilled workforce that is equipped with generic skills, such as communication, creativity and problem solving, next to their discipline-...
Conference Paper
Since every culture has their own specifics, there is often the question, whether customers from diverse cultures perceive shape characteristics equally or differently? This study explore how two different cultural groups (Indian vs. Central European) of participants experience or response to predefined four types of product dimensions—aesthetic, f...
Conference Paper
Full-text available
To be successful in the competitive workforce markets, graduates nowadays need more than just disciplinary skills and knowledge. The changes in how businesses operate, have brought about the need to develop highly skilled workforce that is equipped with generic skills, such as communication, creativity and problem solving, next to their discipline-...
Conference Paper
Full-text available
The paper shows the approach to radical product redesign of sanitary flushing equipment which is conservative market niche product. The approach demonstrates use of the matrix of functions and functionalities (MFF) and elements of concurrent engineering to achieve a significant reduction of necessary resources during whole product’s lifecycle: prod...
Article
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Project oriented courses became a global trend among best engineering universities around the world in the past decade. They teach students not only core academic knowledge, but face students with real problem solving situations, where they need to express and develop their other virtues and skills, e.g. working in multidisciplinary teams, time and...
Article
Full-text available
The development of innovative and competitive products is crucial for any company's long-term success in the global information society and the global market. Educational engineering programs should facilitate the building of both technical and professional engineering competences. Project based learning, teamwork and real-life product development...
Conference Paper
Full-text available
This paper investigates and discusses the opportunities and possibilities of mobile and ubiquitous technologies in the NPD process. During the 2012 EGPR—internationally based NPD process in virtual environment, we made an analysis on technologies and services that were used for the purposes of the course. Our particular interest was, what platforms...
Article
Full-text available
In this paper the results of research about the influences of the incident angle, the measurement distance and object colour and reflectivity on the number of acquired points while using a lasertriangulation scanner on CNC-machines, are presented. The number of points is an essential parameter of a successful 3D surface reconstruction, although it...
Conference Paper
Full-text available
There has been a great deal of discussion about how important creativity is for the process of newproduct development. In the globalized, competitive world where there is a constant inflow of new consumer goods it is extremely important to establish a successful information network of knowledge sources (e.g., academia) and product producers (e.g.,...
Article
Full-text available
The change in the curriculum at The Faculty of Mechanical Engineering, University of Ljubljana, was an opportunity to influence the students' perception of the design and the new product development process. It is well known that case-study work stimulates the interest also for theory, however, the one step further that we took, was to build the ca...
Article
Full-text available
In a competitive knowledge-based environment the role of creativity in new product development (NPD) has increased. The university as the provider of scientific and technological knowledge has become a key player in NPD, as a supplier of knowledge and human capital and as the physical space for new enterprises. The boundaries between science and te...
Article
This Extended Technical Note shows that the final accuracy level of reverse engineered surfaces depends on scanning distance and scanning angle of the laser beam, hence it also depends on the morphology of the scanned objects. On scanning strongly curved objects, such as the ones with free form surfaces, the distance and impact angle of the laser b...
Article
Full-text available
This paper discusses the influence of surface topology on the accuracy of laser triangulation scanning results. Scanning distance and scanning angle of impact laser beam was found to be the most crucial interaction between the surface topology and scanning process. Therefore, we focused these two parameters while other parameters like microstructur...
Conference Paper
Full-text available
Changes in the business environment, responses of companies to these changes and the available information and communication technologies (ICT) pose a number of challenges to present and future product developers, as well as to educational institutions. An appropriate response to these challenges is to create a solid basis for strategies to combat...
Article
Full-text available
In presented paper a design model is developed which is used to find an optimal design space in order to improve precision and accuracy of reversed 3D models. Significant parameters and their mutual effects in scanning process are recognized with the help of Design of Experiments (DOE) principles, and in second step recognized significant parameter...

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Project (1)
Project
Current Call is to for support of Early Career Researchers from developing countries (see the update below and the conference website for more information) Academy for Design Innovation Management | 2019 London Research Perspectives In the era of Transformations Hosted by | Loughborough University London Conference dates | 18–21 June, 2019 London, United Kingdom Website | http://designinnovationmanagement.com/adim2019/ The Academy for Design Innovation Management 2019 London International Research Conference will be hosted by Loughborough University London. The ADIM International Research Conference 2019 is organised in collaboration with members from international partners: Hong Kong Polytechnic, Politecnico di Milano, the University of Twente, Oslo Metropolitan University, Macromedia University, Tecnun, The University of Southampton, Middle East Technical University, Universidade de Lisboa, RMIT University and Delft University of Technology. The last year's biannual conference was hosted by the Hong Kong Polytechnic. The 2017 four volume conference proceedings are available on the 2017 conference website http://designinnovationmanagement.com/dma2017/