In this paper, an analytical calculation of load on bridge crane carts winch wheel loads was performed based on which FEM analysis and topological wheel optimization were performed. After the calculation, a standard wheel diameter was adopted. During FEM analysis in the CAD system, SolidWorks noted that certain surface areas had extremely low stress values, which was the main reason for the topological optimization of the wheel. The topological optimization of the geometric 3D model of the wheel is made in the CAESS ProTOp software, resulting in optimized 3D geometric wheel model. These models offer a number of advantages, such as saving materials to produce, reducing their own weight, balance stress conditions and easy customization model optimized technologies of additive manufacturing. This model of analysis and optimization was performed on the laboratory model of the bridge crane and it is applicable to all types of cranes.

The purpose of a car jack is lifting the car and maintaining it at a certain height during different repairs. This paper focuses on the design of car jack, which belongs to the basic equipment of cars. Cars jacks are used mainly for changing tires and small repairs of a car. The aim of this paper was to create a parametric CAD model of a car jack and carry out numerical structural analysis of the car jack using the created parametric CAD model. The development of the parametric CAD model and structural analysis was performed using the CATIA V5 system. This paper describes the modern way of creating more complex mechanisms, which support quick modification of its parameters, and thus the entire design. The whole model of the car jack was parametrized. The stresses obtained by finite element method (FEM) analysis were confirmed with the analytical calculation in characteristic parts of the design, with some exceptions. At the end of the paper, an analysis of the obtained results was performed, on the basis of which specified conclusions were made.

Difference between industrial designer and product designer is not precisely defined. There is a lot of discussions and misunderstandings about these two professions. What is the job of industrial designer and what is the job of product designer? This question if often asked from people, which want to hire someone to design a new product for them. Through this research, same real-life design contest is given to group of students from Faculty of Mechanical Engineering, Department of Mechanical Design, at Industrial design course and to group of students from Academy of Fine Arts, Department of Product Design as product design project. Goal of the contest was to design an upholstered chair for indoor use with a modern and refined style. Goal of this research was to find some unique characteristic of designs from industrial designers and product designers. Resulted designs were evaluated analysing the fulfilment of the requirements criteria defined by contest and analysing additional criteria, which is important for new product design. Analysing the resulted designs some important conclusions are made. Most important conclusion is that industrial designer can be product designer but product designer cannot be industrial designer. For product design, engineering knowledge is not necessary, but for industrial design, it is most important.

– There is a lot of papers concerning gears topology optimization, but all of them are limited to the topology optimization of gear body. Gear tooth is not taken into consideration so far. Gear tooth was not optimized before because optimised structure could not be produced. By advancing of additive manufacturing technology, now, gear tooth can be produced in a form of shell body with empty space inside. In this paper, mass of spur gear tooth is optimized in relation to Von-Misses stress on critical places on the gear tooth. Optimization goal is to find optimal shell thickness of shell body spur gear tooth.

Intensive utilization of computers is especially emphasized in the field of industrial production, where use of computer applications achieves significant savings in regard to the time required for manufacturing of products. Shortening of the production time decreases the production costs and new products are faster introduced to the market, thus making the company more competitive. In addition to the shorter time for production, better precision and accuracy is also accomplished, resulting with better product quality at the end. Due to the fact that, for the reason of cost-effectiveness of manufacturing of tools, processing of sheet metal on presses is primarily performed in the course of serial production, this paper focuses on an analysis of the use of computers in the process of design of tools for punching and cutting of sheet metal on presses. The presented methodology encompasses all phases in the process of design of tools – from planning the work piece until the final design of the tool for punching and cutting, with an emphasis on the activities performed exclusively by computer applications. The result of this research is a 3D geometrical model of a tool for punching and cutting, with an explanation of characteristics of its construction parts, calculation of its executive parts, analysis and simulation of operation of the tool, and finally the conclusion on the representation and importance of the utilization of computer applications in the process of design of such tools.

The subject of this paper is conceptual design and stress analyses of the composite frame for a special mauntain bike. The existing solutions for frames of this type were analyzed, and the design was conceptualized, which was thoroughly analyzed for extreme loads occurring on the Dirt Jump Mountain Bike Frames. By using the methodology of conceptual design, we have obtained a conceptual solution of the frame, which has been evaluated as optimal one based on a set of criteria. We later confirmed this hypothesis by the stress and other analyzes we carried out to validate the frame, and found that the chosen conceptual solution really meets all the criteria.

Integrated intelligent CAD systems (IICAD) can be developed for different purposes. The objective of this article is to emphasize the advantages of the use of IICAD systems in comparison with the classic systems. The article shows a structure of one such developed system, namely the IICADv system. This system is used for automatization of activities undertaken during the realization of certain phases of the process of designing of shafts, especially the synthesis phase. The development of a module for computation of the shaft and integration of the entire system was performed in the C# programming language, while shaping of the shaft was performed in the CATIA system. The interlinking was performed thanks to previously modelled basic 3D models. In such way, utilizing the advanced IICADv system, the computation and shaping of the shaft is done almost instantly. The results of the use of the IICADv systems are generated final 3D models of the shaft, ready for use by numerous other applications.

The scope of research of this paper is designing, modelling and analysis of tools for cold forging of rolling bodies of roller bearings. Basic principles of metal processing using plastic deformation are presented for better understanding of the forging process. Geometric tool modelling required knowledge of interconnections between individual tool elements, and their role in the forging process. The paper presents geometric and mathematical modelling of tools, and simulations of their operation. This presented a complete overview of movements of individual tool elements, which improved its functionality. In order to minimise errors in tool making and its stability, stress analysis and material yield at forging were taken into consideration.

The cranes are now not replaceable mode of transport of materials and finished products both in production halls and in the open space. This paper made the whole analytical calculation of double girder bridge cranes to be used in laboratories exclusively for testing, determined by the maximum bending stress and deflection of the main girder. After calculating the dimensions, we created a model cranes in software CATIA V5. The same model was subjected to FEM analysis of the same name software. At the end of the paper comparison has been done. The objective of the calculation and analysis of the model was to develop a model crane and to serve for the next tests. Dimensions of the crane are given according to the laboratory where it will be located.

This paper describes the stress analysis of devices for external fixation based on composite materials and stainless steel, which was performed numerically in the software CATIA V5 and which results are verified experimentally. The aim of this paper is to explore the possibility of introducing composite materials in the construction of the connecting rod fixator comparing values of displacement, principal and von Mises stresses at characteristic points structure. We investigated constructional performance of external fixator with a connecting rod formed from composite materials, and other components of external fixator formed from stainless steel. CAD model of external fixator was made in the software system CATIA V5. Also, in the same software was conducted structural analysis of external fixator under axial compression, and results were compared with experimental test. Finally, in concluding observations, we noted some advantages and disadvantages of the application of composite materials at the external fixator.

The proven safe operation and the high availability of aerial ropeways is mainly thanks to their design. This is based on the manufacturer’s extensive experience as well as the strict application of the relevant rules and norms. In that regard, this paper describes an analysis of the haulage ropes on ropeways in case of accidental loads. In solving this problem, analyzed ropeway system with sufficient accuracy was modeled as a system with three degrees of freedom. For solving differential equations we have used the software “Wolfram Mathematica”. At the end of the paper, we discuss the results of the dynamic forces in the haulage ropes in a certain time interval, and the results of the safety factors which in this case are sufficient to ensure reliable operation of the system.

This paper describes a structural analysis of the CAD model three versions fixators Sarafix which to explore the possibility of introducing composite materials in the construction of the connecting rod fixators comparing values of displacement and stiffness at characteristic points structure. Namely, we investigated constructional performance of fixators Sarafix with a connecting rod formed from three different composite materials, the same matrix (epoxy resin) with three different types of fibers (E glass, kevlar 49 and carbon M55J). Results of structural analysis fixators Sarafix with a connecting rod made of composite materials are compared with the results of tubular connecting rod fixators made of stainless steel. After comparing the results, from the aspect of stiffness, we gave the final considerations about composite material which provides an adequate substitution for the existing material.

This paper describes a structural analysis of the CAD model three versions fixators Sarafix which is to explore the possibility of introducing composite materials in the construction of the connecting rod fixators comparing values of displacement and stiffness at characteristic structure points. Namely, we have investigated the constructional performance of fixators Sarafix with a connecting rod formed from three different composite materials, the same matrix (epoxy resin) with three different types of fibers (E glass, kevlar 49 and carbonM55J). The results of the structural analysis fixators Sarafix with a connecting rod made of composite materials are compared with the results of tubular connecting rod fixators made of stainless steel. After comparing the results, from the aspect of stiffness, we gave the final considerations about composite material which provides an adequate substitution for the existing material.

Research activities in the field of modern Biomedical engineering show a more intense trend towards the use of sophisticated engineering measurement tools in order to optimize existing medical devices. External fixators are such an example of the above mentioned. Critical design parameters are being optimized by the use of existing engineering research methodology. One of the most important parameter for external fixators that have to be tracked are the interfragmentary displacements between the proximal and distal bone segment. This is usually achieved by the use of a finite element method. Another way is the use of displacement sensors or transducers. To verify these numerical results and to gain additional real life footage of interfragmentary displacements during testing, the use of a high speed camera has been taken into consideration. This paper compares previously acquired numerical data for a specific external fixator design parallel to the same setup whilst being recorded with a high speed camera. Results indicate good superposition with previously obtained data.

This paper presents research results of a stress analysis of a Sarafix external fixation system, applied to an unstable tibia fracture. A stress analysis was performed using Finite Element Analysis (FEA) and experimental stress measurements using strain gauges. Research was performed on the Sarafix external fixation system controlling values and directions of principal stresses at the measuring points in the case of axial compression. Sarafix proved to be mechanically stable, confirming good clinical results in the treatment of bone fractures. Keywords: Computer Aided Design (CAD), Finite Element Analysis (FEA), experimental stress analysis, CATIA, principal stresses.