In this study we examined the effect of topography and corrosion resistance of aluminum alloy 6061 which has been anodized on a mixture of phosphoric acid and oxalic acid by using titanium cathode. Surface topography was tested with the N8 NEOS Bruker, corrosion testing performed by Tafel method using a potentiostat Autolab (PGSTAT302N), while testing the immersed test to determine the condition of the (…)
This article brings selected knowledge from the long-term cooperation between the Brno University of Technology, the Faculty of Civil Engineering, the Institute of Technology of Building Materials and Components, and the Academy of Sciences of the Czech Republic, v.v.i., Institute of Geonics, Ostrava – Poruba in the field of the interaction of water jets and concrete, especially with regard to the use o (…)
Ice jet technology also known as ice abrasive water jet (IAWJ) is a prototype technology currently under development. In IAWJ technology ice particles made from water are used instead of mineral abrasive. The aim is to increase the productivity of pure water jet (WJ) while keeping its advantages, producing no other waste product but water. Technology has great potential to be used in food and medical in (…)
This paper describes the temperature distribution of an organic light emitting diode (OLED) panel calculated by a finite element method (FEM) and measured. Organic LEDs (OLEDs or organic electro luminescence) are examples of solid-state lighting (SSL) that have been rapidly developed and applied in many practical fields owing to their high efficiency and on mercury-free operation. However, energy is los (…)
This paper discusses the problem of trajectory planning for robotic manipulators at minimal cost. The paper deals with problems of obstacle avoidance during the manipulation and technological activities of the industrial robot. A system has been designed to find a trajectory that is both collision-free and of minimal distance. The goal is to reduce workplace costs with the robot and thus increase the ef (…)
Unconventional machining methods, or also progressive machining methods, such as laser cutting, waterjet cutting, ultrasound machining, etc. are undergoing a very rapid development. Laser cutting machines often evaluate even 80 parameters in real time. Their advantage is the significantly higher productivity. Many values are defined by the machine manufacturer and can not be changed for a given laser. F (…)
The article is focused on the practical test of stator coil isolation by a continuous winding system. The winding system has two types. Discontinuous winding requires precise manual winding of the material. Discontinuous winding is time consuming. The use of the winding machine is limited by a maximum voltage of 11 kV. With continuous winding, the machine winding is accurate, the winding time is lower a (…)
Strict legislative requirements for environmental protection and tendency to lower consumption of fossil fuels force the car producers to still find new possibilities in the car-body design. As one of such possibilities there is effort to apply materials with low specific weight. Among these belong also Al-alloys that are affordable, but in comparison to steels also difficult to be technologically proce (…)
This article deals with the creep modulus process comparison of two structurally different materials. These are specific materials HDPE (high density polyethylene) and LDPE (low density polyethylene). These materials were chosen because of their shared monomer from which they were created and differ only in the chain shape. Subsequently these materials were beta radiation crosslinked at six various dose (…)
Thanks to the open source project RepRap the 3D printing technology has been delivered from laboratories to normal households. Since the beginning of the project, 3D printing has been constantly gaining in popularity thanks to the relatively simplicity in the production or transformation of ideas into physical models. In addition to the choice of hardware for open-source 3D printer an important factor d (…)
This study presents a stress analysis of hybrid plating constructions on femur fracture. The bone screw mounting configurations have successfully modeled with ANSYS Multiphysics/LS-Dyna v.18.1. The bone model was achieved from the CT-scanning of the human femur bone. The interactions between femur bone and hybrid plating were observed. Locking compression plates with 8 holes for bone screws were used. A (…)
Spiral bevel gears have been traditionally machined on special machines commonly known as Gleason, Oerlikon, or Klingelnerg. One of disadvantages of the traditional method is high cost. This paper presents a practical method based on CAD/CAM and 3-axis CNC machining to manufacture spiral bevel gears of the Gleason design. This method can be considered as an alternative method to the traditional methods. (…)
The article deals with the evaluation of microclimate conditions at the workplaces of the engineering workshops. By measuring the conditions of the thermo-humidity parameters, these were objectified and compared with the results of the subjective evaluation, obtained by the questionnaire survey. Based on investigators' research up to the present day, these outputs are not always consistent, and therefor (…)
The article deals with the issue of a new type of solar absorbers, which have a direct flow structure and a structured surface, which consists of pyramidal cavities. This solution increases a thermal efficiency. In the first part, possible parameters that affect the thermal efficiency of solar collectors are described and further, a simulation of a dependence of a resulting absorption coefficient at a p (…)
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