Gears are torque and motion transmision elements required for gearboxes. Adequate consideration must be given to the material selection and heat treatment of these gears. Inappropriate material selection or heat treatment will lead to premature failure of the manufactured gears or early refurbishment. In our publication, we present a number of practical failures that can be traced back to wrong material selection or heat treatment operation.
In this article, a finite element modeling of the upsetting of a cylindrical workpiece is presented. In the modeling, the effects of friction, heat generation from deformation, and heat losses from conduction and convection are considered.
The aim of this paper is the presentation of the general form of the constraint equations necessary to calculate the accelerations occuring on a five sided spatial mechanism. Using these equations the computing of the accelerations for any part of any plain or spatial mechanism will be possible.
The constraint equations of the acceleration are obtained by computing the time derivatives of the velocity equations (which in general form are given by  and ) followed by the correspondent grouping of the unknowns.
During technical education it is a very difficult yet essential task to develop the good logical engineering thinking of students or pupils. One main part of this thinking is the determination of the optimal set of required input parameters for the calculation task mentioned above. The LogTreeMM (Logical Tree of Mathematical Modelling) method can help to solve this task. The aim of this paper is to show modification of the LogTreeMM method to determine the required parameters of a mathematical model by a simple case study.
The aim of our work is to compare the results of a virtual model to measure heat transfer data for butt welded joints. The primary goal is to compare real-time measured temperature with the software simulated data. The virtual model is a copy of the real product, technically a virtual prototyping process is examined. Prior to any production process such as joining by butt welding, real process parameters are tested on the model and later by experiments. In the case of many parts, the joining process is a key technology, where knowledge of the thermal effects of welding on the microstructure in the heat affected zone and the joint are vital.
Robert Bocsi, László Hanák, Dóra Rippel-Pethő and Zoltán Hodai
Modelling heat transfer problems are often carried out by using experimental data not only pure analytical methods. These solutions are affected by several parameters, so the deduction of formulas, based on complicated interactions, cannot be solved without theoretical knowledge. our goal is on base of similarity theory building a model of heat transfer properties of an open pond that installed in climate of Hungary. in our work we have calculated heat transfer on the surface of an open pond by evaporation for the base of future studies.
Viktor Balázs, László Szilágyi, Antal Apagyi and Timotei István Erdei
Nowdays, accidents tend to happen because our attention is being split up by the ever-growing influx of information, losing the focus from the driving, traffic signs, and other signals. The consequences of these minor or major accidents weight down on our shoulders. During our project, we tried to eliminate, or help this issue, using present technology, improving upon that, trying to avoid these accidents. Our task consisted on implementing a software, that could identify traffic signs from any video streams.
Nowadays, international and national events clearly point out the need for cooperation between different defense organizations in crisis and emergency situations (disaster events, migration issues, and other emergencies) for successful tasks. The fundamental basis of this cooperation is always the command and control activity supported by modern technical equipment that ensures the coordinated implementation of tasks. The key, human element of info-communication support is the preparation and training of the successful professionals. In this paper, the authors intend to present the importance of vocational training.
In this work, the moisture absorbance of 6 different building insulation materials are inspected in a laboratory environment. After being dried to a constant weight, the materials were exposed to five different, equally distributed, relative humidity environments, ranging from 0% to 100%. At each chosen relative humidity range the weight of absorbed water content was measured. Then the results were analysed. The insulation materials were then ranked using results from this and the author’s previous work.
Today’s vehicles are becoming more and more complex in order to meet the ever increasing safety and comfort requirements. Most people usually do not consider the car sitting in their driveway to be on the leading edge of new technology. However, for most people, the personal automobile has now become their initial exposure to new intelligent computational technologies such as fuzzy logic, neural networks, adaptive computing, voice recognition and others. This paper explores the sensory-network of electric vehicles and analyses it from a security and reliability perspective.