Design of Machines and Structures

The effect of bowing technique on violin sound

Károly Jálics, Károly Jálics, Sr — Sat, 30 Nov 2024 00:00:00 +0100

By the bowing of a violin especially by folk and gipsy bands a special bowing technique can be observed. Often a diagonal (not perpendicular to the string) bowing, resp. the bow slids onto the fingerboard. This study deals with the effect of this special bowing technique on the emitted sound of a violin and compares it with the classic detaché bowing technique on all four strings.

Industry 5.0. Present or Future?

Péter Ficzere — Sat, 30 Nov 2024 00:00:00 +0100

Industry 5.0 represents a significant evolution in industrial development, building upon the technological foundations of Industry 4.0. Highlighting human-centric and sustainable approaches, Industry 5.0 aims to integrate human creativity and technology seamlessly. While previous industrial revolutions were marked by technological advancements –such as steam engines, electricity, and digital transformation– Industry 5.0 emphasizes the synergy between humans and machines. This collaboration is expected to drive production efficiency and ethical practices in industry, creating a more resilient and human-focused future. This paper investigates the need of education systems to prepare the students to i5.0.

Mechanical design of a Cartesian robot

Dániel Fekete, László Rónai, József Lénárt — Sat, 30 Nov 2024 00:00:00 +0100

This paper investigates the assembling options of a cartesian type robot, which can be used for material handling or 3D printing purposes. The structure has three ball screw driven linear units, which will be controlled by a microcontroller. The requirements of the structure to use as a 3D printer are defined. The solution selection matrix is constructed in order to choose the appropriate configuration of the system.

Design conception of a food dehydrator

Pálma Kapitány, László Rónai — Sat, 30 Nov 2024 00:00:00 +0100

Nowadays, the household is unimaginable without the three main pillars of the technical field, which are mechanical engineering, electrical engineering and IT. The paper deals with the design conception of a food dehydrator unit. These types of devices are capable of drying fruits and mushrooms. The article covers the design conception of a specific version, and then by building a test system, it becomes possible to check the correctness of the control program code belonging to the system.

Advancing plant cell wall modelling: parametric finite element approach

Ágnes Takács, Judit Albert — Sat, 30 Nov 2024 00:00:00 +0100

The study utilized genetic algorithms to optimize the mechanical properties of wheat stems, focusing on axial stress, shear stress, bending stress, and critical buckling force. The results indicated that the optimized stem design could withstand applied forces with adequate safety margins, enhancing lodging resistance. Future work will include advanced optimization techniques and validation to further improve wheat stem structural integrity.

Examination of condition of rolling bearings

Dániel Tóth — Sat, 30 Nov 2024 00:00:00 +0100

Bearings operating properties impact the function of the whole machine therefore their investigation is an important topic. Early detection of failure of bearings allows for the replacement of them during planned maintenance, thus avoiding sudden downtime or unexpected accidents. There are several methods for monitoring the operating conditions of bearings, which help determine the residual lifetime of the bearings. This paper focuses on a test procedure which can be used to determine the condition of rolling element bearings.

Comparing the market history of mobile phones and electric cars by using sigmoid curves

Ferenc János Szabó — Sat, 30 Nov 2024 00:00:00 +0100

The time curves of market history for mobile phones and for electric cars is compared by sigmoid curves. Creating the approximate sigmoid curves of the curves showing the real data of products sold in function of the time, it is possible to find similarities and differences of the time history of the market of mobile phones and electric cars. One of the most important decisions during this investigation is to decide, which curve describes better the product investigated: Logistic curve (Pearl-Reed curve) or Growth curve (Bertalanffy)? On the basis of many characteristics of these curves, in the second step of the study it is possible to characterise the market of the products, and the comparison can give important points of view for the understanding the present situation of the markets and to try to forecast their possible future.

Manufacturing issues with 3D-printed gears mechanical properties

Karam Shaaya, Ferenc Sarka — Sat, 30 Nov 2024 00:00:00 +0100

Additive manufacturing, often known as 3D printing, is substantially revolutionizing the industrial environment by turning new ideas into tangible items. This technology promotes innovation in various industries, like healthcare, aerospace and automotive, by allowing for the development of sophisticated, one-of-a-kind designs while reducing waste and expenses. Prompting improvements in production, additive manufacturing demonstrates a great deal of design variation while also being very efficient. This technology reforms traditional production techniques and makes solutions that were previously impossible. This research delves into the mechanical properties and production challenges of additively manufactured 3D- printed gears. The evaluation of gear performance focuses on the influence of essential characteristics, including the analysis of printing orientation and infill patterns, among other factors. Mechanical properties such as tensile and bending strength rise in a horizontal direction; conversely, in a vertical structure, the reverse is true. Concentric, grid-like infill patterns improve materials like PLA and PLA+ in strength and surface quality. This study examines significant challenges, such as thermal expansion and air gaps that affect gear reliability. Effective solutions require refining gear designs, enhancing heat dissipation, and optimizing material properties. The research findings improve comprehension of how 3D-printing parameters affect gear performance, offering valuable insights for the design and manufacture of durable, high-performance 3D-printed gears in industrial applications.