Welcome to the BUT Digital Library - an institutional repository operated by the Central Library on the DSpace system.
Do you want to deposit your article or preceedings into Digital Library? It is very simple. You can find all the information in the manual published online on BUT Portal of libraries.
Central Library supports open access to scientific publishing - Open Access.
You can also request for grant for open publishing from Open Access Fund You can find more information OA fund web page.
Into the Digital Library is integrated citation manager Citace PRO. It will allow you to easily create a bibliographic citation or save a record in the manager.
Communities in DSpace
Select a community to browse its collections.
Recent Submissions
Item
A Case Study on Assessing the Capability and Applicability of an Articulated Arm Coordinate Measuring Machine and a Touch-Trigger Probe for On-Machine Measurement
(MDPI, 2024-11-23) Sámelová, Vendula; Marek, Tomáš; Jelínek, Adam; Jankových, Róbert; Maradová, Karla; Holub, Michal
In modern manufacturing, there is an increasing demand for reliable in-process measurement methods directly on large CNC machine tools, eliminating the need to transport workpieces to metrological laboratories. This study assesses the capability and applicability of an articulated arm coordinate measuring machine and a machine tool touch-trigger probe when measuring to a specified tolerance of 0.05 mm in a production environment. Experiments were conducted using the KOBA calibration standard and included measurements with and without applying the articulated arm coordinate measuring machine leapfrog method. The results were evaluated according to ISO 22514-7:2021 and ISO 14253-1:2017, which establish criteria for measurement system capability. The findings revealed that neither measurement system met the capability requirements of ISO 22514-7:2021, particularly due to unsatisfactory QMS and CMS values. However, under ISO 14253-1:2017, both systems were deemed conditionally suitable for verifying conformity to the specifications, with the articulated arm coordinate measuring machine showing lower applicability when using the leapfrog method. This research supports the idea that unreasonable demands for compliance with current standards may lead to questioning of the systems that previously met older standards. The study contributes to the ongoing discussion on integrating advanced metrological tools into the manufacturing process and underscores the need for careful evaluation to ensure the capability and reliability of measurement systems in industrial practice.
Item
On moduli and arguments of roots of complex trinomials
(Mathematical Sciences Publishers, 2024-11-20) Čermák, Jan; Fedorková, Lucie; Jánský, Jiří
Root properties of a general complex trinomial have been explored in numerous papers. Two questions have attracted a significant attention: the relationships between the moduli of these roots and the trinomial’s entries, and the location of the roots in the complex plane. We consider several particular problems connected with these topics, and provide new insights into them. As two main results, we describe the set of all trinomials having a root with a given modulus, and derive explicit formula for calculations of the arguments of such roots. In this fashion, we obtain a comprehensive characterization of these roots. In addition, we develop a procedure enabling us to compute moduli and arguments of all roots of a general complex trinomial with arbitrary precision. This procedure is based on the derivation of a family of real transcendental equations for the roots’ moduli, and it is supported by the formula for their arguments. All our findings are compared with the existing results.
Item
Working on the Structural Components of Evolutionary Approaches
(Science and Technology Publications, Lda, 2024-11-20) Tzanetos, Alexandros; Kůdela, Jakub
Several researchers have turned their attention to the structural components of Evolutionary Computation and Swarm Intelligence-oriented approaches. This direction offers various opportunities, such as developing automatic design and configuration frameworks and integrating operators and mechanisms addressing known limitations. This work lists recent operators and discusses promising mechanisms found in existing atureinspired approaches. It also discusses how these algorithmic components can be integrated into modular frameworks and how they can be assessed and benchmarked. The work aims to emphasize the importance of the research direction about nature-inspired mechanisms and operators in the Evolutionary Computation field.
Item
THE ANALYSIS OF DYNAMIC EFFECTS FROM THE TRAIN SET AT DIFFERENT DRIVING SPEEDS
(Studio D - akustika s.r.o., 2024-11-21) Smutný, Jaroslav; Janoštík, Dušan; Pazdera, Luboš; Štukavec, Milan
The article is devoted to the problem of measuring selected dynamic parameters at a driving speed of 160 km/h to 200 km/h. The article contains a theoretical introduction to the issue, further describes the real measurement of dynamic-acoustic parameters with subsequent evaluation and comparison of measured data and parameters. The conclusion includes a presentation of the obtained results, recommendations for other similar measurements and, in particular, recommendations for railway infrastructure managers.
Item
COMPARISON OF GRAND PIANOS ANT. PETROF AND MISTRAL
(Journal Akustika, 2024-11-24) Jirásek, Ondřej; Peloušek, Tomáš
This paper describes the measurement of two Petrof grand pianos: Ant. Petrof and Mistral. The goal was to compare their parameters, i.e. harmonic spectra, decay time, relative sound level, spectral centroids, and cumulative line spectra (CLS). The complete range of 88 tones (keys) was measured in the anechoic chamber of Petrof, where we used a play-bench for precision. The obtained data were analysed and put into comparison. This analysis was supplemented by a comparison of selected samples (keys A2 and A4 played in forte and piano dynamics) to samples of three competing brands (Shigeru Kawai, Yamaha, Steinway).