<abstract xmlns="http://www.w3.org/1999/xhtml">The article deals with the contribution of <bold>Prof. Ing. Pavol Élesztős, CSc</bold>. in the field of engineering. He was born in 1948, studied and subsequently remained at the Faculty of Engineering at the Slovak University of Technology in Bratislava since 1968. Under his leadership 6 dissertation theses were defended in the study program of Applied Mechanics. He is the author of 1 monograph, co-author of 2 monographs, author of 30 reviewed scientific articles in journals, and over 250 original scientific papers published in domestic and foreign conference proceedings. Professor Élesztős is currently a Professor Emeritus and is known as a talented teacher.This article is a celebration of <bold>prof. Ing. Stanislav Žiaran’s, CSc</bold>. contribution to the field of engineering. Born in 1948, since 1966 he studied and subsequently continued his academic career at the Faculty of Mechanical Engineering, Slovak University of Technology in Bratislava. He has supervised 2 dissertation and 42 diploma theses, which were successfully defended in the study programs Applied mechanics and Mechatronics. Prof. Žiaran is the author to 5 monographs, 9 textbooks, 13 university textbooks, 6 manuals for the engineering industry and more than 290 original scientific papers published in domestic as well as international journals and conference proceedings. He has translated of 111 ISO and EN standards, 107 research reports for practice and he is the editor of 20 peer-reviewed scientific proceedings Noise and Vibration in Practice. He also presented 16 requested lectures at world congresses abroad. Prof. Žiaran is a gifted teacher of mechanics and his students appreciate his enthusiasm and knowledge he is sharing with them.</abstract>

Slovak University of Technology in Bratislava

Faculty of Mechanical Engineering, Institute of Applied Mechanics and Mechatronics

Preface – Dedicated to Prof. Ing. Pavel Élesztős, Csc. and Prof. Ing. Stanislav Žiaran, Csc. on the Occasion of Their 70th Birthday

<abstract xmlns="http://www.w3.org/1999/xhtml">Traditionally, the Furuta pendulum was used for testing advanced control strategies on a simple nonlinear and underactuated structure. In this paper, we investigate analytically and experimentally the dynamical description of the Furuta pendulum focusing on the effect of dry friction on a special bifurcation behaviour of the downward equilibrium position.</abstract>

Effect of Dry Friction on Bifurcation Diagram of Furuta Pendulum

<abstract xmlns="http://www.w3.org/1999/xhtml">Based on the theory laid down in the Part 1 [1] in this paper we are going to display applications in physics and especially in mechanics. After a short summary on coupled fields in mechanics, we generally analyze the analogies in mechanics. As the most important, the electrical analogy is discussed in details. By the electrical analogy based analytical solution we display the results of the coupled thermo-hygro problem with second sound. Finally, a few experiments are discussed, eg. experiments by electrical analogy, experiment on diffusivities, experiment on relaxation time, experiment on hydroglobe. This latter one leads to the engineering application of the problem.</abstract>

Cross-Coupled Heat and Moisture Transport Part 2/1: Applications in Mechanics

<abstract xmlns="http://www.w3.org/1999/xhtml">The paper deals with design and computation of precise positioning mechanism. The aim of mechanism is to transfer applied load without any change of position of parts in question. The stabilization of position is assured by elastic elements connected to reductor which is adjusted into correct position by an actuator. The functionality of mechanism and its stiffness and strength characteristics were checked by the finite element method. The computations were accomplished for prescribed displacement of reductor. On the base of this type of loading the behaviour of the structure was evaluated.</abstract>

Faculty of Mechanical Engineering, Department of Applied Mechanics and Mechanical Engineering

The Finite Element Analysis of High Precision Positioning System

<abstract xmlns="http://www.w3.org/1999/xhtml">The analytical model of a fluid filled cylindrical shell is used to analyse the wave propagation in the quarter wavelength absorbers. It has been found, that due to the strong fluid-structure interaction, the considerable wave speed reduction can be reached using a compliant shell. Thus via parametric studies, the dimensions of the absorbers are assessed to reach more efficient and compact design. Furthermore, the use of the compliant materials allows treating the fluid to be incompressible, which helps to simplify the calculations.</abstract>

Wave Coupling Analysis in the Elastic Waveguides of Quarter Wavelength Noise Absorbers

<abstract xmlns="http://www.w3.org/1999/xhtml">Two test stands for determining sound insulation in the frequency range above 5 kHz were made. One consisted of two horizontally adjacent reverberation rooms and a special source of high frequency sounds and ultrasounds. The other test stand consisted of a miniaturized test chamber and a special source of ultrasounds. The paper presents results of the preliminary measurements of sound insulation properties of different barriers in the frequency range above 5 kHz.</abstract>

Methods of Testing of Sound Insulation Properties of Barriers Intended for High Frequency Noise and Ultrasonic Noise Protection

<abstract xmlns="http://www.w3.org/1999/xhtml">The problem of active vibration control of weakly damped mechanical structures is potentially unstable modes of vibrations due to the positive feedback for some vibration modes. The paper will discuss the change of positive feedback on the negative one using all-pass discrete-time filters. These filters can be arranged in a cascade to stabilize many potentially unstable modes. The piezoelectric actuator as a source of force is used to damp vibration.</abstract>

Faculty of Mechanical Engineering, VSB – the Technical University of Ostrava

Department of Control Systems and Instrumentation

Faculty of Mechanical Engineering, Slovak University of Technology in Bratislava

Institute of Applied Mechanics and Mechatronics

All-Pass Filters in the Systems of Active Vibration Control of Weakly-Damped Systems

<abstract xmlns="http://www.w3.org/1999/xhtml">The aim of this paper is to design, implement, test and compare several tracking filtration methods for predictive maintenance of a jet engine. Based on literature review multiple possible methods are described. Appropriate ones selected for further implementation are peak filtration, coherent demodulation, Vold-Kalman filtration and order analysis. Methods are tested to meet criteria set by an aircraft manufacturer and compared using simulated signals.</abstract>

Tracking Filter Design for Predictive Maintenance of Jet Engine – Different Approaches and their Comparison

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Strojnícky časopis - Journal of Mechanical Engineering

 The Strojnícky časopis – Journal of Mechanical Engineering publishesoriginal scientific and application oriented papers, dealing withproblems of modern technologies in the fields of mechanicalengineering including:   structural and solid mechanics,  fluid mechanics,  mechatronics,  multi-physical problems,  biomedical engineering,  advanced micro and nano materials,  structural and machine design,  virtual and rapid protyping,  power and process engineering,  strength of materials, creep, plasticity,  fracture mechanics and fatigue,  durability and reliability of engineering structures,  production engineering, etc.   This considers the following activities in mechanical engineering andcross-linked branches as modelling, simulations, experiment,construction, testing, measuring, operation, production, environmentalaspects, quality, etc.  The Strojnícky časopis – Journal of Mechanical Engineering publishesthe following types of papers:   Regular Articles should describe original research of highquality or new application in the field of Mechanical Engineering.  Review Articles will generally be specially commissioned,however, suggestions for topics and authors are welcomed by theEditor-in-Chief.  Technical Notes provide rapid publication of important newcontributions.   Please see our Guide for Authors for information on articlesubmission. If you require any further information or help, please donot hesitate to contact us.  The submitted papers are peer-reviewed and tested against plagiarism.  The journal does not have article processing charges (APCs) norarticle submission charges.  Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 