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1
Content available remote Comparison of Methods for Measuring Reverberation Time
Melnyk M., Kernytskyy A., Lobur M.
Machine Dynamics Research
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2018
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Vol. 42, No. 2
27--34
EN
The article presents the results of an experimental evaluation of the reverberation time of the lecture auditorium in the Lviv Polytechnic National University. For their further analysis, a sub-system of batch processing of audio files with a registered response of the room for excited impulse noise has been developed. To determine the bypass signal, Schroeder method was used, and the least squares method was improved by pre-processing of the signal using the MM method. The influence of the number of neighboring points of the MM method on the accuracy of the reverberation time by the least squares method is investigated. A comparison of the Schroeder method and the least squares method is made, which makes it possible to establish that Schroeder method is more precise. The average error of this method for 6 experiments against the Dirac system was 0.02 sec, whereas for the least squares method it was 0.06 seconds. The developed subsystem of the batch analysis of the registered response of the premises for pulsed noise makes it possible to increase the speed and efficiency of processing the results of experiments.
2
Content available remote Implementation Features of Fibrous Composite Microlevel Structure Model Construction Based on Bezier Curves Generation and OpenCL Technology Usage
Jaworski N., Iwaniec M., Lobur M.
Machine Dynamics Research
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2017
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Vol. 41, No. 3
47--62
EN
In this paper, the implementation features of fibrous composite materials microlevel structure models constructing method that is based on Bezier curves generation and the technology of high-performance distributed computations OpenCL usage, are described for the first time, which makes a practical value. The formalized algorithm and its corresponding program code are presented.
3
Content available remote Models Based on Mechanical Properties of Biological Cells in Microfluidics
Lizanets D., Lobur M., Matviykiv O.
Machine Dynamics Research
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2015
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Vol. 39, No. 3
127-135
EN
The paper is devoted to the modeling deformation of biological cell in microfluidic microchannel devices. The background and purpos of actual research is developing mechanical model of the biological cell shell for improving simulation and design of microfluidic lab-chip diagnostic devices.
4
Content available remote Design of a Short-Time Energy Saving Tank (Reservoir) for Light Weight Transport Vehicle
Kulpa M., Stephan U., Lobur M., Kolesnyk K.
Machine Dynamics Research
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2015
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Vol. 39, No. 1
59-66
EN
The main goal of the paper is to show the new approaches to the design and developing of a new product, which is energy-saving and cab ensure gains in traction and braking force taking into consideration the customer’s needs. This can be advantageous from the point of view of energy saving in the automobile industry.
5
Content available Verilog – ams model of comb-drive sensing element of integrated capacitive microaccelerometer for behavioral level of computer aid design
Holovatyy A., Teslyuk V., Lobur M.
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
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2014
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Vol. 3, No 4
49--53
EN
The article presents Verilog – AMS model of the comb-drive sensing element of the integrated capacitive microaccelerometer. The suggested model allows to simulate the reaction of the sensing element effected by the applied force of acceleration, changes of its comb-drive capacities, output voltages and currents for determining its constructive parameters and for analysis of the mechanical module of the integrated device at the behavioral level of computer-aided design.
6
Content available remote The Analysis of Distorting Effects in Atomic Force Microscopy Based on Cantilever of Mechanical Type
Dupak B., Lobur M., Ivantsiv R., Kosobutskyy P.
Machine Dynamics Research
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2013
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Vol. 37, No. 2
22-28
EN
Analyzed the two main methods of AFM, the effect of which is essential in the research of individual microscopic adsorbed on the surface of a solid substrate: the broadening of the profile and the effect of understating the AFM height images of objects.
7
Content available remote Sensors on the Basis of PorSi for MEMS
Lobur M., Kosobutskyy P., Naperalski A., Monastyrski L.
Machine Dynamics Research
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2013
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Vol. 37, No. 2
60-64
EN
We propose to use technology of electrochemical formation of low-dimensional porous silicon(porSi), which is compatible with the standard technologies of silicon VLSI, for creation of sensor part of MEMS "Lab-on-chip" type.
8
Content available remote Mechanical Behavior and Modeling of Initially Stressed Membranes
Maj C., Zając P., Szermer M., Lobur M
Machine Dynamics Research
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2013
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Vol. 37, No. 2
65-70
EN
Modeling of microstructures is one of the most important step in the project. In its early stage the analytical modeling is usually used. The need of use of as fast as possible method is a primary source of errors for each designer. The simple analytical model is commonly used in order to obtain basic performance of the device. However, it is the source of error due to some simplifications. In this paper, the comparison between the analytical model and FEM simulation is presented taking into consideration maximal membrane deflection, membrane form and stress distribution. The initial stress of the membrane has been taken into account as a primary source of mismatch. Finally, the error depending of initial stress has been estimated. All simulations has been performed for small deflection of the membrane.
9
Content available remote Lattice Boltzmann Method for Simulation of Microfluidic Mixing in Modified T-shape Micromixer
Lobur M., Dmytryshyn B.
Machine Dynamics Research
|
2013
|
Vol. 37, No. 3
5-11
EN
This paper presents the 2D simulation of modified microfluidic T-shape micromixer with the lattice Boltzmann method (LBM) using the palabos library for simulation, that runs on multi-core CPUs and GPUs. T-micromixer is modified with obstacles in the form of circles. The walls of micromixer are modified to triangular shape. This modifications allows to achieve better mixing of fluids in microchannels. The modeling was performed by using the palabos library for D2Q9 LBM lattice.
10
Content available remote Development Process as an Improving Factor for a Complex Interactive Educational Process
Farmaga I., Halushko O., Marikutsa U., Lobur M.
Machine Dynamics Research
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2013
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Vol. 37, No. 2
29-33
EN
This paper describes practical purpose, practical aspects and results from educational point of view of evolving students into the development process.
11
Content available remote Analytical Thermo-electric Model of Uncooled Microbolometer
Zając P., Maj C., Szermer M., Lobur M., Napieralski A.
Machine Dynamics Research
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2013
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Vol. 37, No. 3
99-105
EN
Modelling of Microelectromechanical systems (MEMS) is a field of active research. An analytical model of a MEMS device allows significantly reducing the design time because simulating such a model is much faster than Finite Element Method (FEM) simulation. The main idea presented in this paper is the analytical thermo-electric model of uncooled microbolometer. It is shown that the model gives accurate results for a wide range of geometric parameters and material properties.
12
Content available remote Finite Element Meshing of Composites with Spherical Inclusions
Farmaga I., Lobur M., Shmigelskyi P., Javorskyi N., Śpiewak P.
Machine Dynamics Research
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2011
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Vol. 35, No. 3
13-21
EN
This paper consider and compare algorithms of generation finite-element meshes for composites with spherical inclusions.
13
Content available remote Development of Algorithmic and Software Automated System for Environment
Lobur M., Farmaga I., Marikutsa U.
Machine Dynamics Research
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2011
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Vol. 35, No. 3
60-66
EN
The main difference between the developed information-measuring system and the existing is that the proposed algorithms provide high noise immunity and the probability of prompt detection chemicals in air in conditions of intense hindrance and noise.
14
Content available remote Microresonator : Mathematical Model
Sviridova T., Lobur M.
Machine Dynamics Problems
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2007
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Vol. 31, No. 3
87-91
EN
MEMS design flow should take in account every measure to include key steps involving in designing of MEMS device, but there are many variables which cannot be taken in account. Thus in this paper authors presented mathematical model of electrostatic microresonator in which mechanical and electrical parameters are used. Such model could be used during statistical analysis of electrical and mechanical parameters to obtain correlation dependences between them. This analysis allows to predict, to estimate output characterristics of the structure. In the paper main aspects of micro-electro-mechanical actuators design are presented. Equations for mechanical and electrical model are carried out.
15
Content available remote Using Petri nets in MEMS design
Lobur M., Teslyuk V., Zaharyuk R., Antonyuk V.
Machine Dynamics Problems
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2006
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Vol. 30, No. 4
29-36
EN
In this paper, usage of Petri networks in MEMS design at the system level of design is grounded and proposed. Examples of colored, time and networks with priorities for MEMS with many sensors, actuators and single processor are proposed.
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