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Wyświetlanie 1-15 z 33
Tytuł:
Design of Band-Gap Structures from Sheet Metal
Autorzy:
Iwański, D.
Wiciak, J.
Powiązania:
https://bibliotekanauki.pl/articles/1504205.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
46.40.-f
Opis:
Two-dimensional, circular plate was taken under consideration to design a band-gap structure. The analytical model was built using the Bessel functions and at the end the numerical examples were presented using MatLab and Ansys software. Results show that it is possible to create a band-gap structure, however further verification analysis must be made to improve given solution.
Źródło:
Acta Physica Polonica A; 2011, 119, 6A; 972-976
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transformation of Nonstationary Signals into Pseudostationary Signals for the Needs of Vehicle Diagnostics
Autorzy:
Dziurdź, J.
Powiązania:
https://bibliotekanauki.pl/articles/1537406.pdf
Data publikacji:
2010-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
46.40.-f
46.80.+j
Opis:
Research concerning the development of diagnostic methods of the state of the vehicle driving systems basic elements - have been carried on for many years. Modern diagnostic systems, regardless of being technically highly advanced or small degree only, concern about assessments of basic mechanical subsystems such as toothed gears or suspension elements. The information on state changes of mechanical systems can be obtained by an analysis of changes of nonlinear effects in such systems operations. Since the nonlinearity increase accompanies the system destruction, the separation of nonlinear parts of signals creates the possibility of the increase of an accuracy, reliability and application range of diagnostic methods. Technical state diagnostics for vehicles is much more difficult than for machines operating in stationary conditions. the main excitation source is an internal combustion engine, in which a rotational speed changes from an idle running (approximately 800 rpm) to a maximum rotational speed (e.g. above 5000 rpm). Thus, an application of classic analytical methods is not possible. the only solution is the transformation of the analysed signals into the "pseudostationary" ones, by taking into account changes in the engine rotational speed. One of the methods applied now a days is resampling (adaptation change of a signal time resolution in a digital form) performed on the basis of information concerning changes in an engine rotational speed. the signal from the sensor of the engine crankshaft location was used for the above application.
Źródło:
Acta Physica Polonica A; 2010, 118, 1; 49-53
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Construction of Equivalent Models of Continuous and Discrete-Continuous Systems
Autorzy:
Kasprzyk, S.
Marczuk, R.
Powiązania:
https://bibliotekanauki.pl/articles/1490367.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
46.70.De
46.40.-f
Opis:
New models have been constructed for three physical systems. These models are characterized by a uniform and transparent mathematical description. The mathematical description belongs to the class of generalized functions, which means that all equations as well as their solutions are understood in the sense of weak topology. The elements of the set of generalized functions need not be differentiable (in the classical sense) at each point domain of the function. Analyzing of actual systems in the class of generalized functions does not require a division into subsystems, which simplifies significantly execution of all mathematical operations. As compared with the classical methods, those presented in the study allow for a much faster achievement of the goal.
Źródło:
Acta Physica Polonica A; 2012, 121, 1A; A-191-A-196
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Signals Pre-processing Algorithm in Case οf Hardware and Software Implementation οn Diagnostic Programmable Device PUD-2
Autorzy:
Dąbrowski, D.
Cioch, W.
Powiązania:
https://bibliotekanauki.pl/articles/1400077.pdf
Data publikacji:
2013-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
46.80.+j
46.40.-f
Opis:
In the paper, two-stage signal pre-processing algorithm based on the filtration is presented. The developed algorithm is dedicated for the diagnostic programmable device PUD-2. The PUD-2 is the real-time analyzer based on programmable logic devices FPGA, as well as on ARM processor. Application of FPGA programmable devices and ARM processors allows to merge advantages of hardware and software implementations. Further, analysis of digital filters parameters in case of its efficient realization on the FPGA is presented. The aim of the study is to select digital-filter parameters in such way that the available resources of FPGA are used efficiently and filter characteristics meet established criteria. In the study, low pass finite impulse response and infinite impulse response filters are compared. For the first stage of the signal pre-processing algorithm, hardware implementation of the infinite impulse response filter is proposed, contrary to the second stage, where software realization of the finite impulse response filter is suggested. Combination of hardware and software filtration algorithms allows for fast and efficient realization of signal pre-processing algorithm used in analysis carried out on the PUD-2.
Źródło:
Acta Physica Polonica A; 2013, 123, 6; 1020-1023
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Local Increase of Stress on Eigenvalues for a Simply Supported Beam
Autorzy:
Kasprzyk, S.
Marczuk, R.
Powiązania:
https://bibliotekanauki.pl/articles/1196931.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
46.70.De
46.40.-f
Opis:
Local increase of bending stress in a beam may be caused by a decrease of the cross-section (fracture) or a local increase of bending torque. The increase of stress issues from the well known interdependence between the stress, the bending torque and the sectional modulus. The work presents a derivation of differential equations for eigenfunctions in both cases. Knowing the eigenfunctions and boundary conditions we determine a system of algebraic equations for the eigenvalues that are different from the eigenvalues of the beam without local stress disturbances. Two computational models of local increase of stress were constructed: with fracture and with local increase of bending torque.
Źródło:
Acta Physica Polonica A; 2014, 125, 4A; A-169-A-173
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applicability of the Fourier Expansion Method of Separation of Variables in the Linear Discrete-Continuous Systems with Distributional Coefficients
Autorzy:
Kasprzyk, S.
Powiązania:
https://bibliotekanauki.pl/articles/1504303.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
46.70.De
46.40.-f
Opis:
The analytical examination of mechanical systems in the aspect of their vibro-isolation can be limited to the construction of a computational system. The analytical description of the adopted appropriate computational model may be executed with the help of a set of differential equations of the second order, differential equations with partial derivatives or of both types at the same time. The latest description is associated with the so-called discrete-continuous systems. It is the most convenient to analyze the vibrations of the linear discrete-continuous systems in the class of functions generalized with the Fourier method of separation of variables. Until now it was possible to execute only for a small set of parameters of the system's structure. In the work the author presents a computational model that covers all the structural parameters of the system.
Źródło:
Acta Physica Polonica A; 2011, 119, 6A; 981-985
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantitative Analysis of Phase Trajectory as the Information about Technical Condition of the Object
Autorzy:
Majkut, L.
Powiązania:
https://bibliotekanauki.pl/articles/1490328.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.Le
46.40.-f
Opis:
The paper aims to describe the potential use of phase trajectory for damage detection of structural components. The attractor of the examined trajectory is a static equilibrium point of the element being diagnosed. Two different damage indices are proposed to evaluate the severity of damage in the diagnosed component. The first one refers to distance between a point on a trajectory and the point which is the attractor of the trajectory. The other one relates to linearity of the Poincaré map. Effectiveness of the proposed method was evaluated on: a simple model with two degrees of freedom, data from the finite element method model of a cantilever beam with a crack, and experimental data for a cracked plate. With the proposed method, the damage can be quickly and effectively detected. By comparing the current trajectory with that from the previous diagnostic test, it is possible to establish if the nature of crack is either propagating or stationary.
Źródło:
Acta Physica Polonica A; 2012, 121, 1A; A-168-A-173
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal design of light commercial vehicle headlamp for pedestrian protection
Autorzy:
Yazıcı, M.
Güçlü, H.
Karen, İ.
Kandirmiş, İ.
Malkoç, S
Buyukluoğlu, Ö.
Powiązania:
https://bibliotekanauki.pl/articles/1070213.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
46.40.-f
02.70.Bf
Opis:
In this study, the headlamp of a light commercial vehicle was optimized in the way of pedestrian safety. This work aims to prevent harms to pedestrians in the urban crashes. Finite element analysis models of current headlamp and impactors representing pedestrian body forms were created. Static, modal and dynamic/explicit analyses were carried out by using existing and optimized headlamp models. Both models were in the simulations under the same boundary conditions. The results of two conditions were compared with each other. The results showed that connection regions of the headlamp have a major effect on pedestrian safety in pedestrian-vehicle collisions.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 262-265
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hand Grip-EMG Muscle Response
Autorzy:
Barański, R.
Kozupa, A.
Powiązania:
https://bibliotekanauki.pl/articles/1197533.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
46.40.-f
07.10.-h
Opis:
One of the most important factors in hand-arm system research is the information about hand grip force and pressing force on a tool handle. This article focuses on an alternative method to measure grip force. For grip force, one of the most popular solutions is a special handle with force sensors. However, when we want to use it with regular hand tool like e.g. a drill, it seems to be uncomfortable because we must interfere in handle construction. A solution proposed in this article is based on technique for evaluating and recording the electrical activity produced by muscles, electromyography (EMG). It has been assumed that EMG signal will be proportional to muscle tension responsible for palm grip. This solution have one significant advantage when comparing to special handle. It can be used with regular tool without interfering in the handle. Measurement presented in this article have been carried out with use of surface electromyography (sEMG). It is not invasive method which enables to measure EMG signal through placing stickers with electrodes directly on a skin.
Źródło:
Acta Physica Polonica A; 2014, 125, 4A; A-7-A-10
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hamiltonian Approach to Multiple Coupled Nonlinear Oscillators
Autorzy:
Durmaz, S.
Altay Demirbag, S.
Kaya, M.
Powiązania:
https://bibliotekanauki.pl/articles/1490743.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.-a
46.40.-f
Opis:
In this paper, Hamiltonian approach is extended to investigate coupled nonlinear multi-degree-of-freedom oscillatory systems. At the beginning of the study, basic principles of Hamiltonian approach are provided for multiple coupled oscillators. In the next section, the amplitude-frequency relation for the two-degree-of-freedom nonlinear mechanical systems is obtained via Hamiltonian approach. The natural frequency expression is compared to show the agreement between the present and published results. Additionally, the approximate and numerical periodic solutions are plotted.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 47-49
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Spectral Response of Hand-Arm System
Autorzy:
Barański, R.
Batko, W.
Powiązania:
https://bibliotekanauki.pl/articles/1504183.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.10.-h
46.40.-f
Opis:
Recently we have used better solution to protect hand tool operators. In spite of our good intentions there is still endanger on high level vibration. For that reason we need to improve protection constantly. One of the most important properties of hand-arm system is knowledge about spectral response. In this article we try to obtain spectral response in narrow band-pass filters in accordance with IEC 1260:1995 and ANSI S1.11-2004 standards (implemented in LabVIEW software). To measure signals we used accelerometer placed on a wrist and on a tool. Of course the vibrations are attenuated by hand (cartilage, muscular tissue) but the question was what the shape of envelope in measurement range is. Our research used measurement on two different systems. The one was based on vibration inductor (laboratory environment), the second one used drill (real environment). This research is a part of a wider project to make virtual model of hand-arm system.
Źródło:
Acta Physica Polonica A; 2011, 119, 6A; 913-915
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neural Classifiers of Vibroacoustic Signals in Implementation on Programmable Devices (FPGA) - Comparison
Autorzy:
Dąbrowski, D.
Cioch, W.
Powiązania:
https://bibliotekanauki.pl/articles/1504200.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
45.80.+r
46.40.-f
Opis:
The research includes comparative analysis of the effect of the recording of weight vectors and input data of selected neural classifiers with fixed-point numbers. Research has been conducted due to insufficient literature on the influence of such a recording on the correct classification of vibroacoustic signals by neural networks. This current issue was brought up in authors' earlier researches, concerning realization of neural classifiers on programmable logical devices field programmable gate array, with the application of fixed-point processor. During the analysis, three types of neural classifiers were compared in the tests: classifier based on neural network - length vector quantization, classifier using radial neural networks - radial basis functions, and third - counter propagation neural network. The problem stated was to recognize technical state of gear transmission DMA-1 in variable operating conditions. Vectors, based on estimates derived from processed vibroacoustic signals were used as teaching material.
Źródło:
Acta Physica Polonica A; 2011, 119, 6A; 946-949
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Searching for New Measurement Solutions in the Area οf Estimating Danger of Local Vibrations at Workplace
Autorzy:
Barański, R.
Powiązania:
https://bibliotekanauki.pl/articles/1537332.pdf
Data publikacji:
2010-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.10.-h
46.40.-f
Opis:
There is a lot of controversy when we consider the most popular method of measuring local vibrations to estimate danger on hand tools operators. This is because of commonly used adapter that represents many faults, from which the most significant are: strong impact of grip and placing adapter between a hand and a tool handle. What we propose in this article is a measurement system including a band placed on a wrist. This solution highly eliminates defects mentioned above, but seems to be too trivial to maintain high quality of measuring process. The purpose of this article is to estimate the quality of this new solution in respect of some basic categories in which measurement errors occur.
Źródło:
Acta Physica Polonica A; 2010, 118, 1; 3-6
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hardware Implementation of Artificial Neural Networks for Vibroacoustic Signals Classification
Autorzy:
Dąbrowski, D.
Jamro, E.
Cioch, W.
Powiązania:
https://bibliotekanauki.pl/articles/1537403.pdf
Data publikacji:
2010-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
45.80.+r
46.40.-f
Opis:
This paper studies the architecture of a neural classifier designed to identify technical condition of machines, based on vibroacoustic signals. The designed neural network is optimized for implementation on Field Programmable Gate Arrays (FPGA) programmable devices. FPGA allows massive parallelism and thus real-time classification as each neuron can execute arithmetic operations simultaneously. The classifier of vibroacoustic signals was designed and tested for the self - organized neural network. The teaching vectors are based on estimates derived from processed vibroacoustic signals generated by rotary machines. The created classifier was applied for recognizing technical state of demonstrative toothed gear DMA1 in variable operating conditions.
Źródło:
Acta Physica Polonica A; 2010, 118, 1; 41-44
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Concept of a System for Identification of the Dangerous Areas for People with Visual Dysfunction
Autorzy:
Wiciak, J.
Borkowski, B.
Powiązania:
https://bibliotekanauki.pl/articles/1504188.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.20.-q
46.40.-f
Opis:
The article presents the concept of a system for identification of dangerous areas in the urban area targeted at the people with visual dysfunction. The idea of the system is presented comprising the attempt of application of the wireless data transmission: IR - infra-red; BLUETOOTH; RFID. The consideration comprises also the identification of the object (human), identification of the movement direction (double barrier), wireless data transmission with data on the given dangerous area, excitation of the vibration information and the feedback of the system. Also the subject of optimal installation on the urban objects was discussed. The article is a realisation of the research task in the project called "The development of the method for marking of the dangerous areas and especially important places in urban area for visually impaired people with use of the wave-vibration markers".
Źródło:
Acta Physica Polonica A; 2011, 119, 6A; 921-924
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 33

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