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Wyszukujesz frazę "amplitude-frequency characteristic" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Uncertainty analysis of the determination noise source direction using the tetrahedron hydrophone array
Autorzy:
Gloza, I.
Józwiak, R.
Pawlik, P.
Bartko, W.
Powiązania:
https://bibliotekanauki.pl/articles/332612.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
tetrahedral antenna
GPS
amplitude-frequency characteristic
Opis:
The analysis of the uncertainty of the determination of the noise source direction in the aquatic environment is presented in this paper. The type A uncertainty of the bearing algorithm was determined on the bases of multiple measurements of the hydroacoustic pressure by means of the TC4032 type hydrophones and the GPS device data. The influence of the non-linearity of the amplitude-frequency characteristic on the uncertainty of the determination of the noise source direction, was also described. The influence of water density, electromagnetic disturbances and irregular noises on the final uncertainty was determined. On the bases of the determined uncertainty components the uncertainty budget, of the determination of the angle showing the direction from which hydroacoustic waves are coming, was prepared.
Źródło:
Hydroacoustics; 2015, 18; 59-68
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental research on the influence of the production quality of tooth operation surfaces of cylindrical gearwheels and torque on a gear oscillation amplitude
Autorzy:
Vasyljeva, O.
Kuzio, I.
Powiązania:
https://bibliotekanauki.pl/articles/411335.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
proving stand
oscillating processes
measuring equipment
full factorial experiment
amplitude-frequency characteristic
Opis:
For carrying out experimental research a proving stand with closed power flow was designed. For the determination of oscillation process parameters (amplitude and frequency) the devices with input signals from strain sensors were used. Planning the experimental research and mathematical treatment of the results obtained was performed with the use of a full factorial experiment. The results of the experiment allowed for obtaining a nonlinear mathematical model for determining the oscillation amplitude and the amplitudefrequency characteristic of gear box oscillations (first harmonic). It then is used for determining the harmonic of the oscillating process caused by the inaccuracy of a tooth operating profile, which influences the smoothness of gear operation. The dependences taking into account internal and external dynamic loads from oscillating processes during the calculations of teeth gear hardness were obtained.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2014, 3, 2; 79-86
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary assessment of vibration impacts generated by the public transport systems on pregnant women based on subjective reactions
Autorzy:
Kromka-Szydek, M.
Dziechciowski, Z.
Tyrpin, P.
Powiązania:
https://bibliotekanauki.pl/articles/307544.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
kobieta ciężarna
wibracje ciała
transport publiczny
środki transportu
pregnant women
whole body vibration
vibration discomfort threshold
amplitude-frequency characteristic
public transport
means of transport
Opis:
Research efforts summarised in this study were a part of preliminary investigation to evaluate the impact of pregnant women’s exposure to vibrations generated by public transport system when using. Methods: The assessment of the problem and discomfort for pregnant women, caused by the public transportation is based on a questionnaire including questions relating to the women’s subjective feelings on well-being or discomfort when exposed to vibration during the ride in passenger cars or when using means of public transport. In the second stage of investigation, vibrations transmitted onto a sitting person during the tram or car ride were measured. Results: The survey shows that when travelling on a tram the women complained mostly of digestive or neurological disorders, during the car ride they suffered most acutely from digestive disorders, sensed enhanced foetus movements and reported problems with the osteoarticular system. Amplitude-frequency characteristics of the investigated vehicle types reveal that vibration amplitudes registered during the ride in a motor vehicle are higher than on tram (in the analysed frequency range). Furthermore, vibration accelerations in the z-axis direction registered during the tram ride exceed the vibration discomfort threshold, particularly for the 1/3 octave bands 5 and 6.3 Hz. These are frequency ranges corresponding to resonance frequencies of vital organs in the abdominal cavity (4.5–10 Hz). Conclusions: Correlating these results with frequencies reported in literature associated with subjective human responses to vibration, shows that pregnant women using public transport are likely to suffer from a variety of ailments caused by vibrations generated during the ride.
Źródło:
Acta of Bioengineering and Biomechanics; 2018, 20, 1; 79-92
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free vibrations of the partially tensioned geometrically non-linear system subjected to Euler’s load
Autorzy:
Uzny, S.
Sokół, K.
Osadnik, M.
Powiązania:
https://bibliotekanauki.pl/articles/127651.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
column
Bernoulli-Euler's theory
free vibration frequency
nonlinear system
characteristic curves
amplitude of vibration
nonlinear component of free vibrations frequency
kolumna
teoria Eulera-Bernoulliego
częstotliwość drgań własnych
układ nieliniowy
krzywe charakterystyczne
amplituda drgań
nieliniowa składowa częstości drgań własnych
Opis:
In this study the fixed-fixed column subjected to axial Euler’s load has been investigated. The load is placed between the fixed ends of the structure and its location can be changed along column’s length. The boundary problem of free vibrations of the mentioned system has been formulated on the basis of Bernoulli – Euler theory and taking into account non-linear axial deformation relationship. Due to non-linear expressions the solution of the problem was done with small parameter method. In the paper the change of the first vibration frequency in relation to location and magnitude of the loading force was obtained. The relationship between natural vibration frequency and the amplitude is also discussed.
Źródło:
Vibrations in Physical Systems; 2016, 27; 399-406
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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