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Wyświetlanie 1-5 z 5
Tytuł:
Indicator of vibroacoustic energy propagation as a selection criterion of design solution
Autorzy:
Klekot, G.
Powiązania:
https://bibliotekanauki.pl/articles/176843.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
vibration damping
vibroacoustic energy propagation
Opis:
Contemporary tools which help to design technical objects refer to the conclusions drawn from studying the changes of physical processes accompanying the exploitation, especially to vibroacoustic processes. The main problem is to define such vibroacoustic measures, where their changes would model the analyzed physical phenomena in the best way. Basing on simple indicators which refer to occurring phenomena, it is possible to obtain accurate solutions with a satisfactory reliance level without using complex computing techniques needing detailed descriptors. According to the author, the indicators which are based on the analysis of vibroacoustic energy propagation are very useful in solving engineering problems. These indicators are useful while diagnosing the condition of technical systems, identifying and minimizing the vibroacoustic risks. The possibilities of using such indicators in order to find design solution are illustrated by sample results of the research of the structures with vibroacoustic elements which reduce the noise of rail vehicles by the rail vibration damping.
Źródło:
Archives of Acoustics; 2013, 38, 4; 489-494
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal Design of Piezoelectric Actuators for Shunt Damping Techniques
Autorzy:
Neubauer, M.
Powiązania:
https://bibliotekanauki.pl/articles/176597.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
piezoelectric transducer
piezoelectric shunt damping
piezoelectric energy harvesting
vibration damping
Opis:
In vibration control with piezoceramics, a high coupling of the piezoelement with the structure is desired. A high coupling improves the damping performance of passive techniques like shunt damping. The coupling can be influenced by a the material properties of the piezoceramics, but also by the placement within the structure and the size of the transducer. Detailed knowlegde about the vibration behavior of the structure is required for this. This paper presents an in-depth analysis of the optimal shape of piezoelectric elements. General results for one-dimensional, but inhomogeneos strain distribution are provided. These results are applied to the case of a longitudinal transducer and a bending bimorph. It is obtained that for maximum coupling, only a certain fracture of the volume should be made of piezoelectric material. . .
Źródło:
Archives of Acoustics; 2014, 39, 4; 615-622
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selection of sound insulating elements in hydraulic excavators based onidentification of vibroacoustic energy propagation paths
Autorzy:
Dąbrowski, Z.
Dziurdź, J.
Pakowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/177189.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
noise and vibration
propagation path
coherence function
Opis:
In spite of the fact that standardizing operations and increased awareness of hazards led to a significant improvement of vibroacoustic climate of operator’s stands of new machines, their long-term operation - often under difficult conditions - leads to a fast degradation of acoustic qualities of machines. Temporary operations performed during surveys and periodical overhauls are rarely effective, due to the lack of any guidelines. In this situation the authors propose the algorithm for selection of eventual screens or sound absorbing and sound insulating partitions, utilizing the measuring procedure aimed at identification, at the operator’s stand, of main noise components originated from various sources. On the basis of this procedure, the vibroacoustic energy propagation paths in the machine was estimated.
Źródło:
Archives of Acoustics; 2013, 38, 4; 471-478
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Modelling of a Piezo Roof Harvesting System. The Right Component Selection
Autorzy:
Leo, R. di
Viscardi, M.
Tuccinardi, F. P.
Visone, M.
Powiązania:
https://bibliotekanauki.pl/articles/139787.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
energy harvesting
rain
piezoelectric material
renewable energy
mechanical vibration
pozyskiwanie energii
deszcz
materiał piezoelektryczny
energia odnawialna
drgania mechaniczne
Opis:
The present work focuses on a first study for a piezoelectric harvesting system, finalized to the obtaining of electrical energy from the kinetic energy of rainy precipitation, a renewable energy source not really considered until now. The system, after the realization, can be collocated on the roof of an house, configuring a “Piezo Roof Harvesting System”. After presenting a state of art of the harvesting systems from environmental energy, linked to vibrations, using piezoelectric structures, and of piezoelectric harvesting systems functioning with rain, the authors propose an analysis of the fundamental features of rainy precipitations for the definition of the harvesting system. Then, four key patterns for the realization of a piezoelectric energy harvesting system are discussed and analysed, arriving to the choice of a cantilever beam scheme, in which the piezoelectric material works in 31 mode. An electro-mechanical model for the simulation of performance of the unit for the energetic conversion, composed of three blocks, is proposed. The model is used for a simulation campaign to perform the final choice of the more suitable piezoelectric unit, available on the market, which will be adopted for the realization of the “Piezo Roof Harvesting System”.
Źródło:
Archive of Mechanical Engineering; 2017, LXIV, 2; 257-282
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The transition effect in rail tracks – assessment of transient energy for low frequency vibrations
Autorzy:
Sołkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/231030.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
strefa przejściowa
efekt przejścia
modelowanie
tor kolejowy
podtorze
właściwości
analiza stanów przejściowych
metoda energii
drgania niskiej częstotliwości
transition zone
transition effect
modelling
railtrack
track foundation
characteristics
transient analysis
energy approach
low frequency vibration
Opis:
The transition effect between different track-foundation systems is examined from the point of view of energy that is produced during the passage of load. Analytical solution is given. A model of beam on elastic foundation with damping is used as the base model. It is developed into a model composed of two parts that represent the track-subgrade system with an abrupt change in mechanical parameters: bending stiffness, foundation stiffness, damping, and mass. Several calculations are carried out including examples of comparative calculations with the Finite Difference Model and the Finite Element Model. Transient rail deflections and energy are determined, which may serve to estimate the rate of track-subgrade deterioration.
Źródło:
Archives of Civil Engineering; 2014, 60, 1; 123-143
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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