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    Wyświetlanie 1-6 z 6
    Tytuł:
    Deagglomeration and Coagulation of Particles in Liquid Metal Under Ultrasonic Treatment
    Autorzy:
    Kudryashova, Olga
    Vorozhtsov, Alexander
    Danilov, Pavel
    Powiązania:
    https://bibliotekanauki.pl/articles/176746.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    acoustic field
    ultrasonic processing
    metal melt
    nanoparticles
    acoustic coagulation
    cavitation
    acoustic deagglomeration
    Opis:
    Ultrasonic processing in the cavitation mode is used to produce the composite materials based on the metal matrix and reinforcing particles of micro- and nano-sizes. In such a case, the deagglomeration of aggregates and the uniform distribution of particles are the expected effects. Although the particles can not only fragment in the acoustic field, they also can coagulate, coarsen and precipitate. In this paper, a theoretical study of processes of deagglomeration and coagulation of particles in the liquid metal under ultrasonic treatment is made. The influence of various parameters of ultrasound and dispersion medium on the dynamics of particles in the acoustic field is considered on the basis of the proposed mathematical model. The criterion of leading process (coagulation or deagglomeration) has been proposed. The calculated results are compared with the experimental ones known from the scientific literature.
    Źródło:
    Archives of Acoustics; 2019, 44, 3; 543-549
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The possibility of application the acoustic emission method for monitoring flow of water within a ball valve
    Autorzy:
    Dudzik, K.
    Ziegler, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/245518.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    acoustic emission
    AE
    diagnostic
    ball valve
    cavitation
    Opis:
    Acoustic emission method (AE) can be used for the diagnosis of machine parts or apparatus such as, for example, ball valves. This paper presents the methodology and research results of ball valve in fresh water systems. The opening angle of the valve was changed during the research. The flow of water was measured by a magnetically inductive flowmeter. The research was carried out on a laboratory test stand using an acoustic emission set made by Vallen Inc. This set included: 4 channel signal recorder AMSY 6, two measurement modules ASIP-2/S, preamplifier with a frequency range 20 kHz – 1 MHz and the strengthening of 34 dB and AE signal measurement sensor type VS 150M, with a frequency range 100 – 450kHz. The obtained from the AE-System made by Vallen were compared with the results of the AE-System made by Physical Acoustics (PAC). The PAC system includes preamplifier USB AE Node, type 1283 with bandpass 20 kHz – 1 MHz, AE-Sensor R6D, computer with AE Win for USB Version E5.32 software. During the study, the acoustic emission (AE) generated by flowing water was recorded. The following parameters were determined: amplitude, number of events – hits, the effective value of the signal (RMS). Analysis of the results showed that within a specific range of opening angle of the valve the value of the generated acoustic emission in flowing water increases. This is probably associated with the occurrence of cavitation within the valve. This is an undesirable phenomenon and that these opening angles of ball valve should be avoided in the normal operation.
    Źródło:
    Journal of KONES; 2016, 23, 4; 87-92
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Diagnostic of Cavitation Flow in the Centrifugal Pump Under Various Impeller Speeds Based on Acoustic Analysis Method
    Autorzy:
    Al-Obaidi, Ahmed Ramadhan
    Powiązania:
    https://bibliotekanauki.pl/articles/31339870.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    experimental analysis
    impeller speed
    cavitation
    acoustic signals
    Opis:
    Condition monitoring in a centrifugal pump is a significant field of study in industry. The acoustic method offers a robust approach to detect cavitations in different pumps. As a result, an acoustic-based technique is used in this experiment to predict cavitation. By using an acoustic technique, detailed information on outcomes can be obtained for cavitation detection under a variety of conditions. In addition, various features are used in this work to analyze signals in the time domain using the acoustic technique. A signal in the frequency domain is also investigated using the fast Fourier method. This method has shown to be an effective tool for predicting future events. In addition, this experimental investigation attempts to establish a good correlation between noise characteristics and cavitation detection in a pump by using an acoustic approach. Likewise, it aims to find a good method for estimating cavitation levels in a pump based on comparing and evaluating different systems.
    Źródło:
    Archives of Acoustics; 2023, 48, 3; 159-170
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Investigation of the Effect of Suction Valve Opening on the Performance and Detection of Cavitation in the Centrifugal Pump Based on Acoustic Analysis Technique
    Autorzy:
    Al-Obaidi, Ahmed Ramadhan
    Powiązania:
    https://bibliotekanauki.pl/articles/176672.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    centrifugal pump
    cavitation
    suction valve opening
    acoustic analysis technique
    Opis:
    The pump performance and occurrence of cavitation directly depends on different operating conditions. To cover a wide range of operation conditions for detecting cavitation in this work, investigations on the effect of various suction valve openings on cavitation in the pump were carried out. In order to analyse various levels of cavitation in different operation conditions, the effect of the decrease in the inlet suction pressure of the centrifugal pump by controlling the inlet suction valve opening was investigated using this experimental setup. Hence, the acoustic and pressure signals under different inlet valve openings and different flow rates, namely, 103, 200, 302 l/min were collected for this purpose. A detailed analysis of the results obtained from the acoustic signal was carried out to predict cavitation in the pump under different operating conditions. Also, the acoustic signal was investigated in time domain through the use of the same statistical features. The FFT technique was used to analyse the acoustic signal in the frequency domain. In addition, in this work an attempt was made to find a relationship between the cavitation and noise characteristics using the acoustic technique for identifying cavitation within a pump.
    Źródło:
    Archives of Acoustics; 2019, 44, 1; 59-69
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Comparative Investigations to Evaluate Cavitation Conditions within a Centrifugal Pump Based on Vibration and Acoustic Analyses Techniques
    Autorzy:
    Al-Obaidi, Ahmed Ramadhan
    Powiązania:
    https://bibliotekanauki.pl/articles/177056.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    centrifugal pump
    cavitation
    Fast Fourier Transform
    vibration
    acoustic
    normalise features
    Opis:
    Cavitation is an essential problem that occurs in all kinds of pumps. This cavitation contributes highly towards the deterioration in the performance of the pump. In industrial applications, it is very vital to detect and decrease the effect of the cavitation in pumps. Using different techniques to analysis and diagnose cavitation leads to increase in the reliability of cavitation detection. The use of various techniques such as vibration and acoustic analyses can provide a more robust detection of cavitation within the pump. In this work therefore, focus is put on detecting and diagnosing the cavitation phenomenon within a centrifugal pump using vibration and acoustic techniques. The results obtained from vibration and acoustic signals in time and frequency domains were analysed in order to achieve better understanding regarding detection of cavitation within a pump. The effect of different operating conditions related to the cavitation was investigated in this work using different statistical features in time domain analysis (TDA). Moreover, Fast Fourier Transform (FFT) technique for frequency domain analysis (FDA) was also applied. Furthermore, the comparison and evaluation system among different techniques to find an adequate technique incorporating for accuracy and to increase the reliability of detection and diagnosing different levels of cavitation within a centrifugal pump were also investigated.
    Źródło:
    Archives of Acoustics; 2020, 45, 3; 541-556
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of acoustic emission generated by cavitation in insulating oils
    Badanie emisji akustycznej generowanej zjawiskiem kawitacji w olejach izolacyjnych
    Autorzy:
    Zmarzły, D.
    Szmechta, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/151184.pdf
    Data publikacji:
    2008
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    emisja akustyczna
    oleje izolacyjne
    kawitacja
    acoustic emission
    insulating oils
    cavitation
    Opis:
    The main aim of this article is the investigation of acoustic emission signals generated by acoustically induced cavitation in oils. The possibility of using the cavitation phenomenon as a principle of a diagnostic tool for monitoring the condition of insulating oils in power transformers is proposed. In this note, the principles of the measurements method are explained, the built and used experimental apparatus is described and representative results of the experimental data taken from the apparatus are shown. The experimental results are presented in form of power spectral densities of acquired acoustic emission signals. An attempt to approximate the relationship between the power spectral density and the oxidation time of the mineral oil according to the PN-EN 61125 norm was executed.
    Podstawą niniejszego artykułu jest badanie sygnałów emisji akustycznej generowanych podczas zjawiska wymuszonej kawitacji akustycznej w olejach. Zaproponowano możliwość wykorzystania zjawiska do diagnostyki właściwości starzeniowych olejów izolacyjnych. Przedstawiono schemat wykorzystywanego układu pomiarowego oraz uzyskane wyniki w postaci widm gęstości mocy sygnału emisji akustycznej dla różnych wartości amplitud sygnału źródłowego. Ponadto dokonano aproksymacji zależności gęstości widmowej mocy wybranych wartości częstotliwości sygnału w funkcji czasu starzenia mineralnego oleju izolacyjnego.
    Źródło:
    Pomiary Automatyka Kontrola; 2008, R. 54, nr 2, 2; 64-66
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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