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    Wyświetlanie 1-4 z 4
    Tytuł:
    Vibration analysis of Kenyir Dam power station structure using a real scale 3D model
    Autorzy:
    Arbain, Azizi
    Ahmad Mazlan, Ahmad Zhafran
    Zawawi, Mohd Hafiz
    Mohd Radzi, Mohd Rashid
    Powiązania:
    https://bibliotekanauki.pl/articles/396138.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    Kenyir Dam power
    vibration analysis
    dam structures
    using 3D model
    Frequency Response Function
    Finite Element Method
    moc Kenyir Dam
    analiza drgań
    konstrukcja zapory
    model 3D
    FRF
    MES
    Opis:
    In this paper, the vibration analysis in terms of modal and harmonic responses are investigated for the power station structure of Kenyir Dam in Terengganu, Malaysia. Modal analysis is carried out to provide the dynamic characteristics of the power station which includes the natural frequencies and mode shapes. Meanwhile, the harmonic response analysis is performed by applying the force to the structure to obtain the Frequency Response Function (FRF) in certain range of frequencies. A real scale threedimensional (3D) model of the Kenyir Dam power station is constructed using Solid Works software and imported to ANSYS software for the Finite Element (FE) analysis. A proper boundary condition is taken into consideration to demonstrate the real behaviour of the power station structure. From the results, six most significant natural frequencies and mode shapes including the FRF in all three axes are selected. The highest natural frequency value occurred at 5.4 Hz with the maximum deflection of 0.90361 m in the z axis direction. This value is important in order to verify whether the structure can overcome the resonance phenomenon from the external disturbance forces in the future.
    Źródło:
    Civil and Environmental Engineering Reports; 2019, 29, 3; 48-59
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Attenuation of Humming-Type Noise and Vibration in Vehicle HVAC System Using a Tuneable Dynamic Vibration Absorber
    Autorzy:
    Aziz, Muhammad Safwan Abdul
    Mazlan, Ahmad Zhafran Ahmad
    Satar, Mohd Hafiz Abdul
    Paiman, Muhammad Abdul Rahman
    Ghapar, Mohd Zukhairi Abd
    Powiązania:
    https://bibliotekanauki.pl/articles/31339994.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    HVAC
    humming noise
    vibration attenuation
    AC pipe
    TDVA
    Opis:
    Heating, ventilation, air conditioning (HVAC) is one of crucial system in a vehicle. Unfortunately, its performance can be affected by the vibration of HVAC components, which subsequently produced unwanted noises. This paper presents an innovative design solution which called as tuneable dynamic vibration absorber (TDVA) to reduce the humming-type noise and vibration in the HVAC system. A detail investigation is carried by developing a lab-scale HVAC model that has the capability to imitate the real HVAC operation in a vehicle. An alternated air-condition (AC) with a fixed blower speed is implied in the study. The analysis of humming-type noise and vibration induced from the HVAC components are performed, and the TDVA is designed and tuned according to the natural frequency of the AC pipe before the attachment. The humming-type noise and vibration characteristics of the HVAC components are compared before and after the implementation of the TDVA. The findings shown that the HVAC model data compares well with the vehicle data, whereby the implementation of TDVA is found to reduce the vibration of the AC pipe by 79% and 61% in both idle and operating conditions and this subsequently improved the humming-type noise of the HVAC system. It also been observed that the TDVA has an effective frequency range around 75–255 Hz and 100–500 Hz for the HVAC model and vehicle systems, respectively.
    Źródło:
    Archives of Acoustics; 2022, 47, 3; 331-342
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Validation of the HVAC Humming-type Noise and Vibration in Model and Vehicle System Levels
    Autorzy:
    Satar, Mohd Hafiz Abdul
    Mazlan, Ahmad Zhafran Ahmad
    Hamdan, Muhd Hidayat
    Isa, Mohd Syazwan Md
    Paiman, Muhd Abdul Rahman
    Ghapar, Mohd Zukhairi Abd
    Powiązania:
    https://bibliotekanauki.pl/articles/1953462.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    humming noise
    HVAC system
    vibration
    compressor
    AC pipe
    Opis:
    The presence of noises in the vehicle cabin is an annoyance phenomenon which is significantly affected by the heating, ventilation, and air conditioning (HVAC) system. There are very limited studies reported on the specific type of noise characterisation and validation for both model and vehicle system levels. The present study developed a model of HVAC system that reflects the operation as in real vehicle, and the investigation of the HVAC components were carried out individually to determine which component contributes to the humming-type noise and vibration. The study was conducted under two conditions; idle speed of engine (850 rpm) and operating condition (850-1400 rpm). A ixed blower speed and full-face setting were applied throughout the experimental process. Three different sensors were used for the experiment, which are: accelerometer, tachometer, and microphone. From the results, the compressor and AC pipe components have contributed the most in generating the noise and vibration for both the model and vehicle systems. The findings also highlight that the humming-type noise and vibration were produced in the same operating frequency of 300-400 Hz and 100-300 Hz for idle and operating conditions, respectively, and this result was validated for both model and vehicle system levels.
    Źródło:
    Archives of Acoustics; 2021, 46, 2; 375-385
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Lab-scale HVAC Hissing-type Noise and Vibration Characterization with Vehicle System Validation
    Autorzy:
    Satar, Mohd Hafiz Abdul
    Mazlan, Ahmad Zhafran Ahmad
    Hamdan, Muhd Hidayat
    Isa, Mohd Syazwan Md
    Paiman, Muhd Abdul Rahman
    Ghapar, Mohd Zukhairi Abd
    Powiązania:
    https://bibliotekanauki.pl/articles/1953472.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    hissing noise
    HVAC system
    vibration
    evaporator
    thermal expansion valve
    Opis:
    Heating, ventilation and air conditional (HVAC) system provides a cold ventilation for the comfort of the driver and passengers in a vehicle. However, the vibration induced by the HVAC contributes to a reasonable level of noise emission, and hissing is one of the critical noises. So far, the characterization of hissing noise from the vehicle is least to be reported compared to other type of noises. Hence, this paper investigates the occurrence of hissing noise from several HVAC components. A lab-scale HVAC system was developed to imitate the real-time operations of the vehicle HVAC system. Two engine conditions, namely as ambient and operating conditions, were tested at speed of 850 rpm and 850-1400 rpm, with the blower speed maintained constantly at one level. The result shows that the hissing noise from the labscale HVAC was produced at frequency range of 4000-6000 Hz. The finding also highlights that the main component contributors of noise emission are an evaporator and a thermal expansion valve. The validation with a real vehicle system showed a good consensus whereby the hissing noise was produced at the similar operating frequency ranges. Also, the hissing noise was found to be louder when in an operating condition which could be taken into consideration by the vehicle manufacturers to improve the HVAC design.
    Źródło:
    Archives of Acoustics; 2021, 46, 2; 365-373
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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