Browsing by Author "Tariq, Muhammad"

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    Gear misalignment diagnosis using statistical features of vibration and airborne sound spectrums
    (Elsevier, 2019-05-31) Khan, Muhammad Ali; Shahid, Muhammad Atayyab; Ahmed, Syed Adil; Khan, Sohaib Zia; Khan, Kamran Ahmed; Ali, Syed Asad; Tariq, Muhammad
    Failure in gears, transmission shafts and drivetrains is very critical in machineries such as aircrafts and helicopters. Real time condition monitoring of these components, using predictive maintenance techniques is hence a proactive task. For effective power transmission and maximum service life, gears are required to remain in prefect alignment but this task is just beyond the bounds of possibility. These components are flexible, thus even if perfect alignment is achieved, random dynamic forces can cause shafts to bend causing gear misalignments. This paper investigates the change in energy levels and statistical parameters including Kurtosis and Skewness of gear mesh vibration and airborne sound signals when subjected to lateral and angular shaft misalignments. Novel regression models are proposed after validation that can be used to predict the degree and type of shaft misalignment, provided the relative change in signal RMS from an aligned condition to any misaligned condition is known.
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    Response of Gaussian-modulated guided wave in aluminum: An analytical, numerical, and experimental study
    (SAGE Publications (UK and US), 2016-11-28) Khan, Sohaib Z.; Khan, Muhammad A.; Tariq, Muhammad; Khan, Kamran Ahmed; Khan, Tariq M.; Ali, Taha
    The application of guided-wave ultrasonic testing in structural health monitoring has been widely accepted. Comprehensive experimental works have been performed in the past but their validation with possible analytical and numerical solutions still requires serious efforts. In this paper, behavior and detection of the Gaussian-modulated sinusoidal guided-wave pulse traveling in an aluminum plate are presented. An analytical solution is derived for sensing guided wave at a given distance from the actuator. This solution can predict the primary wave modes separately. Numerical analysis is also carried out in COMSOL® Multiphysics software. An experimental setup comprising piezoelectric transducers is used for the validation. Comparison of experimental results with those obtained from analytical and numerical solutions shows close agreement.