Mohd Noor Arib Md Rejab
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Preferred name
Mohd Noor Arib Md Rejab
Official Name
Mohd Noor Arib , Md Rejab
Alternative Name
Rejab, Mohd Noor Arib
Rejab, M. N. Arib
Rejab, M. N. A.
Main Affiliation
Scopus Author ID
55982324600
Researcher ID
GDQ-2664-2022
INM-7628-2023

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  • Publication
    Suppresion of sommerfeld effect in power transmission system employing cardan shaft through phase angle arragement
    ( 2024-07-01)
    Omar M.H.
    ;
    Muhajir Ab. Rahim
    ;
    Mohd Noor Arib Md Rejab
    ;
    Rani M.N.A.
    In a power transmission system with a cardan shaft, the Sommerfeld effect occurs, which is characterized by speed capture and release at the resonance range. Suppression of the Sommerfeld effect is critical for smooth and reliable operation. This study aims to suppress the Sommerfeld effect in a transmission system by compensating the phase angle between the two universal joints installed in the cardan shaft. The differential equations of motion representing the dynamics of the system are derived using the Lagrange equation. The responses are simulated numerically using the Runge–Kutta algorithm for scenarios with constant and gradually varying input torque. To suppress the Sommerfeld effect, the phase angle is set to 25%, 50%, 75% and 100% of the maximum twist angle observed in the subcritical speed range of the in-phase configuration. With the phase angle of 25%, the Sommerfeld effect is damped, where the output speed only deviates by 5% from the estimated value for both input torque scenarios. It is shown how the change of the phase angle attenuates the Sommerfeld effect and the system vibrations, which should be considered in the development and practical implementation.
  • Publication
    NUMERICAL STUDY ON EFFECT OF PHASE ANGLE ON TORSIONAL AND LATERAL VIBRATIONS IN POWER TRANSMISSION SYSTEM EMPLOYING CARDAN SHAFT
    ( 2023-07-01)
    Omar M.H.
    ;
    Muhajir Ab. Rahim
    ;
    Mohd Noor Arib Md Rejab
    A power transmission system driven by a Cardan shaft may experience severe vibration due to fluctuating rotational speed and moments transferred to the final drives, determined by the level of angular misalignment and phasing of the joint yokes. This study investigates the potential of an out-of-phase position displaced by a phase angle in attenuating vibrations. The governing equations representing the dynamics of the system are derived. The torsional and lateral vibration responses are numerically calculated over a range of input rotational speeds. When attenuating the vibration, the phase angle is set equal to the maximum twist that occurs during the in-phase position. Relative attenuation is used to investigate the phase angle effects. The effectiveness is studied for different levels of static angular misalignment. For the considered system, the results showed that for static angular misalignment greater than 20 degrees, the proposed phase angle arrangement could attenuate torsional vibration by more than 10 percent and significantly attenuate the lateral vibration.
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