Hazry Desa
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Hazry Desa
Official Name
Desa, Hazry
Alternative Name
Desa, H.
Hazry, Desa
Desa, Hazy
Hazry, D.
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Scopus Author ID
16642497100

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  • Publication
    Effects of variable arm length on uav control systems
    ( 2020-01-01)
    Rizon M.
    ;
    Ang C.K.
    ;
    Solihin M.I.
    ;
    Zuradzman Mohamad Razlan
    ;
    Hazry Desa
    ;
    Shahriman Abu Bakar
    ;
    Wan Khairunizam Wan Ahmad
    ;
    Zunaidi I.
    Quadrotor is a type of unmanned aerial vehicle that has been widely used in many applications, such as, policing, surveillance, aerial photography and agriculture. Conventionally, the control of quadrotor flight direction is accomplished by varying speeds of motors or manipulating torques. In this paper, a novel mechanism is proposed. The mechanism uses stepper motors to control the arm length for changing flight directions, while maintaining motors' speed at constant. A mathematical model has been created. The analysis results have shown that varying arm length can effectively control the moment of bending of quadrotors. Increasing the length of arms can result in the increase of the moment of bending without changing speed of motors, thus saving energies. Experimental results have shown that the new mechanism is able to carry more payloads which the motor speed can be utilized fully at 100% while the flight direction is been controlled by changing of the arm length compared to conventional flight control mechanisms.
      4  23
  • Publication
    Effect of Spraying Dispersion Using UAV Spraying System with Different Height at Paddy Field
    ( 2023)
    Hazry Desa
    ;
    Muhammad Azizi Azizan
    ;
    Nik Noriman Zulkepli
    ;
    Nurfadzillah Ishak
    ;
    Hang Teh Xi
    ;
    Siti Syuhaidah Yahya
    ;
    Aisyah Arina Mohammad Shahrazel
    ;
    Fakhrul Mukmin Mansor
    ;
    Siti Zaleha Abdul Aziz
    ;
    Abadal-Salam T. Hussain
    This study investigated the UAV spraying system height in relation to spraying uniformity and dispersion. The operating heights of the UAV spraying system at heights of 1 m, 1.5 m, and 2 m from the hollow cone nozzles were investigated within a wind speed of 2.8 m/s. The tests were to determine the spray uniformity and dispersion on the water sensitive paper that was placed on the paddy plant. The results of water droplet samples were evaluated using ImageJ software. The results show the droplet distribution at 1.5 m height has high values for average droplet density, which is 162.7 deposits/cm²at the top area and 161.8 deposits/cm²at the bottom area. The percentage of coverage was also high, at 55.21% at the top area and 51.4% at the bottom area.
      1  25