International Research Symposium of UWU-2018

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Browsing International Research Symposium of UWU-2018 by Subject "Communication Technology"

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    Haptic Teleoperated Steering System for Unmanned Ground Vehicles
    (Uva Wellassa University of Sri Lanka, 2018) Wijekoon, D.N.B.; Nandana, W.A.Rasika
    The teleoperation of Unmanned Ground Vehicle places high demands to its steering system. The main objective of this research was to design and introduce a haptic teleoperated steering system. While turning the steering wheel into desired angle, master controller detects the signal and transmit it to slave controller through wireless communication module. Then, it drives the slave motor. If there any disturbance torque on the slave motor, armature current changes proportionally to that torque. The change in armature current was sensed by a current sensor connected to the slave controller. Then, that data transmits to the master controller. After that, master controller regenerates a haptic feedback current signal and sends it to the feedback motor driver. Then, the relationship of master and the slave motor responses was obtained. Whenever the slave side feels any force, the current drawn by the slave motor was increased from its normal value. This current regenerates the proportional torque on the master side. Control scenario was evaluated with control systems applications. By the use of a PID controller allowed more precise control of position and thus, faster achievement of a stable position. The design was simulated in Simulink software and control algorithm was tested for prototype model. The system is settled within 8.4 s for the given angle inputs and disturbances. The system responded to each force acting on the slave end according to a specific program, which was coded and installed on a microcontroller. The results proved the model can generate haptic feedback on the teleoperator. Further development of enhanced performance of the system in wireless network environment is intended. Keywords: Haptic Feedback, Steer By Wire, Teleoperation, Unmanned Ground Vehicle
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    Portable Charger Powered by Piezo-electric Crystal Vibration
    (Uva Wellassa University of Sri Lanka, 2018) Weerakoon, M. W. M. N.; Amarasinghe, A.R.P.C.C.J.
    With the increment of the world population, world has faced a huge problem in terms of generating the required power necessity. Due to the rapid industrialization, the world is expecting more and more power. In present, numbers of power sources could be seen both non-renewable and renewable. However, due to increasing usage, a lot of energy resources have been exhausted and wasted. Also, there can be identified another huge problem arising when generating power that is environmental pollution. Piezo-electric material can be identified as an alternative eco-friendly method for power generation. Piezo-electric materials have the unique ability to interchange electrical and mechanical energy. Because of this property, piezo- electric plates can be used to absorb the mechanical energy and transform it into electrical energy. Usually, the ambient vibration or pressure will act as the mechanical energy source. A small amount of piezo plates is not capable of generating much energy. Therefore, methods of accumulating and storing of energy generated until sufficient power is captured were developed. The research was carried out by combining several piezo electric plates serially and parallelly with the use of rectifying filters. Small vibration motor was used as the energy source to generate vibrations. It is observed that serial combination of three plates gives sufficient voltage to charge a battery. This stored energy is intended to use. In everyday life, as it can be identified some instances, where small-scale power necessities arise. As examples mobile phone charging, lighting a table lamp, charging rechargeable batteries. As a future development, the device will be tested in real-world applications such as harness energy from human walking and vehicle vibration. Keywords: Power, Piezo-electric plate, Vibration, Energy, Charging