Conference Publications
Permanent URI for this collection
Browse
Recent Submissions
1 - 5 of 73
-
PublicationPCB Rogowski coil sensor by using saw blade pattern for arcing fault detection(IOP Publishing, 2023)Rogowski is a special current transformer and has been categorised as a low-power stand-alone current sensor. This sensor is designed by using a Saw blade pattern with 50 turns and 100 turns. This number of turns will impact the increment of the sensitivity of the sensor. Rogowski coil is used for measuring the alternating current (AC) and high-speed current pulses. The PCB Rogowski Coil will detect the arcing fault that design with AutoCAD software after that import to CST software. An arc is created when the electrical current jumps the gap between two conductive materials. The most common causes of arcs include worn contacts in electrical equipment, damage to insulation, break in a cable and loose connections. In order to reduce the arc fault risk, the arc fault interrupter (AFI) technology and arc fault detectors (AFD) have been developed. However, these devices are most suitable for domestic application or low voltage (LV). This paper proposed a simulation using AutoCAD and CST software to design a Rogowski coil and the Rogowski Coil sensor will be tested by using CST software in terms of radiation pattern. The biggest radiation pattern in red colour is the saw blade pattern in 100 turns at 2 KHz frequency, the radiation pattern covering entire sensor area compared with other radiation patterns with other frequency. The main lobe magnitude for 2 KHz frequency is 46.8 dB, main lobe direction is 180 deg, angular width is 153.4 deg and the side lobe level is zero. This is the best number of turn and frequency compared to 50 turn saw blade sensor.
-
PublicationMechanomyography: an insight to muscle physiology(Springer, 2020)The aim of this review article is to highlight an important application of mechanomyography as a tool to study muscle physiology related issues. Skeletal muscles are of vital significance in our body and contribute well towards all type of movements. Although, there are other techniques in vogue used for non-invasive assessment of muscle. But mechanomyography (MMG) do offer shear benefits for reliable muscle study. So, a substantial number of related articles were searched for this technical review from various databases including SCOPUS, PubMed, ScienceDirect, IEEE Xplore and springer link. Records were screened according to the selection criteria. The studies related to muscle physiology aspects analyzed using MMG were only selected for detailed analysis. During in depth analysis of records finally selected for this article, physiology aspects investigated via MMG were divided into seven sections including muscle stiffness, Parkinson disease, effect of dehydration, muscle contractile properties, muscle contraction mechanics, muscle temperature and muscle hypertrophy. The findings of this review suggest that MMG is a useful and reliable tool to investigate muscle physiology and it has significant applications in sports and medicine. Muscle contractile properties can be employed for future investigation on muscle fatigue, stiffness, atrophy and even functional mechanics of muscle. This review might fill the gap in knowledge in understanding of muscle physiology using MMG.
-
PublicationSmooth and collision-free path planning for holonomic mobile robot based RRT-Connect(IOP Publishing, 2023)Robot navigation is a crucial aspect of any mobile robot system. Many path planners generate a path that is zigzag in nature and contains many sharp or angular turns. Such courses are not adequate for a mobile robot to follow as it has to slow down and then speed up at these sharp turns. Thus, the integration of the smoothing function is a vital aspect to generate smooth and continuous paths. Moreover, a collision check after path smoothing needs to be accounted for a possible collision with obstacles surrounding. Herein, a path pruning algorithm is utilized to reduce the total path waypoints. Then a piecewise cubic B-spline smoothing function is applied to ensure the path is smooth and continuous. In addition, a post-smoothing collision checking and improvement algorithm based on mid-point insertion for the collide segments is proposed. Experiments and comparisons with the geometric RRT-Connect path planner have shown that the inclusion of a path pruning algorithm, smoothing function and post-smoothing collision check generates better results with reduced path length.
-
PublicationComparative study of vibration energy harvesting on home appliances using piezoelectric energy harvester(IOP Publishing, 2023)This project was developed to harvest vibration energy using a piezoelectric energy harvester. The availability of home appliance vibration energy is a promising solution to get clean energy resources to manipulate wasted energy. When the appliances’ vibration hits the piezoelectric energy harvester surface, pressure is applied to the piezoelectric transducers and converts mechanical energy into electrical energy. The piezoelectric energy harvester’s efficiency depends on the availability of the home appliances’ vibration energy; thus, using multiple piezoelectric transducers in series generates more power. The piezoelectric’ alternating current (AC) output is fed to a Cockroft-Walton voltage multiplier (CWVM) to convert into direct current (DC) and boost the output. Four piezoelectric transducers connected in series have successfully produced a voltage of up to 4.7 V. Its output voltage can be harnessed to power low-voltage electronic devices.
-
PublicationModelling and analysis of electrical performance outdoor glass insulator under various services and lightning impulse(IOP publishing, 2023)This paper is focus on modelling of glass type insulator with voltage rating of 275 kV. The glass insulators are still widely served in overhead transmission line because of its high dielectric strength capability. However, their outdoor application has resulted in the exposure to the various service conditions such as weather, pollution and lightning conditions. Further, the inclination effect of the insulator under the nominal voltage and lightning impulse is modelling through Finite Elementary Method (FEM). Then, the model of glass insulator is constructed in three different inclination angles by using the Ansys Maxwell 3D for simulation purpose. The results show the inclined insulator due to the wind load effect has the lowest breakdown voltage at most 53.33% compared with the vertical insulator. Under the outdoor environment factors such as humid, wet and contamination, the localized electric field and current density had increased significantly. Consequently, this situation may cause the power losses, localized heating effect also reduces the electrical performance of the insulators.