Conference Publications
Permanent URI for this collection
Browse
Recent Submissions
1 - 5 of 87
-
PublicationPowering a Raspberry Pi controlled battery charger with CC-CV method(AIP Publishing, 2024-08-01)A battery charger is a device applied to provide energy to rechargeable or secondary batteries by forcing current through it. A battery is one of the best choices for devices such as cell phones, digital cameras, and laptops, and the power adapter is described as the charger. In this research, using Raspberry Pi switch mode to securely charge batteries prevents overcharging and it can be controlled and monitored all the time. To achieve this result, the constant current (CC) stage and constant voltage (CV) stage of battery charge management is thoroughly implemented to increase a battery's life and performance. The CC and CV stages are important parameters that reflect battery performance. The management of the CC and CV stages not only prevents over-or under-charge but also improves the battery life and performance score. This paper aims to manage the state of battery charging within a certain limit by using Raspberry Pi. A regional transmission organization provides a signal to the battery. The expected result of the output voltage is in the range of 5 to 12 V, a constant output current of 0.5 A, and the charging time depends on the set current and battery capacity. By using Raspberry Pi, the charging system signal is given by a switch mode, which is sent to the battery by putting bias on a battery's power output considering the state of charge (SoC) status so that the performance score and battery life improve. If charging mode continues after the battery is fully charged, it may shorten battery lifespan and cause a short circuit and explode, causing fire accidents. The novelty of this research is it is expected to be portable; can be brought anywhere if a power supply is unavailable.
-
PublicationAn experimental analysis of reposition mechanism in hospital bed using Matlab(AIP Publishing, 2024-06-18)There are several hospital bed studies related to the repositioning mechanism available in the literature but the details of characteristics such as active joints and passive joints are still lacking due to the multifunction of the mechanism. The main objective of this paper is to analyze the repositioning condition based on a parallel mechanism using Matlab programming. To overcome these issues, the development of simulation 2 RPS-1PRS parallel mechanisms is used with the variance input of roll angles 0, 15, and 30 (deg.) given. So, based on these experiments, the simulation results occur that the length of leg S1 is not changed while the length of leg S2 and S3 changes when the mechanism received the variance input of parameters. In conclusion, the simulation can highlight the details of elements of the mechanism such as active joints and passive joints of the mechanism.
-
PublicationSimulation analysis for 33 kV porcelain insulator string based on room temperature vulcanize coating(IEEE, 2023)Porcelain insulator is widely used in high voltage (HV) transmission lines due to its high mechanical strength, performing well on heat and aging resistance. However, porcelain insulator string is always exposed to environmental contamination. The presence of accumulation contamination on the porcelain insulator string surface reduces the electrical performance and causes insulation failure in transmission and distribution lines. Literature has shown that the conventional method to prevent contamination is limited to periodically water washing and silicone grease, involving some limitations in practice from the technical and economic point of view. Therefore, this research investigates the performance of porcelain insulator string due to the contamination effect based on Room Temperature Vulcanize (RTV) coating in 33 kV transmission line system. The four-unit porcelain insulator string in 2-D form was first developed using computer-aided design (CAD). Electric field and voltage distribution results were analysed using finite element method (FEM) software. After adding RTV coating, the percentage decrement of electric field distribution value is 9.73% from the study. This has proven that the porcelain insulator string with a significantly lower electric field distribution may protect the transmission lines from a higher risk of corona or even flashover.
-
PublicationThe impact of cavity size on electric field distribution and PD inception voltage in epoxy-resin insulation(IEEE, 2023)Cavities in insulation systems of active high voltage (HV) equipment affect their performance, reliability and useful life periods. Cavities serve as flash points for enhanced field activity leading to ageing from partial discharge (PD) events and subsequent breakdown of the insulation material. In this paper, the impact of cavity diameter on the electric field distribution as well as on PD inception voltage are investigated in an Epoxy-resin insulation sample. A 3D adequate model of the sample with a spherical cavity was created and simulated in COMSOL for different cavity sizes and applied voltage stresses respectively. The simulation results indicate that both field distribution and the PD inception voltages are strongly influenced by cavity size as well as the applied voltage magnitude. The electric field intensity was observed to be higher in cavities with smaller diameter relative to the insulation bulk, while the inception voltage decreases with increase in the cavity diameter and vice-versa.
-
PublicationSmart solar safety worker helmet using accelerometer and GPS sensor(Springer, 2023)In construction projects, safety is a big issue. There is not an effective option to overcome the situation. The safety of the public is jeopardized during the construction process. Some incidents happen when people fall from great heights and go unreported, resulting in death due to a lack of medical assistance. However, the numbers of deaths could have been prevented. This research aims to create smart wearable gadgets, such as a safety helmet that use a variety of sensors such as solar, accelerometer, and GPS sensor to improve worker safety. The IoT-based gadgets assist in detecting worker falls and sending notifications for emergency assistance. The system starts with solar energy charging the battery and then when the accelerometer sensor detects any falls, the notification will be sent to the Blynk. Meanwhile, GPS sensor detects the location of the worker and shows in the Blynk. As a results, the prototype has been tested in a variety of situations and proved to be extremely accurate which the improvement is almost 3.3%.