Analysis of Vibration and Thermal of a Modeled Circuit Board of Automated External Defibrillator (AED) Medical Device

In this research, the AED was modeled with the Ansys 2020 workbench and calibrated based on static and dynamic loading to verify the static displacement with the first set of five frequencies obtained based on the un-prestressed conditions. With modification, using the prestressed analysis, the next set of frequencies obtained gives an improved result with 0.0003 percent error difference between each frequency. The modeled Circuit board was used to examine the vibration and dynamic analysis for the rigid board. Likewise, the thermal analysis was conducted on the modeled Circuit board with the heat source as the battery and the rate of dissipation of heat around the board and its effect on the circuit components.Comment: 7 page

Numerical Study of Wind Pressure Loads on Low Rise Buildings under different Terrain

This is a numerical study of wind pressure loads on low rise buildings in which three different types of roofs were analyzed which are the flat, gable and circular roof at different wind speed. The numerical analysis was performed using FLUENT package based on values of k (turbulence kinetic energy) and (dissipation rate of turbulence) based on partial differential equation. Also, flat, and shallow escarpment terrains were considered during the simulation to determine the coefficient of pressure at different wind speed for different roof types. For the shallow escarpment terrain, a flat roof was considered at different velocities and for the flat terrain, three different types of roofs are considered which are the flat, gable and circular roof. It is observed that as the wind speed increases, the coefficient of drag decreases. It also shows the effect of vortex formed at the leeward direction of the building which implies the higher the wind speed, the larger the vortex formed and the lower the building ventilation and higher the damage on the roof of the building. Based on the analysis, it is preferable to use a circular roof based on the aerodynamic characteristics of wind around building walls and roofs

Controlled Voltage of Hot Snare Polypectomy Device in Electrosurgical Device

The study is used to understand the working procedure of the Olympus PSD-30 Electrosurgical Unit which a high-frequency alternating current is to measure the voltage and power output from the unit when used for a surgical operation to determine the extent of tissue damage. The output power and voltage were as examined with the stopwatch, then with an Arduino time based for 1, 2, and 3 seconds to understand the different modes of the cut and coagulation feedback with an RCC circuit used to mimic the human body. This shows a pattern in which the feedback power increases, and voltage decrease as the cut and coagulation mode increases. The percentage between the stopwatch and Arduino is 29% for the 1 and 2 seconds. With this information, Arduino Uno timing was used to carry out the experiment for the device for the different power settings for both the cut and coagulation mode from 2W to 50W at 5W intervals. Based on each trial, the signal was measured for a magnitude of 1Vpp, and the crest factor obtained was 1.5 with a voltage of 1.088v and 1.0519v for both the LabView and Oscilloscope respectively for the Electrosurgical Unit of 350kHz. The power control gives 0.4W, 2.04W, and 3.01W for the power peak at 1, 2, and 3 seconds for the 50W Cut mode of the Electrosurgical Device