Abstract
The economy runs on energy and quest for development means that more energy is needed. Statistics show that the majority of energy comes from burning fossil fuels, and they pollute our environment. This work is aimed at producing a mechanical speed breaker electricity generator that operates on two actuating strokes. It converts the linear motion of the rack gear that is depressed by the vehicular movement to rotary motion of the pinion gear keyed on the shaft and alternator. The machine gets actuated by compression and release of the springs, thus increasing the output of the machine. It consists of a stable frame, dome-shaped top, rack and pinion mechanism, chain and sprocket mechanism, freewheels, springs, flywheel, shafts, an alternator and a deep cycle battery. The design was carried out using engineering principles with due consideration to cost, serviceability, ease of operation, durability and performance. It is designed to be actuated by vehicles weighing 1,600kg (400kg per wheel) and a prototype rated 100kg was built. Tests were performed to determine the performance of the machine and the results showed that the speed breaker could produce a rotary speed of 1500 rpm at the alternator, thereby generating 204W of electrical power per cycle. The machine conversion efficiency was about 88.7%.
Highlights
The fundamental principle of electricity generation was discovered in the 1820s and early 1830s by the British scientist Michael Faraday
Units W rpm rpm mm kN m m m/s N mm mm mm Parameters Load on Gear, M Acceleration Due to Gravity, g Height, h Potential Energy, PE Power, P Speed of Shaft, N Torque Transmitted to the Pinion, T Standard Module of Gear, m Parameters Pitch Diameter, Dp Number of Teeth, Tp Diameteral Pitch, Pd Addendum, aw Dedendum, dw Outside Diameter, D0 Root Diameter, d Chordal Thickness Circular Thickness Circular Pitch, Pc Clearance Pressure Angle, φ Base Diameter Working Depth Minimum Total Depth Fillet Radius Face Width, w
It was observed that vibration was within safe limits from the vehicular speed of 1 km/h to 5 km/h and the springs performed in line with the design
Summary
The fundamental principle of electricity generation was discovered in the 1820s and early 1830s by the British scientist Michael Faraday. The continuous supply of the drive needed to move this loop of wire or disc of copper lies our energy problems This drive is often generated by heat engines fuelled by chemical combustion or nuclear fission. New sources of fossil fuels keep being discovered, the rate of discovery is slow compared with exploration and the difficulty of green extraction is increasing (Institution of Mechanical Engineers, 2019). Another concern is the emissions that result from the burning of fossil fuel as they pollute our environment. The estimated carbon dioxide emission from the world's electrical power industry is 10 billion tonnes yearly (Centre for Global Development, 2007)
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