On Tuesday, March twenty ninth we visited the St. Agatha College in Milton, visiting two sixth grade courses. In a single room was Teddi (who ran our affiliated Genetics Afterschool Program final yr) and myself, while within the different room have been our two work research Gabby and Zandria.
Immediately’s subject was engineering and the design course of. Throughout our introduction, after we requested about expertise that engineers want, two very fascinating solutions got here up. First – college students stated that engineers want confidence (this was my first time listening to this reply!) – an awesome reply (very fascinating article on Engineering confidence / imposter syndrome right here). Moreover, a scholar stated “security” – and this can be a enormous deal in engineering, security practices and requirements. Each lab on NEU’s campus has required security requirements and there’s a complete regulatory company of the federal government devoted to security – OSHA. Plus – “security engineer” is an precise profession path itself.
After wanting on the Engineering Design Course of (after roleplaying the way to design a greater alarm – we got here up with a mattress that launches you out of it), college students turned civil engineers and designed and constructed paper towers to be as tall as doable. Some unbelievable designs – actually, we had two tremendous tall towers – a 32 inch tower (seen right here) and a 27 inch tower – the 2 tallest towers I’ve seen in not less than 2 years.
Subsequent – college students turned environmental engineers – and designed and constructed wind generators. Utilizing a testing set-up, college students have been tasked with designing wind turbine blades to elevate a weight as quick as doable. After monitoring information in excel and calculating complete power generated, we found a pair issues. First, brief rotor arms have been one of the best. Our testing set-up requires a connection level between the central hub and the turbine blade itself, in contrast to actual turbine blades that are linked on to the central hub of the turbine. The designs with shorter rotor arms in our case labored higher as a result of concentrated wind being generated by our slender fan, which – with longer rotor arms, moved the precise pushing floor of the turbine blades past the sides of the wind.
As well as, our testing setup had a fair symmetrical hub, that means 4 bladed designs have been one of the best, which is completely different than the true world, the place 3 bladed designs are one of the best (Why 3 Blades?). Curiously sufficient, expertise has made blade-less turbine designs that vibrate with the wind doable, that means the hazard of birds flying into spinning blades is mitigated!
The truth that shocked college students probably the most is simply how little power a wind turbine by itself generates. This has to do with a mix of the inefficiencies in fashionable wind generators (~75% environment friendly) and the truth that wind generators can truly solely completely seize 16/27 (59.3%) of the kinetic power in wind (referred to as Betz’s regulation). With 15 mph wind, a wind turbine with 1 meter blades generates 48 watts of power, much less power than a typical lightbulb requires (60 watts). Subsequently, industrial wind generators are monumental – the industry-average is blades 50 meters (164ft) lengthy! These can generate ~1.5 megawatts of electrical energy (or ~15 automobile engines). Subsequently – fashionable wind generators are arrange in wind farms – large collections of wind generators. The most important within the USA (third largest in world) is the Alta Wind Power Heart in California, working 600 generators, while the most important on the planet is the Gansu Wind Farm in China, working over 7000 generators.
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