Home Final Project Week 1 Week 2a Week 2b Week 3 Week 4 Week 5 Week 6 Week 7 Week 8 Week 9 Week 10 Week 11 Week 12 Week 13 Week 1: Computer Aided Design
Week 1: Computer Aided Design


1.1 Design Inspiration
The inspiration for my final project stems from the five years I have been stationed onboard U.S. Coast Guard vessels overseeing Engineering Departments. I was responsible for the maintenance and repair all propulsion, electrical distribution, and auxiliary systems. Yes, that includes everything from the 18-cylinder diesel engines that turn the propellers to every door knob, toilet seat, and light bulb. The vessels I served had been commissioned for 30 to 60 years and as you can imagine were plagued by equipment casualties. These casualties varied in significancy from inconvenient to catastrophic. For example, a failed mechanical seal on a hot water recirculation pump left the crew without hot water for several hours; this was inconvenient for bathing and sanitizing dishware, but did not affect ongoing operations. However, the failure of a mechanical seal on the main propulsion diesel engine's cooling water pump resulted in significant flooding and placed a pause on our ongoing pursuit of a vessel engaged in illicit actives. Looking back, there is some amount of irony in the fact that the failure of a $5 mechanical seal crippled a $100M vessel. I will avoid dwelling into the details of mechanical seals, but in general they maintain a seal between a rotating shaft and pump housing. Mechanical seals are wear components that should be inspected for signs of degradation and replaced as needed. But what if the circulating system didn’t have a mechanical seal? What pressures and flow rates could such a system maintain? That is the inspiration for my final project, I plan to fabricate a completely closed water circulating system, no seals, no gears, no weak points for leaks to develop. I plan to accomplish this via a screw type impeller embedded with permanent magnets that will also serve as the rotor of an induction machine. Impeller rotation will be induced by oscillating current through a series of wire coils.
This is my initial hand sketch on the system which depicts the use of permanent magnets to induce impeller rotation via a motor driven exciter disk outside of the piping system.



1.3 Takeaways