Project

# Title Team Members TA Documents Sponsor
65 Self Cleaning Locker
Chilo Llamas
Immanuel Fernando
Nithin Nathan
William Zhang design_document1.pdf
design_document2.docx
final_paper1.pdf
other1.pdf
presentation1.pdf
proposal1.pdf
TEAM MEMBERS
Chilo Llamas: [cllamas2; campus], Immanuel Fernando: [ijf2; campus], Nithin Nathan: [nnatha3; campus]

# PROBLEM
In this time of COVID, sanitation is everything. We must make sure ourselves and our belongings are clean in order to help mitigate the spread of COVID. Especially with more companies, buildings, restaurants, and gyms opening up, its easier for the disease to spread. Especially in gyms, people are constantly sharing lockers with their sweaty belongings and clothes, which can easily spread germs.

# SOLUTION OVERVIEW
We propose a self cleaning locker. When the locker detects that nothing is in the locker, it will automatically disinfect the inside of the locker using a disinfectant spray, and then and LED display out the outside will display that the locker is clean and ready to use for the next person.

# SOLUTION COMPONENTS
## Sanitizing Subsystem
We would attach a spray that sprays disinfectant when it senses that the locker is empty. This would be implemented using a pressure sensor to detect if there are things inside the locker. Once there is nothing detected inside the locker, and the locker is closed, then a motor will automatically spray disinfectant throughout the locker.

## LED Display
The LED display will be used to show whether or not the disinfecting process was been initiated, will will display either "Clean" or "In Use". This will communicate with our sanitation subsystem using a PCB that communicates throughout our whole locker / project.

# CRITERION FOR SUCCESS
We want to make sure that when the locker detects that it is empty, it will be able to sanitize the inside of the locker. If there are items within the locker, we don't want our spray to accidentally trigger, making the user's belongings wet / damp.

Control System and User Interface for Hydraulic Bike

Iain Brearton

Featured Project

Parker-Hannifin, a fluid power systems company, hosts an annual competition for the design of a chainless bicycle. A MechSE senior design team of mechanical engineers have created a hydraulic circuit with electromechanical valves, but need a control system, user interface, and electrical power for their system. The user would be able to choose between several operating modes (fluid paths), listed at the end.

My solution to this problem is a custom-designed control system and user interface. Based on sensor feedback and user inputs, the system would change operating modes (fluid paths). Additionally, the system could be improved to suggest the best operating mode by implementing a PI or PID controller. The system would not change modes without user interaction due to safety - previous years' bicycles have gone faster than 20mph.

Previous approaches to this problem have usually not included an electrical engineer. As a result, several teams have historically used commercially-available systems such as Parker's IQAN system (link below) or discrete logic due to a lack of technical knowledge (link below). Apart from these two examples, very little public documentation exists on the electrical control systems used by previous competitors, but I believe that designing a control system and user interface from scratch will be a unique and new approach to controlling the hydraulic system.

I am aiming for a 1-person team as there are 6 MechSE counterparts. I emailed Professor Carney on 10/3/14 and he thought the general concept was acceptable.

Operating modes, simplified:

Direct drive (rider's pedaling power goes directly to hydraulic motor)

Coasting (no power input, motor input and output "shorted")

Charge accumulators (store energy in expanding rubber balloons)

Discharge accumulators (use stored energy to supply power to motor)

Regenerative braking (use motor energy to charge accumulators)

Download Competition Specs: https://uofi.box.com/shared/static/gst4s78tcdmfnwpjmf9hkvuzlu8jf771.pdf

Team using IQAN system (top right corner): https://engineering.purdue.edu/ABE/InfoFor/CurrentStudents/SeniorProjects/2012/GeskeLamneckSparenbergEtAl

Team using discrete logic (page 19): http://deepblue.lib.umich.edu/bitstream/handle/2027.42/86206/ME450?sequence=1