# Title Team Members TA Documents Sponsor
43 Real-Time Sound Visualization
Lin Le
Qian Chen
Xinyue Yu
Dongwei Shi design_review
We plan to design a sound visualization model by using a pitch detector to detect pitch and output with musical notation on the screen. Furthermore, we are going to store the melody and mimic piano sound on chips.

1. Detect Pitch.

We plan to make a pitch detector in hardware to detect sound in real time at a 10k sampling rate, and a LED light to indicate when it is ON or OFF. An autocorrelation analysis, center clipping, infinite peak clipping will be used to build up the detector.

2. Output music notation in real time.

Once a note has been detected, it will show on the screen at the right position. The previous notes on the music notation will move right. It will look like flowing music. The screen will be connected on a black board with detector in which we could display the sound in real time.

3. Store the melody.

We are going to store the melody in pitch into registers for future replay.

4. Mimic instruments sound.

we will use instrument sounds package, like guitar, piano, and violin to replay the melody on arduino. The mimic will not be in real time and only for replay mode.

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:

Team using IQAN system (top right corner):

Team using discrete logic (page 19):