Embedded Files
Requirements
Requirements
The objective of this project is to create a mini sculpture by combining the skills of all members of our team. This project involves physical building, 3D modeling, coding, and communication of our results.
Requirements:
1 sensor
1 servomotor
1 human interface
1 NXT
The motor must be controlled automatically and should run based on the measurements from the sensor that is installed within our sculpture. Also, the human interface (like a button or a knob) should interrupt the automatic operation of the motor.
Design Process
Design Process
Initial Concept Generation
Human Interface: Button that releases ramp
Automation: Sensor measures ball speed, motor moves basket based on ball speed
Potential Risks: Time sensitive
Human Interface: Button that manually adjusts ramp steepness
Automation: Move upper part of loop if ball is not fast enough
Potential Risks: reliability, repeatibility questionable
Human Interface: ball drop at the beginning of the track
Automation: moving basket to catch ball based on velocity and speed
Potential Risks: basket didn't move fast enough
Human Interface: Button that presets the cart's height
Automation: Light/sonar sensor detects height of ball, cart moves depending on the coefficient of restitution
Potential Risks: Trampolines are unreliable and position sensitive, difficult to sense the ball's height
Pugh Chart
Criteria:
Fabrication process - How easy is the design to build?
Complexity - Is it too complex?
Risk
Works? - Would our design work in theory, or is it not realistic?
WM2D process - Is our design easy to replicate in Working Model 2D?
Coding process - Are the sensors and processes easy to code?
Prototyping
A crucial aspect of an engineer's design process is prototyping. Seeing as our trampoline and hinge ramp scored the highest in our Pugh chart, we started with those.
Trampoline design:
no reliable/effective way to detect the ball's height
time between sensor measurement and cart moving to certain height too long
Hinge ramp design:
simple to fabricate
least amount of risks associated with the design
Analysis & Results
Analysis & Results
Human Interface - Button that moves ramp up/down
Automation - Sensor measures speed of ball then moves ramp based on speed so that the ball always lands in the basket
Potential Risks - Hinge malfunction, motor isn't fast enough to adjust to the speed of the ball
Flow Chart
Flow Chart
Working Model 2D Simulations
Working Model 2D Simulations
ballvid3.aviLow Speed Ball Drop
ballvid2.aviModerate Speed Ball Drop
ballvid1.aviHigh Speed Ball Drop
Final Sculpture
IMG_6395.MOVPage updated
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