Quote:
Originally Posted by Sudesh Sahu
In Day 2 you say that parametric analysis was done. What exactly does that mean and what specifically did it include for you this year? Also, around how many hours does your team work per day during the first week?
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Hi Sudesh,
For us, parametric studies include 2 aspects:
-Standard Kinematic calculations using excel spreadsheets
-Simple 2D sketches showing geometry of systems that can be manipulated easily to show valuable information
The parametric studies essentially give us a starting point for the prototype CAD and things to look out for once built. It gives us approximate dimensions for key features, while also telling us which features we have to experiment with/optimize using our prototype.
We completed parametric studies for all of our subsystems this year.
Shooter:
-Projectile Motion spreadsheet to determine wheel rpm, launch angles, height of shooter from floor.
-2D sketches outlining ball path through the popper and shooter, showing us pinch values, and dimensions for flywheels/shooter arch etc.
Variables to be confirmed using Protoype: Shooter angles, number of wheels, RPM
Inake:
-Complete 2D sketches showing pivot point and overall geometry of the system, including roller locations, and bumper height approximations.This helped us determine the dimensions/geometry needed to defeat the cheval, portcullis, sally port, and drawbridge
-Torque calculations for determining gear ratios in order to allow the intake arm to lift our robot (mix of both 2D sketches and excel spreadsheet)
Variables to be confirmed using Prototype: Make sure geometry works + Hooks for drawbrige + durability tests in terms of strengths (we ran our intake prototype into the wall approximately 1000 times to inspect damage)
Drive:
-Kinematic spreadsheet outlining gear ratios for achieving our desired acceleration and top speed
-2D sketches showing initial drivetrain geometry going over all the defences to check for lengths, clearances, and wedge angle.
Variables to be confirmed using prototype: Center to center distance between wheels: 11" vs 10" (which we ended up choosing)
Hours of work during Prototype Week:
Kick off Saturday/Sunday: Approximately 11-12 hours per day
Monday - Tuesday (Cadding Prototype): Approximately 8 hours per day
Wednesday - Friday (Building Protoype): Approximately 5-6 hours per day
Week 1 Saturday/Sunday (Testing): Approximately 8 hours per day
Let me know if you have more questions!