COCOON
COCOON
An exercise on traditional manufacturing processes
MAGNIGYING GLASS
An exercise on traditional manufacturing processes
MAGNIGYING GLASS
Tinkerer, Engineer, Designer
Cricket Bot​
A jumping robot
ME 112: Mechanical Systems Design
(Winter 2019)
Student Team
Healey Montague-Alamin, Chloe Tai, Eleni Alexandraki, Michaela Szabo, Vivian Xi,Nefeli Ioannou
The Challenge
Design a robot that can jump as high as possible when told to do so!
PERFORMANCE ESTIMATES
Average Motor Operating Power:
8.53 Watts
Overall System Efficiency:
10.09%
VERSION 1
Mass: 226 g
Jump height: 0.76 m
k-value: 1.26 lbf/in
Voltage: 3.7V
VERSION 2
Mass: 353 g
Jump height: 1.78 m
k-value: 12.55 lbf/in
Voltage: 11.1V
Heat dissipated
Battery
11.1 V
chemical energy converted
to electrical energy
Heat dissipated
Motor
Peak Efficiency: 54%
electrical energy converted
to mechanical energy
Frictional torque and
transmission losses
Internal resistance
Transmission
Total Energy: 3.4 J
speed and torque
conversion
Springs
Total k = 12.55
store elastic potential energy
Spring in non-elastic region
Linkages
5 - inch length
store elastic potential energy in springs
Friction losses in gears and joints Thermal dissipation
Jump
1.78 m jump
kinetic energy converted to
potential energy (mgh)
Internal collisions, Air resistance,
Jumping deformation,
Vibration
Release
We maximized the jump height in three ways
​
1
We stored more energy
in the springs by using higher k values and longer linkages to maximize spring displacement
2
We reduced friction
1) at the linkages by using plastic bushings
2) in the release mechanism by wrapping components with slippery tape
3
We increased jump efficiency by
1) using lightweight materials
2) reducing the size and mass of the base
3) positioning the heavy motor and batteries on the top of the robot