III Design Specifications and Design Criteria Selections - ischrum.com

tobascothwackUrban and Civil

Nov 15, 2013 (3 years and 6 months ago)

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III DESIGN SPECIFICATIONS AND DESIGN CRITERIA SELECTIONS


3.1 Problem statement

Design an autonomous vehicle that hangs from and traverses a suspended beam detecting
sources of heat, light, and wind, and dropping a specified number of ping
-
pong balls into

a
receptacle under each source. Wheel or wheel
-
like locomotion is not allowed.


3.2 Specifications & rules


The specifications define exact dimensions and figures for the competition setup, power
supply and robot, and the rules define the format of the co
mpetition.


3.2.1 Specifications & rules for robot

3.2.1.1 Robot specifications



Constrained to maximum dimensions of 25 x 25 x 25cm for all robot positions.



An external power supply will provide 24V and up to 10 Amps to the robot.



Must be less than 10 cm a
bove the beam at all times.

3.2.1.2 Robot Rules



Prefabricated gearboxes are allowed



A switch must be located on the robot causing it to begin the traverse of the beam.



The center of mass must be below the beam.



Wheel or wheel like motion is not allowed.



60

seconds is the maximum setup time for robot mounting and ball loading.


3.2.2 Specifications and rules for beam

3.2.2.1 Beam specifications (See figure 3.2.2.1)



The surface of the beam will be rolled iron wire
-
brushed.



The beam is 1.25m off the ground wi
th a 120mm width, 55mm height, and 3.5 m length.



End plates are mounted on the beam and are 50 x 50cm Plexiglas.

3.2.2.2 Beam rules



You are not allowed to alter the beam or its surface in any way.


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3.2.3 Specifications for the sources



A heat source, a ligh
t source, and a wind source will be randomly located along the beam.



Each source will be at least 25 cm from the ends of the beam and from an adjacent source.



Each source will be mounted in a piece of 5cm diameter pipe, the end of which is placed at a
dist
ance of 10 cm from one side of the beam.



The heat source will be a hairdryer blowing hot air.



The light source will be a 25 W halogen bulb.



The wind source will be a hairdryer blowing cold air.



The hairdryers are identical and have a power of 1200 W.


3.2
.4 Specifications for the receptacles



Cylindrical receptacle are 22.5 cm in diameter, and have sides have height of 30 cm



Every receptacle is co
-
centered with each source to catch dropped ping
-
pong balls



5 cm deep sponge in them to prevent balls from boun
cing.


3.3 Competition definition

Each vehicle will be placed on the beam by a team member, and have six regulation ping
-
pong balls dropped into it. A start switch on the vehicle will then be activated. The vehicle
should travel along the beam and detect t
he presence of three randomly placed sources (heat,
light and wind) located at right side of the beam, looking from the start position. One ping
-
pong
ball should be dropped in the receptacle under the heat source, two balls in the receptacle under
the ligh
t source, and three in the receptacle under the wind source.


3.4 Design criteria



Travel time should be minimized. Maximum allowed travel time is 2 minutes.



The number of balls dropped in correct receptacles should be maximized



The vehicle should drop all

3 balls in the correct receptacle



Weight of the vehicle should be minimized.



The vehicle should be predictable in its functionality.