Finalizing the Design

The team set limits for components in order to prepare for narrowing the options of components in an attempt to finalize the design. Below is what the team established:

=

where,

1. Tires
2. Length of frame
3. Double barrel lever disk brakes
4. Height of frame
5. Steering
6. Suspension 
7. Digger brake
8. Hitch

The Decisions that were made were made the week of the (3/18/13) were:

• Tires
• Buy
• Size: 12-16 inches (in diameter)
• Frame (length & height)
• Build frame
• 6ft. x 3.5ft. x 3ft.(L x W x H) in approximation
• Brakes
• Buy
• Double barrel lever (disk brakes)
• On all four wheels
• Steering
• Make handlebars
• Buy handlebar grips
• Front steering
• Suspension
• Buying
• Front suspension
• Digger Brake
• Make
• Hitch
• Make
• Hook to carabiner

To be determine in the Following weeks:

With certain areas of the design still in a grey area, the team will work together to fully complete the design by establishing how the suspension will work together with the steering. The steering will also be looking into, currently the idea is to create a four-bar linkage that connect from the back to the front, in order to steer from the back. Finally the team will also finalize whether the cart will have both front and back suspension or just front suspension.

Urban Mushing Cart Visits The Team

The team gathered on campus to examine the client's own mushing cart to gather information and ideas on how to improve on their design.

Google Drive

https://drive.google.com/?tab=mo&authuser=0#my-drive

PDS

Attribute	Type	Metric/Requirement	Unit	Notes
Safe	Objective	# of ways to cause bodily harm
Resilliance	Objective	Varying impact and Temp.	Force/Temp.
Low-Cost	Objective	less than $1000	Dollars
Low-Weight	Objective	less then 85lb	Pounds
User Friendly	Objective	Ease of transport
Regulate Speed	Function	Accelerate as fast as dogs/80% efficiency
Regualte Direction	Function	Change alignment within 5 secods	Time
Decrease Speed	Function	Decelerate from 30-0MPH	MPH
		Stopping must range from 50-100ft	Feet
Stabalize Driver	Function	Reaction force must be less than 2/3 of impact force	lbf
Secure Passenger	Function	Hold lateral force of 500lbf	lbf
Attach Dogs	Function	Sustain tensile forces of 250lbf/dog	lbf
Transfer Energy	Function	Transer Kinetic Energy of at least 25%
Absorb Impact	Function	absorb 60lbf of impact	lbf
Prevent Damage	Function	Components must hold 60% of yield strength

Functional Decomposition