P13673: Triathlon Shoe
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Concept Development

Table of Contents

Early Concept Development

The development of design concepts for the triathlon shoes started with the creation of the functional decomposition. Using the functions defined in the composition, methods for achieving each function could be developed.

For each of the important design functions the team brainstormed five possible solutions. The important design functions included the following:

Using the possible solutions for each function, five full concepts were developed. These concepts were then evaluated in a Pugh Chart to determine the top three concepts.

These three concepts were then developed further to come up with more feasible designs. These designs are detailed below:

Concept 1: Full Length Pedal

Advantages

Disadvantages

Stack up

Stack up

Carbon Fiber Pedal with pedal side of clip

Carbon Fiber Pedal with pedal side of clip

Forefoot plate with shoe side of clip

Forefoot plate with shoe side of clip

Concept 2: Lengthwise Insert

Advantages

Disadvantages

Side view - Cross section of sole unit

Side view - Cross section of sole unit

Side view - Cross section of sole unit

Side view - Cross section of sole unit

Side view - Cross section of sole unit

Side view - Cross section of sole unit

Concept 3: Mini-Clip

Advantages

Disadvantages

Side view - Cross section of sole unit

Side view - Cross section of sole unit

Top View of pedal with cross section of clip

Top View of pedal with cross section of clip

These three concepts were then evaluated using the following comparison table to determine the strongest design concepts.

Comparison

Criteria Benchmark Concept 1 Concept 2 Concept 3

RUNNING

Flexible

Sole Comfort

Biomechanically Sound

Cycling

Clip Securely

Rigid

Minimize Dampening

Pedal Float

Transition

Easy clip in

Easy clip out

Speed

---- (15) ----

5

5

5

---- (19) ----

5

5

5

4

---- (10) ----

3

5

2

---- (12) ----

4

3

5

---- (16) ----

4

5

3

4

---- (14) ----

4

5

5

---- (14) ----

5

4

5

---- (13) ----

3

3

2

5

---- (11) ----

3

5

3

---- (11) ----

3

4

4

---- (17) ----

4

4

4

5

---- (14) ----

4

5

5

Final Concept Selection

These three concepts were taken into the System Design review to be critiqued and analyzed by our meeting attendees. During the system design review the weakest concept, the lengthwise insert, was eliminated due to the lack of design feasibility. It was decided that the other two concepts would be tested for feasibility.

However, the feasibility testing did not show any significant advantages for either of the two concepts. This led us to determine the most feasible concept by discussion of the unknowns and risks inherent in each design. After discussing, it was determined that the full length pedal was the most developed design with the least design unknowns and risks. It is intrinsically simple, with few details that can go wrong. It should also provide a less expensive shoe, important because they only last 6-12 months. On the running segment, in is almost identical to a normal running shoe and is almost guaranteed to perform as such. On the bike, the completely rigid sole matches current cycling shoes. Therefore, the detailed design will proceed with the full length pedal design.

Selected Concept

Selected Concept