Testing Procedures

Designed by Nghia (Wilson) Ly, Caleb Mayer, Daria Frame

Testing Performed During Construction

By the end of the building phase, two different rotation systems had been developed. The first one was pretty simple; two tubes, one being bigger than the other. The smaller tube had a hole drilled through the top and inserted into the bigger tube. The larger tube had a wide slot with a bolt through it and the hole of the smaller tube, keeping the back wheel from rotating too far. However, after the bike was put together and various people got on it to ride, we found out that this system for ration did not work, so we took those bars off the bike and developed the solution we have currently, with the caster ‘wheel’ being similar to the drive shaft at the front of the bike. This worked. Riding the bike to make sure there was rotation on the back wheel was the only kind of testing that happened during the building phase.

Testing Date

3/10-14/17

Testing Location

High School: Wrestling and Main Gym

Initial Conditions

Tests 1

• • The tester will need to be able to continuously operate the bike.

  • Bike is working and behaving as per usual, there are no factors outside of the test inhibiting the movement of the bike. The bike needs to be in top working condition.

Test 2

• • Bike needs to be in an upright position.

  • All other tests need to be done.

Test 3

• • The force pulley needs to start at 0.

  • The grip tape needs to be secured to a solid surface.

  • Each piece of tape needs to be new. Cannot have been used before.

  • Weights need to be placed on the lid, outside the experiment, so that the pulleys do not measure the force of pulley the weight and the lid on the ground.

Materials

Test 1

• • Volunteers

  • Access to open, unlittered space

  • Feedback survey

Test 2

• • Weights: at least 200Lbs

  • Area for bike to stay standing for several hours

  • Bag/contraption to hang weights on bike

Test 3

• • 2 strips of grip tape

  • 10, 20, and 50 newton spring scale

  • Plastic, storage box lid

  • Fishing line

  • 1 25Lb weight, 1 10Lb weight, and 2 2.5Lb weights

Pass/Fail Criteria

Procedures

For all, the age, weight, and biking level of the volunteer will be collected. Give warning before, these must be answered. No names are needed, however.

Test 1

Focus: Maneuverability of the front steering, rear fork and ‘caster’ pivot point subsystems.

Design Specifications: Performance. Comfort.

• 1. Information about EDD and the bike are provided, along with the idea behind the bike relating to a RipStik.

  2. A demonstration is given as to how to properly ride the bike, along with side commentary about the motion and how to achieve it.

  3. Volunteers get on the bike and try to ride it. Each time, advice and tips are provided to try and get them operating the bike as well as possible. Each volunteer can spend as much time as needed, within the class period, to get a hang of the bike.

  4. Testers then complete the corresponding feedback form. This is where their age, weight and height are provided.

Test 2

Focus: Weight capabilities of the ‘caster’ pivot point, rear fork and frame structure.

Design Specifications: Performance. Durability.

• 1. Bike is placed in an upright, stable position.

  2. The distance between the bottom edge of the footrests and the floor is measured.

  3. Weights are hung from the bike at the seat. This can be done using bags and/or fishing wire.

  4. Leave the bike like this for several hours and take periodic measurements of how far the footrests are from the floor.

  5. At the end of the time, all of the weights are taken off and the distance between the footrests and the floor are measured and recorded.

Test 3

Focus: Traction of the grip tape used on the footrests.

Design Specifications: Performance. Durability. Safety.

• 1. The plastic box lid is placed on the ground, with the curved edges facing up.

  2. Two pieces of grip tape are placed vertically from the weight also resting on the lid, about an inch apart from each other.

  3. A string is attached to the weight.

  4. The other side to of the string needs to be attached to a spring scale.

  5. The force needed to pull the weight across the smooth plastic surface is measured and recorded. This only happens once for each weight.

  6. Pull the other end of the force pulley, horizontally. Determine and record the amount of force it takes to start the movement of the weight across the grip tape. Repeat each 10 times and find the average.

     1. If the test fails, two other grip tapes will go through the same test. From this, a better material can be determined.

  7. Each weight is also pulled, at the end, on the grip tape, without the lid held down. This is testing if the tape can stop the whole system.

Safety Considerations

Because of the required motion to move the bike, crashing or falling at high speeds is not a worry, however accidents can still happen, so it will be required of the volunteers that they be able to touch a foot to the ground so that they can stop the bike if need be.

Data

Quantitative data will be found in the third test in finding how much force it takes to move various weights on the grip tape. These numbers will go down to 0.01. The rest of the data is qualitative. The testers will fill out our premade feedback surveys about both of the tests they participated in. Conclusions will be drawn from their feedback, and they will provide age, weight and height, to the best of their ability.