JumpDrive - C1 12' Results

1. Summary of Results

Expected results were obtained on channel two at 3000RPM but was not repeatable at 2000RPMs and the previous results were seen on channel one. It was found the platform has considerable wobble.

2. Introduction

The C0 test apparatus was modified, now called C1, to include supports for the axle that are on the outside, as shown in figure one and two.

Figure 1: Rendered C1 (also shows wind shields and motors which were not done)

Figure 2: Shows the actual C1

See Initial Results for a description of the variable types.

3. Baseline Results

These results correspond to step 3 in the description and are run with the following static variables:

Gyro diameter: 12"
Angle: Horizontal
~10lbs on Channel Two

Note: This was chosen because when channel two measures that force, a 3000RPM gyro is off it's rest and can provide an easy baseline.

Raw Data: "C1 - B_10_0_00.txt" (Contained in "Baseline Raw Data.zip")

4. Primary Results

The primary results consist of altering one variable at a time and each time, two separate measurements are taken.

For all the primary results, the following static variables apply:

Gyro rotation speed: 3000RPM and 2000RPM
Gyro diameter: 12"
Angle: Horizontal
Main platform rotation speed is such that when channel one is precessing, 10lbs is the target for channel two (which is not spinning) and when channel two is precessing, the target for channel one is 4lbs. These targets are per the 10lbs baseline.
In the screen shots below, the pale blue, green, and red are the primary results, and the yellow (channel two), purple (channel one) and white are the baseline results measured in step 3 above.

Gyro Variable, Channel One Gyro 3000RPM - G_1_0_00

Note: This channel contains the gyro which was balanced.

Raw Data Filename - "C1 - G_1_0_00.txt" (Contained in "Raw Data for Gyro Variable.zip")

Gyro Variable, Channel One Gyro 2000RPM - G_1_0_01

Note: This channel contains the gyro which was balanced.

Raw Data: "C1 - G_1_0_01.txt" (Contained in "Raw Data for Gyro Variable.zip")

Gyro Variable, Channel Two Gyro 3000RPM - G_2_0_00

Raw Data: "C1 - G_2_0_00.txt" (Contained in "Raw Data for Gyro Variable.zip")

Gyro Variable, Channel Two Gyro 2000RPM - G_2_0_01

Raw Data: "C1 - G_2_0_01.txt" (Contained in "Raw Data for Gyro Variable.zip")

5. Analysis

G_2_0_00 clearly shows that when the second channel (blue line) is compared to the baseline (yellow) there is a difference even while the first channel (green) is showing the same force as the baseline (purple).

However there are still problems, take G_2_0_01 for example, it shows that compared to the Sensotec load cell, the lebow load cell can take significant force difference before measuring the difference (hysteresis), especially at forces around 2 to 5 lbs. It is believed that bad hysteresis is the cause of inverse results.

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