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Testing

The testing for the deployment system was completed January  - February 2023. The tests that were completed were a strength test, deployment test, and a payload protection test. 

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The strength test was composed of dropping the deployment system from the roof of Discovery Hall at Central Washington University. The test was then completed again after cooling the deployment to roughly 60 degrees Fahrenheit to ensure the deployment system will be able to withstand the forces of launch and descent of the rocket without a temperature constraint. 

After successfully completing the strength test (with no damage) the payload replica was placed inside the deployment system. The same test was completed with a miniature parachute. After a satisfactory result the actual payload was inserted and the drop test was completed. The payload was then examined for wire damage, lose wires, and physical payload damage. 

In testing the strength of the deployment system there was multiple tests conducted to ensure the nose cone capable of being pushed off without being dependent on the terrain. The tests conducted were deploying the deployment system in low grass, tall grass, and thick foliage. 

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Once completed, the score sheets and a complete definition of each test will be listed below.

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Sheer Pin Test

     4F     

pi(D)^2

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Calculated Pin Shear Stress: 18414 lbs/in^2

Nylon Sheer Strength: 9600 lbs/in^2

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4-40 Nylon Pin Sheer Strength: 50 lbs - 76 lbs

              x2: 100 lbs - 152 lbs

Linear Actuator Force: 175lb

Trials 

Trial 1: Successful

Trial 2: Successful 

Trial 3: Successful 

Figure T1: Post and Pre Test Shear Pin

Figure T3: Deployment System Activation with Shear Pins

Ejection Test

Calculated force on the nose cone: 

      Energy density of  black powder:

                 3x10^3 J     = u

                       g

      Total energy/Thermal work

                 Q = E = mg c (T2 - T1)

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       Ideal Gas Law

                  PV=nRT

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        Final equation: 

                 mg   U   P1             = Fg

                h   c   D   T1

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                   Fg = 3086 N

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Required Strength of screws 3500 N

 

 

Trials

Trial 1: Fail

Trail 2: Successful

Trial 3: Successful 

Trial 4: Successful

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Forces on Deployment System 

The deployment system had to withstand the forces from the launch and landing of the rocket. 

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In analysis Force Equations: 

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F = m(v/t) 

    = 29.3 lb (52 feet / 1 sec)

    = 1,524.38 lb ft/s

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Trials 

Trial 1: Successful

Trial 2: Successful 

Trial 3: Successful 

Trial 4: Successful

ground.NEF
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Wire Management

Wiring was very compact and intricate leading to multiple connections becoming under during deployment. Leading to the following tests.

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To test to the wire management the deployment system was activated and where any wiring came undone the wires were re-secured or redesigns were reconsidered

Trials:

Trial 1: Fail

Trail 2: Success

Trial 3: Fail

Trial 4: Fail - Electronics Housing created

Trial 5: Success

Trial 6: Success

Trial 7: Success

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