Mitchell Aerospace and Engineering Mitchell Community CollegeApril 22, 2012

Full Mission Simulation Report

Mission OverviewMission Overview

Subsystem OverviewSubsystem Overview

Mechanical/StructureMechanical/Structure

Electrical/CDHElectrical/CDH

Power (EPS)Power (EPS)

Outline of Presentation Outline of Presentation

SoftwareSoftware

Action Item SummaryAction Item Summary

ConclusionsConclusions

Mission OverviewErin Wilson

Mission OverviewMission OverviewGoal Statement:

Our goal is to design and implement various transducers to

passively collect energy for possible use for space based

instrumentation. We expect to harvest energy from the flight

of the rocket, solar and magnetic sources.

Mission OverviewMission Overview

Test Overview:

Full payload was tested on our shake table.  

Tests include vibration tests with frequency approaching an

estimated 1,200 Hz, sustained for up to 5 minutes.  

Testing DataTesting Data

First run of the full payload shake test. All transducers are listed except EM Pendulum.

Testing DataTesting Data

EM Pendulum testing results from the first run on the shake table. EM Pendulum consists of 4 coils of wire, each coil’s voltage runs into a separate

input on the Arduino.

Testing DataTesting Data

As expected, Aubade provides a consistent voltage over time during the shake test.

Testing DataTesting Data

Bristol’s output during shake test. Bristol tends to output on one coil after settling into a rhythm, this is most likely due

to the spherical magnet remaining to one side of the transducer.

Testing DataTesting Data

Diving Board’s response during the first run of shake table testing. Diving Board’s response is reduced from previous individual tests.

Testing DataTesting Data

Grow Hot is mounted below the battery on the payload. This is the point where the highest delta temperature will occur.

Testing DataTesting Data

Jerk’s response, like many of the transducers that focus on vibration, was reduced from the previous individual tests.

This lower response has been attributed to the higher weight and thus the higher resistance the payload has to vibration.

Testing DataTesting Data

During the second shake table test, the payload was started with the shake wheel already resting on the shake table.

Testing DataTesting Data

EM Pendulum’s response during the second shake table test.

Mechanical/Structur

eGary Staggers

Mechanical/StructureMechanical/StructureTransducer Update:

Crusher has been removed from the payload due to the fragile nature of the transducer.

Diving Board has been modified to a dual cantilever assembly to replace crusher.

Mechanical/StructureMechanical/StructureStructural Integration:

Integration went as planned once the predicted errors (EM Pendulum) were addressed.

Integration is defined in Autodesk Inventor.

Mechanical/StructureMechanical/Structure

Development of standoffs for Arduino mounts

Bristol assembly

Mechanical/StructureMechanical/Structure

Boring holes for EM Pendulum

Mechanical/StructureMechanical/Structure

Bottom plate assembly ready for second plate.

Mechanical/StructureMechanical/Structure

Second plate mounted waiting for Aubade.

Mechanical/StructureMechanical/Structure

Attaching EM Pendulum’s Pendulum on top plate.

Mechanical/StructureMechanical/Structure

Top down view.

Mechanical/StructureMechanical/Structure

Side view.

Mechanical/StructureMechanical/Structure

Side view.

Mechanical/StructureMechanical/Structure

Side view with wiring.

Mechanical/StructureMechanical/Structure

Side view.

Mechanical/StructureMechanical/StructureAction items for structures before Launch Readiness Review:

Second complete payload needs to be built.

Assembly and flight of full scale test rocket.

Further optimize based on flight results.

Final placement of each transducer.

Mechanical/StructureMechanical/StructureWeight of the Payload:

The current weight of the payload is 4.39 pounds.

The current center of gravity of our payload is: 0.64 inches in

the X coordinate, 0.183 inches in the Y coordinate and 0.126

inches in the Z coordinate.

Mechanical/StructureMechanical/StructureBallast:

At this time Ballast will not be used.

Mechanical/StructureMechanical/Structure

Integration with Partner:

Adjustments have been made to switch positions in the

canister with our partner, New Jersey.

We will now be the second position due to possible magnetic

interference from the nose cone.

Our standoffs on the top plate will thread into their female

standoffs on their bottom plate at 4.753 inches from the

bottom.

Mechanical/StructureMechanical/StructureIntegration with Partner:

New Jersey’s Weight: 2.8 pounds

New Jersey’s Center of Gravity: 2 mm x 4 mm x 9 mm (x, y,

z)

**Combined information in progress.

Mechanical/StructureMechanical/StructureIntegration Action Items:

Full integration action report by LRR.

Mechanical Testing UpdatesJohn Benfield

Mechanical TestingMechanical TestingEM Pendulum/Jerk Interaction:

As predicted, the magnetic field attraction between Jerk and

EM Pendulum is causing an attraction that interferes with EM

Pendulum.

Tests were completed to optimize EM Pendulum and dictate

the redesign to address this issue. Jerk and EM Pendulum

have to be at least 3.5 inches away to minimize interference.

Mechanical TestingMechanical TestingEM Pendulum/Jerk Interaction Test

0.5 inches45 degree Deflection

1 inch35 degree Deflection

2.5 inches15 degree Deflection

3.5 inches0 degree Deflection

Mechanical TestingMechanical TestingEM Pendulum/Jerk Interaction Deflection Test

For each 0.5 inch in distance the angle of deflection changes by 10 degrees until 2.5 inches then the deflection decreases to 5 degrees. At 3.5 inches the optimum distance is achieved.

Mechanical TestingMechanical TestingEM Pendulum/Jerk Interaction Deflection Test

From 3.5-4 inches there is minimal to no deflection between EM Pendulum and Jerk. Thus, revealing our optimum placement.

Mechanical TestingMechanical TestingShake TableOriginal:• Wheel with twenty steel studs mounted in the side at outside

diameter. • Wheel spins at 3,500 RPM.• Spring loaded ski mounted above the wheel.• Produced 1,100-1,200 hertz.

New:• Replaced metal studs with longer ones that have a nylon roller.• Setup proved to be quieter and extended the lifespan of contacting

parts.• Ski was replaced with a wheel, providing more amplitude and

smooth vibration.

Electrical/CDHDylan Stobbe

Electrical/CDHElectrical/CDH

Electronics

All electronics functioned as expected with the exception of the sensing board.

The sensing board did not receive stable power during static and shake table testing.

Electrical/CDHElectrical/CDH

Electronics

One proto-board broke in-half during integration.

Electrical/CDHElectrical/CDHElectronics

During visual inspection, the solder joints were all intact, suspect a faulty joint or wire is the culprit for unstable power.

Further testing will be conducted upon rewiring the payload to determine if the Arduino is a viable power source during flight conditions.

Electrical/CDHElectrical/CDH

Electronics Integration

All electronics minus the camera have been integrated.

Still awaiting arrival of the new camera.

Once the camera has arrived, all parts will be tested and integrated.

Electrical/CDHElectrical/CDHElectronics Activation System

Current activation system is a set of 2 wires, roughly 5 feet in length.

The first wire attaches to the positive lead of the payload battery, the second returns to the payload and connects directly to the Arduino Microcontroller.

The Arduino is the only power controller on board the payload. It will distribute power to the sensing board and OpenLog.

Electrical/CDHElectrical/CDH

Electronics Sample Data

The Arduino sampled data from all components during both static and shake table testing.

The sensing board sampled correctly after power issues were corrected.

Electrical/CDHElectrical/CDH

Retrieved Data

Data was successfully retrieved from both the Arduino and the sensing board.

Arduino data varies slightly from what was expected, however it can be explained by the added weight of testing the full payload as opposed to previous testing which only involved one transducer per test.

Electrical/CDHElectrical/CDH

Retrieved Data

The additional weight acts as a filter, lowering the peak voltages of most transducers but allows them to resonate more stably and provide a more constant voltage.

Electrical/CDHElectrical/CDHAction Items

Rewire the payload, possibly with shielded wire to prevent any interference between transducers and Arduino.

This will allow us to clean up the wiring and mitigate issues that presented themselves during testing.

The most notable of these troubles being the inability/inefficiency of disconnecting and reconnecting transducers to do individual tests.

Tests with the Arduino to sensing board power scheme need to be conducted on the shake table.

Power (EPS)Nathan Keller

Power (EPS)Power (EPS)

Battery Performance

Performance proved viable during all testing and was capable of providing over 1 hour and 18 minutes of run time before needing to be recharged.

The battery did not require recharging after the static testing, but was done anyway to be safe.

Power (EPS)Power (EPS)Battery Initial/Final Voltages

Static 78 minute test:

Begin: 8.5 volts

End: 7.8 volts

After all shake tests:

Begin: 8.5 volts

End: 8.1 volts

Power (EPS)Power (EPS)Malfunctions or Unexpected Power Draws

Besides the Arduino to sensing board power issue, all power related subsystems functioned as expected.

Power (EPS)Power (EPS)

Actions Items

Purchase additional batteries and the battery charge that interfaces with the battery model being used.

SoftwareDylan Stobbe

SoftwareSoftware

Run

Software issues were discovered during testing.

A for loop count was incorrect which produced an extra column of null data.

This issue has been fixed and testing was restarted.

SoftwareSoftware

Sampling Rates

Sampling rates were slower than expected on the Arduino.

Averaging around 60 Hz.

This is an acceptable sampling rate for our purposes and should not pose an issue moving forward.

SoftwareSoftware

Action Items

Continue building software.

Adding control commands for the camera and refining the start up/shut down procedure.

Optimization of the sampling loop to provide higher sampling rates is desirable.

Action Item Summary

Brad Hager

Action Item SummaryAction Item Summary Continue adding and debugging code.

Rewire the payload.

Proprietary more batteries and a better battery charger.

Integrate camera.

Action ItemsAction Items

Action ItemsAction Items

ConclusionsNathan Keller

Conclusion Conclusion Issues & Concerns:

We currently do not have any major issues or concerns.

The budget is thinning, but we are working on fundraising ideas to help resolve this issue.

Questions:

• When are we going to receive our canister?

Conclusion Conclusion

Closing Remarks:

At this stage of the project we have taken care of all major issues and are doubling our parts list to assure everything is covered.