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Mitchell Aerospace and Engineering Mitchell Community College April 22, 2012

Full Mission Simulation Report. Mitchell Aerospace and Engineering Mitchell Community College April 22, 2012. Outline of Presentation. Mission Overview. Subsystem Overview. Mechanical/Structure. Electrical/CDH. Power (EPS). Software. Action Item Summary. Conclusions. Mission Overview

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Mitchell Aerospace and Engineering Mitchell Community College April 22, 2012

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  1. Full Mission Simulation Report Mitchell Aerospace and Engineering Mitchell Community College April 22, 2012

  2. Outline of Presentation Mission Overview Subsystem Overview Mechanical/Structure Electrical/CDH Power (EPS) Software Action Item Summary Conclusions

  3. Mission Overview Erin Wilson

  4. Mission Overview Goal 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.

  5. Mission 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.  

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

  7. Testing 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.

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

  9. Testing 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.

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

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

  12. Testing 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.

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

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

  15. Mechanical/Structure Gary Staggers

  16. Mechanical/Structure Transducer 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.

  17. Mechanical/Structure Structural Integration: • Integration went as planned once the predicted errors (EM Pendulum) were addressed. • Integration is defined in Autodesk Inventor.

  18. Mechanical/Structure Bristol assembly Development of standoffs for Arduino mounts

  19. Mechanical/Structure Boring holes for EM Pendulum

  20. Mechanical/Structure Bottom plate assembly ready for second plate.

  21. Mechanical/Structure Second plate mounted waiting for Aubade.

  22. Mechanical/Structure Attaching EM Pendulum’s Pendulum on top plate.

  23. Mechanical/Structure Top down view.

  24. Mechanical/Structure Side view.

  25. Mechanical/Structure Side view.

  26. Mechanical/Structure Side view with wiring.

  27. Mechanical/Structure Side view.

  28. Mechanical/Structure Action 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.

  29. Mechanical/Structure Weight 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.

  30. Mechanical/Structure Ballast: At this time Ballast will not be used.

  31. Mechanical/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.

  32. Mechanical/Structure Integration 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.

  33. Mechanical/Structure Integration Action Items: Full integration action report by LRR.

  34. Mechanical Testing Updates John Benfield

  35. Mechanical Testing EM Pendulum/Jerk Interaction: • As predicted, themagnetic 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.

  36. Mechanical TestingEM Pendulum/Jerk Interaction Test   0.5 inches 45 degree Deflection 1 inch 35 degree Deflection  2.5 inches 15 degree Deflection 3.5 inches 0 degree Deflection

  37. Mechanical 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.

  38. Mechanical 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.

  39. Mechanical Testing Shake Table Original: • 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.

  40. Electrical/CDH Dylan Stobbe

  41. Electrical/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.

  42. Electrical/CDH Electronics • One proto-board broke in-half during integration.

  43. Electrical/CDH Electronics • 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.

  44. Electrical/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.

  45. Electrical/CDH Electronics 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.

  46. Electrical/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.

  47. Electrical/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.

  48. Electrical/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.

  49. Electrical/CDH Action 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.

  50. Power (EPS) Nathan Keller

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