Minnesota Sound Wreckers Conceptual Design Review

1. Minnesota Sound WreckersConceptual Design Review University of Minnesota Alexander Richman Jacob Schultz Justine Topel Will Thorson 9/29/2011

2. CoDR Presentation Contents • Section 1: Mission Overview • Mission Overview • Theory and Concepts • Mission Requirements (brief, upper level) • Concept of Operations • Expected Results • Section 2: Design Overview • Design Overview • Functional Block Diagrams • Payload Layout • RockSat-C 2012 User’s Guide Compliance

3. CoDR Presentation Contents • Section 3: Management • Team Organization • Schedule • Budget • Mentors (Faculty, industry) • Section 4: Conclusions

4. Mission Overview • The purpose of this project is to develop a mechanical and electrical design for removing rocket noise that gets transferred to the test chamber. • The method to be used is active noise cancellation with mechanical isolation of the system.

5. Mission Overview • Our hypothesis is that active noise cancellation will reduce rocket engine noise by at least 90%. • It is possible that experiments done on sounding rockets will be noise sensitive and would greatly benefit from noise cancellation.

6. Mission Overview: Theory and Concepts • Noise cancellation requires some knowledge of acoustic wave propagation and also signal processing techniques. • We need to measure the signal and invert it, while amplifying our output such that we can cancel the signal but not create a larger problem. • What other research has been performed in the past? • Results?

7. Mission Overview: Mission Requirements • We want to cancel the noise and prove that our system works • We measure the input signal in the experimental chamber and process that in order to output the inverse into the same chamber • We take input data in the control chamber • Afterwards, we compare the input at the microphone of the control and experimental chambers • Minimum success criteria • Take data on input of the experimental chamber • Output a signal from the speaker in an attempt to cancel the noise • Structure maintains full integrity for the duration of the flight crestock.com

8. Expected Flight Time Altitude t ≈ 1.7 min Altitude: 95 km t ≈ 1.3 min Altitude: 75 km Apogee t ≈ 2.8 min Altitude: ≈115 km t ≈ 4.0 min Altitude: 95 km t ≈ 4.5 min Altitude: 75 km End of Orion Burn t ≈ 0.6 min Altitude: 52 km t ≈ 5.5 min Chute Deploys -All systems on -Begin data collection t = 0 min t ≈ 15 min Splash Down

9. Noise Cancellation TimeLine 2 1 3

10. Mission Overview: Expected Results • We expect to be successful reducing the overall power of the wavelength spectra between about 50Hz and 20kHz • This means a reduction in amplitude at most of the frequencies within this range. • We are planning on using a middle range speaker, and thus will maybe see more response from 1kHz to 10kHz.

11. Design Overview • We hope to use the power supply and data logger from our previous flights • We may need to put more batteries in the power supply in order to get enough amplification in the speaker • We need a microphone, speaker and DSP capable of doing all this • The microphone needs to be small and capable of taking the force of the initial launch. • Same goes for our speaker, which will hopefully be efficient enough that we can drive it fully with our power supply.

12. Functional Body Diagram Power Data

13. Example FBD – mechanical/system (rough diagram) Dummy speaker plate Control chamber Electronics- Datarecording power Test chamber Electronics – controlling sensor (mounted to plate) speaker microphones Mounts to lid of canister Mounts to base of canister

14. Design Overview: Payload Layout • The structure will contain two sealed chambers as well as an area to mount the electronics and power supply classymommy.com

15. Design Overview: RockSat-C 2012 User’s Guide Compliance • Predicted mass- we expect the electronics to weigh about 2 lbs. and the structure made out of aluminum should weigh about 10 lbs. the entire canister without balancing weights should weigh approximately 19 lbs. the last pound will be weights attached within the structure to ensure a center of gravity within the requirements • The experiment will employ use of the entire can. • All systems activate upon connection with the rocket using the rocket activation wire

16. Management • Team leader: Jacob Schultz • Aerospace Team: Jacob Schultz, Justine Topel • Electrical Team: Alexander Richman, Will Thorson • Faculty Advisors: Professor Ted Higman, ECE, University of Minnesota Professor William L. Garrard, AEM, University of Minnesota

17. Management • September-Oct 15th • Research requirements and preliminary design • Look up what components need to be purchased • Oct 15th-Nov 15th • Work final design including solid works drawings and electronics drawings • Ensure no issues with design • Nov 15th-Nov29th • Prepare CDR make sure everything checked multiple times and ready for submission

18. Conclusion • Our Mission is to employ active noise cancellation onboard a rocket • From this point we plan on looking at the exact components necessary and dimensions in order to make a more finalized design • We are going to further investigate how to implement noise cancellation best and ways to configure the electronics onboard • We are ready to start looking at subsystems and lower level designs at this point