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Minnesota Sound Wreckers Preliminary Design Review

Minnesota Sound Wreckers Preliminary Design Review. University of Minnesota Alexander Richman Jacob Schultz Justine Topel Will Thorson 10/26/11. Mission Overview. Justine Topel. Mission Overview.

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Minnesota Sound Wreckers Preliminary Design Review

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  1. Minnesota Sound WreckersPreliminary Design Review University of Minnesota Alexander Richman Jacob Schultz Justine Topel Will Thorson 10/26/11

  2. Mission Overview Justine Topel

  3. Mission Overview • Our mission is to design a system that actively removes noise in a test chamber during a rocket launch • We require at least some reduction in intensity of noise in the test chamber compared to the control chamber as well as the safe operation of the entire payload.

  4. Mission Overview cont. • We expect to show that this technique is a viable solution to noise sensitive testing onboard rockets. • This would benefit any sound sensitive experiment onboard a rocket including any testing in which live subjects are used and it is desired to lower their stress levels.

  5. Theory and Concepts • The theory of active noise cancellation is that when one sound wave meets another wave which is an inverse of itself the two waves cancel out and overall noise is reduced • While no research has been done onboard rockets to our knowledge, active noise cancellation has successfully been used in many other aplications.

  6. Concept of Operations • Data collection will begin upon the signal line going hot. • We expect to see limited noise reduction during initial burns and maximum reduction after the completion of both burns and through reentry.

  7. Example ConOps Altitude Apogee t ≈ 2.8 min Altitude: ≈115 km End of Orion Burn t ≈ 0.6 min Altitude: 52 km t ≈ 5.5 min Chute Deploys -All systems on -Data collection running t = 0 min t ≈ 15 min Splash Down

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

  9. System Overview Alex Richman

  10. Subsystem Design – Physical Model ANC System Power Supply Data Logger

  11. Design in Canister

  12. Critical Interfaces • At the PDR level you should at minimum identify these interfaces

  13. System Level Block Diagram Data Logger Power Supply microphone microphone speaker DSP System Wallops activation signal

  14. Requirement Verification

  15. RockSat-C 2012 User’s Guide Compliance • Our estimated structure weight including canisters is 9.4 lbs. which is under the maximum weight we expected. • Our predicted CG is .05 in above the geometric center. This does not account for the electrical components.

  16. Subsystem DesignActive Noise Cancellation Subsystem Alex Richman and Will Thorson

  17. ANC: Block Diagram Experimental Chamber Control Systems Power Supply Speaker Mic Power amplifier Mic Preamps Out Speaker Data Logger In Mic DSP Dummy Chamber

  18. ANC: Trade Studies • The following trade study shows the differences between the Pyle Pro PMHMS20 Omni-Directional Microphone and the Dayton Audio EMM-6 Electret Measurement Microphone. As of now, we will go with the EMM-6, subject to further testing.

  19. ANC: Trade Studies • The following trade study shows the differences between the Dayton ND90-8 3-1/2" Aluminum Cone Full-Range Driver 8 Ohm and the Tang Band W3-881SJ 3" Cast Frame Neodymium Driver. Currently, the W3-881SJ looks to be a better choice, but we are interested in the aluminum cone of the ND90-8.

  20. ANC: Trade Studies • This trade study shows the overview of DSP versus a prebuilt IC designed to cancel noise. As we are in the preliminary stages of the ANC design, we are not sure which solution will be more robust at the time being. We hope to discover quickly when prototyping gets underway.

  21. ANC: Risk Matrix ANC.RSK.1: microphone fails in flight causing the amplifier to stop sending cancellation sound ANC.RSK.2: the speaker creates a positive feedback and breaks itself, causing a mission failure ANC.RSK.3: the launch is delayed and our data requires more memory than initially predicted, much more memory available ANC.RSK.4: The launch is delayed by an hour putting a strain on the power budget

  22. Prototyping Plan Will Thorson

  23. Prototyping Plan • What will you build/test between now and CDR to mitigate risk? Risk/Concern Action Concern about the efficiency and ability to cancel noise in the chamber Test our hypothesized noise cancellation in mock ups. DSP

  24. Project Management Plan Jacob Schultz

  25. Organizational Chart • Our sponsor is the Minnesota Space Grant Consortium Project Manager Jacob Schultz System Engineer Will Thorson Faculty Advisor Ted Higman Safety Engineer Justine Topel Faculty Advisory William Garrard Sponsor MSGC Testing Lead Alexander Richman Structure Jacob Schultz Justine Topel ANC/ Electrical Will Thorson Alexander Richman

  26. Schedule

  27. Budget

  28. WBS Structure Electrical • Obtain electronics dimensions from electrical team • Perform test calculations on the structure design • Make any alterations necessary to keep design safe • Prototype and test ANC system • Finalize list of required electronics • Finalize Power supply system

  29. Conclusion • Before CDR we plan to • Prototype the ANC system • Finalized CAD drawings and build details • Contact machine shop about construction of parts • Perform calculations testing the structure under G loads.

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