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Noise Control for Internal Combustion Engine Exhaust

Noise Control for Internal Combustion Engine Exhaust. Brad Fiedler Chris VanWagenen. Greg Wodzicki Kyle Desrosiers. Design Review – Week 5. Agenda. Introduction / Background Understanding the Problem and Current Technology Courses of Action Course of Action Comparison

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Noise Control for Internal Combustion Engine Exhaust

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  1. Noise Control for Internal Combustion Engine Exhaust Brad Fiedler Chris VanWagenen Greg Wodzicki Kyle Desrosiers Design Review – Week 5

  2. Agenda • Introduction / Background • Understanding the Problem and Current Technology • Courses of Action • Course of Action Comparison • Best Courses of Action • Closing • Questions

  3. Introduction/Background Background Customer Needs Design Objectives Risk Assessment Gantt Chart

  4. FSAE Formula One Vehicle What year Vehicle is this?

  5. Problem Background • FSAE rules dictate engine noise under 110dB. • Current Passive Noise Control device (Glass pack) holds engine sound from wide range above and below 110dB • Current technology is not tuned for optimal noise reduction or engine performance Noise Engine Glass pack Exhaust >110dB Introduction / Background

  6. Design Objectives Utilize Active / Passive Noise Cancellation Technology to: • Maintain engine output under FSAE limit of 110dB. • Adhere to all FSAE Rules • To not add significant weight to vehicle • Maintain/Improve engine performance • Lower Vehicle Center of Gravity Noise Engine Active / Passive Noise Cancellation Exhaust <110dB Introduction / Background

  7. Performance Objective Possible Performance Effects of Different Exhaust Technology: • A – No Exhaust Tuning • B – Traditional Exhaust Length Tuning • C – Possible Active Noise Cancellation Improvement* * Dependent on cancellation method Introduction / Background

  8. Risk Assesment xxxxxxxxxx: • xxxxxx Introduction / Background

  9. Project Plan xxxxxxxxxx: • xxxxxx Introduction / Background

  10. Understanding the Problem and Current Technology Internal Combustion Engine ICE Exhaust Acoustics Tuning a Exhaust Understanding ANC Lawnmower Engine Glass Pack Muffler Turbo Muffler Baffle Muffler

  11. Understanding the 4 Stroke ICE Noise Exhaust Engine Understanding the Problem and Current Technology

  12. Understanding Optimal Acoustics Exhaust Stage Noise Exhaust Pressure From Combustion Vacuum Noise Top Dead Center Pressure From Vacuum Understanding the Problem and Current Technology

  13. Calculating Tuned Exhaust Length Noise Exhaust Engine • = Crankshaft Speed in RPM • = Constant Understanding the Problem and Current Technology

  14. Understanding Active Noise Cancellation - 1 • Superposition • Harmonics Understanding the Problem and Current Technology

  15. Understanding Active Noise Cancellation - 2 Noise Speakers Engine Exhaust + Signal Equations: Noise Reduction: + + Understanding the Problem and Current Technology

  16. Glass Pack • Exhaust Travels through Pipe with Perforated Holes • Sound Insulation Absorbs Sound • Minimal Back Pressure • Least Effective in Reducing Sound Noise Engine Glass pack Exhaust Inner Pipe Housing Sound Insulation Understanding the Problem and Current Technology

  17. Turbo Muffler • No Baffles • Exhaust Forced to turn back and forth • Increases Exhaust Length • Increased Back Pressure with each turn • Sound Insulation Absorbs Sound • Moderately Effective in Reducing Sound Noise Engine Turbo Muffler Exhaust Understanding the Problem and Current Technology

  18. Baffle Muffler • Reflects Exhaust Throughout Chamber • Reflections Cancel each other • Most Back Pressure created • Greatest Sound Reduction Noise Engine Baffle Muffler Exhaust Understanding the Problem and Current Technology

  19. Lawnmower Engine xxxxxxxxxx: • xxxxxx Introduction / Background

  20. Courses of Action Noise Reduction Techniques Explored Signal Processing for ANC

  21. Internal ANC with Microphone and Feedback Speaker Noise Engine Exhaust Speaker Signal <110dB Controller Primary Microphone Feedback Microphone Courses of Action

  22. Exhaust in Speaker Chamber Primary Microphone Engine Noise Exhaust <110dB Speaker Speaker Signal Feedback Microphone Controller

  23. Multiple Speaker with Error Microphone Speakers Noise Engine Exhaust Speaker Signal <110dB Controller Primary Microphone Feedback Microphone Courses of Action

  24. Signal Generation:Digital Signal Processing Courses of Action

  25. Filtering Technique 1:Filtered-X Least Mean Squared Filter Courses of Action

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