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

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Presentation on theme: "Noise Control for Internal Combustion Engine Exhaust Design Review – Week 5 Greg Wodzicki Kyle Desrosiers Brad Fiedler Chris VanWagenen."— Presentation transcript:

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

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 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 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 Understanding the Problem and Current Technology

12 Understanding Optimal Acoustics Understanding the Problem and Current Technology

13 Calculating Tuned Exhaust Length 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 Understanding the Problem and Current Technology Signal Equations:Noise Reduction:

16 Glass Pack  Exhaust Travels through Pipe with Perforated Holes  Sound Insulation Absorbs Sound  Minimal Back Pressure  Least Effective in Reducing Sound 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 Understanding the Problem and Current Technology

18 Baffle Muffler  Reflects Exhaust Throughout Chamber  Reflections Cancel each other  Most Back Pressure created  Greatest Sound Reduction 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 Courses of Action

22 Exhaust in Speaker Chamber

23 Multiple Speaker with Error 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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