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NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE

P11221. NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE. Chris Morehouse: Team Leader Julie Maier: Resonator Lead Ted Zachwieja: ANC Lead Caroline Bills: Lead Engineer Prof. Edward Hanzlik: Team Guide Dr. Alan Nye: Customer Mr. Jagdish Tandon: Graduate TA.

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NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE

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  1. P11221 NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE Chris Morehouse: Team Leader Julie Maier: Resonator Lead Ted Zachwieja: ANC Lead Caroline Bills: Lead Engineer Prof. Edward Hanzlik: Team Guide Dr. Alan Nye: Customer Mr. Jagdish Tandon: Graduate TA

  2. Understand phenomenon of sound Design sound attenuation system(s) Maintain engine performance Project Overview

  3. CUSTOMER NEEDS

  4. ENGINEERING SPECIFICATIONS

  5. ABSORPTION MUFFLER Design Options • HELMHOLTZ RESONATOR • CONCENTRIC TUBE RESONATOR • ACTIVE NOISE CANCELLATION

  6. RESONATOR DEMONSTRATION MODULE • Study of resonators • Variable cavity lengths (both) • 2 outer pipe options (Concentric Tube only) • CONCENTRIC TUBE RESONATOR • HELMHOLTZ RESONATOR

  7. Concentric Tube: Vary Frequency Vary Length Waveform Helmholtz: Vary frequency Waveform CONCENTRIC TUBE RESONATOR TONE GENERATOR (LAPTOP) SPEAKERS SOUND LEVEL METER RESONATOR TESTING

  8. Predicted: Max at ½ λ ~ 20 to 30 dBA Result: Max 6 dB Offset Reduction at ½ λ > ¼ λ SCT similar results SCT less reduction than LCT for most CONCENTRIC TUBE FIXED FREQUENCY TEST RESULTS

  9. CONCENTRIC TUBE FIXED LENGTH TEST RESULTS • Predicted: • Max at ½ λ • Less at ½ λ multiples • ~ 20 to 30 dBA • Result: • Offset from λ multiples • Max ~ 10 dBA (550 Hz) • SCT similar results • SCT less reduction

  10. HELMHOLTZ RESONATOR FIXED FREQUENCY TEST RESULTS • Prediction: • Modest reduction (at least 10 dBA) • Narrow Frequency Range • Result: • Reduction offset • Achieved expected level

  11. WAVEFORM TESTING RESULTS

  12. CONCENTRIC TUBE RESONATOR RESULTS • Optimal = 26 cm • Overall ~ 9.6 dBA

  13. HELMHOLTZ RESONATOR RESULTS • No clear optimal • Overall reduction ~ 0 dBA • Behavior of resonator – narrow frequency band • Possibly array

  14. Absorption Muffler:overview • Outer steel casing • Perforated inner steel pipe • 5 shapes • Steel end caps • Packing material in cavity • 3 materials • 3 densities

  15. Absorption Muffler:material & density options • Fiberglass & Mineral Wool: • 175, 200, and 225 g/L • Steel Wool: • Grades 0000, 1, and 4 • Fiberglass • Mineral Wool • Steel Wool

  16. Absorption Muffler Testing • Test 1: Optimal Packing Material & Density • Standard Shape Option only • Test 2: Optimal Shape • Optimal Material & Density only

  17. Optimal material Results

  18. Optimal shape Results

  19. Active Noise Cancellation Additive property of sound Noise cancellation

  20. Dipole Box

  21. Feed forward Control

  22. Project Evaluation • Overall = success • Very good knowledge gain • Good start for follow-on projects • SAE Recommendations • Steel Wool packed muffler • Concentric Tube Resonator • Resonator Demo • Resonator behaved as expected • Waveforms testing success • Absorption • Steel wool better material • Geometry needs further testing • ImagineRIT • Successful • Lots of positive feedback • Back pressure testing • Inconclusive

  23. RECOMMENDATIONS • Resonators • Variable length for testing on ICE • Array of Helmholtz resonators • Optimize concentric tube for Formula SAE • Nature of Offset • Absorption • Composite Material layering • Continue Steel Wool Density Testing • ANC • Complete working system (demo) • Apply to B&S Engine • Develop Feedback system • Develop prediction models for all • Design Back Pressure testing system • Engine Mounted w/ Engine Loaded

  24. Questions?? • References: • Bell, Lewis H. Industrial noise control: Fundamentals and Applications. New York : M. Dekker, 1982. Print. • http://students.sae.org/competitions/formulaseries/rules/2011fsaerules.pdf • http://focus.ti.com.cn/cn/lit/an/spra042/spra042.pdf • ANC patent on EDGE website

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