NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE
description
Transcript of NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE
![Page 1: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/1.jpg)
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
NOISE REDUCTION FOR INTERNAL
COMBUSTION ENGINE
P11221
![Page 2: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/2.jpg)
PROJECT OVERVIEW
Understand phenomenon of sound
Design sound attenuation system(s)
Maintain engine performance
![Page 3: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/3.jpg)
CUSTOMER NEEDS
![Page 4: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/4.jpg)
ENGINEERING SPECIFICATIONS
![Page 5: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/5.jpg)
DESIGN OPTIONS
ABSORPTION MUFFLER
CONCENTRIC TUBE RESONATOR
HELMHOLTZ RESONATOR
ACTIVE NOISE CANCELLATION
![Page 6: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/6.jpg)
RESONATOR DEMONSTRATION MODULE
Study of resonators Variable cavity lengths (both) 2 outer pipe options (Concentric Tube only)
HELMHOLTZ RESONATORCONCENTRIC TUBE RESONATOR
![Page 7: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/7.jpg)
RESONATOR TESTING
Concentric Tube: Vary Frequency Vary Length Waveform
Helmholtz: Vary frequency Waveform
CONCENTRIC TUBERESONATOR
TONE GENERATOR(LAPTOP)
SOUND LEVEL METER
SPEAKERS
![Page 8: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/8.jpg)
CONCENTRIC TUBE FIXED FREQUENCY TEST RESULTS
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
![Page 9: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/9.jpg)
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
![Page 10: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/10.jpg)
Prediction: Modest reduction
(at least 10 dBA) Narrow Frequency
Range
Result: Reduction offset Achieved
expected level
HELMHOLTZ RESONATOR FIXED FREQUENCY TEST RESULTS
![Page 11: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/11.jpg)
WAVEFORM TESTING RESULTS
![Page 12: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/12.jpg)
CONCENTRIC TUBE RESONATOR RESULTS
Optimal = 26 cmOverall ~ 9.6 dBA
![Page 13: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/13.jpg)
HELMHOLTZ RESONATOR RESULTS
No clear optimal Overall reduction ~ 0 dBA Behavior of resonator – narrow frequency band
Possibly array
![Page 14: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/14.jpg)
ABSORPTION MUFFLER:OVERVIEW
Outer steel casing Perforated inner steel pipe
5 shapesSteel end capsPacking material in cavity
3 materials3 densities
![Page 15: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/15.jpg)
Fiberglass
Mineral Wool
Steel Wool
Fiberglass & Mineral Wool:
175, 200, and 225 g/L
Steel Wool: Grades 0000, 1, and 4
ABSORPTION MUFFLER:MATERIAL & DENSITY OPTIONS
![Page 16: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/16.jpg)
ABSORPTION MUFFLER TESTING
Test 1: Optimal Packing Material & DensityStandard Shape Option only
Test 2: Optimal ShapeOptimal Material & Density only
![Page 17: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/17.jpg)
OPTIMAL MATERIAL RESULTS
![Page 18: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/18.jpg)
OPTIMAL SHAPE RESULTS
![Page 19: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/19.jpg)
ACTIVE NOISE CANCELLATION
Additive property of sound
Noise cancellation
![Page 20: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/20.jpg)
DIPOLE BOX
![Page 21: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/21.jpg)
FEED FORWARD CONTROL
![Page 22: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/22.jpg)
Resonator Demo Resonator behaved as
expected Waveforms testing
successAbsorption
Steel wool better material
Geometry needs further testing
ImagineRIT Successful Lots of positive
feedbackBack pressure
testing Inconclusive
Overall = success Very good knowledge
gain Good start for follow-on
projects
SAE Recommendations Steel Wool packed
muffler Concentric Tube
Resonator
PROJECT EVALUATION
![Page 23: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/23.jpg)
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 allDesign Back Pressure testing systemEngine Mounted w/ Engine Loaded
![Page 24: NOISE REDUCTION FOR INTERNAL COMBUSTION ENGINE](https://reader036.fdocuments.in/reader036/viewer/2022062422/56813af1550346895da36b32/html5/thumbnails/24.jpg)
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
QUESTIONS??