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P11221 - Noise Reduction for Internal Combustion Engines Faculty Advisor: Ed Hanzlik Customer: Dr. Alan Nye Team Leader: Christopher Morehouse Mechanical.

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Presentation on theme: "P11221 - Noise Reduction for Internal Combustion Engines Faculty Advisor: Ed Hanzlik Customer: Dr. Alan Nye Team Leader: Christopher Morehouse Mechanical."— Presentation transcript:

1 P11221 - Noise Reduction for Internal Combustion Engines Faculty Advisor: Ed Hanzlik Customer: Dr. Alan Nye Team Leader: Christopher Morehouse Mechanical Engineers: - Julie Maier - Caroline Bills - Ted Zachwieja

2 Agenda Problem Overview Project Objectives Customers and Users Project Flow Chart & Plan Engine Model Overview Design Options Design Feasibility Next Steps Questions & Discussions

3 Background Noise abatement - growing field Formula SAE Sound Constraints Conventional Methods Reduce Performance No RIT Background in this Field Multiple Applications Possible Customer:Dr. Nye Users:Formula SAE Team EE 2010-2 Team

4 Project Scope Investigate physics of sound generation and transmission Identify and locate major noise contributors in ICE Analyze and model noise generation of ICE Propose design for noise reduction mechanism Provide background to EE team for parallel ANC project Provide noise reduction demonstrator for Spring 2011 ImagineRIT

5 Project Deliverables Engine Sound Model ANC System Constraints Demonstrator for ImagineRIT

6 Project Overview

7 Project Breakdown

8 Detailed Project Breakdown

9 Customer Needs

10 Engineering Specifications

11 Relationship Diagram ES 1Reduce noise level ES 4Passes B10.2.1 of the SAE Formula rules ES 7Component Costs ES 12Change in Engine Max Power

12 The Plan

13

14 Risk Assessment

15

16

17 Research & Benchmarking

18 Sound is Pressure http://www.school-for- champions.com/science/noise_cancellation.htm

19 How We Measure Sound Digital Signal Processing Decibel Meters Sound Pressure Indicators

20 IC Engine Sources Pressure Waves

21 Engine Model

22 MECHANICAL DESIGN OPTIONS

23 Current Design Glass Pack Low Flow Restriction Low Noise Attenuation

24 Unpacked Concentric Tube Resonators Design #1: Single-pass Design #2: Multi-pass Passive http://www.eastsidemufflers.com/mufflers.htm

25 Design #1: Single-pass

26 Design #2: Multi-pass

27 Packed Concentric Tubes Design #3: Metal Foam Design #4: Full Length of the Exhaust System Design #5: Rock Wool and Stainless Steel Wool www.stainlessworks.net

28 Designs #3 & #4: Metal Foams www.bundesregierung.de

29 Foams Permeability Pore Size Level of Reticulation Absorption Area –Length –Curves Thickness Scott Acoustical Laboratories

30 Foams www.bundesregierung.de

31 Optimal Foam Structure Industrial Noise Control Handbook. Cheremisinoff and Cheremisinoff

32 Absorption Area Industrial Noise Control Handbook. Cheremisinoff and Cheremisinoff

33 Metal Foams Available in a variety of densities Available in a variety of pore sizes ERG Duocel Test kit en route –Aluminum –Copper –Silicon Carbide –Reticulated Vitreous Carbon (RVC)

34 ERG Duocel Metal Foams ERGaerospace.com

35 Design #5: Rock Wool A fibrous insulation made from basalt Custom Muffler and Auto Repair, LA Cone Engineering, Inc., CA MagnaFlow Exhaust

36 Rock Wool

37 Design #7: Exhaust Silencer Insert Applied to exhaust tip Reflects Sound Waves back into exhaust stream

38 Design #8: Active Single-pass

39 Design #9: Active Multi-pass

40 ELECTRICAL DESIGN OPTION

41 Design #10: Active Noise Cancellation (ANC) This generates more sound by the adding of two waves.

42 ANC continued Introducing a wave 180 degrees out of phase of the targeted noise being cancelled.

43 How ANC Applies to Cars Three Major components of sound generation occur in a car Dominating noise comes from the muffler

44 Feed Forward Control

45 Feedback Control http://focus.ti.com.cn/cn/lit/an/spra042/spra042.pdf

46 Installation Options

47 CONCEPT SELECTION

48 List of Design Options Current Glass Pack* 1.Unpacked Concentric Tube Resonator 2.Multi-pass Resonator 3.Metal Foam* 4.Entire Length of Exhaust System Wrapped 5.Lava Rock/Rockwool and Stainless Steel Wool* 6.Multiple Exhaust Pipes (Combination) 7.End Cap Silencer (Combination) 8.ANC 9.Variable Length Resonator - Single Pass 10.Variable Length Resonator - Multiple Pass

49 Criterion List

50 Simple Concept Matrix

51 Simple Concept Matrix (cont.)

52

53 Weighted Concept Screening Matrix

54

55

56 Results

57 Resulting Design Options Unpacked Concentric Tube Resonator Packed Concentric Tube: –Metal Foam –Lava Rock/Rockwool and Stainless Steel Wool Variable Length Resonator - Single Pass ANC (End Cap Silencer, Multiple Exhaust Pipes)

58 Critical Action Items Action ItemGoalNo Later Than Design Commitment Oct. 15 Data Collection (CB)Oct. 14Oct. 21 Engine Model (CM)Oct. 18Oct. 25 Design Resonator (JM)Oct. 22Oct. 25 Detailed BOM & Budget (CB)Oct. 29 Detailed ANC Component Requirements (TZ)Oct. 22Oct. 29 Detailed ANC Layout & Mounting Schematic (TZ)Oct. 29Nov. 1

59 Sources http://www.eastsidemufflers.com/mufflers.htm Picture Sources Slide 1 http://www.motorcycle-usa.com/photogallerys/03CBR600RReuro_DetG.jpgSlide2 Slide 2 http://www.emspowered.com/ http://www.motorcycle.com/manufacturer/honda/2003-cbr-600-track-test-1225.html Slide 5 http://www.impactlab.net/2010/07/01/new-drug-could-reverse-hearing-loss-caused-by-loud-noises/ Slide 35 http://www.dirtwerkz.com/images/products/dbdawg/db-Dawg_Black_450.jpg


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