Course Outline
The Ohio State University and General Motors (Technical Education Program)
2005-2006 Edition
Graduate Course Sequence in Automotive Noise, Vibration and Harshness (NVH) Control
GM Technical Education Program
The Ohio State University/KAIST
Certificate in Automotive Noise, Vibration and Harshness (CNVH)
A. Summary of the CNVH Requirements and Schedule of Courses
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Prerequisite Course: GM1525 Mathematical Preparation for the Automotive Noise, Vibration, and Harshness (NVH) Course Sequence (OSU) Offered Fall ’05, Summer ‘07
Core Courses: |
15 Hours - CEU Units
Quarter Credit Hours: |
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ME777 |
Automotive NVH I (OSU/KAIST) Offered Fall ’05, Fall ‘07 |
4 |
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ME778 |
Automotive NVH II (OSU/KAIST) Offered Winter ’06, Winter ‘08 |
4 |
CURRICULUM
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TOTAL CORE: |
8 |
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(Choose three of four seminars) |
IDP Hours: |
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TOTAL SELF-PACED SEMINAR HOURS: |
24 |
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The Math Prep seminar is a prerequisite for the courses listed below. However, this prerequisite requirement can be waived or substituted with written permission of Professor Raj Singh, The Ohio State University, for students who can demonstrate sufficient background in the content (mathematics and Matlab).
Mathematical Preparation for the Automotive Noise, Vibration, and Harshness (NVH) Course Sequence (GM1525)
This CD-ROM course (with 2 live video conferences) covers mathematical terms used for vibration and acoustic analysis (complex notation, vectors; rms, dB, frequency scales, etc.), tutorial on Matlab and computer simulation exercises, experimental demonstrations and suggestions for self study based on individual needs. Specific topics include: complex algebra; linear algebra; matrix operations; Fourier series and transforms; differential equations and Laplace transform solution method.
Automotive NVH I (ME777)
Acoustic, vibration and harshness design criteria; sound quality; mathematical models, computer simulations and experimental concepts; isolation, damping, balancing, resonators, absorption, barriers, enclosures; effect of non-linearities, time-varying parameters, etc. Appropriate case studies (suspensions, engine mounts, shock absorbers, brake squeal, interior acoustics, powertrain torsional systems, etc.).
Structural and acoustic modal analyses; free and forced responses; structural modifications; sources and paths of vibration; acoustic intensity and source identification; rotating machinery diagnostics; semi-active and active noise & vibration control; absorbers, mufflers, etc. Appropriate case studies (body/frame vibrations; induction & exhaust systems, acoustic boom, squeak & rattle models, dynamic absorbers, dynamics of machine elements, etc.).
- Course Projects for NVH I and II: Team projects over 2 quarters (covering ME 777 and 778) will be required for students at GM. Each group works with a GM expert (and OSU/KAIST faculty) and presents a final report in the SAE paper style. Examples of team projects include: Air pump noise paths; Seat track motion perception; Half-order harmonic content in induction noise; Modal studies of transmission plates; Vehicle structure mobilities; Sound levels from engine mount forces; Modal analysis of rack and pinion; Analysis of induction manifolds and mufflers; Study of vehicle structural paths; Vehicle body material scaling issues illustrated several examples; Modeling of hydraulic mounts; Mirror vibration; Driveline models.
- Typical Group Discussion Topics for NVH I and II (via video or web conferences): Pass-by noise requirements; Development of experimental facilities; Structure-borne noise paths in vehicles; Vehicle structural modes; Engine noise and balancing; Induction system tuning elements; Exhaust system layout; Vehicle dynamics and suspension; Statistical energy analysis applied to interior acoustics; International design and marketing aspects (from the NVH perspective); Ethics and professionalism. Experts from GM and KAIST are invited to discuss key issues.
Self-Paced Seminars/Mini Courses (Select any 3 out of 4)
Notes: Each chosen seminar must be taken after completing ME777 and ME778 and will require a brief written report on a topic or question prepared by the instructor.
Rubber and Hydraulic Mounts: Dynamic Analysis, Experimental Characterization and Vibration Isolation (TEP020) (OSU)
This short course covers the principles, experimental characterization methods and mathematical models of engine mounts and vibration isolators. The source-path-receiver network and transfer function approaches will be adopted with emphasis on problem solving strategies. Dynamic design and noise, vibration and harshness considerations will be discussed for both elastomeric and hydraulic mounts. Powertrain mounting system design methods including the torque roll axis de-coupling concepts will also be presented. The role of frequency-dependent and amplitude-sensitive mount properties will be illustrated via case studies. This course is based on the extensive research and development work that has been carried out at Ohio State, and in particular, it has been designed to suit the needs of practicing engineers. Students are expected to submit a brief report on the workshop discussion questions.
Driveline System NVH Issues (TEP301) (OSU)
This short course covers the noise and vibration control methods for vehicle driveline components and systems. Both linear and nonlinear models, along with source-path-receiver network and transfer function approaches, are employed to characterize and simulate the governing torsional systems. Nonlinear effects associated with backlash, multi-staged stiffnesses and dry friction will be illustrated. Practical case studies include transmission rattle, driveline clunk, judder, gear whine, etc. This course is based on the extensive research and development work that has been carried out at Ohio State, and it has been designed to suit the needs of practicing engineers. Students are expected to submit a brief report on the workshop discussion questions.
Mid-Frequency Vibration Isolation Using the Power Flow Approach (TEP302) (KAIST)
The simplest, conventional technique of vibration isolation focuses on locating the lowest natural frequency of the system above the lowest operational frequency. This technique is useful only under simplifying assumptions. Furthermore, we often encounter many vibration problems in the mid-frequency range, which is far higher than the operational speed and, hence closely linked to the noise generation in that frequency range. This course will focus on the power flow approach as a practical tool for the solution. The course starts with introducing conventional vibration/force isolation in a single DOF system as well as inherent problems associated with this technique. Then a simplest source-path-receiver model is reviewed before discussing the multi-dimensional vibration isolation systems. The concept of vibration isolation based on the power flow approach is presented in a similar manner. This course will illustrate several real-life applications to machine mounting system. Relevant ISO standards, which are being prepared to describe the procedures for measurement and data processing, are also explained.
Acoustic Holography (TEP300) (KAIST)
Topics include: Spatial characteristics of sound waves; how does it propagate; how does it reflect on the surface of discontinuity; how is it scattered; how is it diffracted; how does it radiates in space; wrap around errors; spatial window effect; Fourier series and Fourier transform; spatial and wave number domain representation; Forward prediction (Acoustic holography; 1-D holography, 1-D Kirchhoff-Helmholtz equation); Backward prediction (3-D Kirchhoff-Helmholtz equation, its physical meaning and interpretation, Analysis problem of acoustic holography); Discretization of Kirchhoff-Helmholtz integral equation; Partial field decomposition (Fourier series and Fourier transform; spatial and wave number domain representation, de-reverberation); Wave number domain expression of Kirchhoff-Helmholtz equation, de-Dopplerization; Spatial sampling theorem; spatial aliasing.
C. Courses Listed in the GM TEP Catalog (Fall 2005)
Mathematical Preparation for the Automotive Noise, Vibration and Harshness (NVH) Course Sequence: GM1525
Rajendra Singh, The Donald D. Glower Chair in Engineering and Professor of Mechanical Engineering
GM TEP Outstanding Distance Learning Faculty Award Winner
WebEx Sessions: 8/19 and 9/9 9AM-11AM
Section Number: 1050+ Viewing Site Code (Please refer to the TEP Registration Form)
12 GM Individual Development Plan Hours
This self-paced seminar on CD with two live videoconferences covers: Mathematical terms used for vibration and acoustic analysis (complex notation, vectors; rms, dB, frequency scales, etc.); Tutorial on MATLAB and computer simulation exercises; Experimental demonstrations; Suggestions for self study based on individual needs; Complex algebra and its application to NVH problems; Linear algebra; matrix operations; MATLAB exercises; Fourier series and transforms; application of MATLAB; FFT analyzer example; Differential equations and solutions.
1. Eigenvalue Problems: Define the system matrix; Find eigensolutions; Display eigenvectors or modes (normalization with respect to the maximum value set as 1.0)
2. Frequency Response Analysis: Effect of damping
3. Creation of MATLAB Script File (m file); Saving selected variables into data file (.mat or .dat formats); Convert data to the MS Excel
Bachelor’s Degree in Engineering or Science from a regionally acccredited institution or the international equivalent.
TEP students are expected to have a personal home computer in order to complete TEP coursework since GM firewall security restrictions may present obstacles to do so on GM-issued computers. The following minimum requirements apply: CD-Rom drive, Pentium III Processor, DSL or cable modem, and 256 MB of RAM. Software requirements include: a word processing package, a spreadsheet package capable of importing Excel files, PowerPoint, and e-mail software that supports file attachments. While traveling, the same security restrictions apply and a non-GM computer/laptop should be accessible.
Course-specific requirements: RealPlayer (for view lectures on CD and videostreamed lectures), Matlab (student version is sufficient).
Minimum Enrollment 9 Maximum Enrollment 25
Automotive Noise, Vibration and Harshness (NVH) Control I: ME777
Raj Singh, The Donald D. Glower Chair in Engineering and Professor, Department of Mechanical Engineering
At The Ohio State University with the Korean Advanced Institute of Science and Technology
GM TEP Outstanding Distance Learning Faculty Award Winner
Section Number: 1000+ Site Code (Please refer to the TEP Registration Form)
4 Quarter Hours at The Ohio State University
40 GM Individual Development Plan Hours
The goal of this course is to give the student a solid understanding of the automotive NVH problems and issues involved in the design of contemporary vehicles. Students will learn the fundamentals of mechanical vibrations, acoustics, digital signal processing, and machinery dynamics into a cohesive manner. The NVH course sequence is based on an innovative case study approach, and it attempts to enhance critical thinking skills while relating NVH issues to design, manufacturing, material, performance, and economic considerations.
Successful completion of Mathematical Preparation for the Automotive Noise, Vibration and Harshness (NVH) course sequence GM1525.
TEP students are expected to have a personal home computer in order to complete TEP coursework since GM firewall security restrictions may present obstacles to do so on GM-issued computers. The following minimum requirements apply: CD-Rom drive, Pentium III Processor, DSL or cable modem, and 256 MB of RAM. Software requirements include: a word processing package, a spreadsheet package capable of importing Excel files, PowerPoint, and e-mail software that supports file attachments. While traveling, the same security restrictions apply and a non-GM computer/laptop should be accessible.
Course-specific requirements: Windows Media Player 9.0 or later; Student version of Matlab Internet Browser such as Windows Explorer.
Minimum Enrollment N/A Maximum Enrollment N/A
OBJECTIVES
1. Provide a sequence of 3 (2 for General Motors) courses based on an innovative case study approach (this is similar to what has been done in business, law and medical schools).
2. Enhance critical thinking skills and relate NVH issues to design, manufacturing, material, performance, and economic considerations.
3. Integrate concepts of mechanical vibrations, acoustics, digital signal processing, and machinery dynamics into a cohesive graduate course sequence.
COURSES
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Course |
Number (quarter hours) [semester hours] |
Quarter |
Required/optional |
|
Mathematical Preparation for NVH Course Sequence |
GM 1525(0) [0] |
Summer, odd years |
Required |
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(Technical Seminar with 0 graduate credits but 15 hours of continuing education credits) |
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Automotive NVH I |
ME 777 (4) [3] |
Autumn, odd years |
Required |
|
Automotive NVH II |
ME 778 (4) [3] |
Winter, even years |
Required |
|
Automotive NVH III |
ME 779 (4) [3] |
Spring, even years |
Optional for GM |
SPONSORS
General Motors (Technical Education Program and NVH committee)
The Ohio State University (Center for Automotive Research and Department of Mechanical Engineering)
AUDIENCE
- Approximately 20 to 35 GM Employees (from participating Technical Education Program staffs) who meet pre-requisites.
- About 10 MS degree ME or EE students at The Ohio State University (including those opting for MS in Automotive Systems). Undergraduate (honors program) students are permitted.
COURSE DEVELOPER AND INSTRUCTOR
Donald D. Glower Chair Engineering, Department of Mechanical Engineering
Director, Acoustics and Dynamics Laboratory and the Center for Automotive Research
The Ohio State University, 206 West 18th Ave., Columbus, OH 43210-1107
e-mail : singh.3@osu.edu Web site: www.AutoNVH.org
Phone: 614-292-9044 FAX: 614-292-3163
Dr. Singh received GM's Outstanding Distance Learning Faculty Award in 1998
PRE-REQUISITES
- OSU Students: Graduate standing in ME, EE, or equivalent. Knowledge of relevant mathematics (Fourier series, Laplace transforms, linear algebra, complex variables and vectors).
- GM Students: 1. Undergraduate degree in ME, EE or equivalent. 2. Must complete the Math Preparation technical seminar (GM 1525) – see below for schedule. Instructor’s permission is required to waive it.
ME 777 can be taken as a stand alone, graduate elective course by students at GM. ME 777 is a prerequisite to ME 778, and ME 778 is a prerequisite to ME 779. Instructor's permission is needed to waive the pre-requisites.
NOTES ON CREDIT OPTIONS
- OSU students have the option of choosing either 3 or 4 quarter credit version of ME 777, 778 or 779. The 4th credit is for project work.
- Students at GM must enroll in the 4 quarter (3 semester) credits option. The 4th credit is for project work.
COURSE PROJECTS
Course Projects for NVH I and II: Team projects over two quarters (covering ME 777 and 778) will be required for students at GM. Each group works with a GM expert and presents a final report in the SAE paper style. Examples of team projects include: Air pump noise paths; Seat track motion perception; Half-order harmonic content in induction noise; Modal studies of transmission plates; Vehicle structure mobilities; Sound levels from engine mount forces; Modal analysis of rack and pinion; Analysis of induction manifolds and mufflers; Study of vehicle structural paths; Vehicle body material scaling issues illustrated several examples; Modeling of hydraulic mounts; Mirror vibration; Driveline models.
Course projects may be continued in NVH III.
TYPICAL GROUP DISCUSSION TOPICS (VIA "LIVE" VIDEO CONFERENCES)
4 live video conferences per quarter (for NVH I and II)
Pass-by noise requirements; Development of experimental facilities; Structure-borne noise paths in vehicles; Vehicle structural modes; Engine noise and balancing; Induction system tuning elements; Exhaust system layout; Vehicle dynamics and suspension; Statistical energy analysis applied to interior acoustics; International design and marketing aspects (from the NVH perspective); Ethics and professionalism. Experts from industry (such as General Motors and Goodyear) are invited to discuss key issues.
WORK LOAD
|
Requirement |
Math Prep |
ME 777 |
ME 778 |
ME 779 |
|
Lectures (90 min. each) Video Conf (2 hours each) |
6 (2 hours each) 2 |
16 4 |
16 4 |
16 --- |
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Homework assignments |
-- |
4 of 5 |
4 out of 5 |
2 |
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Exams |
-- |
Midterm & Final (Take Home) |
Midterm & Final (Take Home) |
Quizzes (In Class) |
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Field Trip |
-- |
-- |
Visit GM Proving Ground |
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Chief goal of this course is to prepare students for the Automotive NVH course sequence. Mathematical topics include complex algebra, linear algebra and matrix operations; Laplace transforms, frequency response functions; differential equations and solutions; Fourier series and transforms. Terms used for vibration and acoustic analyses such as mean-square values, decibels, frequency scales, etc. are also introduced. Tutorial on MATLAB and computer simulation exercises are included along with a few
- Mathematical terms used for vibration and acoustic analysis
- Complex algebra and its application to NVH problems
- Linear algebra; matrix operations; MATLAB exercises
- Differential equations and solutions
- Laplace transforms
- Fourier series and
- Fourier transforms; application of MATLAB; FFT analyzer example
- Matlab/Maple demos
- Suggestions for self study based on individual needs
- Practice problems
Chief goal of this course is to give the student a solid understanding of the automotive NVH problems and issues involved in the design of contemporary vehicles. Students will learn the fundamentals of mechanical vibrations, acoustics, digital signal processing, and machinery dynamics into a cohesive manner. The NVH course sequence is based on an innovative case study approach, and it attempts to enhance critical thinking skills while relating NVH issues to design, manufacturing, material, performance, and economic considerations.
- Acoustic, vibration and harshness design criteria; sound quality
- Source-path-receiver concepts and their applications to vehicle problems
- Mathematical models and computer simulation based on input-system-output paradigm
- Frequency response functions and system parameters
- Experimental concepts; digital signal processing
- Vibration & noise control elements: Isolation, damping, balancing, resonators, absorption, barriers, enclosures;
- Appropriate vehicle case studies: suspensions, engine mounts, shock absorbers, panel damping, interior acoustics, induction system, powertrain torsional systems and gear noise, etc.
- Group discussion topics (via "live" video conferences): Pass-by noise requirements; Development of experimental facilities; Structure-borne noise paths in vehicles; Engine noise and balancing; Ethics and professionalism. Experts from GM are invited to discuss key issues.
- Math: Linear Algebra, Fourier series, Laplace and Fourier Transforms, Differential Equations
- Vibration/Dynamics: Single Degree of Freedom System; Transfer Functions
- Course: “Math Prep” Technical Seminar (GM 1525) for GM students
This course is specifically targeted at engineering students enrolled in a Masters or undergraduate (honors) program in Mechanical Engineering or related disciplines.
1. ME 777 Course Notes by R. Singh, current quarter edition
2. Mechanical Vibration, by J.P. Den Hartog, Dover, 1985
3. Noise & Vibration Control, by L. L. Beranek, INCE/Bookmasters, 1988
Chief goal of this course is to give the student a solid understanding of the automotive NVH problems and issues involved in the design of contemporary vehicles. Students will learn the fundamentals of vibrations, modal analysis, lumped acoustics, digital signal processing, and machinery dynamics into a cohesive manner. The NVH course sequence is based on an innovative case study approach, and it attempts to enhance critical thinking skills while relating NVH issues to design, manufacturing, material, performance, and economic considerations. This course is a continuation of ME 777 (NVH I).
- Vehicle Modal Analysis: Eigenvalue problems, modal domain properties; 1/2, 1/4 and full car models; drivetrain dynamics and torsional models.
- Frequency Response and Vibration Control: Vibration absorber concept and vehicle applications; beam experiment; frequency response methods.
- Modal Testing and Beam Vibrations: Material selection issues and boundary conditions; beam vibrations; 2-channel processing; modal testing procedures; visco-elastic damping and modal radiation.
- Advanced Topics: Mobility Synthesis Method; Lumped Parameters Acoustic Models.
- Appropriate case studies: Body/frame vibrations; induction & exhaust systems, acoustic boom, squeak & rattle models, dynamic absorbers; dynamics of machine elements, etc.
- Course: ME 777 (NVH I), or the permission of instructor.
- Topics: Vibro-Acoustic Design & Evaluation Criteria; Vibration Control (based on Single Degree of Freedom Systems); Frequency Analysis (Single Channel); Acoustic Plane Waves and Noise Control
1. ME 778 Course Notes by R. Singh, current quarter edition
2. Mechanical Vibration, by J.P. Den Hartog, Dover, 1985
3. Noise & Vibration Control, by L. L. Beranek, INCE/Bookmasters, 1988
Chief goal of this course is to give the student a solid understanding of the automotive NVH problems and issues involved in the design of contemporary vehicles. Students will learn the fundamentals of vibration & sound sources, multi-channel digital signal processing, and spatial domain measurements in a cohesive manner. The NVH course sequence is based on an innovative case study approach, and it attempts to enhance critical thinking skills while relating NVH issues to design, manufacturing, material, performance, and economic considerations. This course is a continuation of ME 777 (NVH I) and ME 778 (NVH II).
3D acoustic cavies; structural-acoustic responses using modal expansion
Operating motion surveys; laser scanning system
2-microphone method; near field holography, etc.
Friction sources: driveline clutch judder, brake squeal, belt vibration, tire noise, etc.
Clearance sources: transmission rattle, door slam, piston slap, etc.
Aerodynamic sources: vehicle body, mirrors, door seals, alternators, saws, antenna, etc.
Research/independent work methods, oral presentation and report documentation
Course: ME 777 (NVH II), or the permission of instructor.
Topics: Modal Analysis, Vibration & Noise Control Concepts; Frequency Response Methods; Acoustic Plane Waves and Lumped Approaches
1. ME 779 Course Notes by R. Singh, current quarter edition
2. Mechanical Vibration, by J.P. Den Hartog, Dover, 1985
3. Noise & Vibration Control, by L. L. Beranek, INCE/Bookmasters, 1988
