ME498: Special Topics (Acoustics and Vibrations in Design) Winter 2007 Department of Mechanical Engineering, University of Saskatchewan http://www.csaengineering.com/spclnch/m-strut.shtml Instructors: R. Fotouhi Office: 2B35 Phone: 966-5453 e-mail: Reza.Fotouhi@usask.ca Class Web Site: http://www.engr.usask.ca/classes/ME/498/ Office Hours: TBA Lecture: MWF 8:30-9:20 Lab: M (alternating week) 2:30-5:30 Prerequisites: ME316 COURSE DESCRIPTION: This course is an introduction to acoustics and vibrations in design. Free, and forced vibrations of systems will be examined. Applied theory includes the study of the fundamental single-degree-of-freedom (DOF) and the 2DOF systems using Newton's law of motion, the energy method, Langrange's equations, and determination of natural frequencies, acoustics, properties, and noise standards. Design part of the course includes systems under shock and impact loading, vibration isolation and control. In addition the course will include noise control and design of mechanical systems for noise reduction. The course includes design oriented lab and assignments, and design based project. TEXTBOOKS: • Acoustics and noise control 2nd Edition, B.J. Smith, R.J. Peters, and S. Owen, Addison • • • • Wesley, 1996. (Textbook) Mechanical Vibrations 4th Edition, Rao, S. S., Prentice Hall, 2004. (Textbook) http://www.phptr.com/bookstore/product.asp?isbn=0130489875&rl=1 Fundamentals of Noise and Vibration Analysis for Engineers, 2nd Edition, M. P. Norton and D. G. Karczub, Cambridge University Press, 2003 (Reference) http://www.cambridge.org/uk/catalogue/catalogue.asp?isbn=0521499135 Mechanical Vibration, W.J. Palm, III, Wiley, 2007 (Reference) http://hecda.wiley.com/WileyCDA/HigherEdTitle/productCd-0471345555.html Foundations of Engineering Acoustics, F.J. Fahy, Academic Press, 2001 (Reference) EVALUATION: Midterm Examination Final Examination Assignments Design Project* Quiz & Lab Participation 15% 50% 10% 20% 5% The assigned questions are about 3 to 5 questions per set. The assigned questions should be handed in as a set by 4:00 pm of the due dates. Late submission of assigned works will be penalized by 10% per day and may not be accepted. Up to two persons can team-up for the project. The design project includes a report and presentation in a related topic such as Determination of natural frequencies and mode shapes, Vibration control, Vibration measurement and applications, Finite element in vibration analysis and design, Vibration analysis using MATLAB, ANSYS, and ADINA. Other related topics may also be accepted for design project, if approved by the instructor. Students are expected to hand in a written report, not exceeding 20 pages, and present their project to the class. IMPORTANT DATES January 3, 2007: First day of classes. January 16, 2007: Last day to make changes in registration for second-term classes. February 7-9, 2007: Midterm exams for Mechanical Engineering third and fourth years. February 12-17, 07: Midterm break. March 15, 2007: Last day to withdraw from second-term classes without academic penalty. April 9, 2007: Last day of classes. April 12-30, 2007: Final examinations period. A final exam schedule will be posted by the Registrar's Office (www.usask.ca/registrar/exams). May 16, 2007: Closing date for submitting requests for supplemental exam. June 7, 2008: Deferred exams begin for second and two-term classes. GENERAL INFORMATION The course consists of three one-hour lectures per week and three hour lab every other week. A list of suggested homework problems is attached. Some problems are assigned for assignments. Additional problems may be assigned. It is your responsibility to learn how to solve these problems. Difficulties in the assigned problems are addressed in the lab. Assignment guidelines: Please use the following as guidelines for your assignments 1. Use one side of the engineering pad or similar paper. 2. Leave margins clear except for identifying the answers. 3. Staple sheets at the top left corner of the paper. 4. Write your name and the class number on the top right corner of the paper. 5. Drawings/graphs and your writing should be very clear and precise. 6. Write text of the question. 7. Use at least one page per question. All marked work is returned most likely within a week and solutions placed on the class web site. Regular attendance at all classes is compulsory. If you must be absent, assume responsibility for the missed material. Missed tests may be written by prior arrangement. Please make these arrangements before you miss the class. A few minutes are set aside at the beginning of each lecture period to solve difficulties arising from the preceding materials. Orderly discussions are encouraged during the lecture. You are encouraged to stop in during selected hours to talk about any problem or suggestions you may have concerning the course; about careers; or just about things in general. If you would like to see me outside of selected hours, feel free to schedule an appointment. Lecture Summary ME 498.3 Acoustics Design and Vibrations Suggested questions Periods Topics Weeks 1 • Rao Ch 1- Fundamentals of vibration • Basic concept of vibration • Harmonic analysis • Design case study using MATLAB (forging hammer) 2 • Rao Ch 2- Free Vibration - Single DOF Systems • Free vibration of undamped and damped systems • Using energy method in design • Design case study (lunar excursion module) 3,4 • Rao Ch 3- Harmonically Excited Vibration (1DOF) • Response of damped and undamed systems under harmonic excitation • Design case study (minimum weight water tank) 5 • Rao Ch 4- Vibration Under general Forcing Conditions • Response under general periodic and non-periodic forces • Response spectrum for base excitation • Design under a shock environment • Design case study (milling cutter) 6,7 • Rao Ch 5- Two DOF systems* • Equations of motion for forced vibration • Free vibration of an undamped system • Design of a torsional system (marine engine propeller) • Design case study (Anvil and work-piece) 8,9 • Rao Ch 9- Vibration suppression and control • Vibration criteria • Balancing of rotating machines • Whirling of rotating shafts • Balancing of reciprocating engines • Design for vibration control • Vibration isolation • Vibration absorbers • Design case study (isolator design of milling machine) 10 11 12 13 • • • • • • • • • • • • • • • • • • • • • Rao Ch 10- Vibration measurement and applications Transducers Vibration pickups Frequency measuring instruments Vibration exciters Machine condition monitoring and diagnosis Design case study (Frahm tachometer) Norton Ch 8- Noise and vibration as a design tool Review of available signal analysis techniques Fault detection from noise and vibration (for gears, rotors and shafts, bearings, fans, punch presses, pumps) Smith Ch 1- Measurement of sound Introduction to sound measurement equipment Smith Ch 8- Noise-control engineering The noise chain: source-path-receiver Reduction of noise from sound radiating surfaces Reduction of noise from machinery Control of noise by good planning and management Acoustic enclosures Active noise control Smith Ch 10- The law relating to noise Case studies (legal control of aircraft noise) *Time permits Laboratory Summary ME 498.3 Acoustics Design and Vibrations Periods Topics Weeks 2 • Introduction to MATLAB • Introduction to ANSYS 4 • Design case study examples for free vibration of single DOF systems 6 • Design case study examples for forced vibration of single DOF systems 8 • Design case study examples for Vibration control 10 • Design case study examples for Noise-control engineering 12 • Presentations of design projects