Introduction to Contemporary Muffler Design Techniques
I.D. # C1352 Duration .5 Day
Most muffler design in the automotive industry is accomplished by using "cut-and-try" methods that rely on what has worked in the past and/or extensive full-scale testing on engines for validation. New computer software aimed at muffler design can shorten the design cycle and yield more effective results.

This four hour seminar provides an introduction to the behavior of mufflers and silencers including a description of the two-port approach to muffler design. This seminar covers the acoustic simulation of muffler and silencer systems and the use of experimental methods to measure muffler performance. Following a review of basic muffler concepts and definitions, this seminar will focus on meeting design objectives such as insertion loss with a specified back pressure requirement. This seminar will show how modern software such as SIDLAB can be used to model both the acoustics and flow in achieving the design objective and the role that 1D engine simulations can play in providing important input. The final topic will cover optimizing muffler design to meet a specified design objective with a specified space constraint. The main focus is on IC-engine intake and exhaust systems, but most of the information is also applicable to any pipe or duct system.

Learning Objectives

By attending this seminar, you will be able to:

  • Explain the underlying principles of mufflers and silencers
  • Gain insight into muffler and silencer design concepts using contemporary software
  • Understand experimental methods for measuring muffler and silencer performance

Who Should Attend
This course is designed for engineers and technical managers seeking an understanding of the principles of muffler design and an introduction to the use of muffler and silencer design software. In addition, other personnel from companies that design, purchase, or manufacture muffler or silencer systems will also benefit from the information presented in this seminar.
Knowledge of basic acoustics is assumed. Mathematics to an engineering degree level is desirable, but not required.
Seminar Content


  • Overview of Engine Exhaust and Intake Systems
    • Definitions: TL, IL, etc.
    • Performance measures for intake and exhaust systems
  • Engine Exhaust and Intake Systems Measurement Methods
    • Measurement of TL
    • Measurement of IL
  • Design Approach for Exhaust and Intake Systems
    • Two-port method for modeling
    • Typical results for muffler system design
  • Software for Engine Exhaust and Intake Modeling Design
    • Optimization to meet a specific design objective
    • Examples of muffler system design

Instructor(s): Tamer Elnady or Andrew F. Seybert

Tamer Elnady, Ph.D., is currently Associate Professor of Engineering at Ain Shams University, Cairo, Egypt, where he also serves as Head of the Ain Shams University Sound & Vibration Laboratory.  Dr. Elnady is President of the Acoustical Society of Egypt.  An expert in Duct Acoustics, he is one of the developers of SIDLAB Software for the simulation of sound propagation in duct systems and serves industry as a consultant in Europe, USA, Egypt, and the Gulf region in the field of muffler design, noise control, and environmental acoustics modeling.  Dr. Elnady received his B.Sc. and M.Sc. in Mechanical Engineering from Ain Shams University and his Ph.D. in Technical Acoustics from the Royal Institute of Technology (KTH), Stockholm, Sweden. 

Andrew F. Seybert, Ph.D., P.E., is President of Spectronics, Inc. and Professor Emeritus of Mechanical Engineering at the University of Kentucky. His research specialization is acoustics and vibrations. Dr. Seybert is a Fellow of the Acoustical Society of America, the American Society of Mechanical Engineers, and the International Institute of Acoustics and Vibration. Dr. Seybert is a Founding Member of the International Institute of Acoustics and Vibration.  Dr. Seybert is a registered Professional Engineer in the states of Kentucky and Ohio. He has been active in SAE professional development and other NVH activities for many years and is the recipient of the SAE's Lloyd L. Withrow Distinguished Speaker Award.  Dr. Seybert received his B.S. Mechanical Engineering from the University of Cincinnati and the M.S. and Ph.D. Mechanical Engineering from Purdue University.

Fees: $299 SAE Members: $299


CEU .4