Exhaust Silencers (Mufflers) Design
Design of Reactive and Dissipative Exhaust Silencers
| Code | AC-03 |
|---|---|
| Days | 2 |
| PDH | 12 |
| Daily Schedule | 09:30–17:00 Hours (Dubai Time GMT+4) |
| Certificate | Yes |
| Instructor | Mohammad Abdulqader |
| Brochure | Download |
13–14 Apr 2026, Online (Zoom)
16–17 Nov 2026, Online (Zoom)
About This Course:
All sound calculations meet relevant international standards: ASHRAE, ISO, and ASTM.
This two (2) day training program uses the knowledge of industrial noise control and acoustics to apply the rules to design reactive and absorptive (dissipative) exhaust mufflers. Reactive mufflers use reflections of sound energy at the discontinuities in the exhaust mufflers to attenuate the exhaust sound, while absorptive mufflers use an absorptive material that absorbs sound. In a diesel engine exhaust system, sound is normally higher at lower frequencies than at higher frequencies. The design of the exhaust mufflers must consider these facts.
This training concentrates on the methodology of design and how to optimize it by using combined reactive and absorptive types together, supported with exercises.
Learning Objectives:
- To qualify the designers and manufacturers to design and manufacture exhaust silencers.
- To understand the diesel engine’s exhaust sound characteristics.
- To understand expansion chambers and sound wave reflections.
- To understand the reactive muffler design and insertion loss.
- To understand the dissipative muffler design and insertion loss.
- To understand the combined reactive/dissipative muffler design and insertion loss.
- To use the NEC-developed ExSound muffler design tool.
- To understand the pressure drop calculation of reactive and dissipative mufflers.
- To understand the testing and certification of exhaust mufflers in accordance to international standards.
Course Contents:
Day 1
- Overview of Sound Physics (AC-01)
- Exhaust Sound Characteristics
- Expansion Chamber TL
- Extended Pipes Effect on TL
- Multi-Chambers Effect
- Design of Reactive Mufflers
- Cancelling Troughs
- Frequency/Length Tuning of Reactive Mufflers and Selection of Chamber Length
Day 2
- ASHRAE/EGSA Standards
- Resonators in Muffler Design
- Design of Dissipative Mufflers
- Design of Combination Mufflers
- Muffler Pressure Drop
- Using ExTuner in Muffler Design
- Muffler Testing and Certification
- Exhaust Muffler Design Workshop
A free license for the NEC ExTuner® design tool is provided to all participants in the course.