Abstract
Exhaust noise is an important component in piston engine
power plant environmental noise. It originates from
engine as well as from turbulent gas flow in exhaust
duct. Flow-related part has been less important but has
caught more attention recently. A case study concerning
noise of a part of a real exhaust duct was conducted.
Simulations were done in several phases with increasing
level of model capability and complexity. Steady state
CFD provided information of the noise generation regions
and levels. Transient CFD, resolving the turbulent
structures, was then used to obtain more realistic
information of the levels and frequency content. Finally,
results from transient CFD were used as a FSP excitation
for structural FE-model of the duct connected to exterior
sound field. In-duct pressures estimated by transient CFD
were in a very good agreement with experimental data from
50 to 500 Hz. It was also noticed that FSP excitation
sets very strict demands on structural models because of
potential spatial aliasing due to high wave-numbers
involved. Correct description of both temporal as well as
spatial characteristics of the excitation is essential
for valid vibro-acoustic model.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of BNAM 2014 |
| Publisher | European Acoustics Association (EAA) |
| Pages | 554-560 |
| ISBN (Print) | 978-87-995400-1-3 |
| Publication status | Published - 2014 |
| MoE publication type | D3 Professional conference proceedings |
| Event | Baltic-Nordic Acoustic Meeting, BNAM 2014 - Tallinn, Estonia Duration: 2 Jun 2014 → 4 Jun 2014 |
Conference
| Conference | Baltic-Nordic Acoustic Meeting, BNAM 2014 |
|---|---|
| Abbreviated title | BNAM 2014 |
| Country/Territory | Estonia |
| City | Tallinn |
| Period | 2/06/14 → 4/06/14 |
Keywords
- aero-vibro-acoustics
- duct acoustics
- computational fluid dynamics