Abstract
Ranking of noise generation mechanisms is essential for
designing low noise diesel engines. Engine noise is
caused by several excitations or sources of noise, such
as combustion, turbo charger, piston slap, valve
mechanism, fuel pumps, gears and inertia forces.
A test setup for determining valve mechanism generated
noise consisted of a medium speed diesel engine including
the engine block, cam and crank covers, cylinder heads
and valve mechanism. The camshaft was driven with an
electric motor. Sound power level measurements were
carried out in order to find out the contribution of the
valve mechanism generated noise. Strain gauge and
acceleration measurements were made to determine valve
impact forces. The effect of valve clearances was
studied. Reference measurements were carried out using a
normally operating engine.
The sound power generated by the valve mechanism can be
studied using FEM and BEM modeling. The excitations can
be modeled using a multibody model of the valve
mechanism. Also measured valve and push rod forces may be
used to estimate the excitation forces. The measured
sound power of the valve mechanism turned out to be less
than 10 % of the total sound power of the engine.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of Internoise 2008 |
| Place of Publication | Shanghai |
| Publisher | Institute of Noise Control Engineering |
| Publication status | Published - 2008 |
| MoE publication type | B3 Non-refereed article in conference proceedings |
| Event | 37th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2008 - Shanghai, China Duration: 26 Oct 2008 → 29 Oct 2008 |
Conference
| Conference | 37th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2008 |
|---|---|
| Abbreviated title | INTER-NOISE |
| Country/Territory | China |
| City | Shanghai |
| Period | 26/10/08 → 29/10/08 |