Diesel Sound Quality
Diesel Sound Quality
(OP)
Hi Experts,
In an automotive technical center, diesel engine NVH section we are, just now starting SQ activities in order to add it to our development target sheets. Now only absolute interior noise are required, but we know that it might not be enough.
Firstable, we are trying to choose better SQ indexes for Diesel engine.
We are thinking in choose indexes that shows the fluctuant, rough, impulsive character of the noise as sharpness, roughness... and we are going to use an index related with diesel combustion noise.
I would like to know if from your experience, you have good tips and mistakes that ye could avoid from the begginning.
Many thanks!!
In an automotive technical center, diesel engine NVH section we are, just now starting SQ activities in order to add it to our development target sheets. Now only absolute interior noise are required, but we know that it might not be enough.
Firstable, we are trying to choose better SQ indexes for Diesel engine.
We are thinking in choose indexes that shows the fluctuant, rough, impulsive character of the noise as sharpness, roughness... and we are going to use an index related with diesel combustion noise.
I would like to know if from your experience, you have good tips and mistakes that ye could avoid from the begginning.
Many thanks!!





RE: Diesel Sound Quality
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Diesel Sound Quality
Just remark that our objective is to 'smooth' diesel knocking noise. Probably SQ is more related to sportiveness, powerfulness, etc...
But that we are looking for is some index that judges the 'awful' diesel noise, not only the SPL.
We are quite interested in Loudness, 1/f freq ratio, sharpness, fluct strenght....
Do you have experience in that field?
Thanks,
Francisco
RE: Diesel Sound Quality
For a given engine it was possible to develop rules of thumb, but almost all of my engine noise quality work relied on a critical ear and a bit of filtering.
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Diesel Sound Quality
- Steve
RE: Diesel Sound Quality
But for instance: dont you prefer the disel sound of VWGolf than others?
I feel it as the most diesel pleasant sound, and I think that the question is regarding the 1/f freq ratio...
Many thanks,
Francisco.
RE: Diesel Sound Quality
Back to your original point though. The engine itself is no longer part of the equation. Today's T/C diesels are quiet and refined (if you exclude cold start). Bad noises are gone. The problem is making the sporty models sound sporty - making the good noises lounder. Sportiness is normally associated with intake noise and T/C diesels don't really have any (the compressor kills most engine pulsation noise).
So some companies are going to great (and wierd) lengths to make T/C diesels sound like N/A gasolines. Check this out:
ht
- Steve
RE: Diesel Sound Quality
Sorry...
- Steve
RE: Diesel Sound Quality