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11-15-2016, 02:43 PM
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#21
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Guru
City: Victoria TX
Vessel Name: Bijou
Vessel Model: 2008 Island Packet PY/SP
Join Date: Nov 2012
Posts: 5,290
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Is this a silencer?
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11-15-2016, 02:52 PM
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#22
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Guru
City: Victoria TX
Vessel Name: Bijou
Vessel Model: 2008 Island Packet PY/SP
Join Date: Nov 2012
Posts: 5,290
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Generator vibration and noise
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11-15-2016, 03:05 PM
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#23
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Guru
City: Victoria TX
Vessel Name: Bijou
Vessel Model: 2008 Island Packet PY/SP
Join Date: Nov 2012
Posts: 5,290
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From the pilothouse.
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11-15-2016, 03:10 PM
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#24
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Guru
City: Victoria TX
Vessel Name: Bijou
Vessel Model: 2008 Island Packet PY/SP
Join Date: Nov 2012
Posts: 5,290
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11-15-2016, 03:37 PM
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#25
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Guru
City: Victoria TX
Vessel Name: Bijou
Vessel Model: 2008 Island Packet PY/SP
Join Date: Nov 2012
Posts: 5,290
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Generator vibration and noise
So I was thinking, maybe I can just jack up the generator somehow (weighs around 500 lbs I think) and slide these 1/2" rubber strips under the pan where the tabs are. Think that type of rubber will hold up and provide some isolation? 60A is supposed to be like car tire hardness.
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11-15-2016, 03:57 PM
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#27
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Guru
City: Sarasota/Ft. Lauderdale
Join Date: Apr 2014
Posts: 5,438
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Quote:
Originally Posted by cardude01
Attachment 58637
So I was thinking, maybe I can just jack up the generator somehow (weighs around 500 lbs I think) and slide these 1/2" rubber strips under the pan where the tabs are. Think that type of rubber will hold up and provide some isolation? 60A is supposed to be like car tire hardness.
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Can't hurt. But I'd slip 4-5 of them under the pan to spread the load.
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11-15-2016, 04:01 PM
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#28
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Guru
City: Victoria TX
Vessel Name: Bijou
Vessel Model: 2008 Island Packet PY/SP
Join Date: Nov 2012
Posts: 5,290
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Quote:
Originally Posted by Capt.Bill11
Can't hurt. But I'd slip 4-5 of them under the pan to spread the load.
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Good idea. Thanks.
Does 88-90db with the genny running seem loud to you? Maybe I'm just easily annoyed.
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11-15-2016, 04:14 PM
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#29
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Guru
City: Fort Lauderdale. Florida, USA
Join Date: Jan 2014
Posts: 21,449
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Quote:
Originally Posted by cardude01
Good idea. Thanks.
Does 88-90db with the genny running seem loud to you? Maybe I'm just easily annoyed.
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88-90 decibels sounds loud to me with the generator and engines running. Anything over 80 is too loud to me, so I share your noise annoyance. Actually I prefer to stay under 75.
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11-15-2016, 04:21 PM
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#30
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Guru
City: Victoria TX
Vessel Name: Bijou
Vessel Model: 2008 Island Packet PY/SP
Join Date: Nov 2012
Posts: 5,290
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Quote:
Originally Posted by BandB
88-90 decibels sounds loud to me with the generator and engines running. Anything over 80 is too loud to me, so I share your noise annoyance. Actually I prefer to stay under 75.
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You know it's funny, I am driving home now in my Tahoe, which I don't consider to be very loud, and using the same decibel meter on my iPhone going 70 miles an hour my Tahoe registers the same 88 to 90 dB.
Something about that generator noise just bothers me I guess. It's a much deeper noise than a normal road noise in the car.
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11-15-2016, 04:48 PM
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#31
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Guru
City: Fort Lauderdale. Florida, USA
Join Date: Jan 2014
Posts: 21,449
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Quote:
Originally Posted by cardude01
You know it's funny, I am driving home now in my Tahoe, which I don't consider to be very loud, and using the same decibel meter on my iPhone going 70 miles an hour my Tahoe registers the same 88 to 90 dB.
Something about that generator noise just bothers me I guess. It's a much deeper noise than a normal road noise in the car.
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We both have sports cars and, especially with the top down, they're loud. Maybe next car will be a Tesla.
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11-15-2016, 05:16 PM
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#32
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Guru
City: Sarasota/Ft. Lauderdale
Join Date: Apr 2014
Posts: 5,438
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Quote:
Originally Posted by cardude01
Good idea. Thanks.
Does 88-90db with the genny running seem loud to you? Maybe I'm just easily annoyed.
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Yes, that seems very loud for just a genset.
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11-15-2016, 06:23 PM
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#33
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Valued Technical Contributor
City: Litchfield, Ct
Join Date: Aug 2012
Posts: 6,786
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Quote:
Originally Posted by cardude01
Is there such a thing as a big thick sheet of rubber I could slide under this pan then use some longer lag bolts on the same tabs?
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I don't think a rubber sheet would do much good. Look at the Soundown bushing. It has the deep rubber cone with grooves in it which gives it flexibility. You can't get the flexibility without depth.
David
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11-15-2016, 06:32 PM
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#34
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Guru
City: Cape May, NJ
Vessel Name: Irish Lady
Vessel Model: Monk 36
Join Date: Dec 2007
Posts: 4,966
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85 db would require hearing protection at our plant. The threshold may be lower now because 85 still leads to long term hearing loss.
__________________
Archie
Irish Lady
1984 Monk 36 Hull #46
Currently in Cape May, NJ
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11-15-2016, 09:07 PM
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#35
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Guru
City: Fort Lauderdale. Florida, USA
Join Date: Jan 2014
Posts: 21,449
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Quote:
Originally Posted by High Wire
85 db would require hearing protection at our plant. The threshold may be lower now because 85 still leads to long term hearing loss.
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OSHA has essentially set 85 as the limit for an 8 hour day. It's officially 90 but above 85 you have to develop a hearing protection program that is more trouble than complying with 85. NIOSH is at 85. OSHA allows 2 hours at 100 and NIOSH only recommend 15 minutes as the limit.
The charts I've used went something like this. 85 decibels for 8 hours, 88 for 4 hours, 91 for 2 hours, 94 for 1 hour and 97 for 30 minutes. I only remember because of the obvious pattern, cutting the time in half for every 3 decibels. That means 15 minutes at 100 and the pattern continues on up.
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11-15-2016, 10:36 PM
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#36
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Guru
City: Victoria TX
Vessel Name: Bijou
Vessel Model: 2008 Island Packet PY/SP
Join Date: Nov 2012
Posts: 5,290
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Dang, I didn't think my genset was THAT loud. [emoji15]
It's more of a low rumble, so that's why I'm thinking if I isolate that pan it could help. I looked at the genset engine mounts today between the engine and the pan (the two I could get to) and the rubber seemed OK I think.
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11-15-2016, 10:55 PM
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#37
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Senior Member
Join Date: Nov 2011
Posts: 392
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Carpet bad idea. Fire hazard. Ceiling tile sound insulation possible for wall and ceiling. If this is a new sensation check engine operation
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11-15-2016, 11:22 PM
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#38
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Guru
City: Sarasota/Ft. Lauderdale
Join Date: Apr 2014
Posts: 5,438
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Quote:
Originally Posted by MVDarlin
Carpet bad idea. Fire hazard.
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Do you have carpet in your home or office/place of business?
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11-16-2016, 07:00 AM
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#39
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Guru
City: Rodney Bay Lagoon
Vessel Name: "Dragon Lady"
Vessel Model: DeFever 41
Join Date: Feb 2008
Posts: 681
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Cardude:
i) Yes, that is the air silencer/cleaner. Induction noise is probably as low as it is going to get.
ii) You have four engine mounts. Might be worth while talking to the manufacturer to see if they recommend softer mounts. Be sure you need them as they will be something of a PITA to instal. The heat exchanger is a somewhat unusual arrangement, but I don't see it plays any part in your noise problem.
iii) Did you remove the end panel of the sound-enclosure? If not, where is it?
iv) You might consider adding Sound-Down or similar to the overhead and walls of the compartment and/or an accoustic blanket over the sound-enclosure. Be carefull not to block any vents.
v) Ski makes a good point about rigid components carrying noise. Exhaust hose can be one such. Is it touching where it should not?
__________________
Mike
If all else fails, read the instructions
If it ain't broke, don't fix it
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11-16-2016, 07:10 AM
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#40
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Guru
City: Victoria TX
Vessel Name: Bijou
Vessel Model: 2008 Island Packet PY/SP
Join Date: Nov 2012
Posts: 5,290
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Thanks!
Engine mounts-- you are correct, they are very hard (maybe impossible?) to get to.
I have the end panel of the enclosure. Just had it off while I looked around.
I actually bought some Soundown foam yesterday to mount to the ceiling and door to the "generator room". Maybe that will help.
I crawled to the back of the generator room and did notice the exhaust hose looked like it was touching a spot of the bulkhead cutout so I will try to isolate that.
I put my hand on the genset exterior sound enclosure while it was running and it vibrates quite a bit. I always assumed that was just normal but maybe not?
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