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Old 11-15-2016, 03:43 PM   #21
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Is this a silencer?
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Old 11-15-2016, 03:52 PM   #22
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Generator vibration and noise

https://youtu.be/rDBgfExSuWM
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Old 11-15-2016, 04:05 PM   #23
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From the pilothouse.
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Old 11-15-2016, 04:10 PM   #24
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https://youtu.be/AwSfM7V7Kww
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Old 11-15-2016, 04:37 PM   #25
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Generator vibration and noise

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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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Old 11-15-2016, 04:46 PM   #26
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here is one web site of several to get you started searching

https://acousticalsolutions.com/prod...isolation-pad/

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Old 11-15-2016, 04:57 PM   #27
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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.
Can't hurt. But I'd slip 4-5 of them under the pan to spread the load.
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Old 11-15-2016, 05:01 PM   #28
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Can't hurt. But I'd slip 4-5 of them under the pan to spread the load.

Good idea. Thanks.

Does 88-90db with the genny running seem loud to you? Maybe I'm just easily annoyed.
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Old 11-15-2016, 05:14 PM   #29
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Good idea. Thanks.

Does 88-90db with the genny running seem loud to you? Maybe I'm just easily annoyed.
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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Old 11-15-2016, 05:21 PM   #30
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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.

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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Old 11-15-2016, 05:48 PM   #31
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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.
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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Old 11-15-2016, 06:16 PM   #32
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Good idea. Thanks.

Does 88-90db with the genny running seem loud to you? Maybe I'm just easily annoyed.
Yes, that seems very loud for just a genset.
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Old 11-15-2016, 07:23 PM   #33
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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?
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.

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Old 11-15-2016, 07:32 PM   #34
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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.
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Old 11-15-2016, 10:07 PM   #35
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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.
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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Old 11-15-2016, 11:36 PM   #36
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Dang, I didn't think my genset was THAT loud.

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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Old 11-15-2016, 11:55 PM   #37
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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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Old 11-16-2016, 12:22 AM   #38
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Carpet bad idea. Fire hazard.
Do you have carpet in your home or office/place of business?
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Old 11-16-2016, 08:00 AM   #39
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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?
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Old 11-16-2016, 08:10 AM   #40
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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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