Re: Whirlpool Dehumidifier Vibration Noise Frustration

Hi Perry,

I changed the fan speed (High/Low), but it made no difference in the
vibration noise. The "root" of the vibration noise in my dehumidifier is the
compressor, which is mounted on rubber grommets (I checked them) to reduce
vibration transfer to the cabinet. Unfortunately, the grommets are not
"working" as they should and the cabinet is "amplifying" the compressor
vibration. If I had the proper springs, I would replace the rubber grommets
and use springs.

John


On Thu, 17 Sep 2009 18:22:58 +1000, in microsoft.public.windows.vista.general
you wrote:

>On Tue, 15 Sep 2009 07:36:38 -0400, wrote:
>
>
>> I became very disappointed with it because of the vibration noise.
>
>I had the same problem with my Whirlpool Dehumidifier Model
>AD50DSS2. The vibration is caused by a cheap generic CPU fan. Just
>replace it with a quality one from CoolerMaster, Thermalright etc and
>your problem will be solved. You can find more information in the
>Whirlpool Dehumidifier newsgroup.
>
>Perry
>
>

On Sun, 20 Sep 2009 12:03:46 -0400, wrote:

>Hi Perry,
>
> I changed the fan speed (High/Low), but it made no difference in the
>vibration noise. The "root" of the vibration noise in my dehumidifier is the
>compressor, which is mounted on rubber grommets (I checked them) to reduce
>vibration transfer to the cabinet. Unfortunately, the grommets are not
>"working" as they should and the cabinet is "amplifying" the compressor
>vibration. If I had the proper springs, I would replace the rubber grommets
>and use springs.
>
> John
>
>

Well, to me it sounds like the problem is resonance. If the resonant
frequency of the cabinet is nearly the same as the frequency of the
compressor, then there's going to be problems. There are several
approaches to the problem (isolation, ie the grommets, is usually
effective). Another approach is to change the resonant frequency of
the cabinet (since running the compressor at a different speed is
probably not possible). The resonant frequency is dependent on both
the spring constant (or basically the flexibility of the cabinet) and
the mass. So the first thing I'd try is damping the cabinet by adding
weight, preferable something like heavy and thick padding. I've seen
such "sheeting" advertised for underling thin stainless steel sinks,
and it works fairly well.
If that doesn't do the job, then another thing that might help is
adding mass by applying RTV (silicone) rubber in large quantity and
allowing it to cure. This adds both weight and it will act to damp out
the motion.
good luck...

Awesome! I bet that would work --- & thinking of the Windows sound enhancements ...

"Charlie Hoffpauir" <> wrote in message news:...
> On Sun, 20 Sep 2009 12:03:46 -0400, wrote:
>
>>Hi Perry,
>>
>> I changed the fan speed (High/Low), but it made no difference in the
>>vibration noise. The "root" of the vibration noise in my dehumidifier is the
>>compressor, which is mounted on rubber grommets (I checked them) to reduce
>>vibration transfer to the cabinet. Unfortunately, the grommets are not
>>"working" as they should and the cabinet is "amplifying" the compressor
>>vibration. If I had the proper springs, I would replace the rubber grommets
>>and use springs.
>>
>> John
>>
>>
>
> Well, to me it sounds like the problem is resonance. If the resonant
> frequency of the cabinet is nearly the same as the frequency of the
> compressor, then there's going to be problems. There are several
> approaches to the problem (isolation, ie the grommets, is usually
> effective). Another approach is to change the resonant frequency of
> the cabinet (since running the compressor at a different speed is
> probably not possible). The resonant frequency is dependent on both
> the spring constant (or basically the flexibility of the cabinet) and
> the mass. So the first thing I'd try is damping the cabinet by adding
> weight, preferable something like heavy and thick padding. I've seen
> such "sheeting" advertised for underling thin stainless steel sinks,
> and it works fairly well.
> If that doesn't do the job, then another thing that might help is
> adding mass by applying RTV (silicone) rubber in large quantity and
> allowing it to cure. This adds both weight and it will act to damp out
> the motion.
> good luck...

(-:

Perhaps Windows Vista could be used to solve the problem with the right hardware & a little savvy. Ever watch bats navigate at
night? I just couldn't pass that one up.

Anyway, one could use the Windows recorder (with a good mic) to record the wave, then place a well designed speaker (perhaps in the
cabinet or at some calculated spot), play the wave continuously so that it acts as a sort of anti-wave, cancelling out the original
wave --- though there may be some more practical solutions.


"Charlie Hoffpauir" <> wrote in message news:...
> On Sun, 20 Sep 2009 12:03:46 -0400, wrote:
>
>>Hi Perry,
>>
>> I changed the fan speed (High/Low), but it made no difference in the
>>vibration noise. The "root" of the vibration noise in my dehumidifier is the
>>compressor, which is mounted on rubber grommets (I checked them) to reduce
>>vibration transfer to the cabinet. Unfortunately, the grommets are not
>>"working" as they should and the cabinet is "amplifying" the compressor
>>vibration. If I had the proper springs, I would replace the rubber grommets
>>and use springs.
>>
>> John
>>
>>
>
> Well, to me it sounds like the problem is resonance. If the resonant
> frequency of the cabinet is nearly the same as the frequency of the
> compressor, then there's going to be problems. There are several
> approaches to the problem (isolation, ie the grommets, is usually
> effective). Another approach is to change the resonant frequency of
> the cabinet (since running the compressor at a different speed is
> probably not possible). The resonant frequency is dependent on both
> the spring constant (or basically the flexibility of the cabinet) and
> the mass. So the first thing I'd try is damping the cabinet by adding
> weight, preferable something like heavy and thick padding. I've seen
> such "sheeting" advertised for underling thin stainless steel sinks,
> and it works fairly well.
> If that doesn't do the job, then another thing that might help is
> adding mass by applying RTV (silicone) rubber in large quantity and
> allowing it to cure. This adds both weight and it will act to damp out
> the motion.
> good luck...