i have been building / experimenting with a "noise box" for my Honda 2000.
I have been trying to run my honda inside my enclosed 7x14 box trailer (with nobody inside trailer of course). My thoughts was that it would be quieter inside the trailer, plus the security of being behind a locked door.
I have an RV electrical box on front of trailer with cord running inside to plug into generator.
I have the exhaust extension, with tail pipe that I turn down and pass through the floor of my box trailer. the actual sound from the exhaust note is very quiet.
Using a sound meter on my phone (better then just guessing with my ear) the noise measured 20' from trailer is just as loud with generator running inside trailer vrs generator running outside trailer sitting on ground.
first I started trying to isolate the vibration from generator that is conducted into plywood floor of Trailer. running some wood to stiffen the floor under the generator , than sit the generator on top of a rubber mat used for exercise helped a good bit, but still feel the vibration inside the camper through the trailer hitch (trailer stays hooked up during overnight stops where i need this generator).
I experimented with handing the generator from roof with rubber straps, no difference.
I think the sound waves generated by the mechanical noise from generator is causing the floor/sides of camper to oscillate at same frequency and now the trailer is acting like a giant speaker.
So I started a box design to enclose the generator in a sound proof box to use inside the trailer. First I looked at how the generator cools itself. It sucks air in from the side vents, than blows it out the exhaust side of generator. my box is well vented on both ends, but in order to separate the inlet cold air from the outlet hot air I have cut foam that seals along sides of generator in my "box"
I also have installed a (used) fantastic fan into the roof of my trailer (trailer has inlets in side of trailer) to suck the heat out of box trailer. if I continue development I plan to put a thermostat in the trailer to control this fan.
But fall came and development stopped as the need for generator stopped.
I also have my computerized home heating system setup so it can run off the Honda, if needed this winter I could bring the new box outside :).
Now my new Arctic fox has a compartment I can carry generator in (no plans on running it in there). and I have a cable I lock generator to trailer with to stop honest people when its running. Not sure how I will proceed.
