Okay, so looking back at the post you linked with the math, I see where my confusion is now. The math and the method you are talking about requires an index position of the rotor and phase information. We don't currently have that index marker, but can reconfigure our data system to include it...
There is no balancing grade specified, but the maximum bearing vibration is specified at 0.12ips peak. The rotor weighs about 10,000 lb and is rated up to 2,000 RPM.
We recorded a bearing vibration of 0.14ips for 2 seconds when we tried to spin up to 1,500 RPM before the PLC shut it down. At...
Gotcha. So we have vibration recordings from both planes at the same time, that's no problem.
Thank you very much for the link to the other topic, that helps explain what is going on in the math some. And brings up one important point I hadn't thought of... So the trial weights needs to be...
I appreciate the input, that is probably what we will end up doing if a second attempt does not go well.
But the intent of this post was to learn more about the process of balancing a rotor and to find out if balancing in position on fluid film bearings requires a different procedure or...
I suppose that may be the issue then, just need to do a real 2 plane balance. It certainly makes sense how an imbalance on one end would show vibrations on the other end.
I will say my balancing experience has either been with a dynamic balancing machine where the calculations are done for you...
Supposedly they called in a motor repair and maintenance company and they attempted to balance it after they did other maintenance like replacing the bearing journals and some tuning on the drives, but did not do it properly because the vibration were not any better. Or so I have been told, that...
Hello all, looking for some advice, tips, and suggestions here. We have two large 8600 horsepower motors where I work and we are having some vibration problems from them. Have been for a long time, but nobody has ever bothered to try to fix it because it worked good enough and ran without...
Oh okay, awesome! So functionally it would work fine and not overheat or draw too much current or anything bad, just would have half the kVA rating? Which would be fine because it's rating is a little over double what my machine requires. Awesome!
Hi all, I found a really good deal on a 480v drive isolation transformer but my service is 240v.
My question is since it is just a 1:1 isolation transformer, could it be used on 240v service?
Initially I thought yes, but then I got to thinking the inductance may be different and it would pull...
Possibly so I suppose. Indeed the pressure would likely be higher the deeper you go. But I wouldn't think it would be enough to matter. Soil is more or less a solid where air is a fluid. I mean, it's no harder to drill a hole at the bottom of a concrete wall that is 20ft tall vs the top. I may...
I think I have a decent understanding of the concept behind how helical piles work, but what I am struggling to understand is how the installation torque translates to a load bearing capacity. I know it's different for each size pile probably, but how can torque tell you bearing capacity? It...
Can anyone help me understand how or what the structural error plot is showing in the static structural mechanical solver? I know it's error between the averages of nodes but how is it displayed? The units say mJ so energy? I'm used to solidworks displaying it as a percent error. How would I...
Yes, it would indeed be a non engineered landscape wall. And yes, basically a mortar substitute? Could a construction adhesive achieve the same or better bonding characteristics as mortar basically.
Indeed mortar is very cheap, but it's substantially more labor intensive and more specialized...
Thank you very much for your reply!
"Which equation are you specifically struggling with? Bond strength is probably something like (Phi.ws*K.ws) * (Lambda.a*Tau.cr*Pi*d.a*h.ef) modified by geometry and edge effects. Almost all of these terms come from the tables in the ESR."
It's more so where...
I am hoping to find some sort of adhesive to replace mortar in an application for a free standing decorative patio wall. I plan to do the work myself, so mixing mortar and laying blocks will be quite intensive and time consuming. I was wondering if anyone could suggest a construction adhesive...
