Hello,
My question is whether NEC or other standards prohibit this design choice:
We have an industrial electrical cabinet that receives 480V power from an electrical drop. There is a knife switch disconnect that kills power to the whole cabinet. We would like to be able to disconnect just the...
Hello, I am working on a small to medium-sized automation system, and I am currently writing the commissioning procedures, particularly ones related to functional safety. I am somewhat new to it.
The procedure I have written out is based on some examples I found while searching the internet...
Hi, I am working on a project with thin-walled aluminum extrusions (4" x 4" x 1/8" x 6' LG) that are bolted to a large machine that produces a lot of vibration. The concern (not yet proven, but suspected) is that the tubes will act as an acoustic chamber and produce a lot of nuisance noise...
Hello, I work in a small R&D lab. Our CTO had our technician set up a lifting point using a concrete beam in the ceiling of our lab (a week when I was out). I would like to validate the strength of this setup to make sure it is safe, since it was done very ad-hoc.
The setup is a 3/4"-10 double...
Hello,
I am dealing with a sealed, welded box beam (~8" x 8" x 36", 8mm wall thickness, low carbon structural steel) which acts as the backbone of a chassis frame. At some point, some small #6 tapped holes were drilled through the beam to mount a bracket. We have discovered, during a repair...
Hello,
I am dealing with a sealed, welded box beam (~8" x 8" x 36", 8mm wall thickness, low carbon structural steel) which acts as the backbone of a chassis frame. At some point, some small #6 tapped holes were drilled through the beam to mount a bracket. We have discovered, during a repair...
Hello all, I am analyzing a design that involves a stainless steel tube in bending. This tube is reinforced with a smaller "doubler tube" snugly fit inside (its OD being equal to the larger tube's ID). The tubes are not bonded, and are free to slide, ignoring friction. I have scoured the...
Hello all,
I have never been able to find a satisfying answer for this question: when determining allowable fatigue stress ranges with Marin factors (e.g. per Shigley), how do you apply the "size factor" to FEA results?
The purpose of the size factor seems to be to take into account material...
Hello all,
the is x-posted from Vibrations Engineering, hope that is OK.
I am working on an analysis of a large chassis frame for an autonomous vehicle. We are validating the performance capabilities of the system using vehicle-mounted accelerometers. The raw data that we are collecting is...
Hello all,
I am working on an analysis of a large chassis frame for an autonomous vehicle. We are validating the performance capabilities of the system using vehicle-mounted accelerometers. The raw data that we are collecting is filled with intermittent high-amplitude noise, most likely due...
Hello all,
We are purchasing a 6-ton spreader beam for heavy overhead lifting, to be provided to a customer in Dubai. Being a new engineer, I am somewhat ignorant of lifting standards, and how they are affected by local law.
The American standard for below-the-hook lifting devices is ASME...
Hello all,
I have been tasked with modeling a pair of parallel I-beams, which together support a steel plate that rests between their flanges. Since, ultimately, a bus will be driven over the steel plate, the I-beams are not sufficiently stiff to support the plate in their unmodified state...
