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Interesting. Stumbled on this when looking at some of the vibration meter offerings. This is a USB accelerometer that you plug into your phone or laptop. About $800 but you can use a lot of apps and software which might make it more versatile. And can go down to 2 Hz...

Thanks!

So does the unit you have measure acceleration, velocity, and displacement? If you have a model number that would be great. I see several versions online. And I often deal with crushers and feeders that operate below 10Hz but this tool sounds useful even if only for the cases with machines...

Yes, field measurements. The LANDTEK device sounds useful. I'll check them out. I've got a couple accelerometers and a Dewesoft data collector that I've been trying to learn but the user interface and the online help is not great.

Those of you that are measuring displacements and accelerations, what software/hardware are you using? Or are you using 3rd party to gather data?

I would guess it means a 6 pole 50 Hz motor on the machine. Then there is a load cycling at 16 Hz. What is the machine?

For the covers I'm looking at the uplift is larger than the dead load of the cover since they are made of 22 gauge steel. It has an effect on the foundation by adding another projected surface for wind load shear and reducing the gravity load resisting overturning. Thanks. I have tabulated...

I'm looking for some opinions and approaches for methods of calculating wind loads on conveyor trusses and more specifically the arched belt "covers" that are sometimes attached to the truss. See the pictures for what I'm talking about. Currently we are using ASCE 7-10 Figure 27.4-3 for...

I use them as little as possible but have used them enough to know they can create concentrated moments. In my experience they function exactly the same as manually creating a rigid link between beam centerlines.

Understood and thank you for the feedback. That seems reasonable and is achievable in my case. Thanks.

I've done that and it's okay. I guess beyond that I'll double check that the bracing meets the AISC bracing strength and stiffness requirements for column bracing. I guess my confusion is whether the second order analysis in RISA captures the global stability under lateral loads. I thought...

Hello all, I am working on the design of the structure shown in the attached sketch. I have modeled the structure and done a second order analysis in RISA 3D. I don't have any issues with the model stability but I am trying to verify the global buckling with a hand check. For each mast I...

dvd, Points A and B are chosen based on the strength of the truss and to minimize cable force and truss deflection. For example, Point A would be chosen based on the cantilever strength and deflection limits of the head of the conveyor, while also trying to maximize the "vertical-ness" of the...

Denial, I don't think you are missing anything. That is essentially the process I've been going for, short of generalizing the spreadsheet for number and location of rope attachment points. rb, I'm not sure what the correct terminology is. I've heard it called 'parts of line'. Ten parts of...

Dik, Winch is located at C in the sketch. I was planning on reaving multiple part line at points A and B based on tributary load and then going back over the support to the winch location and anchoring on the frame or such to get 2T at that point.

I'm looking at the following scenario, conceptual sketch attached. A conveyor is pinned at the tail and will be inclined/declined using a winch and wire rope system. The wire rope will attach at at least a couple points along the conveyor and will be supported from a central mast that will...

Thanks for all of the confirmations. I knew I didn't like the connection but I like to have a good reason for dismissing a contractor's request. Those are some pretty useful connectors posted above if I had two angles. I also considered drilling an extra hole and using a large U-bolt but at...

Has anyone "designed" a hanger like shown in the attached sketch? I've seen them used occasionally in mine processing plants but I assumed they were just remnants of decades old practices. I've been asked to use this concept to support a walkway stringer from the bottom chord of a box truss...

I'm told the software can remove the base motion of the camera itself. I was aware that the technology was available, but I didn't realize it was as easy to deploy and interpret as the RDI videos make it seem. I'm sure there is a learning curve with the software (frequency filtering, vector...

**I considered posting this in the Mechanical>Acoustics & Vibration forum but I think I'll get more input here. I'm looking for any opinions/experiences but specifically from structural engineers if there are any.** I've recently started looking into motion amplification camera technology to...