Recent content by BrianE22

So EdS - the hysteresis you are referring to is the stress/strain loop and the area enclosed by the loop?

Cast iron damps real well. Aluminum rings and rings. What causes damping in metal materials?

Wouldn't a teeter totter do what you want?

We're going crazy in our small office/assembly area with the unwanted spam or junk phone calls. What I'd ideally find would be a COTS program/electronics package that I could add to our 3 computers. I'm sure I can't find anything with all that I'd like so maybe I hire an engineer to build and...

I'm confused on the fastener being aluminum or steel? We've fastened aluminum parts together with zinc plated screws for >60 years. I've not seen one come back loose. If you plan on disassembly and reassembly then use inserts and/or thread lubricant.

Look at Micro Measurements. Years ago they sent me a very comprehensive binder of their gauges and tutorials on strain gauges.

Do you need to accurately hold the sheet metal pieces together during rotation? If so then you'll probably need at least one bearing. Does the center bolt need preload only to keep the nut from falling off? If so then a shoulder bolt and nut would probably be enough.

Did you watch the assembly or do it yourself? Perhaps something was off and a lot of stress induced during the assembly.

I think you want a notch filter. Piezos are generally good at high frequencies (high output) and not so good at low frequencies (low output). I don't think you want to build a notch filter with them. Are you looking to filter a "drive signal" for a test rig? When I did this kind of stuff...

I assume there's a flexible coupling between motor and gear box?

What minimum and maximum pressures for the tank are you dealing with?

Spherical mounts for two or three of the actuators and piston rods may help.

Thought of another one I've messed up before: Are using a ground plane on the PCB? If so, you don't have AC low connected to DC low, correct?

A lot of work but... build half the circuit on the PCB and the other half in the breadboard. Add/subtract the components to each until you get what you want. That will at least isolate what section of the circuit isn't working as expected on the PCB.

Just FYI, McMaster sells angle brackets. They have large filleted radii (no welds). They are also cast iron (damps well) https://www.mcmaster.com/products/angle-plates/angle-plates-2~/ Bob