Tomas Sabaliauskas

9 Questions 38 Answers 0 Followers

Questions related from Tomas Sabaliauskas

How to synchronize two stepper motors most optimally?

We need to push a large load (2 tones) using two stepper motors, connected rigidly to the axis (two screws). I'm worried the motors could micro-step out of sync. And cause malfunction. I can see...

22 October 2020 6,721 4 View

Supplier for large robot components (screw rod, 4m long)?

We're making something special for the lab. We need a 4m long linear rail, that can push 27kN at 20mm/s speed. Two NEMA 42 motors with a screw could deliver the performance. It's hard to find a...

12 October 2020 964 4 View

Three stage servo valve. What are the benefits?

What are the benefits of a three stage servo valve, controlling a hydraulic piston? It uses a second spool, so I'd expect additional hydraulic losses (reduced piston velocity?). I suppose some...

19 February 2019 6,724 13 View

Strain controlled fatigue tests?

I'm working in geotechnics. We are testing "fatigue" response of cyclic loaded sand, where deformation cycles (or strain cycles) of constant amplitude are applied. I need references to research...

23 May 2018 4,066 2 View

Non-cavitating fluid... what is the closest thing to non-cavitating fluid?

Even ultra low vacuum grease evaporates near absolute vacuum. Cavitation takes place when pressure drops near absolute zero pressure, near -100 kPa, -1 atm... when the "vapor pressure" limit is...

23 January 2018 4,121 6 View

Strain space plasticity? Strain space soil models?

I have come across work of P.J. Yoder (1980) (A strain-space plasticity theory and numerical implementation). He made a strain-space equivalent to pure plastic Coulomb model. His model has the...

11 July 2016 936 9 View

Paradigm shift. What to do if observations fundamentally contradict convention

Asked 3 minutes ago I have a problem. Measurements show the opposite of what convention assumes. It occurred in geotechnics, but could affect all material modelling branches. I tested soil...

01 January 1970 4,936 3 View

Large strain compatible FEM (20% strain range)?

I am trying to make a sand model, which captures liquefaction / post-liquefaction recovery around a structure. We have the laboratory results and measurements, but to use them a model stable at...

01 January 1970 976 3 View

Paradigm shift. What to do if you the observations contradict the convention?

I have a problem. Measurements show the opposite of what convention assumes. I test soil specimens. We try to decode how much deformation a certain loading (force) sequence will generate. After...

01 January 1970 5,255 4 View