calculation of a pneumatic cylinder

[Samuele Bigolin]

Hello everyone, I'm developing a thesis for graduation, and I'm trying to calculate the decelling constants of a cylinder, having 40mm alege and 125mm stroke, caused by the amortizzi. do you know if there are formulas, read for the calculation of parameters due to the ammortizzo? ? ?

 

[reb_bl]

if you can be useful there are many programs that calculate them, maybe take a look at the site ace or festo or smc.

 

[Samuele Bigolin]

I have already looked at all those sites and software but I have found nothing that can approach what is needed to me, I was looking for a law or some suggestions to get analytical procedure

 

[exxon]

laws are those of accelerated straight motion (s = s + v·t + 1⁄2·a·t2) and dynamics (f = m·a).
They always do.

p.s. in the thesis write "decelerated" with only one 'l'.

 

[Samuele Bigolin]

laws are those of accelerated straight motion (s = s + v·t + 1⁄2·a·t2) and dynamics (f = m·a).
They always do.

p.s. in the thesis write "decelerated" with only one 'l'.

I thought I'd use the demortized harmonic motion law without taking into account the spring component, can it be correct?

 

[cacciatorino]

laws are those of accelerated straight motion (s = s + v·t + 1⁄2·a·t2) and dynamics (f = m·a).
They always do.

p.s. in the thesis write "decelerated" with only one 'l'.

probably refers to braking systems inserted by manufacturers in pneumatic actuators, which are viscous systems (use of strozzatures on air outlet channels from the emptying chamber). Mathematical treatment I think is very complex, it would be useful to know the final purpose to perhaps better understand the problem.

 

[exxon]

In this case the laws are those of fluid dynamics, but as you rightly say, I don't think they are actually applicable.

 

[exxon]

I thought I'd use the demortized harmonic motion law without taking into account the spring component, can it be correct?

a harmonic motion without spring is no longer such... but if you want to analyze also that type of dynamics (the speed oscillations of the stem at the change of regime from uniform straight to decelerated), then you have a real mountain!

the spring, however you always have it because it is given by the compression of the gas.

 

[Samuele Bigolin]

in a few words I was asked to do a cinematic and dynamic analysis of a pressure manovellism driven by a pneumatic cylinder (i.e. the cylinder is in position 0° connected to a rack that turns a toothed wheel to which is attached handle and biella) after doing all the analysis with the data provided by the producers or constant forces of thrust etc. came out a little real value since they come into play decellerations due to Now I looked everywhere on the internet something nervous but I found nothing then I was trying to get analytically a constant depreciation of the bike that makes me approach the real values

 

[cacciatorino]

in a few words I was asked to do a cinematic and dynamic analysis of a pressure manovellism driven by a pneumatic cylinder (i.e. the cylinder is in position 0° connected to a rack that turns a toothed wheel to which is attached handle and biella) after doing all the analysis with the data provided by the producers or constant forces of thrust etc. came out a little real value since they come into play decellerations due to Now I looked everywhere on the internet something nervous but I found nothing then I was trying to get analytically a constant depreciation of the bike that makes me approach the real values

according to me are data that exist: I would try to call the party, explaining that you're doing a thesis in engineering and that you need this.

 

[Samuele Bigolin]

according to me are data that exist: I would try to call the party, explaining that you're doing a thesis in engineering and that you need this.

I could also do this, but if I could find analytical law, maybe I could be useful in the future all here.

 

[exxon]

...after doing all the analysis with the data provided by producers or constant forces of thrust etc. came out a little real value

What value did not come out?

... I was trying to get myself analytically a constant depreciation of the motion that makes me approach the real values

What values?

the analytical calculation of dynamics in the deceleration phase is extremely complex because the rate of efflux of a gas from an orifice is a non-linear function and depends on the type of motion (laminating or turbulent), and other factors almost impossible to obtain analytically.

if the object of the thesis is not this specific analysis, then consider the cylinder motion divided into distinct parts and do a separate analysis in the acceleration zones, possible uniform motion and deceleration. constants (which are not constant if not with a consistent simplification. ..) you find them in the literature of the builders as the hunter told you.

 

[Samuele Bigolin]

And if I had the energy absorption of the ammo, would I get something?

 

[exxon]

depends on what you're looking for. e = f·s, so if you know how to move in the deceleration phase, you can get your strength media, but not dynamics (understood as speed trend over time).