6th order polynomial equation as pressure load

Adrunodro

Hi,

I have fitted a 6th order polynomial to a set of points and I want to use it as a pressure equation on one face of a propeller blade. The exact equation i'm writing in the box next to equation is this one:
-1.0157e(-16)*y^6+1.0721e(-13)*y^5-4.1705e(-11)*y^4+6.6163e(-09)*y^3-2.5475e(-07)*y^2-8.5948e(-06)*y+1.2454e(-03)

which has a maximum value of 0.0036 in the interval (0,350)

My model is in mm, RHO=2.781e-9 and E=70,000 so I think using MPa is consistent but I get 0 displacement and 0 errors

what's the problem?

I'm attaching a screenshot with my pressure load settings

Adriano Koga_20259

try removing the ().

-1.0157e-16*y^6+1.0721e-13*y^5-4.1705e-11*y^4+6.6163e-09*y^3-2.5475e-07*y^2-8.5948e-06*y+1.2454e-3

QuyNguyenDai

I have some issue with complicated equation too. Finally I have to write a small Tcl script to make pressure myself.

Adrunodro

Q.Nguyen-Dai said:

I have some issue with complicated equation too. Finally I have to write a small Tcl script to make pressure myself.

Thanks Q.Nguyen-Dai but that sound to me more like a problem than a solution

Adriano Koga_20259

try removing the ().

-1.0157e-16*y^6+1.0721e-13*y^5-4.1705e-11*y^4+6.6163e-09*y^3-2.5475e-07*y^2-8.5948e-06*y+1.2454e-3

Adrunodro

Adriano Koga_20259 said:

try removing the ().

-1.0157e-16*y^6+1.0721e-13*y^5-4.1705e-11*y^4+6.6163e-09*y^3-2.5475e-07*y^2-8.5948e-06*y+1.2454e-3

Wonderful, Adriano. That solved my problem!

Thank you both!

Vladimir Gantovnik_21974

Is it possible to do it using tcl?