Sketch Cosine Function Curve

[Jim0914]

Hi Everyone -

I am looking for the best way to sketch/plot points/etc the following function:

X = -.15/2 * COS(360 * 4 * Y) + .15/2

This curve will be attached to a profile that will be swept. I am looking for the smartest and best way to do this. I don't know how to apply this to a 'curve'. My first thought is to create parametric points and run a spline thru them but accuracy is important. The more points I have the more accurate the curve.

Someone has to have done this before. Can someone direct me how to proceed please? I'd appreciate any and all suggestions/ideas.

Thanks In Advance.

Jim Weisner
Senior Designer
General Electric Company
NX V12.0.1 MP02

 

[JohnRBaker]

There is a function in NX that allows you to define a curve using a formula. I believe it's under what's called a 'Law Curve'. Check it out.

John R. Baker, P.E. (ret)
EX-Product 'Evangelist'
Irvine, CA
Siemens PLM:
UG/NX Museum:

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[Toost]

John is correct.
to do this, first open the Expression Editor ( Ctrl+E)
then create the necessary equations.
FIRST create the Y equation because the Y is referred in the X equation.
( NX does not like equations that refers to unknown variables, Y has to resolve into something usable for the X equation.)
When defining the law curve , you will also need to define the Z values, but that can be set to constant = 0 in the dialog.
Math is not my "home turf", but, I think it's correct to say that you need to define the equation as a "parametric " using a variable "t" that NX varies between 0 and 1.
( else we get a single value from each equation.)
In the dialog NX will by default propose the variables Xt, Yt, Zt and t ( "X" as a function of "t")

There are in the reuse library a number of examples to look at
The image below is from a later NX version than NX12 but the content is the same in NX12.
Right-click - Open one of these and press Ctrl E to see the how they have done the expressions.

Regards,
Tomas


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[mmauldin]

Is this what you are trying to accomplish? If so, I will explain more if needed.