Errors inputting formula for equation curve

dunleavy_liam — Tue, 23 Apr 2024 11:51:20 GMT

I'm trying to input this parametric equation as a curve in an inventor sketch:

x(t) = (1/sqrt((cos(t)/HorizontalDiameter)^2)+(sin(t)/VerticalDiameter)^2))+VentSlope*(t+StartAngle)+VentWidth+2*WallThickness)*cos(t)

y(t) = (1/sqrt((cos(t)/HorizontalDiameter)^2)+(sin(t)/VerticalDiameter)^2))+VentSlope*(t+StartAngle)+VentWidth+2*WallThickness)*sin(t)+Kvalue

HorizontalDiameter, VerticalDiameter, and KValue are all reference parameters with mm units. StartAngle is a reference angle with deg units. All other parameters are user based in mms

No matter what I do (Reformatting the equation such as VentSlope*t+VentSlope*StartAngle instead of VentSlope*(t+StartAngle), isolating parameters to convert units i.e. StartAngle from deg -> ul or VentSlope from mm -> ul, etc.) Inventor throws some kind of error, usually either "Expected units are length" or "The curve is irregular from parameter {a} to {b}"+"Generic problem caused by the equation". As shown in the image, when the curve is actually graphed, there are no issues, so it's not a mathematical error. How am I supposed to input this?

Відповідь: Errors inputting formula for equation curve

Alexander_Chernikov — Tue, 23 Apr 2024 19:14:29 GMT

There are several errors with extra brackets, variable name (register) and units.

Equations that works:

x(t):

(1/sqrt((cos(t)/HorizontalDiameter)^2+(sin(t)/VerticalDiameter)^2)+VentSlope*(t+StartAngle / 1 deg)+VentWidth+2*WallThickness)*cos(t)

y(t):

(1/sqrt((cos(t)/HorizontalDiameter)^2+(sin(t)/VerticalDiameter)^2)+VentSlope*(t+StartAngle/1deg)+VentWidth+2*WallThickness)*sin(t)+KValue

The file is added (in IV2023)

topic Відповідь: Errors inputting formula for equation curve in Inventor Forum

Errors inputting formula for equation curve

Відповідь: Errors inputting formula for equation curve