Trajpar

trajpar is a system parameter in Pro/ENGINEER that varies from 0 to 1 across the length of a given path. It is used to create complex geometric and non-geometric shapes that vary in dimension along the length of any given path.

Naming

trajpar derives from the words: "traj"ectory "par"ameter. It is a pseudo-variable as it is controlled not by any mathematical representation, but by the physical representation of a path, i.e. a "trajectory".

yntax

sd3=evalgraph('graph1',trajpar*100) Where sd3= A variable inside the variable section sweep that will be driven by a graph feature called 'graph1'

Uses and notability

trajpar can be used with various mathematical functions to create alternating, flaring, bowing or sinusoidal protrusions. It is primarily used in conjunction with the "variable section sweep" command in Pro/ENGINEER but can also remove material if desired.

trajpar typifies what makes Pro/ENGINEER different from many other CAD software systems. The level of complexity and control given to the user is much greater than, for example, SolidWorks or Alias

amples

To create an undulating wave, a sinusoid might be desired::$d1=sin(trajpar\; cdot\; 8pi)$

A flare::$d1=1\; +\; trajpar^2$

etc., where d1 is the dimension to be controlled.

ee also

*Pro/ENGINEER
*SolidWorks
*Unigraphics
*AutoCAD

External links

*cite web| url= http://www.profilesmagazine.com/p23/tips_mcdougall.html |title=Creating a Constant Cross-Section Twist|work= Profiles Magazine|author=McDougall, John of EMS Technologies|accessdate= 2006-06-27|date=Spring, 2006