Center of Mass Trajectory

This command allows to calculate and visualize by a 2D or 3D sketch, the center of mass trajectory of several rigid groups during a simulation. This command specially allows to see if a simulation center of mass is limited in its supports.....

Creation stages / Use:

Click the icon or select the Simulation > Center of Mass Trajectory... command from the drop-down menu.

Select the simulation.
Click Refresh if the button is not grayed out. The button is grayed out when the simulation is updated. Refreshes can also be run from the entities tree.
Select rigid groups to take into account.
Select the type of sketch to generate. If this is a planar sketch, select its plane. If this is a spatial sketch, there is no plane to select.
Validate by clicking .

You cannot modify the trajectory type (basified or not) after the validation.
An associative trajectory is only visible in the mechanism stage. In the modeling stage, it is grayed out.
When selecting the origin of the trajectory, the design configuration is updated up to the validation of the command. When displaying the trajectory, the chosen configuration is updated again.

A trajectory is a polyline. The number of points is defined in the simulation, by the number of points per second. The greater the number of points, the more exact the trajectory, but the calculation time will also be longer.

Available Options:

Basify:

The trajectory can be either associative, and therefore recalculated when the mechanism is changed, or by checking Basify, produce an editable sketch at the modeling stage that may be used.

Advanced options:

Filtering: Filtering allows you to delete merged and aligned points on the trajectory.
- Angle: TopSolid will create 2 lines with 3 successive points. If the angle between these 2 lines is less than the angle entered, TopSolid considers that the points are aligned and deletes the intermediate points in order to create one line instead of different segments.

- Distance: If the distance between the points is less than the distance entered, TopSolid considers that the points are merged and deletes useless points. During simulation, the point used to create the trajectory cannot move for a moment, in this case points will overlap.

Smoothing: If the points can be registered on a curve, the polyline will be replaced by arcs or splines.
- Angle: Smoothing can be done under this angle. Above, TopSolid considers it as an acute angle.

- Distance: If the distance between the points is registered on an arc, TopSolid can replace the polyline with an arc.

- Tolerance: The polyline is smoothed by interpolation for the given tolerance. (arcs and lines).

- Splines: Allows TopSolid to replace arcs and lines by splines.

Cleaning: If 2 colinear segments and end to end, with each a length lower than the entered value , then these 2 segments will be replace by one with the length of both.

	"Raw" Trajectory: Obtained result without filtering or smoothing.
	Trajectory with Angle Filtering: If angle "a" between the 2 lines is less than the angle entered, the polyline will be replace by a line.
	Trajectory with Distance Filtering: If distance "d" is less than the distance entered, the points are considered as merged and deleted (in yellow on the image).
	Trajectory with Angular Smoothing: If the points of the polyline are registered on a curve and that angle "a" between 2 lines is less than the angle entered, the polyline will be smoothed. (On the image, the section with the yellow points is smoothed).
	Trajectory with Distance Smoothing: If the distance between the points is registered on an arc, the polyline will be replaced by an arc. (On the image, the section with the yellow points is replaced by an arc).
	Trajectory with Tolerance Smoothing: The polyline is converted to spline by interpolation regarding to the entered tolerance.

These options are as useful for planar sketches as for spatial sketches.