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measure create angle

This command will create a new angle measure.

Format:

 

measure create angle
measure_name=	new mea_angle
first_point=	existing marker
middle_point=	existing marker
last_point=	existing marker
comments=	string
legend=	string

Example:

 

measure create angle
measure_name=	angle_between_link1_link2
first_point =	marker_2
last_point =	marker_4
middle_point =	marker_1
legend =	"angle between two links"
comments =	"this measure will track the angle between the two links"

If Link1 and Link2 are connected by a revolute joint and Marker2 lies on Link1, Marker 3 lies on Link2 and Marker 1 lies in the intersection of Link1 and Link2, then the above command will create an angle measure to compute the angle between the two links. The title of the measure will be the string specified in the legend parameter.

Description:

 

Parameter	Value Type	Description
measure_name	New Meaure name	Specifies the name of the angle measure. You can use this name later to specify this new angle measure created.
first_point	Existing marker	Specifies an existing marker on an entity.
middle_point	Existing marker	Specifies an existing marker on an entity.
last_point	Existing marker	Specifies an existing marker on an entity.
Legend	String	Specifies the text that will appear at the top of the Angle measure.
Comments	String	Specifies any comments that are to be associated with this angle measure.

Extended Definition:

1.	About Measuring Included Angle Characteristics

The included angle measure captures the instantaneous angle between two vectors defined by three markers. For example, you can use the angle measure to find the included angle between any two links connected by a revolute joint. The default unit for angle measures is degrees.

To create an included angle, you select three markers, as illustrated in the figure below. These three markers define two vectors:

It is the instantaneous angle between these vectors that Adams/View tracks in an included angle measure. Note that the included angle changes over time as the markers move during a simulation.

Example of Points That Define Included Angles

There are two conventions used in Adams/View to define the sign and magnitude of an included angle measure as it changes over time:

2.	The sign and magnitude is always calculated so as to have an initial value within the range [0, PI] regardless of the order in which you select the points.

3.	The axis of rotation is automatically calculated as the cross-product of, which is sensitive to the order in which you select the points. This, along with the right-hand rule, determines all subsequent changes to the sign and magnitude of the included angle measure.