Angular velocity in global or body local frame
Posted: Tue Jul 21, 2020 2:30 am
Hi there,
In the Analyse tool, the setup file of Body kinematics shows we can decide to express the result in global or body local frame. But when I found at the top of result file, it always write"Angular velocities and accelerations are given about the body-local axes." whether at global file or bodylocal file. I want to confirm does angular velocity expressed in global coordinates when I choose to express results in global frame?
In the Analyse tool, the setup file of Body kinematics shows we can decide to express the result in global or body local frame. But when I found at the top of result file, it always write"Angular velocities and accelerations are given about the body-local axes." whether at global file or bodylocal file. I want to confirm does angular velocity expressed in global coordinates when I choose to express results in global frame?
<BodyKinematics name="BodyKinematics">
<!--Flag (true or false) specifying whether on. True by default.-->
<on>true</on>
<!--Start time.-->
<start_time>0</start_time>
<!--End time.-->
<end_time>248.34</end_time>
<!--Specifies how often to store results during a simulation. More specifically, the interval (a positive integer) specifies how many successful integration steps should be taken before results are recorded again.-->
<step_interval>1</step_interval>
<!--Flag (true or false) indicating whether the results are in degrees or not.-->
<in_degrees>false</in_degrees>
<!--Names of bodies to record kinematics for. Use 'all' to record all bodies. The special name 'center_of_mass' refers to the combined center of mass.-->
<bodies> all</bodies>
<!--Flag (true or false) indicating whether to express results in the global frame or local-frames of the bodies. Body positions and center of mass results are always given in the global frame. This flag is set to false by default.-->
<express_results_in_body_local_frame>true</express_results_in_body_local_frame>
</BodyKinematics>