Adams Basic Package > Adams View > View Command Language > part > part create external_system initial_velocity

part create external_system initial_velocity

Allows you to create initial velocities on an existing external system part.

Format:

part create external_system initial_velocity
external_system_name =	an existing part
vm =	existing marker
wm =	existing marker
vx =	velocity
no_vx =	true_only
vy =	velocity
no_vy =	true_only
vz =	velocity
no_vz=	true_only
wx =	angular_vel
no_wx =	true_only
wy =	angular_vel
no_wy =	true_only
wz =	angular_vel
no_wz =	true_only

Example:

part create external_system initial_velocity &
external_system_name=	external_system_1 &
vm =	cm &
wm =	marker_1 &
vx =	1.02 &
vy =	1.01 &
vz =	1.05 &
no_wz =	true

Description:

Parameter	Value Type	Description
external_system_name	Existing external system	You use this parameter to identify the existing external system part to affect with this command.
vm	Existing marker	Specifies the marker representing the translational velocity.
wm	Existing marker	Specifies the marker representing the rotational velocity about it.
vx	Velocity	Specifies the initial translational velocity of the center-of-mass marker along the x-axis of the ground reference frame.
no_vx	True_only	Specifies to "UNSET" the "vx" velocity initial condition for the specified part, if set.
vy	Velocity	Specifies the initial translational velocity of the center-of-mass marker along the y-axis of the ground reference frame.
no_vy	True_only	Specifies to "UNSET" the "vy" velocity initial condition for the specified part, if set.
vz	Velocity	Specifies the initial translational velocity of the center-of-mass marker along the z-axis of the ground reference frame.
no_vz	True_only	This is not the same as setting the value to zero. A zero velocity is not the same as "no" velocity. Therefore, by setting this parameter to true there is no longer a velocity initial condition for this element.
wx	Angular_velocity	Specifies the initial rotational velocity of the center-of-mass marker about its x-axis.
no_wx	True_only	Specifies to "UNSET" the "wx" angular_velocity initial condition for the specified part, if set.
wy	Angular_velocity	Specifies the initial rotational velocity of the center-of-mass marker about its y-axis.
no_wy	True_only	Specifies to "UNSET" the "wy" angular_velocity initial condition for the specified part, if set.
wz	Angular_velocity	Specifies the initial rotational velocity of the center-of-mass marker about its z-axis.
no_wz	True_only	Specifies to "UNSET" the "wz" angular_velocity initial condition for the specified part, if set.

Extended Definition:

1. Translational velocities are specified by parameters VX, VY, and VZ.

Rotational velocities are specified by parameters WX, WY, and WZ.

Note:

The initial translational velocities are with respect to the ground coordinate axes, while the initial rotational velocities are with respect to the center-of-mass marker axes.

2. You may identify an external system by typing its name or by picking it from the screen.

a. If the external system part is not visible on the screen, you must type the name. You may also find it convenient to type the name even if the part is displayed.

b. If you created the part by reading an Adams data set or graphics file, the part name is the letters PAR followed by the Adams data set part ID number. For example, the name of Adams PART/101 is PAR101.

c. If you created the part during preprocessing, you will have given it a name at that time.

d. If a part is available by default, you may identify it by entering only its name. If it is not, you must enter its full name. To identify a part under another model, for instance, you may need to enter the model name as well. For example, you may specify part 'arm' from model 'robot' by entering ".robot.arm". If you type a "?", Adams View will list the parts available by default.

e. You must separate multiple part names by commas. If the part is visible in one of your views, you may identify it by picking on any of the graphics associated with it.

f. You need not separate multiple part picks by commas.

3. Note that the initial translational velocities are with respect to the ground coordinate axes, while the initial rotational velocities are with respect to the center-of-mass marker axes.

4. Setting no_vx or no_vy or no_vz is not the same as setting the corresponding velocity value to zero. A zero velocity is not the same as "no" velocity. Therefore, when this parameter is set to true, there is no longer a velocity initial condition for this element.

5. Setting no_wx, no_wy, no_wz is not the same as setting the corresponding angular velocity value to zero. A zero angular_velocity is not the same as "no" angular_velocity. Therefore, when this parameter is set to true, there is no longer an angular_velocity initial condition for this element.