constraint modify joint revolute
Allows the modification of a revolute joint.
Format:
constraint modify joint revolute |
|---|
joint_name = | existing joint |
new_joint_name = | new joint |
adams_id = | geom._id |
comments = | string |
rotational_ic = | angle |
no_rotational_ic = | true |
angular_velocity_ic = | angular_vel |
no_angular_velocity_ic = | true |
friction_enabled = | enable_friction |
delta_v = | real |
maximum_deformation = | real |
mu_dyn_rot = | real |
mu_stat_rot = | real |
max_fric_rot = | torque |
preload_radial = | force |
preload_axial = | force |
inner_radius = | length |
outer_radius = | length |
relative_to = | existing model, part or marker |
i_marker_name = | existing marker |
j_marker_name = | existing marker |
Example:
constraint modify joint Revolute & |
|---|
joint_name = | .model_1.JOINT_1 & |
neW_joint_name = | MY_REVOLUTE_JOINT & |
adams_id = | 1 & |
i_marker_name = | .model_1.PART_2.MARKER_5 & |
j_marker_name = | .model_1.PART_3.MARKER_6 |
Description:
Parameter | Value Type | Description |
|---|
joint_name | Existing joint | Specifies the name of the joint to be modified. You may use this name later to refer to this joint. |
New_joint_name | New joint name | Specified the name of the new joint. |
adams_id | Integer | Specifies an integer used to identify this element in the Adams data file. |
comments | String | Specifies comments for the object being created or modified. |
rotational_ic | Real | Specifies the initial rotational displacement on a revolute or cylindrical joint. |
no_rotational_ic | True | Specifies that if a "rotational" velocity initial condition has been set, to "UNSET" the "rotational" velocity initial condition for the specified constraint. |
angular_velocity_ic | Real | Specifies the initial angular velocity on a revolute or cylindrical joint. |
no_angular_velocity_ic | True | Specifies that if an "angular_velocity" initial condition has been set, to "UNSET" the "angular_velocity" initial condition for the specified constraint. |
friction_enabled | Yes/No/Preload_only | The constant default value will be used if this parameter is omitted. |
delta_v | Real | Real number should be greater than zero. |
maximum_deformation | Real | Real number should be greater than zero. |
mu_dyn_rot | Real | A real number greater than or equal to 0 |
mu_stat_rot | Real | A real number greater than or equal to 0 |
max_fric_rot | Torque | A real number greater than or equal to 0 |
preload_radial | Force | A real number greater than or equal to 0 |
preload_axial | Force | A real number greater than or equal to 0 |
inner_radius | Length | A real number greater than or equal to 0 |
outer_radius | Length | A real number greater than or equal to 0 |
relative_to | Existing model, part or marker | Specifies the coordinate system that location coordinates and orientation angles are with respect to. |
i_marker_name | Existing marker | Specifies a marker on the first of two parts connected by this joint. Adams View connects one part at the I marker to the other at the J marker. |
j_marker_name | Existing marker | Specifies a marker on the second of two parts connected by this joint. Adams View connects one part at the I marker to the other at the J marker. |
Extended Definition:
1. Adams View will not allow you to have two joints with the same full name, so you must provide a unique name.
Normally, entity names are composed of alphabetic, numeric, or '_' (underscore) characters, and start with an alphabetic or '_' character. They may be any length. For more information, see
Using Extended Names.
By enclosing the name in double quotes, you may use other printable characters, or start the name with a numeral. If a name contains characters, or starts with a numeral, you must always quote the name when entering it.
Note that you can specify the parentage of an entity (e.g. what part "owns" a marker or a geometry element) when you CREATE it by changing the name. If you enter just the entity name, then the default parent will be assigned by Adams View. If you type in the full name, then you may over ride the default parent. In most cases, when creating an entity, Adams View will provide a default name. The default name that Adams View provides will specify the parentage that it has assumed.
You may, or course, delete this name and use your own. The form of a full name is:
"...._NAME.GRAND_PARENT_NAME.PARENT_NAME.ENTITY_NAME"
The number of levels used varies from case to case and the parentage must exist before an entity can be assigned to it.
2. When you use the FILE ADAMS_DATA_SET WRITE command, Adams View writes an Adams data file for your model. Adams requires that each modeling element be identified by a unique integer identifier. If you use this parameter to specify a non-zero identifier, Adams View will use it in the corresponding statement in the Adams data file.
You may also enter zero as an identifier, either explicitly or by default. The next time you write an Adams file, Adams View will replace the zero with a unique, internally-generated identifier. Adams View will permanently store this identifier with the element just as if you had entered it yourself.
Normally, you would let all identifiers default to zero, and Adams View would generate the identifiers for you. You are never required to enter a non-zero identifier. You only need to specify it if, for some reason, you wish to control the Adams file output.
3. Adams View measures the rotational displacement of the x-axis of the I marker about the common z-axis of the I and the J markers with respect to the x-axis of the J marker.
If you specify ROTATIONAL_IC, but not ANGULAR_VELOCITY_IC, Adams View will set ANGULAR_VELOCITY_IC to zero.
Joint initial conditions impose constraints that are active only during initial conditions analysis (not at the time of the initial configuration). Adams does not impose initial conditions during subsequent analyses.
If you impose initial conditions on the joint that are inconsistent with those on a part in the joint, the initial conditions on the joint have precedence over those on the part. However, if you impose initial conditions on the joint that are inconsistent with imparted motions on the joint, the initial conditions as specified by the motion generator have precedence over those here.
4. Adams View measures the angular velocity of the x-axis of the I marker about the common z-axis of the I and the J markers with respect to the x-axis of the J marker.
If you specify ANGULAR_VELOCITY_IC, but not ROTATIONAL_IC, Adams View will set ROTATIONAL_IC to zero.
Joint initial conditions impose constraints that are active only during initial conditions analysis (not at the time of the initial configuration). Adams does not impose initial conditions during subsequent analyses.
If you impose initial conditions on the joint that are inconsistent with those on a part in the joint, the initial conditions on the joint have precedence over those on the part. However, if you impose initial conditions on the joint that are inconsistent with imparted motions on the joint, the initial conditions as specified by the motion generator have precedence over those here.
5. The I and J markers will be automatically created at this location on the I_PART_NAME and J_PART_NAME respectively.
By default, you supply Cartesian (x, y, z) coordinates. You may use the 'defaults units coordinate_system_type =' command to change this convention. For example, selecting 'cylindrical' means you will subsequently be supplying r, theta, and z coordinates.
Adams View applies your location coordinates in the coordinate system you identify with the RELATIVE_TO parameter. The default for the RELATIVE_TO parameter is the default coordinate system. (See the RELATIVE_TO parameter for this command).
6. The I marker is oriented based on the J marker orientation and the requirements of the particular constraint being created. These markers are created automatically.
Adams View will orient the coordinate system by starting from the initial coordinate system and applying three successive rotations. Depending on the convention you have selected, the rotations may occur about space-fixed or body-fixed axes in any meaningful combination of the x, y, and z axes.
By default, you supply Euler (body313, or body-fixed z, x, z) angles.
You may change this convention with the 'DEFAULTS UNITS ORIENTATION_TYPE=' command. For example, selecting SPACE123 means you will subsequently be supplying space-fixed x, y, and z angles.
Adams View applies your orientation angles starting from the coordinate system you identify with the RELATIVE_TO parameter. The default for the RELATIVE_TO parameter is the default coordinate system.
7. Adams View will assign an arbitrary rotation about the axis.
You may enter either one or two locations to direct the axis. If you enter one location, the axis will point toward the location. If you specify two locations, the axis will be parallel to, and pointing the same way as, the vector from the first location to the second.
Note that this does not completely dictate the orientation of the coordinate system. Adams View will position the coordinate system with an arbitrary rotation about the axis. If you must completely control the coordinate system orientation, use ORIENTATION or IN_PLANE_ORIENTATION.
By default, you direct the Z axis of the coordinate system. You may change this convention with the 'DEFAULTS ORIENT_AXIS_AND_PLANE AXIS_AND_PLANE_SETTING=' command. For example, selecting either X_AXIS_XY_PLANE or X_AXIS_XZ_PLANE means you will subsequently be directing the X axis. The plane-convention setting does not affect this parameter.
Adams View applies your location coordinates in the coordinate system you identify with the RELATIVE_TO parameter. The default for the RELATIVE_TO parameter is the default coordinate system.
8. For the “in_plane_orientation” parameter, you may enter either two or three locations. If you enter two locations, the axis will point toward the first location and the plane will fall on the second. If you specify three locations, the axis will be parallel to, and pointing the same way as, the vector from the first location to the second and the plane will be parallel to the plane defined by the three locations.
By default, you direct the Z axis of the coordinate system and locate the ZX plane. You may use the 'DEFAULTS ORIENT_AXIS_AND_PLANE AXIS_AND_PLANE_SETTING=' command to change this convention. For example, selecting X_AXIS_XY_PLANE means you will subsequently be directing the X axis and locating the XY plane.
Adams View applies your location coordinates in the coordinate system you identify with the RELATIVE_TO parameter. The default for the RELATIVE_TO parameter is the default coordinate system.
9. If the “relative_to” parameter is not specified, the default coordinate system is used. The default coordinate system is initially your model, i.e. the global coordinate system. You may change the default coordinate system using the 'defaults coordinate_system' command.
10. A revolute joint is a single-degree-of-freedom joint that allows rotation of one part with respect to another about a common axis. For a revolute joint, Adams superimposes the origins of the I and J markers and keeps their z-axes parallel and co-directed. Relative motion occurs about the common z-axis. Adams measures the angle of the x-axis of the I marker relative to the x-axis of the J marker to determine the rotational displacement. Adams measures positive rotation according to the right-hand rule.
Cautions:
1. “No_rotational_ic” and “no_angular_velocity_ic” being set to True 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.